./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/subseq-alloca-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 8393723b Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/subseq-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 332083c9703e7f789c3b57b3574f68dffe1c5555ad9f8a0d56f0eaba0a86f436 --- 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-8393723 [2022-11-19 07:51:28,754 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 07:51:28,756 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 07:51:28,791 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 07:51:28,791 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 07:51:28,792 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 07:51:28,794 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 07:51:28,796 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 07:51:28,798 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 07:51:28,799 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 07:51:28,800 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 07:51:28,801 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 07:51:28,802 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 07:51:28,803 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 07:51:28,804 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 07:51:28,805 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 07:51:28,806 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 07:51:28,812 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 07:51:28,814 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 07:51:28,816 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 07:51:28,818 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 07:51:28,824 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 07:51:28,826 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 07:51:28,826 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 07:51:28,830 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 07:51:28,830 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 07:51:28,831 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 07:51:28,831 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 07:51:28,832 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 07:51:28,833 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 07:51:28,833 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 07:51:28,839 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 07:51:28,841 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 07:51:28,842 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 07:51:28,844 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 07:51:28,844 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 07:51:28,845 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 07:51:28,845 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 07:51:28,846 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 07:51:28,846 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 07:51:28,847 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 07:51:28,848 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-11-19 07:51:28,881 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 07:51:28,881 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 07:51:28,882 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 07:51:28,882 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 07:51:28,883 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 07:51:28,883 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 07:51:28,883 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 07:51:28,883 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 07:51:28,884 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 07:51:28,884 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 07:51:28,884 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 07:51:28,884 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 07:51:28,884 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 07:51:28,885 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 07:51:28,885 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 07:51:28,885 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 07:51:28,885 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 07:51:28,886 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 07:51:28,886 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-19 07:51:28,887 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-19 07:51:28,887 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 07:51:28,887 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 07:51:28,887 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-19 07:51:28,887 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 07:51:28,888 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 07:51:28,888 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 07:51:28,888 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-19 07:51:28,888 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-19 07:51:28,888 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-19 07:51:28,889 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 07:51:28,889 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-19 07:51:28,889 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 07:51:28,889 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 07:51:28,890 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 07:51:28,890 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 07:51:28,890 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 07:51:28,890 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 07:51:28,890 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 07:51:28,891 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 07:51:28,891 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 07:51:28,891 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 07:51:28,891 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 07:51:28,892 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_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 332083c9703e7f789c3b57b3574f68dffe1c5555ad9f8a0d56f0eaba0a86f436 [2022-11-19 07:51:29,169 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 07:51:29,199 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 07:51:29,202 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 07:51:29,203 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 07:51:29,204 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 07:51:29,205 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/array-memsafety/subseq-alloca-2.i [2022-11-19 07:51:29,308 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/data/2e406c0d4/c68b622f4b1a4131965645c37e5a6dc7/FLAG71cb1a987 [2022-11-19 07:51:29,871 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 07:51:29,871 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/sv-benchmarks/c/array-memsafety/subseq-alloca-2.i [2022-11-19 07:51:29,888 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/data/2e406c0d4/c68b622f4b1a4131965645c37e5a6dc7/FLAG71cb1a987 [2022-11-19 07:51:30,164 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/data/2e406c0d4/c68b622f4b1a4131965645c37e5a6dc7 [2022-11-19 07:51:30,167 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 07:51:30,170 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 07:51:30,175 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 07:51:30,176 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 07:51:30,180 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 07:51:30,181 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:51:30" (1/1) ... [2022-11-19 07:51:30,183 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d92346e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:30, skipping insertion in model container [2022-11-19 07:51:30,183 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:51:30" (1/1) ... [2022-11-19 07:51:30,191 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 07:51:30,246 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 07:51:30,579 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 07:51:30,600 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 07:51:30,680 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 07:51:30,712 INFO L208 MainTranslator]: Completed translation [2022-11-19 07:51:30,712 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:30 WrapperNode [2022-11-19 07:51:30,713 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 07:51:30,714 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 07:51:30,714 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 07:51:30,714 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 07:51:30,721 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:30" (1/1) ... [2022-11-19 07:51:30,752 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:30" (1/1) ... [2022-11-19 07:51:30,784 INFO L138 Inliner]: procedures = 117, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 96 [2022-11-19 07:51:30,785 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 07:51:30,786 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 07:51:30,786 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 07:51:30,786 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 07:51:30,795 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:30" (1/1) ... [2022-11-19 07:51:30,795 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:30" (1/1) ... [2022-11-19 07:51:30,806 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:30" (1/1) ... [2022-11-19 07:51:30,807 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:30" (1/1) ... [2022-11-19 07:51:30,816 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:30" (1/1) ... [2022-11-19 07:51:30,820 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:30" (1/1) ... [2022-11-19 07:51:30,821 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:30" (1/1) ... [2022-11-19 07:51:30,829 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:30" (1/1) ... [2022-11-19 07:51:30,840 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 07:51:30,841 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 07:51:30,841 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 07:51:30,841 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 07:51:30,842 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:30" (1/1) ... [2022-11-19 07:51:30,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 07:51:30,862 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:51:30,879 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 07:51:30,892 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 07:51:30,924 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-11-19 07:51:30,924 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-19 07:51:30,924 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-19 07:51:30,925 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-19 07:51:30,925 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 07:51:30,925 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 07:51:31,098 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 07:51:31,100 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 07:51:31,385 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 07:51:31,480 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 07:51:31,482 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-19 07:51:31,485 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:51:31 BoogieIcfgContainer [2022-11-19 07:51:31,488 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 07:51:31,490 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 07:51:31,492 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 07:51:31,496 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 07:51:31,496 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 07:51:30" (1/3) ... [2022-11-19 07:51:31,497 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48c45b1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:51:31, skipping insertion in model container [2022-11-19 07:51:31,497 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:51:30" (2/3) ... [2022-11-19 07:51:31,498 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@48c45b1f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:51:31, skipping insertion in model container [2022-11-19 07:51:31,498 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:51:31" (3/3) ... [2022-11-19 07:51:31,500 INFO L112 eAbstractionObserver]: Analyzing ICFG subseq-alloca-2.i [2022-11-19 07:51:31,523 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 07:51:31,524 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 19 error locations. [2022-11-19 07:51:31,597 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 07:51:31,606 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@6094de50, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 07:51:31,606 INFO L358 AbstractCegarLoop]: Starting to check reachability of 19 error locations. [2022-11-19 07:51:31,611 INFO L276 IsEmpty]: Start isEmpty. Operand has 35 states, 15 states have (on average 2.6) internal successors, (39), 34 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:31,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-19 07:51:31,622 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:31,623 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-19 07:51:31,624 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:31,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:31,631 INFO L85 PathProgramCache]: Analyzing trace with hash 158342, now seen corresponding path program 1 times [2022-11-19 07:51:31,642 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:31,643 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [488313161] [2022-11-19 07:51:31,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:31,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:31,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:32,054 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:32,054 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:32,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [488313161] [2022-11-19 07:51:32,055 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [488313161] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:51:32,055 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:51:32,056 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-19 07:51:32,057 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651067852] [2022-11-19 07:51:32,058 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:51:32,064 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 07:51:32,065 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:32,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 07:51:32,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 07:51:32,103 INFO L87 Difference]: Start difference. First operand has 35 states, 15 states have (on average 2.6) internal successors, (39), 34 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:32,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:32,165 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2022-11-19 07:51:32,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 07:51:32,167 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-11-19 07:51:32,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:32,175 INFO L225 Difference]: With dead ends: 33 [2022-11-19 07:51:32,176 INFO L226 Difference]: Without dead ends: 32 [2022-11-19 07:51:32,177 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 07:51:32,181 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 31 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:32,182 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 14 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:51:32,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-19 07:51:32,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-11-19 07:51:32,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 15 states have (on average 2.3333333333333335) internal successors, (35), 31 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:32,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2022-11-19 07:51:32,214 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 3 [2022-11-19 07:51:32,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:32,215 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2022-11-19 07:51:32,215 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:32,215 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2022-11-19 07:51:32,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-11-19 07:51:32,216 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:32,216 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-11-19 07:51:32,216 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-19 07:51:32,216 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:32,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:32,217 INFO L85 PathProgramCache]: Analyzing trace with hash 158343, now seen corresponding path program 1 times [2022-11-19 07:51:32,217 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:32,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [279707792] [2022-11-19 07:51:32,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:32,218 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:32,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:32,507 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:32,507 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:32,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [279707792] [2022-11-19 07:51:32,508 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [279707792] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:51:32,508 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:51:32,508 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-19 07:51:32,508 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385940709] [2022-11-19 07:51:32,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:51:32,510 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 07:51:32,510 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:32,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 07:51:32,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 07:51:32,511 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:32,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:32,632 INFO L93 Difference]: Finished difference Result 62 states and 68 transitions. [2022-11-19 07:51:32,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 07:51:32,633 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2022-11-19 07:51:32,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:32,634 INFO L225 Difference]: With dead ends: 62 [2022-11-19 07:51:32,634 INFO L226 Difference]: Without dead ends: 62 [2022-11-19 07:51:32,635 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-19 07:51:32,636 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 32 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:32,637 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 40 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:51:32,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-11-19 07:51:32,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 34. [2022-11-19 07:51:32,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 17 states have (on average 2.235294117647059) internal successors, (38), 33 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:32,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 38 transitions. [2022-11-19 07:51:32,643 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 38 transitions. Word has length 3 [2022-11-19 07:51:32,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:32,643 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 38 transitions. [2022-11-19 07:51:32,644 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:32,644 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 38 transitions. [2022-11-19 07:51:32,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-19 07:51:32,644 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:32,645 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-19 07:51:32,650 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-19 07:51:32,650 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:32,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:32,655 INFO L85 PathProgramCache]: Analyzing trace with hash 5009085, now seen corresponding path program 1 times [2022-11-19 07:51:32,655 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:32,656 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122765196] [2022-11-19 07:51:32,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:32,656 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:32,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:32,733 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:32,735 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:32,735 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122765196] [2022-11-19 07:51:32,735 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2122765196] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:51:32,735 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:51:32,736 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-19 07:51:32,736 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209925802] [2022-11-19 07:51:32,737 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:51:32,738 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 07:51:32,738 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:32,739 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 07:51:32,739 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 07:51:32,740 INFO L87 Difference]: Start difference. First operand 34 states and 38 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:32,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:32,797 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2022-11-19 07:51:32,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 07:51:32,798 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-19 07:51:32,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:32,799 INFO L225 Difference]: With dead ends: 32 [2022-11-19 07:51:32,799 INFO L226 Difference]: Without dead ends: 32 [2022-11-19 07:51:32,800 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 07:51:32,801 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 28 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:32,801 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 14 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:51:32,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-19 07:51:32,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2022-11-19 07:51:32,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 31 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) [2022-11-19 07:51:32,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 36 transitions. [2022-11-19 07:51:32,813 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 36 transitions. Word has length 4 [2022-11-19 07:51:32,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:32,813 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 36 transitions. [2022-11-19 07:51:32,814 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:32,814 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 36 transitions. [2022-11-19 07:51:32,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-19 07:51:32,814 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:32,814 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-19 07:51:32,815 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-19 07:51:32,815 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:32,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:32,816 INFO L85 PathProgramCache]: Analyzing trace with hash 5009086, now seen corresponding path program 1 times [2022-11-19 07:51:32,816 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:32,816 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [498611482] [2022-11-19 07:51:32,816 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:32,816 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:32,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:33,035 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:33,035 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:33,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [498611482] [2022-11-19 07:51:33,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [498611482] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:51:33,036 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:51:33,036 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 07:51:33,037 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681711379] [2022-11-19 07:51:33,037 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:51:33,037 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 07:51:33,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:33,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 07:51:33,038 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-19 07:51:33,038 INFO L87 Difference]: Start difference. First operand 32 states and 36 transitions. Second operand has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:33,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:33,156 INFO L93 Difference]: Finished difference Result 57 states and 63 transitions. [2022-11-19 07:51:33,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 07:51:33,157 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-19 07:51:33,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:33,158 INFO L225 Difference]: With dead ends: 57 [2022-11-19 07:51:33,158 INFO L226 Difference]: Without dead ends: 57 [2022-11-19 07:51:33,159 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-11-19 07:51:33,160 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 59 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:33,161 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 33 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:51:33,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-11-19 07:51:33,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 34. [2022-11-19 07:51:33,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 33 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:33,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2022-11-19 07:51:33,165 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 4 [2022-11-19 07:51:33,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:33,166 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2022-11-19 07:51:33,166 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:33,166 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2022-11-19 07:51:33,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-19 07:51:33,167 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:33,167 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-19 07:51:33,167 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-19 07:51:33,167 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:33,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:33,168 INFO L85 PathProgramCache]: Analyzing trace with hash 5011637, now seen corresponding path program 1 times [2022-11-19 07:51:33,168 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:33,168 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [430597339] [2022-11-19 07:51:33,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:33,169 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:33,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:33,353 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:33,353 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:33,354 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [430597339] [2022-11-19 07:51:33,354 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [430597339] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:51:33,354 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:51:33,354 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-19 07:51:33,354 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746953362] [2022-11-19 07:51:33,354 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:51:33,355 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 07:51:33,355 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:33,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 07:51:33,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-19 07:51:33,356 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:33,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:33,453 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2022-11-19 07:51:33,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 07:51:33,454 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-19 07:51:33,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:33,454 INFO L225 Difference]: With dead ends: 61 [2022-11-19 07:51:33,454 INFO L226 Difference]: Without dead ends: 61 [2022-11-19 07:51:33,455 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2022-11-19 07:51:33,456 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 30 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:33,456 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 34 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:51:33,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-11-19 07:51:33,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 39. [2022-11-19 07:51:33,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 38 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) [2022-11-19 07:51:33,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2022-11-19 07:51:33,461 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 4 [2022-11-19 07:51:33,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:33,462 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2022-11-19 07:51:33,462 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:33,462 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2022-11-19 07:51:33,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-19 07:51:33,463 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:33,463 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2022-11-19 07:51:33,463 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-19 07:51:33,463 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:33,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:33,464 INFO L85 PathProgramCache]: Analyzing trace with hash 152254852, now seen corresponding path program 1 times [2022-11-19 07:51:33,464 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:33,464 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1146996942] [2022-11-19 07:51:33,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:33,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:33,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:33,772 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:33,773 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:33,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1146996942] [2022-11-19 07:51:33,773 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1146996942] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:51:33,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1243175181] [2022-11-19 07:51:33,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:33,774 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:51:33,774 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:51:33,781 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:51:33,797 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 07:51:33,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:33,855 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-19 07:51:33,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:51:33,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:51:33,985 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 13 [2022-11-19 07:51:34,000 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-19 07:51:34,232 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:34,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:51:34,349 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:34,350 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1243175181] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:51:34,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1385427989] [2022-11-19 07:51:34,368 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2022-11-19 07:51:34,368 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:51:34,373 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:51:34,379 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:51:34,379 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:51:34,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:51:34,468 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:51:34,560 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:51:34,683 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:34,759 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:34,799 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:51:35,160 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '512#(and (not (<= (+ |ULTIMATE.start_main_~nondetString1~0#1.offset| |ULTIMATE.start_main_~i~0#1| 1) (select |#length| |ULTIMATE.start_main_~nondetString1~0#1.base|))) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_#t~nondet15#1| 127) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet15#1|)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-19 07:51:35,160 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:51:35,161 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:51:35,161 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2022-11-19 07:51:35,161 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181000026] [2022-11-19 07:51:35,161 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:51:35,161 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-19 07:51:35,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:35,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-19 07:51:35,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=133, Unknown=0, NotChecked=0, Total=182 [2022-11-19 07:51:35,163 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:35,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:35,526 INFO L93 Difference]: Finished difference Result 87 states and 99 transitions. [2022-11-19 07:51:35,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-19 07:51:35,526 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-19 07:51:35,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:35,527 INFO L225 Difference]: With dead ends: 87 [2022-11-19 07:51:35,527 INFO L226 Difference]: Without dead ends: 87 [2022-11-19 07:51:35,528 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=79, Invalid=193, Unknown=0, NotChecked=0, Total=272 [2022-11-19 07:51:35,528 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 171 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:35,529 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [171 Valid, 88 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:51:35,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-11-19 07:51:35,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 30. [2022-11-19 07:51:35,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 17 states have (on average 2.0) internal successors, (34), 29 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:35,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 34 transitions. [2022-11-19 07:51:35,533 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 34 transitions. Word has length 5 [2022-11-19 07:51:35,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:35,533 INFO L495 AbstractCegarLoop]: Abstraction has 30 states and 34 transitions. [2022-11-19 07:51:35,533 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:35,534 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 34 transitions. [2022-11-19 07:51:35,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-11-19 07:51:35,534 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:35,534 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-11-19 07:51:35,571 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 07:51:35,735 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:51:35,735 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:35,736 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:35,736 INFO L85 PathProgramCache]: Analyzing trace with hash 155360741, now seen corresponding path program 1 times [2022-11-19 07:51:35,736 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:35,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1406282340] [2022-11-19 07:51:35,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:35,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:35,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:35,954 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:35,954 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:35,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1406282340] [2022-11-19 07:51:35,954 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1406282340] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:51:35,955 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:51:35,955 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 07:51:35,955 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585493070] [2022-11-19 07:51:35,955 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:51:35,956 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 07:51:35,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:35,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 07:51:35,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-11-19 07:51:35,957 INFO L87 Difference]: Start difference. First operand 30 states and 34 transitions. Second operand has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:35,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:35,996 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2022-11-19 07:51:35,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 07:51:35,997 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-11-19 07:51:35,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:36,001 INFO L225 Difference]: With dead ends: 29 [2022-11-19 07:51:36,001 INFO L226 Difference]: Without dead ends: 29 [2022-11-19 07:51:36,001 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-11-19 07:51:36,006 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 58 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:36,007 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 11 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:51:36,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-19 07:51:36,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-19 07:51:36,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 17 states have (on average 1.9411764705882353) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:36,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2022-11-19 07:51:36,020 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 5 [2022-11-19 07:51:36,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:36,020 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2022-11-19 07:51:36,020 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:36,025 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2022-11-19 07:51:36,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-19 07:51:36,026 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:36,026 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2022-11-19 07:51:36,026 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-19 07:51:36,027 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:36,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:36,028 INFO L85 PathProgramCache]: Analyzing trace with hash 518833896, now seen corresponding path program 1 times [2022-11-19 07:51:36,028 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:36,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [522194300] [2022-11-19 07:51:36,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:36,031 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:36,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:36,236 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:36,237 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:36,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [522194300] [2022-11-19 07:51:36,237 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [522194300] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:51:36,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [884252150] [2022-11-19 07:51:36,238 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:36,238 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:51:36,238 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:51:36,239 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:51:36,254 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 07:51:36,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:36,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 16 conjunts are in the unsatisfiable core [2022-11-19 07:51:36,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:51:36,367 INFO L321 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-19 07:51:36,368 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 17 [2022-11-19 07:51:36,552 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:36,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:51:36,728 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:36,728 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [884252150] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:51:36,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1167665630] [2022-11-19 07:51:36,747 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-11-19 07:51:36,747 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:51:36,747 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:51:36,748 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:51:36,748 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:51:36,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:51:36,788 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:51:36,869 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:51:36,935 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:36,968 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:36,989 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:51:37,541 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '745#(and (<= 0 (+ 128 |ULTIMATE.start_main_#t~nondet17#1|)) (not (<= (+ |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~i~1#1| 1) (select |#length| |ULTIMATE.start_main_~nondetString2~0#1.base|))) (= |ULTIMATE.start_main_~i~0#1| 0) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= |ULTIMATE.start_main_~length1~0#1| 1) (<= |ULTIMATE.start_main_#t~nondet17#1| 127) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-11-19 07:51:37,541 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:51:37,541 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:51:37,541 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2022-11-19 07:51:37,542 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249525300] [2022-11-19 07:51:37,542 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:51:37,542 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-19 07:51:37,542 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:37,543 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-19 07:51:37,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2022-11-19 07:51:37,543 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:37,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:37,873 INFO L93 Difference]: Finished difference Result 71 states and 78 transitions. [2022-11-19 07:51:37,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-19 07:51:37,874 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-19 07:51:37,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:37,874 INFO L225 Difference]: With dead ends: 71 [2022-11-19 07:51:37,874 INFO L226 Difference]: Without dead ends: 71 [2022-11-19 07:51:37,875 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=102, Invalid=318, Unknown=0, NotChecked=0, Total=420 [2022-11-19 07:51:37,875 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 178 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:37,876 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [178 Valid, 108 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:51:37,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-11-19 07:51:37,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 26. [2022-11-19 07:51:37,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 25 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:37,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2022-11-19 07:51:37,879 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 6 [2022-11-19 07:51:37,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:37,879 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2022-11-19 07:51:37,879 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:37,879 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2022-11-19 07:51:37,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-19 07:51:37,879 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:37,880 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-19 07:51:37,890 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 07:51:38,080 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-19 07:51:38,080 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:38,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:38,081 INFO L85 PathProgramCache]: Analyzing trace with hash 521217537, now seen corresponding path program 1 times [2022-11-19 07:51:38,081 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:38,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119486996] [2022-11-19 07:51:38,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:38,081 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:38,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:38,205 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:38,205 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:38,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119486996] [2022-11-19 07:51:38,205 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1119486996] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:51:38,205 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:51:38,206 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 07:51:38,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853061144] [2022-11-19 07:51:38,206 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:51:38,206 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 07:51:38,206 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:38,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 07:51:38,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-19 07:51:38,208 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:38,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:38,274 INFO L93 Difference]: Finished difference Result 43 states and 47 transitions. [2022-11-19 07:51:38,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 07:51:38,274 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-19 07:51:38,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:38,275 INFO L225 Difference]: With dead ends: 43 [2022-11-19 07:51:38,275 INFO L226 Difference]: Without dead ends: 43 [2022-11-19 07:51:38,275 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-11-19 07:51:38,278 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 106 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 106 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:38,278 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [106 Valid, 20 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:51:38,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-19 07:51:38,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2022-11-19 07:51:38,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 20 states have (on average 2.0) internal successors, (40), 30 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:38,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 40 transitions. [2022-11-19 07:51:38,282 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 40 transitions. Word has length 6 [2022-11-19 07:51:38,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:38,283 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 40 transitions. [2022-11-19 07:51:38,284 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:38,284 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 40 transitions. [2022-11-19 07:51:38,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-19 07:51:38,284 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:38,284 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-19 07:51:38,284 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-19 07:51:38,285 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:38,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:38,285 INFO L85 PathProgramCache]: Analyzing trace with hash 521217536, now seen corresponding path program 1 times [2022-11-19 07:51:38,285 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:38,285 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [963420973] [2022-11-19 07:51:38,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:38,286 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:38,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:38,334 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:38,334 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:38,334 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [963420973] [2022-11-19 07:51:38,335 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [963420973] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:51:38,335 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:51:38,335 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 07:51:38,335 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757377271] [2022-11-19 07:51:38,335 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:51:38,335 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 07:51:38,336 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:38,336 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 07:51:38,336 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 07:51:38,337 INFO L87 Difference]: Start difference. First operand 31 states and 40 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:38,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:38,375 INFO L93 Difference]: Finished difference Result 29 states and 36 transitions. [2022-11-19 07:51:38,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 07:51:38,375 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-19 07:51:38,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:38,376 INFO L225 Difference]: With dead ends: 29 [2022-11-19 07:51:38,376 INFO L226 Difference]: Without dead ends: 29 [2022-11-19 07:51:38,377 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-19 07:51:38,379 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 38 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:38,380 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 12 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:51:38,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-19 07:51:38,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-11-19 07:51:38,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 20 states have (on average 1.8) internal successors, (36), 28 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) [2022-11-19 07:51:38,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 36 transitions. [2022-11-19 07:51:38,383 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 36 transitions. Word has length 6 [2022-11-19 07:51:38,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:38,384 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 36 transitions. [2022-11-19 07:51:38,384 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:38,384 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 36 transitions. [2022-11-19 07:51:38,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-19 07:51:38,384 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:38,385 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:51:38,385 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-11-19 07:51:38,385 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:38,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:38,386 INFO L85 PathProgramCache]: Analyzing trace with hash -1621066503, now seen corresponding path program 1 times [2022-11-19 07:51:38,386 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:38,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1129840603] [2022-11-19 07:51:38,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:38,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:38,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:38,541 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:38,541 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:38,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1129840603] [2022-11-19 07:51:38,542 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1129840603] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:51:38,542 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:51:38,542 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-19 07:51:38,542 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258128779] [2022-11-19 07:51:38,543 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:51:38,543 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 07:51:38,543 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:38,544 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 07:51:38,544 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 07:51:38,545 INFO L87 Difference]: Start difference. First operand 29 states and 36 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:38,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:38,578 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2022-11-19 07:51:38,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 07:51:38,579 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-19 07:51:38,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:38,579 INFO L225 Difference]: With dead ends: 26 [2022-11-19 07:51:38,579 INFO L226 Difference]: Without dead ends: 26 [2022-11-19 07:51:38,580 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-19 07:51:38,580 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 28 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:38,581 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [28 Valid, 11 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:51:38,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-19 07:51:38,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-19 07:51:38,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.6) internal successors, (32), 25 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:38,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2022-11-19 07:51:38,586 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 8 [2022-11-19 07:51:38,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:38,586 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2022-11-19 07:51:38,588 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:38,588 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2022-11-19 07:51:38,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-19 07:51:38,589 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:38,589 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:51:38,589 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-11-19 07:51:38,589 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:38,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:38,590 INFO L85 PathProgramCache]: Analyzing trace with hash -1621066502, now seen corresponding path program 1 times [2022-11-19 07:51:38,590 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:38,590 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [581310004] [2022-11-19 07:51:38,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:38,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:38,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:38,761 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:38,761 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:38,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [581310004] [2022-11-19 07:51:38,761 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [581310004] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:51:38,761 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:51:38,762 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-19 07:51:38,762 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2145507087] [2022-11-19 07:51:38,762 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:51:38,762 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 07:51:38,763 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:38,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 07:51:38,763 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 07:51:38,764 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:38,825 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:38,825 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2022-11-19 07:51:38,825 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 07:51:38,825 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-19 07:51:38,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:38,826 INFO L225 Difference]: With dead ends: 30 [2022-11-19 07:51:38,826 INFO L226 Difference]: Without dead ends: 30 [2022-11-19 07:51:38,826 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-19 07:51:38,827 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 37 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:38,827 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 12 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:51:38,827 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-11-19 07:51:38,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2022-11-19 07:51:38,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.5) internal successors, (33), 27 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:38,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 33 transitions. [2022-11-19 07:51:38,829 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 33 transitions. Word has length 8 [2022-11-19 07:51:38,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:38,829 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 33 transitions. [2022-11-19 07:51:38,829 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:38,830 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 33 transitions. [2022-11-19 07:51:38,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-19 07:51:38,830 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:38,830 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:51:38,830 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-11-19 07:51:38,830 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:38,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:38,831 INFO L85 PathProgramCache]: Analyzing trace with hash 1228409389, now seen corresponding path program 1 times [2022-11-19 07:51:38,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:38,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1472087705] [2022-11-19 