./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrspn-alloca-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 2329fc70 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrspn-alloca-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh --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 45a8f33f173b19ce98ca13bb7c3a70605cebce85501309e729b51c966620adf7 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 16:16:54,631 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 16:16:54,632 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 16:16:54,645 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 16:16:54,645 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 16:16:54,645 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 16:16:54,646 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 16:16:54,647 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 16:16:54,648 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 16:16:54,649 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 16:16:54,649 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 16:16:54,650 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 16:16:54,650 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 16:16:54,651 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 16:16:54,652 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 16:16:54,652 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 16:16:54,653 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 16:16:54,654 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 16:16:54,655 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 16:16:54,656 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 16:16:54,657 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 16:16:54,658 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 16:16:54,660 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 16:16:54,660 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 16:16:54,662 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 16:16:54,663 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 16:16:54,663 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 16:16:54,664 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 16:16:54,664 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 16:16:54,664 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 16:16:54,665 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 16:16:54,665 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 16:16:54,666 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 16:16:54,666 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 16:16:54,667 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 16:16:54,667 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 16:16:54,667 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 16:16:54,667 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 16:16:54,668 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 16:16:54,668 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 16:16:54,669 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 16:16:54,669 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-12-14 16:16:54,684 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 16:16:54,684 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 16:16:54,684 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 16:16:54,684 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 16:16:54,685 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 16:16:54,685 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 16:16:54,685 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 16:16:54,685 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 16:16:54,685 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 16:16:54,686 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 16:16:54,686 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 16:16:54,686 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 16:16:54,687 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 16:16:54,687 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 16:16:54,687 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 16:16:54,687 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 16:16:54,687 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 16:16:54,688 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 16:16:54,688 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-12-14 16:16:54,688 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-12-14 16:16:54,688 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 16:16:54,688 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 16:16:54,689 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-12-14 16:16:54,689 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 16:16:54,689 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 16:16:54,689 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 16:16:54,689 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-12-14 16:16:54,689 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-12-14 16:16:54,690 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-12-14 16:16:54,690 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 16:16:54,690 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-12-14 16:16:54,690 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 16:16:54,690 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 16:16:54,690 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 16:16:54,691 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 16:16:54,691 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 16:16:54,691 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 16:16:54,691 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 16:16:54,691 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 16:16:54,691 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 16:16:54,692 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 16:16:54,692 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 16:16:54,692 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_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 45a8f33f173b19ce98ca13bb7c3a70605cebce85501309e729b51c966620adf7 [2022-12-14 16:16:54,866 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 16:16:54,887 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 16:16:54,889 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 16:16:54,890 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 16:16:54,891 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 16:16:54,892 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/array-memsafety/cstrspn-alloca-1.i [2022-12-14 16:16:57,493 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 16:16:57,638 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 16:16:57,639 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/sv-benchmarks/c/array-memsafety/cstrspn-alloca-1.i [2022-12-14 16:16:57,646 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/data/13f1214a3/6dd4a2721c0549eca9bd42548ee17032/FLAGaf529cc14 [2022-12-14 16:16:57,657 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/data/13f1214a3/6dd4a2721c0549eca9bd42548ee17032 [2022-12-14 16:16:57,659 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 16:16:57,660 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 16:16:57,661 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 16:16:57,661 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 16:16:57,663 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 16:16:57,664 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 04:16:57" (1/1) ... [2022-12-14 16:16:57,665 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4534c18c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:16:57, skipping insertion in model container [2022-12-14 16:16:57,665 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 04:16:57" (1/1) ... [2022-12-14 16:16:57,670 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 16:16:57,693 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 16:16:57,869 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 16:16:57,877 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 16:16:57,906 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 16:16:57,923 INFO L208 MainTranslator]: Completed translation [2022-12-14 16:16:57,924 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:16:57 WrapperNode [2022-12-14 16:16:57,924 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 16:16:57,925 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 16:16:57,925 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 16:16:57,925 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 16:16:57,930 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:16:57" (1/1) ... [2022-12-14 16:16:57,939 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:16:57" (1/1) ... [2022-12-14 16:16:57,955 INFO L138 Inliner]: procedures = 117, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 102 [2022-12-14 16:16:57,955 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 16:16:57,956 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 16:16:57,956 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 16:16:57,956 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 16:16:57,963 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:16:57" (1/1) ... [2022-12-14 16:16:57,964 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:16:57" (1/1) ... [2022-12-14 16:16:57,966 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:16:57" (1/1) ... [2022-12-14 16:16:57,966 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:16:57" (1/1) ... [2022-12-14 16:16:57,970 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:16:57" (1/1) ... [2022-12-14 16:16:57,973 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:16:57" (1/1) ... [2022-12-14 16:16:57,974 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:16:57" (1/1) ... [2022-12-14 16:16:57,974 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:16:57" (1/1) ... [2022-12-14 16:16:57,976 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 16:16:57,976 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 16:16:57,977 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 16:16:57,977 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 16:16:57,977 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:16:57" (1/1) ... [2022-12-14 16:16:57,982 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 16:16:57,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:16:58,002 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 16:16:58,004 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 16:16:58,039 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2022-12-14 16:16:58,039 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-12-14 16:16:58,040 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-12-14 16:16:58,040 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-12-14 16:16:58,040 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 16:16:58,040 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 16:16:58,124 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 16:16:58,126 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 16:16:58,354 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 16:16:58,394 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 16:16:58,394 INFO L300 CfgBuilder]: Removed 4 assume(true) statements. [2022-12-14 16:16:58,396 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 04:16:58 BoogieIcfgContainer [2022-12-14 16:16:58,396 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 16:16:58,397 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 16:16:58,398 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 16:16:58,400 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 16:16:58,400 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 04:16:57" (1/3) ... [2022-12-14 16:16:58,400 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@be6b301 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 04:16:58, skipping insertion in model container [2022-12-14 16:16:58,400 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 04:16:57" (2/3) ... [2022-12-14 16:16:58,401 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@be6b301 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 04:16:58, skipping insertion in model container [2022-12-14 16:16:58,401 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 04:16:58" (3/3) ... [2022-12-14 16:16:58,402 INFO L112 eAbstractionObserver]: Analyzing ICFG cstrspn-alloca-1.i [2022-12-14 16:16:58,415 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 16:16:58,415 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 19 error locations. [2022-12-14 16:16:58,447 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 16:16:58,452 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;@315dad8c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 16:16:58,452 INFO L358 AbstractCegarLoop]: Starting to check reachability of 19 error locations. [2022-12-14 16:16:58,455 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 38 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:16:58,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-12-14 16:16:58,459 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:16:58,460 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-12-14 16:16:58,460 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)] === [2022-12-14 16:16:58,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:16:58,464 INFO L85 PathProgramCache]: Analyzing trace with hash 162186, now seen corresponding path program 1 times [2022-12-14 16:16:58,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:16:58,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650352002] [2022-12-14 16:16:58,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:16:58,472 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:16:58,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:16:58,733 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:16:58,733 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:16:58,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650352002] [2022-12-14 16:16:58,734 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650352002] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:16:58,734 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:16:58,735 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-12-14 16:16:58,736 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623241794] [2022-12-14 16:16:58,737 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:16:58,741 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 16:16:58,741 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:16:58,769 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 16:16:58,769 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 16:16:58,771 INFO L87 Difference]: Start difference. First operand has 39 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 38 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) 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) [2022-12-14 16:16:58,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:16:58,830 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2022-12-14 16:16:58,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 16:16:58,832 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 [2022-12-14 16:16:58,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:16:58,837 INFO L225 Difference]: With dead ends: 37 [2022-12-14 16:16:58,837 INFO L226 Difference]: Without dead ends: 36 [2022-12-14 16:16:58,839 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 [2022-12-14 16:16:58,841 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 37 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 16:16:58,842 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 18 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 16:16:58,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-12-14 16:16:58,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2022-12-14 16:16:58,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 35 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:16:58,862 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2022-12-14 16:16:58,863 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 3 [2022-12-14 16:16:58,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:16:58,863 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2022-12-14 16:16:58,863 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) [2022-12-14 16:16:58,863 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2022-12-14 16:16:58,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2022-12-14 16:16:58,864 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:16:58,864 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2022-12-14 16:16:58,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 16:16:58,864 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)] === [2022-12-14 16:16:58,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:16:58,865 INFO L85 PathProgramCache]: Analyzing trace with hash 162187, now seen corresponding path program 1 times [2022-12-14 16:16:58,865 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:16:58,865 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1831698041] [2022-12-14 16:16:58,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:16:58,865 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:16:58,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:16:59,047 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:16:59,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:16:59,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1831698041] [2022-12-14 16:16:59,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1831698041] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:16:59,048 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:16:59,048 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 16:16:59,048 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445735900] [2022-12-14 16:16:59,048 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:16:59,049 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 16:16:59,049 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:16:59,050 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 16:16:59,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 16:16:59,050 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:16:59,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:16:59,156 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2022-12-14 16:16:59,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 16:16:59,156 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 [2022-12-14 16:16:59,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:16:59,157 INFO L225 Difference]: With dead ends: 70 [2022-12-14 16:16:59,158 INFO L226 Difference]: Without dead ends: 70 [2022-12-14 16:16:59,158 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 [2022-12-14 16:16:59,160 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 38 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 16:16:59,160 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 55 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 16:16:59,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-12-14 16:16:59,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 38. [2022-12-14 16:16:59,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 37 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:16:59,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2022-12-14 16:16:59,164 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 3 [2022-12-14 16:16:59,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:16:59,164 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2022-12-14 16:16:59,165 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) [2022-12-14 16:16:59,165 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2022-12-14 16:16:59,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-12-14 16:16:59,165 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:16:59,165 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-12-14 16:16:59,166 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 16:16:59,166 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:16:59,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:16:59,167 INFO L85 PathProgramCache]: Analyzing trace with hash 5136908, now seen corresponding path program 1 times [2022-12-14 16:16:59,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:16:59,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [965193196] [2022-12-14 16:16:59,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:16:59,167 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:16:59,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:16:59,307 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:16:59,307 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:16:59,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [965193196] [2022-12-14 16:16:59,307 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [965193196] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:16:59,308 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:16:59,308 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-12-14 16:16:59,308 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683908366] [2022-12-14 16:16:59,308 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:16:59,308 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 16:16:59,309 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:16:59,309 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 16:16:59,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 16:16:59,309 INFO L87 Difference]: Start difference. First operand 38 states and 44 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) [2022-12-14 16:16:59,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:16:59,351 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2022-12-14 16:16:59,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 16:16:59,352 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 [2022-12-14 16:16:59,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:16:59,353 INFO L225 Difference]: With dead ends: 37 [2022-12-14 16:16:59,353 INFO L226 Difference]: Without dead ends: 37 [2022-12-14 16:16:59,353 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 [2022-12-14 16:16:59,354 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 37 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 18 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 [2022-12-14 16:16:59,355 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 18 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 16:16:59,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2022-12-14 16:16:59,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2022-12-14 16:16:59,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 36 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:16:59,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2022-12-14 16:16:59,357 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 4 [2022-12-14 16:16:59,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:16:59,358 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2022-12-14 16:16:59,358 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) [2022-12-14 16:16:59,358 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2022-12-14 16:16:59,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-12-14 16:16:59,358 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:16:59,359 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-12-14 16:16:59,359 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-12-14 16:16:59,359 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:16:59,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:16:59,359 INFO L85 PathProgramCache]: Analyzing trace with hash 5134015, now seen corresponding path program 1 times [2022-12-14 16:16:59,360 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:16:59,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1978139269] [2022-12-14 16:16:59,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:16:59,360 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:16:59,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:16:59,388 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:16:59,388 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:16:59,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1978139269] [2022-12-14 16:16:59,388 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1978139269] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:16:59,388 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:16:59,388 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-12-14 16:16:59,389 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658343614] [2022-12-14 16:16:59,389 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:16:59,389 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 16:16:59,389 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:16:59,390 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 16:16:59,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 16:16:59,390 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:16:59,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:16:59,419 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2022-12-14 16:16:59,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 16:16:59,420 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 [2022-12-14 16:16:59,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:16:59,420 INFO L225 Difference]: With dead ends: 35 [2022-12-14 16:16:59,420 INFO L226 Difference]: Without dead ends: 35 [2022-12-14 16:16:59,421 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 [2022-12-14 16:16:59,422 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 33 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 16:16:59,422 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 17 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 16:16:59,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2022-12-14 16:16:59,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2022-12-14 16:16:59,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 34 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:16:59,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2022-12-14 16:16:59,426 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 4 [2022-12-14 16:16:59,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:16:59,426 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2022-12-14 16:16:59,426 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) [2022-12-14 16:16:59,426 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2022-12-14 16:16:59,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-12-14 16:16:59,427 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:16:59,427 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-12-14 16:16:59,427 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-12-14 16:16:59,427 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:16:59,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:16:59,428 INFO L85 PathProgramCache]: Analyzing trace with hash 5134016, now seen corresponding path program 1 times [2022-12-14 16:16:59,428 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:16:59,428 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952059680] [2022-12-14 16:16:59,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:16:59,428 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:16:59,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:16:59,576 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:16:59,576 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:16:59,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952059680] [2022-12-14 16:16:59,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1952059680] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:16:59,577 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:16:59,577 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 16:16:59,577 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513753297] [2022-12-14 16:16:59,577 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:16:59,577 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 16:16:59,577 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:16:59,578 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 16:16:59,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-12-14 16:16:59,578 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:16:59,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:16:59,684 INFO L93 Difference]: Finished difference Result 63 states and 73 transitions. [2022-12-14 16:16:59,684 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 16:16:59,684 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 [2022-12-14 16:16:59,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:16:59,685 INFO L225 Difference]: With dead ends: 63 [2022-12-14 16:16:59,685 INFO L226 Difference]: Without dead ends: 63 [2022-12-14 16:16:59,685 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 [2022-12-14 16:16:59,686 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 68 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 16:16:59,686 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 48 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 16:16:59,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-12-14 16:16:59,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 37. [2022-12-14 16:16:59,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 36 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:16:59,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2022-12-14 16:16:59,688 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 4 [2022-12-14 16:16:59,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:16:59,689 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2022-12-14 16:16:59,689 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) [2022-12-14 16:16:59,689 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2022-12-14 16:16:59,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-12-14 16:16:59,689 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:16:59,689 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-12-14 16:16:59,689 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-12-14 16:16:59,689 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:16:59,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:16:59,690 INFO L85 PathProgramCache]: Analyzing trace with hash 159244142, now seen corresponding path program 1 times [2022-12-14 16:16:59,690 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:16:59,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1221847046] [2022-12-14 16:16:59,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:16:59,690 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:16:59,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:16:59,893 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:16:59,894 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:16:59,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1221847046] [2022-12-14 16:16:59,894 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1221847046] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:16:59,894 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:16:59,894 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 16:16:59,894 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978189146] [2022-12-14 16:16:59,894 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:16:59,894 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 16:16:59,894 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:16:59,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 16:16:59,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2022-12-14 16:16:59,895 INFO L87 Difference]: Start difference. First operand 37 states and 44 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) [2022-12-14 16:16:59,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:16:59,981 INFO L93 Difference]: Finished difference Result 62 states and 72 transitions. [2022-12-14 16:16:59,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 16:16:59,982 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 [2022-12-14 16:16:59,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:16:59,983 INFO L225 Difference]: With dead ends: 62 [2022-12-14 16:16:59,983 INFO L226 Difference]: Without dead ends: 62 [2022-12-14 16:16:59,983 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 [2022-12-14 16:16:59,984 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 65 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 16:16:59,984 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 48 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 16:16:59,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2022-12-14 16:16:59,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 39. [2022-12-14 16:16:59,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 25 states have (on average 1.84) internal successors, (46), 38 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:16:59,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 46 transitions. [2022-12-14 16:16:59,988 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 46 transitions. Word has length 5 [2022-12-14 16:16:59,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:16:59,989 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 46 transitions. [2022-12-14 16:16:59,989 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) [2022-12-14 16:16:59,989 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 46 transitions. [2022-12-14 16:16:59,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-12-14 16:16:59,989 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:16:59,989 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1] [2022-12-14 16:16:59,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-12-14 16:16:59,990 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:16:59,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:16:59,990 INFO L85 PathProgramCache]: Analyzing trace with hash 155961429, now seen corresponding path program 1 times [2022-12-14 16:16:59,991 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:16:59,991 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [88480937] [2022-12-14 16:16:59,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:16:59,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:00,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:00,186 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:17:00,186 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:00,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [88480937] [2022-12-14 16:17:00,186 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [88480937] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:17:00,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1993685423] [2022-12-14 16:17:00,186 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:00,186 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:00,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:17:00,188 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:17:00,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 16:17:00,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:00,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 16:17:00,245 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:17:00,321 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:17:00,329 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 [2022-12-14 16:17:00,339 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 [2022-12-14 16:17:00,481 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:17:00,481 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:17:00,574 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:17:00,574 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1993685423] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:17:00,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1065855208] [2022-12-14 16:17:00,588 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2022-12-14 16:17:00,588 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:17:00,591 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:17:00,600 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:17:00,600 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:17:00,647 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:17:00,650 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 [2022-12-14 16:17:00,697 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 11 treesize of output 7 [2022-12-14 16:17:00,781 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:00,813 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 14 treesize of output 10 [2022-12-14 16:17:00,853 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:17:01,109 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '630#(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 [2022-12-14 16:17:01,110 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:17:01,110 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:17:01,110 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 9 [2022-12-14 16:17:01,110 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [356565594] [2022-12-14 16:17:01,110 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:17:01,111 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-12-14 16:17:01,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:01,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-12-14 16:17:01,111 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182 [2022-12-14 16:17:01,112 INFO L87 Difference]: Start difference. First operand 39 states and 46 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) [2022-12-14 16:17:01,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:01,449 INFO L93 Difference]: Finished difference Result 105 states and 123 transitions. [2022-12-14 16:17:01,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-12-14 16:17:01,450 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 [2022-12-14 16:17:01,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:01,451 INFO L225 Difference]: With dead ends: 105 [2022-12-14 16:17:01,451 INFO L226 Difference]: Without dead ends: 105 [2022-12-14 16:17:01,451 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=71, Invalid=201, Unknown=0, NotChecked=0, Total=272 [2022-12-14 16:17:01,452 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 171 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 275 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 275 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:01,452 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [171 Valid, 224 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 275 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 16:17:01,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-12-14 16:17:01,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 36. [2022-12-14 16:17:01,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 23 states have (on average 1.826086956521739) internal successors, (42), 35 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:01,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2022-12-14 16:17:01,455 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 5 [2022-12-14 16:17:01,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:01,455 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2022-12-14 16:17:01,455 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) [2022-12-14 16:17:01,455 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2022-12-14 16:17:01,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 16:17:01,455 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:01,455 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 16:17:01,461 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 16:17:01,656 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:01,656 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:17:01,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:01,657 INFO L85 PathProgramCache]: Analyzing trace with hash 641603338, now seen corresponding path program 1 times [2022-12-14 16:17:01,657 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:01,657 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [822721995] [2022-12-14 16:17:01,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:01,657 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:01,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:01,689 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:17:01,689 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:01,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [822721995] [2022-12-14 16:17:01,689 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [822721995] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:17:01,689 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:17:01,689 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 16:17:01,689 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135738149] [2022-12-14 16:17:01,689 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:17:01,690 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 16:17:01,690 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:01,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 16:17:01,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 16:17:01,690 INFO L87 Difference]: Start difference. First operand 36 states and 42 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) [2022-12-14 16:17:01,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:01,722 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2022-12-14 16:17:01,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 16:17:01,723 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 [2022-12-14 16:17:01,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:01,723 INFO L225 Difference]: With dead ends: 34 [2022-12-14 16:17:01,723 INFO L226 Difference]: Without dead ends: 34 [2022-12-14 16:17:01,724 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 [2022-12-14 16:17:01,724 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 52 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:01,724 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 20 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 16:17:01,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-12-14 16:17:01,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2022-12-14 16:17:01,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.7391304347826086) internal successors, (40), 33 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:01,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 40 transitions. [2022-12-14 16:17:01,726 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 40 transitions. Word has length 6 [2022-12-14 16:17:01,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:01,726 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 40 transitions. [2022-12-14 16:17:01,726 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) [2022-12-14 16:17:01,727 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 40 transitions. [2022-12-14 16:17:01,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 16:17:01,727 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:01,727 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-12-14 16:17:01,727 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-12-14 16:17:01,727 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)] === [2022-12-14 16:17:01,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:01,728 INFO L85 PathProgramCache]: Analyzing trace with hash 641603339, now seen corresponding path program 1 times [2022-12-14 16:17:01,728 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:01,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110075241] [2022-12-14 16:17:01,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:01,728 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:01,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:01,784 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:17:01,784 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:01,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110075241] [2022-12-14 16:17:01,785 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1110075241] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:17:01,785 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:17:01,785 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 16:17:01,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [236728389] [2022-12-14 16:17:01,785 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:17:01,785 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 16:17:01,785 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:01,786 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 16:17:01,786 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-12-14 16:17:01,786 INFO L87 Difference]: Start difference. First operand 34 states and 40 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) [2022-12-14 16:17:01,839 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:01,840 INFO L93 Difference]: Finished difference Result 53 states and 62 transitions. [2022-12-14 16:17:01,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 16:17:01,840 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 [2022-12-14 16:17:01,840 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:01,841 INFO L225 Difference]: With dead ends: 53 [2022-12-14 16:17:01,841 INFO L226 Difference]: Without dead ends: 53 [2022-12-14 16:17:01,841 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 [2022-12-14 16:17:01,842 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 129 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:01,842 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [129 Valid, 26 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 16:17:01,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-12-14 16:17:01,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 37. [2022-12-14 16:17:01,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 26 states have (on average 1.6923076923076923) internal successors, (44), 36 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:01,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2022-12-14 16:17:01,845 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 6 [2022-12-14 16:17:01,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:01,845 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2022-12-14 16:17:01,845 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) [2022-12-14 16:17:01,845 