./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 38b53e6a Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur --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 b3d7899c651fa61cfb9cf623e0f4ceb470fe32eb0d0272d2277c965ed07c2f88 --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-38b53e6 [2022-11-25 23:19:20,976 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-25 23:19:20,979 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-25 23:19:21,001 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-25 23:19:21,002 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-25 23:19:21,003 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-25 23:19:21,005 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-25 23:19:21,007 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-25 23:19:21,009 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-25 23:19:21,010 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-25 23:19:21,011 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-25 23:19:21,013 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-25 23:19:21,013 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-25 23:19:21,015 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-25 23:19:21,016 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-25 23:19:21,017 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-25 23:19:21,018 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-25 23:19:21,020 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-25 23:19:21,022 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-25 23:19:21,024 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-25 23:19:21,026 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-25 23:19:21,028 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-25 23:19:21,029 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-25 23:19:21,031 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-25 23:19:21,035 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-25 23:19:21,036 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-25 23:19:21,036 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-25 23:19:21,038 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-25 23:19:21,038 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-25 23:19:21,040 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-25 23:19:21,040 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-25 23:19:21,042 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-25 23:19:21,043 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-25 23:19:21,044 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-25 23:19:21,045 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-25 23:19:21,046 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-25 23:19:21,047 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-25 23:19:21,047 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-25 23:19:21,047 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-25 23:19:21,049 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-25 23:19:21,050 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-25 23:19:21,051 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-11-25 23:19:21,092 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-25 23:19:21,099 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-25 23:19:21,101 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-25 23:19:21,101 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-25 23:19:21,102 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-25 23:19:21,102 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-25 23:19:21,103 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-25 23:19:21,103 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-25 23:19:21,104 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-25 23:19:21,104 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-25 23:19:21,105 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-25 23:19:21,106 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-25 23:19:21,106 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-25 23:19:21,106 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-25 23:19:21,107 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-25 23:19:21,107 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-25 23:19:21,107 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-25 23:19:21,108 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-25 23:19:21,109 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-25 23:19:21,109 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-25 23:19:21,114 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-25 23:19:21,114 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-25 23:19:21,115 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-25 23:19:21,115 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-25 23:19:21,115 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-25 23:19:21,116 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-25 23:19:21,116 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-25 23:19:21,116 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-25 23:19:21,117 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-25 23:19:21,117 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-25 23:19:21,117 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-25 23:19:21,118 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-25 23:19:21,118 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-25 23:19:21,118 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-25 23:19:21,119 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-25 23:19:21,119 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:19:21,119 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-25 23:19:21,120 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-25 23:19:21,120 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-25 23:19:21,120 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-25 23:19:21,121 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-25 23:19:21,121 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-25 23:19:21,121 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_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b3d7899c651fa61cfb9cf623e0f4ceb470fe32eb0d0272d2277c965ed07c2f88 [2022-11-25 23:19:21,485 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-25 23:19:21,527 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-25 23:19:21,530 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-25 23:19:21,532 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-25 23:19:21,533 INFO L275 PluginConnector]: CDTParser initialized [2022-11-25 23:19:21,534 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i [2022-11-25 23:19:24,802 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-25 23:19:25,065 INFO L351 CDTParser]: Found 1 translation units. [2022-11-25 23:19:25,066 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i [2022-11-25 23:19:25,079 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/data/df842b1b7/c85dcb4694d74fb49496098954cd7a48/FLAG28e73f2de [2022-11-25 23:19:25,096 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/data/df842b1b7/c85dcb4694d74fb49496098954cd7a48 [2022-11-25 23:19:25,099 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-25 23:19:25,101 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-25 23:19:25,103 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-25 23:19:25,103 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-25 23:19:25,107 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-25 23:19:25,108 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:19:25" (1/1) ... [2022-11-25 23:19:25,109 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@626006a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:19:25, skipping insertion in model container [2022-11-25 23:19:25,110 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 11:19:25" (1/1) ... [2022-11-25 23:19:25,118 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-25 23:19:25,154 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-25 23:19:25,432 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i[24038,24051] [2022-11-25 23:19:25,434 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:19:25,443 INFO L203 MainTranslator]: Completed pre-run [2022-11-25 23:19:25,487 WARN L237 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i[24038,24051] [2022-11-25 23:19:25,488 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-25 23:19:25,516 INFO L208 MainTranslator]: Completed translation [2022-11-25 23:19:25,516 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:19:25 WrapperNode [2022-11-25 23:19:25,517 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-25 23:19:25,518 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-25 23:19:25,518 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-25 23:19:25,518 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-25 23:19:25,526 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:19:25" (1/1) ... [2022-11-25 23:19:25,540 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:19:25" (1/1) ... [2022-11-25 23:19:25,562 INFO L138 Inliner]: procedures = 126, calls = 30, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 108 [2022-11-25 23:19:25,563 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-25 23:19:25,564 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-25 23:19:25,564 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-25 23:19:25,564 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-25 23:19:25,573 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:19:25" (1/1) ... [2022-11-25 23:19:25,573 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:19:25" (1/1) ... [2022-11-25 23:19:25,577 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:19:25" (1/1) ... [2022-11-25 23:19:25,578 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:19:25" (1/1) ... [2022-11-25 23:19:25,584 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:19:25" (1/1) ... [2022-11-25 23:19:25,588 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:19:25" (1/1) ... [2022-11-25 23:19:25,590 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:19:25" (1/1) ... [2022-11-25 23:19:25,591 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:19:25" (1/1) ... [2022-11-25 23:19:25,594 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-25 23:19:25,595 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-25 23:19:25,595 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-25 23:19:25,595 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-25 23:19:25,596 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:19:25" (1/1) ... [2022-11-25 23:19:25,613 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-25 23:19:25,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:19:25,648 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-25 23:19:25,677 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-25 23:19:25,710 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2022-11-25 23:19:25,710 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-25 23:19:25,711 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-25 23:19:25,711 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-25 23:19:25,711 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-11-25 23:19:25,711 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-11-25 23:19:25,711 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-25 23:19:25,712 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2022-11-25 23:19:25,712 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-25 23:19:25,712 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-25 23:19:25,712 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-25 23:19:25,884 INFO L235 CfgBuilder]: Building ICFG [2022-11-25 23:19:25,900 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-25 23:19:26,260 INFO L276 CfgBuilder]: Performing block encoding [2022-11-25 23:19:26,309 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-25 23:19:26,309 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-11-25 23:19:26,312 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:19:26 BoogieIcfgContainer [2022-11-25 23:19:26,312 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-25 23:19:26,316 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-25 23:19:26,316 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-25 23:19:26,320 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-25 23:19:26,320 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 11:19:25" (1/3) ... [2022-11-25 23:19:26,321 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@973d39 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:19:26, skipping insertion in model container [2022-11-25 23:19:26,322 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 11:19:25" (2/3) ... [2022-11-25 23:19:26,322 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@973d39 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 11:19:26, skipping insertion in model container [2022-11-25 23:19:26,322 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 11:19:26" (3/3) ... [2022-11-25 23:19:26,324 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2n_remove_all_reverse.i [2022-11-25 23:19:26,347 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-25 23:19:26,348 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 32 error locations. [2022-11-25 23:19:26,400 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-25 23:19:26,408 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;@27a0da6b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-25 23:19:26,409 INFO L358 AbstractCegarLoop]: Starting to check reachability of 32 error locations. [2022-11-25 23:19:26,414 INFO L276 IsEmpty]: Start isEmpty. Operand has 62 states, 29 states have (on average 2.3448275862068964) internal successors, (68), 61 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:26,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-25 23:19:26,422 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:26,423 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-25 23:19:26,424 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr28REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:19:26,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:26,433 INFO L85 PathProgramCache]: Analyzing trace with hash 4990986, now seen corresponding path program 1 times [2022-11-25 23:19:26,466 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:26,467 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [594808422] [2022-11-25 23:19:26,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:26,468 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:26,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:26,861 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:19:26,862 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:26,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [594808422] [2022-11-25 23:19:26,863 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [594808422] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:19:26,864 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:19:26,864 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 23:19:26,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239882743] [2022-11-25 23:19:26,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:19:26,872 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:19:26,872 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:26,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:19:26,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:19:26,911 INFO L87 Difference]: Start difference. First operand has 62 states, 29 states have (on average 2.3448275862068964) internal successors, (68), 61 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:26,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:26,980 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2022-11-25 23:19:26,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:19:26,984 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-25 23:19:26,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:26,993 INFO L225 Difference]: With dead ends: 74 [2022-11-25 23:19:26,993 INFO L226 Difference]: Without dead ends: 71 [2022-11-25 23:19:26,995 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:19:26,998 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 12 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:26,999 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 112 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:19:27,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2022-11-25 23:19:27,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 61. [2022-11-25 23:19:27,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 29 states have (on average 2.206896551724138) internal successors, (64), 60 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:27,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2022-11-25 23:19:27,036 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 4 [2022-11-25 23:19:27,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:27,036 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2022-11-25 23:19:27,036 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:27,036 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2022-11-25 23:19:27,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-25 23:19:27,037 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:27,037 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-25 23:19:27,037 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-25 23:19:27,038 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:19:27,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:27,038 INFO L85 PathProgramCache]: Analyzing trace with hash 4866058, now seen corresponding path program 1 times [2022-11-25 23:19:27,039 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:27,039 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [465257522] [2022-11-25 23:19:27,039 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:27,039 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:27,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:27,115 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:19:27,116 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:27,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [465257522] [2022-11-25 23:19:27,116 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [465257522] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:19:27,116 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:19:27,116 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 23:19:27,117 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1374520794] [2022-11-25 23:19:27,117 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:19:27,118 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:19:27,118 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:27,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:19:27,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:19:27,120 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:27,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:27,248 INFO L93 Difference]: Finished difference Result 101 states and 107 transitions. [2022-11-25 23:19:27,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:19:27,249 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-25 23:19:27,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:27,250 INFO L225 Difference]: With dead ends: 101 [2022-11-25 23:19:27,251 INFO L226 Difference]: Without dead ends: 101 [2022-11-25 23:19:27,251 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:19:27,253 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 50 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 53 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:27,254 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 53 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:19:27,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-25 23:19:27,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 59. [2022-11-25 23:19:27,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 29 states have (on average 2.1379310344827585) internal successors, (62), 58 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:27,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2022-11-25 23:19:27,262 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 4 [2022-11-25 23:19:27,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:27,263 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2022-11-25 23:19:27,263 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:27,263 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2022-11-25 23:19:27,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2022-11-25 23:19:27,264 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:27,264 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2022-11-25 23:19:27,264 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-25 23:19:27,265 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:19:27,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:27,266 INFO L85 PathProgramCache]: Analyzing trace with hash 4866059, now seen corresponding path program 1 times [2022-11-25 23:19:27,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:27,266 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1586677550] [2022-11-25 23:19:27,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:27,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:27,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:27,366 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:19:27,367 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:27,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1586677550] [2022-11-25 23:19:27,367 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1586677550] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:19:27,367 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:19:27,368 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-25 23:19:27,368 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2099774871] [2022-11-25 23:19:27,368 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:19:27,369 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-25 23:19:27,369 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:27,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-25 23:19:27,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:19:27,370 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:27,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:27,429 INFO L93 Difference]: Finished difference Result 57 states and 60 transitions. [2022-11-25 23:19:27,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-25 23:19:27,429 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2022-11-25 23:19:27,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:27,430 INFO L225 Difference]: With dead ends: 57 [2022-11-25 23:19:27,431 INFO L226 Difference]: Without dead ends: 57 [2022-11-25 23:19:27,431 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-25 23:19:27,432 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 56 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:27,433 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 32 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:19:27,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2022-11-25 23:19:27,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2022-11-25 23:19:27,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 29 states have (on average 2.0689655172413794) internal successors, (60), 56 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:27,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2022-11-25 23:19:27,439 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 4 [2022-11-25 23:19:27,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:27,440 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2022-11-25 23:19:27,440 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:27,440 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2022-11-25 23:19:27,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-25 23:19:27,441 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:27,441 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-25 23:19:27,441 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-25 23:19:27,441 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:19:27,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:27,442 INFO L85 PathProgramCache]: Analyzing trace with hash 381317508, now seen corresponding path program 1 times [2022-11-25 23:19:27,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:27,443 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1435674608] [2022-11-25 23:19:27,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:27,443 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:27,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:27,581 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:19:27,581 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:27,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1435674608] [2022-11-25 23:19:27,582 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1435674608] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:19:27,582 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:19:27,583 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:19:27,583 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282997038] [2022-11-25 23:19:27,583 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:19:27,585 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 23:19:27,586 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:27,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 23:19:27,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-25 23:19:27,587 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:27,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:27,759 INFO L93 Difference]: Finished difference Result 101 states and 107 transitions. [2022-11-25 23:19:27,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 23:19:27,760 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-25 23:19:27,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:27,761 INFO L225 Difference]: With dead ends: 101 [2022-11-25 23:19:27,762 INFO L226 Difference]: Without dead ends: 101 [2022-11-25 23:19:27,762 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:19:27,764 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 94 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:27,765 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 76 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:19:27,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-11-25 23:19:27,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 56. [2022-11-25 23:19:27,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 55 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:27,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2022-11-25 23:19:27,772 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 6 [2022-11-25 23:19:27,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:27,772 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2022-11-25 23:19:27,773 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:27,773 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2022-11-25 23:19:27,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-25 23:19:27,773 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:27,774 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-25 23:19:27,774 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-25 23:19:27,774 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:19:27,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:27,775 INFO L85 PathProgramCache]: Analyzing trace with hash 381317509, now seen corresponding path program 1 times [2022-11-25 23:19:27,775 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:27,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [168512403] [2022-11-25 23:19:27,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:27,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:27,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:28,018 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:19:28,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:28,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [168512403] [2022-11-25 23:19:28,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [168512403] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:19:28,020 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:19:28,020 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-25 23:19:28,020 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906631266] [2022-11-25 23:19:28,021 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:19:28,021 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-25 23:19:28,021 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:28,022 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-25 