07:51:38,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:38,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:38,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:38,938 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:38,938 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:38,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1472087705] [2022-11-19 07:51:38,939 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1472087705] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:51:38,939 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:51:38,939 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-19 07:51:38,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249277856] [2022-11-19 07:51:38,939 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:51:38,939 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-19 07:51:38,939 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:38,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-19 07:51:38,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 07:51:38,940 INFO L87 Difference]: Start difference. First operand 28 states and 33 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 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) [2022-11-19 07:51:38,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:38,965 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2022-11-19 07:51:38,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-19 07:51:38,965 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 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 [2022-11-19 07:51:38,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:38,966 INFO L225 Difference]: With dead ends: 27 [2022-11-19 07:51:38,966 INFO L226 Difference]: Without dead ends: 25 [2022-11-19 07:51:38,966 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-19 07:51:38,967 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 14 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:38,967 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 22 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:51:38,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2022-11-19 07:51:38,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2022-11-19 07:51:38,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.45) internal successors, (29), 24 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:38,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2022-11-19 07:51:38,969 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 10 [2022-11-19 07:51:38,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:38,969 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2022-11-19 07:51:38,969 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 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) [2022-11-19 07:51:38,969 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2022-11-19 07:51:38,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-19 07:51:38,970 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:38,970 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:51:38,970 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-11-19 07:51:38,970 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:38,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:38,970 INFO L85 PathProgramCache]: Analyzing trace with hash -573993678, now seen corresponding path program 1 times [2022-11-19 07:51:38,971 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:38,971 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [91734905] [2022-11-19 07:51:38,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:38,971 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:38,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:38,993 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:38,993 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:38,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [91734905] [2022-11-19 07:51:38,993 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [91734905] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:51:38,993 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:51:38,993 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-19 07:51:38,993 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497784285] [2022-11-19 07:51:38,994 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:51:38,994 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-19 07:51:38,994 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:38,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-19 07:51:38,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 07:51:38,995 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 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) [2022-11-19 07:51:39,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:39,013 INFO L93 Difference]: Finished difference Result 27 states and 30 transitions. [2022-11-19 07:51:39,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-19 07:51:39,013 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-11-19 07:51:39,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:39,014 INFO L225 Difference]: With dead ends: 27 [2022-11-19 07:51:39,014 INFO L226 Difference]: Without dead ends: 26 [2022-11-19 07:51:39,014 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-19 07:51:39,015 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:39,015 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 07:51:39,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-19 07:51:39,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-19 07:51:39,017 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.380952380952381) internal successors, (29), 25 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:39,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2022-11-19 07:51:39,017 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 11 [2022-11-19 07:51:39,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:39,017 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2022-11-19 07:51:39,017 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 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) [2022-11-19 07:51:39,018 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2022-11-19 07:51:39,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-11-19 07:51:39,018 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:39,018 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:51:39,018 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-11-19 07:51:39,019 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:39,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:39,019 INFO L85 PathProgramCache]: Analyzing trace with hash -757155359, now seen corresponding path program 1 times [2022-11-19 07:51:39,019 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:39,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027319037] [2022-11-19 07:51:39,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:39,019 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:39,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:39,279 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:39,279 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:39,279 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1027319037] [2022-11-19 07:51:39,279 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1027319037] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:51:39,280 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 07:51:39,280 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-19 07:51:39,280 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492500558] [2022-11-19 07:51:39,280 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:51:39,280 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-19 07:51:39,280 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:39,281 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-19 07:51:39,281 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-11-19 07:51:39,281 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:39,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:39,414 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2022-11-19 07:51:39,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-19 07:51:39,415 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 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 12 [2022-11-19 07:51:39,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:39,415 INFO L225 Difference]: With dead ends: 34 [2022-11-19 07:51:39,415 INFO L226 Difference]: Without dead ends: 28 [2022-11-19 07:51:39,415 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-11-19 07:51:39,416 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 10 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:39,416 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 53 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:51:39,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-19 07:51:39,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2022-11-19 07:51:39,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 26 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:39,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2022-11-19 07:51:39,418 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 12 [2022-11-19 07:51:39,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:39,418 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2022-11-19 07:51:39,418 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:39,418 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2022-11-19 07:51:39,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-19 07:51:39,419 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:39,419 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:51:39,419 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-11-19 07:51:39,419 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:39,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:39,419 INFO L85 PathProgramCache]: Analyzing trace with hash -2123729020, now seen corresponding path program 1 times [2022-11-19 07:51:39,419 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:39,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1755869653] [2022-11-19 07:51:39,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:39,420 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:39,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:39,666 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:39,666 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:39,666 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1755869653] [2022-11-19 07:51:39,667 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1755869653] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:51:39,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146158002] [2022-11-19 07:51:39,667 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:39,667 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:51:39,667 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:51:39,668 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:51:39,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 07:51:39,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:39,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-19 07:51:39,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:51:39,901 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 30 [2022-11-19 07:51:39,952 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:39,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:51:39,979 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 36 [2022-11-19 07:51:40,036 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 20 treesize of output 16 [2022-11-19 07:51:40,071 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:51:40,071 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [146158002] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:51:40,072 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [531677691] [2022-11-19 07:51:40,074 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-19 07:51:40,074 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:51:40,074 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:51:40,074 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:51:40,074 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:51:40,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:51:40,115 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:51:40,158 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:51:40,211 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:40,244 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:40,297 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:40,337 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:51:40,337 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:51:40,614 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:51:42,566 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [531677691] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 07:51:42,566 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:51:42,566 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [5, 5, 5] total 20 [2022-11-19 07:51:42,567 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637746210] [2022-11-19 07:51:42,567 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 07:51:42,568 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-19 07:51:42,568 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:42,568 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-19 07:51:42,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2022-11-19 07:51:42,569 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand has 11 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:42,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:42,729 INFO L93 Difference]: Finished difference Result 35 states and 38 transitions. [2022-11-19 07:51:42,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-19 07:51:42,730 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 0 states have call successors, (0), 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 [2022-11-19 07:51:42,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:42,730 INFO L225 Difference]: With dead ends: 35 [2022-11-19 07:51:42,730 INFO L226 Difference]: Without dead ends: 29 [2022-11-19 07:51:42,731 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 21 SyntacticMatches, 5 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2022-11-19 07:51:42,731 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 32 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:42,731 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 28 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:51:42,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-11-19 07:51:42,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2022-11-19 07:51:42,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.3478260869565217) internal successors, (31), 27 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:42,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2022-11-19 07:51:42,733 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 14 [2022-11-19 07:51:42,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:42,734 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2022-11-19 07:51:42,734 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 10 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:42,734 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2022-11-19 07:51:42,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-19 07:51:42,734 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:42,734 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:51:42,746 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-19 07:51:42,935 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-19 07:51:42,935 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:42,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:42,935 INFO L85 PathProgramCache]: Analyzing trace with hash 1702111470, now seen corresponding path program 1 times [2022-11-19 07:51:42,936 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:42,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2100858520] [2022-11-19 07:51:42,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:42,936 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:42,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:43,176 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:51:43,176 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:43,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2100858520] [2022-11-19 07:51:43,176 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2100858520] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:51:43,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [196619187] [2022-11-19 07:51:43,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:43,177 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:51:43,177 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:51:43,178 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:51:43,201 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 07:51:43,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:43,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 21 conjunts are in the unsatisfiable core [2022-11-19 07:51:43,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:51:43,406 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 30 [2022-11-19 07:51:43,459 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:51:43,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:51:43,489 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 36 [2022-11-19 07:51:43,595 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 24 treesize of output 18 [2022-11-19 07:51:43,675 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:51:43,675 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [196619187] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:51:43,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [132516455] [2022-11-19 07:51:43,680 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:51:43,680 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:51:43,681 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:51:43,681 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:51:43,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:51:43,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:51:43,719 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:51:43,757 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:51:43,823 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:43,878 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:43,939 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:43,995 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2022-11-19 07:51:44,091 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:44,130 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:44,187 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:44,240 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:51:44,240 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:51:44,861 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:51:46,156 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1573#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (< (select |#length| |ULTIMATE.start_subseq_~ps~0#1.base|) (+ |ULTIMATE.start_subseq_~ps~0#1.offset| 1)) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:51:46,156 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:51:46,156 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:51:46,156 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 6] total 14 [2022-11-19 07:51:46,156 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771485055] [2022-11-19 07:51:46,157 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:51:46,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-19 07:51:46,157 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:46,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-19 07:51:46,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=532, Unknown=0, NotChecked=0, Total=650 [2022-11-19 07:51:46,158 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 16 states, 15 states have (on average 2.8666666666666667) internal successors, (43), 15 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:46,366 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:46,366 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2022-11-19 07:51:46,366 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-19 07:51:46,367 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 2.8666666666666667) internal successors, (43), 15 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-11-19 07:51:46,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:46,367 INFO L225 Difference]: With dead ends: 38 [2022-11-19 07:51:46,367 INFO L226 Difference]: Without dead ends: 38 [2022-11-19 07:51:46,368 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 25 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 280 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=203, Invalid=789, Unknown=0, NotChecked=0, Total=992 [2022-11-19 07:51:46,368 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 187 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 187 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:46,368 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [187 Valid, 21 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:51:46,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2022-11-19 07:51:46,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28. [2022-11-19 07:51:46,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 27 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:46,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2022-11-19 07:51:46,370 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 16 [2022-11-19 07:51:46,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:46,371 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2022-11-19 07:51:46,371 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 2.8666666666666667) internal successors, (43), 15 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:46,371 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2022-11-19 07:51:46,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-19 07:51:46,371 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:46,371 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:51:46,386 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 07:51:46,578 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-19 07:51:46,578 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:46,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:46,578 INFO L85 PathProgramCache]: Analyzing trace with hash -653363033, now seen corresponding path program 1 times [2022-11-19 07:51:46,578 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:46,578 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808510674] [2022-11-19 07:51:46,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:46,579 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:46,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:46,762 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:51:46,763 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:46,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808510674] [2022-11-19 07:51:46,763 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [808510674] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:51:46,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [394272160] [2022-11-19 07:51:46,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:46,764 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:51:46,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:51:46,765 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:51:46,775 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 07:51:46,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:46,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 20 conjunts are in the unsatisfiable core [2022-11-19 07:51:46,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:51:46,946 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:51:46,946 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:51:47,039 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-19 07:51:47,062 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:51:47,062 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [394272160] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:51:47,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1052964744] [2022-11-19 07:51:47,064 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:51:47,065 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:51:47,065 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:51:47,065 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:51:47,066 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:51:47,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:51:47,091 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:51:47,154 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:51:47,201 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:47,237 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:47,277 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:51:47,338 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-19 07:51:47,338 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2022-11-19 07:51:47,395 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:47,422 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:47,527 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-19 07:51:47,527 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-11-19 07:51:47,744 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-19 07:51:47,745 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-19 07:51:51,199 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:51:53,071 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1778#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.offset|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#NULL.offset|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:51:53,071 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:51:53,071 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:51:53,072 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 14 [2022-11-19 07:51:53,072 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1973885952] [2022-11-19 07:51:53,072 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:51:53,072 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-19 07:51:53,072 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:53,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-19 07:51:53,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2022-11-19 07:51:53,073 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 15 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 15 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:53,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:53,222 INFO L93 Difference]: Finished difference Result 36 states and 39 transitions. [2022-11-19 07:51:53,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-19 07:51:53,222 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 15 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2022-11-19 07:51:53,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:53,223 INFO L225 Difference]: With dead ends: 36 [2022-11-19 07:51:53,223 INFO L226 Difference]: Without dead ends: 33 [2022-11-19 07:51:53,223 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 246 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=142, Invalid=670, Unknown=0, NotChecked=0, Total=812 [2022-11-19 07:51:53,224 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 137 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:53,224 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [137 Valid, 49 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:51:53,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-11-19 07:51:53,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 29. [2022-11-19 07:51:53,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 28 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:53,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2022-11-19 07:51:53,227 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 18 [2022-11-19 07:51:53,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:53,227 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2022-11-19 07:51:53,227 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.0714285714285716) internal successors, (43), 15 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:53,227 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2022-11-19 07:51:53,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-19 07:51:53,228 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:53,228 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:51:53,241 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 07:51:53,433 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-19 07:51:53,434 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:53,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:53,434 INFO L85 PathProgramCache]: Analyzing trace with hash 1218254606, now seen corresponding path program 2 times [2022-11-19 07:51:53,434 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:53,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1321081326] [2022-11-19 07:51:53,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:53,435 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:53,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:54,206 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:51:54,207 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:54,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1321081326] [2022-11-19 07:51:54,207 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1321081326] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:51:54,207 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1495948545] [2022-11-19 07:51:54,207 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:51:54,207 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:51:54,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:51:54,208 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:51:54,210 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 07:51:54,309 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 07:51:54,309 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:51:54,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 32 conjunts are in the unsatisfiable core [2022-11-19 07:51:54,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:51:54,330 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-19 07:51:54,330 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-19 07:51:54,508 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-11-19 07:51:54,875 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-19 07:51:54,875 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 17 [2022-11-19 07:51:54,901 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:51:54,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:51:55,080 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 11 [2022-11-19 07:51:55,084 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 22 treesize of output 20 [2022-11-19 07:51:55,432 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:51:55,432 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1495948545] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:51:55,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [77463617] [2022-11-19 07:51:55,434 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:51:55,435 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:51:55,435 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:51:55,435 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:51:55,435 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:51:55,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:51:55,467 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:51:55,500 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:55,539 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:55,561 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:55,616 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:51:55,648 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:55,672 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:55,717 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:51:55,774 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:51:55,774 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:51:56,279 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:51:57,865 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2016#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (< (select |#length| |ULTIMATE.start_subseq_~ps~0#1.base|) (+ |ULTIMATE.start_subseq_~ps~0#1.offset| 1)) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:51:57,865 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:51:57,866 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:51:57,866 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 28 [2022-11-19 07:51:57,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [805445289] [2022-11-19 07:51:57,866 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:51:57,866 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-19 07:51:57,867 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:51:57,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-19 07:51:57,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1336, Unknown=0, NotChecked=0, Total=1482 [2022-11-19 07:51:57,868 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 29 states, 29 states have (on average 2.1379310344827585) internal successors, (62), 28 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) [2022-11-19 07:51:59,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:51:59,120 INFO L93 Difference]: Finished difference Result 80 states and 84 transitions. [2022-11-19 07:51:59,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-19 07:51:59,121 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.1379310344827585) internal successors, (62), 28 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2022-11-19 07:51:59,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:51:59,121 INFO L225 Difference]: With dead ends: 80 [2022-11-19 07:51:59,122 INFO L226 Difference]: Without dead ends: 56 [2022-11-19 07:51:59,124 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1186 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=517, Invalid=3643, Unknown=0, NotChecked=0, Total=4160 [2022-11-19 07:51:59,125 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 110 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 64 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:51:59,125 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 57 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 183 Invalid, 0 Unknown, 64 Unchecked, 0.2s Time] [2022-11-19 07:51:59,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-11-19 07:51:59,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2022-11-19 07:51:59,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 50 states have (on average 1.14) internal successors, (57), 52 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:51:59,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2022-11-19 07:51:59,128 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 22 [2022-11-19 07:51:59,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:51:59,128 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2022-11-19 07:51:59,128 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.1379310344827585) internal successors, (62), 28 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) [2022-11-19 07:51:59,128 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2022-11-19 07:51:59,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-19 07:51:59,129 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:51:59,129 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-19 07:51:59,138 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-19 07:51:59,334 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:51:59,335 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:51:59,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:51:59,335 INFO L85 PathProgramCache]: Analyzing trace with hash -1744756837, now seen corresponding path program 3 times [2022-11-19 07:51:59,335 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:51:59,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283265820] [2022-11-19 07:51:59,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:51:59,336 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:51:59,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:51:59,799 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-19 07:51:59,799 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:51:59,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283265820] [2022-11-19 07:51:59,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [283265820] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:51:59,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1970941180] [2022-11-19 07:51:59,800 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:51:59,800 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:51:59,801 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:51:59,802 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:51:59,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 07:51:59,923 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:51:59,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:51:59,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 17 conjunts are in the unsatisfiable core [2022-11-19 07:51:59,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:52:00,102 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 30 [2022-11-19 07:52:00,156 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-19 07:52:00,157 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:52:00,240 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 36 [2022-11-19 07:52:00,326 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-19 07:52:00,366 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-19 07:52:00,367 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1970941180] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:52:00,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [266911042] [2022-11-19 07:52:00,369 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:52:00,370 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:52:00,370 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:52:00,370 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:52:00,370 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:52:00,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:52:00,406 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:52:00,441 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:00,480 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:00,503 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:00,568 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:00,612 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:00,648 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:00,670 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:00,709 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:00,767 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:52:00,768 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:52:01,363 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:52:02,945 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2384#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (< (select |#length| |ULTIMATE.start_subseq_~ps~0#1.base|) (+ |ULTIMATE.start_subseq_~ps~0#1.offset| 1)) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:52:02,945 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:52:02,945 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:52:02,945 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2022-11-19 07:52:02,945 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140029899] [2022-11-19 07:52:02,946 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:52:02,946 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2022-11-19 07:52:02,946 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:52:02,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2022-11-19 07:52:02,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=805, Unknown=0, NotChecked=0, Total=930 [2022-11-19 07:52:02,947 INFO L87 Difference]: Start difference. First operand 53 states and 57 transitions. Second operand has 21 states, 20 states have (on average 2.9) internal successors, (58), 20 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:52:03,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:52:03,269 INFO L93 Difference]: Finished difference Result 77 states and 81 transitions. [2022-11-19 07:52:03,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-19 07:52:03,269 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 20 states have (on average 2.9) internal successors, (58), 20 states have internal predecessors, (58), 0 states have call successors, (0), 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 26 [2022-11-19 07:52:03,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:52:03,270 INFO L225 Difference]: With dead ends: 77 [2022-11-19 07:52:03,270 INFO L226 Difference]: Without dead ends: 77 [2022-11-19 07:52:03,270 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 50 SyntacticMatches, 5 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 461 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=227, Invalid=1179, Unknown=0, NotChecked=0, Total=1406 [2022-11-19 07:52:03,271 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 196 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 259 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 259 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:52:03,271 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [196 Valid, 96 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 259 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:52:03,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-11-19 07:52:03,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 35. [2022-11-19 07:52:03,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 32 states have (on average 1.15625) 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) [2022-11-19 07:52:03,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-11-19 07:52:03,274 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 26 [2022-11-19 07:52:03,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:52:03,274 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-11-19 07:52:03,275 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 20 states have (on average 2.9) internal successors, (58), 20 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:52:03,275 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-11-19 07:52:03,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-19 07:52:03,275 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:52:03,275 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:52:03,290 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-19 07:52:03,490 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:52:03,490 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:52:03,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:52:03,490 INFO L85 PathProgramCache]: Analyzing trace with hash -2000235599, now seen corresponding path program 2 times [2022-11-19 07:52:03,491 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:52:03,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1113240850] [2022-11-19 07:52:03,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:52:03,491 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:52:03,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:52:03,772 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:52:03,772 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:52:03,772 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1113240850] [2022-11-19 07:52:03,772 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1113240850] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:52:03,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1395787018] [2022-11-19 07:52:03,773 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:52:03,773 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:52:03,773 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:52:03,778 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:52:03,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 07:52:03,894 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-19 07:52:03,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:52:03,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 24 conjunts are in the unsatisfiable core [2022-11-19 07:52:03,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:52:04,017 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:52:04,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:52:04,147 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-19 07:52:04,199 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:52:04,199 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1395787018] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:52:04,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [328269876] [2022-11-19 07:52:04,201 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:52:04,201 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:52:04,202 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:52:04,202 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:52:04,202 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:52:04,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:52:04,227 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:52:04,262 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:52:04,308 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:04,348 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:04,387 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:52:04,445 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-19 07:52:04,446 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2022-11-19 07:52:04,500 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:04,525 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:04,620 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-19 07:52:04,620 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-11-19 07:52:04,779 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-19 07:52:04,779 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-19 07:52:07,156 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:52:09,097 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2690#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.offset|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#NULL.offset|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:52:09,097 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:52:09,098 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:52:09,098 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8] total 19 [2022-11-19 07:52:09,098 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [228449176] [2022-11-19 07:52:09,098 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:52:09,098 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-19 07:52:09,098 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:52:09,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-19 07:52:09,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=744, Unknown=0, NotChecked=0, Total=870 [2022-11-19 07:52:09,099 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 20 states, 19 states have (on average 3.5789473684210527) internal successors, (68), 20 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:52:09,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:52:09,297 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2022-11-19 07:52:09,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-19 07:52:09,297 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 3.5789473684210527) internal successors, (68), 20 states have internal predecessors, (68), 0 states have call successors, (0), 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 26 [2022-11-19 07:52:09,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:52:09,298 INFO L225 Difference]: With dead ends: 42 [2022-11-19 07:52:09,298 INFO L226 Difference]: Without dead ends: 40 [2022-11-19 07:52:09,299 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 357 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=192, Invalid=998, Unknown=0, NotChecked=0, Total=1190 [2022-11-19 07:52:09,299 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 165 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 07:52:09,300 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 56 Invalid, 154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 07:52:09,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-11-19 07:52:09,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 37. [2022-11-19 07:52:09,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 34 states have (on average 1.1470588235294117) internal successors, (39), 36 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:52:09,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2022-11-19 07:52:09,302 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 26 [2022-11-19 07:52:09,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:52:09,302 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2022-11-19 07:52:09,303 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 3.5789473684210527) internal successors, (68), 20 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:52:09,303 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2022-11-19 07:52:09,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-19 07:52:09,303 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:52:09,304 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:52:09,314 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-19 07:52:09,509 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-19 07:52:09,509 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:52:09,510 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:52:09,510 INFO L85 PathProgramCache]: Analyzing trace with hash 1597824280, now seen corresponding path program 4 times [2022-11-19 07:52:09,510 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:52:09,510 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1341104451] [2022-11-19 07:52:09,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:52:09,511 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:52:09,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:52:10,579 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-11-19 07:52:10,579 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:52:10,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1341104451] [2022-11-19 07:52:10,580 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1341104451] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:52:10,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1499314232] [2022-11-19 07:52:10,580 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:52:10,580 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:52:10,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:52:10,581 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:52:10,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-19 07:52:10,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:52:10,705 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 37 conjunts are in the unsatisfiable core [2022-11-19 07:52:10,707 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:52:10,804 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:11,030 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-19 07:52:11,031 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 20 [2022-11-19 07:52:11,053 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 7 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:52:11,053 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:52:11,160 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 07:52:11,163 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 16 treesize of output 12 [2022-11-19 07:52:11,281 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 7 proven. 