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2022-12-14 16:17:01,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-12-14 16:17:01,845 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:01,845 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2022-12-14 16:17:01,845 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-12-14 16:17:01,845 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:17:01,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:01,846 INFO L85 PathProgramCache]: Analyzing trace with hash 638899314, now seen corresponding path program 1 times [2022-12-14 16:17:01,846 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:01,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1244870195] [2022-12-14 16:17:01,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:01,846 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:01,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:02,000 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:17:02,000 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:02,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1244870195] [2022-12-14 16:17:02,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1244870195] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:17:02,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1138810489] [2022-12-14 16:17:02,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:02,001 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:02,001 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:17:02,002 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:17:02,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 16:17:02,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:02,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 16:17:02,044 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:17:02,071 INFO L321 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2022-12-14 16:17:02,071 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 [2022-12-14 16:17:02,193 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:17:02,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:17:02,315 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:17:02,316 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1138810489] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:17:02,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1921462630] [2022-12-14 16:17:02,317 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2022-12-14 16:17:02,317 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:17:02,318 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:17:02,318 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:17:02,318 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:17:02,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:17:02,343 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 [2022-12-14 16:17:02,378 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 11 treesize of output 7 [2022-12-14 16:17:02,422 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 [2022-12-14 16:17:02,441 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:17:02,870 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '995#(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|) (= |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) (< (+ |ULTIMATE.start_main_~i~1#1| 1) |ULTIMATE.start_main_~length2~0#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 [2022-12-14 16:17:02,870 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:17:02,870 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:17:02,870 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 12 [2022-12-14 16:17:02,870 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012276071] [2022-12-14 16:17:02,871 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:17:02,871 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 16:17:02,871 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:02,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 16:17:02,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2022-12-14 16:17:02,872 INFO L87 Difference]: Start difference. First operand 37 states and 44 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) [2022-12-14 16:17:03,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:03,105 INFO L93 Difference]: Finished difference Result 86 states and 102 transitions. [2022-12-14 16:17:03,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 16:17:03,106 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 [2022-12-14 16:17:03,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:03,107 INFO L225 Difference]: With dead ends: 86 [2022-12-14 16:17:03,107 INFO L226 Difference]: Without dead ends: 86 [2022-12-14 16:17:03,107 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=101, Invalid=319, Unknown=0, NotChecked=0, Total=420 [2022-12-14 16:17:03,108 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 222 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 185 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 222 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 185 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:03,108 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [222 Valid, 149 Invalid, 188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 185 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 16:17:03,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2022-12-14 16:17:03,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 31. [2022-12-14 16:17:03,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 30 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) [2022-12-14 16:17:03,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2022-12-14 16:17:03,110 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 6 [2022-12-14 16:17:03,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:03,110 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2022-12-14 16:17:03,110 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) [2022-12-14 16:17:03,110 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2022-12-14 16:17:03,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 16:17:03,110 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:03,111 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:17:03,116 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 16:17:03,311 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:03,312 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:17:03,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:03,314 INFO L85 PathProgramCache]: Analyzing trace with hash 1400614513, now seen corresponding path program 1 times [2022-12-14 16:17:03,314 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:03,314 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [334738819] [2022-12-14 16:17:03,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:03,315 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:03,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:03,448 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:17:03,448 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:03,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [334738819] [2022-12-14 16:17:03,448 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [334738819] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:17:03,448 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:17:03,448 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 16:17:03,449 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780960692] [2022-12-14 16:17:03,449 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:17:03,449 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 16:17:03,449 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:03,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 16:17:03,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 16:17:03,450 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 4 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:03,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:03,494 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2022-12-14 16:17:03,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 16:17:03,495 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-12-14 16:17:03,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:03,495 INFO L225 Difference]: With dead ends: 30 [2022-12-14 16:17:03,495 INFO L226 Difference]: Without dead ends: 30 [2022-12-14 16:17:03,495 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 [2022-12-14 16:17:03,496 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 34 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:03,496 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 20 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 16:17:03,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-12-14 16:17:03,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2022-12-14 16:17:03,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 27 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) [2022-12-14 16:17:03,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2022-12-14 16:17:03,499 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 9 [2022-12-14 16:17:03,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:03,499 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2022-12-14 16:17:03,499 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.0) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:03,499 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2022-12-14 16:17:03,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-12-14 16:17:03,500 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:03,500 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:17:03,500 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-12-14 16:17:03,500 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:17:03,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:03,500 INFO L85 PathProgramCache]: Analyzing trace with hash 1400614514, now seen corresponding path program 1 times [2022-12-14 16:17:03,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:03,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246474512] [2022-12-14 16:17:03,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:03,500 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:03,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:03,598 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:17:03,599 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:03,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246474512] [2022-12-14 16:17:03,599 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1246474512] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:17:03,599 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:17:03,599 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 16:17:03,599 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772996241] [2022-12-14 16:17:03,599 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:17:03,599 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 16:17:03,599 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:03,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 16:17:03,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 16:17:03,600 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:03,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:03,679 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2022-12-14 16:17:03,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 16:17:03,680 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-12-14 16:17:03,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:03,680 INFO L225 Difference]: With dead ends: 41 [2022-12-14 16:17:03,680 INFO L226 Difference]: Without dead ends: 41 [2022-12-14 16:17:03,681 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2022-12-14 16:17:03,681 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 81 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:03,682 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 23 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 16:17:03,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2022-12-14 16:17:03,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 33. [2022-12-14 16:17:03,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 27 states have (on average 1.5185185185185186) internal successors, (41), 32 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:03,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2022-12-14 16:17:03,684 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 9 [2022-12-14 16:17:03,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:03,685 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2022-12-14 16:17:03,685 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:03,685 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2022-12-14 16:17:03,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 16:17:03,685 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:03,685 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:17:03,685 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-12-14 16:17:03,686 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)] === [2022-12-14 16:17:03,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:03,686 INFO L85 PathProgramCache]: Analyzing trace with hash 469310905, now seen corresponding path program 1 times [2022-12-14 16:17:03,686 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:03,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1832586208] [2022-12-14 16:17:03,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:03,687 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:03,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:03,834 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:17:03,834 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:03,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1832586208] [2022-12-14 16:17:03,834 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1832586208] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:17:03,834 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:17:03,834 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 16:17:03,835 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024470848] [2022-12-14 16:17:03,835 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:17:03,835 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 16:17:03,835 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:03,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 16:17:03,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-12-14 16:17:03,836 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:03,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:03,855 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2022-12-14 16:17:03,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 16:17:03,856 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-12-14 16:17:03,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:03,856 INFO L225 Difference]: With dead ends: 32 [2022-12-14 16:17:03,856 INFO L226 Difference]: Without dead ends: 29 [2022-12-14 16:17:03,856 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-12-14 16:17:03,856 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 22 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:03,857 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 30 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 16:17:03,857 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2022-12-14 16:17:03,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2022-12-14 16:17:03,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 28 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) [2022-12-14 16:17:03,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2022-12-14 16:17:03,858 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 10 [2022-12-14 16:17:03,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:03,858 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2022-12-14 16:17:03,858 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.5) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:03,858 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2022-12-14 16:17:03,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-12-14 16:17:03,858 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:03,858 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:17:03,858 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-12-14 16:17:03,859 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:17:03,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:03,859 INFO L85 PathProgramCache]: Analyzing trace with hash 101075500, now seen corresponding path program 1 times [2022-12-14 16:17:03,859 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:03,859 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709553799] [2022-12-14 16:17:03,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:03,859 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:03,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:03,875 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:17:03,875 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:03,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [709553799] [2022-12-14 16:17:03,875 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [709553799] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:17:03,875 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:17:03,875 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 16:17:03,876 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [430109469] [2022-12-14 16:17:03,876 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:17:03,876 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 16:17:03,876 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:03,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 16:17:03,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 16:17:03,877 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 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) [2022-12-14 16:17:03,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:03,893 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2022-12-14 16:17:03,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 16:17:03,894 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 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 [2022-12-14 16:17:03,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:03,894 INFO L225 Difference]: With dead ends: 31 [2022-12-14 16:17:03,894 INFO L226 Difference]: Without dead ends: 31 [2022-12-14 16:17:03,895 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 [2022-12-14 16:17:03,895 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 25 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 [2022-12-14 16:17:03,895 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 25 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 16:17:03,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2022-12-14 16:17:03,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2022-12-14 16:17:03,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 30 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) [2022-12-14 16:17:03,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2022-12-14 16:17:03,898 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 12 [2022-12-14 16:17:03,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:03,898 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2022-12-14 16:17:03,898 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 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) [2022-12-14 16:17:03,898 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2022-12-14 16:17:03,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-12-14 16:17:03,898 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:03,898 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:17:03,898 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-12-14 16:17:03,898 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:17:03,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:03,899 INFO L85 PathProgramCache]: Analyzing trace with hash -1161774215, now seen corresponding path program 1 times [2022-12-14 16:17:03,899 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:03,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1977774031] [2022-12-14 16:17:03,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:03,899 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:03,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:04,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:04,079 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:04,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1977774031] [2022-12-14 16:17:04,080 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1977774031] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:17:04,080 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:17:04,080 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-12-14 16:17:04,080 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639260893] [2022-12-14 16:17:04,080 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:17:04,080 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-12-14 16:17:04,080 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:04,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-12-14 16:17:04,081 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-12-14 16:17:04,081 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:04,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:04,173 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2022-12-14 16:17:04,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 16:17:04,173 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-12-14 16:17:04,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:04,174 INFO L225 Difference]: With dead ends: 39 [2022-12-14 16:17:04,174 INFO L226 Difference]: Without dead ends: 33 [2022-12-14 16:17:04,174 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 [2022-12-14 16:17:04,175 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 8 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:04,175 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 69 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 16:17:04,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2022-12-14 16:17:04,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2022-12-14 16:17:04,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 31 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) [2022-12-14 16:17:04,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2022-12-14 16:17:04,177 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 13 [2022-12-14 16:17:04,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:04,177 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2022-12-14 16:17:04,177 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:04,177 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2022-12-14 16:17:04,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-12-14 16:17:04,178 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:04,178 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:17:04,178 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-12-14 16:17:04,178 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:17:04,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:04,179 INFO L85 PathProgramCache]: Analyzing trace with hash -1481271869, now seen corresponding path program 1 times [2022-12-14 16:17:04,179 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:04,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1144401152] [2022-12-14 16:17:04,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:04,179 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:04,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:04,352 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:04,352 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:04,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1144401152] [2022-12-14 16:17:04,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1144401152] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:17:04,353 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:17:04,353 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-12-14 16:17:04,353 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1461616495] [2022-12-14 16:17:04,353 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:17:04,353 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 16:17:04,353 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:04,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 16:17:04,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-12-14 16:17:04,354 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 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) [2022-12-14 16:17:04,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:04,467 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2022-12-14 16:17:04,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 16:17:04,467 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-12-14 16:17:04,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:04,467 INFO L225 Difference]: With dead ends: 49 [2022-12-14 16:17:04,468 INFO L226 Difference]: Without dead ends: 49 [2022-12-14 16:17:04,468 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2022-12-14 16:17:04,468 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 65 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 97 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:04,468 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 56 Invalid, 97 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 16:17:04,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-12-14 16:17:04,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2022-12-14 16:17:04,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.3414634146341464) internal successors, (55), 45 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:04,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 55 transitions. [2022-12-14 16:17:04,470 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 55 transitions. Word has length 15 [2022-12-14 16:17:04,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:04,470 INFO L495 AbstractCegarLoop]: Abstraction has 46 states and 55 transitions. [2022-12-14 16:17:04,470 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 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) [2022-12-14 16:17:04,470 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 55 transitions. [2022-12-14 16:17:04,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-12-14 16:17:04,470 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:04,470 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:17:04,470 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-12-14 16:17:04,471 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)] === [2022-12-14 16:17:04,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:04,471 INFO L85 PathProgramCache]: Analyzing trace with hash 1329745851, now seen corresponding path program 1 times [2022-12-14 16:17:04,471 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:04,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150192569] [2022-12-14 16:17:04,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:04,471 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:04,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:04,540 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:04,540 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:04,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150192569] [2022-12-14 16:17:04,541 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150192569] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 16:17:04,541 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 16:17:04,541 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-12-14 16:17:04,541 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454524439] [2022-12-14 16:17:04,541 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 16:17:04,541 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-12-14 16:17:04,541 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:04,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-12-14 16:17:04,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2022-12-14 16:17:04,542 INFO L87 Difference]: Start difference. First operand 46 states and 55 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:04,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:04,635 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2022-12-14 16:17:04,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 16:17:04,636 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-12-14 16:17:04,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:04,636 INFO L225 Difference]: With dead ends: 47 [2022-12-14 16:17:04,636 INFO L226 Difference]: Without dead ends: 34 [2022-12-14 16:17:04,637 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2022-12-14 16:17:04,637 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 37 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:04,637 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 36 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 16:17:04,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-12-14 16:17:04,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2022-12-14 16:17:04,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.3571428571428572) internal successors, (38), 32 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) [2022-12-14 16:17:04,639 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2022-12-14 16:17:04,639 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 16 [2022-12-14 16:17:04,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:04,640 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2022-12-14 16:17:04,640 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:04,640 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2022-12-14 16:17:04,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-12-14 16:17:04,640 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:04,640 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:17:04,640 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-12-14 16:17:04,640 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:17:04,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:04,641 INFO L85 PathProgramCache]: Analyzing trace with hash -298912303, now seen corresponding path program 1 times [2022-12-14 16:17:04,641 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:04,641 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [139197645] [2022-12-14 16:17:04,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:04,641 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:04,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:04,838 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:04,838 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:04,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [139197645] [2022-12-14 16:17:04,838 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [139197645] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:17:04,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [824204563] [2022-12-14 16:17:04,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:04,838 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:04,839 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:17:04,839 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:17:04,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 16:17:04,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:04,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 16:17:04,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:17:04,980 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:04,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:17:05,047 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 [2022-12-14 16:17:05,064 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:05,064 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [824204563] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:17:05,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1076678222] [2022-12-14 16:17:05,067 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:17:05,067 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:17:05,067 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:17:05,067 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:17:05,067 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:17:05,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:17:05,095 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 [2022-12-14 16:17:05,130 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 [2022-12-14 16:17:05,165 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:05,186 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:05,234 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 [2022-12-14 16:17:05,280 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:05,311 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:05,330 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:05,362 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:05,404 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:17:05,404 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 [2022-12-14 16:17:05,576 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:17:07,301 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1807#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:17:07,301 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:17:07,302 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:17:07,302 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 17 [2022-12-14 16:17:07,302 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1321029931] [2022-12-14 16:17:07,302 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:17:07,302 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 16:17:07,302 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:07,303 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 16:17:07,303 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=851, Unknown=0, NotChecked=0, Total=992 [2022-12-14 16:17:07,304 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:07,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:07,451 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2022-12-14 16:17:07,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 16:17:07,452 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2022-12-14 16:17:07,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:07,452 INFO L225 Difference]: With dead ends: 47 [2022-12-14 16:17:07,452 INFO L226 Difference]: Without dead ends: 43 [2022-12-14 16:17:07,452 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=202, Invalid=1130, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 16:17:07,453 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 249 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 249 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:07,453 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [249 Valid, 28 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 16:17:07,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-12-14 16:17:07,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 29. [2022-12-14 16:17:07,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 26 states have (on average 1.2692307692307692) 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) [2022-12-14 16:17:07,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2022-12-14 16:17:07,454 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 17 [2022-12-14 16:17:07,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:07,454 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2022-12-14 16:17:07,454 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:07,454 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2022-12-14 16:17:07,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 16:17:07,455 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:07,455 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:17:07,459 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 16:17:07,655 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 16:17:07,656 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)] === [2022-12-14 16:17:07,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:07,658 INFO L85 PathProgramCache]: Analyzing trace with hash 508049194, now seen corresponding path program 1 times [2022-12-14 16:17:07,658 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:07,658 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1484506320] [2022-12-14 16:17:07,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:07,659 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:07,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:07,808 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:07,808 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:07,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1484506320] [2022-12-14 16:17:07,808 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1484506320] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:17:07,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1434295352] [2022-12-14 16:17:07,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:07,808 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:07,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:17:07,809 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:17:07,810 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 16:17:07,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:07,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 16:17:07,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:17:07,958 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:07,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:17:08,051 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 [2022-12-14 16:17:08,070 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:08,070 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1434295352] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:17:08,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [543628550] [2022-12-14 16:17:08,073 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 16:17:08,073 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:17:08,073 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:17:08,073 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:17:08,073 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:17:08,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:17:08,096 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 [2022-12-14 16:17:08,126 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:17:08,162 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:08,194 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:08,228 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 [2022-12-14 16:17:08,275 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:17:08,276 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 [2022-12-14 16:17:08,323 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:08,344 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:08,427 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:17:08,427 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 [2022-12-14 16:17:08,554 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:17:08,554 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 [2022-12-14 16:17:09,891 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:17:12,571 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2032#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:17:12,571 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:17:12,571 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:17:12,571 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 15 [2022-12-14 16:17:12,571 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517757205] [2022-12-14 16:17:12,571 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:17:12,571 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 16:17:12,571 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:12,572 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 16:17:12,572 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=850, Unknown=0, NotChecked=0, Total=992 [2022-12-14 16:17:12,572 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 17 states, 16 states have (on average 3.0625) internal successors, (49), 16 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:12,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:12,701 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2022-12-14 16:17:12,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-12-14 16:17:12,702 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 3.0625) internal successors, (49), 16 states have internal predecessors, (49), 0 states have call successors, (0), 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 19 [2022-12-14 16:17:12,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:12,702 INFO L225 Difference]: With dead ends: 56 [2022-12-14 16:17:12,702 INFO L226 Difference]: Without dead ends: 56 [2022-12-14 16:17:12,703 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 391 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=198, Invalid=1134, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 16:17:12,703 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 177 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 144 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 144 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:12,703 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [177 Valid, 45 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 144 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 16:17:12,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2022-12-14 16:17:12,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 40. [2022-12-14 16:17:12,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 38 states have (on average 1.236842105263158) internal successors, (47), 39 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) [2022-12-14 16:17:12,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 47 transitions. [2022-12-14 16:17:12,705 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 47 transitions. Word has length 19 [2022-12-14 16:17:12,705 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:12,705 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 47 transitions. [2022-12-14 16:17:12,706 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 3.0625) internal successors, (49), 16 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:12,706 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 47 transitions. [2022-12-14 16:17:12,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-12-14 16:17:12,706 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:12,706 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:17:12,711 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 16:17:12,907 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:12,908 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:17:12,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:12,910 INFO L85 PathProgramCache]: Analyzing trace with hash -1313653928, now seen corresponding path program 2 times [2022-12-14 16:17:12,910 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:12,910 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1277516136] [2022-12-14 16:17:12,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:12,911 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:12,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:13,173 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:13,174 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:13,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1277516136] [2022-12-14 16:17:13,174 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1277516136] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:17:13,174 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [106641259] [2022-12-14 16:17:13,174 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 16:17:13,174 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:13,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:17:13,175 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:17:13,176 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 16:17:13,238 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 16:17:13,238 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:17:13,240 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 35 conjunts are in the unsatisfiable core [2022-12-14 16:17:13,241 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:17:13,283 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:13,430 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:13,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:17:13,494 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 [2022-12-14 16:17:13,495 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 [2022-12-14 16:17:13,568 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:13,568 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [106641259] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:17:13,568 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [502697615] [2022-12-14 16:17:13,570 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:17:13,570 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:17:13,571 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:17:13,571 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:17:13,571 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:17:13,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:17:13,593 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 [2022-12-14 16:17:13,623 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 11 treesize of output 7 [2022-12-14 16:17:13,661 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 14 treesize of output 10 [2022-12-14 16:17:13,696 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:13,729 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 11 treesize of output 7 [2022-12-14 16:17:13,772 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:17:13,773 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 [2022-12-14 16:17:13,820 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:13,842 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 14 treesize of output 10 [2022-12-14 16:17:13,921 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:17:13,921 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 177 treesize of output 181 [2022-12-14 16:17:14,059 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:17:14,059 