23:19:28,022 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-25 23:19:28,023 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:28,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:28,100 INFO L93 Difference]: Finished difference Result 58 states and 61 transitions. [2022-11-25 23:19:28,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 23:19:28,101 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2022-11-25 23:19:28,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:28,102 INFO L225 Difference]: With dead ends: 58 [2022-11-25 23:19:28,102 INFO L226 Difference]: Without dead ends: 58 [2022-11-25 23:19:28,103 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:19:28,104 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 107 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:28,105 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 31 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:19:28,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-11-25 23:19:28,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 55. [2022-11-25 23:19:28,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 29 states have (on average 2.0) internal successors, (58), 54 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:28,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2022-11-25 23:19:28,111 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 6 [2022-11-25 23:19:28,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:28,112 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2022-11-25 23:19:28,112 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:28,113 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2022-11-25 23:19:28,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-25 23:19:28,113 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:28,114 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:19:28,114 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-25 23:19:28,114 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr28REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:19:28,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:28,115 INFO L85 PathProgramCache]: Analyzing trace with hash -355324193, now seen corresponding path program 1 times [2022-11-25 23:19:28,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:28,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2017483540] [2022-11-25 23:19:28,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:28,116 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:28,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:28,233 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:19:28,234 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:28,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2017483540] [2022-11-25 23:19:28,234 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2017483540] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:19:28,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1762569414] [2022-11-25 23:19:28,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:28,235 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:28,235 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:19:28,239 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:19:28,245 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-25 23:19:28,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:28,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-25 23:19:28,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:19:28,454 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:19:28,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:19:28,500 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:19:28,500 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1762569414] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:19:28,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1605852118] [2022-11-25 23:19:28,526 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-25 23:19:28,527 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:19:28,534 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:19:28,541 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:19:28,542 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:19:28,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:28,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:28,670 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-25 23:19:28,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:28,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:28,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:28,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:28,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:28,751 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-25 23:19:28,855 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 13 treesize of output 9 [2022-11-25 23:19:28,871 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 13 treesize of output 9 [2022-11-25 23:19:28,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:28,896 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 21 [2022-11-25 23:19:28,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:28,967 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:19:28,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:28,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:29,002 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:19:29,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:29,029 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:19:29,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:29,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:29,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:29,111 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-25 23:19:29,133 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:29,136 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 23 treesize of output 13 [2022-11-25 23:19:29,154 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:29,155 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 23 treesize of output 13 [2022-11-25 23:19:29,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:29,258 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:29,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:29,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:29,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:29,265 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:29,266 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:29,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:29,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:29,272 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-25 23:19:29,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:29,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:29,514 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:19:29,515 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 345 treesize of output 327 [2022-11-25 23:19:29,578 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:19:29,579 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 339 treesize of output 346 [2022-11-25 23:19:29,643 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:19:29,644 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 333 treesize of output 340 [2022-11-25 23:19:30,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:30,062 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:19:30,063 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 366 treesize of output 367 [2022-11-25 23:19:30,098 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:30,137 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:19:30,138 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 347 treesize of output 348 [2022-11-25 23:19:30,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:30,230 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:19:30,233 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 356 treesize of output 357 [2022-11-25 23:19:31,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:31,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:31,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:31,137 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:31,146 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-25 23:19:31,147 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 356 treesize of output 341 [2022-11-25 23:19:31,175 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:31,176 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:31,196 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:19:31,197 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 2 case distinctions, treesize of input 352 treesize of output 345 [2022-11-25 23:19:31,225 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:31,227 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:31,246 INFO L321 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2022-11-25 23:19:31,246 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 2 case distinctions, treesize of input 424 treesize of output 417 [2022-11-25 23:19:31,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:31,514 INFO L321 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-25 23:19:31,514 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 425 treesize of output 429 [2022-11-25 23:19:31,843 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:19:31,843 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 339 treesize of output 346 [2022-11-25 23:19:31,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:31,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:31,882 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:19:31,883 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 339 treesize of output 321 [2022-11-25 23:19:31,940 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:19:31,942 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 333 treesize of output 340 [2022-11-25 23:19:32,309 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:32,344 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:19:32,346 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 659 treesize of output 640 [2022-11-25 23:19:32,385 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:32,421 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:19:32,427 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 664 treesize of output 665 [2022-11-25 23:19:32,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:32,492 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:19:32,492 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 658 treesize of output 659 [2022-11-25 23:19:33,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:33,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:33,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:33,124 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:33,133 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-25 23:19:33,134 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 356 treesize of output 341 [2022-11-25 23:19:33,163 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:33,164 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:33,181 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:19:33,182 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 2 case distinctions, treesize of input 352 treesize of output 345 [2022-11-25 23:19:33,207 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:33,208 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:33,224 INFO L321 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2022-11-25 23:19:33,225 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 2 case distinctions, treesize of input 424 treesize of output 417 [2022-11-25 23:19:33,435 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 6 treesize of output 5 [2022-11-25 23:19:33,443 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 9 [2022-11-25 23:19:33,450 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:19:36,614 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [1605852118] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:19:36,614 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:19:36,614 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 10 [2022-11-25 23:19:36,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1449177606] [2022-11-25 23:19:36,615 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:19:36,616 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-25 23:19:36,616 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:36,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-25 23:19:36,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2022-11-25 23:19:36,617 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:37,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:37,112 INFO L93 Difference]: Finished difference Result 88 states and 93 transitions. [2022-11-25 23:19:37,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-25 23:19:37,113 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2022-11-25 23:19:37,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:37,114 INFO L225 Difference]: With dead ends: 88 [2022-11-25 23:19:37,114 INFO L226 Difference]: Without dead ends: 88 [2022-11-25 23:19:37,114 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2022-11-25 23:19:37,115 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 83 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 189 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:37,116 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 93 Invalid, 189 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-25 23:19:37,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-25 23:19:37,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2022-11-25 23:19:37,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 30 states have (on average 1.9666666666666666) internal successors, (59), 55 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:37,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2022-11-25 23:19:37,120 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 9 [2022-11-25 23:19:37,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:37,121 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2022-11-25 23:19:37,121 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.125) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:37,121 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2022-11-25 23:19:37,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-25 23:19:37,121 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:37,122 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:19:37,130 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-25 23:19:37,330 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:37,331 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:19:37,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:37,331 INFO L85 PathProgramCache]: Analyzing trace with hash -355327076, now seen corresponding path program 1 times [2022-11-25 23:19:37,331 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:37,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917032761] [2022-11-25 23:19:37,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:37,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:37,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:37,401 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:19:37,402 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:37,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [917032761] [2022-11-25 23:19:37,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [917032761] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:19:37,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1777028655] [2022-11-25 23:19:37,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:37,403 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:37,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:19:37,404 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:19:37,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-25 23:19:37,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:37,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 5 conjunts are in the unsatisfiable core [2022-11-25 23:19:37,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:19:37,534 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:19:37,534 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:19:37,567 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:19:37,567 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1777028655] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:19:37,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1624972224] [2022-11-25 23:19:37,570 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-25 23:19:37,570 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:19:37,570 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:19:37,571 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:19:37,571 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:19:37,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,607 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-25 23:19:37,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,651 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-25 23:19:37,719 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 13 treesize of output 9 [2022-11-25 23:19:37,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,733 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 21 [2022-11-25 23:19:37,747 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 13 treesize of output 9 [2022-11-25 23:19:37,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,804 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:19:37,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,821 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:19:37,837 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,839 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:19:37,880 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:37,881 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 23 treesize of output 13 [2022-11-25 23:19:37,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,901 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-25 23:19:37,917 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:37,918 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 23 treesize of output 13 [2022-11-25 23:19:37,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:37,970 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-25 23:19:38,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:38,069 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:38,076 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:19:38,077 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 345 treesize of output 327 [2022-11-25 23:19:38,124 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:19:38,125 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 339 treesize of output 346 [2022-11-25 23:19:38,177 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:19:38,178 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 333 treesize of output 340 [2022-11-25 23:19:38,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:38,434 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:19:38,435 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 366 treesize of output 367 [2022-11-25 23:19:38,483 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:38,519 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:19:38,521 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 347 treesize of output 348 [2022-11-25 23:19:38,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:38,592 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:19:38,593 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 356 treesize of output 357 [2022-11-25 23:19:39,003 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:39,005 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:39,032 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:19:39,033 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 2 case distinctions, treesize of input 356 treesize of output 349 [2022-11-25 23:19:39,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:39,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:39,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:39,087 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:39,095 INFO L321 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-11-25 23:19:39,096 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 438 treesize of output 423 [2022-11-25 23:19:39,119 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:39,120 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:39,137 INFO L321 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2022-11-25 23:19:39,138 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 2 case distinctions, treesize of input 434 treesize of output 427 [2022-11-25 23:19:39,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:39,432 INFO L321 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-25 23:19:39,433 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 435 treesize of output 439 [2022-11-25 23:19:39,830 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:19:39,831 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 339 treesize of output 346 [2022-11-25 23:19:39,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:39,860 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:39,869 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:19:39,870 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 339 treesize of output 321 [2022-11-25 23:19:39,928 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:19:39,929 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 333 treesize of output 340 [2022-11-25 23:19:40,157 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:40,209 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:19:40,210 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 353 treesize of output 354 [2022-11-25 23:19:40,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:40,291 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:19:40,292 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 362 treesize of output 363 [2022-11-25 23:19:40,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:40,369 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:19:40,369 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 356 treesize of output 357 [2022-11-25 23:19:40,791 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:40,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:40,795 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:40,796 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:40,806 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-25 23:19:40,806 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 360 treesize of output 345 [2022-11-25 23:19:40,838 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:40,840 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:40,861 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:19:40,861 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 356 treesize of output 349 [2022-11-25 23:19:40,891 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:40,892 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:40,911 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:19:40,911 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 2 case distinctions, treesize of input 368 treesize of output 361 [2022-11-25 23:19:41,081 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 6 treesize of output 5 [2022-11-25 23:19:41,088 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 9 [2022-11-25 23:19:41,094 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:19:44,125 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1022#(and (= |ULTIMATE.start_sll_remove_last_~head#1.base| |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (= |ULTIMATE.start_sll_create_~head~0#1.base| |ULTIMATE.start_sll_create_#res#1.base|) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| |ULTIMATE.start_main_~#s~0#1.offset|) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) |ULTIMATE.start_sll_create_#res#1.offset|) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |#NULL.offset| 0) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| |ULTIMATE.start_sll_remove_last_~head#1.offset|) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (not (= (select |#valid| |ULTIMATE.start_sll_remove_last_~head#1.base|) 1)) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_sll_create_#res#1.offset| |ULTIMATE.start_sll_create_~head~0#1.offset|) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_remove_last_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |#NULL.offset|) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) |ULTIMATE.start_sll_create_#res#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (= |ULTIMATE.start_main_~len~0#1| (+ |ULTIMATE.start_main_~i~0#1| 1)) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-25 23:19:44,125 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:19:44,125 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:19:44,125 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 4 [2022-11-25 23:19:44,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076378454] [2022-11-25 23:19:44,126 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:19:44,127 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 23:19:44,127 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:44,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 23:19:44,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2022-11-25 23:19:44,129 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:44,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:44,167 INFO L93 Difference]: Finished difference Result 61 states and 64 transitions. [2022-11-25 23:19:44,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-25 23:19:44,167 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 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 9 [2022-11-25 23:19:44,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:44,168 INFO L225 Difference]: With dead ends: 61 [2022-11-25 23:19:44,168 INFO L226 Difference]: Without dead ends: 61 [2022-11-25 23:19:44,170 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2022-11-25 23:19:44,171 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 4 mSDsluCounter, 96 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:44,171 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 144 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:19:44,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-11-25 23:19:44,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-11-25 23:19:44,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 35 states have (on average 1.8285714285714285) internal successors, (64), 60 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:44,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2022-11-25 23:19:44,176 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 9 [2022-11-25 23:19:44,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:44,177 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2022-11-25 23:19:44,177 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:44,177 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2022-11-25 23:19:44,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-25 23:19:44,178 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:44,178 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1] [2022-11-25 23:19:44,191 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-25 23:19:44,386 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:44,387 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:19:44,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:44,387 INFO L85 PathProgramCache]: Analyzing trace with hash 1285036519, now seen corresponding path program 2 times [2022-11-25 23:19:44,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:44,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105446964] [2022-11-25 23:19:44,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:44,388 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:44,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:44,622 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-11-25 23:19:44,623 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:44,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1105446964] [2022-11-25 23:19:44,623 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1105446964] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:19:44,623 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [153487524] [2022-11-25 23:19:44,623 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:19:44,624 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:44,626 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:19:44,627 