18 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:52:11,281 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1499314232] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:52:11,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1399286748] [2022-11-19 07:52:11,283 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:52:11,283 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:52:11,283 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:52:11,284 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:52:11,284 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:52:11,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:52:11,320 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:52:11,357 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:52:11,394 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:11,430 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:11,472 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:11,520 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2022-11-19 07:52:11,574 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:11,611 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:11,664 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:11,714 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:52:11,714 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:52:12,159 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:52:13,662 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2991#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (< (select |#length| |ULTIMATE.start_subseq_~ps~0#1.base|) (+ |ULTIMATE.start_subseq_~ps~0#1.offset| 1)) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:52:13,662 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:52:13,662 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:52:13,662 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 28 [2022-11-19 07:52:13,663 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242599366] [2022-11-19 07:52:13,663 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:52:13,663 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-11-19 07:52:13,663 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:52:13,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-11-19 07:52:13,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1283, Unknown=0, NotChecked=0, Total=1406 [2022-11-19 07:52:13,665 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 28 states, 28 states have (on average 2.642857142857143) internal successors, (74), 28 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:52:15,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:52:15,683 INFO L93 Difference]: Finished difference Result 114 states and 118 transitions. [2022-11-19 07:52:15,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-19 07:52:15,684 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.642857142857143) internal successors, (74), 28 states have internal predecessors, (74), 0 states have call successors, (0), 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 30 [2022-11-19 07:52:15,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:52:15,685 INFO L225 Difference]: With dead ends: 114 [2022-11-19 07:52:15,685 INFO L226 Difference]: Without dead ends: 78 [2022-11-19 07:52:15,687 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 64 SyntacticMatches, 3 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 1486 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=526, Invalid=4586, Unknown=0, NotChecked=0, Total=5112 [2022-11-19 07:52:15,688 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 253 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 346 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 253 SdHoareTripleChecker+Valid, 61 SdHoareTripleChecker+Invalid, 522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 346 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 145 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:52:15,688 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [253 Valid, 61 Invalid, 522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 346 Invalid, 0 Unknown, 145 Unchecked, 0.3s Time] [2022-11-19 07:52:15,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-11-19 07:52:15,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 71. [2022-11-19 07:52:15,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 68 states have (on average 1.1323529411764706) internal successors, (77), 70 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:52:15,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 77 transitions. [2022-11-19 07:52:15,691 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 77 transitions. Word has length 30 [2022-11-19 07:52:15,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:52:15,691 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 77 transitions. [2022-11-19 07:52:15,692 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.642857142857143) internal successors, (74), 28 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:52:15,692 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 77 transitions. [2022-11-19 07:52:15,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-19 07:52:15,693 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:52:15,693 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-19 07:52:15,698 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-19 07:52:15,898 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:52:15,898 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:52:15,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:52:15,898 INFO L85 PathProgramCache]: Analyzing trace with hash -674625371, now seen corresponding path program 5 times [2022-11-19 07:52:15,898 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:52:15,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1977113309] [2022-11-19 07:52:15,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:52:15,899 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:52:15,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:52:17,263 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:52:17,264 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:52:17,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1977113309] [2022-11-19 07:52:17,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1977113309] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:52:17,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [439380501] [2022-11-19 07:52:17,264 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:52:17,264 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:52:17,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:52:17,266 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:52:17,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-19 07:52:17,500 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-11-19 07:52:17,500 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:52:17,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-19 07:52:17,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:52:17,540 INFO L321 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-11-19 07:52:17,541 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 17 [2022-11-19 07:52:17,934 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:18,035 INFO L321 Elim1Store]: treesize reduction 39, result has 18.8 percent of original size [2022-11-19 07:52:18,035 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 27 [2022-11-19 07:52:19,785 INFO L321 Elim1Store]: treesize reduction 23, result has 88.7 percent of original size [2022-11-19 07:52:19,786 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 133 treesize of output 263 [2022-11-19 07:52:36,426 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 07:52:36,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:52:37,694 INFO L321 Elim1Store]: treesize reduction 10, result has 9.1 percent of original size [2022-11-19 07:52:37,695 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 364 treesize of output 328 [2022-11-19 07:52:37,778 INFO L321 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2022-11-19 07:52:37,779 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 423 treesize of output 379 [2022-11-19 07:52:37,861 INFO L321 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2022-11-19 07:52:37,862 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 407 treesize of output 363 [2022-11-19 07:52:39,433 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 07:52:39,434 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [439380501] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:52:39,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [519088923] [2022-11-19 07:52:39,436 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:52:39,436 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:52:39,436 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:52:39,436 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:52:39,437 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:52:39,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:52:39,472 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:52:39,509 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:52:39,550 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:39,581 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:39,622 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:39,673 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2022-11-19 07:52:39,718 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:39,753 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:39,789 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:39,845 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:52:39,845 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:52:40,256 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:52:42,112 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3497#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (< (select |#length| |ULTIMATE.start_subseq_~ps~0#1.base|) (+ |ULTIMATE.start_subseq_~ps~0#1.offset| 1)) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:52:42,112 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:52:42,112 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:52:42,112 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13, 13] total 41 [2022-11-19 07:52:42,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34468658] [2022-11-19 07:52:42,112 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:52:42,113 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-19 07:52:42,113 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:52:42,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-19 07:52:42,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=2479, Unknown=0, NotChecked=0, Total=2756 [2022-11-19 07:52:42,114 INFO L87 Difference]: Start difference. First operand 71 states and 77 transitions. Second operand has 43 states, 42 states have (on average 2.261904761904762) internal successors, (95), 42 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:52:46,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:52:46,967 INFO L93 Difference]: Finished difference Result 104 states and 112 transitions. [2022-11-19 07:52:46,968 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-11-19 07:52:46,968 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 2.261904761904762) internal successors, (95), 42 states have internal predecessors, (95), 0 states have call successors, (0), 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 34 [2022-11-19 07:52:46,968 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:52:46,969 INFO L225 Difference]: With dead ends: 104 [2022-11-19 07:52:46,969 INFO L226 Difference]: Without dead ends: 104 [2022-11-19 07:52:46,972 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2566 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=1098, Invalid=7832, Unknown=0, NotChecked=0, Total=8930 [2022-11-19 07:52:46,973 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 100 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 341 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 557 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 341 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 201 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:52:46,973 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 59 Invalid, 557 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 341 Invalid, 0 Unknown, 201 Unchecked, 0.3s Time] [2022-11-19 07:52:46,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2022-11-19 07:52:46,975 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 75. [2022-11-19 07:52:46,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 72 states have (on average 1.125) internal successors, (81), 74 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:52:46,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 81 transitions. [2022-11-19 07:52:46,976 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 81 transitions. Word has length 34 [2022-11-19 07:52:46,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:52:46,977 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 81 transitions. [2022-11-19 07:52:46,977 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 2.261904761904762) internal successors, (95), 42 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:52:46,977 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 81 transitions. [2022-11-19 07:52:46,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-19 07:52:46,978 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:52:46,978 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:52:46,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-19 07:52:47,184 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-19 07:52:47,184 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:52:47,185 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:52:47,185 INFO L85 PathProgramCache]: Analyzing trace with hash -848906949, now seen corresponding path program 3 times [2022-11-19 07:52:47,185 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:52:47,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1115448807] [2022-11-19 07:52:47,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:52:47,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:52:47,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:52:47,545 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 1 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:52:47,545 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:52:47,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1115448807] [2022-11-19 07:52:47,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1115448807] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:52:47,546 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [217699133] [2022-11-19 07:52:47,546 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:52:47,546 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:52:47,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:52:47,547 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:52:47,569 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-19 07:52:47,675 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:52:47,675 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:52:47,677 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 31 conjunts are in the unsatisfiable core [2022-11-19 07:52:47,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:52:47,692 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-19 07:52:47,692 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-19 07:52:47,837 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 4 proven. 32 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:52:47,838 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:52:48,116 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 4 proven. 32 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:52:48,116 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [217699133] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:52:48,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [115141356] [2022-11-19 07:52:48,120 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:52:48,120 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:52:48,120 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:52:48,121 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:52:48,121 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:52:48,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:52:48,144 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:52:48,182 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:52:48,221 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:48,254 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:48,297 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:48,343 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2022-11-19 07:52:48,395 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:48,429 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:48,472 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:48,523 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:52:48,524 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:52:48,986 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:52:50,460 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4001#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:52:50,460 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:52:50,461 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:52:50,461 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 25 [2022-11-19 07:52:50,461 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1520978267] [2022-11-19 07:52:50,461 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:52:50,462 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-19 07:52:50,462 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:52:50,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-19 07:52:50,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=1090, Unknown=0, NotChecked=0, Total=1260 [2022-11-19 07:52:50,463 INFO L87 Difference]: Start difference. First operand 75 states and 81 transitions. Second operand has 26 states, 25 states have (on average 3.36) internal successors, (84), 26 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:52:50,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:52:50,735 INFO L93 Difference]: Finished difference Result 91 states and 98 transitions. [2022-11-19 07:52:50,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-19 07:52:50,736 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 3.36) internal successors, (84), 26 states have internal predecessors, (84), 0 states have call successors, (0), 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 34 [2022-11-19 07:52:50,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:52:50,737 INFO L225 Difference]: With dead ends: 91 [2022-11-19 07:52:50,737 INFO L226 Difference]: Without dead ends: 89 [2022-11-19 07:52:50,737 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=281, Invalid=1441, Unknown=0, NotChecked=0, Total=1722 [2022-11-19 07:52:50,738 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 349 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 349 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:52:50,738 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [349 Valid, 77 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-19 07:52:50,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-11-19 07:52:50,740 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 83. [2022-11-19 07:52:50,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 80 states have (on average 1.1125) internal successors, (89), 82 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:52:50,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 89 transitions. [2022-11-19 07:52:50,741 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 89 transitions. Word has length 34 [2022-11-19 07:52:50,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:52:50,742 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 89 transitions. [2022-11-19 07:52:50,742 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 3.36) internal successors, (84), 26 states have internal predecessors, (84), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:52:50,742 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 89 transitions. [2022-11-19 07:52:50,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-19 07:52:50,743 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:52:50,743 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-19 07:52:50,754 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-19 07:52:50,949 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:52:50,949 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:52:50,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:52:50,950 INFO L85 PathProgramCache]: Analyzing trace with hash 1164185989, now seen corresponding path program 6 times [2022-11-19 07:52:50,950 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:52:50,950 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032949140] [2022-11-19 07:52:50,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:52:50,950 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:52:51,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:52:53,386 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 53 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:52:53,386 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:52:53,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032949140] [2022-11-19 07:52:53,387 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1032949140] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:52:53,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [430278298] [2022-11-19 07:52:53,387 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:52:53,387 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:52:53,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:52:53,388 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:52:53,405 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-19 07:52:53,566 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:52:53,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:52:53,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-19 07:52:53,571 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:52:53,743 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:54,084 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-19 07:52:54,085 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 20 [2022-11-19 07:52:54,117 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 10 proven. 39 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-19 07:52:54,117 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:52:54,308 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 07:52:54,313 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 16 treesize of output 12 [2022-11-19 07:52:54,473 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 10 proven. 39 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-19 07:52:54,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [430278298] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:52:54,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [205194049] [2022-11-19 07:52:54,475 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:52:54,475 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:52:54,475 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:52:54,475 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:52:54,475 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:52:54,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:52:54,512 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:52:54,546 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:52:54,585 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:54,620 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:54,661 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:52:54,716 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-19 07:52:54,717 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2022-11-19 07:52:54,769 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:54,792 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:52:54,902 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-19 07:52:54,903 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-11-19 07:52:55,098 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-19 07:52:55,099 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-19 07:52:57,610 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:52:59,864 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4467#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (< (select |#length| |ULTIMATE.start_subseq_~ps~0#1.base|) (+ |ULTIMATE.start_subseq_~ps~0#1.offset| 1)) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.offset|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:52:59,864 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:52:59,864 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:52:59,864 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13, 13] total 36 [2022-11-19 07:52:59,864 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414986627] [2022-11-19 07:52:59,864 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:52:59,865 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-19 07:52:59,865 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:52:59,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-19 07:52:59,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=1924, Unknown=0, NotChecked=0, Total=2070 [2022-11-19 07:52:59,866 INFO L87 Difference]: Start difference. First operand 83 states and 89 transitions. Second operand has 36 states, 36 states have (on average 2.861111111111111) internal successors, (103), 36 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:53:03,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:53:03,930 INFO L93 Difference]: Finished difference Result 201 states and 209 transitions. [2022-11-19 07:53:03,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-11-19 07:53:03,931 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.861111111111111) internal successors, (103), 36 states have internal predecessors, (103), 0 states have call successors, (0), 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 [2022-11-19 07:53:03,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:53:03,932 INFO L225 Difference]: With dead ends: 201 [2022-11-19 07:53:03,932 INFO L226 Difference]: Without dead ends: 129 [2022-11-19 07:53:03,934 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 91 SyntacticMatches, 10 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 4 DeprecatedPredicates, 2994 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=608, Invalid=8322, Unknown=0, NotChecked=0, Total=8930 [2022-11-19 07:53:03,935 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 144 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 820 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 144 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 1098 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 820 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 239 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:53:03,935 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [144 Valid, 270 Invalid, 1098 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 820 Invalid, 0 Unknown, 239 Unchecked, 0.7s Time] [2022-11-19 07:53:03,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2022-11-19 07:53:03,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 125. [2022-11-19 07:53:03,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 122 states have (on average 1.0901639344262295) internal successors, (133), 124 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:53:03,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 133 transitions. [2022-11-19 07:53:03,940 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 133 transitions. Word has length 40 [2022-11-19 07:53:03,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:53:03,941 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 133 transitions. [2022-11-19 07:53:03,941 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.861111111111111) internal successors, (103), 36 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:53:03,941 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 133 transitions. [2022-11-19 07:53:03,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-11-19 07:53:03,942 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:53:03,943 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:53:03,950 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-11-19 07:53:04,148 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-11-19 07:53:04,148 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:53:04,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:53:04,149 INFO L85 PathProgramCache]: Analyzing trace with hash -1241957051, now seen corresponding path program 4 times [2022-11-19 07:53:04,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:53:04,150 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2046458866] [2022-11-19 07:53:04,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:53:04,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:53:04,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:53:04,582 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 4 proven. 60 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:53:04,582 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:53:04,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2046458866] [2022-11-19 07:53:04,582 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2046458866] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:53:04,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1924835753] [2022-11-19 07:53:04,582 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:53:04,582 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:53:04,583 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:53:04,584 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:53:04,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-19 07:53:04,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:53:04,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 35 conjunts are in the unsatisfiable core [2022-11-19 07:53:04,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:53:04,934 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:53:04,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:53:05,165 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-19 07:53:05,235 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 9 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:53:05,235 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1924835753] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:53:05,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1746552738] [2022-11-19 07:53:05,237 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:53:05,237 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:53:05,237 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:53:05,237 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:53:05,238 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:53:05,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:53:05,268 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:53:05,299 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:53:05,338 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:05,376 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:05,413 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:05,458 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2022-11-19 07:53:05,509 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:05,544 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:05,585 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:05,635 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:53:05,635 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:53:06,171 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:53:07,641 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5183#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:53:07,641 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:53:07,641 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:53:07,641 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 25 [2022-11-19 07:53:07,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81557217] [2022-11-19 07:53:07,641 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:53:07,642 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-11-19 07:53:07,642 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:53:07,642 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-11-19 07:53:07,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1099, Unknown=0, NotChecked=0, Total=1260 [2022-11-19 07:53:07,643 INFO L87 Difference]: Start difference. First operand 125 states and 133 transitions. Second operand has 26 states, 25 states have (on average 3.64) internal successors, (91), 26 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) [2022-11-19 07:53:08,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:53:08,037 INFO L93 Difference]: Finished difference Result 146 states and 155 transitions. [2022-11-19 07:53:08,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-19 07:53:08,038 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 25 states have (on average 3.64) internal successors, (91), 26 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) Word has length 42 [2022-11-19 07:53:08,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:53:08,039 INFO L225 Difference]: With dead ends: 146 [2022-11-19 07:53:08,039 INFO L226 Difference]: Without dead ends: 144 [2022-11-19 07:53:08,039 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 96 SyntacticMatches, 5 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 583 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=280, Invalid=1526, Unknown=0, NotChecked=0, Total=1806 [2022-11-19 07:53:08,040 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 130 mSDsluCounter, 124 mSDsCounter, 0 mSdLazyCounter, 437 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 140 SdHoareTripleChecker+Invalid, 447 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 437 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:53:08,040 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 140 Invalid, 447 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 437 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:53:08,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2022-11-19 07:53:08,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 137. [2022-11-19 07:53:08,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 134 states have (on average 1.0895522388059702) internal successors, (146), 136 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:53:08,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 146 transitions. [2022-11-19 07:53:08,043 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 146 transitions. Word has length 42 [2022-11-19 07:53:08,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:53:08,044 INFO L495 AbstractCegarLoop]: Abstraction has 137 states and 146 transitions. [2022-11-19 07:53:08,044 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 25 states have (on average 3.64) internal successors, (91), 26 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) [2022-11-19 07:53:08,044 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 146 transitions. [2022-11-19 07:53:08,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-11-19 07:53:08,050 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:53:08,051 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1] [2022-11-19 07:53:08,058 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-19 07:53:08,251 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-19 07:53:08,251 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:53:08,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:53:08,252 INFO L85 PathProgramCache]: Analyzing trace with hash 2145040018, now seen corresponding path program 7 times [2022-11-19 07:53:08,252 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:53:08,252 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1014808611] [2022-11-19 07:53:08,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:53:08,252 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:53:08,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:53:09,996 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-19 07:53:09,997 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:53:09,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1014808611] [2022-11-19 07:53:09,997 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1014808611] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:53:09,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [6074044] [2022-11-19 07:53:09,997 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:53:09,997 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:53:09,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:53:09,998 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:53:10,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-19 07:53:10,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:53:10,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 44 conjunts are in the unsatisfiable core [2022-11-19 07:53:10,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:53:10,150 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2022-11-19 07:53:10,300 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:10,354 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 19 [2022-11-19 07:53:11,503 INFO L321 Elim1Store]: treesize reduction 3, result has 92.7 percent of original size [2022-11-19 07:53:11,504 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 65 treesize of output 75 [2022-11-19 07:53:11,725 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 4 proven. 45 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-19 07:53:11,725 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:53:13,659 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-19 07:53:13,659 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 64 treesize of output 42 [2022-11-19 07:53:13,690 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-19 07:53:13,690 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 111 treesize of output 120 [2022-11-19 07:53:13,714 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-19 07:53:13,714 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 68 treesize of output 64 [2022-11-19 07:53:13,724 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 24 treesize of output 18 [2022-11-19 07:53:14,186 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 4 proven. 45 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-19 07:53:14,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [6074044] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:53:14,187 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1756000524] [2022-11-19 07:53:14,188 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:53:14,188 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:53:14,189 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:53:14,189 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:53:14,189 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:53:14,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:53:14,228 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:53:14,257 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:14,293 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:14,314 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:14,383 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:14,430 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:14,465 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:14,486 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:14,522 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:14,582 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:53:14,582 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:53:15,001 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:53:16,628 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5794#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (< (select |#length| |ULTIMATE.start_subseq_~ps~0#1.base|) (+ |ULTIMATE.start_subseq_~ps~0#1.offset| 1)) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:53:16,628 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:53:16,629 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:53:16,629 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 14, 14] total 44 [2022-11-19 07:53:16,629 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [693296112] [2022-11-19 07:53:16,629 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:53:16,629 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-11-19 07:53:16,630 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:53:16,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-11-19 07:53:16,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=2795, Unknown=0, NotChecked=0, Total=3080 [2022-11-19 07:53:16,631 INFO L87 Difference]: Start difference. First operand 137 states and 146 transitions. Second operand has 46 states, 45 states have (on average 2.6222222222222222) internal successors, (118), 45 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) [2022-11-19 07:53:35,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:53:35,449 INFO L93 Difference]: Finished difference Result 169 states and 177 transitions. [2022-11-19 07:53:35,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-19 07:53:35,450 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 45 states have (on average 2.6222222222222222) internal successors, (118), 45 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 44 [2022-11-19 07:53:35,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:53:35,451 INFO L225 Difference]: With dead ends: 169 [2022-11-19 07:53:35,451 INFO L226 Difference]: Without dead ends: 169 [2022-11-19 07:53:35,453 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 95 SyntacticMatches, 4 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2327 ImplicationChecksByTransitivity, 22.1s TimeCoverageRelationStatistics Valid=891, Invalid=6587, Unknown=4, NotChecked=0, Total=7482 [2022-11-19 07:53:35,453 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 167 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 463 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 164 SdHoareTripleChecker+Invalid, 631 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 463 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 154 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:53:35,453 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [167 Valid, 164 Invalid, 631 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 463 Invalid, 0 Unknown, 154 Unchecked, 0.3s Time] [2022-11-19 07:53:35,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2022-11-19 07:53:35,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 99. [2022-11-19 07:53:35,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 96 states have (on average 1.09375) internal successors, (105), 98 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:53:35,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 105 transitions. [2022-11-19 07:53:35,457 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 105 transitions. Word has length 44 [2022-11-19 07:53:35,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:53:35,457 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 105 transitions. [2022-11-19 07:53:35,457 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 45 states have (on average 2.6222222222222222) internal successors, (118), 45 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) [2022-11-19 07:53:35,458 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 105 transitions. [2022-11-19 07:53:35,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-19 07:53:35,458 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:53:35,458 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-19 07:53:35,466 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-11-19 07:53:35,664 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-19 07:53:35,664 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:53:35,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:53:35,664 INFO L85 PathProgramCache]: Analyzing trace with hash 1083634063, now seen corresponding path program 8 times [2022-11-19 07:53:35,665 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:53:35,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847610936] [2022-11-19 07:53:35,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:53:35,665 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:53:35,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:53:38,737 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:53:38,737 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:53:38,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847610936] [2022-11-19 07:53:38,737 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1847610936] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:53:38,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2009701229] [2022-11-19 07:53:38,737 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:53:38,738 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:53:38,738 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:53:38,738 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:53:38,742 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-19 07:53:38,917 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-19 07:53:38,917 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:53:38,920 INFO L263 TraceCheckSpWp]: Trace formula consists of 328 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-19 07:53:38,923 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:53:38,932 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 18 treesize of output 16 [2022-11-19 07:53:38,940 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2022-11-19 07:53:39,156 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 13 [2022-11-19 07:53:39,253 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2022-11-19 07:53:40,313 INFO L321 Elim1Store]: treesize reduction 3, result has 93.6 percent of original size [2022-11-19 07:53:40,313 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 68 treesize of output 81 [2022-11-19 07:53:40,535 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 12 proven. 7 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2022-11-19 07:53:40,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:53:42,692 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-19 07:53:42,692 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 64 treesize of output 42 [2022-11-19 07:53:42,717 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-19 07:53:42,717 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 111 treesize of output 120 [2022-11-19 07:53:42,733 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-19 07:53:42,733 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 68 treesize of output 64 [2022-11-19 07:53:43,230 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 2 proven. 65 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-19 07:53:43,231 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2009701229] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:53:43,231 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1851826272] [2022-11-19 07:53:43,232 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:53:43,233 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:53:43,233 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:53:43,233 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:53:43,233 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:53:43,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:53:43,265 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:53:43,297 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:53:43,331 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:43,363 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:43,418 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:43,458 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2022-11-19 07:53:43,499 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:43,530 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:43,569 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:43,622 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:53:43,622 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:53:43,975 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:53:45,731 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6463#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (< (select |#length| |ULTIMATE.start_subseq_~ps~0#1.base|) (+ |ULTIMATE.start_subseq_~ps~0#1.offset| 1)) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:53:45,731 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:53:45,731 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:53:45,731 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 8, 12] total 40 [2022-11-19 07:53:45,731 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1542757714] [2022-11-19 07:53:45,731 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:53:45,732 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-19 07:53:45,732 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:53:45,732 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-19 07:53:45,733 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=2383, Unknown=4, NotChecked=0, Total=2652 [2022-11-19 07:53:45,734 INFO L87 Difference]: Start difference. First operand 99 states and 105 transitions. Second operand has 42 states, 41 states have (on average 2.658536585365854) internal successors, (109), 41 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:53:49,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:53:49,353 INFO L93 Difference]: Finished difference Result 130 states and 138 transitions. [2022-11-19 07:53:49,358 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-19 07:53:49,358 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 2.658536585365854) internal successors, (109), 41 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-11-19 07:53:49,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:53:49,359 INFO L225 Difference]: With dead ends: 130 [2022-11-19 07:53:49,359 INFO L226 Difference]: Without dead ends: 130 [2022-11-19 07:53:49,360 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 115 SyntacticMatches, 5 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1998 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=937, Invalid=6199, Unknown=4, NotChecked=0, Total=7140 [2022-11-19 07:53:49,361 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 57 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 256 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 385 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 256 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 122 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:53:49,361 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 70 Invalid, 385 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 256 Invalid, 0 Unknown, 122 Unchecked, 0.2s Time] [2022-11-19 07:53:49,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2022-11-19 07:53:49,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 52. [2022-11-19 07:53:49,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 50 states have (on average 1.08) internal successors, (54), 51 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:53:49,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2022-11-19 07:53:49,364 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 48 [2022-11-19 07:53:49,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:53:49,364 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2022-11-19 07:53:49,364 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 41 states have (on average 2.658536585365854) internal successors, (109), 41 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:53:49,364 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2022-11-19 07:53:49,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-11-19 07:53:49,365 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:53:49,365 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:53:49,371 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-19 07:53:49,571 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-19 07:53:49,571 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:53:49,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:53:49,571 INFO L85 PathProgramCache]: Analyzing trace with hash -2037074715, now seen corresponding path program 5 times [2022-11-19 07:53:49,572 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:53:49,572 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1606586002] [2022-11-19 07:53:49,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:53:49,572 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:53:49,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:53:50,130 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 23 proven. 68 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:53:50,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:53:50,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1606586002] [2022-11-19 07:53:50,131 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1606586002] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:53:50,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1978475475] [2022-11-19 07:53:50,131 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:53:50,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:53:50,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:53:50,132 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:53:50,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-19 07:53:50,439 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-11-19 07:53:50,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:53:50,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 49 conjunts are in the unsatisfiable core [2022-11-19 07:53:50,443 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:53:50,566 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:50,691 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 23 proven. 68 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:53:50,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:53:50,755 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 07:53:50,756 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 16 treesize of output 12 [2022-11-19 07:53:50,860 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 23 proven. 68 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:53:50,860 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1978475475] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:53:50,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [986210189] [2022-11-19 07:53:50,862 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:53:50,862 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:53:50,862 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:53:50,862 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:53:50,862 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:53:50,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:53:50,898 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:53:50,922 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:53:50,962 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:50,990 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:51,028 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:51,067 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2022-11-19 07:53:51,112 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:51,154 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:51,190 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:51,234 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:53:51,234 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:53:51,632 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:53:53,196 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7036#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:53:53,196 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:53:53,196 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:53:53,196 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 27 [2022-11-19 07:53:53,196 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796840485] [2022-11-19 07:53:53,196 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:53:53,197 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-19 07:53:53,197 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:53:53,197 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-19 07:53:53,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=1199, Unknown=0, NotChecked=0, Total=1332 [2022-11-19 07:53:53,198 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand has 27 states, 27 states have (on average 2.925925925925926) internal successors, (79), 27 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:53:53,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:53:53,821 INFO L93 Difference]: Finished difference Result 85 states and 87 transitions. [2022-11-19 07:53:53,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-11-19 07:53:53,822 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.925925925925926) internal successors, (79), 27 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-11-19 07:53:53,822 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:53:53,823 INFO L225 Difference]: With dead ends: 85 [2022-11-19 07:53:53,823 INFO L226 Difference]: Without dead ends: 55 [2022-11-19 07:53:53,823 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 119 SyntacticMatches, 3 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=264, Invalid=2186, Unknown=0, NotChecked=0, Total=2450 [2022-11-19 07:53:53,824 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 157 mSDsluCounter, 160 mSDsCounter, 0 mSdLazyCounter, 444 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 491 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 444 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 39 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:53:53,824 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [157 Valid, 174 Invalid, 491 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 444 Invalid, 0 Unknown, 39 Unchecked, 0.3s Time] [2022-11-19 07:53:53,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-11-19 07:53:53,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2022-11-19 07:53:53,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 52 states have (on average 1.0769230769230769) internal successors, (56), 53 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:53:53,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2022-11-19 07:53:53,826 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 48 [2022-11-19 07:53:53,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:53:53,826 INFO L495 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2022-11-19 07:53:53,826 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.925925925925926) internal successors, (79), 27 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:53:53,826 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2022-11-19 07:53:53,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-19 07:53:53,827 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:53:53,827 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:53:53,841 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-19 07:53:54,027 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-19 07:53:54,028 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:53:54,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:53:54,028 INFO L85 PathProgramCache]: Analyzing trace with hash -1699640369, now seen corresponding path program 6 times [2022-11-19 07:53:54,028 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:53:54,028 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1093022037] [2022-11-19 07:53:54,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:53:54,028 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:53:54,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:53:54,645 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 9 proven. 91 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:53:54,645 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:53:54,645 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1093022037] [2022-11-19 07:53:54,645 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1093022037] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:53:54,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1408901036] [2022-11-19 07:53:54,646 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:53:54,646 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:53:54,646 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:53:54,647 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:53:54,678 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-19 07:53:54,822 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:53:54,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:53:54,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-19 07:53:54,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:53:54,842 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-19 07:53:54,843 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-19 07:53:55,119 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 16 proven. 84 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:53:55,119 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:53:55,591 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 16 proven. 84 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:53:55,591 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1408901036] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:53:55,591 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [861987709] [2022-11-19 07:53:55,593 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:53:55,593 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:53:55,593 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:53:55,593 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:53:55,593 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:53:55,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:53:55,632 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:53:55,662 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:53:55,701 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:55,727 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:55,767 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:53:55,825 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-19 07:53:55,825 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2022-11-19 07:53:55,874 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:55,907 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:53:55,994 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-19 07:53:55,995 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-11-19 07:53:56,140 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-19 07:53:56,141 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-19 07:53:58,284 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:54:00,463 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7541#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.offset|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#NULL.offset|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:54:00,464 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:54:00,464 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:54:00,464 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 14] total 35 [2022-11-19 07:54:00,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386148925] [2022-11-19 07:54:00,464 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:54:00,465 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-19 07:54:00,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:54:00,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-19 07:54:00,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=1834, Unknown=0, NotChecked=0, Total=2070 [2022-11-19 07:54:00,470 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand has 36 states, 35 states have (on average 3.4285714285714284) internal successors, (120), 36 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:01,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:54:01,021 INFO L93 Difference]: Finished difference Result 65 states and 67 transitions. [2022-11-19 07:54:01,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-19 07:54:01,022 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 3.4285714285714284) internal successors, (120), 36 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2022-11-19 07:54:01,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:54:01,022 INFO L225 Difference]: With dead ends: 65 [2022-11-19 07:54:01,023 INFO L226 Difference]: Without dead ends: 63 [2022-11-19 07:54:01,023 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 893 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=440, Invalid=2422, Unknown=0, NotChecked=0, Total=2862 [2022-11-19 07:54:01,024 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 551 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 423 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 551 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 430 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 423 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:54:01,024 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [551 Valid, 135 Invalid, 430 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 423 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:54:01,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-11-19 07:54:01,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2022-11-19 07:54:01,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 58 states have (on average 1.0689655172413792) 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) [2022-11-19 07:54:01,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2022-11-19 07:54:01,026 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 50 [2022-11-19 07:54:01,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:54:01,026 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2022-11-19 07:54:01,027 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 3.4285714285714284) internal successors, (120), 36 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:01,027 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2022-11-19 07:54:01,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-11-19 07:54:01,027 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:54:01,027 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:54:01,033 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-19 07:54:01,228 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:54:01,228 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:54:01,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:54:01,229 INFO L85 PathProgramCache]: Analyzing trace with hash -1418300433, now seen corresponding path program 7 times [2022-11-19 07:54:01,229 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:54:01,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056592046] [2022-11-19 07:54:01,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:54:01,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:54:01,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:54:01,892 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 28 proven. 