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 [2022-12-14 16:17:14,947 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:17:17,668 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2298#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:17:17,668 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:17:17,668 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:17:17,668 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 25 [2022-12-14 16:17:17,668 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81740455] [2022-12-14 16:17:17,669 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:17:17,669 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 16:17:17,669 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:17,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 16:17:17,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 16:17:17,670 INFO L87 Difference]: Start difference. First operand 40 states and 47 transitions. Second operand has 25 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:17,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:17,866 INFO L93 Difference]: Finished difference Result 69 states and 77 transitions. [2022-12-14 16:17:17,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 16:17:17,867 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-12-14 16:17:17,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:17,867 INFO L225 Difference]: With dead ends: 69 [2022-12-14 16:17:17,867 INFO L226 Difference]: Without dead ends: 65 [2022-12-14 16:17:17,868 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 694 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=265, Invalid=1805, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 16:17:17,868 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 117 mSDsluCounter, 70 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 199 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:17,868 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [117 Valid, 76 Invalid, 199 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 16:17:17,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-12-14 16:17:17,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2022-12-14 16:17:17,870 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 61 states have (on average 1.180327868852459) internal successors, (72), 62 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) [2022-12-14 16:17:17,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 72 transitions. [2022-12-14 16:17:17,870 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 72 transitions. Word has length 21 [2022-12-14 16:17:17,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:17,870 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 72 transitions. [2022-12-14 16:17:17,871 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:17,871 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 72 transitions. [2022-12-14 16:17:17,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-12-14 16:17:17,871 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:17,871 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:17:17,876 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 16:17:18,072 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:18,073 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:17:18,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:18,075 INFO L85 PathProgramCache]: Analyzing trace with hash -1271146266, now seen corresponding path program 3 times [2022-12-14 16:17:18,075 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:18,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [428542478] [2022-12-14 16:17:18,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:18,076 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:18,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:18,349 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:18,350 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:18,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [428542478] [2022-12-14 16:17:18,350 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [428542478] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:17:18,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603581414] [2022-12-14 16:17:18,350 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 16:17:18,350 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:18,350 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:17:18,351 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:17:18,352 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 16:17:18,427 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 16:17:18,427 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:17:18,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 16:17:18,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:17:18,439 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 16:17:18,440 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 [2022-12-14 16:17:18,523 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:18,523 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:17:18,669 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:18,669 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [603581414] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:17:18,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2055659190] [2022-12-14 16:17:18,670 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:17:18,671 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:17:18,671 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:17:18,671 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:17:18,671 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:17:18,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:17:18,699 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 [2022-12-14 16:17:18,723 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:17:18,751 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:18,774 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:18,802 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:17:18,841 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:17:18,841 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 [2022-12-14 16:17:18,878 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 [2022-12-14 16:17:18,892 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:18,973 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:17:18,973 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 [2022-12-14 16:17:19,092 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:17:19,092 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 [2022-12-14 16:17:19,913 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:17:22,655 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2614#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:17:22,655 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:17:22,655 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:17:22,655 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 23 [2022-12-14 16:17:22,655 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790974901] [2022-12-14 16:17:22,655 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:17:22,656 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-12-14 16:17:22,656 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:22,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-12-14 16:17:22,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=1235, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 16:17:22,657 INFO L87 Difference]: Start difference. First operand 63 states and 72 transitions. Second operand has 24 states, 23 states have (on average 2.652173913043478) internal successors, (61), 24 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:22,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:22,986 INFO L93 Difference]: Finished difference Result 102 states and 114 transitions. [2022-12-14 16:17:22,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 16:17:22,987 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.652173913043478) internal successors, (61), 24 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-12-14 16:17:22,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:22,988 INFO L225 Difference]: With dead ends: 102 [2022-12-14 16:17:22,988 INFO L226 Difference]: Without dead ends: 102 [2022-12-14 16:17:22,989 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 577 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=290, Invalid=1690, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 16:17:22,990 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 325 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 336 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 325 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 336 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:22,990 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [325 Valid, 60 Invalid, 338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 336 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 16:17:22,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-12-14 16:17:22,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 71. [2022-12-14 16:17:22,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 69 states have (on average 1.1884057971014492) internal successors, (82), 70 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:22,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 82 transitions. [2022-12-14 16:17:22,993 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 82 transitions. Word has length 23 [2022-12-14 16:17:22,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:22,993 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 82 transitions. [2022-12-14 16:17:22,993 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.652173913043478) internal successors, (61), 24 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:22,993 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 82 transitions. [2022-12-14 16:17:22,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-12-14 16:17:22,994 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:22,994 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:17:22,998 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 16:17:23,194 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:23,195 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:17:23,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:23,195 INFO L85 PathProgramCache]: Analyzing trace with hash 297700333, now seen corresponding path program 4 times [2022-12-14 16:17:23,195 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:23,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124340784] [2022-12-14 16:17:23,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:23,195 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:23,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:24,096 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:17:24,096 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:24,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1124340784] [2022-12-14 16:17:24,097 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1124340784] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:17:24,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [69191456] [2022-12-14 16:17:24,097 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 16:17:24,097 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:24,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:17:24,098 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:17:24,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 16:17:24,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:24,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 37 conjunts are in the unsatisfiable core [2022-12-14 16:17:24,159 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:17:24,252 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:24,379 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:24,379 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:17:24,433 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 [2022-12-14 16:17:24,435 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 [2022-12-14 16:17:24,524 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:24,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [69191456] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:17:24,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1390720374] [2022-12-14 16:17:24,526 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:17:24,526 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:17:24,526 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:17:24,526 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:17:24,526 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:17:24,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:17:24,554 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 [2022-12-14 16:17:24,580 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:24,604 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:24,618 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:24,655 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:24,681 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:24,714 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:24,729 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 [2022-12-14 16:17:24,755 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:24,803 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:17:24,804 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 [2022-12-14 16:17:24,968 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:17:27,380 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2998#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:17:27,380 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:17:27,380 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:17:27,380 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 12] total 27 [2022-12-14 16:17:27,381 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625625257] [2022-12-14 16:17:27,381 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:17:27,381 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-12-14 16:17:27,381 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:27,381 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-12-14 16:17:27,381 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=1498, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 16:17:27,381 INFO L87 Difference]: Start difference. First operand 71 states and 82 transitions. Second operand has 27 states, 27 states have (on average 2.074074074074074) internal successors, (56), 27 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) [2022-12-14 16:17:28,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:28,600 INFO L93 Difference]: Finished difference Result 233 states and 259 transitions. [2022-12-14 16:17:28,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-12-14 16:17:28,600 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.074074074074074) internal successors, (56), 27 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-12-14 16:17:28,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:28,600 INFO L225 Difference]: With dead ends: 233 [2022-12-14 16:17:28,601 INFO L226 Difference]: Without dead ends: 225 [2022-12-14 16:17:28,601 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 881 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=372, Invalid=3168, Unknown=0, NotChecked=0, Total=3540 [2022-12-14 16:17:28,601 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 319 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 714 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 319 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 719 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 714 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:28,602 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [319 Valid, 111 Invalid, 719 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 714 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 16:17:28,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2022-12-14 16:17:28,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 102. [2022-12-14 16:17:28,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 100 states have (on average 1.17) internal successors, (117), 101 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:28,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 117 transitions. [2022-12-14 16:17:28,604 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 117 transitions. Word has length 27 [2022-12-14 16:17:28,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:28,604 INFO L495 AbstractCegarLoop]: Abstraction has 102 states and 117 transitions. [2022-12-14 16:17:28,605 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.074074074074074) internal successors, (56), 27 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) [2022-12-14 16:17:28,605 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 117 transitions. [2022-12-14 16:17:28,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-12-14 16:17:28,605 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:28,605 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:17:28,609 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 16:17:28,805 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-12-14 16:17:28,807 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)] === [2022-12-14 16:17:28,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:28,808 INFO L85 PathProgramCache]: Analyzing trace with hash 1136510355, now seen corresponding path program 2 times [2022-12-14 16:17:28,808 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:28,808 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246482740] [2022-12-14 16:17:28,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:28,809 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:28,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:29,075 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:29,076 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:29,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246482740] [2022-12-14 16:17:29,076 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1246482740] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:17:29,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [48795839] [2022-12-14 16:17:29,076 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 16:17:29,076 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:29,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:17:29,077 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:17:29,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 16:17:29,145 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 16:17:29,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:17:29,146 INFO L263 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 57 conjunts are in the unsatisfiable core [2022-12-14 16:17:29,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:17:29,162 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 16:17:29,162 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 [2022-12-14 16:17:29,279 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:29,331 INFO L321 Elim1Store]: treesize reduction 42, result has 19.2 percent of original size [2022-12-14 16:17:29,331 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 [2022-12-14 16:17:30,081 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 16:17:30,097 INFO L321 Elim1Store]: treesize reduction 26, result has 53.6 percent of original size [2022-12-14 16:17:30,098 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 46 treesize of output 46 [2022-12-14 16:17:30,335 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:17:30,335 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:17:30,746 INFO L321 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2022-12-14 16:17:30,746 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 356 treesize of output 312 [2022-12-14 16:17:31,089 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:17:31,089 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [48795839] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:17:31,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1575137817] [2022-12-14 16:17:31,091 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 16:17:31,091 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:17:31,091 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:17:31,091 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:17:31,091 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:17:31,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:17:31,110 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 [2022-12-14 16:17:31,136 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:31,160 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:31,176 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:31,203 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:31,233 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:31,257 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 [2022-12-14 16:17:31,270 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:31,294 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:31,329 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:17:31,329 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 [2022-12-14 16:17:31,557 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:17:34,115 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3582#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:17:34,115 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:17:34,115 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:17:34,115 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13, 13] total 34 [2022-12-14 16:17:34,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794335919] [2022-12-14 16:17:34,115 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:17:34,116 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 16:17:34,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:34,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 16:17:34,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=2237, Unknown=0, NotChecked=0, Total=2450 [2022-12-14 16:17:34,118 INFO L87 Difference]: Start difference. First operand 102 states and 117 transitions. Second operand has 35 states, 35 states have (on average 2.3714285714285714) internal successors, (83), 34 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:35,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:35,193 INFO L93 Difference]: Finished difference Result 165 states and 185 transitions. [2022-12-14 16:17:35,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 16:17:35,194 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.3714285714285714) internal successors, (83), 34 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-12-14 16:17:35,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:35,194 INFO L225 Difference]: With dead ends: 165 [2022-12-14 16:17:35,194 INFO L226 Difference]: Without dead ends: 131 [2022-12-14 16:17:35,195 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 910 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=378, Invalid=3404, Unknown=0, NotChecked=0, Total=3782 [2022-12-14 16:17:35,195 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 138 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 369 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 369 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:35,195 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [138 Valid, 67 Invalid, 378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 369 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 16:17:35,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2022-12-14 16:17:35,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 129. [2022-12-14 16:17:35,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 127 states have (on average 1.1574803149606299) internal successors, (147), 128 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:35,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 147 transitions. [2022-12-14 16:17:35,198 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 147 transitions. Word has length 28 [2022-12-14 16:17:35,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:35,198 INFO L495 AbstractCegarLoop]: Abstraction has 129 states and 147 transitions. [2022-12-14 16:17:35,198 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.3714285714285714) internal successors, (83), 34 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:35,198 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 147 transitions. [2022-12-14 16:17:35,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-12-14 16:17:35,199 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:35,199 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:17:35,203 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 16:17:35,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-12-14 16:17:35,401 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:17:35,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:35,402 INFO L85 PathProgramCache]: Analyzing trace with hash -1739438341, now seen corresponding path program 5 times [2022-12-14 16:17:35,402 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:35,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158027774] [2022-12-14 16:17:35,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:35,403 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:35,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:35,716 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 1 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:35,716 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:35,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158027774] [2022-12-14 16:17:35,717 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1158027774] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:17:35,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590447014] [2022-12-14 16:17:35,717 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 16:17:35,717 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:35,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:17:35,718 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:17:35,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 16:17:35,810 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 16:17:35,810 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:17:35,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 16:17:35,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:17:35,961 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:35,961 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:17:36,106 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 [2022-12-14 16:17:36,137 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:36,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [590447014] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:17:36,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1897856139] [2022-12-14 16:17:36,139 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:17:36,139 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:17:36,139 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:17:36,139 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:17:36,139 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:17:36,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:17:36,164 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 [2022-12-14 16:17:36,185 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-12-14 16:17:36,212 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:36,238 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:36,262 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 [2022-12-14 16:17:36,300 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:17:36,300 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 [2022-12-14 16:17:36,334 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:36,350 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:36,413 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:17:36,414 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 [2022-12-14 16:17:36,527 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:17:36,528 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 [2022-12-14 16:17:37,381 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:17:40,105 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4111#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:17:40,105 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:17:40,105 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:17:40,106 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 27 [2022-12-14 16:17:40,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728777232] [2022-12-14 16:17:40,106 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:17:40,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 16:17:40,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:40,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 16:17:40,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=1530, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 16:17:40,107 INFO L87 Difference]: Start difference. First operand 129 states and 147 transitions. Second operand has 28 states, 27 states have (on average 2.7777777777777777) internal successors, (75), 28 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:40,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:40,603 INFO L93 Difference]: Finished difference Result 184 states and 204 transitions. [2022-12-14 16:17:40,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-12-14 16:17:40,603 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 2.7777777777777777) internal successors, (75), 28 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2022-12-14 16:17:40,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:40,605 INFO L225 Difference]: With dead ends: 184 [2022-12-14 16:17:40,605 INFO L226 Difference]: Without dead ends: 184 [2022-12-14 16:17:40,605 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 104 GetRequests, 51 SyntacticMatches, 4 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 847 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=352, Invalid=2198, Unknown=0, NotChecked=0, Total=2550 [2022-12-14 16:17:40,605 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 294 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 551 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 294 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 552 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 551 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:40,606 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [294 Valid, 103 Invalid, 552 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 551 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 16:17:40,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2022-12-14 16:17:40,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 141. [2022-12-14 16:17:40,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 139 states have (on average 1.158273381294964) internal successors, (161), 140 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:40,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 161 transitions. [2022-12-14 16:17:40,608 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 161 transitions. Word has length 29 [2022-12-14 16:17:40,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:40,608 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 161 transitions. [2022-12-14 16:17:40,609 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 2.7777777777777777) internal successors, (75), 28 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:40,609 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 161 transitions. [2022-12-14 16:17:40,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-12-14 16:17:40,609 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:40,610 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:17:40,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-12-14 16:17:40,810 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:40,811 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)] === [2022-12-14 16:17:40,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:40,813 INFO L85 PathProgramCache]: Analyzing trace with hash -1151087095, now seen corresponding path program 3 times [2022-12-14 16:17:40,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:40,813 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1289556982] [2022-12-14 16:17:40,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:40,814 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:40,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:40,997 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:40,997 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:40,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1289556982] [2022-12-14 16:17:40,997 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1289556982] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:17:40,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1532730316] [2022-12-14 16:17:40,998 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 16:17:40,998 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:40,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:17:40,999 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:17:41,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 16:17:41,074 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 16:17:41,074 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:17:41,076 INFO L263 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 25 conjunts are in the unsatisfiable core [2022-12-14 16:17:41,077 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:17:41,152 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:41,152 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:17:41,235 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 [2022-12-14 16:17:41,261 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:41,261 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1532730316] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:17:41,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1434805629] [2022-12-14 16:17:41,263 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 16:17:41,263 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:17:41,263 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:17:41,263 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:17:41,263 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:17:41,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:17:41,288 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 [2022-12-14 16:17:41,312 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-12-14 16:17:41,345 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:41,374 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 [2022-12-14 16:17:41,408 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 11 treesize of output 7 [2022-12-14 16:17:41,447 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:17:41,447 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 [2022-12-14 16:17:41,480 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 [2022-12-14 16:17:41,495 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:41,568 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:17:41,568 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 [2022-12-14 16:17:41,707 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:17:41,707 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 [2022-12-14 16:17:42,894 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:17:45,362 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4662#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:17:45,362 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:17:45,362 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:17:45,362 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8] total 18 [2022-12-14 16:17:45,363 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319994280] [2022-12-14 16:17:45,363 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:17:45,363 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 16:17:45,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:45,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 16:17:45,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1039, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 16:17:45,363 INFO L87 Difference]: Start difference. First operand 141 states and 161 transitions. Second operand has 20 states, 19 states have (on average 3.736842105263158) internal successors, (71), 19 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:45,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:45,566 INFO L93 Difference]: Finished difference Result 230 states and 258 transitions. [2022-12-14 16:17:45,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 16:17:45,566 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 3.736842105263158) internal successors, (71), 19 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-12-14 16:17:45,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:45,566 INFO L225 Difference]: With dead ends: 230 [2022-12-14 16:17:45,567 INFO L226 Difference]: Without dead ends: 230 [2022-12-14 16:17:45,567 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 59 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 437 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=243, Invalid=1479, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 16:17:45,567 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 238 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 252 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:45,567 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [238 Valid, 94 Invalid, 254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 252 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 16:17:45,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2022-12-14 16:17:45,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 185. [2022-12-14 16:17:45,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 183 states have (on average 1.1530054644808743) internal successors, (211), 184 states have internal predecessors, (211), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:45,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 211 transitions. [2022-12-14 16:17:45,570 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 211 transitions. Word has length 30 [2022-12-14 16:17:45,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:45,570 INFO L495 AbstractCegarLoop]: Abstraction has 185 states and 211 transitions. [2022-12-14 16:17:45,570 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 3.736842105263158) internal successors, (71), 19 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:45,571 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 211 transitions. [2022-12-14 16:17:45,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-12-14 16:17:45,571 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:45,571 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:17:45,576 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2022-12-14 16:17:45,771 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-12-14 16:17:45,773 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:17:45,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:45,774 INFO L85 PathProgramCache]: Analyzing trace with hash 169207682, now seen corresponding path program 6 times [2022-12-14 16:17:45,774 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:45,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1448659576] [2022-12-14 16:17:45,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:45,775 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:45,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:46,067 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:46,067 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:46,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1448659576] [2022-12-14 16:17:46,068 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1448659576] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:17:46,068 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1704178199] [2022-12-14 16:17:46,068 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 16:17:46,068 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:46,068 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:17:46,069 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:17:46,070 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 16:17:46,148 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 16:17:46,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:17:46,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 41 conjunts are in the unsatisfiable core [2022-12-14 16:17:46,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:17:46,217 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:46,302 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:46,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:17:46,338 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 [2022-12-14 16:17:46,339 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 [2022-12-14 16:17:46,393 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:46,393 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1704178199] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:17:46,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1023752839] [2022-12-14 16:17:46,394 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:17:46,394 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:17:46,395 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:17:46,395 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:17:46,395 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:17:46,407 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:17:46,407 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 [2022-12-14 16:17:46,435 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 11 treesize of output 7 [2022-12-14 16:17:46,458 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:46,484 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:46,511 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:17:46,550 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:17:46,550 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 [2022-12-14 16:17:46,582 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:46,596 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:46,668 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:17:46,668 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 [2022-12-14 16:17:46,786 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:17:46,787 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 [2022-12-14 16:17:47,606 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:17:51,003 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5325#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:17:51,003 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:17:51,003 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:17:51,003 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2022-12-14 16:17:51,004 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946261599] [2022-12-14 16:17:51,004 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:17:51,004 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-12-14 16:17:51,004 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:51,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-12-14 16:17:51,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=1480, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 16:17:51,006 INFO L87 Difference]: Start difference. First operand 185 states and 211 transitions. Second operand has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 27 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) [2022-12-14 16:17:51,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:51,489 INFO L93 Difference]: Finished difference Result 297 states and 328 transitions. [2022-12-14 16:17:51,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-12-14 16:17:51,489 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 27 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) Word has length 33 [2022-12-14 16:17:51,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:51,491 INFO L225 Difference]: With dead ends: 297 [2022-12-14 16:17:51,491 INFO L226 Difference]: Without dead ends: 272 [2022-12-14 16:17:51,492 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 69 SyntacticMatches, 3 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 695 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=301, Invalid=2351, Unknown=0, NotChecked=0, Total=2652 [2022-12-14 16:17:51,492 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 201 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 745 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 748 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 745 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:51,492 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [201 Valid, 309 Invalid, 748 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 745 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 16:17:51,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 272 states. [2022-12-14 16:17:51,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 272 to 243. [2022-12-14 16:17:51,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 241 states have (on average 1.1493775933609958) internal successors, (277), 242 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:51,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 277 transitions. [2022-12-14 16:17:51,496 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 277 transitions. Word has length 33 [2022-12-14 16:17:51,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:51,496 INFO L495 AbstractCegarLoop]: Abstraction has 243 states and 277 transitions. [2022-12-14 16:17:51,496 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 27 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) [2022-12-14 16:17:51,496 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 277 transitions. [2022-12-14 16:17:51,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 16:17:51,496 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:51,497 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:17:51,501 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 16:17:51,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-12-14 