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:19:44,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-25 23:19:44,765 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 23:19:44,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:19:44,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-25 23:19:44,769 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:19:44,779 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-25 23:19:44,804 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-25 23:19:44,804 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 14 [2022-11-25 23:19:44,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:44,868 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 14 [2022-11-25 23:19:44,890 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:19:44,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:19:46,964 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:19:46,965 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [153487524] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:19:46,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1041140702] [2022-11-25 23:19:46,967 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-25 23:19:46,967 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:19:46,968 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:19:46,968 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:19:46,968 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:19:46,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:46,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:46,990 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-25 23:19:47,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,030 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-25 23:19:47,068 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 13 treesize of output 9 [2022-11-25 23:19:47,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,082 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 21 [2022-11-25 23:19:47,097 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 13 treesize of output 9 [2022-11-25 23:19:47,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,143 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:19:47,158 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,159 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:19:47,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,177 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:19:47,218 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:47,220 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 23 treesize of output 13 [2022-11-25 23:19:47,234 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:47,235 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 23 treesize of output 13 [2022-11-25 23:19:47,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,265 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-25 23:19:47,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,301 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,313 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-25 23:19:47,463 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:19:47,464 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 346 treesize of output 353 [2022-11-25 23:19:47,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:47,548 INFO L321 Elim1Store]: treesize reduction 49, result has 25.8 percent of original size [2022-11-25 23:19:47,549 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 346 treesize of output 338 [2022-11-25 23:19:47,607 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:19:47,607 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 336 treesize of output 343 [2022-11-25 23:19:47,971 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:48,046 INFO L321 Elim1Store]: treesize reduction 56, result has 29.1 percent of original size [2022-11-25 23:19:48,046 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 683 treesize of output 668 [2022-11-25 23:19:48,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:48,136 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:19:48,137 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 688 treesize of output 689 [2022-11-25 23:19:48,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:48,210 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:19:48,210 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 682 treesize of output 683 [2022-11-25 23:19:48,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:48,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:48,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:48,864 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:48,873 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-25 23:19:48,874 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 352 treesize of output 337 [2022-11-25 23:19:48,899 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:48,900 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:48,917 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:19:48,918 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 2 case distinctions, treesize of input 348 treesize of output 341 [2022-11-25 23:19:48,943 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:48,944 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:48,966 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:19:48,967 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 2 case distinctions, treesize of input 360 treesize of output 353 [2022-11-25 23:19:49,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:49,171 INFO L321 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-25 23:19:49,172 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 415 treesize of output 419 [2022-11-25 23:19:49,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:49,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:49,446 INFO L321 Elim1Store]: treesize reduction 49, result has 25.8 percent of original size [2022-11-25 23:19:49,446 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 352 treesize of output 344 [2022-11-25 23:19:49,504 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:19:49,505 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 342 treesize of output 349 [2022-11-25 23:19:49,558 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:19:49,559 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 336 treesize of output 343 [2022-11-25 23:19:49,914 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:49,978 INFO L321 Elim1Store]: treesize reduction 56, result has 29.1 percent of original size [2022-11-25 23:19:49,978 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 683 treesize of output 668 [2022-11-25 23:19:50,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:50,061 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:19:50,061 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 688 treesize of output 689 [2022-11-25 23:19:50,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:50,134 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:19:50,135 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 682 treesize of output 683 [2022-11-25 23:19:50,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:50,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:50,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:50,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:50,733 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:50,734 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:50,743 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-25 23:19:50,743 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 387 treesize of output 372 [2022-11-25 23:19:50,777 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:50,778 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:50,806 INFO L321 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-25 23:19:50,806 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 2 case distinctions, treesize of input 383 treesize of output 376 [2022-11-25 23:19:50,835 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:50,836 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:19:50,857 INFO L321 Elim1Store]: treesize reduction 33, result has 31.3 percent of original size [2022-11-25 23:19:50,858 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 2 case distinctions, treesize of input 437 treesize of output 430 [2022-11-25 23:19:51,054 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 6 treesize of output 5 [2022-11-25 23:19:51,062 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 9 [2022-11-25 23:19:51,074 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:19:54,565 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1239#(and (= |ULTIMATE.start_sll_remove_last_~head#1.base| |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (= |ULTIMATE.start_sll_create_~head~0#1.base| |ULTIMATE.start_sll_create_#res#1.base|) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| |ULTIMATE.start_main_~#s~0#1.offset|) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) |ULTIMATE.start_sll_create_#res#1.offset|) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |#NULL.offset| 0) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| |ULTIMATE.start_sll_remove_last_~head#1.offset|) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (not (= (select |#valid| |ULTIMATE.start_sll_remove_last_~head#1.base|) 1)) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_sll_create_#res#1.offset| |ULTIMATE.start_sll_create_~head~0#1.offset|) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_remove_last_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |#NULL.offset|) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) |ULTIMATE.start_sll_create_#res#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (= |ULTIMATE.start_main_~len~0#1| (+ |ULTIMATE.start_main_~i~0#1| 1)) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-25 23:19:54,565 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:19:54,565 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:19:54,565 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 3, 3] total 7 [2022-11-25 23:19:54,565 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140724054] [2022-11-25 23:19:54,565 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:19:54,566 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2022-11-25 23:19:54,566 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:19:54,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2022-11-25 23:19:54,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2022-11-25 23:19:54,567 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand has 9 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:54,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:19:54,846 INFO L93 Difference]: Finished difference Result 99 states and 105 transitions. [2022-11-25 23:19:54,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-25 23:19:54,847 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-11-25 23:19:54,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:19:54,847 INFO L225 Difference]: With dead ends: 99 [2022-11-25 23:19:54,847 INFO L226 Difference]: Without dead ends: 99 [2022-11-25 23:19:54,848 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=103, Invalid=277, Unknown=0, NotChecked=0, Total=380 [2022-11-25 23:19:54,848 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 143 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 112 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:19:54,849 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [143 Valid, 112 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:19:54,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-11-25 23:19:54,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 60. [2022-11-25 23:19:54,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 36 states have (on average 1.7777777777777777) internal successors, (64), 59 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:54,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2022-11-25 23:19:54,854 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 14 [2022-11-25 23:19:54,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:19:54,854 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2022-11-25 23:19:54,854 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.875) internal successors, (31), 8 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:19:54,854 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2022-11-25 23:19:54,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-11-25 23:19:54,855 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:19:54,855 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1] [2022-11-25 23:19:54,862 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-25 23:19:55,055 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-11-25 23:19:55,056 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:19:55,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:19:55,056 INFO L85 PathProgramCache]: Analyzing trace with hash 1285036520, now seen corresponding path program 1 times [2022-11-25 23:19:55,056 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:19:55,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75244606] [2022-11-25 23:19:55,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:55,057 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:19:55,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:55,410 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:19:55,410 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:19:55,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75244606] [2022-11-25 23:19:55,411 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [75244606] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:19:55,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [696627642] [2022-11-25 23:19:55,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:19:55,411 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:19:55,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:19:55,413 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:19:55,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-25 23:19:55,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:19:55,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 18 conjunts are in the unsatisfiable core [2022-11-25 23:19:55,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:19:55,552 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-25 23:19:55,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:55,584 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 14 [2022-11-25 23:19:55,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:19:55,630 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 14 [2022-11-25 23:19:55,695 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:19:55,695 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:19:59,983 WARN L837 $PredicateComparison]: unable to prove that (and (forall ((|v_ULTIMATE.start_node_create_~temp~0#1.base_27| Int)) (or (not (< |v_ULTIMATE.start_node_create_~temp~0#1.base_27| |c_#StackHeapBarrier|)) (forall ((|v_ULTIMATE.start_node_create_~temp~0#1.base_26| Int) (v_ArrVal_303 Int)) (or (forall ((v_ArrVal_304 Int)) (<= (+ |c_ULTIMATE.start_main_~#s~0#1.offset| 4) (select (store (store |c_#length| |v_ULTIMATE.start_node_create_~temp~0#1.base_27| v_ArrVal_303) |v_ULTIMATE.start_node_create_~temp~0#1.base_26| v_ArrVal_304) |c_ULTIMATE.start_main_~#s~0#1.base|))) (not (< |v_ULTIMATE.start_node_create_~temp~0#1.base_26| |c_#StackHeapBarrier|)))))) (<= 0 |c_ULTIMATE.start_main_~#s~0#1.offset|)) is different from false [2022-11-25 23:19:59,985 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2022-11-25 23:19:59,985 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [696627642] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:19:59,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [210138297] [2022-11-25 23:19:59,987 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2022-11-25 23:19:59,987 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:19:59,988 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:19:59,988 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:19:59,988 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:20:00,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,012 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-25 23:20:00,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,050 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-25 23:20:00,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,087 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 21 [2022-11-25 23:20:00,102 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 13 treesize of output 9 [2022-11-25 23:20:00,112 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 13 treesize of output 9 [2022-11-25 23:20:00,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,140 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:20:00,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,157 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:20:00,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,172 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:20:00,208 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:00,209 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 23 treesize of output 13 [2022-11-25 23:20:00,222 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:00,223 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 23 treesize of output 13 [2022-11-25 23:20:00,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,243 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-25 23:20:00,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,298 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-25 23:20:00,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,391 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:20:00,392 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 345 treesize of output 327 [2022-11-25 23:20:00,441 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:00,442 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 339 treesize of output 346 [2022-11-25 23:20:00,496 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:00,497 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 333 treesize of output 340 [2022-11-25 23:20:00,782 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:00,823 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:20:00,824 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 659 treesize of output 640 [2022-11-25 23:20:00,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,892 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:00,893 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 664 treesize of output 665 [2022-11-25 23:20:00,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:00,949 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:00,949 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 658 treesize of output 659 [2022-11-25 23:20:01,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:01,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:01,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:01,469 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:01,477 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-25 23:20:01,478 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 352 treesize of output 337 [2022-11-25 23:20:01,504 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:01,505 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:01,522 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:20:01,523 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 2 case distinctions, treesize of input 348 treesize of output 341 [2022-11-25 23:20:01,547 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:01,548 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:01,564 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:20:01,565 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 2 case distinctions, treesize of input 360 treesize of output 353 [2022-11-25 23:20:01,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:01,803 INFO L321 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-25 23:20:01,803 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 415 treesize of output 419 [2022-11-25 23:20:02,036 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:02,038 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 339 treesize of output 346 [2022-11-25 23:20:02,089 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:02,090 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 333 treesize of output 340 [2022-11-25 23:20:02,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:02,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:02,136 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:20:02,136 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 333 treesize of output 315 [2022-11-25 23:20:02,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:02,515 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:02,515 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 853 treesize of output 848 [2022-11-25 23:20:02,558 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:02,600 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:20:02,601 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 828 treesize of output 797 [2022-11-25 23:20:02,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:02,683 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:02,684 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 829 treesize of output 830 [2022-11-25 23:20:03,133 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:03,134 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:03,152 INFO L321 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-25 23:20:03,153 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 2 case distinctions, treesize of input 379 treesize of output 372 [2022-11-25 23:20:03,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:03,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:03,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:03,182 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:03,191 INFO L321 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-11-25 23:20:03,191 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 467 treesize of output 452 [2022-11-25 23:20:03,215 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:03,216 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:03,235 INFO L321 Elim1Store]: treesize reduction 51, result has 22.7 percent of original size [2022-11-25 23:20:03,236 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 2 case distinctions, treesize of input 463 treesize of output 456 [2022-11-25 23:20:03,426 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 6 treesize of output 5 [2022-11-25 23:20:03,436 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 9 [2022-11-25 23:20:03,439 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:20:07,158 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1505#(and (= |ULTIMATE.start_sll_remove_last_~head#1.base| |ULTIMATE.start_sll_remove_last_#in~head#1.base|) (= |ULTIMATE.start_sll_create_~head~0#1.base| |ULTIMATE.start_sll_create_#res#1.base|) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| |ULTIMATE.start_main_~#s~0#1.offset|) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) |ULTIMATE.start_sll_create_#res#1.offset|) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= |ULTIMATE.start_sll_create_~len#1| 0) (not (<= (+ |ULTIMATE.start_sll_remove_last_~head#1.offset| 4) (select |#length| |ULTIMATE.start_sll_remove_last_~head#1.base|))) (<= |#NULL.offset| 0) (= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| |ULTIMATE.start_sll_remove_last_~head#1.offset|) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_sll_create_#res#1.offset| |ULTIMATE.start_sll_create_~head~0#1.offset|) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_remove_last_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |#NULL.offset|) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) |ULTIMATE.start_sll_create_#res#1.base|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (= |ULTIMATE.start_main_~len~0#1| (+ |ULTIMATE.start_main_~i~0#1| 1)) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-25 23:20:07,158 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:20:07,159 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:20:07,159 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 3, 4] total 13 [2022-11-25 23:20:07,159 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [917642624] [2022-11-25 23:20:07,159 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:20:07,159 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-25 23:20:07,160 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:07,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-25 23:20:07,161 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=354, Unknown=1, NotChecked=40, Total=506 [2022-11-25 23:20:07,161 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand has 15 states, 14 states have (on average 3.0) internal successors, (42), 14 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:07,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:07,307 INFO L93 Difference]: Finished difference Result 55 states and 58 transitions. [2022-11-25 23:20:07,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 23:20:07,308 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.0) internal successors, (42), 14 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 14 [2022-11-25 23:20:07,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:07,309 INFO L225 Difference]: With dead ends: 55 [2022-11-25 23:20:07,309 INFO L226 Difference]: Without dead ends: 55 [2022-11-25 23:20:07,309 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 25 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 151 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=140, Invalid=415, Unknown=1, NotChecked=44, Total=600 [2022-11-25 23:20:07,310 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 260 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 260 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 51 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:07,310 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [260 Valid, 23 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 46 Invalid, 0 Unknown, 51 Unchecked, 0.1s Time] [2022-11-25 23:20:07,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2022-11-25 23:20:07,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2022-11-25 23:20:07,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 36 states have (on average 1.6111111111111112) internal successors, (58), 54 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:07,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2022-11-25 23:20:07,314 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 14 [2022-11-25 23:20:07,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:07,315 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2022-11-25 23:20:07,315 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 14 states have (on average 3.0) internal successors, (42), 14 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:07,315 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2022-11-25 23:20:07,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-25 23:20:07,315 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:07,315 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2022-11-25 23:20:07,331 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-25 23:20:07,526 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-25 23:20:07,526 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:20:07,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:07,527 INFO L85 PathProgramCache]: Analyzing trace with hash 1181426445, now seen corresponding path program 1 times [2022-11-25 23:20:07,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:07,527 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588907112] [2022-11-25 23:20:07,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:07,527 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:07,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:07,706 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 23:20:07,706 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:07,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588907112] [2022-11-25 23:20:07,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [588907112] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:20:07,707 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:20:07,707 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-25 23:20:07,707 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998759347] [2022-11-25 23:20:07,707 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:20:07,708 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-25 23:20:07,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:07,709 