105 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:01,892 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:54:01,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1056592046] [2022-11-19 07:54:01,892 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1056592046] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:54:01,892 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1159052053] [2022-11-19 07:54:01,893 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:54:01,893 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:54:01,893 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:54:01,894 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:54:01,896 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-19 07:54:02,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:54:02,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 367 conjuncts, 55 conjunts are in the unsatisfiable core [2022-11-19 07:54:02,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:54:02,191 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:02,320 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 28 proven. 105 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:02,321 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:54:02,400 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 07:54:02,402 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 16 treesize of output 12 [2022-11-19 07:54:02,516 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 28 proven. 105 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:02,516 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1159052053] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:54:02,516 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [865650203] [2022-11-19 07:54:02,517 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:54:02,517 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:54:02,518 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:54:02,518 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:54:02,518 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:54:02,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:54:02,549 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:54:02,586 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:02,623 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:02,643 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:02,697 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:02,727 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:02,765 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:02,783 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:02,821 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:02,874 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:54:02,874 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:54:03,272 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:54:05,535 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8052#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:54:05,535 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:54:05,535 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:54:05,536 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 30 [2022-11-19 07:54:05,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599472000] [2022-11-19 07:54:05,536 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:54:05,536 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-19 07:54:05,536 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:54:05,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-19 07:54:05,537 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1419, Unknown=0, NotChecked=0, Total=1560 [2022-11-19 07:54:05,537 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand has 30 states, 30 states have (on average 2.966666666666667) internal successors, (89), 30 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:06,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:54:06,337 INFO L93 Difference]: Finished difference Result 99 states and 101 transitions. [2022-11-19 07:54:06,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-19 07:54:06,339 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.966666666666667) internal successors, (89), 30 states have internal predecessors, (89), 0 states have call successors, (0), 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 56 [2022-11-19 07:54:06,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:54:06,339 INFO L225 Difference]: With dead ends: 99 [2022-11-19 07:54:06,339 INFO L226 Difference]: Without dead ends: 63 [2022-11-19 07:54:06,340 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 136 SyntacticMatches, 9 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 802 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=291, Invalid=2679, Unknown=0, NotChecked=0, Total=2970 [2022-11-19 07:54:06,340 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 103 mSDsluCounter, 241 mSDsCounter, 0 mSdLazyCounter, 691 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 742 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 691 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 42 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:54:06,340 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 257 Invalid, 742 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 691 Invalid, 0 Unknown, 42 Unchecked, 0.4s Time] [2022-11-19 07:54:06,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-11-19 07:54:06,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2022-11-19 07:54:06,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 60 states have (on average 1.0666666666666667) internal successors, (64), 61 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:06,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2022-11-19 07:54:06,342 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 56 [2022-11-19 07:54:06,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:54:06,343 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2022-11-19 07:54:06,343 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.966666666666667) internal successors, (89), 30 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:06,343 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2022-11-19 07:54:06,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-11-19 07:54:06,343 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:54:06,344 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:54:06,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-19 07:54:06,558 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:54:06,558 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:54:06,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:54:06,559 INFO L85 PathProgramCache]: Analyzing trace with hash -1628782375, now seen corresponding path program 8 times [2022-11-19 07:54:06,559 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:54:06,559 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [317403129] [2022-11-19 07:54:06,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:54:06,559 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:54:06,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:54:07,243 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 16 proven. 128 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:07,243 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:54:07,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [317403129] [2022-11-19 07:54:07,244 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [317403129] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:54:07,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [568101401] [2022-11-19 07:54:07,244 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:54:07,244 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:54:07,244 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:54:07,245 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:54:07,250 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-19 07:54:07,459 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-19 07:54:07,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:54:07,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-19 07:54:07,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:54:07,828 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 25 proven. 119 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:07,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:54:08,189 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-19 07:54:08,307 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 25 proven. 119 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:08,307 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [568101401] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:54:08,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [368184116] [2022-11-19 07:54:08,308 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:54:08,308 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:54:08,309 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:54:08,309 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:54:08,309 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:54:08,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:54:08,338 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:54:08,369 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:54:08,403 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:08,439 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:08,474 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:08,514 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2022-11-19 07:54:08,559 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:08,598 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:08,632 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:08,682 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:54:08,682 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:54:09,019 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:54:10,579 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8635#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:54:10,579 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:54:10,579 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:54:10,580 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 39 [2022-11-19 07:54:10,580 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1637016130] [2022-11-19 07:54:10,580 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:54:10,580 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-11-19 07:54:10,580 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:54:10,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-11-19 07:54:10,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=2145, Unknown=0, NotChecked=0, Total=2450 [2022-11-19 07:54:10,581 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand has 40 states, 39 states have (on average 4.0) internal successors, (156), 40 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:11,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:54:11,190 INFO L93 Difference]: Finished difference Result 73 states and 75 transitions. [2022-11-19 07:54:11,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-19 07:54:11,191 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 4.0) internal successors, (156), 40 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2022-11-19 07:54:11,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:54:11,192 INFO L225 Difference]: With dead ends: 73 [2022-11-19 07:54:11,192 INFO L226 Difference]: Without dead ends: 71 [2022-11-19 07:54:11,193 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 132 SyntacticMatches, 7 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1322 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=539, Invalid=2883, Unknown=0, NotChecked=0, Total=3422 [2022-11-19 07:54:11,193 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 578 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 588 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 578 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 603 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 588 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:54:11,193 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [578 Valid, 178 Invalid, 603 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 588 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 07:54:11,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-11-19 07:54:11,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2022-11-19 07:54:11,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 66 states have (on average 1.0606060606060606) internal successors, (70), 67 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:11,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2022-11-19 07:54:11,196 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 58 [2022-11-19 07:54:11,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:54:11,196 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2022-11-19 07:54:11,196 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 39 states have (on average 4.0) internal successors, (156), 40 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:11,197 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2022-11-19 07:54:11,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2022-11-19 07:54:11,197 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:54:11,197 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:54:11,203 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-19 07:54:11,403 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:54:11,403 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:54:11,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:54:11,403 INFO L85 PathProgramCache]: Analyzing trace with hash -1674430087, now seen corresponding path program 9 times [2022-11-19 07:54:11,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:54:11,404 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603515826] [2022-11-19 07:54:11,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:54:11,404 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:54:11,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:54:12,226 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 33 proven. 150 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:12,226 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:54:12,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603515826] [2022-11-19 07:54:12,227 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1603515826] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:54:12,227 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [342929496] [2022-11-19 07:54:12,227 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:54:12,227 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:54:12,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:54:12,230 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:54:12,253 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-19 07:54:12,428 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:54:12,428 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:54:12,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 411 conjuncts, 59 conjunts are in the unsatisfiable core [2022-11-19 07:54:12,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:54:12,627 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:12,777 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 33 proven. 150 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:12,777 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:54:12,863 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 07:54:12,865 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 16 treesize of output 12 [2022-11-19 07:54:12,990 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 33 proven. 150 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:12,990 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [342929496] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:54:12,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2083905397] [2022-11-19 07:54:12,992 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:54:12,992 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:54:12,992 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:54:12,992 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:54:12,992 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:54:13,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:54:13,027 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:54:13,058 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:54:13,102 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:13,134 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:13,173 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:54:13,224 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-19 07:54:13,225 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2022-11-19 07:54:13,268 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:13,287 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:13,374 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-19 07:54:13,374 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-11-19 07:54:13,520 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-19 07:54:13,521 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-19 07:54:15,016 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:54:17,278 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9215#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:54:17,278 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:54:17,278 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:54:17,279 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 33 [2022-11-19 07:54:17,279 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776347028] [2022-11-19 07:54:17,279 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:54:17,279 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-19 07:54:17,279 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:54:17,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-19 07:54:17,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=1662, Unknown=0, NotChecked=0, Total=1806 [2022-11-19 07:54:17,280 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand has 33 states, 33 states have (on average 3.0) internal successors, (99), 33 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:18,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:54:18,257 INFO L93 Difference]: Finished difference Result 113 states and 115 transitions. [2022-11-19 07:54:18,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-19 07:54:18,258 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.0) internal successors, (99), 33 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 64 [2022-11-19 07:54:18,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:54:18,259 INFO L225 Difference]: With dead ends: 113 [2022-11-19 07:54:18,259 INFO L226 Difference]: Without dead ends: 71 [2022-11-19 07:54:18,259 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 165 SyntacticMatches, 3 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 810 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=313, Invalid=3227, Unknown=0, NotChecked=0, Total=3540 [2022-11-19 07:54:18,260 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 154 mSDsluCounter, 312 mSDsCounter, 0 mSdLazyCounter, 928 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 330 SdHoareTripleChecker+Invalid, 937 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 928 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-19 07:54:18,260 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [154 Valid, 330 Invalid, 937 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 928 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-19 07:54:18,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-11-19 07:54:18,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2022-11-19 07:54:18,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 68 states have (on average 1.0588235294117647) internal successors, (72), 69 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:18,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2022-11-19 07:54:18,262 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 64 [2022-11-19 07:54:18,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:54:18,263 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2022-11-19 07:54:18,263 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 3.0) internal successors, (99), 33 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:18,263 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2022-11-19 07:54:18,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2022-11-19 07:54:18,264 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:54:18,264 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:54:18,279 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-19 07:54:18,478 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:54:18,479 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:54:18,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:54:18,479 INFO L85 PathProgramCache]: Analyzing trace with hash -1289225117, now seen corresponding path program 10 times [2022-11-19 07:54:18,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:54:18,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1500378716] [2022-11-19 07:54:18,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:54:18,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:54:18,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:54:19,145 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 25 proven. 171 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:19,146 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:54:19,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1500378716] [2022-11-19 07:54:19,146 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1500378716] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:54:19,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [527922666] [2022-11-19 07:54:19,146 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:54:19,146 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:54:19,146 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:54:19,150 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:54:19,177 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-19 07:54:19,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:54:19,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 50 conjunts are in the unsatisfiable core [2022-11-19 07:54:19,330 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:54:19,649 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 36 proven. 160 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:19,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:54:20,024 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-19 07:54:20,158 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 36 proven. 160 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:20,159 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [527922666] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:54:20,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2051141396] [2022-11-19 07:54:20,160 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:54:20,160 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:54:20,160 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:54:20,160 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:54:20,160 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:54:20,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:54:20,192 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:54:20,222 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:54:20,265 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:20,299 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:20,343 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:20,389 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2022-11-19 07:54:20,433 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:20,466 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:20,517 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:20,577 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:54:20,578 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:54:20,916 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:54:22,534 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9870#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:54:22,534 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:54:22,534 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:54:22,534 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 18] total 37 [2022-11-19 07:54:22,535 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657730301] [2022-11-19 07:54:22,535 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:54:22,535 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-19 07:54:22,535 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:54:22,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-19 07:54:22,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1999, Unknown=0, NotChecked=0, Total=2256 [2022-11-19 07:54:22,536 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand has 38 states, 37 states have (on average 3.7567567567567566) internal successors, (139), 38 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:23,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:54:23,177 INFO L93 Difference]: Finished difference Result 81 states and 83 transitions. [2022-11-19 07:54:23,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-19 07:54:23,178 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 37 states have (on average 3.7567567567567566) internal successors, (139), 38 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 66 [2022-11-19 07:54:23,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:54:23,179 INFO L225 Difference]: With dead ends: 81 [2022-11-19 07:54:23,179 INFO L226 Difference]: Without dead ends: 79 [2022-11-19 07:54:23,179 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 223 GetRequests, 159 SyntacticMatches, 8 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1174 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=502, Invalid=2804, Unknown=0, NotChecked=0, Total=3306 [2022-11-19 07:54:23,180 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 356 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 719 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 356 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 729 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 719 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:54:23,180 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [356 Valid, 234 Invalid, 729 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 719 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:54:23,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-11-19 07:54:23,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2022-11-19 07:54:23,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 74 states have (on average 1.054054054054054) internal successors, (78), 75 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:23,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2022-11-19 07:54:23,183 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 66 [2022-11-19 07:54:23,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:54:23,183 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2022-11-19 07:54:23,183 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 37 states have (on average 3.7567567567567566) internal successors, (139), 38 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:23,183 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2022-11-19 07:54:23,184 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-11-19 07:54:23,184 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:54:23,184 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:54:23,190 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-11-19 07:54:23,389 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-11-19 07:54:23,389 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:54:23,389 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:54:23,390 INFO L85 PathProgramCache]: Analyzing trace with hash 1651713411, now seen corresponding path program 11 times [2022-11-19 07:54:23,390 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:54:23,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902335554] [2022-11-19 07:54:23,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:54:23,390 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:54:23,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:54:24,309 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 38 proven. 203 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:24,309 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:54:24,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902335554] [2022-11-19 07:54:24,309 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [902335554] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:54:24,309 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1832482924] [2022-11-19 07:54:24,309 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:54:24,309 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:54:24,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:54:24,311 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:54:24,313 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-19 07:54:24,677 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-19 07:54:24,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:54:24,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 455 conjuncts, 67 conjunts are in the unsatisfiable core [2022-11-19 07:54:24,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:54:24,913 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:25,073 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 38 proven. 203 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:25,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:54:25,170 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 07:54:25,171 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 16 treesize of output 12 [2022-11-19 07:54:25,307 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 38 proven. 203 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:25,307 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1832482924] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:54:25,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1982306687] [2022-11-19 07:54:25,309 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:54:25,309 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:54:25,309 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:54:25,309 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:54:25,309 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:54:25,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:54:25,337 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:54:25,361 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:54:25,397 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:25,427 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:25,465 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:54:25,518 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-19 07:54:25,519 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2022-11-19 07:54:25,562 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:25,586 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:25,675 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-19 07:54:25,676 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-11-19 07:54:25,831 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-19 07:54:25,831 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-19 07:54:27,792 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:54:30,232 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10519#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.offset|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#NULL.offset|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:54:30,232 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:54:30,232 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:54:30,233 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 36 [2022-11-19 07:54:30,233 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009302761] [2022-11-19 07:54:30,233 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:54:30,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-19 07:54:30,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:54:30,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-19 07:54:30,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=1918, Unknown=0, NotChecked=0, Total=2070 [2022-11-19 07:54:30,234 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 36 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:31,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:54:31,480 INFO L93 Difference]: Finished difference Result 127 states and 129 transitions. [2022-11-19 07:54:31,480 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-19 07:54:31,480 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 36 states have internal predecessors, (109), 0 states have call successors, (0), 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 72 [2022-11-19 07:54:31,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:54:31,481 INFO L225 Difference]: With dead ends: 127 [2022-11-19 07:54:31,481 INFO L226 Difference]: Without dead ends: 79 [2022-11-19 07:54:31,482 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 188 SyntacticMatches, 3 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 935 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=340, Invalid=3820, Unknown=0, NotChecked=0, Total=4160 [2022-11-19 07:54:31,482 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 181 mSDsluCounter, 444 mSDsCounter, 0 mSdLazyCounter, 1325 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 1336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 07:54:31,482 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [181 Valid, 464 Invalid, 1336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1325 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 07:54:31,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2022-11-19 07:54:31,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2022-11-19 07:54:31,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 76 states have (on average 1.0526315789473684) internal successors, (80), 77 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:31,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2022-11-19 07:54:31,484 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 72 [2022-11-19 07:54:31,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:54:31,485 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2022-11-19 07:54:31,485 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 3.0277777777777777) internal successors, (109), 36 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:31,485 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2022-11-19 07:54:31,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-11-19 07:54:31,486 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:54:31,486 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:54:31,494 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-19 07:54:31,692 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:54:31,692 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:54:31,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:54:31,692 INFO L85 PathProgramCache]: Analyzing trace with hash 387210861, now seen corresponding path program 12 times [2022-11-19 07:54:31,692 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:54:31,693 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454308988] [2022-11-19 07:54:31,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:54:31,693 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:54:31,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:54:32,663 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 36 proven. 220 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:32,663 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:54:32,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454308988] [2022-11-19 07:54:32,664 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1454308988] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:54:32,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [926969564] [2022-11-19 07:54:32,664 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:54:32,664 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:54:32,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:54:32,666 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:54:32,693 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-19 07:54:32,976 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:54:32,976 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:54:32,980 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 56 conjunts are in the unsatisfiable core [2022-11-19 07:54:32,982 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:54:32,994 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-19 07:54:32,995 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-19 07:54:33,436 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 49 proven. 207 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:33,436 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:54:34,264 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 49 proven. 207 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:34,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [926969564] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:54:34,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1757572227] [2022-11-19 07:54:34,266 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:54:34,266 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:54:34,266 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:54:34,266 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:54:34,267 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:54:34,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:54:34,289 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:54:34,319 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:54:34,352 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:34,382 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:34,424 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:54:34,468 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-19 07:54:34,468 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2022-11-19 07:54:34,515 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:34,538 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:34,613 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-19 07:54:34,613 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-11-19 07:54:34,781 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-19 07:54:34,785 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-19 07:54:36,759 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:54:39,194 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11261#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.offset|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#NULL.offset|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:54:39,194 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:54:39,194 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:54:39,194 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 20, 20] total 50 [2022-11-19 07:54:39,194 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867978243] [2022-11-19 07:54:39,194 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:54:39,194 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-11-19 07:54:39,195 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:54:39,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-11-19 07:54:39,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=410, Invalid=3250, Unknown=0, NotChecked=0, Total=3660 [2022-11-19 07:54:39,195 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand has 51 states, 50 states have (on average 3.48) internal successors, (174), 51 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:40,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:54:40,149 INFO L93 Difference]: Finished difference Result 89 states and 91 transitions. [2022-11-19 07:54:40,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-19 07:54:40,149 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 50 states have (on average 3.48) internal successors, (174), 51 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2022-11-19 07:54:40,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:54:40,150 INFO L225 Difference]: With dead ends: 89 [2022-11-19 07:54:40,150 INFO L226 Difference]: Without dead ends: 87 [2022-11-19 07:54:40,151 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1622 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=806, Invalid=4306, Unknown=0, NotChecked=0, Total=5112 [2022-11-19 07:54:40,151 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 732 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 1010 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 732 SdHoareTripleChecker+Valid, 301 SdHoareTripleChecker+Invalid, 1021 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 1010 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 07:54:40,151 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [732 Valid, 301 Invalid, 1021 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 1010 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 07:54:40,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-11-19 07:54:40,153 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2022-11-19 07:54:40,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 82 states have (on average 1.048780487804878) internal successors, (86), 83 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:40,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2022-11-19 07:54:40,154 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 74 [2022-11-19 07:54:40,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:54:40,154 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2022-11-19 07:54:40,154 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 50 states have (on average 3.48) internal successors, (174), 51 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:40,154 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2022-11-19 07:54:40,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-11-19 07:54:40,155 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:54:40,155 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:54:40,167 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-19 07:54:40,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-11-19 07:54:40,367 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:54:40,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:54:40,367 INFO L85 PathProgramCache]: Analyzing trace with hash 1493981197, now seen corresponding path program 13 times [2022-11-19 07:54:40,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:54:40,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416456008] [2022-11-19 07:54:40,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:54:40,367 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:54:40,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:54:41,395 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 43 proven. 264 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:41,395 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:54:41,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416456008] [2022-11-19 07:54:41,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [416456008] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:54:41,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1243772170] [2022-11-19 07:54:41,396 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:54:41,396 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:54:41,396 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:54:41,397 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:54:41,421 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-19 07:54:41,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:54:41,613 INFO L263 TraceCheckSpWp]: Trace formula consists of 499 conjuncts, 73 conjunts are in the unsatisfiable core [2022-11-19 07:54:41,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:54:41,974 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:42,434 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 43 proven. 264 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:42,434 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:54:42,584 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 07:54:42,587 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 24 treesize of output 20 [2022-11-19 07:54:43,322 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 43 proven. 264 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:43,322 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1243772170] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:54:43,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [642667902] [2022-11-19 07:54:43,323 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:54:43,323 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:54:43,324 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:54:43,324 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:54:43,324 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:54:43,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:54:43,352 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:54:43,378 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:43,411 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:43,430 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:43,465 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:43,500 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:43,534 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:43,555 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:43,588 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:43,631 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:54:43,632 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:54:44,000 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:54:46,014 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11998#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:54:46,014 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:54:46,015 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:54:46,015 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24, 24] total 57 [2022-11-19 07:54:46,015 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003980424] [2022-11-19 07:54:46,015 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:54:46,015 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-11-19 07:54:46,015 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:54:46,016 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-11-19 07:54:46,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=4281, Unknown=0, NotChecked=0, Total=4556 [2022-11-19 07:54:46,017 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand has 58 states, 58 states have (on average 3.0689655172413794) internal successors, (178), 57 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:47,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:54:47,844 INFO L93 Difference]: Finished difference Result 141 states and 143 transitions. [2022-11-19 07:54:47,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-11-19 07:54:47,844 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 3.0689655172413794) internal successors, (178), 57 states have internal predecessors, (178), 0 states have call successors, (0), 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 80 [2022-11-19 07:54:47,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:54:47,845 INFO L225 Difference]: With dead ends: 141 [2022-11-19 07:54:47,845 INFO L226 Difference]: Without dead ends: 87 [2022-11-19 07:54:47,846 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 193 SyntacticMatches, 2 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2223 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=532, Invalid=7300, Unknown=0, NotChecked=0, Total=7832 [2022-11-19 07:54:47,846 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 361 mSDsluCounter, 661 mSDsCounter, 0 mSdLazyCounter, 1827 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 361 SdHoareTripleChecker+Valid, 683 SdHoareTripleChecker+Invalid, 1883 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 1827 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 43 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-19 07:54:47,847 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [361 Valid, 683 Invalid, 1883 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 1827 Invalid, 0 Unknown, 43 Unchecked, 0.9s Time] [2022-11-19 07:54:47,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-11-19 07:54:47,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2022-11-19 07:54:47,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 84 states have (on average 1.0476190476190477) internal successors, (88), 85 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:47,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2022-11-19 07:54:47,849 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 80 [2022-11-19 07:54:47,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:54:47,849 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2022-11-19 07:54:47,850 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 3.0689655172413794) internal successors, (178), 57 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:47,850 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2022-11-19 07:54:47,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-19 07:54:47,851 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:54:47,851 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:54:47,862 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-19 07:54:48,057 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-19 07:54:48,057 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:54:48,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:54:48,057 INFO L85 PathProgramCache]: Analyzing trace with hash 1535313655, now seen corresponding path program 14 times [2022-11-19 07:54:48,057 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:54:48,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [160164064] [2022-11-19 07:54:48,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:54:48,058 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:54:48,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:54:48,997 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 49 proven. 275 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:48,998 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:54:48,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [160164064] [2022-11-19 07:54:48,998 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [160164064] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:54:48,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1475620719] [2022-11-19 07:54:48,998 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:54:48,998 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:54:48,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:54:48,999 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:54:49,001 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-19 07:54:49,386 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-11-19 07:54:49,386 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:54:49,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-19 07:54:49,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:54:49,959 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 64 proven. 260 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:49,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:54:50,540 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-19 07:54:50,735 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 64 proven. 260 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:50,735 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1475620719] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:54:50,736 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [37731086] [2022-11-19 07:54:50,737 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:54:50,737 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:54:50,737 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:54:50,737 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:54:50,737 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:54:50,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:54:50,763 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:54:50,787 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:54:50,818 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:50,849 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:50,890 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:50,938 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2022-11-19 07:54:50,984 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:51,015 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:51,056 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:51,107 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:54:51,107 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:54:51,452 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:54:53,190 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12818#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:54:53,191 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:54:53,191 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:54:53,191 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 22, 22] total 54 [2022-11-19 07:54:53,191 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550717377] [2022-11-19 07:54:53,191 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:54:53,191 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-11-19 07:54:53,192 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:54:53,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-11-19 07:54:53,192 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=537, Invalid=3623, Unknown=0, NotChecked=0, Total=4160 [2022-11-19 07:54:53,193 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand has 55 states, 54 states have (on average 4.111111111111111) internal successors, (222), 55 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:53,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:54:53,930 INFO L93 Difference]: Finished difference Result 97 states and 99 transitions. [2022-11-19 07:54:53,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-19 07:54:53,931 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 54 states have (on average 4.111111111111111) internal successors, (222), 55 states have internal predecessors, (222), 0 states have call successors, (0), 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 82 [2022-11-19 07:54:53,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:54:53,932 INFO L225 Difference]: With dead ends: 97 [2022-11-19 07:54:53,932 INFO L226 Difference]: Without dead ends: 95 [2022-11-19 07:54:53,932 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 192 SyntacticMatches, 10 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2318 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=960, Invalid=4892, Unknown=0, NotChecked=0, Total=5852 [2022-11-19 07:54:53,933 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 704 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 805 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 704 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 831 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 805 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:54:53,933 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [704 Valid, 244 Invalid, 831 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 805 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-19 07:54:53,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-11-19 07:54:53,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 92. [2022-11-19 07:54:53,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 90 states have (on average 1.0444444444444445) internal successors, (94), 91 states have internal predecessors, (94), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:53,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2022-11-19 07:54:53,936 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 82 [2022-11-19 07:54:53,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:54:53,936 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2022-11-19 07:54:53,936 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 54 states have (on average 4.111111111111111) internal successors, (222), 55 states have internal predecessors, (222), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:54:53,936 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2022-11-19 07:54:53,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2022-11-19 07:54:53,937 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:54:53,937 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:54:53,949 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2022-11-19 07:54:54,144 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-19 07:54:54,144 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:54:54,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:54:54,145 INFO L85 PathProgramCache]: Analyzing trace with hash -1376194281, now seen corresponding path program 15 times [2022-11-19 07:54:54,145 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:54:54,145 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150491383] [2022-11-19 07:54:54,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:54:54,145 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:54:54,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:54:55,342 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 48 proven. 