16:17:51,698 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:17:51,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:51,699 INFO L85 PathProgramCache]: Analyzing trace with hash 675848208, now seen corresponding path program 7 times [2022-12-14 16:17:51,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:51,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549171611] [2022-12-14 16:17:51,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:51,701 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:51,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:51,962 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:51,962 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:51,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549171611] [2022-12-14 16:17:51,962 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1549171611] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:17:51,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1886145029] [2022-12-14 16:17:51,962 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 16:17:51,962 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:51,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:17:51,963 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:17:51,964 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 16:17:52,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:52,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 35 conjunts are in the unsatisfiable core [2022-12-14 16:17:52,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:17:52,151 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 9 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:52,151 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:17:52,288 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 [2022-12-14 16:17:52,333 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 9 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:52,333 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1886145029] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:17:52,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1808666297] [2022-12-14 16:17:52,334 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:17:52,334 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:17:52,335 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:17:52,335 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:17:52,335 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:17:52,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:17:52,358 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 [2022-12-14 16:17:52,382 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 11 treesize of output 7 [2022-12-14 16:17:52,414 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:52,439 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 [2022-12-14 16:17:52,468 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:17:52,507 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:17:52,507 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 [2022-12-14 16:17:52,544 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 [2022-12-14 16:17:52,561 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 [2022-12-14 16:17:52,639 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:17:52,639 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 [2022-12-14 16:17:52,762 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:17:52,763 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 [2022-12-14 16:17:53,635 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:17:56,947 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6134#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:17:56,947 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:17:56,947 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:17:56,947 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 28 [2022-12-14 16:17:56,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724580319] [2022-12-14 16:17:56,948 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:17:56,948 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-12-14 16:17:56,948 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:17:56,948 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-12-14 16:17:56,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202, Invalid=1604, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 16:17:56,949 INFO L87 Difference]: Start difference. First operand 243 states and 277 transitions. Second operand has 29 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 29 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) [2022-12-14 16:17:57,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:17:57,494 INFO L93 Difference]: Finished difference Result 334 states and 371 transitions. [2022-12-14 16:17:57,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-12-14 16:17:57,495 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 29 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) Word has length 35 [2022-12-14 16:17:57,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:17:57,496 INFO L225 Difference]: With dead ends: 334 [2022-12-14 16:17:57,496 INFO L226 Difference]: Without dead ends: 334 [2022-12-14 16:17:57,497 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 69 SyntacticMatches, 5 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 858 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=409, Invalid=2453, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 16:17:57,497 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 344 mSDsluCounter, 235 mSDsCounter, 0 mSdLazyCounter, 1103 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 344 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 1104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 16:17:57,497 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [344 Valid, 261 Invalid, 1104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1103 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 16:17:57,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2022-12-14 16:17:57,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 259. [2022-12-14 16:17:57,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 257 states have (on average 1.1517509727626458) internal successors, (296), 258 states have internal predecessors, (296), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:17:57,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 296 transitions. [2022-12-14 16:17:57,504 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 296 transitions. Word has length 35 [2022-12-14 16:17:57,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:17:57,504 INFO L495 AbstractCegarLoop]: Abstraction has 259 states and 296 transitions. [2022-12-14 16:17:57,505 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 29 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) [2022-12-14 16:17:57,505 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 296 transitions. [2022-12-14 16:17:57,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 16:17:57,505 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:17:57,505 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:17:57,510 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 16:17:57,706 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:57,707 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:17:57,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:17:57,708 INFO L85 PathProgramCache]: Analyzing trace with hash -1772114409, now seen corresponding path program 8 times [2022-12-14 16:17:57,708 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:17:57,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873446612] [2022-12-14 16:17:57,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:17:57,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:17:57,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:17:58,063 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:58,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:17:58,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1873446612] [2022-12-14 16:17:58,063 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1873446612] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:17:58,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1788870006] [2022-12-14 16:17:58,064 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 16:17:58,064 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:17:58,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:17:58,064 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:17:58,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 16:17:58,189 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 16:17:58,189 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:17:58,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 49 conjunts are in the unsatisfiable core [2022-12-14 16:17:58,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:17:58,271 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 [2022-12-14 16:17:58,389 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:58,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:17:58,446 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 [2022-12-14 16:17:58,448 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 [2022-12-14 16:17:58,509 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:17:58,509 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1788870006] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:17:58,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1618740889] [2022-12-14 16:17:58,510 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:17:58,510 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:17:58,510 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:17:58,510 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:17:58,510 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:17:58,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:17:58,530 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 [2022-12-14 16:17:58,552 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-12-14 16:17:58,583 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:58,606 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:58,640 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:58,676 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 [2022-12-14 16:17:58,721 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:58,743 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 [2022-12-14 16:17:58,777 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:17:58,817 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:17:58,817 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 [2022-12-14 16:17:58,953 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:18:00,924 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7021#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:18:00,924 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:18:00,924 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:18:00,925 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2022-12-14 16:18:00,925 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318374524] [2022-12-14 16:18:00,925 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:18:00,925 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-12-14 16:18:00,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:18:00,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-12-14 16:18:00,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=1718, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 16:18:00,927 INFO L87 Difference]: Start difference. First operand 259 states and 296 transitions. Second operand has 30 states, 30 states have (on average 2.4) internal successors, (72), 30 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) [2022-12-14 16:18:01,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:18:01,505 INFO L93 Difference]: Finished difference Result 400 states and 444 transitions. [2022-12-14 16:18:01,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 16:18:01,506 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 2.4) internal successors, (72), 30 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) Word has length 39 [2022-12-14 16:18:01,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:18:01,506 INFO L225 Difference]: With dead ends: 400 [2022-12-14 16:18:01,506 INFO L226 Difference]: Without dead ends: 371 [2022-12-14 16:18:01,507 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 86 SyntacticMatches, 3 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 814 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=338, Invalid=2854, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 16:18:01,507 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 350 mSDsluCounter, 431 mSDsCounter, 0 mSdLazyCounter, 1056 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 350 SdHoareTripleChecker+Valid, 469 SdHoareTripleChecker+Invalid, 1060 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 1056 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 16:18:01,507 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [350 Valid, 469 Invalid, 1060 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 1056 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 16:18:01,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2022-12-14 16:18:01,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 329. [2022-12-14 16:18:01,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 327 states have (on average 1.1529051987767585) internal successors, (377), 328 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:18:01,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 377 transitions. [2022-12-14 16:18:01,512 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 377 transitions. Word has length 39 [2022-12-14 16:18:01,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:18:01,512 INFO L495 AbstractCegarLoop]: Abstraction has 329 states and 377 transitions. [2022-12-14 16:18:01,512 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 2.4) internal successors, (72), 30 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) [2022-12-14 16:18:01,512 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 377 transitions. [2022-12-14 16:18:01,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 16:18:01,513 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:18:01,513 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:18:01,517 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 16:18:01,713 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-12-14 16:18:01,714 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:18:01,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:18:01,715 INFO L85 PathProgramCache]: Analyzing trace with hash 155482516, now seen corresponding path program 4 times [2022-12-14 16:18:01,715 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:18:01,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [970053148] [2022-12-14 16:18:01,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:18:01,716 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:18:01,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:18:02,799 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 3 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:18:02,799 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:18:02,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [970053148] [2022-12-14 16:18:02,799 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [970053148] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:18:02,799 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [897895992] [2022-12-14 16:18:02,799 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 16:18:02,799 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:18:02,799 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:18:02,800 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:18:02,801 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 16:18:02,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:18:02,866 INFO L263 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 38 conjunts are in the unsatisfiable core [2022-12-14 16:18:02,868 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:18:03,032 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:03,091 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:18:03,091 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 [2022-12-14 16:18:03,242 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-12-14 16:18:03,263 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 17 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:18:03,263 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:18:03,572 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 52 treesize of output 46 [2022-12-14 16:18:03,781 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 17 proven. 17 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:18:03,781 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [897895992] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:18:03,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [461978925] [2022-12-14 16:18:03,782 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 16:18:03,782 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:18:03,782 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:18:03,782 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:18:03,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:18:03,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:18:03,813 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 [2022-12-14 16:18:03,845 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:03,871 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:03,885 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:03,920 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 11 treesize of output 7 [2022-12-14 16:18:03,949 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:03,964 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:03,993 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:04,026 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:18:04,026 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 [2022-12-14 16:18:04,307 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:18:07,593 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8058#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:18:07,593 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:18:07,593 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:18:07,593 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 12, 12] total 39 [2022-12-14 16:18:07,593 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2061861673] [2022-12-14 16:18:07,593 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:18:07,594 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-12-14 16:18:07,594 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:18:07,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-12-14 16:18:07,595 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=2787, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 16:18:07,595 INFO L87 Difference]: Start difference. First operand 329 states and 377 transitions. Second operand has 40 states, 40 states have (on average 2.5) internal successors, (100), 39 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:18:10,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:18:10,663 INFO L93 Difference]: Finished difference Result 554 states and 620 transitions. [2022-12-14 16:18:10,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-12-14 16:18:10,663 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 2.5) internal successors, (100), 39 states have internal predecessors, (100), 0 states have call successors, (0), 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 39 [2022-12-14 16:18:10,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:18:10,664 INFO L225 Difference]: With dead ends: 554 [2022-12-14 16:18:10,664 INFO L226 Difference]: Without dead ends: 398 [2022-12-14 16:18:10,665 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 78 SyntacticMatches, 4 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1409 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=687, Invalid=6285, Unknown=0, NotChecked=0, Total=6972 [2022-12-14 16:18:10,666 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 435 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 1128 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 435 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 1138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 1128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 16:18:10,666 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [435 Valid, 231 Invalid, 1138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 1128 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 16:18:10,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2022-12-14 16:18:10,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 370. [2022-12-14 16:18:10,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 370 states, 368 states have (on average 1.1576086956521738) internal successors, (426), 369 states have internal predecessors, (426), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:18:10,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 370 states to 370 states and 426 transitions. [2022-12-14 16:18:10,671 INFO L78 Accepts]: Start accepts. Automaton has 370 states and 426 transitions. Word has length 39 [2022-12-14 16:18:10,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:18:10,672 INFO L495 AbstractCegarLoop]: Abstraction has 370 states and 426 transitions. [2022-12-14 16:18:10,672 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 2.5) internal successors, (100), 39 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:18:10,672 INFO L276 IsEmpty]: Start isEmpty. Operand 370 states and 426 transitions. [2022-12-14 16:18:10,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-12-14 16:18:10,672 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:18:10,672 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:18:10,677 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 16:18:10,873 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-12-14 16:18:10,874 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:18:10,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:18:10,875 INFO L85 PathProgramCache]: Analyzing trace with hash -1721940955, now seen corresponding path program 9 times [2022-12-14 16:18:10,875 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:18:10,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1589179362] [2022-12-14 16:18:10,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:18:10,876 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:18:10,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:18:11,253 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 9 proven. 61 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:18:11,253 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:18:11,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1589179362] [2022-12-14 16:18:11,253 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1589179362] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:18:11,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1426280241] [2022-12-14 16:18:11,253 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 16:18:11,254 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:18:11,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:18:11,254 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:18:11,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 16:18:11,356 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 16:18:11,356 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:18:11,358 INFO L263 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 41 conjunts are in the unsatisfiable core [2022-12-14 16:18:11,360 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:18:11,368 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 16:18:11,368 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 9 treesize of output 15 [2022-12-14 16:18:11,535 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 16 proven. 54 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:18:11,535 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:18:11,900 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 16 proven. 54 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:18:11,900 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1426280241] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:18:11,900 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [240494937] [2022-12-14 16:18:11,901 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:18:11,901 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:18:11,901 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:18:11,901 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:18:11,901 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:18:11,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:18:11,921 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 [2022-12-14 16:18:11,942 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:18:11,970 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:11,993 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:12,021 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:18:12,060 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:18:12,060 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 [2022-12-14 16:18:12,091 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 [2022-12-14 16:18:12,106 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 14 treesize of output 10 [2022-12-14 16:18:12,185 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:18:12,185 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 [2022-12-14 16:18:12,300 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:18:12,300 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 [2022-12-14 16:18:13,159 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:18:16,164 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9334#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:18:16,165 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:18:16,165 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:18:16,165 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 38 [2022-12-14 16:18:16,165 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943887400] [2022-12-14 16:18:16,165 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:18:16,165 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-12-14 16:18:16,165 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:18:16,166 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-12-14 16:18:16,167 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=2474, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 16:18:16,167 INFO L87 Difference]: Start difference. First operand 370 states and 426 transitions. Second operand has 39 states, 38 states have (on average 2.710526315789474) internal successors, (103), 39 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) [2022-12-14 16:18:16,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:18:16,899 INFO L93 Difference]: Finished difference Result 507 states and 567 transitions. [2022-12-14 16:18:16,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 16:18:16,899 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 38 states have (on average 2.710526315789474) internal successors, (103), 39 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 41 [2022-12-14 16:18:16,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:18:16,900 INFO L225 Difference]: With dead ends: 507 [2022-12-14 16:18:16,900 INFO L226 Difference]: Without dead ends: 507 [2022-12-14 16:18:16,901 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 84 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1261 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=626, Invalid=3664, Unknown=0, NotChecked=0, Total=4290 [2022-12-14 16:18:16,901 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 514 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 1236 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 514 SdHoareTripleChecker+Valid, 256 SdHoareTripleChecker+Invalid, 1237 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 16:18:16,902 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [514 Valid, 256 Invalid, 1237 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1236 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 16:18:16,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 507 states. [2022-12-14 16:18:16,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 507 to 390. [2022-12-14 16:18:16,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 390 states, 388 states have (on average 1.1597938144329898) internal successors, (450), 389 states have internal predecessors, (450), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:18:16,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 390 states to 390 states and 450 transitions. [2022-12-14 16:18:16,908 INFO L78 Accepts]: Start accepts. Automaton has 390 states and 450 transitions. Word has length 41 [2022-12-14 16:18:16,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:18:16,908 INFO L495 AbstractCegarLoop]: Abstraction has 390 states and 450 transitions. [2022-12-14 16:18:16,908 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 38 states have (on average 2.710526315789474) internal successors, (103), 39 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) [2022-12-14 16:18:16,908 INFO L276 IsEmpty]: Start isEmpty. Operand 390 states and 450 transitions. [2022-12-14 16:18:16,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-12-14 16:18:16,909 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:18:16,909 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:18:16,914 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-12-14 16:18:17,109 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:18:17,109 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:18:17,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:18:17,110 INFO L85 PathProgramCache]: Analyzing trace with hash -2031375522, now seen corresponding path program 5 times [2022-12-14 16:18:17,110 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:18:17,110 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678922525] [2022-12-14 16:18:17,110 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:18:17,110 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:18:17,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:18:17,268 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 1 proven. 38 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:18:17,268 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:18:17,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678922525] [2022-12-14 16:18:17,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1678922525] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:18:17,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [141879260] [2022-12-14 16:18:17,268 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 16:18:17,268 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:18:17,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:18:17,269 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:18:17,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 16:18:17,360 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 16:18:17,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:18:17,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 16:18:17,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:18:17,491 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:18:17,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:18:17,649 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 [2022-12-14 16:18:17,679 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:18:17,679 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [141879260] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:18:17,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [448880881] [2022-12-14 16:18:17,680 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 16:18:17,680 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:18:17,681 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:18:17,681 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:18:17,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:18:17,704 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:18:17,706 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 [2022-12-14 16:18:17,734 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:17,760 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:17,777 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:17,815 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 [2022-12-14 16:18:17,849 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 [2022-12-14 16:18:17,876 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:17,895 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:17,919 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 14 treesize of output 10 [2022-12-14 16:18:17,957 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:18:17,957 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 [2022-12-14 16:18:18,189 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:18:19,839 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10538#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:18:19,839 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:18:19,839 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:18:19,839 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 25 [2022-12-14 16:18:19,839 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103690290] [2022-12-14 16:18:19,839 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:18:19,839 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-12-14 16:18:19,839 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:18:19,840 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-12-14 16:18:19,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=208, Invalid=1514, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 16:18:19,840 INFO L87 Difference]: Start difference. First operand 390 states and 450 transitions. Second operand has 27 states, 26 states have (on average 4.3076923076923075) internal successors, (112), 26 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) [2022-12-14 16:18:20,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:18:20,156 INFO L93 Difference]: Finished difference Result 599 states and 680 transitions. [2022-12-14 16:18:20,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 16:18:20,157 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 4.3076923076923075) internal successors, (112), 26 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2022-12-14 16:18:20,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:18:20,158 INFO L225 Difference]: With dead ends: 599 [2022-12-14 16:18:20,158 INFO L226 Difference]: Without dead ends: 599 [2022-12-14 16:18:20,159 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 86 SyntacticMatches, 4 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 761 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=359, Invalid=2191, Unknown=0, NotChecked=0, Total=2550 [2022-12-14 16:18:20,159 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 256 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 516 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 256 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 516 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 16:18:20,159 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [256 Valid, 194 Invalid, 517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 516 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 16:18:20,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 599 states. [2022-12-14 16:18:20,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 599 to 480. [2022-12-14 16:18:20,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 480 states, 478 states have (on average 1.1569037656903767) internal successors, (553), 479 states have internal predecessors, (553), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:18:20,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 480 states to 480 states and 553 transitions. [2022-12-14 16:18:20,170 INFO L78 Accepts]: Start accepts. Automaton has 480 states and 553 transitions. Word has length 41 [2022-12-14 16:18:20,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:18:20,171 INFO L495 AbstractCegarLoop]: Abstraction has 480 states and 553 transitions. [2022-12-14 16:18:20,171 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 4.3076923076923075) internal successors, (112), 26 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) [2022-12-14 16:18:20,171 INFO L276 IsEmpty]: Start isEmpty. Operand 480 states and 553 transitions. [2022-12-14 16:18:20,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2022-12-14 16:18:20,172 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:18:20,172 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:18:20,176 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-12-14 16:18:20,372 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:18:20,372 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:18:20,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:18:20,373 INFO L85 PathProgramCache]: Analyzing trace with hash 1705656236, now seen corresponding path program 10 times [2022-12-14 16:18:20,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:18:20,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634643501] [2022-12-14 16:18:20,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:18:20,373 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:18:20,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:18:20,777 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:18:20,777 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:18:20,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [634643501] [2022-12-14 16:18:20,778 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [634643501] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:18:20,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [230694136] [2022-12-14 16:18:20,778 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 16:18:20,778 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:18:20,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:18:20,779 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:18:20,780 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 16:18:20,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:18:20,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 55 conjunts are in the unsatisfiable core [2022-12-14 16:18:20,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:18:20,958 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:21,066 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:18:21,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:18:21,120 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 [2022-12-14 16:18:21,122 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2022-12-14 16:18:21,197 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:18:21,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [230694136] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:18:21,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1519827322] [2022-12-14 16:18:21,198 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:18:21,199 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:18:21,199 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:18:21,199 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:18:21,199 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:18:21,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:18:21,223 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 [2022-12-14 16:18:21,249 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:21,274 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 [2022-12-14 16:18:21,290 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:21,326 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 11 treesize of output 7 [2022-12-14 16:18:21,349 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 [2022-12-14 16:18:21,368 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:21,401 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:21,429 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:18:21,429 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 [2022-12-14 16:18:21,571 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:18:23,401 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11947#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:18:23,401 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:18:23,401 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:18:23,402 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 33 [2022-12-14 16:18:23,402 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638829049] [2022-12-14 16:18:23,402 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:18:23,402 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-12-14 16:18:23,402 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:18:23,402 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-12-14 16:18:23,402 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=1980, Unknown=0, NotChecked=0, Total=2162 [2022-12-14 16:18:23,403 INFO L87 Difference]: Start difference. First operand 480 states and 553 transitions. Second operand has 33 states, 33 states have (on average 2.4242424242424243) internal successors, (80), 33 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) [2022-12-14 16:18:24,288 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:18:24,288 INFO L93 Difference]: Finished difference Result 743 states and 834 transitions. [2022-12-14 16:18:24,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 16:18:24,289 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.4242424242424243) internal successors, (80), 33 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) Word has length 45 [2022-12-14 16:18:24,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:18:24,292 INFO L225 Difference]: With dead ends: 743 [2022-12-14 16:18:24,292 INFO L226 Difference]: Without dead ends: 661 [2022-12-14 16:18:24,292 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 103 SyntacticMatches, 3 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 938 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=369, Invalid=3413, Unknown=0, NotChecked=0, Total=3782 [2022-12-14 16:18:24,293 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 370 mSDsluCounter, 684 mSDsCounter, 0 mSdLazyCounter, 1624 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 370 SdHoareTripleChecker+Valid, 733 SdHoareTripleChecker+Invalid, 1629 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 1624 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 16:18:24,293 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [370 Valid, 733 Invalid, 1629 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 1624 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 16:18:24,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 661 states. [2022-12-14 16:18:24,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 661 to 589. [2022-12-14 16:18:24,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 589 states, 587 states have (on average 1.1584327086882453) internal successors, (680), 588 states have internal predecessors, (680), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:18:24,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 589 states to 589 states and 680 transitions. [2022-12-14 16:18:24,301 INFO L78 Accepts]: Start accepts. Automaton has 589 states and 680 transitions. Word has length 45 [2022-12-14 16:18:24,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:18:24,301 INFO L495 AbstractCegarLoop]: Abstraction has 589 states and 680 transitions. [2022-12-14 16:18:24,301 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.4242424242424243) internal successors, (80), 33 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) [2022-12-14 16:18:24,301 INFO L276 IsEmpty]: Start isEmpty. Operand 589 states and 680 transitions. [2022-12-14 16:18:24,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2022-12-14 16:18:24,302 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:18:24,302 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:18:24,307 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-12-14 16:18:24,502 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:18:24,502 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:18:24,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:18:24,503 INFO L85 PathProgramCache]: Analyzing trace with hash 1110872890, now seen corresponding path program 11 times [2022-12-14 16:18:24,503 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:18:24,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1676520409] [2022-12-14 16:18:24,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:18:24,503 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:18:24,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:18:24,808 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 16 proven. 86 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:18:24,809 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:18:24,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1676520409] [2022-12-14 16:18:24,809 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1676520409] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:18:24,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [648971982] [2022-12-14 16:18:24,809 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 16:18:24,809 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:18:24,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:18:24,810 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:18:24,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 16:18:24,991 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 16:18:24,991 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:18:24,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 40 conjunts are in the unsatisfiable core [2022-12-14 16:18:24,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:18:25,227 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 25 proven. 77 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:18:25,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:18:25,494 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 [2022-12-14 16:18:25,554 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 25 proven. 