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-25 23:20:07,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-25 23:20:07,710 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand has 6 states, 5 states have (on average 2.2) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:07,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:07,891 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2022-11-25 23:20:07,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-25 23:20:07,891 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-25 23:20:07,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:07,892 INFO L225 Difference]: With dead ends: 82 [2022-11-25 23:20:07,892 INFO L226 Difference]: Without dead ends: 82 [2022-11-25 23:20:07,892 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2022-11-25 23:20:07,893 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 80 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 106 SdHoareTripleChecker+Invalid, 162 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:07,893 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 106 Invalid, 162 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:20:07,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-11-25 23:20:07,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 56. [2022-11-25 23:20:07,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 37 states have (on average 1.6216216216216217) internal successors, (60), 55 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:07,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2022-11-25 23:20:07,897 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 15 [2022-11-25 23:20:07,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:07,897 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2022-11-25 23:20:07,897 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 2.2) internal successors, (11), 6 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:07,897 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2022-11-25 23:20:07,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-25 23:20:07,904 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:07,905 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2022-11-25 23:20:07,905 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-11-25 23:20:07,905 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:20:07,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:07,906 INFO L85 PathProgramCache]: Analyzing trace with hash 1181426446, now seen corresponding path program 1 times [2022-11-25 23:20:07,906 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:07,906 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1974988457] [2022-11-25 23:20:07,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:07,907 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:07,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:08,254 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:20:08,254 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:08,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1974988457] [2022-11-25 23:20:08,254 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1974988457] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:20:08,254 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:20:08,254 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-25 23:20:08,255 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618295972] [2022-11-25 23:20:08,255 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:20:08,255 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-25 23:20:08,255 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:08,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-25 23:20:08,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-25 23:20:08,256 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:08,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:08,520 INFO L93 Difference]: Finished difference Result 77 states and 82 transitions. [2022-11-25 23:20:08,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-25 23:20:08,521 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-11-25 23:20:08,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:08,521 INFO L225 Difference]: With dead ends: 77 [2022-11-25 23:20:08,522 INFO L226 Difference]: Without dead ends: 77 [2022-11-25 23:20:08,522 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=103, Unknown=0, NotChecked=0, Total=156 [2022-11-25 23:20:08,523 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 266 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 100 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:08,523 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [266 Valid, 100 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:20:08,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-11-25 23:20:08,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 56. [2022-11-25 23:20:08,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 37 states have (on average 1.5945945945945945) internal successors, (59), 55 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:08,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2022-11-25 23:20:08,526 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 15 [2022-11-25 23:20:08,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:08,527 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2022-11-25 23:20:08,527 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:08,527 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2022-11-25 23:20:08,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-25 23:20:08,527 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:08,528 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:20:08,528 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2022-11-25 23:20:08,528 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:20:08,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:08,528 INFO L85 PathProgramCache]: Analyzing trace with hash -1381727097, now seen corresponding path program 1 times [2022-11-25 23:20:08,529 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:08,529 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [390952840] [2022-11-25 23:20:08,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:08,529 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:08,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:08,844 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:20:08,845 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:08,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [390952840] [2022-11-25 23:20:08,845 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [390952840] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:20:08,845 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:20:08,846 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-25 23:20:08,848 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056766940] [2022-11-25 23:20:08,848 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:20:08,848 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-25 23:20:08,849 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:08,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-25 23:20:08,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-25 23:20:08,850 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:09,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:09,196 INFO L93 Difference]: Finished difference Result 99 states and 105 transitions. [2022-11-25 23:20:09,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-25 23:20:09,197 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 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 18 [2022-11-25 23:20:09,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:09,198 INFO L225 Difference]: With dead ends: 99 [2022-11-25 23:20:09,198 INFO L226 Difference]: Without dead ends: 99 [2022-11-25 23:20:09,198 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=62, Invalid=120, Unknown=0, NotChecked=0, Total=182 [2022-11-25 23:20:09,199 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 341 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 341 SdHoareTripleChecker+Valid, 90 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:09,199 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [341 Valid, 90 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:20:09,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-11-25 23:20:09,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 63. [2022-11-25 23:20:09,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 44 states have (on average 1.6363636363636365) 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) [2022-11-25 23:20:09,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 72 transitions. [2022-11-25 23:20:09,203 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 72 transitions. Word has length 18 [2022-11-25 23:20:09,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:09,203 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 72 transitions. [2022-11-25 23:20:09,204 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:09,204 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 72 transitions. [2022-11-25 23:20:09,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-25 23:20:09,204 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:09,204 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:20:09,204 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-11-25 23:20:09,205 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr19REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:20:09,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:09,205 INFO L85 PathProgramCache]: Analyzing trace with hash -1381727098, now seen corresponding path program 1 times [2022-11-25 23:20:09,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:09,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2014544430] [2022-11-25 23:20:09,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:09,205 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:09,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:09,286 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 23:20:09,287 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:09,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2014544430] [2022-11-25 23:20:09,287 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2014544430] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:20:09,287 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:20:09,287 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-25 23:20:09,288 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440457839] [2022-11-25 23:20:09,288 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:20:09,288 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 23:20:09,288 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:09,289 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 23:20:09,289 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:20:09,289 INFO L87 Difference]: Start difference. First operand 63 states and 72 transitions. Second operand has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:09,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:09,412 INFO L93 Difference]: Finished difference Result 63 states and 70 transitions. [2022-11-25 23:20:09,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-25 23:20:09,413 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 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 18 [2022-11-25 23:20:09,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:09,413 INFO L225 Difference]: With dead ends: 63 [2022-11-25 23:20:09,413 INFO L226 Difference]: Without dead ends: 63 [2022-11-25 23:20:09,414 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-25 23:20:09,414 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 33 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:09,415 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 55 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:20:09,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2022-11-25 23:20:09,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2022-11-25 23:20:09,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 45 states have (on average 1.5555555555555556) internal successors, (70), 61 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:09,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 70 transitions. [2022-11-25 23:20:09,417 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 70 transitions. Word has length 18 [2022-11-25 23:20:09,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:09,418 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 70 transitions. [2022-11-25 23:20:09,418 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:09,418 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 70 transitions. [2022-11-25 23:20:09,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-25 23:20:09,418 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:09,419 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:20:09,419 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2022-11-25 23:20:09,419 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr12ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:20:09,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:09,419 INFO L85 PathProgramCache]: Analyzing trace with hash -1381742866, now seen corresponding path program 1 times [2022-11-25 23:20:09,419 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:09,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053081749] [2022-11-25 23:20:09,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:09,420 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:09,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:09,584 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:20:09,584 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:09,584 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053081749] [2022-11-25 23:20:09,585 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2053081749] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:20:09,585 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:20:09,585 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-25 23:20:09,586 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931718443] [2022-11-25 23:20:09,586 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:20:09,586 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-25 23:20:09,586 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:09,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-25 23:20:09,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-25 23:20:09,587 INFO L87 Difference]: Start difference. First operand 62 states and 70 transitions. Second operand has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:09,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:09,750 INFO L93 Difference]: Finished difference Result 61 states and 69 transitions. [2022-11-25 23:20:09,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-25 23:20:09,751 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 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 18 [2022-11-25 23:20:09,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:09,751 INFO L225 Difference]: With dead ends: 61 [2022-11-25 23:20:09,751 INFO L226 Difference]: Without dead ends: 61 [2022-11-25 23:20:09,751 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=119, Unknown=0, NotChecked=0, Total=182 [2022-11-25 23:20:09,752 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 207 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 207 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:09,752 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [207 Valid, 52 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:20:09,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-11-25 23:20:09,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-11-25 23:20:09,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 45 states have (on average 1.5333333333333334) internal successors, (69), 60 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:09,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 69 transitions. [2022-11-25 23:20:09,755 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 69 transitions. Word has length 18 [2022-11-25 23:20:09,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:09,755 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 69 transitions. [2022-11-25 23:20:09,755 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:09,755 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 69 transitions. [2022-11-25 23:20:09,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-25 23:20:09,756 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:09,756 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:20:09,756 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2022-11-25 23:20:09,756 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr13ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:20:09,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:09,756 INFO L85 PathProgramCache]: Analyzing trace with hash 115644206, now seen corresponding path program 1 times [2022-11-25 23:20:09,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:09,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392779129] [2022-11-25 23:20:09,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:09,757 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:09,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:09,982 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:20:09,982 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:09,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392779129] [2022-11-25 23:20:09,983 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [392779129] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:20:09,983 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:20:09,984 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-25 23:20:09,985 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209976761] [2022-11-25 23:20:09,985 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:20:09,985 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-25 23:20:09,986 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:09,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-25 23:20:09,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-25 23:20:09,987 INFO L87 Difference]: Start difference. First operand 61 states and 69 transitions. Second operand has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:10,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:10,218 INFO L93 Difference]: Finished difference Result 77 states and 86 transitions. [2022-11-25 23:20:10,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-25 23:20:10,219 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 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 [2022-11-25 23:20:10,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:10,219 INFO L225 Difference]: With dead ends: 77 [2022-11-25 23:20:10,219 INFO L226 Difference]: Without dead ends: 77 [2022-11-25 23:20:10,220 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=62, Invalid=120, Unknown=0, NotChecked=0, Total=182 [2022-11-25 23:20:10,220 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 243 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:10,220 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [243 Valid, 84 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:20:10,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-11-25 23:20:10,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 64. [2022-11-25 23:20:10,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 48 states have (on average 1.5) internal successors, (72), 63 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:10,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2022-11-25 23:20:10,223 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 19 [2022-11-25 23:20:10,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:10,223 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2022-11-25 23:20:10,223 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 8 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:10,224 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2022-11-25 23:20:10,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-25 23:20:10,224 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:10,224 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:20:10,224 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-11-25 23:20:10,224 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:20:10,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:10,225 INFO L85 PathProgramCache]: Analyzing trace with hash -694845008, now seen corresponding path program 1 times [2022-11-25 23:20:10,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:10,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [363977038] [2022-11-25 23:20:10,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:10,225 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:10,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:10,859 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:20:10,860 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:10,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [363977038] [2022-11-25 23:20:10,860 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [363977038] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:20:10,860 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:20:10,860 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2022-11-25 23:20:10,860 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607448668] [2022-11-25 23:20:10,860 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:20:10,861 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2022-11-25 23:20:10,861 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:10,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2022-11-25 23:20:10,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=177, Unknown=0, NotChecked=0, Total=210 [2022-11-25 23:20:10,861 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand has 15 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:11,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:11,381 INFO L93 Difference]: Finished difference Result 75 states and 81 transitions. [2022-11-25 23:20:11,381 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-25 23:20:11,381 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-11-25 23:20:11,382 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:11,382 INFO L225 Difference]: With dead ends: 75 [2022-11-25 23:20:11,382 INFO L226 Difference]: Without dead ends: 75 [2022-11-25 23:20:11,383 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=156, Invalid=396, Unknown=0, NotChecked=0, Total=552 [2022-11-25 23:20:11,383 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 333 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 226 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 333 SdHoareTripleChecker+Valid, 203 SdHoareTripleChecker+Invalid, 235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:11,384 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [333 Valid, 203 Invalid, 235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 226 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:20:11,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2022-11-25 23:20:11,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 62. [2022-11-25 23:20:11,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 46 states have (on average 1.4565217391304348) internal successors, (67), 61 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:11,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2022-11-25 23:20:11,386 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 20 [2022-11-25 23:20:11,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:11,386 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2022-11-25 23:20:11,387 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:11,387 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2022-11-25 23:20:11,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-25 23:20:11,387 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:11,387 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:20:11,387 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-11-25 23:20:11,388 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr14ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:20:11,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:11,388 INFO L85 PathProgramCache]: Analyzing trace with hash -709996816, now seen corresponding path program 1 times [2022-11-25 23:20:11,388 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:11,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [233254061] [2022-11-25 23:20:11,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:11,388 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:11,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:11,468 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 23:20:11,469 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:11,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [233254061] [2022-11-25 23:20:11,469 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [233254061] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:20:11,469 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-25 23:20:11,469 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-25 23:20:11,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [491691410] [2022-11-25 23:20:11,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:20:11,470 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 23:20:11,470 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:11,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 23:20:11,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-25 23:20:11,471 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand has 5 states, 4 states have (on average 3.75) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:11,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:11,579 INFO L93 Difference]: Finished difference Result 61 states and 66 transitions. [2022-11-25 23:20:11,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-25 23:20:11,580 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 5 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 20 [2022-11-25 23:20:11,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:11,581 INFO L225 Difference]: With dead ends: 61 [2022-11-25 23:20:11,581 INFO L226 Difference]: Without dead ends: 61 [2022-11-25 23:20:11,581 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2022-11-25 23:20:11,582 INFO L413 NwaCegarLoop]: 27 mSDtfsCounter, 19 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:11,582 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 66 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:20:11,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2022-11-25 23:20:11,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2022-11-25 23:20:11,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 46 states have (on average 1.434782608695652) internal successors, (66), 60 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:11,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 66 transitions. [2022-11-25 23:20:11,585 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 66 transitions. Word has length 20 [2022-11-25 23:20:11,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:11,585 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 66 transitions. [2022-11-25 23:20:11,585 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.75) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:11,586 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 66 transitions. [2022-11-25 23:20:11,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-25 23:20:11,586 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:11,586 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:20:11,587 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2022-11-25 23:20:11,587 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:20:11,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:11,588 INFO L85 PathProgramCache]: Analyzing trace with hash -65355619, now seen corresponding path program 1 times [2022-11-25 23:20:11,588 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:11,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [227910432] [2022-11-25 23:20:11,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:11,588 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:11,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:12,346 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:20:12,347 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:12,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [227910432] [2022-11-25 23:20:12,347 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [227910432] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:20:12,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1207372534] [2022-11-25 