333 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:55,342 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:54:55,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150491383] [2022-11-19 07:54:55,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150491383] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:54:55,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1119995486] [2022-11-19 07:54:55,342 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:54:55,343 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:54:55,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:54:55,343 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:54:55,347 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-19 07:54:55,600 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:54:55,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:54:55,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 77 conjunts are in the unsatisfiable core [2022-11-19 07:54:55,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:54:55,910 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:56,110 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 48 proven. 333 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:56,110 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:54:56,230 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 07:54:56,232 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 16 treesize of output 12 [2022-11-19 07:54:56,389 INFO L134 CoverageAnalysis]: Checked inductivity of 382 backedges. 48 proven. 333 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:54:56,389 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1119995486] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:54:56,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [604030205] [2022-11-19 07:54:56,390 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:54:56,391 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:54:56,391 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:54:56,391 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:54:56,391 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:54:56,412 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:54:56,413 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:54:56,443 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:56,477 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:56,499 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:56,537 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:54:56,568 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:56,591 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:56,623 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:54:56,672 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:54:56,672 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:54:57,023 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:54:58,848 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13605#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:54:58,848 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:54:58,848 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:54:58,848 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 42 [2022-11-19 07:54:58,848 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678468991] [2022-11-19 07:54:58,848 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:54:58,849 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-19 07:54:58,849 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:54:58,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-19 07:54:58,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=2479, Unknown=0, NotChecked=0, Total=2652 [2022-11-19 07:54:58,849 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand has 42 states, 42 states have (on average 3.0714285714285716) internal successors, (129), 42 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:55:00,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:55:00,647 INFO L93 Difference]: Finished difference Result 155 states and 157 transitions. [2022-11-19 07:55:00,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-19 07:55:00,647 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 3.0714285714285716) internal successors, (129), 42 states have internal predecessors, (129), 0 states have call successors, (0), 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 [2022-11-19 07:55:00,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:55:00,653 INFO L225 Difference]: With dead ends: 155 [2022-11-19 07:55:00,653 INFO L226 Difference]: Without dead ends: 95 [2022-11-19 07:55:00,653 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 234 SyntacticMatches, 3 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1213 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=399, Invalid=5151, Unknown=0, NotChecked=0, Total=5550 [2022-11-19 07:55:00,654 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 272 mSDsluCounter, 617 mSDsCounter, 0 mSdLazyCounter, 1850 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 641 SdHoareTripleChecker+Invalid, 1862 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 1850 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-19 07:55:00,654 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [272 Valid, 641 Invalid, 1862 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 1850 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-19 07:55:00,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-11-19 07:55:00,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2022-11-19 07:55:00,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 92 states have (on average 1.0434782608695652) internal successors, (96), 93 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:55:00,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 96 transitions. [2022-11-19 07:55:00,657 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 96 transitions. Word has length 88 [2022-11-19 07:55:00,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:55:00,657 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 96 transitions. [2022-11-19 07:55:00,657 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 3.0714285714285716) internal successors, (129), 42 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:55:00,657 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 96 transitions. [2022-11-19 07:55:00,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2022-11-19 07:55:00,658 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:55:00,658 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:55:00,667 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-19 07:55:00,858 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-11-19 07:55:00,858 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:55:00,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:55:00,859 INFO L85 PathProgramCache]: Analyzing trace with hash -462481919, now seen corresponding path program 16 times [2022-11-19 07:55:00,859 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:55:00,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [98352105] [2022-11-19 07:55:00,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:55:00,859 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:55:00,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:55:01,895 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 64 proven. 336 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:55:01,895 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:55:01,895 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [98352105] [2022-11-19 07:55:01,895 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [98352105] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:55:01,896 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [275455115] [2022-11-19 07:55:01,896 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:55:01,896 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:55:01,896 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:55:01,897 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:55:01,925 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-19 07:55:02,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:55:02,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 556 conjuncts, 65 conjunts are in the unsatisfiable core [2022-11-19 07:55:02,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:55:02,724 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 81 proven. 319 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:55:02,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:55:03,308 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-19 07:55:03,547 INFO L134 CoverageAnalysis]: Checked inductivity of 401 backedges. 81 proven. 319 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:55:03,547 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [275455115] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:55:03,547 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2006179325] [2022-11-19 07:55:03,548 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:55:03,548 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:55:03,549 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:55:03,549 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:55:03,549 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:55:03,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:55:03,576 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:55:03,616 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:03,648 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:03,671 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:03,709 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:55:03,743 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:03,766 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:03,815 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:03,866 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:55:03,867 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:55:04,198 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:55:05,948 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14494#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:55:05,948 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:55:05,949 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:55:05,949 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 24, 24] total 49 [2022-11-19 07:55:05,949 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715081833] [2022-11-19 07:55:05,949 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:55:05,949 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-11-19 07:55:05,949 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:55:05,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-11-19 07:55:05,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=389, Invalid=3151, Unknown=0, NotChecked=0, Total=3540 [2022-11-19 07:55:05,950 INFO L87 Difference]: Start difference. First operand 94 states and 96 transitions. Second operand has 50 states, 49 states have (on average 3.816326530612245) internal successors, (187), 50 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:55:07,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:55:07,034 INFO L93 Difference]: Finished difference Result 105 states and 107 transitions. [2022-11-19 07:55:07,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-19 07:55:07,035 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 49 states have (on average 3.816326530612245) internal successors, (187), 50 states have internal predecessors, (187), 0 states have call successors, (0), 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 90 [2022-11-19 07:55:07,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:55:07,036 INFO L225 Difference]: With dead ends: 105 [2022-11-19 07:55:07,036 INFO L226 Difference]: Without dead ends: 103 [2022-11-19 07:55:07,036 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 222 SyntacticMatches, 11 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1954 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=805, Invalid=4451, Unknown=0, NotChecked=0, Total=5256 [2022-11-19 07:55:07,037 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 614 mSDsluCounter, 381 mSDsCounter, 0 mSdLazyCounter, 1324 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 614 SdHoareTripleChecker+Valid, 409 SdHoareTripleChecker+Invalid, 1333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 1324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:55:07,037 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [614 Valid, 409 Invalid, 1333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 1324 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 07:55:07,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-11-19 07:55:07,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 100. [2022-11-19 07:55:07,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 98 states have (on average 1.0408163265306123) internal successors, (102), 99 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:55:07,041 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 102 transitions. [2022-11-19 07:55:07,042 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 102 transitions. Word has length 90 [2022-11-19 07:55:07,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:55:07,042 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 102 transitions. [2022-11-19 07:55:07,042 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 49 states have (on average 3.816326530612245) internal successors, (187), 50 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:55:07,043 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 102 transitions. [2022-11-19 07:55:07,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-11-19 07:55:07,043 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:55:07,044 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:55:07,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-11-19 07:55:07,250 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-19 07:55:07,251 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:55:07,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:55:07,251 INFO L85 PathProgramCache]: Analyzing trace with hash 1683755169, now seen corresponding path program 17 times [2022-11-19 07:55:07,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:55:07,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387604329] [2022-11-19 07:55:07,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:55:07,252 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:55:07,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:55:08,576 INFO L134 CoverageAnalysis]: Checked inductivity of 464 backedges. 53 proven. 410 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:55:08,576 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:55:08,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387604329] [2022-11-19 07:55:08,576 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [387604329] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:55:08,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1229381323] [2022-11-19 07:55:08,577 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:55:08,577 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:55:08,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:55:08,578 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:55:08,580 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-19 07:55:09,270 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-11-19 07:55:09,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:55:09,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 587 conjuncts, 85 conjunts are in the unsatisfiable core [2022-11-19 07:55:09,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:55:09,682 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:09,916 INFO L134 CoverageAnalysis]: Checked inductivity of 464 backedges. 53 proven. 410 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:55:09,916 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:55:10,056 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 07:55:10,058 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 16 treesize of output 12 [2022-11-19 07:55:10,232 INFO L134 CoverageAnalysis]: Checked inductivity of 464 backedges. 53 proven. 410 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:55:10,232 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1229381323] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:55:10,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [107000385] [2022-11-19 07:55:10,234 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:55:10,234 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:55:10,234 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:55:10,235 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:55:10,235 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:55:10,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:55:10,276 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:55:10,304 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:55:10,349 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:10,379 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:10,423 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:55:10,483 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-19 07:55:10,483 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2022-11-19 07:55:10,534 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:10,555 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:10,670 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-19 07:55:10,671 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-11-19 07:55:10,861 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-19 07:55:10,861 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-19 07:55:12,864 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:55:15,571 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15350#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.offset|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#NULL.offset|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:55:15,571 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:55:15,571 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:55:15,571 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 45 [2022-11-19 07:55:15,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449677627] [2022-11-19 07:55:15,572 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:55:15,572 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-11-19 07:55:15,572 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:55:15,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-11-19 07:55:15,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=2794, Unknown=0, NotChecked=0, Total=2970 [2022-11-19 07:55:15,574 INFO L87 Difference]: Start difference. First operand 100 states and 102 transitions. Second operand has 45 states, 45 states have (on average 3.088888888888889) internal successors, (139), 45 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:55:17,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:55:17,510 INFO L93 Difference]: Finished difference Result 169 states and 171 transitions. [2022-11-19 07:55:17,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-19 07:55:17,510 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 3.088888888888889) internal successors, (139), 45 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2022-11-19 07:55:17,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:55:17,511 INFO L225 Difference]: With dead ends: 169 [2022-11-19 07:55:17,511 INFO L226 Difference]: Without dead ends: 103 [2022-11-19 07:55:17,512 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 338 GetRequests, 257 SyntacticMatches, 3 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1364 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=421, Invalid=5899, Unknown=0, NotChecked=0, Total=6320 [2022-11-19 07:55:17,512 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 243 mSDsluCounter, 672 mSDsCounter, 0 mSdLazyCounter, 1983 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 698 SdHoareTripleChecker+Invalid, 2039 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 1983 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 41 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:55:17,513 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [243 Valid, 698 Invalid, 2039 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 1983 Invalid, 0 Unknown, 41 Unchecked, 1.0s Time] [2022-11-19 07:55:17,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2022-11-19 07:55:17,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2022-11-19 07:55:17,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 100 states have (on average 1.04) internal successors, (104), 101 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:55:17,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 104 transitions. [2022-11-19 07:55:17,516 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 104 transitions. Word has length 96 [2022-11-19 07:55:17,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:55:17,516 INFO L495 AbstractCegarLoop]: Abstraction has 102 states and 104 transitions. [2022-11-19 07:55:17,516 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 3.088888888888889) internal successors, (139), 45 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:55:17,516 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 104 transitions. [2022-11-19 07:55:17,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2022-11-19 07:55:17,517 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:55:17,517 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:55:17,525 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-11-19 07:55:17,724 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2022-11-19 07:55:17,724 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:55:17,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:55:17,725 INFO L85 PathProgramCache]: Analyzing trace with hash -352605301, now seen corresponding path program 18 times [2022-11-19 07:55:17,725 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:55:17,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [987944621] [2022-11-19 07:55:17,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:55:17,725 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:55:17,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:55:18,933 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 81 proven. 403 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:55:18,933 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:55:18,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [987944621] [2022-11-19 07:55:18,934 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [987944621] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:55:18,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [860182799] [2022-11-19 07:55:18,934 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:55:18,934 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:55:18,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:55:18,935 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:55:18,937 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-19 07:55:19,246 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:55:19,246 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:55:19,251 INFO L263 TraceCheckSpWp]: Trace formula consists of 600 conjuncts, 71 conjunts are in the unsatisfiable core [2022-11-19 07:55:19,253 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:55:19,267 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-19 07:55:19,268 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-19 07:55:19,844 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 100 proven. 384 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:55:19,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:55:21,132 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 100 proven. 384 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:55:21,132 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [860182799] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:55:21,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [371789548] [2022-11-19 07:55:21,133 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:55:21,134 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:55:21,134 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:55:21,134 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:55:21,134 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:55:21,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:55:21,161 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:55:21,204 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:55:21,236 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:21,271 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:21,326 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:21,367 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2022-11-19 07:55:21,408 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:21,439 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:21,476 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:21,525 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:55:21,525 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:55:21,891 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:55:23,897 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16329#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:55:23,897 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:55:23,897 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:55:23,897 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 26, 26] total 65 [2022-11-19 07:55:23,898 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2144229315] [2022-11-19 07:55:23,898 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:55:23,898 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-11-19 07:55:23,898 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:55:23,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-11-19 07:55:23,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=652, Invalid=5048, Unknown=0, NotChecked=0, Total=5700 [2022-11-19 07:55:23,899 INFO L87 Difference]: Start difference. First operand 102 states and 104 transitions. Second operand has 66 states, 65 states have (on average 3.5076923076923077) internal successors, (228), 66 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:55:25,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:55:25,255 INFO L93 Difference]: Finished difference Result 113 states and 115 transitions. [2022-11-19 07:55:25,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-19 07:55:25,256 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 65 states have (on average 3.5076923076923077) internal successors, (228), 66 states have internal predecessors, (228), 0 states have call successors, (0), 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 98 [2022-11-19 07:55:25,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:55:25,256 INFO L225 Difference]: With dead ends: 113 [2022-11-19 07:55:25,257 INFO L226 Difference]: Without dead ends: 111 [2022-11-19 07:55:25,257 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 243 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2559 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=1303, Invalid=6707, Unknown=0, NotChecked=0, Total=8010 [2022-11-19 07:55:25,257 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 662 mSDsluCounter, 384 mSDsCounter, 0 mSdLazyCounter, 1414 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 662 SdHoareTripleChecker+Valid, 411 SdHoareTripleChecker+Invalid, 1420 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 1414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-19 07:55:25,258 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [662 Valid, 411 Invalid, 1420 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 1414 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-19 07:55:25,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-11-19 07:55:25,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 108. [2022-11-19 07:55:25,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 106 states have (on average 1.0377358490566038) internal successors, (110), 107 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:55:25,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 110 transitions. [2022-11-19 07:55:25,259 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 110 transitions. Word has length 98 [2022-11-19 07:55:25,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:55:25,260 INFO L495 AbstractCegarLoop]: Abstraction has 108 states and 110 transitions. [2022-11-19 07:55:25,260 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 65 states have (on average 3.5076923076923077) internal successors, (228), 66 states have internal predecessors, (228), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:55:25,260 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 110 transitions. [2022-11-19 07:55:25,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-11-19 07:55:25,261 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:55:25,261 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:55:25,267 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-19 07:55:25,465 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2022-11-19 07:55:25,466 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:55:25,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:55:25,466 INFO L85 PathProgramCache]: Analyzing trace with hash -696199509, now seen corresponding path program 19 times [2022-11-19 07:55:25,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:55:25,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [953811301] [2022-11-19 07:55:25,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:55:25,467 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:55:25,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:55:26,811 INFO L134 CoverageAnalysis]: Checked inductivity of 554 backedges. 58 proven. 495 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:55:26,811 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:55:26,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [953811301] [2022-11-19 07:55:26,811 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [953811301] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:55:26,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [893928436] [2022-11-19 07:55:26,812 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:55:26,812 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:55:26,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:55:26,813 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:55:26,815 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-19 07:55:27,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:55:27,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 631 conjuncts, 91 conjunts are in the unsatisfiable core [2022-11-19 07:55:27,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:55:27,556 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:28,356 INFO L134 CoverageAnalysis]: Checked inductivity of 554 backedges. 58 proven. 495 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:55:28,356 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:55:28,594 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 07:55:28,598 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 24 treesize of output 20 [2022-11-19 07:55:29,637 INFO L134 CoverageAnalysis]: Checked inductivity of 554 backedges. 58 proven. 495 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:55:29,637 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [893928436] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:55:29,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2008421258] [2022-11-19 07:55:29,638 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:55:29,638 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:55:29,638 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:55:29,638 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:55:29,639 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:55:29,664 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:55:29,667 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:55:29,697 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:29,729 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:29,748 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:29,789 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:29,832 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:29,859 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:29,881 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:29,917 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:29,963 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:55:29,963 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:55:30,303 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:55:32,653 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17279#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:55:32,654 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:55:32,654 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:55:32,654 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 30, 30] total 72 [2022-11-19 07:55:32,654 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744699783] [2022-11-19 07:55:32,654 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:55:32,654 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-11-19 07:55:32,654 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:55:32,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-11-19 07:55:32,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=329, Invalid=6477, Unknown=0, NotChecked=0, Total=6806 [2022-11-19 07:55:32,656 INFO L87 Difference]: Start difference. First operand 108 states and 110 transitions. Second operand has 73 states, 73 states have (on average 3.1780821917808217) internal successors, (232), 72 states have internal predecessors, (232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:55:35,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:55:35,529 INFO L93 Difference]: Finished difference Result 183 states and 185 transitions. [2022-11-19 07:55:35,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-19 07:55:35,530 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 3.1780821917808217) internal successors, (232), 72 states have internal predecessors, (232), 0 states have call successors, (0), 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 104 [2022-11-19 07:55:35,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:55:35,531 INFO L225 Difference]: With dead ends: 183 [2022-11-19 07:55:35,531 INFO L226 Difference]: Without dead ends: 111 [2022-11-19 07:55:35,532 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 366 GetRequests, 256 SyntacticMatches, 2 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3384 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=658, Invalid=11332, Unknown=0, NotChecked=0, Total=11990 [2022-11-19 07:55:35,533 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 337 mSDsluCounter, 968 mSDsCounter, 0 mSdLazyCounter, 2910 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 337 SdHoareTripleChecker+Valid, 996 SdHoareTripleChecker+Invalid, 2926 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 2910 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:55:35,533 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [337 Valid, 996 Invalid, 2926 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 2910 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-19 07:55:35,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2022-11-19 07:55:35,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 110. [2022-11-19 07:55:35,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 108 states have (on average 1.037037037037037) internal successors, (112), 109 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:55:35,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 112 transitions. [2022-11-19 07:55:35,536 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 112 transitions. Word has length 104 [2022-11-19 07:55:35,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:55:35,536 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 112 transitions. [2022-11-19 07:55:35,537 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 3.1780821917808217) internal successors, (232), 72 states have internal predecessors, (232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:55:35,537 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 112 transitions. [2022-11-19 07:55:35,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-11-19 07:55:35,538 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:55:35,538 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:55:35,545 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-19 07:55:35,744 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:55:35,744 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:55:35,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:55:35,745 INFO L85 PathProgramCache]: Analyzing trace with hash -9181291, now seen corresponding path program 20 times [2022-11-19 07:55:35,745 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:55:35,745 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055143387] [2022-11-19 07:55:35,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:55:35,745 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:55:35,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:55:36,907 INFO L134 CoverageAnalysis]: Checked inductivity of 577 backedges. 100 proven. 476 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:55:36,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:55:36,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055143387] [2022-11-19 07:55:36,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1055143387] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:55:36,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1650151801] [2022-11-19 07:55:36,908 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:55:36,908 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:55:36,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:55:36,910 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:55:36,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-19 07:55:37,557 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-11-19 07:55:37,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:55:37,562 INFO L263 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 62 conjunts are in the unsatisfiable core [2022-11-19 07:55:37,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:55:38,455 INFO L134 CoverageAnalysis]: Checked inductivity of 577 backedges. 121 proven. 455 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:55:38,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:55:39,324 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-19 07:55:39,633 INFO L134 CoverageAnalysis]: Checked inductivity of 577 backedges. 121 proven. 455 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:55:39,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1650151801] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:55:39,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1663740822] [2022-11-19 07:55:39,635 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:55:39,635 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:55:39,635 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:55:39,635 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:55:39,635 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:55:39,669 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:55:39,672 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:55:39,701 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:55:39,733 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:39,767 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:39,803 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:39,843 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2022-11-19 07:55:39,886 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:39,918 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:39,957 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:55:40,003 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:55:40,004 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:55:40,369 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:55:42,282 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18336#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:55:42,282 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:55:42,282 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:55:42,282 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 28, 28] total 69 [2022-11-19 07:55:42,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889449930] [2022-11-19 07:55:42,282 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:55:42,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-11-19 07:55:42,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:55:42,283 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-11-19 07:55:42,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=831, Invalid=5489, Unknown=0, NotChecked=0, Total=6320 [2022-11-19 07:55:42,284 INFO L87 Difference]: Start difference. First operand 110 states and 112 transitions. Second operand has 70 states, 69 states have (on average 4.173913043478261) internal successors, (288), 70 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:55:43,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:55:43,317 INFO L93 Difference]: Finished difference Result 121 states and 123 transitions. [2022-11-19 07:55:43,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-19 07:55:43,318 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 69 states have (on average 4.173913043478261) internal successors, (288), 70 states have internal predecessors, (288), 0 states have call successors, (0), 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 106 [2022-11-19 07:55:43,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:55:43,319 INFO L225 Difference]: With dead ends: 121 [2022-11-19 07:55:43,319 INFO L226 Difference]: Without dead ends: 119 [2022-11-19 07:55:43,319 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 252 SyntacticMatches, 13 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3623 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=1497, Invalid=7433, Unknown=0, NotChecked=0, Total=8930 [2022-11-19 07:55:43,320 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 547 mSDsluCounter, 297 mSDsCounter, 0 mSdLazyCounter, 1036 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 547 SdHoareTripleChecker+Valid, 329 SdHoareTripleChecker+Invalid, 1071 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 1036 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 07:55:43,320 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [547 Valid, 329 Invalid, 1071 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 1036 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 07:55:43,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-11-19 07:55:43,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 116. [2022-11-19 07:55:43,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 114 states have (on average 1.0350877192982457) internal successors, (118), 115 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) [2022-11-19 07:55:43,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 118 transitions. [2022-11-19 07:55:43,323 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 118 transitions. Word has length 106 [2022-11-19 07:55:43,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:55:43,324 INFO L495 AbstractCegarLoop]: Abstraction has 116 states and 118 transitions. [2022-11-19 07:55:43,324 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 69 states have (on average 4.173913043478261) internal successors, (288), 70 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:55:43,324 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 118 transitions. [2022-11-19 07:55:43,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2022-11-19 07:55:43,325 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:55:43,325 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:55:43,332 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2022-11-19 07:55:43,531 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:55:43,532 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:55:43,532 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:55:43,532 INFO L85 PathProgramCache]: Analyzing trace with hash -1210424523, now seen corresponding path program 21 times [2022-11-19 07:55:43,532 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:55:43,532 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1608612049] [2022-11-19 07:55:43,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:55:43,532 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:55:43,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:55:45,100 INFO L134 CoverageAnalysis]: Checked inductivity of 652 backedges. 63 proven. 588 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:55:45,100 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:55:45,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1608612049] [2022-11-19 07:55:45,100 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1608612049] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:55:45,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2044098104] [2022-11-19 07:55:45,101 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:55:45,101 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:55:45,101 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:55:45,102 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:55:45,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-11-19 07:55:45,442 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:55:45,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:55:45,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 675 conjuncts, 107 conjunts are in the unsatisfiable core [2022-11-19 07:55:45,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:55:45,999 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:56:30,044 INFO L321 Elim1Store]: treesize reduction 21, result has 48.8 percent of original size [2022-11-19 07:56:30,044 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 72 treesize of output 52 [2022-11-19 07:56:30,049 INFO L134 CoverageAnalysis]: Checked inductivity of 652 backedges. 87 proven. 477 refuted. 87 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:56:30,049 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:57:05,443 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 76 treesize of output 66 [2022-11-19 07:57:05,449 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-19 07:57:05,449 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 76 treesize of output 56 [2022-11-19 07:57:06,051 INFO L134 CoverageAnalysis]: Checked inductivity of 652 backedges. 123 proven. 528 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:57:06,051 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2044098104] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:57:06,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1254481234] [2022-11-19 07:57:06,053 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:57:06,053 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:57:06,053 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:57:06,053 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:57:06,054 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:57:06,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:57:06,075 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:57:06,103 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:57:06,151 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:57:06,189 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:57:06,228 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:57:06,289 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-19 07:57:06,290 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2022-11-19 07:57:06,339 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:57:06,360 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:57:06,458 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-19 07:57:06,458 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-11-19 07:57:06,604 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-19 07:57:06,604 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-19 07:57:08,586 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:57:12,135 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19372#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.offset|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#NULL.offset|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:57:12,135 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:57:12,135 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:57:12,136 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 39, 39] total 93 [2022-11-19 07:57:12,136 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [727680469] [2022-11-19 07:57:12,136 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:57:12,136 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2022-11-19 07:57:12,136 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:57:12,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2022-11-19 07:57:12,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=584, Invalid=9851, Unknown=71, NotChecked=0, Total=10506 [2022-11-19 07:57:12,137 INFO L87 Difference]: Start difference. First operand 116 states and 118 transitions. Second operand has 93 states, 93 states have (on average 3.225806451612903) internal successors, (300), 93 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:58:18,106 WARN L233 SmtUtils]: Spent 5.60s on a formula simplification. DAG size of input: 68 DAG size of output: 62 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 07:58:34,579 WARN L233 SmtUtils]: Spent 5.17s on a formula simplification. DAG size of input: 71 DAG size of output: 59 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 07:58:34,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:58:34,656 INFO L93 Difference]: Finished difference Result 197 states and 199 transitions. [2022-11-19 07:58:34,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-19 07:58:34,656 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 3.225806451612903) internal successors, (300), 93 states have internal predecessors, (300), 0 states have call successors, (0), 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 112 [2022-11-19 07:58:34,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:58:34,657 INFO L225 Difference]: With dead ends: 197 [2022-11-19 07:58:34,657 INFO L226 Difference]: Without dead ends: 119 [2022-11-19 07:58:34,659 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 408 GetRequests, 267 SyntacticMatches, 2 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 5519 ImplicationChecksByTransitivity, 164.1s TimeCoverageRelationStatistics Valid=1349, Invalid=18320, Unknown=71, NotChecked=0, Total=19740 [2022-11-19 07:58:34,659 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 410 mSDsluCounter, 827 mSDsCounter, 0 mSdLazyCounter, 2366 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 410 SdHoareTripleChecker+Valid, 853 SdHoareTripleChecker+Invalid, 2988 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 2366 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 587 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-11-19 07:58:34,660 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [410 Valid, 853 Invalid, 2988 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 2366 Invalid, 0 Unknown, 587 Unchecked, 1.3s Time] [2022-11-19 07:58:34,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-11-19 07:58:34,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2022-11-19 07:58:34,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 116 states have (on average 1.0344827586206897) internal successors, (120), 117 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:58:34,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 120 transitions. [2022-11-19 07:58:34,663 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 120 transitions. Word has length 112 [2022-11-19 07:58:34,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:58:34,663 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 120 transitions. [2022-11-19 07:58:34,663 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 3.225806451612903) internal successors, (300), 93 states have internal predecessors, (300), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:58:34,663 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 120 transitions. [2022-11-19 07:58:34,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2022-11-19 07:58:34,664 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:58:34,664 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:58:34,674 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2022-11-19 07:58:34,871 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-11-19 07:58:34,871 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:58:34,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:58:34,871 INFO L85 PathProgramCache]: Analyzing trace with hash 189458975, now seen corresponding path program 22 times [2022-11-19 07:58:34,872 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:58:34,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997713351] [2022-11-19 07:58:34,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:58:34,872 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:58:34,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:58:36,233 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 121 proven. 555 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:58:36,233 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:58:36,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997713351] [2022-11-19 07:58:36,233 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [997713351] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:58:36,233 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [142158522] [2022-11-19 07:58:36,233 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:58:36,234 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:58:36,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:58:36,234 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:58:36,237 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-11-19 07:58:36,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:58:36,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 688 conjuncts, 80 conjunts are in the unsatisfiable core [2022-11-19 07:58:36,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:58:37,279 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 144 proven. 532 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:58:37,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:58:38,232 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-19 07:58:38,626 INFO L134 CoverageAnalysis]: Checked inductivity of 677 backedges. 144 proven. 532 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:58:38,626 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [142158522] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:58:38,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1764220379] [2022-11-19 07:58:38,627 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:58:38,627 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:58:38,628 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:58:38,628 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:58:38,628 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:58:38,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:58:38,654 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:58:38,700 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:58:38,737 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:58:38,765 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:58:38,815 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 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:58:38,869 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-19 07:58:38,869 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2022-11-19 07:58:38,915 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:58:38,936 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:58:39,013 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-19 07:58:39,013 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-11-19 07:58:39,180 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-19 07:58:39,181 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-19 07:58:41,268 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:58:44,032 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20518#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.offset|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#NULL.offset|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:58:44,033 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:58:44,033 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:58:44,034 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 30, 30] total 61 [2022-11-19 07:58:44,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785901772] [2022-11-19 07:58:44,034 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:58:44,035 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-11-19 07:58:44,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:58:44,036 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-11-19 07:58:44,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=542, Invalid=4570, Unknown=0, NotChecked=0, Total=5112 [2022-11-19 07:58:44,036 INFO L87 Difference]: Start difference. First operand 118 states and 120 transitions. Second operand has 62 states, 61 states have (on average 3.8524590163934427) internal successors, (235), 62 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:58:45,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:58:45,704 INFO L93 Difference]: Finished difference Result 129 states and 131 transitions. [2022-11-19 07:58:45,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-19 07:58:45,704 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 61 states have (on average 3.8524590163934427) internal successors, (235), 62 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2022-11-19 07:58:45,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:58:45,705 INFO L225 Difference]: With dead ends: 129 [2022-11-19 07:58:45,705 INFO L226 Difference]: Without dead ends: 127 [2022-11-19 07:58:45,706 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 385 GetRequests, 285 SyntacticMatches, 14 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2952 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=1174, Invalid=6482, Unknown=0, NotChecked=0, Total=7656 [2022-11-19 07:58:45,706 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 658 mSDsluCounter, 506 mSDsCounter, 0 mSdLazyCounter, 1729 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 658 SdHoareTripleChecker+Valid, 537 SdHoareTripleChecker+Invalid, 1747 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 1729 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-19 07:58:45,707 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [658 Valid, 537 Invalid, 1747 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 1729 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-19 07:58:45,707 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2022-11-19 07:58:45,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 124. [2022-11-19 07:58:45,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 122 states have (on average 1.0327868852459017) internal successors, (126), 123 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:58:45,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 126 transitions. [2022-11-19 07:58:45,710 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 126 transitions. Word has length 114 [2022-11-19 07:58:45,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:58:45,710 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 126 transitions. [2022-11-19 07:58:45,711 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 61 states have (on average 3.8524590163934427) internal successors, (235), 62 states have internal predecessors, (235), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:58:45,711 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 126 transitions. [2022-11-19 07:58:45,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2022-11-19 07:58:45,711 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:58:45,712 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:58:45,722 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-11-19 07:58:45,918 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:58:45,918 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:58:45,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:58:45,919 INFO L85 PathProgramCache]: Analyzing trace with hash -1761356225, now seen corresponding path program 23 times [2022-11-19 07:58:45,919 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:58:45,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1910051987] [2022-11-19 07:58:45,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:58:45,919 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:58:46,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:58:47,708 INFO L134 CoverageAnalysis]: Checked inductivity of 758 backedges. 