77 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:18:25,554 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [648971982] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:18:25,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [593790064] [2022-12-14 16:18:25,555 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:18:25,555 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:18:25,556 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:18:25,556 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:18:25,556 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:18:25,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:18:25,572 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 [2022-12-14 16:18:25,596 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-12-14 16:18:25,624 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:25,647 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 [2022-12-14 16:18:25,676 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:18:25,719 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:18:25,719 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 [2022-12-14 16:18:25,755 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:25,774 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:25,846 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:18:25,847 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-12-14 16:18:25,956 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:18:25,957 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 [2022-12-14 16:18:26,840 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:18:30,412 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13642#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:18:30,412 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:18:30,412 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:18:30,412 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 42 [2022-12-14 16:18:30,412 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [274399730] [2022-12-14 16:18:30,412 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:18:30,412 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-12-14 16:18:30,412 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:18:30,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-12-14 16:18:30,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=2836, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 16:18:30,413 INFO L87 Difference]: Start difference. First operand 589 states and 680 transitions. Second operand has 43 states, 42 states have (on average 2.9285714285714284) internal successors, (123), 43 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:18:31,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:18:31,072 INFO L93 Difference]: Finished difference Result 778 states and 874 transitions. [2022-12-14 16:18:31,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 16:18:31,072 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 42 states have (on average 2.9285714285714284) internal successors, (123), 43 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2022-12-14 16:18:31,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:18:31,073 INFO L225 Difference]: With dead ends: 778 [2022-12-14 16:18:31,073 INFO L226 Difference]: Without dead ends: 778 [2022-12-14 16:18:31,074 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 93 SyntacticMatches, 7 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1763 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=747, Invalid=4365, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 16:18:31,074 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 520 mSDsluCounter, 283 mSDsCounter, 0 mSdLazyCounter, 1266 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 520 SdHoareTripleChecker+Valid, 319 SdHoareTripleChecker+Invalid, 1267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 16:18:31,074 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [520 Valid, 319 Invalid, 1267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1266 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 16:18:31,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 778 states. [2022-12-14 16:18:31,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 778 to 613. [2022-12-14 16:18:31,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 613 states, 611 states have (on average 1.160392798690671) internal successors, (709), 612 states have internal predecessors, (709), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:18:31,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 613 states to 613 states and 709 transitions. [2022-12-14 16:18:31,082 INFO L78 Accepts]: Start accepts. Automaton has 613 states and 709 transitions. Word has length 47 [2022-12-14 16:18:31,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:18:31,082 INFO L495 AbstractCegarLoop]: Abstraction has 613 states and 709 transitions. [2022-12-14 16:18:31,082 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 42 states have (on average 2.9285714285714284) internal successors, (123), 43 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:18:31,082 INFO L276 IsEmpty]: Start isEmpty. Operand 613 states and 709 transitions. [2022-12-14 16:18:31,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-12-14 16:18:31,083 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:18:31,083 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:18:31,087 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-12-14 16:18:31,283 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-12-14 16:18:31,285 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:18:31,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:18:31,286 INFO L85 PathProgramCache]: Analyzing trace with hash -928527393, now seen corresponding path program 6 times [2022-12-14 16:18:31,286 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:18:31,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [990479730] [2022-12-14 16:18:31,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:18:31,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:18:31,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:18:31,760 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 4 proven. 63 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:18:31,761 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:18:31,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [990479730] [2022-12-14 16:18:31,761 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [990479730] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:18:31,761 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [218378782] [2022-12-14 16:18:31,761 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 16:18:31,761 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:18:31,761 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:18:31,762 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:18:31,763 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 16:18:31,865 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 16:18:31,865 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:18:31,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 97 conjunts are in the unsatisfiable core [2022-12-14 16:18:31,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:18:31,980 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 14 treesize of output 10 [2022-12-14 16:18:32,024 INFO L321 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2022-12-14 16:18:32,024 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 24 treesize of output 23 [2022-12-14 16:18:33,230 INFO L321 Elim1Store]: treesize reduction 102, result has 27.7 percent of original size [2022-12-14 16:18:33,230 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 70 treesize of output 61 [2022-12-14 16:18:33,265 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 4 proven. 63 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:18:33,266 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:18:33,856 INFO L321 Elim1Store]: treesize reduction 55, result has 42.1 percent of original size [2022-12-14 16:18:33,856 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 512 treesize of output 399 [2022-12-14 16:18:33,871 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 16:18:33,871 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 357 treesize of output 331 [2022-12-14 16:18:33,885 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 370 treesize of output 346 [2022-12-14 16:18:33,984 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 16:18:34,023 INFO L321 Elim1Store]: treesize reduction 10, result has 82.5 percent of original size [2022-12-14 16:18:34,024 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 143 treesize of output 142 [2022-12-14 16:18:34,572 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 31 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:18:34,572 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [218378782] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:18:34,572 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1204449162] [2022-12-14 16:18:34,573 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 16:18:34,573 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:18:34,573 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:18:34,574 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:18:34,574 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:18:34,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:18:34,594 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 [2022-12-14 16:18:34,628 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:18:34,671 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 [2022-12-14 16:18:34,710 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:34,747 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:18:34,801 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:18:34,801 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 [2022-12-14 16:18:34,848 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:34,864 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:18:34,938 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:18:34,938 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 [2022-12-14 16:18:35,053 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:18:35,054 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 [2022-12-14 16:18:36,225 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:18:39,791 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15430#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:18:39,791 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:18:39,791 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:18:39,792 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 23, 23] total 58 [2022-12-14 16:18:39,792 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386758297] [2022-12-14 16:18:39,792 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:18:39,792 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-12-14 16:18:39,792 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:18:39,793 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-12-14 16:18:39,793 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=337, Invalid=5065, Unknown=0, NotChecked=0, Total=5402 [2022-12-14 16:18:39,793 INFO L87 Difference]: Start difference. First operand 613 states and 709 transitions. Second operand has 59 states, 59 states have (on average 2.2033898305084745) internal successors, (130), 58 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:18:44,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:18:44,375 INFO L93 Difference]: Finished difference Result 1765 states and 2014 transitions. [2022-12-14 16:18:44,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-12-14 16:18:44,375 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 2.2033898305084745) internal successors, (130), 58 states have internal predecessors, (130), 0 states have call successors, (0), 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 [2022-12-14 16:18:44,375 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:18:44,377 INFO L225 Difference]: With dead ends: 1765 [2022-12-14 16:18:44,377 INFO L226 Difference]: Without dead ends: 1707 [2022-12-14 16:18:44,378 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2834 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=1146, Invalid=11064, Unknown=0, NotChecked=0, Total=12210 [2022-12-14 16:18:44,378 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 863 mSDsluCounter, 720 mSDsCounter, 0 mSdLazyCounter, 2161 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 863 SdHoareTripleChecker+Valid, 747 SdHoareTripleChecker+Invalid, 2167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 2161 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-12-14 16:18:44,379 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [863 Valid, 747 Invalid, 2167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 2161 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-12-14 16:18:44,379 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1707 states. [2022-12-14 16:18:44,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1707 to 1048. [2022-12-14 16:18:44,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1048 states, 1046 states have (on average 1.155831739961759) internal successors, (1209), 1047 states have internal predecessors, (1209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:18:44,391 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1048 states to 1048 states and 1209 transitions. [2022-12-14 16:18:44,392 INFO L78 Accepts]: Start accepts. Automaton has 1048 states and 1209 transitions. Word has length 50 [2022-12-14 16:18:44,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:18:44,392 INFO L495 AbstractCegarLoop]: Abstraction has 1048 states and 1209 transitions. [2022-12-14 16:18:44,392 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 2.2033898305084745) internal successors, (130), 58 states have internal predecessors, (130), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:18:44,392 INFO L276 IsEmpty]: Start isEmpty. Operand 1048 states and 1209 transitions. [2022-12-14 16:18:44,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2022-12-14 16:18:44,393 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:18:44,393 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:18:44,397 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-12-14 16:18:44,593 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-12-14 16:18:44,594 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:18:44,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:18:44,595 INFO L85 PathProgramCache]: Analyzing trace with hash 1416363073, now seen corresponding path program 12 times [2022-12-14 16:18:44,596 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:18:44,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1267666867] [2022-12-14 16:18:44,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:18:44,596 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:18:44,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:18:45,047 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 19 proven. 108 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:18:45,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:18:45,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1267666867] [2022-12-14 16:18:45,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1267666867] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:18:45,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [874989932] [2022-12-14 16:18:45,047 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 16:18:45,047 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:18:45,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:18:45,048 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:18:45,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 16:18:45,172 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 16:18:45,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:18:45,174 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 74 conjunts are in the unsatisfiable core [2022-12-14 16:18:45,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:18:45,336 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:19:15,926 INFO L321 Elim1Store]: treesize reduction 25, result has 49.0 percent of original size [2022-12-14 16:19:15,926 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 21 case distinctions, treesize of input 82 treesize of output 60 [2022-12-14 16:19:15,929 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 36 proven. 50 refuted. 41 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:19:15,929 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:19:27,050 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 91 treesize of output 79 [2022-12-14 16:19:27,054 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 16:19:27,054 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 91 treesize of output 67 [2022-12-14 16:19:27,423 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 79 proven. 48 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:19:27,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [874989932] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:19:27,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [692005511] [2022-12-14 16:19:27,425 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:19:27,425 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:19:27,425 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:19:27,425 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:19:27,425 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:19:27,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:19:27,447 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 [2022-12-14 16:19:27,468 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:19:27,502 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 [2022-12-14 16:19:27,525 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 [2022-12-14 16:19:27,557 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:19:27,588 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 [2022-12-14 16:19:27,621 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:19:27,650 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:19:27,678 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:19:27,712 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:19:27,713 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 [2022-12-14 16:19:27,848 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:19:30,471 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18703#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:19:30,471 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:19:30,471 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:19:30,471 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 30, 30] total 71 [2022-12-14 16:19:30,471 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729945631] [2022-12-14 16:19:30,471 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:19:30,471 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-12-14 16:19:30,471 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:19:30,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-12-14 16:19:30,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=579, Invalid=6496, Unknown=65, NotChecked=0, Total=7140 [2022-12-14 16:19:30,473 INFO L87 Difference]: Start difference. First operand 1048 states and 1209 transitions. Second operand has 71 states, 71 states have (on average 1.9295774647887325) internal successors, (137), 71 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:22:45,279 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.17s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-12-14 16:23:21,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:23:21,623 INFO L93 Difference]: Finished difference Result 1790 states and 1990 transitions. [2022-12-14 16:23:21,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2022-12-14 16:23:21,623 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.9295774647887325) internal successors, (137), 71 states have internal predecessors, (137), 0 states have call successors, (0), 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 51 [2022-12-14 16:23:21,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:23:21,628 INFO L225 Difference]: With dead ends: 1790 [2022-12-14 16:23:21,629 INFO L226 Difference]: Without dead ends: 1690 [2022-12-14 16:23:21,630 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8234 ImplicationChecksByTransitivity, 197.5s TimeCoverageRelationStatistics Valid=3278, Invalid=26993, Unknown=179, NotChecked=0, Total=30450 [2022-12-14 16:23:21,630 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 1489 mSDsluCounter, 940 mSDsCounter, 0 mSdLazyCounter, 4218 mSolverCounterSat, 7 mSolverCounterUnsat, 128 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 77.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1489 SdHoareTripleChecker+Valid, 996 SdHoareTripleChecker+Invalid, 4353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 4218 IncrementalHoareTripleChecker+Invalid, 128 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 78.0s IncrementalHoareTripleChecker+Time [2022-12-14 16:23:21,630 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1489 Valid, 996 Invalid, 4353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 4218 Invalid, 128 Unknown, 0 Unchecked, 78.0s Time] [2022-12-14 16:23:21,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1690 states. [2022-12-14 16:23:21,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1690 to 1280. [2022-12-14 16:23:21,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1280 states, 1278 states have (on average 1.158059467918623) internal successors, (1480), 1279 states have internal predecessors, (1480), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:23:21,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1280 states to 1280 states and 1480 transitions. [2022-12-14 16:23:21,643 INFO L78 Accepts]: Start accepts. Automaton has 1280 states and 1480 transitions. Word has length 51 [2022-12-14 16:23:21,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:23:21,643 INFO L495 AbstractCegarLoop]: Abstraction has 1280 states and 1480 transitions. [2022-12-14 16:23:21,643 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 1.9295774647887325) internal successors, (137), 71 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:23:21,643 INFO L276 IsEmpty]: Start isEmpty. Operand 1280 states and 1480 transitions. [2022-12-14 16:23:21,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2022-12-14 16:23:21,644 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:23:21,645 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:23:21,651 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-12-14 16:23:21,845 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:23:21,846 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:23:21,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:23:21,847 INFO L85 PathProgramCache]: Analyzing trace with hash 527726549, now seen corresponding path program 7 times [2022-12-14 16:23:21,847 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:23:21,848 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023823017] [2022-12-14 16:23:21,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:23:21,848 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:23:21,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:23:22,155 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 4 proven. 70 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:23:22,155 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:23:22,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023823017] [2022-12-14 16:23:22,155 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2023823017] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:23:22,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1889562143] [2022-12-14 16:23:22,156 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 16:23:22,156 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:23:22,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:23:22,156 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:23:22,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-12-14 16:23:22,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:23:22,254 INFO L263 TraceCheckSpWp]: Trace formula consists of 336 conjuncts, 35 conjunts are in the unsatisfiable core [2022-12-14 16:23:22,255 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:23:22,423 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 9 proven. 65 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:23:22,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:23:22,593 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 [2022-12-14 16:23:22,645 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 9 proven. 65 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:23:22,646 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1889562143] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:23:22,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [816127859] [2022-12-14 16:23:22,647 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 16:23:22,647 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:23:22,647 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:23:22,647 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:23:22,647 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:23:22,675 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:23:22,677 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 [2022-12-14 16:23:22,698 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:23:22,731 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:23:22,758 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:23:22,787 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 [2022-12-14 16:23:22,826 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:23:22,826 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 90 treesize of output 89 [2022-12-14 16:23:22,867 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 14 treesize of output 10 [2022-12-14 16:23:22,885 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:23:22,957 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:23:22,957 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 [2022-12-14 16:23:23,062 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:23:23,063 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 [2022-12-14 16:23:24,376 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:23:26,869 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22301#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:23:26,870 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:23:26,870 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:23:26,870 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 26 [2022-12-14 16:23:26,870 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41381249] [2022-12-14 16:23:26,870 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:23:26,870 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 16:23:26,870 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:23:26,870 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 16:23:26,871 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=1613, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 16:23:26,871 INFO L87 Difference]: Start difference. First operand 1280 states and 1480 transitions. Second operand has 28 states, 27 states have (on average 4.2592592592592595) internal successors, (115), 27 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:23:27,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:23:27,300 INFO L93 Difference]: Finished difference Result 1991 states and 2298 transitions. [2022-12-14 16:23:27,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-12-14 16:23:27,300 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 27 states have (on average 4.2592592592592595) internal successors, (115), 27 states have internal predecessors, (115), 0 states have call successors, (0), 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 52 [2022-12-14 16:23:27,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:23:27,302 INFO L225 Difference]: With dead ends: 1991 [2022-12-14 16:23:27,303 INFO L226 Difference]: Without dead ends: 1991 [2022-12-14 16:23:27,303 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 119 SyntacticMatches, 5 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 824 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=389, Invalid=2473, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 16:23:27,303 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 325 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 798 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 325 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 800 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 798 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 16:23:27,303 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [325 Valid, 293 Invalid, 800 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 798 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 16:23:27,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1991 states. [2022-12-14 16:23:27,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1991 to 1428. [2022-12-14 16:23:27,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1428 states, 1426 states have (on average 1.1577840112201963) internal successors, (1651), 1427 states have internal predecessors, (1651), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:23:27,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1428 states to 1428 states and 1651 transitions. [2022-12-14 16:23:27,319 INFO L78 Accepts]: Start accepts. Automaton has 1428 states and 1651 transitions. Word has length 52 [2022-12-14 16:23:27,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:23:27,319 INFO L495 AbstractCegarLoop]: Abstraction has 1428 states and 1651 transitions. [2022-12-14 16:23:27,319 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 27 states have (on average 4.2592592592592595) internal successors, (115), 27 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:23:27,320 INFO L276 IsEmpty]: Start isEmpty. Operand 1428 states and 1651 transitions. [2022-12-14 16:23:27,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2022-12-14 16:23:27,321 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:23:27,321 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:23:27,325 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-12-14 16:23:27,521 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-12-14 16:23:27,522 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:23:27,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:23:27,523 INFO L85 PathProgramCache]: Analyzing trace with hash -1797067441, now seen corresponding path program 13 times [2022-12-14 16:23:27,523 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:23:27,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109936359] [2022-12-14 16:23:27,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:23:27,524 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:23:27,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:23:27,928 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 25 proven. 115 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:23:27,928 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:23:27,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109936359] [2022-12-14 16:23:27,928 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1109936359] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:23:27,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [658227976] [2022-12-14 16:23:27,928 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 16:23:27,928 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:23:27,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:23:27,929 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:23:27,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-12-14 16:23:28,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:23:28,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 352 conjuncts, 50 conjunts are in the unsatisfiable core [2022-12-14 16:23:28,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:23:28,226 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 36 proven. 104 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:23:28,227 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:23:28,469 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 [2022-12-14 16:23:28,570 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 36 proven. 104 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:23:28,570 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [658227976] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:23:28,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [663571560] [2022-12-14 16:23:28,572 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:23:28,572 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:23:28,572 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:23:28,572 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:23:28,572 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:23:28,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:23:28,594 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 [2022-12-14 16:23:28,619 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 11 treesize of output 7 [2022-12-14 16:23:28,648 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 [2022-12-14 16:23:28,682 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 [2022-12-14 16:23:28,715 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:23:28,754 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:23:28,754 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 [2022-12-14 16:23:28,796 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:23:28,814 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:23:28,881 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:23:28,881 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 [2022-12-14 16:23:29,009 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:23:29,009 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 [2022-12-14 16:23:29,940 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:23:33,677 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26110#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:23:33,677 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:23:33,677 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:23:33,677 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 19] total 40 [2022-12-14 16:23:33,677 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399652518] [2022-12-14 16:23:33,677 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:23:33,677 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-12-14 16:23:33,678 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:23:33,678 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-12-14 16:23:33,678 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=298, Invalid=2672, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 16:23:33,678 INFO L87 Difference]: Start difference. First operand 1428 states and 1651 transitions. Second operand has 41 states, 40 states have (on average 2.85) internal successors, (114), 41 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:23:34,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:23:34,662 INFO L93 Difference]: Finished difference Result 1790 states and 2025 transitions. [2022-12-14 16:23:34,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-12-14 16:23:34,663 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 40 states have (on average 2.85) internal successors, (114), 41 states have internal predecessors, (114), 0 states have call successors, (0), 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 53 [2022-12-14 16:23:34,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:23:34,666 INFO L225 Difference]: With dead ends: 1790 [2022-12-14 16:23:34,666 INFO L226 Difference]: Without dead ends: 1790 [2022-12-14 16:23:34,666 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 114 SyntacticMatches, 8 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1623 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=742, Invalid=4370, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 16:23:34,666 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 547 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 1932 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 547 SdHoareTripleChecker+Valid, 436 SdHoareTripleChecker+Invalid, 1934 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 1932 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 16:23:34,666 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [547 Valid, 436 Invalid, 1934 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 1932 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 16:23:34,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1790 states. [2022-12-14 16:23:34,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1790 to 1468. [2022-12-14 16:23:34,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1468 states, 1466 states have (on average 1.159618008185539) internal successors, (1700), 1467 states have internal predecessors, (1700), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:23:34,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1468 states to 1468 states and 1700 transitions. [2022-12-14 16:23:34,679 INFO L78 Accepts]: Start accepts. Automaton has 1468 states and 1700 transitions. Word has length 53 [2022-12-14 16:23:34,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:23:34,680 INFO L495 AbstractCegarLoop]: Abstraction has 1468 states and 1700 transitions. [2022-12-14 16:23:34,680 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 40 states have (on average 2.85) internal successors, (114), 41 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:23:34,680 INFO L276 IsEmpty]: Start isEmpty. Operand 1468 states and 1700 transitions. [2022-12-14 16:23:34,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-12-14 16:23:34,681 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:23:34,681 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:23:34,685 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-12-14 16:23:34,881 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-12-14 16:23:34,882 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:23:34,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:23:34,882 INFO L85 PathProgramCache]: Analyzing trace with hash -2063977640, now seen corresponding path program 1 times [2022-12-14 16:23:34,882 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:23:34,882 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1950896747] [2022-12-14 16:23:34,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:23:34,882 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:23:34,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:23:35,974 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 37 proven. 46 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 16:23:35,974 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:23:35,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1950896747] [2022-12-14 16:23:35,975 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1950896747] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:23:35,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1606880961] [2022-12-14 16:23:35,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:23:35,975 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:23:35,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:23:35,976 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:23:35,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-12-14 16:23:36,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:23:36,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 356 conjuncts, 95 conjunts are in the unsatisfiable core [2022-12-14 16:23:36,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:23:36,332 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:23:36,403 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 16:23:36,403 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 16 treesize of output 22 [2022-12-14 16:23:36,409 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2022-12-14 16:23:37,788 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 10 proven. 73 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 16:23:37,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:23:40,571 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 16:23:40,571 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 161 treesize of output 106 [2022-12-14 16:23:40,584 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 16:23:40,584 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 210 treesize of output 183 [2022-12-14 16:23:40,611 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 16:23:40,612 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 155 treesize of output 145 [2022-12-14 16:23:40,940 INFO L321 Elim1Store]: treesize reduction 10, result has 9.1 percent of original size [2022-12-14 16:23:40,940 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 141 treesize of output 1 [2022-12-14 16:23:41,449 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 6 proven. 77 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 16:23:41,449 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1606880961] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:23:41,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1247182026] [2022-12-14 16:23:41,450 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 16:23:41,450 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:23:41,450 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:23:41,451 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:23:41,451 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:23:41,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:23:41,467 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 [2022-12-14 16:23:41,500 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 11 treesize of output 7 [2022-12-14 16:23:41,526 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:23:41,560 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 14 treesize of output 10 [2022-12-14 16:23:41,588 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 11 treesize of output 7 [2022-12-14 16:23:41,631 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:23:41,632 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 90 treesize of output 89 [2022-12-14 16:23:41,671 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 [2022-12-14 16:23:41,693 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:23:41,779 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:23:41,779 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 [2022-12-14 16:23:41,895 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:23:41,895 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 [2022-12-14 16:23:43,193 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:23:46,208 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29806#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:23:46,208 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:23:46,208 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:23:46,208 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 21, 23] total 59 [2022-12-14 16:23:46,208 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679416587] [2022-12-14 16:23:46,208 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:23:46,208 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-12-14 16:23:46,209 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:23:46,209 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-12-14 16:23:46,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=5306, Unknown=1, NotChecked=0, Total=5550 [2022-12-14 16:23:46,209 INFO L87 Difference]: Start difference. First operand 1468 states and 1700 transitions. Second operand has 60 states, 60 states have (on average 2.6166666666666667) internal successors, (157), 59 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:23:56,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:23:56,691 INFO L93 Difference]: Finished difference Result 1904 states and 2179 transitions. [2022-12-14 16:23:56,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-12-14 16:23:56,691 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 2.6166666666666667) internal successors, (157), 59 states have internal predecessors, (157), 0 states have call successors, (0), 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 [2022-12-14 16:23:56,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:23:56,696 INFO L225 Difference]: With dead ends: 1904 [2022-12-14 16:23:56,696 INFO L226 Difference]: Without dead ends: 1202 [2022-12-14 16:23:56,697 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 110 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3199 ImplicationChecksByTransitivity, 15.2s TimeCoverageRelationStatistics Valid=1259, Invalid=14742, Unknown=1, NotChecked=0, Total=16002 [2022-12-14 16:23:56,697 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 884 mSDsluCounter, 428 mSDsCounter, 0 mSdLazyCounter, 2332 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 884 SdHoareTripleChecker+Valid, 444 SdHoareTripleChecker+Invalid, 2349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 2332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-12-14 16:23:56,698 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [884 Valid, 444 Invalid, 2349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 2332 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-12-14 16:23:56,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1202 states. [2022-12-14 16:23:56,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1202 to 971. [2022-12-14 16:23:56,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 971 states, 969 states have (on average 1.1651186790505677) internal successors, (1129), 970 states have internal predecessors, (1129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:23:56,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 971 states to 971 states and 1129 transitions. [2022-12-14 16:23:56,714 INFO L78 Accepts]: Start accepts. Automaton has 971 states and 1129 transitions. Word has length 56 [2022-12-14 16:23:56,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:23:56,714 INFO L495 AbstractCegarLoop]: Abstraction has 971 states and 1129 transitions. [2022-12-14 16:23:56,715 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 2.6166666666666667) internal successors, (157), 59 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:23:56,715 INFO L276 IsEmpty]: Start isEmpty. Operand 971 states and 1129 transitions. [2022-12-14 16:23:56,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2022-12-14 16:23:56,716 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:23:56,716 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:23:56,721 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-12-14 16:23:56,916 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:23:56,918 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:23:56,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:23:56,919 INFO L85 PathProgramCache]: Analyzing trace with hash 1719878614, now seen corresponding path program 14 times [2022-12-14 16:23:56,919 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:23:56,920 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1129785277] [2022-12-14 16:23:56,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:23:56,920 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:23:56,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:23:57,461 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 22 proven. 