23:20:12,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:12,348 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:20:12,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:20:12,349 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:20:12,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-25 23:20:12,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:12,507 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 70 conjunts are in the unsatisfiable core [2022-11-25 23:20:12,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:20:12,541 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-25 23:20:12,664 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-25 23:20:12,665 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 18 [2022-11-25 23:20:12,797 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-25 23:20:12,814 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 13 treesize of output 9 [2022-11-25 23:20:13,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:13,178 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:20:13,179 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 49 [2022-11-25 23:20:13,188 INFO L321 Elim1Store]: treesize reduction 11, result has 8.3 percent of original size [2022-11-25 23:20:13,189 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 45 treesize of output 22 [2022-11-25 23:20:13,212 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:20:13,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:20:13,566 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 130 treesize of output 122 [2022-11-25 23:20:13,736 INFO L321 Elim1Store]: treesize reduction 37, result has 66.7 percent of original size [2022-11-25 23:20:13,736 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 260 treesize of output 287 [2022-11-25 23:20:14,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:14,183 INFO L321 Elim1Store]: treesize reduction 27, result has 57.1 percent of original size [2022-11-25 23:20:14,183 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 4 new quantified variables, introduced 3 case distinctions, treesize of input 284 treesize of output 259 [2022-11-25 23:20:14,376 INFO L321 Elim1Store]: treesize reduction 37, result has 66.7 percent of original size [2022-11-25 23:20:14,377 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 6 new quantified variables, introduced 10 case distinctions, treesize of input 560 treesize of output 535 [2022-11-25 23:20:15,443 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:20:15,444 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1207372534] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:20:15,444 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1912840079] [2022-11-25 23:20:15,446 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-25 23:20:15,447 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:20:15,447 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:20:15,447 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:20:15,447 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:20:15,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,470 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,471 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-25 23:20:15,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,505 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,506 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-25 23:20:15,539 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 13 treesize of output 9 [2022-11-25 23:20:15,549 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 13 treesize of output 9 [2022-11-25 23:20:15,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,563 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 21 [2022-11-25 23:20:15,623 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,625 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:20:15,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,643 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:20:15,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,658 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:20:15,701 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:15,702 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 23 treesize of output 13 [2022-11-25 23:20:15,715 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:15,715 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 23 treesize of output 13 [2022-11-25 23:20:15,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,736 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-25 23:20:15,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,789 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-25 23:20:15,886 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:15,895 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:20:15,896 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 345 treesize of output 327 [2022-11-25 23:20:15,950 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:15,950 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 339 treesize of output 346 [2022-11-25 23:20:16,010 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:16,011 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 333 treesize of output 340 [2022-11-25 23:20:16,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:16,336 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:16,336 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 672 treesize of output 673 [2022-11-25 23:20:16,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:16,416 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:16,417 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 666 treesize of output 667 [2022-11-25 23:20:16,441 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:16,477 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:20:16,478 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 647 treesize of output 628 [2022-11-25 23:20:16,964 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:16,965 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:16,991 INFO L321 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-25 23:20:16,992 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 2 case distinctions, treesize of input 366 treesize of output 359 [2022-11-25 23:20:17,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:17,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:17,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:17,025 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:17,034 INFO L321 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-11-25 23:20:17,035 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 442 treesize of output 427 [2022-11-25 23:20:17,059 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:17,060 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:17,079 INFO L321 Elim1Store]: treesize reduction 51, result has 22.7 percent of original size [2022-11-25 23:20:17,080 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 2 case distinctions, treesize of input 438 treesize of output 431 [2022-11-25 23:20:17,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:17,363 INFO L321 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-25 23:20:17,364 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 463 treesize of output 467 [2022-11-25 23:20:17,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:17,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:17,606 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:20:17,606 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 345 treesize of output 327 [2022-11-25 23:20:17,656 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:17,657 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 339 treesize of output 346 [2022-11-25 23:20:17,714 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:17,715 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 333 treesize of output 340 [2022-11-25 23:20:17,899 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:17,947 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:20:17,948 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 353 treesize of output 354 [2022-11-25 23:20:17,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:18,026 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:18,027 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 362 treesize of output 363 [2022-11-25 23:20:18,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:18,102 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:18,102 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 356 treesize of output 357 [2022-11-25 23:20:18,512 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:18,514 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:18,537 INFO L321 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-25 23:20:18,537 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 2 case distinctions, treesize of input 368 treesize of output 361 [2022-11-25 23:20:18,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:18,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:18,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:18,568 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:18,577 INFO L321 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-11-25 23:20:18,577 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 450 treesize of output 435 [2022-11-25 23:20:18,601 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:18,602 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:18,621 INFO L321 Elim1Store]: treesize reduction 51, result has 22.7 percent of original size [2022-11-25 23:20:18,621 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 2 case distinctions, treesize of input 446 treesize of output 439 [2022-11-25 23:20:19,024 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 9 [2022-11-25 23:20:19,030 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 6 treesize of output 5 [2022-11-25 23:20:19,034 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:20:24,935 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3004#(and (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.offset|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.offset|) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (or (not (<= (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 8) (select |#length| |ULTIMATE.start_sll_remove_last_~last~0#1.base|))) (not (<= 0 (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 4)))) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) (<= |ULTIMATE.start_main_~i~0#1| 1) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.base|))' at error location [2022-11-25 23:20:24,936 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:20:24,936 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:20:24,936 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 31 [2022-11-25 23:20:24,936 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2126976804] [2022-11-25 23:20:24,936 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:20:24,936 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-11-25 23:20:24,937 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:24,937 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-11-25 23:20:24,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=1790, Unknown=0, NotChecked=0, Total=1980 [2022-11-25 23:20:24,939 INFO L87 Difference]: Start difference. First operand 61 states and 66 transitions. Second operand has 32 states, 31 states have (on average 1.967741935483871) internal successors, (61), 32 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:27,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:27,248 INFO L93 Difference]: Finished difference Result 122 states and 132 transitions. [2022-11-25 23:20:27,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-25 23:20:27,249 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 1.967741935483871) internal successors, (61), 32 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 21 [2022-11-25 23:20:27,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:27,250 INFO L225 Difference]: With dead ends: 122 [2022-11-25 23:20:27,250 INFO L226 Difference]: Without dead ends: 122 [2022-11-25 23:20:27,252 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 604 ImplicationChecksByTransitivity, 8.7s TimeCoverageRelationStatistics Valid=568, Invalid=2972, Unknown=0, NotChecked=0, Total=3540 [2022-11-25 23:20:27,252 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 1545 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 463 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1545 SdHoareTripleChecker+Valid, 208 SdHoareTripleChecker+Invalid, 488 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 463 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:27,253 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1545 Valid, 208 Invalid, 488 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 463 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-25 23:20:27,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-11-25 23:20:27,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 64. [2022-11-25 23:20:27,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 50 states have (on average 1.46) internal successors, (73), 63 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:27,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 73 transitions. [2022-11-25 23:20:27,256 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 73 transitions. Word has length 21 [2022-11-25 23:20:27,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:27,256 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 73 transitions. [2022-11-25 23:20:27,256 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 1.967741935483871) internal successors, (61), 32 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:27,257 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 73 transitions. [2022-11-25 23:20:27,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-25 23:20:27,257 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:27,257 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:20:27,264 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-11-25 23:20:27,463 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-25 23:20:27,464 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr19REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:20:27,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:27,465 INFO L85 PathProgramCache]: Analyzing trace with hash -65355620, now seen corresponding path program 1 times [2022-11-25 23:20:27,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:27,465 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638731817] [2022-11-25 23:20:27,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:27,465 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:27,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:28,118 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:20:28,119 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:28,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638731817] [2022-11-25 23:20:28,119 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638731817] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:20:28,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2041193856] [2022-11-25 23:20:28,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:28,119 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:20:28,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:20:28,121 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:20:28,123 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-25 23:20:28,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:28,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 53 conjunts are in the unsatisfiable core [2022-11-25 23:20:28,268 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:20:28,329 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-25 23:20:28,350 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:20:28,353 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 17 treesize of output 21 [2022-11-25 23:20:28,457 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 13 treesize of output 9 [2022-11-25 23:20:28,678 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-25 23:20:28,743 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-25 23:20:28,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:28,834 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:28,836 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:20:28,836 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 47 treesize of output 19 [2022-11-25 23:20:28,840 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:20:28,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:20:29,024 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 43 treesize of output 31 [2022-11-25 23:20:29,127 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:20:29,128 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 4 new quantified variables, introduced 3 case distinctions, treesize of input 206 treesize of output 212 [2022-11-25 23:20:30,018 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:20:30,019 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 1 [2022-11-25 23:20:30,020 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:20:30,020 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2041193856] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:20:30,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [956742844] [2022-11-25 23:20:30,023 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-25 23:20:30,023 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:20:30,024 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:20:30,024 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:20:30,024 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:20:30,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,056 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,057 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-25 23:20:30,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,090 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-25 23:20:30,121 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 13 treesize of output 9 [2022-11-25 23:20:30,131 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 13 treesize of output 9 [2022-11-25 23:20:30,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,145 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 21 [2022-11-25 23:20:30,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,173 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:20:30,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,190 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:20:30,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,206 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:20:30,247 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:30,248 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 23 treesize of output 13 [2022-11-25 23:20:30,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,266 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-25 23:20:30,281 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:30,282 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 23 treesize of output 13 [2022-11-25 23:20:30,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,321 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,322 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,324 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,328 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,332 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-25 23:20:30,485 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:30,486 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 339 treesize of output 346 [2022-11-25 23:20:30,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,518 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:20:30,518 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 339 treesize of output 321 [2022-11-25 23:20:30,571 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:30,572 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 333 treesize of output 340 [2022-11-25 23:20:30,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:30,900 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:30,901 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 672 treesize of output 673 [2022-11-25 23:20:30,928 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:30,960 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:20:30,960 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 653 treesize of output 634 [2022-11-25 23:20:30,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:31,027 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:31,027 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 658 treesize of output 659 [2022-11-25 23:20:31,480 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:31,481 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:31,504 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:20:31,504 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 2 case distinctions, treesize of input 348 treesize of output 341 [2022-11-25 23:20:31,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:31,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:31,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:31,548 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:31,557 INFO L321 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-11-25 23:20:31,557 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 418 treesize of output 403 [2022-11-25 23:20:31,580 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:31,581 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:31,606 INFO L321 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2022-11-25 23:20:31,607 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 2 case distinctions, treesize of input 414 treesize of output 407 [2022-11-25 23:20:31,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:31,873 INFO L321 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-25 23:20:31,874 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 415 treesize of output 419 [2022-11-25 23:20:32,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:32,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:32,082 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:20:32,083 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 345 treesize of output 327 [2022-11-25 23:20:32,130 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:32,130 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 339 treesize of output 346 [2022-11-25 23:20:32,187 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:32,188 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 333 treesize of output 340 [2022-11-25 23:20:32,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:32,383 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:32,383 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 366 treesize of output 367 [2022-11-25 23:20:32,417 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:32,453 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:20:32,454 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 347 treesize of output 348 [2022-11-25 23:20:32,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:32,520 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:32,520 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 356 treesize of output 357 [2022-11-25 23:20:32,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:32,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:32,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:32,881 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:32,889 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-25 23:20:32,889 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 356 treesize of output 341 [2022-11-25 23:20:32,911 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:32,912 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:32,928 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:20:32,928 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 2 case distinctions, treesize of input 352 treesize of output 345 [2022-11-25 23:20:32,954 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:32,955 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:32,975 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:20:32,975 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 364 treesize of output 357 [2022-11-25 23:20:33,447 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 9 [2022-11-25 23:20:33,457 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 6 treesize of output 5 [2022-11-25 23:20:33,462 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:20:38,961 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3382#(and (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.offset|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.offset|) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (= |#NULL.offset| 0) (<= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) (<= |ULTIMATE.start_main_~i~0#1| 1) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0) (not (= (select |#valid| |ULTIMATE.start_sll_remove_last_~last~0#1.base|) 1)) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.base|))' at error location [2022-11-25 23:20:38,961 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:20:38,962 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:20:38,962 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 28 [2022-11-25 23:20:38,962 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883569414] [2022-11-25 23:20:38,962 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:20:38,962 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-11-25 23:20:38,963 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:38,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-11-25 23:20:38,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=1558, Unknown=0, NotChecked=0, Total=1722 [2022-11-25 23:20:38,964 INFO L87 Difference]: Start difference. First operand 64 states and 73 transitions. Second operand has 29 states, 28 states have (on average 2.142857142857143) internal successors, (60), 29 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:42,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:42,095 INFO L93 Difference]: Finished difference Result 82 states and 91 transitions. [2022-11-25 23:20:42,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-25 23:20:42,095 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.142857142857143) internal successors, (60), 29 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-11-25 23:20:42,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:42,096 INFO L225 Difference]: With dead ends: 82 [2022-11-25 23:20:42,096 INFO L226 Difference]: Without dead ends: 82 [2022-11-25 23:20:42,097 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 8.4s TimeCoverageRelationStatistics Valid=452, Invalid=2740, Unknown=0, NotChecked=0, Total=3192 [2022-11-25 23:20:42,098 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 405 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 793 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 405 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 813 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 793 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:42,098 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [405 Valid, 239 Invalid, 813 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 793 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-25 23:20:42,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-11-25 23:20:42,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 64. [2022-11-25 23:20:42,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 50 states have (on average 1.44) internal successors, (72), 63 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:42,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2022-11-25 23:20:42,101 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 21 [2022-11-25 23:20:42,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:42,101 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2022-11-25 23:20:42,101 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.142857142857143) internal successors, (60), 29 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:42,101 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2022-11-25 23:20:42,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-11-25 23:20:42,102 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:42,102 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:20:42,110 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-11-25 23:20:42,308 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:20:42,308 