68 proven. 689 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:58:47,709 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:58:47,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1910051987] [2022-11-19 07:58:47,709 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1910051987] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:58:47,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [516365566] [2022-11-19 07:58:47,709 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:58:47,709 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:58:47,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:58:47,714 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:58:47,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-11-19 07:58:48,632 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-11-19 07:58:48,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:58:48,639 INFO L263 TraceCheckSpWp]: Trace formula consists of 719 conjuncts, 103 conjunts are in the unsatisfiable core [2022-11-19 07:58:48,641 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:58:49,143 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:58:49,391 INFO L134 CoverageAnalysis]: Checked inductivity of 758 backedges. 68 proven. 689 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:58:49,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:58:49,582 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 07:58:49,584 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 16 treesize of output 12 [2022-11-19 07:58:49,788 INFO L134 CoverageAnalysis]: Checked inductivity of 758 backedges. 68 proven. 689 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:58:49,789 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [516365566] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:58:49,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1411116862] [2022-11-19 07:58:49,790 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:58:49,790 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:58:49,790 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:58:49,791 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:58:49,791 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:58:49,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:58:49,819 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:58:49,851 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:58:49,882 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:58:49,918 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:58:49,952 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:58:50,003 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-19 07:58:50,003 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2022-11-19 07:58:50,045 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:58:50,070 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:58:50,147 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-19 07:58:50,147 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-11-19 07:58:50,302 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-19 07:58:50,302 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-19 07:58:52,495 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:58:55,447 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21581#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.offset|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#NULL.offset|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:58:55,447 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:58:55,447 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:58:55,447 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33] total 54 [2022-11-19 07:58:55,447 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000684117] [2022-11-19 07:58:55,447 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:58:55,448 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-19 07:58:55,448 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:58:55,448 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-19 07:58:55,449 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=3832, Unknown=0, NotChecked=0, Total=4032 [2022-11-19 07:58:55,449 INFO L87 Difference]: Start difference. First operand 124 states and 126 transitions. Second operand has 54 states, 54 states have (on average 3.1296296296296298) internal successors, (169), 54 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) [2022-11-19 07:58:58,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:58:58,448 INFO L93 Difference]: Finished difference Result 211 states and 213 transitions. [2022-11-19 07:58:58,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-11-19 07:58:58,448 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 3.1296296296296298) internal successors, (169), 54 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 120 [2022-11-19 07:58:58,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:58:58,449 INFO L225 Difference]: With dead ends: 211 [2022-11-19 07:58:58,449 INFO L226 Difference]: Without dead ends: 127 [2022-11-19 07:58:58,450 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 326 SyntacticMatches, 3 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 1874 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=502, Invalid=8428, Unknown=0, NotChecked=0, Total=8930 [2022-11-19 07:58:58,450 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 379 mSDsluCounter, 1145 mSDsCounter, 0 mSdLazyCounter, 3436 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 379 SdHoareTripleChecker+Valid, 1177 SdHoareTripleChecker+Invalid, 3453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 3436 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-19 07:58:58,451 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [379 Valid, 1177 Invalid, 3453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 3436 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-19 07:58:58,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2022-11-19 07:58:58,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 126. [2022-11-19 07:58:58,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 126 states, 124 states have (on average 1.032258064516129) internal successors, (128), 125 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:58:58,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 128 transitions. [2022-11-19 07:58:58,454 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 128 transitions. Word has length 120 [2022-11-19 07:58:58,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:58:58,454 INFO L495 AbstractCegarLoop]: Abstraction has 126 states and 128 transitions. [2022-11-19 07:58:58,454 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 3.1296296296296298) internal successors, (169), 54 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) [2022-11-19 07:58:58,455 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 128 transitions. [2022-11-19 07:58:58,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2022-11-19 07:58:58,455 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:58:58,455 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:58:58,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-11-19 07:58:58,663 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-11-19 07:58:58,663 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:58:58,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:58:58,663 INFO L85 PathProgramCache]: Analyzing trace with hash -753151191, now seen corresponding path program 24 times [2022-11-19 07:58:58,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:58:58,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053327197] [2022-11-19 07:58:58,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:58:58,664 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:58:58,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:59:00,508 INFO L134 CoverageAnalysis]: Checked inductivity of 785 backedges. 144 proven. 640 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:59:00,508 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:59:00,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053327197] [2022-11-19 07:59:00,509 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2053327197] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:59:00,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [423703600] [2022-11-19 07:59:00,509 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:59:00,509 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:59:00,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:59:00,510 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:59:00,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-11-19 07:59:01,089 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:59:01,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:59:01,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 732 conjuncts, 86 conjunts are in the unsatisfiable core [2022-11-19 07:59:01,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:59:01,114 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-19 07:59:01,114 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-19 07:59:01,925 INFO L134 CoverageAnalysis]: Checked inductivity of 785 backedges. 169 proven. 615 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:59:01,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:59:03,754 INFO L134 CoverageAnalysis]: Checked inductivity of 785 backedges. 169 proven. 615 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:59:03,754 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [423703600] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:59:03,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1949576181] [2022-11-19 07:59:03,756 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:59:03,756 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:59:03,756 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:59:03,756 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:59:03,756 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:59:03,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:59:03,777 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:59:03,813 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:59:03,849 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:03,880 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:03,919 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:59:03,966 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-19 07:59:03,967 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2022-11-19 07:59:04,012 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:04,037 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:04,141 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-19 07:59:04,141 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-11-19 07:59:04,291 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-19 07:59:04,291 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-19 07:59:06,564 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:59:09,603 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22797#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.offset|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#NULL.offset|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:59:09,603 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:59:09,603 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:59:09,603 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 32, 32] total 80 [2022-11-19 07:59:09,603 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [335963366] [2022-11-19 07:59:09,603 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:59:09,604 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2022-11-19 07:59:09,604 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:59:09,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2022-11-19 07:59:09,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=947, Invalid=7243, Unknown=0, NotChecked=0, Total=8190 [2022-11-19 07:59:09,605 INFO L87 Difference]: Start difference. First operand 126 states and 128 transitions. Second operand has 81 states, 80 states have (on average 3.525) internal successors, (282), 81 states have internal predecessors, (282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:59:11,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:59:11,497 INFO L93 Difference]: Finished difference Result 137 states and 139 transitions. [2022-11-19 07:59:11,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-19 07:59:11,498 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 80 states have (on average 3.525) internal successors, (282), 81 states have internal predecessors, (282), 0 states have call successors, (0), 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 122 [2022-11-19 07:59:11,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:59:11,499 INFO L225 Difference]: With dead ends: 137 [2022-11-19 07:59:11,499 INFO L226 Difference]: Without dead ends: 135 [2022-11-19 07:59:11,500 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 412 GetRequests, 306 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3701 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=1916, Invalid=9640, Unknown=0, NotChecked=0, Total=11556 [2022-11-19 07:59:11,500 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 377 mSDsluCounter, 587 mSDsCounter, 0 mSdLazyCounter, 2047 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 377 SdHoareTripleChecker+Valid, 620 SdHoareTripleChecker+Invalid, 2067 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 2047 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:59:11,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [377 Valid, 620 Invalid, 2067 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 2047 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-19 07:59:11,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-11-19 07:59:11,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 132. [2022-11-19 07:59:11,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 130 states have (on average 1.0307692307692307) internal successors, (134), 131 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:59:11,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 134 transitions. [2022-11-19 07:59:11,504 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 134 transitions. Word has length 122 [2022-11-19 07:59:11,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:59:11,504 INFO L495 AbstractCegarLoop]: Abstraction has 132 states and 134 transitions. [2022-11-19 07:59:11,504 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 80 states have (on average 3.525) internal successors, (282), 81 states have internal predecessors, (282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:59:11,505 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 134 transitions. [2022-11-19 07:59:11,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2022-11-19 07:59:11,505 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:59:11,506 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:59:11,513 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2022-11-19 07:59:11,713 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-11-19 07:59:11,713 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:59:11,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:59:11,713 INFO L85 PathProgramCache]: Analyzing trace with hash -541044791, now seen corresponding path program 25 times [2022-11-19 07:59:11,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:59:11,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420004486] [2022-11-19 07:59:11,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:59:11,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:59:11,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:59:13,615 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 73 proven. 798 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:59:13,616 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:59:13,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420004486] [2022-11-19 07:59:13,616 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [420004486] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:59:13,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [23575183] [2022-11-19 07:59:13,616 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:59:13,616 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:59:13,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:59:13,617 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:59:13,640 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-11-19 07:59:13,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:59:13,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 763 conjuncts, 109 conjunts are in the unsatisfiable core [2022-11-19 07:59:13,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:59:14,475 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:14,734 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 73 proven. 798 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:59:14,734 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:59:14,928 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 07:59:14,930 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 16 treesize of output 12 [2022-11-19 07:59:15,143 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 73 proven. 798 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:59:15,144 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [23575183] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:59:15,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1405830870] [2022-11-19 07:59:15,145 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:59:15,145 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:59:15,145 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:59:15,145 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:59:15,145 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:59:15,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:59:15,166 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:59:15,195 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:15,226 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:15,246 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:15,291 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:15,343 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:15,370 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:15,392 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:15,430 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:15,476 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:59:15,476 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:59:15,815 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:59:18,001 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23929#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:59:18,002 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:59:18,002 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:59:18,002 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 57 [2022-11-19 07:59:18,002 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755917945] [2022-11-19 07:59:18,002 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:59:18,002 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-11-19 07:59:18,002 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:59:18,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-11-19 07:59:18,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=4209, Unknown=0, NotChecked=0, Total=4422 [2022-11-19 07:59:18,003 INFO L87 Difference]: Start difference. First operand 132 states and 134 transitions. Second operand has 57 states, 57 states have (on average 3.1403508771929824) internal successors, (179), 57 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:59:21,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:59:21,222 INFO L93 Difference]: Finished difference Result 225 states and 227 transitions. [2022-11-19 07:59:21,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-11-19 07:59:21,222 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 3.1403508771929824) internal successors, (179), 57 states have internal predecessors, (179), 0 states have call successors, (0), 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 128 [2022-11-19 07:59:21,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:59:21,223 INFO L225 Difference]: With dead ends: 225 [2022-11-19 07:59:21,224 INFO L226 Difference]: Without dead ends: 135 [2022-11-19 07:59:21,225 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 450 GetRequests, 349 SyntacticMatches, 3 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2063 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=534, Invalid=9366, Unknown=0, NotChecked=0, Total=9900 [2022-11-19 07:59:21,225 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 316 mSDsluCounter, 1063 mSDsCounter, 0 mSdLazyCounter, 3300 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 316 SdHoareTripleChecker+Valid, 1097 SdHoareTripleChecker+Invalid, 3318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 3300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-19 07:59:21,226 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [316 Valid, 1097 Invalid, 3318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 3300 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-19 07:59:21,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-11-19 07:59:21,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 134. [2022-11-19 07:59:21,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 132 states have (on average 1.0303030303030303) internal successors, (136), 133 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:59:21,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 136 transitions. [2022-11-19 07:59:21,229 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 136 transitions. Word has length 128 [2022-11-19 07:59:21,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:59:21,229 INFO L495 AbstractCegarLoop]: Abstraction has 134 states and 136 transitions. [2022-11-19 07:59:21,229 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 3.1403508771929824) internal successors, (179), 57 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:59:21,230 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 136 transitions. [2022-11-19 07:59:21,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-11-19 07:59:21,230 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:59:21,230 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:59:21,237 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2022-11-19 07:59:21,431 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-11-19 07:59:21,431 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:59:21,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:59:21,431 INFO L85 PathProgramCache]: Analyzing trace with hash -123092301, now seen corresponding path program 26 times [2022-11-19 07:59:21,431 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:59:21,431 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1860666278] [2022-11-19 07:59:21,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:59:21,432 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:59:21,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:59:23,187 INFO L134 CoverageAnalysis]: Checked inductivity of 901 backedges. 169 proven. 731 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:59:23,187 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:59:23,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1860666278] [2022-11-19 07:59:23,188 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1860666278] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:59:23,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [450078107] [2022-11-19 07:59:23,188 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:59:23,188 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:59:23,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:59:23,189 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:59:23,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-11-19 07:59:24,031 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-11-19 07:59:24,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:59:24,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 776 conjuncts, 76 conjunts are in the unsatisfiable core [2022-11-19 07:59:24,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:59:25,285 INFO L134 CoverageAnalysis]: Checked inductivity of 901 backedges. 196 proven. 704 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:59:25,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:59:26,459 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-19 07:59:26,905 INFO L134 CoverageAnalysis]: Checked inductivity of 901 backedges. 196 proven. 704 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:59:26,905 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [450078107] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:59:26,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [260828183] [2022-11-19 07:59:26,906 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:59:26,906 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:59:26,907 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:59:26,907 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:59:26,907 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:59:26,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:59:26,937 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:59:26,964 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:59:26,999 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:27,027 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:27,065 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:27,104 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2022-11-19 07:59:27,148 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:27,181 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:27,214 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:27,259 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:59:27,259 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:59:27,612 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:59:29,654 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25223#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:59:29,654 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:59:29,654 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:59:29,654 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 34, 34] total 84 [2022-11-19 07:59:29,654 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558379092] [2022-11-19 07:59:29,654 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:59:29,655 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2022-11-19 07:59:29,655 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:59:29,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2022-11-19 07:59:29,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1197, Invalid=7733, Unknown=0, NotChecked=0, Total=8930 [2022-11-19 07:59:29,656 INFO L87 Difference]: Start difference. First operand 134 states and 136 transitions. Second operand has 85 states, 84 states have (on average 4.214285714285714) internal successors, (354), 85 states have internal predecessors, (354), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:59:30,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:59:30,936 INFO L93 Difference]: Finished difference Result 145 states and 147 transitions. [2022-11-19 07:59:30,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-19 07:59:30,937 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 84 states have (on average 4.214285714285714) internal successors, (354), 85 states have internal predecessors, (354), 0 states have call successors, (0), 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 130 [2022-11-19 07:59:30,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:59:30,937 INFO L225 Difference]: With dead ends: 145 [2022-11-19 07:59:30,938 INFO L226 Difference]: Without dead ends: 143 [2022-11-19 07:59:30,939 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 439 GetRequests, 312 SyntacticMatches, 16 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5207 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=2160, Invalid=10496, Unknown=0, NotChecked=0, Total=12656 [2022-11-19 07:59:30,939 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 1092 mSDsluCounter, 381 mSDsCounter, 0 mSdLazyCounter, 1165 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1092 SdHoareTripleChecker+Valid, 419 SdHoareTripleChecker+Invalid, 1204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 1165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 07:59:30,939 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1092 Valid, 419 Invalid, 1204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 1165 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 07:59:30,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-11-19 07:59:30,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 140. [2022-11-19 07:59:30,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 140 states, 138 states have (on average 1.0289855072463767) internal successors, (142), 139 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:59:30,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 142 transitions. [2022-11-19 07:59:30,942 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 142 transitions. Word has length 130 [2022-11-19 07:59:30,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:59:30,943 INFO L495 AbstractCegarLoop]: Abstraction has 140 states and 142 transitions. [2022-11-19 07:59:30,943 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 84 states have (on average 4.214285714285714) internal successors, (354), 85 states have internal predecessors, (354), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:59:30,943 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 142 transitions. [2022-11-19 07:59:30,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2022-11-19 07:59:30,944 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:59:30,944 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:59:30,951 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2022-11-19 07:59:31,151 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-11-19 07:59:31,152 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:59:31,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:59:31,152 INFO L85 PathProgramCache]: Analyzing trace with hash 1559949267, now seen corresponding path program 27 times [2022-11-19 07:59:31,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:59:31,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2128895390] [2022-11-19 07:59:31,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:59:31,153 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:59:31,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:59:33,247 INFO L134 CoverageAnalysis]: Checked inductivity of 994 backedges. 78 proven. 915 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:59:33,247 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:59:33,247 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2128895390] [2022-11-19 07:59:33,248 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2128895390] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:59:33,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [105462515] [2022-11-19 07:59:33,248 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 07:59:33,248 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:59:33,248 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:59:33,249 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:59:33,277 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-11-19 07:59:34,042 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 07:59:34,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:59:34,049 INFO L263 TraceCheckSpWp]: Trace formula consists of 807 conjuncts, 113 conjunts are in the unsatisfiable core [2022-11-19 07:59:34,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:59:34,682 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:34,970 INFO L134 CoverageAnalysis]: Checked inductivity of 994 backedges. 78 proven. 915 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:59:34,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:59:35,176 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 07:59:35,178 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 16 treesize of output 12 [2022-11-19 07:59:35,425 INFO L134 CoverageAnalysis]: Checked inductivity of 994 backedges. 78 proven. 915 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:59:35,425 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [105462515] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:59:35,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1861661986] [2022-11-19 07:59:35,426 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:59:35,427 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:59:35,427 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:59:35,427 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:59:35,427 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:59:35,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:59:35,453 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:59:35,479 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:35,515 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:35,533 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:35,572 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:35,610 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:35,647 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:35,668 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:35,708 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:35,750 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:59:35,751 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:59:36,128 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:59:38,436 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26424#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:59:38,436 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:59:38,436 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:59:38,436 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 60 [2022-11-19 07:59:38,436 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098152608] [2022-11-19 07:59:38,436 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:59:38,437 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-11-19 07:59:38,437 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:59:38,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-11-19 07:59:38,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=4609, Unknown=0, NotChecked=0, Total=4830 [2022-11-19 07:59:38,438 INFO L87 Difference]: Start difference. First operand 140 states and 142 transitions. Second operand has 60 states, 60 states have (on average 3.15) internal successors, (189), 60 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:59:42,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:59:42,397 INFO L93 Difference]: Finished difference Result 239 states and 241 transitions. [2022-11-19 07:59:42,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-19 07:59:42,398 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 3.15) internal successors, (189), 60 states have internal predecessors, (189), 0 states have call successors, (0), 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 136 [2022-11-19 07:59:42,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:59:42,399 INFO L225 Difference]: With dead ends: 239 [2022-11-19 07:59:42,400 INFO L226 Difference]: Without dead ends: 143 [2022-11-19 07:59:42,400 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 478 GetRequests, 372 SyntacticMatches, 3 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2260 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=561, Invalid=10359, Unknown=0, NotChecked=0, Total=10920 [2022-11-19 07:59:42,405 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 428 mSDsluCounter, 1536 mSDsCounter, 0 mSdLazyCounter, 4528 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 428 SdHoareTripleChecker+Valid, 1572 SdHoareTripleChecker+Invalid, 4651 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 4528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 105 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2022-11-19 07:59:42,406 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [428 Valid, 1572 Invalid, 4651 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 4528 Invalid, 0 Unknown, 105 Unchecked, 2.2s Time] [2022-11-19 07:59:42,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-11-19 07:59:42,408 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 142. [2022-11-19 07:59:42,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 140 states have (on average 1.0285714285714285) internal successors, (144), 141 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) [2022-11-19 07:59:42,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 144 transitions. [2022-11-19 07:59:42,408 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 144 transitions. Word has length 136 [2022-11-19 07:59:42,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:59:42,408 INFO L495 AbstractCegarLoop]: Abstraction has 142 states and 144 transitions. [2022-11-19 07:59:42,409 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 3.15) internal successors, (189), 60 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:59:42,409 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 144 transitions. [2022-11-19 07:59:42,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2022-11-19 07:59:42,409 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:59:42,410 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:59:42,417 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-11-19 07:59:42,610 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:59:42,610 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:59:42,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:59:42,610 INFO L85 PathProgramCache]: Analyzing trace with hash 2095044797, now seen corresponding path program 28 times [2022-11-19 07:59:42,611 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:59:42,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977594347] [2022-11-19 07:59:42,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:59:42,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:59:42,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:59:44,512 INFO L134 CoverageAnalysis]: Checked inductivity of 1025 backedges. 196 proven. 828 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:59:44,512 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:59:44,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977594347] [2022-11-19 07:59:44,513 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [977594347] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:59:44,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1839827668] [2022-11-19 07:59:44,513 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 07:59:44,513 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:59:44,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:59:44,514 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:59:44,516 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-11-19 07:59:44,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:59:44,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 820 conjuncts, 95 conjunts are in the unsatisfiable core [2022-11-19 07:59:44,819 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:59:45,778 INFO L134 CoverageAnalysis]: Checked inductivity of 1025 backedges. 225 proven. 799 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:59:45,778 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 07:59:46,951 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-19 07:59:47,473 INFO L134 CoverageAnalysis]: Checked inductivity of 1025 backedges. 225 proven. 799 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:59:47,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1839827668] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 07:59:47,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [136034883] [2022-11-19 07:59:47,474 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 07:59:47,474 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 07:59:47,474 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 07:59:47,474 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 07:59:47,474 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 07:59:47,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 07:59:47,492 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 07:59:47,528 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:47,573 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:47,594 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:47,634 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 07:59:47,666 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:47,686 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:47,719 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:47,763 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 07:59:47,763 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 07:59:48,168 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 07:59:53,112 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27781#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 07:59:53,112 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 07:59:53,112 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 07:59:53,112 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 36, 36] total 73 [2022-11-19 07:59:53,112 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660876257] [2022-11-19 07:59:53,112 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 07:59:53,113 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2022-11-19 07:59:53,113 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 07:59:53,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2022-11-19 07:59:53,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=761, Invalid=6211, Unknown=0, NotChecked=0, Total=6972 [2022-11-19 07:59:53,114 INFO L87 Difference]: Start difference. First operand 142 states and 144 transitions. Second operand has 74 states, 73 states have (on average 3.8767123287671232) internal successors, (283), 74 states have internal predecessors, (283), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:59:55,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 07:59:55,187 INFO L93 Difference]: Finished difference Result 153 states and 155 transitions. [2022-11-19 07:59:55,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-19 07:59:55,188 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 73 states have (on average 3.8767123287671232) internal successors, (283), 74 states have internal predecessors, (283), 0 states have call successors, (0), 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 138 [2022-11-19 07:59:55,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 07:59:55,189 INFO L225 Difference]: With dead ends: 153 [2022-11-19 07:59:55,189 INFO L226 Difference]: Without dead ends: 151 [2022-11-19 07:59:55,190 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 466 GetRequests, 332 SyntacticMatches, 33 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5216 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=1654, Invalid=8852, Unknown=0, NotChecked=0, Total=10506 [2022-11-19 07:59:55,190 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 648 mSDsluCounter, 757 mSDsCounter, 0 mSdLazyCounter, 2647 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 648 SdHoareTripleChecker+Valid, 797 SdHoareTripleChecker+Invalid, 2661 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 2647 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-19 07:59:55,190 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [648 Valid, 797 Invalid, 2661 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 2647 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-19 07:59:55,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2022-11-19 07:59:55,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 148. [2022-11-19 07:59:55,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 146 states have (on average 1.0273972602739727) internal successors, (150), 147 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:59:55,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 150 transitions. [2022-11-19 07:59:55,194 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 150 transitions. Word has length 138 [2022-11-19 07:59:55,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 07:59:55,194 INFO L495 AbstractCegarLoop]: Abstraction has 148 states and 150 transitions. [2022-11-19 07:59:55,195 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 73 states have (on average 3.8767123287671232) internal successors, (283), 74 states have internal predecessors, (283), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 07:59:55,195 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 150 transitions. [2022-11-19 07:59:55,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-11-19 07:59:55,196 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 07:59:55,196 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 07:59:55,206 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-11-19 07:59:55,403 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable51 [2022-11-19 07:59:55,403 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 07:59:55,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 07:59:55,404 INFO L85 PathProgramCache]: Analyzing trace with hash 986109533, now seen corresponding path program 29 times [2022-11-19 07:59:55,404 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 07:59:55,404 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1793561536] [2022-11-19 07:59:55,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 07:59:55,405 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 07:59:55,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 07:59:57,466 INFO L134 CoverageAnalysis]: Checked inductivity of 1124 backedges. 83 proven. 1040 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:59:57,466 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 07:59:57,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1793561536] [2022-11-19 07:59:57,467 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1793561536] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 07:59:57,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [35339195] [2022-11-19 07:59:57,467 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 07:59:57,467 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 07:59:57,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 07:59:57,468 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 07:59:57,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-11-19 07:59:58,798 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 18 check-sat command(s) [2022-11-19 07:59:58,799 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 07:59:58,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 851 conjuncts, 121 conjunts are in the unsatisfiable core [2022-11-19 07:59:58,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 07:59:59,502 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 07:59:59,821 INFO L134 CoverageAnalysis]: Checked inductivity of 1124 backedges. 83 proven. 1040 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 07:59:59,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:00:00,068 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 08:00:00,070 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 16 treesize of output 12 [2022-11-19 08:00:00,315 INFO L134 CoverageAnalysis]: Checked inductivity of 1124 backedges. 83 proven. 1040 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:00:00,316 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [35339195] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:00:00,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2028667639] [2022-11-19 08:00:00,317 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:00:00,317 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:00:00,317 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:00:00,317 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:00:00,317 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:00:00,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:00:00,335 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 08:00:00,364 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:00,402 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:00,421 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:00,466 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 08:00:00,497 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:00,516 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:00,545 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:00,592 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 08:00:00,592 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 08:00:01,032 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:00:06,900 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29051#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 08:00:06,900 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:00:06,900 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:00:06,900 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39] total 63 [2022-11-19 08:00:06,900 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623896773] [2022-11-19 08:00:06,900 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:00:06,901 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2022-11-19 08:00:06,901 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:00:06,901 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2022-11-19 08:00:06,902 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=5027, Unknown=0, NotChecked=0, Total=5256 [2022-11-19 08:00:06,902 INFO L87 Difference]: Start difference. First operand 148 states and 150 transitions. Second operand has 63 states, 63 states have (on average 3.1587301587301586) internal successors, (199), 63 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:00:11,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:00:11,266 INFO L93 Difference]: Finished difference Result 253 states and 255 transitions. [2022-11-19 08:00:11,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2022-11-19 08:00:11,267 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 3.1587301587301586) internal successors, (199), 63 states have internal predecessors, (199), 0 states have call successors, (0), 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 144 [2022-11-19 08:00:11,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:00:11,268 INFO L225 Difference]: With dead ends: 253 [2022-11-19 08:00:11,268 INFO L226 Difference]: Without dead ends: 151 [2022-11-19 08:00:11,269 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 506 GetRequests, 378 SyntacticMatches, 20 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2958 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=588, Invalid=11402, Unknown=0, NotChecked=0, Total=11990 [2022-11-19 08:00:11,269 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 361 mSDsluCounter, 1694 mSDsCounter, 0 mSdLazyCounter, 5129 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 361 SdHoareTripleChecker+Valid, 1732 SdHoareTripleChecker+Invalid, 5150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 5129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-11-19 08:00:11,270 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [361 Valid, 1732 Invalid, 5150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 5129 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-11-19 08:00:11,270 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2022-11-19 08:00:11,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 150. [2022-11-19 08:00:11,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 148 states have (on average 1.027027027027027) internal successors, (152), 149 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:00:11,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 152 transitions. [2022-11-19 08:00:11,273 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 152 transitions. Word has length 144 [2022-11-19 08:00:11,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:00:11,273 INFO L495 AbstractCegarLoop]: Abstraction has 150 states and 152 transitions. [2022-11-19 08:00:11,274 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 3.1587301587301586) internal successors, (199), 63 states have internal predecessors, (199), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:00:11,274 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 152 transitions. [2022-11-19 08:00:11,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2022-11-19 08:00:11,274 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:00:11,275 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:00:11,286 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-11-19 08:00:11,483 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2022-11-19 08:00:11,484 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 08:00:11,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:00:11,484 INFO L85 PathProgramCache]: Analyzing trace with hash -1043253945, now seen corresponding path program 30 times [2022-11-19 08:00:11,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:00:11,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1334293402] [2022-11-19 08:00:11,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:00:11,484 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:00:11,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:00:13,255 INFO L134 CoverageAnalysis]: Checked inductivity of 1157 backedges. 225 proven. 931 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:00:13,256 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:00:13,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1334293402] [2022-11-19 08:00:13,256 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1334293402] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:00:13,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1599021828] [2022-11-19 08:00:13,257 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:00:13,257 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:00:13,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:00:13,258 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:00:13,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-11-19 08:00:13,974 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:00:13,974 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:00:13,981 INFO L263 TraceCheckSpWp]: Trace formula consists of 864 conjuncts, 105 conjunts are in the unsatisfiable core [2022-11-19 08:00:13,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:00:13,999 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-19 08:00:13,999 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-19 08:00:15,161 INFO L134 CoverageAnalysis]: Checked inductivity of 1157 backedges. 256 proven. 900 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:00:15,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:00:17,880 INFO L134 CoverageAnalysis]: Checked inductivity of 1157 backedges. 256 proven. 