147 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:23:57,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:23:57,461 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1129785277] [2022-12-14 16:23:57,462 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1129785277] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:23:57,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [195747908] [2022-12-14 16:23:57,462 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 16:23:57,462 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:23:57,462 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:23:57,463 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:23:57,464 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-12-14 16:23:57,681 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-12-14 16:23:57,681 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:23:57,683 INFO L263 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 67 conjunts are in the unsatisfiable core [2022-12-14 16:23:57,685 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:23:57,836 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:23:57,980 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 22 proven. 147 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:23:57,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:23:58,056 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 [2022-12-14 16:23:58,057 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 [2022-12-14 16:23:58,144 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 22 proven. 147 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:23:58,145 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [195747908] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:23:58,145 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [96873413] [2022-12-14 16:23:58,146 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:23:58,146 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:23:58,146 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:23:58,146 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:23:58,146 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:23:58,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:23:58,168 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 [2022-12-14 16:23:58,190 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 [2022-12-14 16:23:58,221 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 [2022-12-14 16:23:58,240 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:23:58,286 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:23:58,340 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:23:58,363 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 [2022-12-14 16:23:58,382 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 [2022-12-14 16:23:58,414 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:23:58,454 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:23:58,454 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 [2022-12-14 16:23:58,587 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:24:00,676 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33175#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:24:00,676 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:24:00,676 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:24:00,676 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 39 [2022-12-14 16:24:00,676 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132835982] [2022-12-14 16:24:00,676 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:24:00,676 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-12-14 16:24:00,676 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:24:00,677 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-12-14 16:24:00,677 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=2558, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 16:24:00,677 INFO L87 Difference]: Start difference. First operand 971 states and 1129 transitions. Second operand has 39 states, 39 states have (on average 2.4615384615384617) internal successors, (96), 39 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) [2022-12-14 16:24:02,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:24:02,058 INFO L93 Difference]: Finished difference Result 1449 states and 1646 transitions. [2022-12-14 16:24:02,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-12-14 16:24:02,058 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.4615384615384617) internal successors, (96), 39 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) Word has length 57 [2022-12-14 16:24:02,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:24:02,061 INFO L225 Difference]: With dead ends: 1449 [2022-12-14 16:24:02,061 INFO L226 Difference]: Without dead ends: 1278 [2022-12-14 16:24:02,061 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 137 SyntacticMatches, 3 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 1213 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=431, Invalid=4681, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 16:24:02,061 INFO L413 NwaCegarLoop]: 71 mSDtfsCounter, 568 mSDsluCounter, 1364 mSDsCounter, 0 mSdLazyCounter, 2886 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 568 SdHoareTripleChecker+Valid, 1435 SdHoareTripleChecker+Invalid, 2893 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 2886 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-12-14 16:24:02,061 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [568 Valid, 1435 Invalid, 2893 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 2886 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-12-14 16:24:02,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1278 states. [2022-12-14 16:24:02,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1278 to 1147. [2022-12-14 16:24:02,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1147 states, 1145 states have (on average 1.1676855895196507) internal successors, (1337), 1146 states have internal predecessors, (1337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:24:02,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1147 states to 1147 states and 1337 transitions. [2022-12-14 16:24:02,071 INFO L78 Accepts]: Start accepts. Automaton has 1147 states and 1337 transitions. Word has length 57 [2022-12-14 16:24:02,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:24:02,071 INFO L495 AbstractCegarLoop]: Abstraction has 1147 states and 1337 transitions. [2022-12-14 16:24:02,071 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.4615384615384617) internal successors, (96), 39 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) [2022-12-14 16:24:02,071 INFO L276 IsEmpty]: Start isEmpty. Operand 1147 states and 1337 transitions. [2022-12-14 16:24:02,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2022-12-14 16:24:02,072 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:24:02,072 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:24:02,077 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-12-14 16:24:02,272 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-12-14 16:24:02,273 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:24:02,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:24:02,274 INFO L85 PathProgramCache]: Analyzing trace with hash -1730629020, now seen corresponding path program 15 times [2022-12-14 16:24:02,275 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:24:02,275 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023152903] [2022-12-14 16:24:02,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:24:02,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:24:02,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:24:02,751 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 36 proven. 148 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:02,751 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:24:02,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023152903] [2022-12-14 16:24:02,751 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2023152903] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:24:02,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1767061597] [2022-12-14 16:24:02,751 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 16:24:02,751 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:24:02,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:24:02,752 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:24:02,753 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-12-14 16:24:02,868 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 16:24:02,868 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:24:02,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 385 conjuncts, 56 conjunts are in the unsatisfiable core [2022-12-14 16:24:02,872 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:24:02,879 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 16:24:02,880 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 [2022-12-14 16:24:03,095 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 49 proven. 135 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:03,095 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:24:03,542 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 49 proven. 135 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:03,543 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1767061597] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:24:03,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1240044776] [2022-12-14 16:24:03,544 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:24:03,544 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:24:03,544 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:24:03,544 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:24:03,544 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:24:03,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:24:03,566 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 [2022-12-14 16:24:03,587 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:03,615 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:03,630 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:03,662 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:03,699 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:03,719 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 [2022-12-14 16:24:03,736 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:03,757 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 14 treesize of output 10 [2022-12-14 16:24:03,789 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:24:03,790 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 [2022-12-14 16:24:03,950 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:24:06,516 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36225#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:24:06,516 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:24:06,517 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:24:06,517 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 21] total 53 [2022-12-14 16:24:06,517 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498280822] [2022-12-14 16:24:06,517 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:24:06,517 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-12-14 16:24:06,517 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:24:06,518 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-12-14 16:24:06,518 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=476, Invalid=4080, Unknown=0, NotChecked=0, Total=4556 [2022-12-14 16:24:06,518 INFO L87 Difference]: Start difference. First operand 1147 states and 1337 transitions. Second operand has 54 states, 53 states have (on average 2.7358490566037736) internal successors, (145), 54 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:24:08,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:24:08,090 INFO L93 Difference]: Finished difference Result 1466 states and 1663 transitions. [2022-12-14 16:24:08,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-12-14 16:24:08,090 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 53 states have (on average 2.7358490566037736) internal successors, (145), 54 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2022-12-14 16:24:08,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:24:08,093 INFO L225 Difference]: With dead ends: 1466 [2022-12-14 16:24:08,093 INFO L226 Difference]: Without dead ends: 1466 [2022-12-14 16:24:08,093 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2131 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=1162, Invalid=6320, Unknown=0, NotChecked=0, Total=7482 [2022-12-14 16:24:08,094 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 621 mSDsluCounter, 667 mSDsCounter, 0 mSdLazyCounter, 3132 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 621 SdHoareTripleChecker+Valid, 713 SdHoareTripleChecker+Invalid, 3133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-12-14 16:24:08,094 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [621 Valid, 713 Invalid, 3133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3132 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-12-14 16:24:08,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1466 states. [2022-12-14 16:24:08,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1466 to 1179. [2022-12-14 16:24:08,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1179 states, 1177 states have (on average 1.1690739167374682) internal successors, (1376), 1178 states have internal predecessors, (1376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:24:08,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1179 states to 1179 states and 1376 transitions. [2022-12-14 16:24:08,105 INFO L78 Accepts]: Start accepts. Automaton has 1179 states and 1376 transitions. Word has length 59 [2022-12-14 16:24:08,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:24:08,105 INFO L495 AbstractCegarLoop]: Abstraction has 1179 states and 1376 transitions. [2022-12-14 16:24:08,105 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 53 states have (on average 2.7358490566037736) internal successors, (145), 54 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:24:08,105 INFO L276 IsEmpty]: Start isEmpty. Operand 1179 states and 1376 transitions. [2022-12-14 16:24:08,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-12-14 16:24:08,106 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:24:08,106 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:24:08,111 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-12-14 16:24:08,307 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-12-14 16:24:08,308 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:24:08,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:24:08,308 INFO L85 PathProgramCache]: Analyzing trace with hash 1567102280, now seen corresponding path program 8 times [2022-12-14 16:24:08,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:24:08,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1793586132] [2022-12-14 16:24:08,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:24:08,309 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:24:08,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:24:08,927 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 5 proven. 106 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:08,927 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:24:08,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1793586132] [2022-12-14 16:24:08,927 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1793586132] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:24:08,927 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [322954358] [2022-12-14 16:24:08,928 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 16:24:08,928 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:24:08,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:24:08,928 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:24:08,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-12-14 16:24:09,090 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 16:24:09,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:24:09,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 381 conjuncts, 92 conjunts are in the unsatisfiable core [2022-12-14 16:24:09,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:24:09,101 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 [2022-12-14 16:24:09,408 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 [2022-12-14 16:24:09,463 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 [2022-12-14 16:24:10,616 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 16:24:10,620 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-12-14 16:24:10,620 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 17 [2022-12-14 16:24:10,663 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 5 proven. 107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:24:10,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:24:11,645 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 16:24:11,645 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 26 treesize of output 27 [2022-12-14 16:24:11,651 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 16:24:11,651 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 44 treesize of output 39 [2022-12-14 16:24:11,665 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 16:24:11,665 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 32 treesize of output 50 [2022-12-14 16:24:12,362 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 5 proven. 107 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 16:24:12,362 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [322954358] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:24:12,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1302765266] [2022-12-14 16:24:12,363 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 16:24:12,363 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:24:12,363 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:24:12,363 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:24:12,364 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:24:12,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:24:12,391 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 [2022-12-14 16:24:12,423 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 [2022-12-14 16:24:12,463 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:12,507 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:12,546 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 [2022-12-14 16:24:12,611 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:24:12,611 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 [2022-12-14 16:24:12,649 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:12,666 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 [2022-12-14 16:24:12,730 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:24:12,731 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 [2022-12-14 16:24:12,852 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:24:12,853 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 [2022-12-14 16:24:14,093 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:24:17,817 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39346#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:24:17,817 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:24:17,817 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:24:17,818 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 25, 24] total 63 [2022-12-14 16:24:17,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145296778] [2022-12-14 16:24:17,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:24:17,818 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-12-14 16:24:17,818 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:24:17,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-12-14 16:24:17,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=277, Invalid=5876, Unknown=9, NotChecked=0, Total=6162 [2022-12-14 16:24:17,819 INFO L87 Difference]: Start difference. First operand 1179 states and 1376 transitions. Second operand has 64 states, 64 states have (on average 2.671875) internal successors, (171), 63 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:24:23,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:24:23,133 INFO L93 Difference]: Finished difference Result 2960 states and 3413 transitions. [2022-12-14 16:24:23,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-12-14 16:24:23,133 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 2.671875) internal successors, (171), 63 states have internal predecessors, (171), 0 states have call successors, (0), 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 61 [2022-12-14 16:24:23,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:24:23,138 INFO L225 Difference]: With dead ends: 2960 [2022-12-14 16:24:23,139 INFO L226 Difference]: Without dead ends: 2899 [2022-12-14 16:24:23,139 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 124 SyntacticMatches, 1 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3879 ImplicationChecksByTransitivity, 10.0s TimeCoverageRelationStatistics Valid=1410, Invalid=16403, Unknown=9, NotChecked=0, Total=17822 [2022-12-14 16:24:23,140 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 2149 mSDsluCounter, 1045 mSDsCounter, 0 mSdLazyCounter, 3128 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2149 SdHoareTripleChecker+Valid, 1084 SdHoareTripleChecker+Invalid, 3154 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 3128 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-12-14 16:24:23,140 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2149 Valid, 1084 Invalid, 3154 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 3128 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-12-14 16:24:23,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2899 states. [2022-12-14 16:24:23,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2899 to 1981. [2022-12-14 16:24:23,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1981 states, 1979 states have (on average 1.167256189994947) internal successors, (2310), 1980 states have internal predecessors, (2310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:24:23,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1981 states to 1981 states and 2310 transitions. [2022-12-14 16:24:23,168 INFO L78 Accepts]: Start accepts. Automaton has 1981 states and 2310 transitions. Word has length 61 [2022-12-14 16:24:23,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:24:23,168 INFO L495 AbstractCegarLoop]: Abstraction has 1981 states and 2310 transitions. [2022-12-14 16:24:23,168 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 2.671875) internal successors, (171), 63 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:24:23,168 INFO L276 IsEmpty]: Start isEmpty. Operand 1981 states and 2310 transitions. [2022-12-14 16:24:23,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-12-14 16:24:23,170 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:24:23,171 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:24:23,176 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-12-14 16:24:23,371 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:24:23,372 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:24:23,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:24:23,373 INFO L85 PathProgramCache]: Analyzing trace with hash 1094088299, now seen corresponding path program 16 times [2022-12-14 16:24:23,374 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:24:23,374 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [548332799] [2022-12-14 16:24:23,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:24:23,375 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:24:23,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:24:24,053 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 25 proven. 192 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:24,054 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:24:24,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [548332799] [2022-12-14 16:24:24,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [548332799] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:24:24,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1767398306] [2022-12-14 16:24:24,054 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 16:24:24,054 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:24:24,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:24:24,055 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:24:24,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-12-14 16:24:24,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:24:24,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 73 conjunts are in the unsatisfiable core [2022-12-14 16:24:24,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:24:24,379 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 [2022-12-14 16:24:24,549 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 25 proven. 192 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:24,549 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:24:24,640 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 [2022-12-14 16:24:24,641 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 [2022-12-14 16:24:24,763 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 25 proven. 192 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:24,763 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1767398306] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:24:24,763 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [894299892] [2022-12-14 16:24:24,764 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:24:24,764 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:24:24,764 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:24:24,764 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:24:24,764 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:24:24,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:24:24,784 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 [2022-12-14 16:24:24,808 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:24:24,835 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:24,856 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:24,885 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:24:24,926 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:24:24,926 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 [2022-12-14 16:24:24,960 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 14 treesize of output 10 [2022-12-14 16:24:24,977 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 [2022-12-14 16:24:25,051 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:24:25,051 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 [2022-12-14 16:24:25,175 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:24:25,175 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 [2022-12-14 16:24:26,089 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:24:29,712 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44826#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:24:29,712 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:24:29,712 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:24:29,712 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 42 [2022-12-14 16:24:29,712 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219063977] [2022-12-14 16:24:29,712 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:24:29,713 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-12-14 16:24:29,713 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:24:29,713 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-12-14 16:24:29,713 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=200, Invalid=2880, Unknown=0, NotChecked=0, Total=3080 [2022-12-14 16:24:29,713 INFO L87 Difference]: Start difference. First operand 1981 states and 2310 transitions. Second operand has 42 states, 42 states have (on average 2.4761904761904763) internal successors, (104), 42 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) [2022-12-14 16:24:31,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:24:31,475 INFO L93 Difference]: Finished difference Result 2800 states and 3203 transitions. [2022-12-14 16:24:31,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-12-14 16:24:31,475 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.4761904761904763) internal successors, (104), 42 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2022-12-14 16:24:31,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:24:31,478 INFO L225 Difference]: With dead ends: 2800 [2022-12-14 16:24:31,478 INFO L226 Difference]: Without dead ends: 2601 [2022-12-14 16:24:31,479 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 154 SyntacticMatches, 3 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 1360 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=456, Invalid=5396, Unknown=0, NotChecked=0, Total=5852 [2022-12-14 16:24:31,479 INFO L413 NwaCegarLoop]: 82 mSDtfsCounter, 639 mSDsluCounter, 1726 mSDsCounter, 0 mSdLazyCounter, 3667 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 639 SdHoareTripleChecker+Valid, 1808 SdHoareTripleChecker+Invalid, 3675 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 3667 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-12-14 16:24:31,479 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [639 Valid, 1808 Invalid, 3675 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 3667 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-12-14 16:24:31,480 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2601 states. [2022-12-14 16:24:31,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2601 to 2336. [2022-12-14 16:24:31,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2336 states, 2334 states have (on average 1.1700942587832048) internal successors, (2731), 2335 states have internal predecessors, (2731), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:24:31,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2336 states to 2336 states and 2731 transitions. [2022-12-14 16:24:31,496 INFO L78 Accepts]: Start accepts. Automaton has 2336 states and 2731 transitions. Word has length 63 [2022-12-14 16:24:31,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:24:31,496 INFO L495 AbstractCegarLoop]: Abstraction has 2336 states and 2731 transitions. [2022-12-14 16:24:31,496 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.4761904761904763) internal successors, (104), 42 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) [2022-12-14 16:24:31,496 INFO L276 IsEmpty]: Start isEmpty. Operand 2336 states and 2731 transitions. [2022-12-14 16:24:31,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2022-12-14 16:24:31,497 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:24:31,497 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:24:31,502 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2022-12-14 16:24:31,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:24:31,698 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:24:31,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:24:31,699 INFO L85 PathProgramCache]: Analyzing trace with hash 491221906, now seen corresponding path program 9 times [2022-12-14 16:24:31,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:24:31,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [388436982] [2022-12-14 16:24:31,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:24:31,701 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:24:31,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:24:32,002 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 9 proven. 111 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:32,002 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:24:32,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [388436982] [2022-12-14 16:24:32,002 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [388436982] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:24:32,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2045252139] [2022-12-14 16:24:32,002 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 16:24:32,003 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:24:32,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:24:32,003 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:24:32,004 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-12-14 16:24:32,127 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 16:24:32,127 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:24:32,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 394 conjuncts, 40 conjunts are in the unsatisfiable core [2022-12-14 16:24:32,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:24:32,307 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 16 proven. 104 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:32,307 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:24:32,520 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 [2022-12-14 16:24:32,578 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 16 proven. 104 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:32,578 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2045252139] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:24:32,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [909669725] [2022-12-14 16:24:32,579 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 16:24:32,579 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:24:32,579 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:24:32,579 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:24:32,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:24:32,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:24:32,602 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 [2022-12-14 16:24:32,627 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 [2022-12-14 16:24:32,654 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:32,670 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 [2022-12-14 16:24:32,709 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 [2022-12-14 16:24:32,745 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:32,777 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:32,798 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:32,837 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:32,889 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:24:32,889 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 [2022-12-14 16:24:33,198 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:24:35,180 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '50422#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:24:35,180 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:24:35,180 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:24:35,180 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 14] total 30 [2022-12-14 16:24:35,180 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418283389] [2022-12-14 16:24:35,180 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:24:35,181 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-12-14 16:24:35,181 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:24:35,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-12-14 16:24:35,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=1932, Unknown=0, NotChecked=0, Total=2162 [2022-12-14 16:24:35,181 INFO L87 Difference]: Start difference. First operand 2336 states and 2731 transitions. Second operand has 32 states, 31 states have (on average 4.419354838709677) internal successors, (137), 31 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:24:35,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:24:35,712 INFO L93 Difference]: Finished difference Result 3129 states and 3647 transitions. [2022-12-14 16:24:35,712 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 16:24:35,712 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 4.419354838709677) internal successors, (137), 31 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2022-12-14 16:24:35,712 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:24:35,716 INFO L225 Difference]: With dead ends: 3129 [2022-12-14 16:24:35,716 INFO L226 Difference]: Without dead ends: 3129 [2022-12-14 16:24:35,716 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 149 SyntacticMatches, 6 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1058 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=493, Invalid=3047, Unknown=0, NotChecked=0, Total=3540 [2022-12-14 16:24:35,716 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 293 mSDsluCounter, 378 mSDsCounter, 0 mSdLazyCounter, 1032 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 293 SdHoareTripleChecker+Valid, 413 SdHoareTripleChecker+Invalid, 1034 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 1032 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 16:24:35,717 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [293 Valid, 413 Invalid, 1034 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 1032 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 16:24:35,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3129 states. [2022-12-14 16:24:35,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3129 to 2562. [2022-12-14 16:24:35,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2562 states, 2560 states have (on average 1.169921875) internal successors, (2995), 2561 states have internal predecessors, (2995), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:24:35,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2562 states to 2562 states and 2995 transitions. [2022-12-14 16:24:35,739 INFO L78 Accepts]: Start accepts. Automaton has 2562 states and 2995 transitions. Word has length 63 [2022-12-14 16:24:35,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:24:35,739 INFO L495 AbstractCegarLoop]: Abstraction has 2562 states and 2995 transitions. [2022-12-14 16:24:35,740 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 4.419354838709677) internal successors, (137), 31 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:24:35,740 INFO L276 IsEmpty]: Start isEmpty. Operand 2562 states and 2995 transitions. [2022-12-14 16:24:35,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2022-12-14 16:24:35,741 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:24:35,741 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:24:35,746 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-12-14 16:24:35,941 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:24:35,941 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:24:35,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:24:35,942 INFO L85 PathProgramCache]: Analyzing trace with hash -453623175, now seen corresponding path program 17 times [2022-12-14 16:24:35,942 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:24:35,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1151103342] [2022-12-14 16:24:35,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:24:35,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:24:35,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:24:36,486 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 49 proven. 185 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:36,486 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:24:36,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1151103342] [2022-12-14 16:24:36,486 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1151103342] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:24:36,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [430151055] [2022-12-14 16:24:36,486 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 16:24:36,486 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:24:36,486 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:24:36,487 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:24:36,488 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-12-14 16:24:36,739 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2022-12-14 16:24:36,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:24:36,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 418 conjuncts, 52 conjunts are in the unsatisfiable core [2022-12-14 16:24:36,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:24:37,187 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 64 proven. 170 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:37,188 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:24:37,664 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 [2022-12-14 16:24:37,847 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 64 proven. 170 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:37,847 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [430151055] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:24:37,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [448137136] [2022-12-14 16:24:37,848 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:24:37,848 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:24:37,849 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:24:37,849 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:24:37,849 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:24:37,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:24:37,870 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 [2022-12-14 16:24:37,893 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:37,920 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 [2022-12-14 16:24:37,940 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 [2022-12-14 16:24:37,973 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:38,008 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 [2022-12-14 16:24:38,037 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 [2022-12-14 16:24:38,057 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:38,098 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:38,131 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:24:38,131 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 [2022-12-14 16:24:38,270 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:24:40,948 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '56596#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:24:40,948 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:24:40,948 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:24:40,948 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 23] total 57 [2022-12-14 16:24:40,948 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407258932] [2022-12-14 16:24:40,948 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:24:40,948 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-12-14 16:24:40,948 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:24:40,949 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-12-14 16:24:40,949 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=570, Invalid=4542, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 16:24:40,949 INFO L87 Difference]: Start difference. First operand 2562 states and 2995 transitions. Second operand has 58 states, 57 states have (on average 3.0) internal successors, (171), 58 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:24:42,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:24:42,665 INFO L93 Difference]: Finished difference Result 3145 states and 3594 transitions. [2022-12-14 16:24:42,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-12-14 16:24:42,665 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 57 states have (on average 3.0) internal successors, (171), 58 states have internal predecessors, (171), 0 states have call successors, (0), 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 65 [2022-12-14 16:24:42,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:24:42,669 INFO L225 Difference]: With dead ends: 3145 [2022-12-14 16:24:42,669 INFO L226 Difference]: Without dead ends: 3145 [2022-12-14 16:24:42,670 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 236 GetRequests, 135 SyntacticMatches, 10 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3101 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=1291, Invalid=7265, Unknown=0, NotChecked=0, Total=8556 [2022-12-14 16:24:42,670 INFO L413 NwaCegarLoop]: 39 mSDtfsCounter, 773 mSDsluCounter, 465 mSDsCounter, 0 mSdLazyCounter, 2532 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 773 SdHoareTripleChecker+Valid, 504 SdHoareTripleChecker+Invalid, 2534 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 2532 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 16:24:42,670 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [773 Valid, 504 Invalid, 2534 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 2532 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 16:24:42,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3145 states. [2022-12-14 16:24:42,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3145 to 2614. [2022-12-14 16:24:42,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2614 states, 2612 states have (on average 1.1711332312404288) internal successors, (3059), 2613 states have internal predecessors, (3059), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:24:42,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2614 states to 2614 states and 3059 transitions. [2022-12-14 16:24:42,689 INFO L78 Accepts]: Start accepts. Automaton has 2614 states and 3059 transitions. Word has length 65 [2022-12-14 16:24:42,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:24:42,690 INFO L495 AbstractCegarLoop]: Abstraction has 2614 states and 3059 transitions. [2022-12-14 16:24:42,690 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 57 states have (on average 3.0) internal successors, (171), 58 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:24:42,690 INFO L276 IsEmpty]: Start isEmpty. Operand 2614 states and 3059 transitions. [2022-12-14 16:24:42,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2022-12-14 16:24:42,691 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:24:42,691 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:24:42,696 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Ended with exit code 0 [2022-12-14 16:24:42,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-12-14 16:24:42,892 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:24:42,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:24:42,892 INFO L85 PathProgramCache]: Analyzing trace with hash 1667864989, now seen corresponding path program 2 times [2022-12-14 16:24:42,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:24:42,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1581890381] [2022-12-14 16:24:42,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:24:42,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:24:42,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:24:43,382 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 5 proven. 