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr15REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:20:42,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:42,309 INFO L85 PathProgramCache]: Analyzing trace with hash -535064719, now seen corresponding path program 1 times [2022-11-25 23:20:42,309 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:42,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [728609667] [2022-11-25 23:20:42,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:42,310 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:42,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:42,576 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:20:42,576 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:42,576 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [728609667] [2022-11-25 23:20:42,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [728609667] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:20:42,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1825449804] [2022-11-25 23:20:42,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:42,577 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:20:42,577 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:20:42,578 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:20:42,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-25 23:20:42,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:42,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-25 23:20:42,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:20:42,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:42,862 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 14 [2022-11-25 23:20:42,865 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 23:20:42,865 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-25 23:20:42,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1825449804] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-25 23:20:42,865 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-25 23:20:42,866 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [9] total 12 [2022-11-25 23:20:42,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1357055195] [2022-11-25 23:20:42,866 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-25 23:20:42,866 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-25 23:20:42,866 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:42,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-25 23:20:42,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=150, Unknown=0, NotChecked=0, Total=182 [2022-11-25 23:20:42,867 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:43,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:43,003 INFO L93 Difference]: Finished difference Result 70 states and 79 transitions. [2022-11-25 23:20:43,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-25 23:20:43,004 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-11-25 23:20:43,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:43,004 INFO L225 Difference]: With dead ends: 70 [2022-11-25 23:20:43,004 INFO L226 Difference]: Without dead ends: 70 [2022-11-25 23:20:43,005 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=53, Invalid=219, Unknown=0, NotChecked=0, Total=272 [2022-11-25 23:20:43,005 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 105 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:43,006 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 36 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:20:43,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-25 23:20:43,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 63. [2022-11-25 23:20:43,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 50 states have (on average 1.42) internal successors, (71), 62 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:43,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2022-11-25 23:20:43,008 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 21 [2022-11-25 23:20:43,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:43,008 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2022-11-25 23:20:43,008 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 6 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:43,009 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2022-11-25 23:20:43,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-25 23:20:43,009 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:43,009 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:20:43,026 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-25 23:20:43,221 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:20:43,221 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr23REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:20:43,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:43,222 INFO L85 PathProgramCache]: Analyzing trace with hash 1617760326, now seen corresponding path program 1 times [2022-11-25 23:20:43,222 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:43,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387024370] [2022-11-25 23:20:43,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:43,222 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:43,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:43,323 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 23:20:43,323 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:43,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387024370] [2022-11-25 23:20:43,324 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [387024370] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:20:43,324 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [405913312] [2022-11-25 23:20:43,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:43,324 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:20:43,325 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:20:43,326 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:20:43,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-25 23:20:43,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:43,505 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 7 conjunts are in the unsatisfiable core [2022-11-25 23:20:43,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:20:43,515 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 7 treesize of output 3 [2022-11-25 23:20:43,525 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 23:20:43,525 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:20:43,535 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 23:20:43,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [405913312] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:20:43,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [391911825] [2022-11-25 23:20:43,539 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-25 23:20:43,539 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:20:43,540 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:20:43,540 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:20:43,540 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:20:43,560 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,561 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,562 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-25 23:20:43,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,593 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,594 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-25 23:20:43,625 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 13 treesize of output 9 [2022-11-25 23:20:43,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,636 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 21 [2022-11-25 23:20:43,651 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 13 treesize of output 9 [2022-11-25 23:20:43,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,675 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:20:43,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,690 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:20:43,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,710 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:20:43,740 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:43,741 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 23 treesize of output 13 [2022-11-25 23:20:43,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,760 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-25 23:20:43,781 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:43,782 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 23 treesize of output 13 [2022-11-25 23:20:43,843 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,857 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-25 23:20:43,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:43,962 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:20:43,962 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 352 treesize of output 334 [2022-11-25 23:20:44,009 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:44,010 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 346 treesize of output 353 [2022-11-25 23:20:44,072 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:44,073 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 340 treesize of output 347 [2022-11-25 23:20:44,245 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:44,284 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:20:44,285 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 360 treesize of output 361 [2022-11-25 23:20:44,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:44,356 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:44,357 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 369 treesize of output 370 [2022-11-25 23:20:44,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:44,414 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:44,414 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 363 treesize of output 364 [2022-11-25 23:20:44,859 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:44,860 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:44,879 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:20:44,880 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 2 case distinctions, treesize of input 352 treesize of output 345 [2022-11-25 23:20:44,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:44,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:44,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:44,906 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:44,915 INFO L321 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-11-25 23:20:44,915 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 428 treesize of output 413 [2022-11-25 23:20:44,937 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:44,938 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:44,955 INFO L321 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2022-11-25 23:20:44,956 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 2 case distinctions, treesize of input 424 treesize of output 417 [2022-11-25 23:20:45,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:45,194 INFO L321 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-25 23:20:45,195 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 425 treesize of output 429 [2022-11-25 23:20:45,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:45,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:45,376 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:20:45,376 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 352 treesize of output 334 [2022-11-25 23:20:45,425 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:45,425 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 346 treesize of output 353 [2022-11-25 23:20:45,467 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:45,468 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 340 treesize of output 347 [2022-11-25 23:20:45,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:45,769 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:45,769 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 686 treesize of output 687 [2022-11-25 23:20:45,798 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:45,829 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:20:45,830 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 667 treesize of output 648 [2022-11-25 23:20:45,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:45,905 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:45,906 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 672 treesize of output 673 [2022-11-25 23:20:46,267 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:46,268 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:46,287 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:20:46,288 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 2 case distinctions, treesize of input 352 treesize of output 345 [2022-11-25 23:20:46,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:46,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:46,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:46,320 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:46,328 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-25 23:20:46,329 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 368 treesize of output 353 [2022-11-25 23:20:46,364 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:46,368 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:46,383 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:20:46,384 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 2 case distinctions, treesize of input 364 treesize of output 357 [2022-11-25 23:20:46,766 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 9 [2022-11-25 23:20:46,773 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 6 treesize of output 5 [2022-11-25 23:20:46,777 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:20:51,631 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3922#(and (not (= (select |#valid| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|) 1)) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.offset|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.offset|) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (= |#NULL.offset| 0) (<= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 4)) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) (<= |ULTIMATE.start_main_~i~0#1| 1) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.base|))' at error location [2022-11-25 23:20:51,631 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:20:51,631 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:20:51,631 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 3, 3] total 5 [2022-11-25 23:20:51,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1116958737] [2022-11-25 23:20:51,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:20:51,632 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-25 23:20:51,632 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:20:51,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-25 23:20:51,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2022-11-25 23:20:51,632 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand has 6 states, 5 states have (on average 4.6) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:51,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:20:51,781 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2022-11-25 23:20:51,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-25 23:20:51,782 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 4.6) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-11-25 23:20:51,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:20:51,782 INFO L225 Difference]: With dead ends: 67 [2022-11-25 23:20:51,782 INFO L226 Difference]: Without dead ends: 67 [2022-11-25 23:20:51,783 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=92, Invalid=460, Unknown=0, NotChecked=0, Total=552 [2022-11-25 23:20:51,784 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 42 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 131 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:20:51,784 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 57 Invalid, 131 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:20:51,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-11-25 23:20:51,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 65. [2022-11-25 23:20:51,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 52 states have (on average 1.4230769230769231) internal successors, (74), 64 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:51,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 74 transitions. [2022-11-25 23:20:51,787 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 74 transitions. Word has length 23 [2022-11-25 23:20:51,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:20:51,788 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 74 transitions. [2022-11-25 23:20:51,788 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 4.6) internal successors, (23), 6 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:20:51,788 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 74 transitions. [2022-11-25 23:20:51,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-25 23:20:51,789 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:20:51,789 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:20:51,795 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-25 23:20:51,995 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:20:51,996 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr24REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:20:51,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:20:51,996 INFO L85 PathProgramCache]: Analyzing trace with hash 1617760327, now seen corresponding path program 1 times [2022-11-25 23:20:51,996 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:20:51,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [298150396] [2022-11-25 23:20:51,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:51,997 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:20:52,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:52,351 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-25 23:20:52,351 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:20:52,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [298150396] [2022-11-25 23:20:52,351 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [298150396] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:20:52,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1127471095] [2022-11-25 23:20:52,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:20:52,351 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:20:52,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:20:52,359 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:20:52,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-25 23:20:52,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:20:52,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 9 conjunts are in the unsatisfiable core [2022-11-25 23:20:52,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:20:52,553 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 7 treesize of output 3 [2022-11-25 23:20:52,623 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 23:20:52,623 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:20:52,646 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 23:20:52,646 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1127471095] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:20:52,646 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1222222882] [2022-11-25 23:20:52,648 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-25 23:20:52,648 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:20:52,648 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:20:52,648 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:20:52,648 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:20:52,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,671 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-25 23:20:52,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,698 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,703 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-25 23:20:52,734 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 13 treesize of output 9 [2022-11-25 23:20:52,743 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 13 treesize of output 9 [2022-11-25 23:20:52,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,761 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 21 [2022-11-25 23:20:52,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,788 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:20:52,802 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,804 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:20:52,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,820 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:20:52,859 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:52,860 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 23 treesize of output 13 [2022-11-25 23:20:52,872 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:52,873 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 23 treesize of output 13 [2022-11-25 23:20:52,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,893 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-25 23:20:52,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,933 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:52,944 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-25 23:20:53,085 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:53,086 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 346 treesize of output 353 [2022-11-25 23:20:53,152 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:53,153 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 340 treesize of output 347 [2022-11-25 23:20:53,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:53,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:53,187 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:20:53,188 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 340 treesize of output 322 [2022-11-25 23:20:53,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:53,537 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:53,538 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 686 treesize of output 687 [2022-11-25 23:20:53,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:53,610 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:53,611 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 680 treesize of output 681 [2022-11-25 23:20:53,640 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:53,682 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:20:53,683 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 661 treesize of output 642 [2022-11-25 23:20:54,269 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:54,270 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:54,294 INFO L321 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-25 23:20:54,295 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 2 case distinctions, treesize of input 373 treesize of output 366 [2022-11-25 23:20:54,324 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:54,325 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:54,350 INFO L321 Elim1Store]: treesize reduction 33, result has 31.3 percent of original size [2022-11-25 23:20:54,351 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 2 case distinctions, treesize of input 415 treesize of output 408 [2022-11-25 23:20:54,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:54,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:54,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:54,382 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:54,391 INFO L321 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-11-25 23:20:54,392 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 497 treesize of output 482 [2022-11-25 23:20:54,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:54,639 INFO L321 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-25 23:20:54,639 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 482 treesize of output 478 [2022-11-25 23:20:54,917 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:54,918 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 346 treesize of output 353 [2022-11-25 23:20:54,966 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:20:54,966 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 340 treesize of output 347 [2022-11-25 23:20:54,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:54,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:54,999 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:20:55,000 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 340 treesize of output 322 [2022-11-25 23:20:55,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:55,253 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:55,254 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 686 treesize of output 687 [2022-11-25 23:20:55,278 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:55,309 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:20:55,310 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 667 treesize of output 648 [2022-11-25 23:20:55,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:55,376 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:20:55,377 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 672 treesize of output 673 [2022-11-25 23:20:55,861 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:55,862 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:55,882 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:20:55,883 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 2 case distinctions, treesize of input 352 treesize of output 345 [2022-11-25 23:20:55,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:55,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:55,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:20:55,915 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:55,923 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-25 23:20:55,924 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 368 treesize of output 353 [2022-11-25 23:20:55,946 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:55,947 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:20:55,965 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:20:55,965 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 2 case distinctions, treesize of input 364 treesize of output 357 [2022-11-25 23:20:56,415 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 9 [2022-11-25 23:20:56,423 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 6 treesize of output 5 [2022-11-25 23:20:56,426 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:21:01,448 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4221#(and (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.offset|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.offset|) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (= |#NULL.offset| 0) (<= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 4)) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) (<= |ULTIMATE.start_main_~i~0#1| 1) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (< (select |#length| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|) (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 8)) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.base|))' at error location [2022-11-25 23:21:01,449 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:21:01,449 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:21:01,449 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 3, 3] total 10 [2022-11-25 23:21:01,449 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628689978] [2022-11-25 23:21:01,449 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:21:01,449 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-25 23:21:01,450 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:21:01,450 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-25 23:21:01,450 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=472, Unknown=0, NotChecked=0, Total=552 [2022-11-25 23:21:01,451 INFO L87 Difference]: Start difference. First operand 65 states and 74 transitions. Second operand has 11 states, 10 states have (on average 3.5) internal successors, (35), 11 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:21:02,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:21:02,184 INFO L93 Difference]: Finished difference Result 95 states and 102 transitions. [2022-11-25 23:21:02,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-11-25 23:21:02,185 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 3.5) internal successors, (35), 11 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) Word has length 23 [2022-11-25 