900 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:00:17,880 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1599021828] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:00:17,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [871530903] [2022-11-19 08:00:17,881 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:00:17,881 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:00:17,881 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:00:17,882 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:00:17,882 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:00:17,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:00:17,909 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 08:00:17,938 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:17,967 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:17,987 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:18,029 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 08:00:18,066 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:18,086 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:18,125 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:18,170 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 08:00:18,170 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 08:00:18,582 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:00:24,597 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30504#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 08:00:24,597 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:00:24,598 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:00:24,598 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37] total 94 [2022-11-19 08:00:24,598 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613852797] [2022-11-19 08:00:24,598 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:00:24,598 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 96 states [2022-11-19 08:00:24,599 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:00:24,599 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2022-11-19 08:00:24,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1413, Invalid=9717, Unknown=0, NotChecked=0, Total=11130 [2022-11-19 08:00:24,600 INFO L87 Difference]: Start difference. First operand 150 states and 152 transitions. Second operand has 96 states, 95 states have (on average 3.568421052631579) internal successors, (339), 95 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:00:26,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:00:26,727 INFO L93 Difference]: Finished difference Result 161 states and 163 transitions. [2022-11-19 08:00:26,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-19 08:00:26,728 INFO L78 Accepts]: Start accepts. Automaton has has 96 states, 95 states have (on average 3.568421052631579) internal successors, (339), 95 states have internal predecessors, (339), 0 states have call successors, (0), 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 146 [2022-11-19 08:00:26,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:00:26,729 INFO L225 Difference]: With dead ends: 161 [2022-11-19 08:00:26,729 INFO L226 Difference]: Without dead ends: 159 [2022-11-19 08:00:26,730 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 493 GetRequests, 352 SyntacticMatches, 17 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6639 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=2801, Invalid=12949, Unknown=0, NotChecked=0, Total=15750 [2022-11-19 08:00:26,731 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 683 mSDsluCounter, 802 mSDsCounter, 0 mSdLazyCounter, 2635 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 683 SdHoareTripleChecker+Valid, 844 SdHoareTripleChecker+Invalid, 2657 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 2635 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-19 08:00:26,731 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [683 Valid, 844 Invalid, 2657 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 2635 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-11-19 08:00:26,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2022-11-19 08:00:26,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 156. [2022-11-19 08:00:26,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 154 states have (on average 1.025974025974026) internal successors, (158), 155 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:00:26,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 158 transitions. [2022-11-19 08:00:26,734 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 158 transitions. Word has length 146 [2022-11-19 08:00:26,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:00:26,735 INFO L495 AbstractCegarLoop]: Abstraction has 156 states and 158 transitions. [2022-11-19 08:00:26,735 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 96 states, 95 states have (on average 3.568421052631579) internal successors, (339), 95 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:00:26,735 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 158 transitions. [2022-11-19 08:00:26,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2022-11-19 08:00:26,736 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:00:26,736 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:00:26,749 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2022-11-19 08:00:26,944 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:00:26,944 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 08:00:26,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:00:26,944 INFO L85 PathProgramCache]: Analyzing trace with hash -2007030937, now seen corresponding path program 31 times [2022-11-19 08:00:26,945 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:00:26,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1059213950] [2022-11-19 08:00:26,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:00:26,945 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:00:27,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:00:29,377 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 88 proven. 1173 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:00:29,377 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:00:29,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1059213950] [2022-11-19 08:00:29,378 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1059213950] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:00:29,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2047123384] [2022-11-19 08:00:29,378 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:00:29,378 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:00:29,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:00:29,379 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:00:29,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-11-19 08:00:29,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:00:29,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 895 conjuncts, 127 conjunts are in the unsatisfiable core [2022-11-19 08:00:29,733 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:00:30,494 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:30,812 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 88 proven. 1173 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:00:30,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:00:31,056 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 08:00:31,058 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 16 treesize of output 12 [2022-11-19 08:00:31,313 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 88 proven. 1173 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:00:31,314 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2047123384] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:00:31,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1801759891] [2022-11-19 08:00:31,314 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:00:31,315 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:00:31,315 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:00:31,315 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:00:31,315 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:00:31,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:00:31,340 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 08:00:31,370 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 08:00:31,408 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:31,434 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:31,476 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 08:00:31,529 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-19 08:00:31,529 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2022-11-19 08:00:31,589 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:31,609 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:31,709 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-19 08:00:31,709 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-11-19 08:00:31,867 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-19 08:00:31,868 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-19 08:00:33,432 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:00:36,621 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31843#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 08:00:36,621 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:00:36,621 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:00:36,621 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41] total 66 [2022-11-19 08:00:36,622 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987726878] [2022-11-19 08:00:36,622 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:00:36,622 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-11-19 08:00:36,622 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:00:36,623 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-11-19 08:00:36,623 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=232, Invalid=5468, Unknown=0, NotChecked=0, Total=5700 [2022-11-19 08:00:36,623 INFO L87 Difference]: Start difference. First operand 156 states and 158 transitions. Second operand has 66 states, 66 states have (on average 3.1666666666666665) internal successors, (209), 66 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:00:41,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:00:41,081 INFO L93 Difference]: Finished difference Result 267 states and 269 transitions. [2022-11-19 08:00:41,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-11-19 08:00:41,081 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 3.1666666666666665) internal successors, (209), 66 states have internal predecessors, (209), 0 states have call successors, (0), 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 152 [2022-11-19 08:00:41,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:00:41,082 INFO L225 Difference]: With dead ends: 267 [2022-11-19 08:00:41,082 INFO L226 Difference]: Without dead ends: 159 [2022-11-19 08:00:41,083 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 534 GetRequests, 418 SyntacticMatches, 3 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2680 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=610, Invalid=12500, Unknown=0, NotChecked=0, Total=13110 [2022-11-19 08:00:41,083 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 595 mSDsluCounter, 1717 mSDsCounter, 0 mSdLazyCounter, 5080 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 595 SdHoareTripleChecker+Valid, 1757 SdHoareTripleChecker+Invalid, 5203 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 5080 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 101 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-11-19 08:00:41,083 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [595 Valid, 1757 Invalid, 5203 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 5080 Invalid, 0 Unknown, 101 Unchecked, 2.4s Time] [2022-11-19 08:00:41,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2022-11-19 08:00:41,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 158. [2022-11-19 08:00:41,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 156 states have (on average 1.0256410256410255) internal successors, (160), 157 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:00:41,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 160 transitions. [2022-11-19 08:00:41,086 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 160 transitions. Word has length 152 [2022-11-19 08:00:41,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:00:41,087 INFO L495 AbstractCegarLoop]: Abstraction has 158 states and 160 transitions. [2022-11-19 08:00:41,087 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 3.1666666666666665) internal successors, (209), 66 states have internal predecessors, (209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:00:41,087 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 160 transitions. [2022-11-19 08:00:41,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2022-11-19 08:00:41,088 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:00:41,088 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:00:41,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2022-11-19 08:00:41,296 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:00:41,296 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 08:00:41,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:00:41,297 INFO L85 PathProgramCache]: Analyzing trace with hash 213448785, now seen corresponding path program 32 times [2022-11-19 08:00:41,297 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:00:41,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955189233] [2022-11-19 08:00:41,297 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:00:41,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:00:41,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:00:43,654 INFO L134 CoverageAnalysis]: Checked inductivity of 1297 backedges. 256 proven. 1040 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:00:43,654 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:00:43,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955189233] [2022-11-19 08:00:43,654 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1955189233] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:00:43,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [199795342] [2022-11-19 08:00:43,654 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:00:43,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:00:43,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:00:43,656 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:00:43,657 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-11-19 08:00:44,566 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2022-11-19 08:00:44,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:00:44,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 908 conjuncts, 88 conjunts are in the unsatisfiable core [2022-11-19 08:00:44,575 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:00:46,458 INFO L134 CoverageAnalysis]: Checked inductivity of 1297 backedges. 289 proven. 1007 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:00:46,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:00:48,220 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-19 08:00:48,911 INFO L134 CoverageAnalysis]: Checked inductivity of 1297 backedges. 289 proven. 1007 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:00:48,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [199795342] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:00:48,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [626306457] [2022-11-19 08:00:48,914 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:00:48,914 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:00:48,914 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:00:48,915 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:00:48,915 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:00:48,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:00:48,950 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 08:00:48,980 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 08:00:49,019 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:49,060 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:49,106 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 08:00:49,163 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-19 08:00:49,163 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2022-11-19 08:00:49,209 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:49,229 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:00:49,337 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-19 08:00:49,338 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-11-19 08:00:49,510 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-19 08:00:49,511 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-19 08:00:51,159 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:00:54,173 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33374#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 08:00:54,173 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:00:54,173 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:00:54,173 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 40, 40] total 99 [2022-11-19 08:00:54,174 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878500015] [2022-11-19 08:00:54,174 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:00:54,174 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 100 states [2022-11-19 08:00:54,174 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:00:54,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 100 interpolants. [2022-11-19 08:00:54,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1620, Invalid=10370, Unknown=0, NotChecked=0, Total=11990 [2022-11-19 08:00:54,176 INFO L87 Difference]: Start difference. First operand 158 states and 160 transitions. Second operand has 100 states, 99 states have (on average 4.242424242424242) internal successors, (420), 100 states have internal predecessors, (420), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:00:56,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:00:56,420 INFO L93 Difference]: Finished difference Result 169 states and 171 transitions. [2022-11-19 08:00:56,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-19 08:00:56,420 INFO L78 Accepts]: Start accepts. Automaton has has 100 states, 99 states have (on average 4.242424242424242) internal successors, (420), 100 states have internal predecessors, (420), 0 states have call successors, (0), 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 154 [2022-11-19 08:00:56,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:00:56,421 INFO L225 Difference]: With dead ends: 169 [2022-11-19 08:00:56,421 INFO L226 Difference]: Without dead ends: 167 [2022-11-19 08:00:56,422 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 520 GetRequests, 372 SyntacticMatches, 19 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7099 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=2934, Invalid=14096, Unknown=0, NotChecked=0, Total=17030 [2022-11-19 08:00:56,422 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 1282 mSDsluCounter, 626 mSDsCounter, 0 mSdLazyCounter, 1938 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1282 SdHoareTripleChecker+Valid, 667 SdHoareTripleChecker+Invalid, 1984 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 1938 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-19 08:00:56,422 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1282 Valid, 667 Invalid, 1984 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 1938 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-19 08:00:56,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-11-19 08:00:56,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 164. [2022-11-19 08:00:56,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 162 states have (on average 1.0246913580246915) internal successors, (166), 163 states have internal predecessors, (166), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:00:56,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 166 transitions. [2022-11-19 08:00:56,425 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 166 transitions. Word has length 154 [2022-11-19 08:00:56,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:00:56,425 INFO L495 AbstractCegarLoop]: Abstraction has 164 states and 166 transitions. [2022-11-19 08:00:56,426 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 100 states, 99 states have (on average 4.242424242424242) internal successors, (420), 100 states have internal predecessors, (420), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:00:56,426 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 166 transitions. [2022-11-19 08:00:56,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2022-11-19 08:00:56,427 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:00:56,427 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:00:56,438 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-11-19 08:00:56,629 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2022-11-19 08:00:56,630 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 08:00:56,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:00:56,630 INFO L85 PathProgramCache]: Analyzing trace with hash 975632113, now seen corresponding path program 33 times [2022-11-19 08:00:56,630 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:00:56,630 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944128673] [2022-11-19 08:00:56,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:00:56,630 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:00:56,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:00:59,073 INFO L134 CoverageAnalysis]: Checked inductivity of 1408 backedges. 93 proven. 1314 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:00:59,074 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:00:59,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944128673] [2022-11-19 08:00:59,074 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [944128673] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:00:59,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770435636] [2022-11-19 08:00:59,074 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:00:59,074 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:00:59,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:00:59,075 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:00:59,077 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-11-19 08:00:59,935 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:00:59,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:00:59,942 INFO L263 TraceCheckSpWp]: Trace formula consists of 939 conjuncts, 131 conjunts are in the unsatisfiable core [2022-11-19 08:00:59,946 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:01:00,803 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:01,146 INFO L134 CoverageAnalysis]: Checked inductivity of 1408 backedges. 93 proven. 1314 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:01:01,146 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:01:01,390 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 08:01:01,391 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 16 treesize of output 12 [2022-11-19 08:01:01,655 INFO L134 CoverageAnalysis]: Checked inductivity of 1408 backedges. 93 proven. 1314 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:01:01,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770435636] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:01:01,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1509071714] [2022-11-19 08:01:01,657 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:01:01,657 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:01:01,657 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:01:01,657 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:01:01,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:01:01,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:01:01,686 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 08:01:01,717 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 08:01:01,754 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:01,807 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:01,842 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 08:01:01,896 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-19 08:01:01,896 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2022-11-19 08:01:01,940 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 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:01,963 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:02,048 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-19 08:01:02,048 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-11-19 08:01:02,249 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-19 08:01:02,250 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-19 08:01:04,371 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:01:07,830 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34782#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.offset|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#NULL.offset|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 08:01:07,831 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:01:07,831 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:01:07,831 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 69 [2022-11-19 08:01:07,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148594849] [2022-11-19 08:01:07,831 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:01:07,831 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-11-19 08:01:07,831 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:01:07,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-11-19 08:01:07,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=5922, Unknown=0, NotChecked=0, Total=6162 [2022-11-19 08:01:07,832 INFO L87 Difference]: Start difference. First operand 164 states and 166 transitions. Second operand has 69 states, 69 states have (on average 3.1739130434782608) internal successors, (219), 69 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:01:12,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:01:12,924 INFO L93 Difference]: Finished difference Result 281 states and 283 transitions. [2022-11-19 08:01:12,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2022-11-19 08:01:12,925 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 3.1739130434782608) internal successors, (219), 69 states have internal predecessors, (219), 0 states have call successors, (0), 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 160 [2022-11-19 08:01:12,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:01:12,926 INFO L225 Difference]: With dead ends: 281 [2022-11-19 08:01:12,926 INFO L226 Difference]: Without dead ends: 167 [2022-11-19 08:01:12,927 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 562 GetRequests, 441 SyntacticMatches, 3 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 2904 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=637, Invalid=13643, Unknown=0, NotChecked=0, Total=14280 [2022-11-19 08:01:12,927 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 395 mSDsluCounter, 1933 mSDsCounter, 0 mSdLazyCounter, 5851 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 395 SdHoareTripleChecker+Valid, 1975 SdHoareTripleChecker+Invalid, 5872 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 5851 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-11-19 08:01:12,927 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [395 Valid, 1975 Invalid, 5872 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 5851 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-11-19 08:01:12,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2022-11-19 08:01:12,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2022-11-19 08:01:12,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 164 states have (on average 1.024390243902439) internal successors, (168), 165 states have internal predecessors, (168), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:01:12,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 168 transitions. [2022-11-19 08:01:12,931 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 168 transitions. Word has length 160 [2022-11-19 08:01:12,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:01:12,931 INFO L495 AbstractCegarLoop]: Abstraction has 166 states and 168 transitions. [2022-11-19 08:01:12,931 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 3.1739130434782608) internal successors, (219), 69 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:01:12,931 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 168 transitions. [2022-11-19 08:01:12,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2022-11-19 08:01:12,932 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:01:12,932 INFO L195 NwaCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:01:12,946 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2022-11-19 08:01:13,140 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:01:13,140 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 08:01:13,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:01:13,141 INFO L85 PathProgramCache]: Analyzing trace with hash -2013642277, now seen corresponding path program 34 times [2022-11-19 08:01:13,141 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:01:13,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302268066] [2022-11-19 08:01:13,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:01:13,141 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:01:13,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:01:15,128 INFO L134 CoverageAnalysis]: Checked inductivity of 1445 backedges. 289 proven. 1155 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:01:15,128 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:01:15,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302268066] [2022-11-19 08:01:15,129 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [302268066] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:01:15,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2144249221] [2022-11-19 08:01:15,129 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:01:15,129 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:01:15,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:01:15,134 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:01:15,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-11-19 08:01:15,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:01:15,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 952 conjuncts, 110 conjunts are in the unsatisfiable core [2022-11-19 08:01:15,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:01:16,807 INFO L134 CoverageAnalysis]: Checked inductivity of 1445 backedges. 324 proven. 1120 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:01:16,807 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:01:18,360 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-19 08:01:19,063 INFO L134 CoverageAnalysis]: Checked inductivity of 1445 backedges. 324 proven. 1120 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:01:19,063 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2144249221] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:01:19,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1591392148] [2022-11-19 08:01:19,066 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:01:19,066 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:01:19,066 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:01:19,066 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:01:19,066 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:01:19,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:01:19,088 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 08:01:19,125 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:19,156 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:19,175 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:19,218 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 08:01:19,246 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:19,266 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:19,301 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:19,350 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 08:01:19,351 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 08:01:19,719 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:01:22,036 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36373#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 08:01:22,036 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:01:22,036 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:01:22,036 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 42, 42] total 85 [2022-11-19 08:01:22,036 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969610837] [2022-11-19 08:01:22,036 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:01:22,037 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2022-11-19 08:01:22,037 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:01:22,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2022-11-19 08:01:22,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1001, Invalid=8119, Unknown=0, NotChecked=0, Total=9120 [2022-11-19 08:01:22,038 INFO L87 Difference]: Start difference. First operand 166 states and 168 transitions. Second operand has 86 states, 85 states have (on average 3.8941176470588235) internal successors, (331), 86 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:01:24,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:01:24,823 INFO L93 Difference]: Finished difference Result 177 states and 179 transitions. [2022-11-19 08:01:24,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-19 08:01:24,826 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 85 states have (on average 3.8941176470588235) internal successors, (331), 86 states have internal predecessors, (331), 0 states have call successors, (0), 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 162 [2022-11-19 08:01:24,826 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:01:24,827 INFO L225 Difference]: With dead ends: 177 [2022-11-19 08:01:24,827 INFO L226 Difference]: Without dead ends: 175 [2022-11-19 08:01:24,827 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 547 GetRequests, 411 SyntacticMatches, 20 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5428 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=2200, Invalid=11606, Unknown=0, NotChecked=0, Total=13806 [2022-11-19 08:01:24,828 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 1016 mSDsluCounter, 981 mSDsCounter, 0 mSdLazyCounter, 3225 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1016 SdHoareTripleChecker+Valid, 1027 SdHoareTripleChecker+Invalid, 3247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 3225 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-11-19 08:01:24,828 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1016 Valid, 1027 Invalid, 3247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 3225 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-11-19 08:01:24,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2022-11-19 08:01:24,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 172. [2022-11-19 08:01:24,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 170 states have (on average 1.0235294117647058) internal successors, (174), 171 states have internal predecessors, (174), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:01:24,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 174 transitions. [2022-11-19 08:01:24,832 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 174 transitions. Word has length 162 [2022-11-19 08:01:24,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:01:24,832 INFO L495 AbstractCegarLoop]: Abstraction has 172 states and 174 transitions. [2022-11-19 08:01:24,832 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 85 states have (on average 3.8941176470588235) internal successors, (331), 86 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:01:24,832 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 174 transitions. [2022-11-19 08:01:24,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2022-11-19 08:01:24,833 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:01:24,833 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:01:24,840 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2022-11-19 08:01:25,037 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2022-11-19 08:01:25,038 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 08:01:25,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:01:25,038 INFO L85 PathProgramCache]: Analyzing trace with hash -1414958853, now seen corresponding path program 35 times [2022-11-19 08:01:25,038 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:01:25,038 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64486082] [2022-11-19 08:01:25,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:01:25,039 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:01:25,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:01:27,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1562 backedges. 98 proven. 1463 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:01:27,951 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:01:27,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64486082] [2022-11-19 08:01:27,951 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [64486082] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:01:27,951 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1570821800] [2022-11-19 08:01:27,951 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:01:27,951 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:01:27,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:01:27,952 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:01:27,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-11-19 08:01:33,285 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2022-11-19 08:01:33,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:01:33,298 INFO L263 TraceCheckSpWp]: Trace formula consists of 983 conjuncts, 139 conjunts are in the unsatisfiable core [2022-11-19 08:01:33,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:01:34,272 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:34,621 INFO L134 CoverageAnalysis]: Checked inductivity of 1562 backedges. 98 proven. 1463 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:01:34,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:01:34,885 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 08:01:34,887 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 16 treesize of output 12 [2022-11-19 08:01:35,172 INFO L134 CoverageAnalysis]: Checked inductivity of 1562 backedges. 98 proven. 1463 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:01:35,173 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1570821800] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:01:35,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1325257341] [2022-11-19 08:01:35,174 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:01:35,174 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:01:35,174 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:01:35,174 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:01:35,174 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:01:35,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:01:35,205 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 08:01:35,232 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:35,268 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:35,292 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:35,338 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 08:01:35,371 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:35,396 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:35,430 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:35,481 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 08:01:35,481 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 08:01:35,919 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:01:38,518 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37850#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 08:01:38,518 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:01:38,518 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:01:38,519 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45] total 72 [2022-11-19 08:01:38,519 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [429422043] [2022-11-19 08:01:38,519 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:01:38,519 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2022-11-19 08:01:38,519 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:01:38,519 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2022-11-19 08:01:38,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=6389, Unknown=0, NotChecked=0, Total=6642 [2022-11-19 08:01:38,520 INFO L87 Difference]: Start difference. First operand 172 states and 174 transitions. Second operand has 72 states, 72 states have (on average 3.1805555555555554) internal successors, (229), 72 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:01:44,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:01:44,299 INFO L93 Difference]: Finished difference Result 295 states and 297 transitions. [2022-11-19 08:01:44,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-11-19 08:01:44,300 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 3.1805555555555554) internal successors, (229), 72 states have internal predecessors, (229), 0 states have call successors, (0), 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 168 [2022-11-19 08:01:44,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:01:44,301 INFO L225 Difference]: With dead ends: 295 [2022-11-19 08:01:44,301 INFO L226 Difference]: Without dead ends: 175 [2022-11-19 08:01:44,302 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 590 GetRequests, 464 SyntacticMatches, 3 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 3138 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=669, Invalid=14831, Unknown=0, NotChecked=0, Total=15500 [2022-11-19 08:01:44,302 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 535 mSDsluCounter, 2091 mSDsCounter, 0 mSdLazyCounter, 6245 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 535 SdHoareTripleChecker+Valid, 2135 SdHoareTripleChecker+Invalid, 6394 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 6245 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 126 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:01:44,302 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [535 Valid, 2135 Invalid, 6394 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 6245 Invalid, 0 Unknown, 126 Unchecked, 3.1s Time] [2022-11-19 08:01:44,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2022-11-19 08:01:44,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 174. [2022-11-19 08:01:44,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 174 states, 172 states have (on average 1.0232558139534884) 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) [2022-11-19 08:01:44,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 174 states to 174 states and 176 transitions. [2022-11-19 08:01:44,305 INFO L78 Accepts]: Start accepts. Automaton has 174 states and 176 transitions. Word has length 168 [2022-11-19 08:01:44,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:01:44,306 INFO L495 AbstractCegarLoop]: Abstraction has 174 states and 176 transitions. [2022-11-19 08:01:44,306 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 3.1805555555555554) internal successors, (229), 72 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:01:44,306 INFO L276 IsEmpty]: Start isEmpty. Operand 174 states and 176 transitions. [2022-11-19 08:01:44,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2022-11-19 08:01:44,307 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:01:44,307 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:01:44,322 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2022-11-19 08:01:44,518 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2022-11-19 08:01:44,519 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 08:01:44,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:01:44,519 INFO L85 PathProgramCache]: Analyzing trace with hash -987745819, now seen corresponding path program 36 times [2022-11-19 08:01:44,519 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:01:44,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1018301394] [2022-11-19 08:01:44,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:01:44,519 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:01:44,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:01:47,291 INFO L134 CoverageAnalysis]: Checked inductivity of 1601 backedges. 324 proven. 1276 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:01:47,292 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:01:47,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1018301394] [2022-11-19 08:01:47,292 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1018301394] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:01:47,292 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [601714042] [2022-11-19 08:01:47,292 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:01:47,292 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:01:47,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:01:47,293 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:01:47,295 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-11-19 08:01:49,284 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:01:49,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:01:49,293 INFO L263 TraceCheckSpWp]: Trace formula consists of 996 conjuncts, 120 conjunts are in the unsatisfiable core [2022-11-19 08:01:49,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:01:49,312 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-19 08:01:49,312 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-19 08:01:50,934 INFO L134 CoverageAnalysis]: Checked inductivity of 1601 backedges. 361 proven. 1239 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:01:50,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:01:54,794 INFO L134 CoverageAnalysis]: Checked inductivity of 1601 backedges. 361 proven. 1239 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:01:54,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [601714042] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:01:54,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1318522776] [2022-11-19 08:01:54,795 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:01:54,795 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:01:54,795 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:01:54,795 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:01:54,795 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:01:54,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:01:54,827 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 08:01:54,854 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 08:01:54,894 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:54,920 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:54,960 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 08:01:55,031 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-19 08:01:55,032 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2022-11-19 08:01:55,083 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:55,103 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:01:55,184 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-19 08:01:55,184 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-11-19 08:01:55,356 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-19 08:01:55,357 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-19 08:01:57,702 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:02:01,503 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39540#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.offset|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#NULL.offset|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 08:02:01,503 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:02:01,503 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:02:01,503 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43] total 109 [2022-11-19 08:02:01,503 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563379362] [2022-11-19 08:02:01,503 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:02:01,504 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 111 states [2022-11-19 08:02:01,504 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:02:01,504 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 111 interpolants. [2022-11-19 08:02:01,505 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1836, Invalid=12684, Unknown=0, NotChecked=0, Total=14520 [2022-11-19 08:02:01,505 INFO L87 Difference]: Start difference. First operand 174 states and 176 transitions. Second operand has 111 states, 110 states have (on average 3.5727272727272728) internal successors, (393), 110 states have internal predecessors, (393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:02:05,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:02:05,009 INFO L93 Difference]: Finished difference Result 185 states and 187 transitions. [2022-11-19 08:02:05,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-11-19 08:02:05,010 INFO L78 Accepts]: Start accepts. Automaton has has 111 states, 110 states have (on average 3.5727272727272728) internal successors, (393), 110 states have internal predecessors, (393), 0 states have call successors, (0), 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 170 [2022-11-19 08:02:05,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:02:05,011 INFO L225 Difference]: With dead ends: 185 [2022-11-19 08:02:05,011 INFO L226 Difference]: Without dead ends: 183 [2022-11-19 08:02:05,013 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 574 GetRequests, 432 SyntacticMatches, 0 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6621 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=3674, Invalid=16918, Unknown=0, NotChecked=0, Total=20592 [2022-11-19 08:02:05,013 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 772 mSDsluCounter, 1001 mSDsCounter, 0 mSdLazyCounter, 3413 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 772 SdHoareTripleChecker+Valid, 1046 SdHoareTripleChecker+Invalid, 3439 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 3413 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-11-19 08:02:05,013 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [772 Valid, 1046 Invalid, 3439 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 3413 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-11-19 08:02:05,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2022-11-19 08:02:05,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 180. [2022-11-19 08:02:05,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 180 states, 178 states have (on average 1.0224719101123596) internal successors, (182), 179 states have internal predecessors, (182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:02:05,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 182 transitions. [2022-11-19 08:02:05,017 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 182 transitions. Word has length 170 [2022-11-19 08:02:05,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:02:05,017 INFO L495 AbstractCegarLoop]: Abstraction has 180 states and 182 transitions. [2022-11-19 08:02:05,018 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 111 states, 110 states have (on average 3.5727272727272728) internal successors, (393), 110 states have internal predecessors, (393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:02:05,018 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 182 transitions. [2022-11-19 08:02:05,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2022-11-19 08:02:05,019 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:02:05,019 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 21, 21, 21, 21, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:02:05,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2022-11-19 08:02:05,220 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2022-11-19 08:02:05,220 INFO L420 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 08:02:05,220 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:02:05,220 INFO L85 PathProgramCache]: Analyzing trace with hash -1583763067, now seen corresponding path program 37 times [2022-11-19 08:02:05,220 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:02:05,220 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [728737453] [2022-11-19 08:02:05,221 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:02:05,221 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:02:05,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:02:08,064 INFO L134 CoverageAnalysis]: Checked inductivity of 1724 backedges. 103 proven. 1620 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:02:08,064 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:02:08,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [728737453] [2022-11-19 08:02:08,064 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [728737453] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:02:08,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [772061302] [2022-11-19 08:02:08,064 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:02:08,064 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:02:08,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:02:08,065 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:02:08,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-11-19 08:02:08,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:02:08,484 INFO L263 TraceCheckSpWp]: Trace formula consists of 1027 conjuncts, 145 conjunts are in the unsatisfiable core [2022-11-19 08:02:08,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:02:09,528 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:09,917 INFO L134 CoverageAnalysis]: Checked inductivity of 1724 backedges. 103 proven. 1620 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:02:09,918 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:02:10,195 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 08:02:10,197 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 16 treesize of output 12 [2022-11-19 08:02:10,503 INFO L134 CoverageAnalysis]: Checked inductivity of 1724 backedges. 103 proven. 1620 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:02:10,503 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [772061302] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:02:10,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [121135094] [2022-11-19 08:02:10,504 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:02:10,504 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:02:10,505 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:02:10,505 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:02:10,505 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:02:10,531 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:02:10,535 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 08:02:10,584 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:10,619 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:10,643 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:10,683 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 08:02:10,720 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:10,743 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:10,787 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:10,826 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 08:02:10,826 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 08:02:11,207 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:02:14,102 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41086#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 08:02:14,102 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:02:14,102 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:02:14,102 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 75 [2022-11-19 08:02:14,102 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [325249888] [2022-11-19 08:02:14,102 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:02:14,103 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2022-11-19 08:02:14,103 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:02:14,103 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2022-11-19 08:02:14,103 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=6879, Unknown=0, NotChecked=0, Total=7140 [2022-11-19 08:02:14,104 INFO L87 Difference]: Start difference. First operand 180 states and 182 transitions. Second operand has 75 states, 75 states have (on average 3.1866666666666665) internal successors, (239), 75 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:02:20,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:02:20,399 INFO L93 Difference]: Finished difference Result 309 states and 311 transitions. [2022-11-19 08:02:20,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2022-11-19 08:02:20,400 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 75 states have (on average 3.1866666666666665) internal successors, (239), 75 states have internal predecessors, (239), 0 states have call successors, (0), 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 176 [2022-11-19 08:02:20,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:02:20,401 INFO L225 Difference]: With dead ends: 309 [2022-11-19 08:02:20,401 INFO L226 Difference]: Without dead ends: 183 [2022-11-19 08:02:20,402 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 618 GetRequests, 487 SyntacticMatches, 3 SemanticMatches, 128 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 3380 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=696, Invalid=16074, Unknown=0, NotChecked=0, Total=16770 [2022-11-19 08:02:20,402 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 441 mSDsluCounter, 2311 mSDsCounter, 0 mSdLazyCounter, 6907 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 441 SdHoareTripleChecker+Valid, 2357 SdHoareTripleChecker+Invalid, 7036 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 6907 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 104 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-11-19 08:02:20,402 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [441 Valid, 2357 Invalid, 7036 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 6907 Invalid, 0 Unknown, 104 Unchecked, 3.4s Time] [2022-11-19 08:02:20,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2022-11-19 08:02:20,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 182. [2022-11-19 08:02:20,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 180 states have (on average 1.0222222222222221) internal successors, (184), 181 states have internal predecessors, (184), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:02:20,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 184 transitions. [2022-11-19 08:02:20,406 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 184 transitions. Word has length 176 [2022-11-19 08:02:20,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:02:20,406 INFO L495 AbstractCegarLoop]: Abstraction has 182 states and 184 transitions. [2022-11-19 08:02:20,406 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 75 states have (on average 3.1866666666666665) internal successors, (239), 75 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:02:20,407 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 184 transitions. [2022-11-19 08:02:20,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-11-19 08:02:20,408 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:02:20,408 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:02:20,417 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2022-11-19 08:02:20,616 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:02:20,617 INFO L420 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 08:02:20,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:02:20,617 INFO L85 PathProgramCache]: Analyzing trace with hash -1092753297, now seen corresponding path program 38 times [2022-11-19 08:02:20,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:02:20,617 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [680092550] [2022-11-19 08:02:20,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:02:20,617 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:02:20,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:02:23,607 INFO L134 CoverageAnalysis]: Checked inductivity of 1765 backedges. 361 proven. 