125 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-12-14 16:24:43,383 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:24:43,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1581890381] [2022-12-14 16:24:43,383 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1581890381] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:24:43,383 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2002327244] [2022-12-14 16:24:43,383 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 16:24:43,383 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:24:43,383 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:24:43,384 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:24:43,385 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-12-14 16:24:43,789 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 16:24:43,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:24:43,792 INFO L263 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 64 conjunts are in the unsatisfiable core [2022-12-14 16:24:43,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:24:43,798 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 [2022-12-14 16:24:43,913 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 [2022-12-14 16:24:43,945 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 [2022-12-14 16:24:44,180 INFO L321 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2022-12-14 16:24:44,180 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 30 treesize of output 23 [2022-12-14 16:24:44,199 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 8 proven. 122 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-12-14 16:24:44,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:24:44,384 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 16:24:44,384 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 24 [2022-12-14 16:24:44,388 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 16:24:44,388 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 32 [2022-12-14 16:24:44,514 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 5 proven. 125 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-12-14 16:24:44,514 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2002327244] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:24:44,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1715298887] [2022-12-14 16:24:44,515 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 16:24:44,515 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:24:44,515 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:24:44,515 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:24:44,515 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:24:44,533 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:24:44,536 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 [2022-12-14 16:24:44,559 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 11 treesize of output 7 [2022-12-14 16:24:44,582 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:44,614 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:44,639 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:24:44,682 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:24:44,682 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 90 treesize of output 89 [2022-12-14 16:24:44,719 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 [2022-12-14 16:24:44,737 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 [2022-12-14 16:24:44,810 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:24:44,810 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 [2022-12-14 16:24:44,940 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:24:44,940 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 [2022-12-14 16:24:46,408 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:24:48,873 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62844#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:24:48,873 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:24:48,873 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:24:48,873 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 36 [2022-12-14 16:24:48,873 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857449230] [2022-12-14 16:24:48,873 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:24:48,874 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-12-14 16:24:48,874 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:24:48,874 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-12-14 16:24:48,874 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=2467, Unknown=7, NotChecked=0, Total=2652 [2022-12-14 16:24:48,874 INFO L87 Difference]: Start difference. First operand 2614 states and 3059 transitions. Second operand has 37 states, 37 states have (on average 3.2432432432432434) 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) [2022-12-14 16:24:49,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:24:49,735 INFO L93 Difference]: Finished difference Result 2906 states and 3350 transitions. [2022-12-14 16:24:49,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 16:24:49,736 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.2432432432432434) 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 67 [2022-12-14 16:24:49,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:24:49,738 INFO L225 Difference]: With dead ends: 2906 [2022-12-14 16:24:49,738 INFO L226 Difference]: Without dead ends: 2031 [2022-12-14 16:24:49,739 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 163 SyntacticMatches, 4 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 959 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=358, Invalid=3925, Unknown=7, NotChecked=0, Total=4290 [2022-12-14 16:24:49,739 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 334 mSDsluCounter, 696 mSDsCounter, 0 mSdLazyCounter, 1395 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 334 SdHoareTripleChecker+Valid, 742 SdHoareTripleChecker+Invalid, 1402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 1395 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 16:24:49,739 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [334 Valid, 742 Invalid, 1402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 1395 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 16:24:49,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2031 states. [2022-12-14 16:24:49,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2031 to 1752. [2022-12-14 16:24:49,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1752 states, 1750 states have (on average 1.1748571428571428) internal successors, (2056), 1751 states have internal predecessors, (2056), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:24:49,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1752 states to 1752 states and 2056 transitions. [2022-12-14 16:24:49,752 INFO L78 Accepts]: Start accepts. Automaton has 1752 states and 2056 transitions. Word has length 67 [2022-12-14 16:24:49,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:24:49,753 INFO L495 AbstractCegarLoop]: Abstraction has 1752 states and 2056 transitions. [2022-12-14 16:24:49,753 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 3.2432432432432434) 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) [2022-12-14 16:24:49,753 INFO L276 IsEmpty]: Start isEmpty. Operand 1752 states and 2056 transitions. [2022-12-14 16:24:49,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2022-12-14 16:24:49,753 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:24:49,754 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:24:49,758 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-12-14 16:24:49,954 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-12-14 16:24:49,955 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:24:49,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:24:49,956 INFO L85 PathProgramCache]: Analyzing trace with hash 624161792, now seen corresponding path program 18 times [2022-12-14 16:24:49,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:24:49,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608617480] [2022-12-14 16:24:49,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:24:49,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:24:50,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:24:50,653 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 28 proven. 243 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:50,653 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:24:50,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608617480] [2022-12-14 16:24:50,653 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [608617480] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:24:50,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1487948421] [2022-12-14 16:24:50,654 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 16:24:50,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:24:50,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:24:50,654 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:24:50,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-12-14 16:24:50,787 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 16:24:50,787 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:24:50,790 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 77 conjunts are in the unsatisfiable core [2022-12-14 16:24:50,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:24:50,951 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:51,086 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 28 proven. 243 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:51,086 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:24:51,153 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 [2022-12-14 16:24:51,154 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 [2022-12-14 16:24:51,245 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 28 proven. 243 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:51,245 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1487948421] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:24:51,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2032324019] [2022-12-14 16:24:51,246 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:24:51,246 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:24:51,246 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:24:51,246 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:24:51,246 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:24:51,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:24:51,264 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 [2022-12-14 16:24:51,286 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:24:51,312 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:51,333 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:51,363 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 [2022-12-14 16:24:51,391 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 [2022-12-14 16:24:51,427 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 [2022-12-14 16:24:51,457 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 [2022-12-14 16:24:51,483 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 [2022-12-14 16:24:51,520 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:24:51,520 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 [2022-12-14 16:24:51,652 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:24:54,154 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '67998#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:24:54,154 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:24:54,154 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:24:54,154 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 45 [2022-12-14 16:24:54,155 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836431590] [2022-12-14 16:24:54,155 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:24:54,155 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-12-14 16:24:54,155 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:24:54,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-12-14 16:24:54,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=3208, Unknown=0, NotChecked=0, Total=3422 [2022-12-14 16:24:54,156 INFO L87 Difference]: Start difference. First operand 1752 states and 2056 transitions. Second operand has 45 states, 45 states have (on average 2.488888888888889) internal successors, (112), 45 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) [2022-12-14 16:24:56,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:24:56,293 INFO L93 Difference]: Finished difference Result 2584 states and 2964 transitions. [2022-12-14 16:24:56,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-12-14 16:24:56,294 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.488888888888889) internal successors, (112), 45 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 69 [2022-12-14 16:24:56,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:24:56,298 INFO L225 Difference]: With dead ends: 2584 [2022-12-14 16:24:56,298 INFO L226 Difference]: Without dead ends: 2217 [2022-12-14 16:24:56,298 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 171 SyntacticMatches, 3 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 1524 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=493, Invalid=6149, Unknown=0, NotChecked=0, Total=6642 [2022-12-14 16:24:56,299 INFO L413 NwaCegarLoop]: 93 mSDtfsCounter, 680 mSDsluCounter, 2107 mSDsCounter, 0 mSdLazyCounter, 4450 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 680 SdHoareTripleChecker+Valid, 2200 SdHoareTripleChecker+Invalid, 4459 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 4450 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-12-14 16:24:56,299 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [680 Valid, 2200 Invalid, 4459 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 4450 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-12-14 16:24:56,300 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2217 states. [2022-12-14 16:24:56,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2217 to 2011. [2022-12-14 16:24:56,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2011 states, 2009 states have (on average 1.1772025883524142) internal successors, (2365), 2010 states have internal predecessors, (2365), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:24:56,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2011 states to 2011 states and 2365 transitions. [2022-12-14 16:24:56,320 INFO L78 Accepts]: Start accepts. Automaton has 2011 states and 2365 transitions. Word has length 69 [2022-12-14 16:24:56,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:24:56,320 INFO L495 AbstractCegarLoop]: Abstraction has 2011 states and 2365 transitions. [2022-12-14 16:24:56,321 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.488888888888889) internal successors, (112), 45 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) [2022-12-14 16:24:56,321 INFO L276 IsEmpty]: Start isEmpty. Operand 2011 states and 2365 transitions. [2022-12-14 16:24:56,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2022-12-14 16:24:56,322 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:24:56,322 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:24:56,327 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2022-12-14 16:24:56,522 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:24:56,523 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:24:56,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:24:56,523 INFO L85 PathProgramCache]: Analyzing trace with hash 427949454, now seen corresponding path program 19 times [2022-12-14 16:24:56,523 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:24:56,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2128958443] [2022-12-14 16:24:56,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:24:56,523 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:24:56,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:24:57,260 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 64 proven. 226 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:57,260 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:24:57,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2128958443] [2022-12-14 16:24:57,261 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2128958443] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:24:57,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [891164319] [2022-12-14 16:24:57,261 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 16:24:57,261 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:24:57,261 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:24:57,262 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:24:57,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-12-14 16:24:57,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:24:57,371 INFO L263 TraceCheckSpWp]: Trace formula consists of 451 conjuncts, 65 conjunts are in the unsatisfiable core [2022-12-14 16:24:57,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:24:57,751 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 81 proven. 209 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:57,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:24:58,243 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 [2022-12-14 16:24:58,448 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 81 proven. 209 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:24:58,448 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [891164319] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:24:58,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1982066056] [2022-12-14 16:24:58,449 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:24:58,450 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:24:58,450 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:24:58,450 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:24:58,450 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:24:58,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:24:58,471 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 [2022-12-14 16:24:58,494 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 11 treesize of output 7 [2022-12-14 16:24:58,526 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:58,552 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:58,585 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 11 treesize of output 7 [2022-12-14 16:24:58,627 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:24:58,627 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 [2022-12-14 16:24:58,664 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 [2022-12-14 16:24:58,688 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:24:58,760 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:24:58,761 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 [2022-12-14 16:24:58,911 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:24:58,912 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 [2022-12-14 16:24:59,771 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:25:04,034 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '73126#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:25:04,034 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:25:04,034 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:25:04,035 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 25, 25] total 52 [2022-12-14 16:25:04,035 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351098592] [2022-12-14 16:25:04,035 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:25:04,035 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-12-14 16:25:04,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:25:04,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-12-14 16:25:04,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=416, Invalid=4006, Unknown=0, NotChecked=0, Total=4422 [2022-12-14 16:25:04,036 INFO L87 Difference]: Start difference. First operand 2011 states and 2365 transitions. Second operand has 53 states, 52 states have (on average 2.8846153846153846) internal successors, (150), 53 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) [2022-12-14 16:25:06,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:25:06,259 INFO L93 Difference]: Finished difference Result 2543 states and 2908 transitions. [2022-12-14 16:25:06,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-12-14 16:25:06,260 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 52 states have (on average 2.8846153846153846) internal successors, (150), 53 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) Word has length 71 [2022-12-14 16:25:06,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:25:06,262 INFO L225 Difference]: With dead ends: 2543 [2022-12-14 16:25:06,262 INFO L226 Difference]: Without dead ends: 2543 [2022-12-14 16:25:06,262 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 258 GetRequests, 159 SyntacticMatches, 11 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2612 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=1187, Invalid=6823, Unknown=0, NotChecked=0, Total=8010 [2022-12-14 16:25:06,263 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 791 mSDsluCounter, 839 mSDsCounter, 0 mSdLazyCounter, 4554 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 791 SdHoareTripleChecker+Valid, 884 SdHoareTripleChecker+Invalid, 4555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 4554 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-12-14 16:25:06,263 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [791 Valid, 884 Invalid, 4555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 4554 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-12-14 16:25:06,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2543 states. [2022-12-14 16:25:06,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2543 to 2055. [2022-12-14 16:25:06,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2055 states, 2053 states have (on average 1.178275694106186) internal successors, (2419), 2054 states have internal predecessors, (2419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:25:06,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2055 states to 2055 states and 2419 transitions. [2022-12-14 16:25:06,287 INFO L78 Accepts]: Start accepts. Automaton has 2055 states and 2419 transitions. Word has length 71 [2022-12-14 16:25:06,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:25:06,287 INFO L495 AbstractCegarLoop]: Abstraction has 2055 states and 2419 transitions. [2022-12-14 16:25:06,287 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 52 states have (on average 2.8846153846153846) internal successors, (150), 53 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) [2022-12-14 16:25:06,287 INFO L276 IsEmpty]: Start isEmpty. Operand 2055 states and 2419 transitions. [2022-12-14 16:25:06,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-12-14 16:25:06,289 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:25:06,289 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:25:06,293 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-12-14 16:25:06,489 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-12-14 16:25:06,490 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:25:06,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:25:06,490 INFO L85 PathProgramCache]: Analyzing trace with hash 670563883, now seen corresponding path program 10 times [2022-12-14 16:25:06,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:25:06,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136177886] [2022-12-14 16:25:06,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:25:06,491 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:25:06,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:25:07,281 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 6 proven. 160 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:07,282 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:25:07,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136177886] [2022-12-14 16:25:07,282 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1136177886] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:25:07,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1057986332] [2022-12-14 16:25:07,282 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 16:25:07,282 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:25:07,282 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:25:07,283 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:25:07,283 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-12-14 16:25:07,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:25:07,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 439 conjuncts, 56 conjunts are in the unsatisfiable core [2022-12-14 16:25:07,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:25:07,571 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 [2022-12-14 16:25:07,614 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:25:07,614 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 [2022-12-14 16:25:07,998 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-12-14 16:25:07,998 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 18 treesize of output 10 [2022-12-14 16:25:08,024 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 41 proven. 125 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:08,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:25:08,334 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 38 [2022-12-14 16:25:08,447 INFO L134 CoverageAnalysis]: Checked inductivity of 167 backedges. 41 proven. 125 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:08,447 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1057986332] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:25:08,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2089448782] [2022-12-14 16:25:08,448 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 16:25:08,448 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:25:08,448 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:25:08,449 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:25:08,449 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:25:08,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:25:08,464 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 [2022-12-14 16:25:08,502 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 [2022-12-14 16:25:08,540 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:08,560 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 14 treesize of output 10 [2022-12-14 16:25:08,620 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 11 treesize of output 7 [2022-12-14 16:25:08,653 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:08,675 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:08,718 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 [2022-12-14 16:25:08,754 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:25:08,754 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 [2022-12-14 16:25:09,037 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:25:12,690 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '78259#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:25:12,690 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:25:12,690 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:25:12,691 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 17, 17] total 48 [2022-12-14 16:25:12,691 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1143484623] [2022-12-14 16:25:12,691 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:25:12,691 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-12-14 16:25:12,691 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:25:12,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-12-14 16:25:12,691 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=3816, Unknown=0, NotChecked=0, Total=4032 [2022-12-14 16:25:12,692 INFO L87 Difference]: Start difference. First operand 2055 states and 2419 transitions. Second operand has 49 states, 49 states have (on average 3.9591836734693877) internal successors, (194), 48 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:25:14,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:25:14,815 INFO L93 Difference]: Finished difference Result 4901 states and 5715 transitions. [2022-12-14 16:25:14,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-12-14 16:25:14,815 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.9591836734693877) internal successors, (194), 48 states have internal predecessors, (194), 0 states have call successors, (0), 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 [2022-12-14 16:25:14,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:25:14,818 INFO L225 Difference]: With dead ends: 4901 [2022-12-14 16:25:14,818 INFO L226 Difference]: Without dead ends: 2836 [2022-12-14 16:25:14,818 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 167 SyntacticMatches, 8 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 7 DeprecatedPredicates, 1773 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=557, Invalid=7099, Unknown=0, NotChecked=0, Total=7656 [2022-12-14 16:25:14,819 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 669 mSDsluCounter, 1237 mSDsCounter, 0 mSdLazyCounter, 2938 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 669 SdHoareTripleChecker+Valid, 1288 SdHoareTripleChecker+Invalid, 2945 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 2938 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-12-14 16:25:14,819 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [669 Valid, 1288 Invalid, 2945 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 2938 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-12-14 16:25:14,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2836 states. [2022-12-14 16:25:14,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2836 to 2057. [2022-12-14 16:25:14,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2057 states, 2055 states have (on average 1.1785888077858881) internal successors, (2422), 2056 states have internal predecessors, (2422), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:25:14,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2057 states to 2057 states and 2422 transitions. [2022-12-14 16:25:14,836 INFO L78 Accepts]: Start accepts. Automaton has 2057 states and 2422 transitions. Word has length 72 [2022-12-14 16:25:14,836 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:25:14,836 INFO L495 AbstractCegarLoop]: Abstraction has 2057 states and 2422 transitions. [2022-12-14 16:25:14,836 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 3.9591836734693877) internal successors, (194), 48 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:25:14,836 INFO L276 IsEmpty]: Start isEmpty. Operand 2057 states and 2422 transitions. [2022-12-14 16:25:14,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2022-12-14 16:25:14,837 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:25:14,837 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:25:14,842 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2022-12-14 16:25:15,037 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-12-14 16:25:15,038 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:25:15,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:25:15,039 INFO L85 PathProgramCache]: Analyzing trace with hash -1966363231, now seen corresponding path program 11 times [2022-12-14 16:25:15,039 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:25:15,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1305500171] [2022-12-14 16:25:15,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:25:15,039 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:25:15,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:25:15,404 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 16 proven. 161 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:15,404 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:25:15,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1305500171] [2022-12-14 16:25:15,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1305500171] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:25:15,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [17060930] [2022-12-14 16:25:15,405 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 16:25:15,405 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:25:15,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:25:15,406 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:25:15,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-12-14 16:25:15,564 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 16:25:15,564 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:25:15,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 452 conjuncts, 40 conjunts are in the unsatisfiable core [2022-12-14 16:25:15,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:25:15,833 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 25 proven. 152 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:15,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:25:16,067 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 [2022-12-14 16:25:16,129 INFO L134 CoverageAnalysis]: Checked inductivity of 178 backedges. 25 proven. 152 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:16,129 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [17060930] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:25:16,129 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1097804855] [2022-12-14 16:25:16,130 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 16:25:16,130 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:25:16,130 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:25:16,130 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:25:16,130 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:25:16,147 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:25:16,148 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 [2022-12-14 16:25:16,169 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-12-14 16:25:16,199 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:16,222 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 14 treesize of output 10 [2022-12-14 16:25:16,247 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:25:16,283 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:25:16,283 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 [2022-12-14 16:25:16,322 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:16,335 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:16,409 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:25:16,410 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 [2022-12-14 16:25:16,525 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:25:16,525 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 [2022-12-14 16:25:17,775 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:25:20,400 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '85760#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:25:20,400 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:25:20,400 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:25:20,400 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 16, 16] total 40 [2022-12-14 16:25:20,400 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331555051] [2022-12-14 16:25:20,400 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:25:20,401 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-12-14 16:25:20,401 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:25:20,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-12-14 16:25:20,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=2847, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 16:25:20,401 INFO L87 Difference]: Start difference. First operand 2057 states and 2422 transitions. Second operand has 42 states, 41 states have (on average 5.0) internal successors, (205), 41 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:25:21,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:25:21,043 INFO L93 Difference]: Finished difference Result 3174 states and 3712 transitions. [2022-12-14 16:25:21,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 16:25:21,043 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 5.0) internal successors, (205), 41 states have internal predecessors, (205), 0 states have call successors, (0), 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 [2022-12-14 16:25:21,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:25:21,046 INFO L225 Difference]: With dead ends: 3174 [2022-12-14 16:25:21,046 INFO L226 Difference]: Without dead ends: 3174 [2022-12-14 16:25:21,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 173 SyntacticMatches, 7 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1703 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=721, Invalid=4391, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 16:25:21,047 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 810 mSDsluCounter, 389 mSDsCounter, 0 mSdLazyCounter, 1044 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 810 SdHoareTripleChecker+Valid, 423 SdHoareTripleChecker+Invalid, 1045 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1044 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 16:25:21,047 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [810 Valid, 423 Invalid, 1045 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1044 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 16:25:21,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3174 states. [2022-12-14 16:25:21,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3174 to 2332. [2022-12-14 16:25:21,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2332 states, 2330 states have (on average 1.1781115879828326) internal successors, (2745), 2331 states have internal predecessors, (2745), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:25:21,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2332 states to 2332 states and 2745 transitions. [2022-12-14 16:25:21,065 INFO L78 Accepts]: Start accepts. Automaton has 2332 states and 2745 transitions. Word has length 74 [2022-12-14 16:25:21,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:25:21,065 INFO L495 AbstractCegarLoop]: Abstraction has 2332 states and 2745 transitions. [2022-12-14 16:25:21,065 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 41 states have (on average 5.0) internal successors, (205), 41 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:25:21,065 INFO L276 IsEmpty]: Start isEmpty. Operand 2332 states and 2745 transitions. [2022-12-14 16:25:21,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-12-14 16:25:21,066 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:25:21,066 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:25:21,071 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2022-12-14 16:25:21,267 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:25:21,267 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:25:21,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:25:21,268 INFO L85 PathProgramCache]: Analyzing trace with hash 1754406037, now seen corresponding path program 20 times [2022-12-14 16:25:21,269 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:25:21,269 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1154468012] [2022-12-14 16:25:21,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:25:21,269 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:25:21,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:25:22,007 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 31 proven. 300 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:22,007 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:25:22,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1154468012] [2022-12-14 16:25:22,007 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1154468012] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:25:22,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1397555538] [2022-12-14 16:25:22,007 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 16:25:22,007 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:25:22,007 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:25:22,008 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:25:22,009 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-12-14 16:25:22,557 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2022-12-14 16:25:22,557 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:25:22,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 89 conjunts are in the unsatisfiable core [2022-12-14 16:25:22,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:25:22,666 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 13 treesize of output 9 [2022-12-14 16:25:22,906 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 31 proven. 300 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:22,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:25:22,982 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 [2022-12-14 16:25:22,983 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 [2022-12-14 16:25:23,282 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 31 proven. 300 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:23,282 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1397555538] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:25:23,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1591086534] [2022-12-14 16:25:23,283 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:25:23,284 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:25:23,284 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:25:23,284 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:25:23,284 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:25:23,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:25:23,307 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 [2022-12-14 16:25:23,329 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:25:23,359 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:23,378 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 [2022-12-14 16:25:23,413 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 [2022-12-14 16:25:23,441 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 [2022-12-14 16:25:23,473 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:23,495 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:23,522 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 [2022-12-14 16:25:23,548 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:25:23,548 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 [2022-12-14 16:25:23,682 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:25:26,161 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '91810#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:25:26,161 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:25:26,161 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:25:26,162 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 55 [2022-12-14 16:25:26,162 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874684678] [2022-12-14 16:25:26,162 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:25:26,162 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-12-14 16:25:26,162 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:25:26,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-12-14 16:25:26,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=240, Invalid=4452, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 16:25:26,163 INFO L87 Difference]: Start difference. First operand 2332 states and 2745 transitions. Second operand has 55 states, 55 states have (on average 2.709090909090909) internal successors, (149), 55 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:25:28,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:25:28,950 INFO L93 Difference]: Finished difference Result 3332 states and 3839 transitions. [2022-12-14 16:25:28,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-12-14 16:25:28,951 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 2.709090909090909) internal successors, (149), 55 states have internal predecessors, (149), 0 states have call successors, (0), 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 75 [2022-12-14 16:25:28,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:25:28,953 INFO L225 Difference]: With dead ends: 3332 [2022-12-14 16:25:28,953 INFO L226 Difference]: Without dead ends: 2927 [2022-12-14 16:25:28,954 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 182 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2097 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=514, Invalid=8042, Unknown=0, NotChecked=0, Total=8556 [2022-12-14 16:25:28,954 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 714 mSDsluCounter, 2699 mSDsCounter, 0 mSdLazyCounter, 6317 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 714 SdHoareTripleChecker+Valid, 2803 SdHoareTripleChecker+Invalid, 6327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 6317 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-12-14 16:25:28,954 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [714 Valid, 2803 Invalid, 6327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 6317 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-12-14 16:25:28,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2927 states. [2022-12-14 16:25:28,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2927 to 2660. [2022-12-14 16:25:28,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2660 states, 2658 states have (on average 1.18058690744921) internal successors, (3138), 2659 states have internal predecessors, (3138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:25:28,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2660 states to 2660 states and 3138 transitions. [2022-12-14 16:25:28,971 INFO L78 Accepts]: Start accepts. Automaton has 2660 states and 3138 transitions. Word has length 75 [2022-12-14 16:25:28,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:25:28,971 INFO L495 AbstractCegarLoop]: Abstraction has 2660 states and 3138 transitions. [2022-12-14 16:25:28,971 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 2.709090909090909) internal successors, (149), 55 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:25:28,971 INFO L276 IsEmpty]: Start isEmpty. Operand 2660 states and 3138 transitions. [2022-12-14 16:25:28,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2022-12-14 16:25:28,972 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:25:28,973 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:25:28,978 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-12-14 16:25:29,173 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-12-14 16:25:29,174 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:25:29,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:25:29,175 INFO L85 PathProgramCache]: Analyzing trace with hash -634764381, now seen corresponding path program 21 times [2022-12-14 16:25:29,175 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:25:29,175 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996895121] [2022-12-14 16:25:29,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:25:29,176 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:25:29,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:25:29,829 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 81 proven. 