23:21:02,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:21:02,185 INFO L225 Difference]: With dead ends: 95 [2022-11-25 23:21:02,185 INFO L226 Difference]: Without dead ends: 95 [2022-11-25 23:21:02,186 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 283 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=253, Invalid=1153, Unknown=0, NotChecked=0, Total=1406 [2022-11-25 23:21:02,187 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 317 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 263 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 317 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 263 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-25 23:21:02,187 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [317 Valid, 127 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 263 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-25 23:21:02,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-11-25 23:21:02,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 65. [2022-11-25 23:21:02,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 52 states have (on average 1.3846153846153846) internal successors, (72), 64 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:21:02,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 72 transitions. [2022-11-25 23:21:02,190 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 72 transitions. Word has length 23 [2022-11-25 23:21:02,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:21:02,190 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 72 transitions. [2022-11-25 23:21:02,190 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 3.5) internal successors, (35), 11 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:21:02,191 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 72 transitions. [2022-11-25 23:21:02,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-25 23:21:02,191 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:21:02,191 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:21:02,202 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-11-25 23:21:02,397 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:21:02,398 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:21:02,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:21:02,398 INFO L85 PathProgramCache]: Analyzing trace with hash -1389034297, now seen corresponding path program 2 times [2022-11-25 23:21:02,398 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:21:02,398 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1468929339] [2022-11-25 23:21:02,398 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:21:02,399 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:21:02,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:21:03,682 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:21:03,682 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:21:03,682 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1468929339] [2022-11-25 23:21:03,683 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1468929339] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:21:03,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1953838425] [2022-11-25 23:21:03,683 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-25 23:21:03,683 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:21:03,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:21:03,687 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:21:03,718 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-25 23:21:03,911 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-25 23:21:03,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:21:03,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 94 conjunts are in the unsatisfiable core [2022-11-25 23:21:03,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:21:03,961 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-25 23:21:04,071 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-25 23:21:04,078 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-25 23:21:04,137 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-25 23:21:04,137 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2022-11-25 23:21:04,201 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 16 treesize of output 18 [2022-11-25 23:21:04,209 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 16 treesize of output 18 [2022-11-25 23:21:04,233 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 16 treesize of output 18 [2022-11-25 23:21:04,245 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 16 treesize of output 18 [2022-11-25 23:21:04,296 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2022-11-25 23:21:04,302 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 27 treesize of output 26 [2022-11-25 23:21:04,871 INFO L321 Elim1Store]: treesize reduction 74, result has 3.9 percent of original size [2022-11-25 23:21:04,871 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 6 new quantified variables, introduced 6 case distinctions, treesize of input 125 treesize of output 56 [2022-11-25 23:21:04,970 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:21:04,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:21:05,702 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:21:05,702 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 110 treesize of output 98 [2022-11-25 23:21:05,710 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:21:05,711 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 95 treesize of output 78 [2022-11-25 23:21:05,740 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:21:05,741 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 110 treesize of output 93 [2022-11-25 23:21:05,749 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:21:05,749 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 90 treesize of output 78 [2022-11-25 23:21:05,771 WARN L837 $PredicateComparison]: unable to prove that (and (forall ((v_arrayElimArr_4 (Array Int Int)) (v_arrayElimArr_3 (Array Int Int)) (|ULTIMATE.start_main_~#s~0#1.base| Int)) (let ((.cse3 (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_node_create_~temp~0#1.base| v_arrayElimArr_4)) (.cse2 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_node_create_~temp~0#1.base| v_arrayElimArr_3))) (let ((.cse0 (select (select .cse2 |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)) (.cse1 (+ (select (select .cse3 |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 4))) (or (not (= |c_ULTIMATE.start_node_create_~temp~0#1.base| .cse0)) (not (= (select v_arrayElimArr_4 .cse1) |c_ULTIMATE.start_sll_create_~head~0#1.offset|)) (= (select (select .cse2 (select (select .cse2 .cse0) .cse1)) (+ (select (select .cse3 .cse0) .cse1) 4)) 0) (not (= |c_ULTIMATE.start_sll_create_~head~0#1.base| (select v_arrayElimArr_3 .cse1))))))) (forall ((v_arrayElimArr_2 (Array Int Int)) (v_arrayElimArr_1 (Array Int Int)) (|ULTIMATE.start_main_~#s~0#1.base| Int)) (let ((.cse6 (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_node_create_~temp~0#1.base| v_arrayElimArr_2)) (.cse7 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_node_create_~temp~0#1.base| v_arrayElimArr_1))) (let ((.cse4 (select (select .cse7 |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)) (.cse5 (+ (select (select .cse6 |ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 4))) (or (not (= |c_ULTIMATE.start_node_create_~temp~0#1.base| .cse4)) (not (= (select v_arrayElimArr_1 .cse5) |c_ULTIMATE.start_sll_create_~head~0#1.base|)) (= (select (select .cse6 (select (select .cse7 .cse4) .cse5)) (+ (select (select .cse6 .cse4) .cse5) 4)) 0) (not (= (select v_arrayElimArr_2 .cse5) |c_ULTIMATE.start_sll_create_~head~0#1.offset|))))))) is different from false [2022-11-25 23:21:06,100 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:21:06,100 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 150 treesize of output 120 [2022-11-25 23:21:06,109 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:21:06,109 INFO L350 Elim1Store]: Elim1 eliminated variable 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 149 treesize of output 99 [2022-11-25 23:21:06,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:06,187 INFO L321 Elim1Store]: treesize reduction 50, result has 66.0 percent of original size [2022-11-25 23:21:06,187 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 6 new quantified variables, introduced 6 case distinctions, treesize of input 278 treesize of output 314 [2022-11-25 23:21:06,435 INFO L321 Elim1Store]: treesize reduction 58, result has 70.4 percent of original size [2022-11-25 23:21:06,436 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 7 new quantified variables, introduced 15 case distinctions, treesize of input 876 treesize of output 783 [2022-11-25 23:21:06,498 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:21:06,498 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 746 treesize of output 682 [2022-11-25 23:21:06,599 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:21:06,599 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 8 new quantified variables, introduced 10 case distinctions, treesize of input 657 treesize of output 701 [2022-11-25 23:21:18,215 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:21:18,216 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 150 treesize of output 110 [2022-11-25 23:21:18,230 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:21:18,230 INFO L350 Elim1Store]: Elim1 eliminated variable 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 139 treesize of output 99 [2022-11-25 23:21:18,884 INFO L321 Elim1Store]: treesize reduction 256, result has 65.6 percent of original size [2022-11-25 23:21:18,884 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 12 new quantified variables, introduced 28 case distinctions, treesize of input 498 treesize of output 764 [2022-11-25 23:21:19,301 INFO L321 Elim1Store]: treesize reduction 60, result has 70.6 percent of original size [2022-11-25 23:21:19,301 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 7 new quantified variables, introduced 15 case distinctions, treesize of input 2193 treesize of output 1770 [2022-11-25 23:21:19,467 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:21:19,468 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 4 new quantified variables, introduced 3 case distinctions, treesize of input 1650 treesize of output 1470 [2022-11-25 23:21:20,547 INFO L321 Elim1Store]: treesize reduction 8, result has 97.5 percent of original size [2022-11-25 23:21:20,548 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 36 case distinctions, treesize of input 1316 treesize of output 1440 [2022-11-25 23:21:54,666 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 3 not checked. [2022-11-25 23:21:54,667 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1953838425] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:21:54,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1203208554] [2022-11-25 23:21:54,670 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2022-11-25 23:21:54,670 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:21:54,671 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:21:54,671 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:21:54,671 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:21:54,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:54,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:54,693 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-25 23:21:54,726 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:54,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:54,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:54,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:54,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:54,734 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-25 23:21:54,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:54,769 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 21 [2022-11-25 23:21:54,785 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 13 treesize of output 9 [2022-11-25 23:21:54,797 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 13 treesize of output 9 [2022-11-25 23:21:54,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:54,836 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:21:54,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:54,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:54,854 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:21:54,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:54,879 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:21:54,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:54,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:54,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:54,922 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-25 23:21:54,942 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:21:54,943 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 23 treesize of output 13 [2022-11-25 23:21:54,966 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:21:54,967 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 23 treesize of output 13 [2022-11-25 23:21:55,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:55,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:55,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:55,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:55,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:55,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:55,049 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:55,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:55,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:55,054 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-25 23:21:55,216 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:21:55,217 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 346 treesize of output 353 [2022-11-25 23:21:55,280 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:21:55,281 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 340 treesize of output 347 [2022-11-25 23:21:55,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:55,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:55,315 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:21:55,316 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 340 treesize of output 322 [2022-11-25 23:21:55,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:55,625 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:21:55,626 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 686 treesize of output 687 [2022-11-25 23:21:55,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:55,695 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:21:55,695 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 680 treesize of output 681 [2022-11-25 23:21:55,732 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:21:55,777 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:21:55,778 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 661 treesize of output 642 [2022-11-25 23:21:56,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:56,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:56,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:56,287 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:21:56,297 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-25 23:21:56,297 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 352 treesize of output 337 [2022-11-25 23:21:56,324 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:21:56,325 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:21:56,347 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:21:56,348 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 2 case distinctions, treesize of input 348 treesize of output 341 [2022-11-25 23:21:56,372 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:21:56,374 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:21:56,394 INFO L321 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2022-11-25 23:21:56,395 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 2 case distinctions, treesize of input 414 treesize of output 407 [2022-11-25 23:21:56,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:56,606 INFO L321 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-25 23:21:56,607 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 415 treesize of output 419 [2022-11-25 23:21:56,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:56,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:56,819 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:21:56,819 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 352 treesize of output 334 [2022-11-25 23:21:56,871 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:21:56,871 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 346 treesize of output 353 [2022-11-25 23:21:56,930 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:21:56,931 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 340 treesize of output 347 [2022-11-25 23:21:57,414 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:21:57,463 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:21:57,464 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 1183 treesize of output 1132 [2022-11-25 23:21:57,512 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:57,555 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:21:57,555 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 1180 treesize of output 1175 [2022-11-25 23:21:57,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:57,632 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:21:57,633 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 1168 treesize of output 1163 [2022-11-25 23:21:58,332 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:21:58,333 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:21:58,358 INFO L321 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-25 23:21:58,359 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 2 case distinctions, treesize of input 365 treesize of output 358 [2022-11-25 23:21:58,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:58,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:58,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:21:58,402 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:21:58,411 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-25 23:21:58,412 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 405 treesize of output 390 [2022-11-25 23:21:58,434 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:21:58,435 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:21:58,456 INFO L321 Elim1Store]: treesize reduction 33, result has 31.3 percent of original size [2022-11-25 23:21:58,457 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 2 case distinctions, treesize of input 401 treesize of output 394 [2022-11-25 23:21:58,895 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 9 [2022-11-25 23:21:58,905 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 6 treesize of output 5 [2022-11-25 23:21:58,910 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:22:06,531 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4602#(and (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.offset|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.offset|) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (or (not (<= (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 8) (select |#length| |ULTIMATE.start_sll_remove_last_~last~0#1.base|))) (not (<= 0 (+ |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 4)))) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |#NULL.offset| 0) (<= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) (<= |ULTIMATE.start_main_~i~0#1| 1) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.base|))' at error location [2022-11-25 23:22:06,531 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:22:06,531 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:22:06,532 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 13] total 38 [2022-11-25 23:22:06,532 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233655736] [2022-11-25 23:22:06,532 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:22:06,532 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-11-25 23:22:06,532 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:22:06,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-11-25 23:22:06,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=2391, Unknown=1, NotChecked=98, Total=2652 [2022-11-25 23:22:06,534 INFO L87 Difference]: Start difference. First operand 65 states and 72 transitions. Second operand has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 38 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:22:09,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:22:09,985 INFO L93 Difference]: Finished difference Result 134 states and 147 transitions. [2022-11-25 23:22:09,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-25 23:22:09,988 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 38 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-11-25 23:22:09,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:22:09,991 INFO L225 Difference]: With dead ends: 134 [2022-11-25 23:22:09,991 INFO L226 Difference]: Without dead ends: 134 [2022-11-25 23:22:09,992 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 798 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=306, Invalid=3479, Unknown=1, NotChecked=120, Total=3906 [2022-11-25 23:22:09,993 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 180 mSDsluCounter, 596 mSDsCounter, 0 mSdLazyCounter, 973 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 180 SdHoareTripleChecker+Valid, 625 SdHoareTripleChecker+Invalid, 1075 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 973 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 93 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:22:09,993 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [180 Valid, 625 Invalid, 1075 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 973 Invalid, 0 Unknown, 93 Unchecked, 1.4s Time] [2022-11-25 23:22:09,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2022-11-25 23:22:10,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 80. [2022-11-25 23:22:10,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 67 states have (on average 1.328358208955224) internal successors, (89), 79 states have internal predecessors, (89), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:22:10,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 89 transitions. [2022-11-25 23:22:10,001 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 89 transitions. Word has length 24 [2022-11-25 23:22:10,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:22:10,001 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 89 transitions. [2022-11-25 23:22:10,002 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.7179487179487178) internal successors, (67), 38 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:22:10,002 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 89 transitions. [2022-11-25 23:22:10,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-25 23:22:10,002 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:22:10,003 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:22:10,023 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-25 23:22:10,215 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-25 23:22:10,216 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr28REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:22:10,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:22:10,216 INFO L85 PathProgramCache]: Analyzing trace with hash -1489311660, now seen corresponding path program 1 times [2022-11-25 23:22:10,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:22:10,216 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2052668098] [2022-11-25 23:22:10,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:22:10,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:22:10,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:22:10,301 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 23:22:10,301 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:22:10,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2052668098] [2022-11-25 23:22:10,302 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2052668098] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:22:10,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [176669315] [2022-11-25 23:22:10,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:22:10,303 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:22:10,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:22:10,304 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:22:10,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-25 23:22:10,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:22:10,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-25 23:22:10,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:22:10,599 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 23:22:10,600 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:22:10,659 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 23:22:10,659 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [176669315] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:22:10,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [588244918] [2022-11-25 23:22:10,663 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-25 23:22:10,664 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:22:10,665 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:22:10,665 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:22:10,666 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:22:10,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,691 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-25 23:22:10,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,726 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,732 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-25 23:22:10,766 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 13 treesize of output 9 [2022-11-25 23:22:10,777 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 13 treesize of output 9 [2022-11-25 23:22:10,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,795 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 21 [2022-11-25 23:22:10,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,826 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:22:10,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,848 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:22:10,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,867 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:22:10,899 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:10,900 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 23 treesize of output 13 [2022-11-25 23:22:10,915 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:10,916 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 23 treesize of output 13 [2022-11-25 23:22:10,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,937 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-25 23:22:10,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,975 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,977 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:10,984 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-25 23:22:11,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:11,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:11,083 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:22:11,084 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 352 treesize of output 334 [2022-11-25 23:22:11,138 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:22:11,138 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 346 treesize of output 353 [2022-11-25 23:22:11,206 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:22:11,206 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 340 treesize of output 347 [2022-11-25 23:22:11,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:11,531 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:22:11,532 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 686 treesize of output 687 [2022-11-25 23:22:11,563 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:11,604 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:22:11,606 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 667 treesize of output 648 [2022-11-25 23:22:11,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:11,678 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:22:11,679 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 672 treesize of output 673 [2022-11-25 23:22:12,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:12,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:12,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:12,257 