1403 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:02:23,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:02:23,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [680092550] [2022-11-19 08:02:23,607 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [680092550] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:02:23,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1568725359] [2022-11-19 08:02:23,608 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:02:23,608 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:02:23,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:02:23,609 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:02:23,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-11-19 08:02:25,773 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2022-11-19 08:02:25,773 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:02:25,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 1040 conjuncts, 100 conjunts are in the unsatisfiable core [2022-11-19 08:02:25,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:02:28,460 INFO L134 CoverageAnalysis]: Checked inductivity of 1765 backedges. 400 proven. 1364 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:02:28,460 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:02:30,829 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2022-11-19 08:02:31,789 INFO L134 CoverageAnalysis]: Checked inductivity of 1765 backedges. 400 proven. 1364 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:02:31,789 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1568725359] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:02:31,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [992766240] [2022-11-19 08:02:31,790 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:02:31,790 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:02:31,790 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:02:31,790 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:02:31,791 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:02:31,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:02:31,818 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 08:02:31,840 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:31,875 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:31,898 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:31,945 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:31,977 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:32,013 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:32,034 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:32,071 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:32,112 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 08:02:32,112 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 08:02:32,479 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:02:34,941 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42854#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 08:02:34,941 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:02:34,941 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:02:34,941 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 46, 46] total 114 [2022-11-19 08:02:34,942 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800523579] [2022-11-19 08:02:34,942 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:02:34,942 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2022-11-19 08:02:34,942 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:02:34,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2022-11-19 08:02:34,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2135, Invalid=13365, Unknown=0, NotChecked=0, Total=15500 [2022-11-19 08:02:34,944 INFO L87 Difference]: Start difference. First operand 182 states and 184 transitions. Second operand has 115 states, 114 states have (on average 4.2631578947368425) internal successors, (486), 115 states have internal predecessors, (486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:02:37,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:02:37,963 INFO L93 Difference]: Finished difference Result 193 states and 195 transitions. [2022-11-19 08:02:37,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-11-19 08:02:37,964 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 114 states have (on average 4.2631578947368425) internal successors, (486), 115 states have internal predecessors, (486), 0 states have call successors, (0), 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 178 [2022-11-19 08:02:37,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:02:37,965 INFO L225 Difference]: With dead ends: 193 [2022-11-19 08:02:37,965 INFO L226 Difference]: Without dead ends: 191 [2022-11-19 08:02:37,966 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 432 SyntacticMatches, 22 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9242 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=3854, Invalid=18198, Unknown=0, NotChecked=0, Total=22052 [2022-11-19 08:02:37,967 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 690 mSDsluCounter, 739 mSDsCounter, 0 mSdLazyCounter, 2318 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 690 SdHoareTripleChecker+Valid, 786 SdHoareTripleChecker+Invalid, 2348 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 2318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-19 08:02:37,967 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [690 Valid, 786 Invalid, 2348 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 2318 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-19 08:02:37,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2022-11-19 08:02:37,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 188. [2022-11-19 08:02:37,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 188 states, 186 states have (on average 1.021505376344086) internal successors, (190), 187 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:02:37,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 188 states to 188 states and 190 transitions. [2022-11-19 08:02:37,969 INFO L78 Accepts]: Start accepts. Automaton has 188 states and 190 transitions. Word has length 178 [2022-11-19 08:02:37,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:02:37,969 INFO L495 AbstractCegarLoop]: Abstraction has 188 states and 190 transitions. [2022-11-19 08:02:37,970 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 114 states have (on average 4.2631578947368425) internal successors, (486), 115 states have internal predecessors, (486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:02:37,970 INFO L276 IsEmpty]: Start isEmpty. Operand 188 states and 190 transitions. [2022-11-19 08:02:37,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2022-11-19 08:02:37,971 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:02:37,971 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:02:37,981 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2022-11-19 08:02:38,172 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:02:38,172 INFO L420 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 08:02:38,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:02:38,172 INFO L85 PathProgramCache]: Analyzing trace with hash -875374449, now seen corresponding path program 39 times [2022-11-19 08:02:38,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:02:38,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [544304513] [2022-11-19 08:02:38,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:02:38,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:02:38,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:02:41,253 INFO L134 CoverageAnalysis]: Checked inductivity of 1894 backedges. 108 proven. 1785 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:02:41,254 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:02:41,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [544304513] [2022-11-19 08:02:41,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [544304513] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:02:41,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1133947658] [2022-11-19 08:02:41,254 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:02:41,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:02:41,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:02:41,258 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:02:41,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-11-19 08:02:42,440 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:02:42,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:02:42,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 1071 conjuncts, 149 conjunts are in the unsatisfiable core [2022-11-19 08:02:42,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:02:43,683 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:44,102 INFO L134 CoverageAnalysis]: Checked inductivity of 1894 backedges. 108 proven. 1785 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:02:44,102 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:02:44,412 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 08:02:44,413 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 16 treesize of output 12 [2022-11-19 08:02:44,710 INFO L134 CoverageAnalysis]: Checked inductivity of 1894 backedges. 108 proven. 1785 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:02:44,710 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1133947658] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:02:44,710 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [265944872] [2022-11-19 08:02:44,711 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:02:44,711 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:02:44,711 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:02:44,711 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:02:44,711 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:02:44,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:02:44,737 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 08:02:44,762 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 08:02:44,800 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:44,833 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:44,867 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 08:02:44,921 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-19 08:02:44,921 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2022-11-19 08:02:44,962 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:44,986 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:02:45,082 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-19 08:02:45,082 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-11-19 08:02:45,250 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-19 08:02:45,250 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-19 08:02:46,740 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:02:50,427 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44469#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 08:02:50,427 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:02:50,427 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:02:50,427 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 78 [2022-11-19 08:02:50,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575348128] [2022-11-19 08:02:50,427 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:02:50,428 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 78 states [2022-11-19 08:02:50,428 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:02:50,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 78 interpolants. [2022-11-19 08:02:50,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=7392, Unknown=0, NotChecked=0, Total=7656 [2022-11-19 08:02:50,430 INFO L87 Difference]: Start difference. First operand 188 states and 190 transitions. Second operand has 78 states, 78 states have (on average 3.1923076923076925) internal successors, (249), 78 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:02:57,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:02:57,474 INFO L93 Difference]: Finished difference Result 323 states and 325 transitions. [2022-11-19 08:02:57,474 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-11-19 08:02:57,475 INFO L78 Accepts]: Start accepts. Automaton has has 78 states, 78 states have (on average 3.1923076923076925) internal successors, (249), 78 states have internal predecessors, (249), 0 states have call successors, (0), 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 184 [2022-11-19 08:02:57,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:02:57,475 INFO L225 Difference]: With dead ends: 323 [2022-11-19 08:02:57,475 INFO L226 Difference]: Without dead ends: 191 [2022-11-19 08:02:57,476 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 646 GetRequests, 510 SyntacticMatches, 3 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 3630 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=718, Invalid=17372, Unknown=0, NotChecked=0, Total=18090 [2022-11-19 08:02:57,476 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 324 mSDsluCounter, 2563 mSDsCounter, 0 mSdLazyCounter, 7682 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 324 SdHoareTripleChecker+Valid, 2611 SdHoareTripleChecker+Invalid, 7765 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 7682 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2022-11-19 08:02:57,476 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [324 Valid, 2611 Invalid, 7765 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 7682 Invalid, 0 Unknown, 59 Unchecked, 3.9s Time] [2022-11-19 08:02:57,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2022-11-19 08:02:57,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 190. [2022-11-19 08:02:57,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 190 states, 188 states have (on average 1.0212765957446808) internal successors, (192), 189 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:02:57,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 192 transitions. [2022-11-19 08:02:57,480 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 192 transitions. Word has length 184 [2022-11-19 08:02:57,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:02:57,480 INFO L495 AbstractCegarLoop]: Abstraction has 190 states and 192 transitions. [2022-11-19 08:02:57,481 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 78 states, 78 states have (on average 3.1923076923076925) internal successors, (249), 78 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:02:57,481 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 192 transitions. [2022-11-19 08:02:57,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2022-11-19 08:02:57,482 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:02:57,482 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:02:57,490 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2022-11-19 08:02:57,685 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable62 [2022-11-19 08:02:57,686 INFO L420 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 08:02:57,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:02:57,686 INFO L85 PathProgramCache]: Analyzing trace with hash 1527678329, now seen corresponding path program 40 times [2022-11-19 08:02:57,686 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:02:57,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [140596083] [2022-11-19 08:02:57,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:02:57,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:02:57,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:03:00,463 INFO L134 CoverageAnalysis]: Checked inductivity of 1937 backedges. 400 proven. 1536 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:03:00,463 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:03:00,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [140596083] [2022-11-19 08:03:00,463 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [140596083] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:03:00,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1372341216] [2022-11-19 08:03:00,463 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:03:00,463 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:03:00,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:03:00,466 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:03:00,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-11-19 08:03:00,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:03:00,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 1084 conjuncts, 125 conjunts are in the unsatisfiable core [2022-11-19 08:03:00,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:03:02,474 INFO L134 CoverageAnalysis]: Checked inductivity of 1937 backedges. 441 proven. 1495 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:03:02,474 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:03:04,362 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-19 08:03:05,281 INFO L134 CoverageAnalysis]: Checked inductivity of 1937 backedges. 441 proven. 1495 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:03:05,281 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1372341216] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:03:05,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1657290623] [2022-11-19 08:03:05,282 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:03:05,282 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:03:05,283 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:03:05,283 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:03:05,283 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:03:05,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:03:05,313 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 08:03:05,339 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:05,374 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:05,403 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:05,441 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:05,483 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:05,518 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:05,539 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:05,571 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:05,617 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 08:03:05,618 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 08:03:05,992 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:03:08,569 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '46294#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 08:03:08,569 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:03:08,569 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:03:08,569 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 48, 48] total 97 [2022-11-19 08:03:08,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [232574526] [2022-11-19 08:03:08,569 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:03:08,570 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2022-11-19 08:03:08,570 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:03:08,571 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2022-11-19 08:03:08,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=10279, Unknown=0, NotChecked=0, Total=11556 [2022-11-19 08:03:08,572 INFO L87 Difference]: Start difference. First operand 190 states and 192 transitions. Second operand has 98 states, 97 states have (on average 3.9072164948453607) internal successors, (379), 98 states have internal predecessors, (379), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:03:12,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:03:12,008 INFO L93 Difference]: Finished difference Result 201 states and 203 transitions. [2022-11-19 08:03:12,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-19 08:03:12,009 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 97 states have (on average 3.9072164948453607) internal successors, (379), 98 states have internal predecessors, (379), 0 states have call successors, (0), 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 186 [2022-11-19 08:03:12,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:03:12,010 INFO L225 Difference]: With dead ends: 201 [2022-11-19 08:03:12,010 INFO L226 Difference]: Without dead ends: 199 [2022-11-19 08:03:12,011 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 628 GetRequests, 474 SyntacticMatches, 23 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6964 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=2827, Invalid=14729, Unknown=0, NotChecked=0, Total=17556 [2022-11-19 08:03:12,012 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 1468 mSDsluCounter, 1341 mSDsCounter, 0 mSdLazyCounter, 4433 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1468 SdHoareTripleChecker+Valid, 1393 SdHoareTripleChecker+Invalid, 4455 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 4433 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2022-11-19 08:03:12,012 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1468 Valid, 1393 Invalid, 4455 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 4433 Invalid, 0 Unknown, 0 Unchecked, 2.4s Time] [2022-11-19 08:03:12,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2022-11-19 08:03:12,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 196. [2022-11-19 08:03:12,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 194 states have (on average 1.0206185567010309) internal successors, (198), 195 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:03:12,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 198 transitions. [2022-11-19 08:03:12,015 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 198 transitions. Word has length 186 [2022-11-19 08:03:12,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:03:12,015 INFO L495 AbstractCegarLoop]: Abstraction has 196 states and 198 transitions. [2022-11-19 08:03:12,016 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 97 states have (on average 3.9072164948453607) internal successors, (379), 98 states have internal predecessors, (379), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:03:12,016 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 198 transitions. [2022-11-19 08:03:12,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2022-11-19 08:03:12,017 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:03:12,017 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 23, 23, 23, 23, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:03:12,030 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2022-11-19 08:03:12,225 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2022-11-19 08:03:12,225 INFO L420 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 08:03:12,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:03:12,226 INFO L85 PathProgramCache]: Analyzing trace with hash -950532583, now seen corresponding path program 41 times [2022-11-19 08:03:12,226 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:03:12,226 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1717624729] [2022-11-19 08:03:12,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:03:12,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:03:12,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:03:15,427 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 113 proven. 1958 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:03:15,428 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:03:15,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1717624729] [2022-11-19 08:03:15,428 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1717624729] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:03:15,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1977024994] [2022-11-19 08:03:15,428 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:03:15,428 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:03:15,428 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:03:15,429 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:03:15,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-11-19 08:03:19,293 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2022-11-19 08:03:19,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:03:19,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 1115 conjuncts, 157 conjunts are in the unsatisfiable core [2022-11-19 08:03:19,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:03:20,435 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:20,839 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 113 proven. 1958 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:03:20,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:03:21,129 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 08:03:21,131 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 16 treesize of output 12 [2022-11-19 08:03:21,446 INFO L134 CoverageAnalysis]: Checked inductivity of 2072 backedges. 113 proven. 1958 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:03:21,446 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1977024994] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:03:21,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [679909567] [2022-11-19 08:03:21,447 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:03:21,447 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:03:21,447 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:03:21,447 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:03:21,448 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:03:21,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:03:21,474 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 08:03:21,499 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 08:03:21,541 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:21,572 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:21,612 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 08:03:21,663 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-11-19 08:03:21,664 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 89 [2022-11-19 08:03:21,709 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:21,732 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:21,824 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-11-19 08:03:21,824 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-11-19 08:03:21,975 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-11-19 08:03:21,975 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 328 treesize of output 343 [2022-11-19 08:03:23,944 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:03:27,826 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47978#(and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |#NULL.base| 0) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.offset|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (<= 0 |#NULL.offset|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 08:03:27,826 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:03:27,826 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:03:27,826 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 81 [2022-11-19 08:03:27,826 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331359786] [2022-11-19 08:03:27,827 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:03:27,827 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2022-11-19 08:03:27,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:03:27,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2022-11-19 08:03:27,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=272, Invalid=7918, Unknown=0, NotChecked=0, Total=8190 [2022-11-19 08:03:27,828 INFO L87 Difference]: Start difference. First operand 196 states and 198 transitions. Second operand has 81 states, 81 states have (on average 3.197530864197531) internal successors, (259), 81 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:03:35,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:03:35,035 INFO L93 Difference]: Finished difference Result 337 states and 339 transitions. [2022-11-19 08:03:35,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2022-11-19 08:03:35,035 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 81 states have (on average 3.197530864197531) internal successors, (259), 81 states have internal predecessors, (259), 0 states have call successors, (0), 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 192 [2022-11-19 08:03:35,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:03:35,037 INFO L225 Difference]: With dead ends: 337 [2022-11-19 08:03:35,037 INFO L226 Difference]: Without dead ends: 199 [2022-11-19 08:03:35,038 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 674 GetRequests, 533 SyntacticMatches, 3 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 3890 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=745, Invalid=18715, Unknown=0, NotChecked=0, Total=19460 [2022-11-19 08:03:35,039 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 338 mSDsluCounter, 2775 mSDsCounter, 0 mSdLazyCounter, 8339 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 338 SdHoareTripleChecker+Valid, 2825 SdHoareTripleChecker+Invalid, 8509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 8339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 145 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:03:35,039 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [338 Valid, 2825 Invalid, 8509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 8339 Invalid, 0 Unknown, 145 Unchecked, 4.0s Time] [2022-11-19 08:03:35,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2022-11-19 08:03:35,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 198. [2022-11-19 08:03:35,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 198 states, 196 states have (on average 1.0204081632653061) internal successors, (200), 197 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:03:35,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 200 transitions. [2022-11-19 08:03:35,043 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 200 transitions. Word has length 192 [2022-11-19 08:03:35,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:03:35,043 INFO L495 AbstractCegarLoop]: Abstraction has 198 states and 200 transitions. [2022-11-19 08:03:35,043 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 81 states have (on average 3.197530864197531) internal successors, (259), 81 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:03:35,043 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 200 transitions. [2022-11-19 08:03:35,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2022-11-19 08:03:35,044 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:03:35,044 INFO L195 NwaCegarLoop]: trace histogram [24, 24, 23, 23, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:03:35,055 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2022-11-19 08:03:35,253 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:03:35,254 INFO L420 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 08:03:35,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:03:35,254 INFO L85 PathProgramCache]: Analyzing trace with hash 1823811843, now seen corresponding path program 42 times [2022-11-19 08:03:35,254 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:03:35,254 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [492393214] [2022-11-19 08:03:35,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:03:35,254 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:03:35,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:03:38,090 INFO L134 CoverageAnalysis]: Checked inductivity of 2117 backedges. 441 proven. 1675 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:03:38,090 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:03:38,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [492393214] [2022-11-19 08:03:38,090 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [492393214] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:03:38,090 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [121105695] [2022-11-19 08:03:38,090 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:03:38,090 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:03:38,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:03:38,091 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:03:38,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-11-19 08:03:40,582 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:03:40,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:03:40,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 1128 conjuncts, 135 conjunts are in the unsatisfiable core [2022-11-19 08:03:40,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:03:40,609 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-19 08:03:40,609 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-19 08:03:42,455 INFO L134 CoverageAnalysis]: Checked inductivity of 2117 backedges. 484 proven. 1632 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:03:42,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:03:46,914 INFO L134 CoverageAnalysis]: Checked inductivity of 2117 backedges. 484 proven. 1632 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:03:46,914 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [121105695] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:03:46,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1247059644] [2022-11-19 08:03:46,915 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:03:46,915 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:03:46,915 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:03:46,916 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:03:46,916 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:03:46,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:03:46,947 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 08:03:46,975 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-19 08:03:47,008 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:47,039 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:47,102 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:47,142 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 83 [2022-11-19 08:03:47,187 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:47,219 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:47,255 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:03:47,300 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 08:03:47,301 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 08:03:47,644 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:03:50,646 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '49905#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 08:03:50,646 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:03:50,646 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:03:50,646 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 124 [2022-11-19 08:03:50,646 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266609419] [2022-11-19 08:03:50,646 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:03:50,647 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 126 states [2022-11-19 08:03:50,647 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:03:50,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 126 interpolants. [2022-11-19 08:03:50,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2352, Invalid=16008, Unknown=0, NotChecked=0, Total=18360 [2022-11-19 08:03:50,648 INFO L87 Difference]: Start difference. First operand 198 states and 200 transitions. Second operand has 126 states, 125 states have (on average 3.576) internal successors, (447), 125 states have internal predecessors, (447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:03:54,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:03:54,947 INFO L93 Difference]: Finished difference Result 209 states and 211 transitions. [2022-11-19 08:03:54,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-11-19 08:03:54,947 INFO L78 Accepts]: Start accepts. Automaton has has 126 states, 125 states have (on average 3.576) internal successors, (447), 125 states have internal predecessors, (447), 0 states have call successors, (0), 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 194 [2022-11-19 08:03:54,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:03:54,948 INFO L225 Difference]: With dead ends: 209 [2022-11-19 08:03:54,948 INFO L226 Difference]: Without dead ends: 207 [2022-11-19 08:03:54,950 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 655 GetRequests, 495 SyntacticMatches, 0 SemanticMatches, 160 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8369 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=4703, Invalid=21379, Unknown=0, NotChecked=0, Total=26082 [2022-11-19 08:03:54,950 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 1359 mSDsluCounter, 1433 mSDsCounter, 0 mSdLazyCounter, 4864 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1359 SdHoareTripleChecker+Valid, 1487 SdHoareTripleChecker+Invalid, 4893 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 4864 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-11-19 08:03:54,951 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1359 Valid, 1487 Invalid, 4893 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 4864 Invalid, 0 Unknown, 0 Unchecked, 3.0s Time] [2022-11-19 08:03:54,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2022-11-19 08:03:54,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 204. [2022-11-19 08:03:54,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 204 states, 202 states have (on average 1.0198019801980198) internal successors, (206), 203 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:03:54,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 206 transitions. [2022-11-19 08:03:54,954 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 206 transitions. Word has length 194 [2022-11-19 08:03:54,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:03:54,955 INFO L495 AbstractCegarLoop]: Abstraction has 204 states and 206 transitions. [2022-11-19 08:03:54,955 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 126 states, 125 states have (on average 3.576) internal successors, (447), 125 states have internal predecessors, (447), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:03:54,955 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 206 transitions. [2022-11-19 08:03:54,956 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2022-11-19 08:03:54,956 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:03:54,956 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:03:54,967 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2022-11-19 08:03:55,167 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:03:55,167 INFO L420 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 08:03:55,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:03:55,167 INFO L85 PathProgramCache]: Analyzing trace with hash -1605084637, now seen corresponding path program 43 times [2022-11-19 08:03:55,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:03:55,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629048964] [2022-11-19 08:03:55,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:03:55,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:03:55,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:03:58,489 INFO L134 CoverageAnalysis]: Checked inductivity of 2258 backedges. 118 proven. 2139 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:03:58,489 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:03:58,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629048964] [2022-11-19 08:03:58,490 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1629048964] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:03:58,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1419264940] [2022-11-19 08:03:58,490 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 08:03:58,490 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:03:58,490 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:03:58,491 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:03:58,493 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-11-19 08:03:58,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:03:58,986 INFO L263 TraceCheckSpWp]: Trace formula consists of 1159 conjuncts, 163 conjunts are in the unsatisfiable core [2022-11-19 08:03:58,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:04:00,300 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:00,720 INFO L134 CoverageAnalysis]: Checked inductivity of 2258 backedges. 118 proven. 2139 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:04:00,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:04:01,038 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 08:04:01,040 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 16 treesize of output 12 [2022-11-19 08:04:01,366 INFO L134 CoverageAnalysis]: Checked inductivity of 2258 backedges. 118 proven. 2139 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:04:01,366 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1419264940] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:04:01,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1396816881] [2022-11-19 08:04:01,367 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:04:01,367 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:04:01,367 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:04:01,368 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:04:01,368 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:04:01,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:04:01,388 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 08:04:01,421 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:01,452 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:01,469 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:01,518 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:01,578 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:01,619 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:01,636 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:01,669 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:01,712 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 08:04:01,712 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 08:04:02,063 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:04:04,964 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '51658#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 08:04:04,965 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:04:04,965 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:04:04,965 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 84 [2022-11-19 08:04:04,965 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462008857] [2022-11-19 08:04:04,965 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:04:04,965 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-11-19 08:04:04,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:04:04,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-11-19 08:04:04,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=285, Invalid=8457, Unknown=0, NotChecked=0, Total=8742 [2022-11-19 08:04:04,966 INFO L87 Difference]: Start difference. First operand 204 states and 206 transitions. Second operand has 84 states, 84 states have (on average 3.2023809523809526) internal successors, (269), 84 states have internal predecessors, (269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:04:13,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:04:13,455 INFO L93 Difference]: Finished difference Result 351 states and 353 transitions. [2022-11-19 08:04:13,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2022-11-19 08:04:13,456 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 3.2023809523809526) internal successors, (269), 84 states have internal predecessors, (269), 0 states have call successors, (0), 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 200 [2022-11-19 08:04:13,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:04:13,457 INFO L225 Difference]: With dead ends: 351 [2022-11-19 08:04:13,457 INFO L226 Difference]: Without dead ends: 207 [2022-11-19 08:04:13,458 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 702 GetRequests, 556 SyntacticMatches, 3 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 4160 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=777, Invalid=20103, Unknown=0, NotChecked=0, Total=20880 [2022-11-19 08:04:13,459 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 494 mSDsluCounter, 3191 mSDsCounter, 0 mSdLazyCounter, 9511 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 494 SdHoareTripleChecker+Valid, 3243 SdHoareTripleChecker+Invalid, 9679 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 9511 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 142 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2022-11-19 08:04:13,459 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [494 Valid, 3243 Invalid, 9679 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [26 Valid, 9511 Invalid, 0 Unknown, 142 Unchecked, 4.8s Time] [2022-11-19 08:04:13,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2022-11-19 08:04:13,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 206. [2022-11-19 08:04:13,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 206 states, 204 states have (on average 1.0196078431372548) internal successors, (208), 205 states have internal predecessors, (208), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:04:13,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 208 transitions. [2022-11-19 08:04:13,462 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 208 transitions. Word has length 200 [2022-11-19 08:04:13,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:04:13,463 INFO L495 AbstractCegarLoop]: Abstraction has 206 states and 208 transitions. [2022-11-19 08:04:13,463 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 3.2023809523809526) internal successors, (269), 84 states have internal predecessors, (269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:04:13,463 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 208 transitions. [2022-11-19 08:04:13,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2022-11-19 08:04:13,464 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:04:13,464 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:04:13,472 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2022-11-19 08:04:13,664 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2022-11-19 08:04:13,665 INFO L420 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 08:04:13,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:04:13,665 INFO L85 PathProgramCache]: Analyzing trace with hash 905769741, now seen corresponding path program 44 times [2022-11-19 08:04:13,665 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:04:13,665 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236111562] [2022-11-19 08:04:13,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:13,665 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:04:13,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:04:16,871 INFO L134 CoverageAnalysis]: Checked inductivity of 2305 backedges. 484 proven. 1820 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:04:16,871 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:04:16,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236111562] [2022-11-19 08:04:16,871 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1236111562] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:04:16,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2095628079] [2022-11-19 08:04:16,872 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 08:04:16,872 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:16,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:04:16,873 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:04:16,875 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2022-11-19 08:04:22,987 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2022-11-19 08:04:22,987 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:04:23,002 INFO L263 TraceCheckSpWp]: Trace formula consists of 1172 conjuncts, 113 conjunts are in the unsatisfiable core [2022-11-19 08:04:23,005 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:04:23,019 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-19 08:04:23,019 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 9 treesize of output 15 [2022-11-19 08:04:26,330 INFO L134 CoverageAnalysis]: Checked inductivity of 2305 backedges. 529 proven. 1775 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:04:26,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:04:31,180 INFO L134 CoverageAnalysis]: Checked inductivity of 2305 backedges. 529 proven. 1775 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:04:31,180 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2095628079] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:04:31,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [271220394] [2022-11-19 08:04:31,181 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:04:31,181 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:04:31,182 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:04:31,182 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:04:31,182 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:04:31,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:04:31,210 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 08:04:31,234 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:31,274 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:31,295 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:31,343 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:31,410 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:31,436 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:31,457 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:31,489 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:31,536 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 08:04:31,536 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 08:04:31,914 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-19 08:04:35,142 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53688#(and (<= 0 |ULTIMATE.start_subseq_~pt~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= 0 |ULTIMATE.start_subseq_#in~t#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_subseq_~s#1.offset|) (<= |ULTIMATE.start_subseq_#in~t#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_~t#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 0 |ULTIMATE.start_subseq_~s#1.base|) (<= 0 |ULTIMATE.start_subseq_~pt~0#1.offset|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_subseq_~s#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_subseq_~t#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (<= |ULTIMATE.start_subseq_~t#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.base|) (<= |ULTIMATE.start_subseq_#in~s#1.offset| 0) (<= 0 |ULTIMATE.start_subseq_#in~s#1.offset|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.base|) (< (select |#length| |ULTIMATE.start_subseq_~pt~0#1.base|) (+ |ULTIMATE.start_subseq_~pt~0#1.offset| 1)) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_subseq_~ps~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_subseq_#in~t#1.base|))' at error location [2022-11-19 08:04:35,142 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-19 08:04:35,142 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 08:04:35,142 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 52, 52] total 154 [2022-11-19 08:04:35,142 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452770917] [2022-11-19 08:04:35,142 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 08:04:35,143 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 155 states [2022-11-19 08:04:35,143 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 08:04:35,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2022-11-19 08:04:35,145 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3663, Invalid=23397, Unknown=0, NotChecked=0, Total=27060 [2022-11-19 08:04:35,145 INFO L87 Difference]: Start difference. First operand 206 states and 208 transitions. Second operand has 155 states, 154 states have (on average 3.9155844155844157) internal successors, (603), 155 states have internal predecessors, (603), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:04:38,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 08:04:38,049 INFO L93 Difference]: Finished difference Result 217 states and 219 transitions. [2022-11-19 08:04:38,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-11-19 08:04:38,050 INFO L78 Accepts]: Start accepts. Automaton has has 155 states, 154 states have (on average 3.9155844155844157) internal successors, (603), 155 states have internal predecessors, (603), 0 states have call successors, (0), 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 202 [2022-11-19 08:04:38,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 08:04:38,051 INFO L225 Difference]: With dead ends: 217 [2022-11-19 08:04:38,051 INFO L226 Difference]: Without dead ends: 215 [2022-11-19 08:04:38,054 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 492 SyntacticMatches, 0 SemanticMatches, 190 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13092 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=6516, Invalid=30156, Unknown=0, NotChecked=0, Total=36672 [2022-11-19 08:04:38,054 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 1754 mSDsluCounter, 951 mSDsCounter, 0 mSdLazyCounter, 2903 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1754 SdHoareTripleChecker+Valid, 1007 SdHoareTripleChecker+Invalid, 2934 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 2903 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2022-11-19 08:04:38,054 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1754 Valid, 1007 Invalid, 2934 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 2903 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2022-11-19 08:04:38,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2022-11-19 08:04:38,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 212. [2022-11-19 08:04:38,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 212 states, 210 states have (on average 1.019047619047619) internal successors, (214), 211 states have internal predecessors, (214), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:04:38,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 212 states to 212 states and 214 transitions. [2022-11-19 08:04:38,059 INFO L78 Accepts]: Start accepts. Automaton has 212 states and 214 transitions. Word has length 202 [2022-11-19 08:04:38,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 08:04:38,059 INFO L495 AbstractCegarLoop]: Abstraction has 212 states and 214 transitions. [2022-11-19 08:04:38,060 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 155 states, 154 states have (on average 3.9155844155844157) internal successors, (603), 155 states have internal predecessors, (603), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-19 08:04:38,060 INFO L276 IsEmpty]: Start isEmpty. Operand 212 states and 214 transitions. [2022-11-19 08:04:38,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2022-11-19 08:04:38,061 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 08:04:38,062 INFO L195 NwaCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 08:04:38,073 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2022-11-19 08:04:38,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:38,273 INFO L420 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-11-19 08:04:38,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 08:04:38,274 INFO L85 PathProgramCache]: Analyzing trace with hash -736430931, now seen corresponding path program 45 times [2022-11-19 08:04:38,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 08:04:38,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1696544654] [2022-11-19 08:04:38,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 08:04:38,274 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 08:04:38,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 08:04:41,935 INFO L134 CoverageAnalysis]: Checked inductivity of 2452 backedges. 123 proven. 2328 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:04:41,935 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 08:04:41,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1696544654] [2022-11-19 08:04:41,935 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1696544654] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 08:04:41,935 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1823141418] [2022-11-19 08:04:41,935 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 08:04:41,935 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 08:04:41,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 08:04:41,936 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 08:04:41,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d88de3c3-96aa-4df5-8daf-40951df596c7/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2022-11-19 08:04:44,085 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 08:04:44,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 08:04:44,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 1203 conjuncts, 167 conjunts are in the unsatisfiable core [2022-11-19 08:04:44,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 08:04:45,485 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:45,917 INFO L134 CoverageAnalysis]: Checked inductivity of 2452 backedges. 123 proven. 2328 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:04:45,917 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 08:04:46,263 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2022-11-19 08:04:46,266 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 16 treesize of output 12 [2022-11-19 08:04:46,609 INFO L134 CoverageAnalysis]: Checked inductivity of 2452 backedges. 123 proven. 2328 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-19 08:04:46,609 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1823141418] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 08:04:46,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1812026] [2022-11-19 08:04:46,611 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2022-11-19 08:04:46,611 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 08:04:46,611 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-19 08:04:46,611 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-19 08:04:46,611 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-19 08:04:46,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-19 08:04:46,638 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 15 [2022-11-19 08:04:46,667 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:46,694 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:46,716 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:46,761 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:46,800 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:46,830 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:46,851 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:46,890 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-11-19 08:04:46,929 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-11-19 08:04:46,929 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2022-11-19 08:04:47,279 INFO L180 IcfgInterpreter]: Interpretation finished