271 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:29,829 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:25:29,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996895121] [2022-12-14 16:25:29,829 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1996895121] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:25:29,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [250863675] [2022-12-14 16:25:29,829 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 16:25:29,829 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:25:29,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:25:29,830 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:25:29,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-12-14 16:25:30,023 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 16:25:30,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:25:30,027 INFO L263 TraceCheckSpWp]: Trace formula consists of 484 conjuncts, 71 conjunts are in the unsatisfiable core [2022-12-14 16:25:30,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:25:30,037 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 16:25:30,037 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 [2022-12-14 16:25:30,352 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 100 proven. 252 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:30,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:25:31,018 INFO L134 CoverageAnalysis]: Checked inductivity of 353 backedges. 100 proven. 252 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:31,018 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [250863675] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:25:31,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [319494972] [2022-12-14 16:25:31,019 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:25:31,019 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:25:31,019 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:25:31,019 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:25:31,019 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:25:31,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:25:31,034 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 [2022-12-14 16:25:31,057 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:31,086 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 [2022-12-14 16:25:31,103 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 [2022-12-14 16:25:31,140 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-12-14 16:25:31,166 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:31,183 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:31,209 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 [2022-12-14 16:25:31,240 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:25:31,241 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 [2022-12-14 16:25:31,403 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:25:34,048 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '98389#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:25:34,048 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:25:34,049 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:25:34,049 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 27, 27] total 68 [2022-12-14 16:25:34,049 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900926864] [2022-12-14 16:25:34,049 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:25:34,049 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-12-14 16:25:34,049 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:25:34,050 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-12-14 16:25:34,050 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=713, Invalid=6093, Unknown=0, NotChecked=0, Total=6806 [2022-12-14 16:25:34,050 INFO L87 Difference]: Start difference. First operand 2660 states and 3138 transitions. Second operand has 69 states, 68 states have (on average 2.75) internal successors, (187), 69 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) [2022-12-14 16:25:36,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:25:36,024 INFO L93 Difference]: Finished difference Result 3288 states and 3778 transitions. [2022-12-14 16:25:36,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-12-14 16:25:36,024 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 68 states have (on average 2.75) internal successors, (187), 69 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 77 [2022-12-14 16:25:36,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:25:36,027 INFO L225 Difference]: With dead ends: 3288 [2022-12-14 16:25:36,027 INFO L226 Difference]: Without dead ends: 3288 [2022-12-14 16:25:36,027 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 174 SyntacticMatches, 0 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3267 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=1858, Invalid=9698, Unknown=0, NotChecked=0, Total=11556 [2022-12-14 16:25:36,027 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 931 mSDsluCounter, 1016 mSDsCounter, 0 mSdLazyCounter, 4838 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 931 SdHoareTripleChecker+Valid, 1074 SdHoareTripleChecker+Invalid, 4839 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 4838 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-12-14 16:25:36,027 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [931 Valid, 1074 Invalid, 4839 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 4838 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-12-14 16:25:36,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3288 states. [2022-12-14 16:25:36,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3288 to 2708. [2022-12-14 16:25:36,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2708 states, 2706 states have (on average 1.1814486326681448) internal successors, (3197), 2707 states have internal predecessors, (3197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:25:36,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2708 states to 2708 states and 3197 transitions. [2022-12-14 16:25:36,048 INFO L78 Accepts]: Start accepts. Automaton has 2708 states and 3197 transitions. Word has length 77 [2022-12-14 16:25:36,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:25:36,048 INFO L495 AbstractCegarLoop]: Abstraction has 2708 states and 3197 transitions. [2022-12-14 16:25:36,048 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 68 states have (on average 2.75) internal successors, (187), 69 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) [2022-12-14 16:25:36,049 INFO L276 IsEmpty]: Start isEmpty. Operand 2708 states and 3197 transitions. [2022-12-14 16:25:36,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2022-12-14 16:25:36,050 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:25:36,050 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:25:36,055 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2022-12-14 16:25:36,250 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:25:36,250 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:25:36,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:25:36,251 INFO L85 PathProgramCache]: Analyzing trace with hash 1892634666, now seen corresponding path program 22 times [2022-12-14 16:25:36,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:25:36,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940194541] [2022-12-14 16:25:36,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:25:36,251 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:25:36,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:25:37,035 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 34 proven. 363 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:37,035 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:25:37,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940194541] [2022-12-14 16:25:37,035 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [940194541] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:25:37,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [791463640] [2022-12-14 16:25:37,035 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 16:25:37,036 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:25:37,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:25:37,036 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:25:37,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-12-14 16:25:37,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:25:37,181 INFO L263 TraceCheckSpWp]: Trace formula consists of 504 conjuncts, 91 conjunts are in the unsatisfiable core [2022-12-14 16:25:37,183 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:25:37,474 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 [2022-12-14 16:25:37,625 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 34 proven. 363 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:37,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:25:37,711 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 [2022-12-14 16:25:37,712 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 [2022-12-14 16:25:37,831 INFO L134 CoverageAnalysis]: Checked inductivity of 398 backedges. 34 proven. 363 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:37,831 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [791463640] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:25:37,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [765230277] [2022-12-14 16:25:37,831 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:25:37,832 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:25:37,832 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:25:37,832 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:25:37,832 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:25:37,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:25:37,851 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 [2022-12-14 16:25:37,871 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:37,895 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:37,911 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:37,952 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 14 treesize of output 10 [2022-12-14 16:25:37,982 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:38,005 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:38,022 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:38,053 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:38,099 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:25:38,099 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 [2022-12-14 16:25:38,226 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:25:40,735 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '104980#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:25:40,735 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:25:40,735 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:25:40,735 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 51 [2022-12-14 16:25:40,735 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204630344] [2022-12-14 16:25:40,735 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:25:40,735 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-12-14 16:25:40,736 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:25:40,736 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-12-14 16:25:40,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=3930, Unknown=0, NotChecked=0, Total=4160 [2022-12-14 16:25:40,736 INFO L87 Difference]: Start difference. First operand 2708 states and 3197 transitions. Second operand has 51 states, 51 states have (on average 2.5098039215686274) internal successors, (128), 51 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) [2022-12-14 16:25:43,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:25:43,470 INFO L93 Difference]: Finished difference Result 3801 states and 4394 transitions. [2022-12-14 16:25:43,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-12-14 16:25:43,470 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.5098039215686274) internal successors, (128), 51 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 81 [2022-12-14 16:25:43,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:25:43,473 INFO L225 Difference]: With dead ends: 3801 [2022-12-14 16:25:43,473 INFO L226 Difference]: Without dead ends: 3360 [2022-12-14 16:25:43,473 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 205 SyntacticMatches, 3 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 1871 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=555, Invalid=7817, Unknown=0, NotChecked=0, Total=8372 [2022-12-14 16:25:43,474 INFO L413 NwaCegarLoop]: 115 mSDtfsCounter, 774 mSDsluCounter, 2980 mSDsCounter, 0 mSdLazyCounter, 6272 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 774 SdHoareTripleChecker+Valid, 3095 SdHoareTripleChecker+Invalid, 6283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 6272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-12-14 16:25:43,474 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [774 Valid, 3095 Invalid, 6283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 6272 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-12-14 16:25:43,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3360 states. [2022-12-14 16:25:43,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3360 to 3064. [2022-12-14 16:25:43,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3064 states, 3062 states have (on average 1.1838667537557153) internal successors, (3625), 3063 states have internal predecessors, (3625), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:25:43,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3064 states to 3064 states and 3625 transitions. [2022-12-14 16:25:43,496 INFO L78 Accepts]: Start accepts. Automaton has 3064 states and 3625 transitions. Word has length 81 [2022-12-14 16:25:43,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:25:43,496 INFO L495 AbstractCegarLoop]: Abstraction has 3064 states and 3625 transitions. [2022-12-14 16:25:43,496 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.5098039215686274) internal successors, (128), 51 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) [2022-12-14 16:25:43,496 INFO L276 IsEmpty]: Start isEmpty. Operand 3064 states and 3625 transitions. [2022-12-14 16:25:43,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-12-14 16:25:43,497 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:25:43,497 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:25:43,503 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-12-14 16:25:43,698 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:25:43,698 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:25:43,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:25:43,698 INFO L85 PathProgramCache]: Analyzing trace with hash 1208317112, now seen corresponding path program 23 times [2022-12-14 16:25:43,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:25:43,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556173629] [2022-12-14 16:25:43,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:25:43,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:25:43,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:25:44,645 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 100 proven. 320 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:44,645 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:25:44,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556173629] [2022-12-14 16:25:44,646 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1556173629] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:25:44,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1777444953] [2022-12-14 16:25:44,646 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 16:25:44,646 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:25:44,646 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:25:44,647 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:25:44,647 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-12-14 16:25:45,051 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-12-14 16:25:45,051 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:25:45,054 INFO L263 TraceCheckSpWp]: Trace formula consists of 517 conjuncts, 65 conjunts are in the unsatisfiable core [2022-12-14 16:25:45,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:25:45,066 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-12-14 16:25:45,066 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 [2022-12-14 16:25:45,687 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 121 proven. 299 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:45,687 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:25:46,671 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 121 proven. 299 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:46,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1777444953] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:25:46,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1877867249] [2022-12-14 16:25:46,672 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-12-14 16:25:46,672 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:25:46,672 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:25:46,672 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:25:46,672 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:25:46,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:25:46,683 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 [2022-12-14 16:25:46,708 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 11 treesize of output 7 [2022-12-14 16:25:46,741 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:46,768 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:46,794 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:46,824 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 [2022-12-14 16:25:46,855 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:46,887 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:46,916 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:46,948 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:25:46,949 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 [2022-12-14 16:25:47,082 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:25:49,344 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '112491#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~s~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (< (select |#length| |ULTIMATE.start_cstrspn_~s~0#1.base|) (+ |ULTIMATE.start_cstrspn_~s~0#1.offset| 1)) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:25:49,344 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:25:49,344 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:25:49,345 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 29, 29] total 85 [2022-12-14 16:25:49,345 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903080941] [2022-12-14 16:25:49,345 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:25:49,345 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 86 states [2022-12-14 16:25:49,345 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:25:49,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 86 interpolants. [2022-12-14 16:25:49,346 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1126, Invalid=8774, Unknown=0, NotChecked=0, Total=9900 [2022-12-14 16:25:49,346 INFO L87 Difference]: Start difference. First operand 3064 states and 3625 transitions. Second operand has 86 states, 85 states have (on average 2.8941176470588235) internal successors, (246), 86 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:25:51,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:25:51,695 INFO L93 Difference]: Finished difference Result 3737 states and 4309 transitions. [2022-12-14 16:25:51,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-12-14 16:25:51,695 INFO L78 Accepts]: Start accepts. Automaton has has 86 states, 85 states have (on average 2.8941176470588235) internal successors, (246), 86 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 83 [2022-12-14 16:25:51,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:25:51,697 INFO L225 Difference]: With dead ends: 3737 [2022-12-14 16:25:51,697 INFO L226 Difference]: Without dead ends: 3737 [2022-12-14 16:25:51,698 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 177 SyntacticMatches, 0 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5182 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=2561, Invalid=13441, Unknown=0, NotChecked=0, Total=16002 [2022-12-14 16:25:51,698 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 961 mSDsluCounter, 699 mSDsCounter, 0 mSdLazyCounter, 3409 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 961 SdHoareTripleChecker+Valid, 752 SdHoareTripleChecker+Invalid, 3410 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3409 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-12-14 16:25:51,698 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [961 Valid, 752 Invalid, 3410 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3409 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-12-14 16:25:51,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3737 states. [2022-12-14 16:25:51,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3737 to 3112. [2022-12-14 16:25:51,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3112 states, 3110 states have (on average 1.184565916398714) internal successors, (3684), 3111 states have internal predecessors, (3684), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:25:51,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3112 states to 3112 states and 3684 transitions. [2022-12-14 16:25:51,730 INFO L78 Accepts]: Start accepts. Automaton has 3112 states and 3684 transitions. Word has length 83 [2022-12-14 16:25:51,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:25:51,731 INFO L495 AbstractCegarLoop]: Abstraction has 3112 states and 3684 transitions. [2022-12-14 16:25:51,731 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 86 states, 85 states have (on average 2.8941176470588235) internal successors, (246), 86 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:25:51,731 INFO L276 IsEmpty]: Start isEmpty. Operand 3112 states and 3684 transitions. [2022-12-14 16:25:51,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2022-12-14 16:25:51,732 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:25:51,732 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:25:51,737 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-12-14 16:25:51,932 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:25:51,933 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:25:51,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:25:51,933 INFO L85 PathProgramCache]: Analyzing trace with hash -1562204932, now seen corresponding path program 12 times [2022-12-14 16:25:51,933 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:25:51,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70990792] [2022-12-14 16:25:51,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:25:51,933 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:25:51,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:25:52,733 INFO L134 CoverageAnalysis]: Checked inductivity of 233 backedges. 7 proven. 225 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:52,733 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:25:52,733 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70990792] [2022-12-14 16:25:52,734 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [70990792] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:25:52,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [149207307] [2022-12-14 16:25:52,734 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 16:25:52,734 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:25:52,734 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:25:52,734 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:25:52,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-12-14 16:25:52,931 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 16:25:52,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:25:52,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 113 conjunts are in the unsatisfiable core [2022-12-14 16:25:52,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:25:53,199 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:53,253 INFO L321 Elim1Store]: treesize reduction 32, result has 23.8 percent of original size [2022-12-14 16:25:53,254 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 24 treesize of output 23 [2022-12-14 16:25:55,411 INFO L321 Elim1Store]: treesize reduction 102, result has 27.7 percent of original size [2022-12-14 16:25:55,411 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 70 treesize of output 61 [2022-12-14 16:25:55,455 INFO L134 CoverageAnalysis]: Checked inductivity of 233 backedges. 7 proven. 225 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:55,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:25:56,273 INFO L321 Elim1Store]: treesize reduction 55, result has 42.1 percent of original size [2022-12-14 16:25:56,273 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 512 treesize of output 399 [2022-12-14 16:25:56,287 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 16:25:56,287 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 357 treesize of output 331 [2022-12-14 16:25:56,300 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 370 treesize of output 346 [2022-12-14 16:25:56,413 INFO L173 IndexEqualityManager]: detected equality via solver [2022-12-14 16:25:56,448 INFO L321 Elim1Store]: treesize reduction 10, result has 82.5 percent of original size [2022-12-14 16:25:56,449 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 4 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 143 treesize of output 142 [2022-12-14 16:25:57,202 INFO L134 CoverageAnalysis]: Checked inductivity of 233 backedges. 34 proven. 198 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:25:57,203 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [149207307] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:25:57,203 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [654129376] [2022-12-14 16:25:57,204 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 16:25:57,204 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:25:57,204 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:25:57,204 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:25:57,204 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:25:57,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:25:57,227 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 [2022-12-14 16:25:57,249 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:25:57,276 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:57,300 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 [2022-12-14 16:25:57,330 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:25:57,372 INFO L321 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2022-12-14 16:25:57,372 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 [2022-12-14 16:25:57,411 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 [2022-12-14 16:25:57,428 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:25:57,501 INFO L321 Elim1Store]: treesize reduction 24, result has 47.8 percent of original size [2022-12-14 16:25:57,502 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 181 [2022-12-14 16:25:57,621 INFO L321 Elim1Store]: treesize reduction 50, result has 45.1 percent of original size [2022-12-14 16:25:57,621 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 [2022-12-14 16:25:58,993 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:26:02,942 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '119974#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:26:02,943 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:26:02,943 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:26:02,943 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 29, 29] total 73 [2022-12-14 16:26:02,943 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147942439] [2022-12-14 16:26:02,943 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:26:02,943 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2022-12-14 16:26:02,943 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:26:02,944 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2022-12-14 16:26:02,944 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=374, Invalid=7458, Unknown=0, NotChecked=0, Total=7832 [2022-12-14 16:26:02,944 INFO L87 Difference]: Start difference. First operand 3112 states and 3684 transitions. Second operand has 74 states, 74 states have (on average 2.72972972972973) internal successors, (202), 73 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:26:10,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:26:10,379 INFO L93 Difference]: Finished difference Result 10649 states and 12547 transitions. [2022-12-14 16:26:10,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-12-14 16:26:10,379 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 2.72972972972973) internal successors, (202), 73 states have internal predecessors, (202), 0 states have call successors, (0), 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 83 [2022-12-14 16:26:10,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:26:10,386 INFO L225 Difference]: With dead ends: 10649 [2022-12-14 16:26:10,386 INFO L226 Difference]: Without dead ends: 10540 [2022-12-14 16:26:10,387 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 323 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4332 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=1350, Invalid=18110, Unknown=0, NotChecked=0, Total=19460 [2022-12-14 16:26:10,387 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 1304 mSDsluCounter, 1788 mSDsCounter, 0 mSdLazyCounter, 4651 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1304 SdHoareTripleChecker+Valid, 1851 SdHoareTripleChecker+Invalid, 4662 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 4651 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2022-12-14 16:26:10,388 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1304 Valid, 1851 Invalid, 4662 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 4651 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2022-12-14 16:26:10,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10540 states. [2022-12-14 16:26:10,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10540 to 5545. [2022-12-14 16:26:10,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5545 states, 5543 states have (on average 1.1823922063864334) internal successors, (6554), 5544 states have internal predecessors, (6554), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:26:10,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5545 states to 5545 states and 6554 transitions. [2022-12-14 16:26:10,473 INFO L78 Accepts]: Start accepts. Automaton has 5545 states and 6554 transitions. Word has length 83 [2022-12-14 16:26:10,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:26:10,474 INFO L495 AbstractCegarLoop]: Abstraction has 5545 states and 6554 transitions. [2022-12-14 16:26:10,474 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 2.72972972972973) internal successors, (202), 73 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:26:10,474 INFO L276 IsEmpty]: Start isEmpty. Operand 5545 states and 6554 transitions. [2022-12-14 16:26:10,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2022-12-14 16:26:10,478 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:26:10,478 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:26:10,483 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2022-12-14 16:26:10,678 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:26:10,679 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:26:10,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:26:10,680 INFO L85 PathProgramCache]: Analyzing trace with hash 1243467718, now seen corresponding path program 13 times [2022-12-14 16:26:10,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:26:10,681 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1028228220] [2022-12-14 16:26:10,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:26:10,681 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:26:10,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:26:11,123 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 25 proven. 220 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:26:11,123 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:26:11,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1028228220] [2022-12-14 16:26:11,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1028228220] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:26:11,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [904115967] [2022-12-14 16:26:11,123 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 16:26:11,124 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:26:11,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:26:11,124 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:26:11,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-12-14 16:26:11,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:26:11,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 510 conjuncts, 50 conjunts are in the unsatisfiable core [2022-12-14 16:26:11,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:26:11,462 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 36 proven. 209 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:26:11,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:26:11,705 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 [2022-12-14 16:26:11,775 INFO L134 CoverageAnalysis]: Checked inductivity of 246 backedges. 36 proven. 209 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:26:11,776 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [904115967] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 16:26:11,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1563479704] [2022-12-14 16:26:11,776 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-12-14 16:26:11,776 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 16:26:11,776 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 16:26:11,777 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 16:26:11,777 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 16:26:11,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-12-14 16:26:11,800 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 [2022-12-14 16:26:11,825 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-12-14 16:26:11,852 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:26:11,877 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:26:11,908 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:26:11,940 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 [2022-12-14 16:26:11,975 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 14 treesize of output 10 [2022-12-14 16:26:12,002 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:26:12,032 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:26:12,073 INFO L321 Elim1Store]: treesize reduction 36, result has 21.7 percent of original size [2022-12-14 16:26:12,073 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 [2022-12-14 16:26:12,301 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 16:26:14,336 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '136829#(and (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.base|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.offset|) (<= |ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~i~1#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.base|) (< (select |#length| |ULTIMATE.start_cstrspn_~sc1~0#1.base|) (+ |ULTIMATE.start_cstrspn_~sc1~0#1.offset| 1)) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.offset|) (<= 0 |ULTIMATE.start_main_#t~malloc13#1.base|) (<= 1 |ULTIMATE.start_main_~length1~0#1|) (<= 0 |ULTIMATE.start_cstrspn_#in~s2#1.offset|) (<= |ULTIMATE.start_cstrspn_~s1#1.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString1~0#1.base|) (<= 1 |ULTIMATE.start_main_~length2~0#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= 0 |ULTIMATE.start_cstrspn_~sc1~0#1.offset|) (= |ULTIMATE.start_main_#t~malloc13#1.offset| 0) (<= |ULTIMATE.start_main_~length1~0#1| 2147483647) (<= 0 |ULTIMATE.start_cstrspn_~s1#1.offset|) (<= |ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s1#1.offset| 0) (= |ULTIMATE.start_main_#t~malloc12#1.offset| 0) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_cstrspn_~s2#1.offset|) (<= 0 |ULTIMATE.start_cstrspn_#in~s1#1.base|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~length2~0#1| 2147483647) (<= |ULTIMATE.start_cstrspn_~s2#1.offset| 0) (<= |ULTIMATE.start_cstrspn_#in~s2#1.offset| 0) (<= 0 |ULTIMATE.start_main_#t~malloc12#1.base|) (<= 0 |ULTIMATE.start_main_~nondetString2~0#1.base|) (= |#NULL.base| 0))' at error location [2022-12-14 16:26:14,336 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 16:26:14,336 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 16:26:14,336 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 18] total 38 [2022-12-14 16:26:14,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125886376] [2022-12-14 16:26:14,336 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 16:26:14,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-12-14 16:26:14,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 16:26:14,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-12-14 16:26:14,337 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=296, Invalid=2674, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 16:26:14,337 INFO L87 Difference]: Start difference. First operand 5545 states and 6554 transitions. Second operand has 40 states, 39 states have (on average 4.641025641025641) internal successors, (181), 39 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:26:15,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 16:26:15,100 INFO L93 Difference]: Finished difference Result 9101 states and 10750 transitions. [2022-12-14 16:26:15,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 16:26:15,101 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 39 states have (on average 4.641025641025641) internal successors, (181), 39 states have internal predecessors, (181), 0 states have call successors, (0), 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 85 [2022-12-14 16:26:15,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 16:26:15,106 INFO L225 Difference]: With dead ends: 9101 [2022-12-14 16:26:15,106 INFO L226 Difference]: Without dead ends: 9101 [2022-12-14 16:26:15,106 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 209 SyntacticMatches, 8 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1599 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=723, Invalid=4389, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 16:26:15,107 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 566 mSDsluCounter, 528 mSDsCounter, 0 mSdLazyCounter, 1466 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 566 SdHoareTripleChecker+Valid, 573 SdHoareTripleChecker+Invalid, 1468 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 1466 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 16:26:15,107 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [566 Valid, 573 Invalid, 1468 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 1466 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 16:26:15,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9101 states. [2022-12-14 16:26:15,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9101 to 5922. [2022-12-14 16:26:15,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5922 states, 5920 states have (on average 1.1824324324324325) internal successors, (7000), 5921 states have internal predecessors, (7000), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:26:15,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5922 states to 5922 states and 7000 transitions. [2022-12-14 16:26:15,174 INFO L78 Accepts]: Start accepts. Automaton has 5922 states and 7000 transitions. Word has length 85 [2022-12-14 16:26:15,174 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 16:26:15,174 INFO L495 AbstractCegarLoop]: Abstraction has 5922 states and 7000 transitions. [2022-12-14 16:26:15,175 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 39 states have (on average 4.641025641025641) internal successors, (181), 39 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 16:26:15,175 INFO L276 IsEmpty]: Start isEmpty. Operand 5922 states and 7000 transitions. [2022-12-14 16:26:15,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2022-12-14 16:26:15,179 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 16:26:15,179 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 16:26:15,183 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2022-12-14 16:26:15,379 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2022-12-14 16:26:15,381 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 16 more)] === [2022-12-14 16:26:15,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 16:26:15,381 INFO L85 PathProgramCache]: Analyzing trace with hash 751955647, now seen corresponding path program 24 times [2022-12-14 16:26:15,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 16:26:15,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1376551805] [2022-12-14 16:26:15,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 16:26:15,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 16:26:15,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 16:26:16,369 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 37 proven. 432 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:26:16,369 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 16:26:16,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1376551805] [2022-12-14 16:26:16,369 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1376551805] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 16:26:16,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [753169321] [2022-12-14 16:26:16,369 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 16:26:16,369 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 16:26:16,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 16:26:16,370 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 16:26:16,370 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dedac74a-28b3-44c8-885e-7762e8bb9d8b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-12-14 16:26:16,715 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 16:26:16,715 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 16:26:16,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 537 conjuncts, 128 conjunts are in the unsatisfiable core [2022-12-14 16:26:16,721 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 16:26:17,131 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2022-12-14 16:30:39,848 INFO L321 Elim1Store]: treesize reduction 49, result has 49.5 percent of original size [2022-12-14 16:30:39,848 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 13 select indices, 13 select index equivalence classes, 0 disjoint index pairs (out of 78 index pairs), introduced 13 new quantified variables, introduced 78 case distinctions, treesize of input 142 treesize of output 108 [2022-12-14 16:30:39,853 WARN L718 sPolynomialRelations]: Constructing 2048(two to the power of 11 dual juncts. [2022-12-14 16:30:39,887 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 42 proven. 174 refuted. 253 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 16:30:39,888 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 16:31:08,863 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 181 treesize of output 157 [2022-12-14 16:31:08,870 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-12-14 16:31:08,870 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 181 treesize of output 133