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:12,267 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-25 23:22:12,268 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 371 treesize of output 356 [2022-11-25 23:22:12,292 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:12,293 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:12,313 INFO L321 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-25 23:22:12,314 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 2 case distinctions, treesize of input 367 treesize of output 360 [2022-11-25 23:22:12,339 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:12,340 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:12,360 INFO L321 Elim1Store]: treesize reduction 33, result has 31.3 percent of original size [2022-11-25 23:22:12,360 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 2 case distinctions, treesize of input 403 treesize of output 396 [2022-11-25 23:22:12,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:12,588 INFO L321 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-25 23:22:12,589 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 470 treesize of output 466 [2022-11-25 23:22:12,844 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:22:12,844 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 346 treesize of output 353 [2022-11-25 23:22:12,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:12,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:12,879 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:22:12,879 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 346 treesize of output 328 [2022-11-25 23:22:12,936 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:22:12,937 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 340 treesize of output 347 [2022-11-25 23:22:13,217 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:13,260 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:22:13,260 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 673 treesize of output 654 [2022-11-25 23:22:13,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:13,339 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:22:13,340 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 678 treesize of output 679 [2022-11-25 23:22:13,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:13,409 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:22:13,409 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 672 treesize of output 673 [2022-11-25 23:22:13,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:13,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:13,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:13,785 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:13,795 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-25 23:22:13,796 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 356 treesize of output 341 [2022-11-25 23:22:13,824 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:13,826 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:13,845 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:22:13,846 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 2 case distinctions, treesize of input 352 treesize of output 345 [2022-11-25 23:22:13,872 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:13,874 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:13,894 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:22:13,895 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 2 case distinctions, treesize of input 364 treesize of output 357 [2022-11-25 23:22:14,191 INFO L321 Elim1Store]: treesize reduction 27, result has 32.5 percent of original size [2022-11-25 23:22:14,192 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 25 treesize of output 29 [2022-11-25 23:22:14,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:14,270 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:22:14,271 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 84 treesize of output 62 [2022-11-25 23:22:14,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:14,288 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 63 treesize of output 45 [2022-11-25 23:22:14,310 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-25 23:22:14,522 INFO L321 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2022-11-25 23:22:14,523 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 8 case distinctions, treesize of input 35 treesize of output 45 [2022-11-25 23:22:14,588 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 15 treesize of output 1 [2022-11-25 23:22:14,598 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-25 23:22:14,608 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-25 23:22:14,829 INFO L321 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2022-11-25 23:22:14,829 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 30 treesize of output 45 [2022-11-25 23:22:14,878 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 11 treesize of output 7 [2022-11-25 23:22:14,889 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-25 23:22:14,900 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-25 23:22:15,061 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 6 treesize of output 5 [2022-11-25 23:22:15,070 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 9 [2022-11-25 23:22:15,076 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:22:20,393 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4996#(and (< |ULTIMATE.start_main_~i~0#1| 0) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (not (= (select |#valid| |ULTIMATE.start_main_~#s~0#1.base|) 1)) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0))' at error location [2022-11-25 23:22:20,393 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:22:20,393 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:22:20,393 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2022-11-25 23:22:20,393 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375696738] [2022-11-25 23:22:20,393 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:22:20,394 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-25 23:22:20,394 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:22:20,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-25 23:22:20,395 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=376, Unknown=0, NotChecked=0, Total=506 [2022-11-25 23:22:20,395 INFO L87 Difference]: Start difference. First operand 80 states and 89 transitions. Second operand has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:22:20,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:22:20,446 INFO L93 Difference]: Finished difference Result 95 states and 105 transitions. [2022-11-25 23:22:20,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-25 23:22:20,447 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-11-25 23:22:20,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:22:20,448 INFO L225 Difference]: With dead ends: 95 [2022-11-25 23:22:20,448 INFO L226 Difference]: Without dead ends: 95 [2022-11-25 23:22:20,448 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 50 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=149, Invalid=451, Unknown=0, NotChecked=0, Total=600 [2022-11-25 23:22:20,449 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 116 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-25 23:22:20,449 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [116 Valid, 98 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-25 23:22:20,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-11-25 23:22:20,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 91. [2022-11-25 23:22:20,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 78 states have (on average 1.3461538461538463) internal successors, (105), 90 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:22:20,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 105 transitions. [2022-11-25 23:22:20,453 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 105 transitions. Word has length 24 [2022-11-25 23:22:20,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:22:20,454 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 105 transitions. [2022-11-25 23:22:20,454 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 5.142857142857143) internal successors, (36), 6 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:22:20,454 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 105 transitions. [2022-11-25 23:22:20,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-11-25 23:22:20,455 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:22:20,455 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:22:20,467 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-11-25 23:22:20,662 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:22:20,663 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:22:20,663 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:22:20,663 INFO L85 PathProgramCache]: Analyzing trace with hash -1489314543, now seen corresponding path program 1 times [2022-11-25 23:22:20,663 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:22:20,663 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1377215005] [2022-11-25 23:22:20,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:22:20,663 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:22:20,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:22:20,757 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 23:22:20,758 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:22:20,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1377215005] [2022-11-25 23:22:20,758 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1377215005] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:22:20,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1225464451] [2022-11-25 23:22:20,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:22:20,759 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:22:20,759 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:22:20,760 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:22:20,776 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-25 23:22:21,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:22:21,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-25 23:22:21,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:22:21,034 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 23:22:21,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:22:21,047 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-25 23:22:21,048 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 11 [2022-11-25 23:22:21,063 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 23:22:21,063 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1225464451] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:22:21,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [307367040] [2022-11-25 23:22:21,065 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-25 23:22:21,065 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:22:21,066 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:22:21,066 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:22:21,066 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:22:21,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,095 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-25 23:22:21,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,120 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,125 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-25 23:22:21,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,170 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 21 [2022-11-25 23:22:21,182 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 13 treesize of output 9 [2022-11-25 23:22:21,192 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 13 treesize of output 9 [2022-11-25 23:22:21,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,219 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:22:21,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,236 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:22:21,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,253 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:22:21,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,292 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-25 23:22:21,315 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:21,316 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 23 treesize of output 13 [2022-11-25 23:22:21,330 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:21,331 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 23 treesize of output 13 [2022-11-25 23:22:21,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,375 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-25 23:22:21,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,469 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:22:21,469 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 352 treesize of output 334 [2022-11-25 23:22:21,521 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:22:21,522 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 346 treesize of output 353 [2022-11-25 23:22:21,576 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:22:21,576 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 340 treesize of output 347 [2022-11-25 23:22:21,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:21,895 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:22:21,896 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 686 treesize of output 687 [2022-11-25 23:22:21,925 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:21,968 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:22:21,969 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 667 treesize of output 648 [2022-11-25 23:22:22,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:22,048 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:22:22,048 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 672 treesize of output 673 [2022-11-25 23:22:22,561 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:22,561 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:22,587 INFO L321 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-25 23:22:22,587 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 2 case distinctions, treesize of input 377 treesize of output 370 [2022-11-25 23:22:22,613 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:22,614 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:22,638 INFO L321 Elim1Store]: treesize reduction 51, result has 22.7 percent of original size [2022-11-25 23:22:22,639 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 2 case distinctions, treesize of input 461 treesize of output 454 [2022-11-25 23:22:22,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:22,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:22,671 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:22,672 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:22,681 INFO L321 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-11-25 23:22:22,682 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 507 treesize of output 492 [2022-11-25 23:22:22,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:22,922 INFO L321 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-25 23:22:22,923 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 492 treesize of output 488 [2022-11-25 23:22:23,184 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:22:23,185 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 346 treesize of output 353 [2022-11-25 23:22:23,239 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:22:23,240 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 340 treesize of output 347 [2022-11-25 23:22:23,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:23,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:23,271 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:22:23,272 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 340 treesize of output 322 [2022-11-25 23:22:23,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:23,592 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:22:23,593 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 686 treesize of output 687 [2022-11-25 23:22:23,619 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:23,666 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:22:23,667 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 667 treesize of output 648 [2022-11-25 23:22:23,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:23,743 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:22:23,743 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 672 treesize of output 673 [2022-11-25 23:22:24,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:24,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:24,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:24,346 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:24,356 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-25 23:22:24,357 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 352 treesize of output 337 [2022-11-25 23:22:24,382 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:24,383 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:24,403 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:22:24,403 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 2 case distinctions, treesize of input 348 treesize of output 341 [2022-11-25 23:22:24,427 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:24,428 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:24,446 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:22:24,447 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 2 case distinctions, treesize of input 360 treesize of output 353 [2022-11-25 23:22:24,666 INFO L321 Elim1Store]: treesize reduction 27, result has 32.5 percent of original size [2022-11-25 23:22:24,667 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 25 treesize of output 29 [2022-11-25 23:22:24,712 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:24,718 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:22:24,719 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 84 treesize of output 62 [2022-11-25 23:22:24,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:24,735 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 63 treesize of output 45 [2022-11-25 23:22:24,754 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-25 23:22:24,918 INFO L321 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2022-11-25 23:22:24,918 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 8 case distinctions, treesize of input 35 treesize of output 45 [2022-11-25 23:22:24,962 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-25 23:22:24,985 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-25 23:22:24,997 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-25 23:22:25,214 INFO L321 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2022-11-25 23:22:25,214 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 30 treesize of output 45 [2022-11-25 23:22:25,263 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-25 23:22:25,273 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-25 23:22:25,283 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 15 treesize of output 1 [2022-11-25 23:22:25,447 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 9 [2022-11-25 23:22:25,458 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 6 treesize of output 5 [2022-11-25 23:22:25,471 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:22:30,763 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5345#(and (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.offset|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.offset|) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (not (= (select |#valid| |ULTIMATE.start_sll_remove_last_~head#1.base|) 1)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (= |#NULL.offset| 0) (<= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= |ULTIMATE.start_main_~i~0#1| 1) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.base|))' at error location [2022-11-25 23:22:30,763 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:22:30,763 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:22:30,763 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2022-11-25 23:22:30,764 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28107914] [2022-11-25 23:22:30,764 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:22:30,764 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-25 23:22:30,764 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:22:30,764 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-25 23:22:30,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=291, Unknown=0, NotChecked=0, Total=380 [2022-11-25 23:22:30,765 INFO L87 Difference]: Start difference. First operand 91 states and 105 transitions. Second operand has 5 states, 4 states have (on average 4.75) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:22:30,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:22:30,852 INFO L93 Difference]: Finished difference Result 97 states and 112 transitions. [2022-11-25 23:22:30,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-25 23:22:30,857 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.75) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 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 24 [2022-11-25 23:22:30,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:22:30,858 INFO L225 Difference]: With dead ends: 97 [2022-11-25 23:22:30,858 INFO L226 Difference]: Without dead ends: 97 [2022-11-25 23:22:30,858 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 55 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=94, Invalid=326, Unknown=0, NotChecked=0, Total=420 [2022-11-25 23:22:30,859 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 93 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:22:30,859 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [93 Valid, 21 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:22:30,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-11-25 23:22:30,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2022-11-25 23:22:30,862 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 84 states have (on average 1.3333333333333333) internal successors, (112), 96 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:22:30,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 112 transitions. [2022-11-25 23:22:30,863 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 112 transitions. Word has length 24 [2022-11-25 23:22:30,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:22:30,863 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 112 transitions. [2022-11-25 23:22:30,864 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.75) internal successors, (19), 5 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:22:30,864 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 112 transitions. [2022-11-25 23:22:30,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-25 23:22:30,864 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:22:30,865 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:22:30,877 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-11-25 23:22:31,072 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:22:31,072 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr26ASSERT_VIOLATIONMEMORY_FREE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:22:31,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:22:31,073 INFO L85 PathProgramCache]: Analyzing trace with hash -110485722, now seen corresponding path program 1 times [2022-11-25 23:22:31,073 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:22:31,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216095480] [2022-11-25 23:22:31,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:22:31,073 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:22:31,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:22:31,648 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:22:31,649 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:22:31,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216095480] [2022-11-25 23:22:31,649 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [216095480] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:22:31,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [135368915] [2022-11-25 23:22:31,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:22:31,649 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:22:31,650 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:22:31,651 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:22:31,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-25 23:22:31,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:22:31,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-25 23:22:31,916 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:22:32,031 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2022-11-25 23:22:32,152 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-25 23:22:32,406 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2022-11-25 23:22:32,488 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2022-11-25 23:22:32,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:32,584 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:32,588 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:22:32,589 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 4 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 15 [2022-11-25 23:22:32,601 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:22:32,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:22:32,899 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 16 treesize of output 8 [2022-11-25 23:22:33,013 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:22:33,013 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 4 new quantified variables, introduced 3 case distinctions, treesize of input 170 treesize of output 176 [2022-11-25 23:22:33,653 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:22:33,653 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [135368915] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:22:33,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [200900293] [2022-11-25 23:22:33,656 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-25 23:22:33,656 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:22:33,656 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:22:33,657 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:22:33,657 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:22:33,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,678 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-25 23:22:33,706 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,712 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,713 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-25 23:22:33,754 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 13 treesize of output 9 [2022-11-25 23:22:33,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,775 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 21 [2022-11-25 23:22:33,788 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 13 treesize of output 9 [2022-11-25 23:22:33,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,816 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:22:33,834 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,834 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:22:33,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,853 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:22:33,882 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:33,883 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 23 treesize of output 13 [2022-11-25 23:22:33,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,902 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-25 23:22:33,922 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:33,923 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 23 treesize of output 13 [2022-11-25 23:22:33,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:33,969 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-25 23:22:34,089 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:22:34,090 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 339 treesize of output 346 [2022-11-25 23:22:34,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:34,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:34,124 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:22:34,124 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 339 treesize of output 321 [2022-11-25 23:22:34,178 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:22:34,178 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 333 treesize of output 340 [2022-11-25 23:22:34,664 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:34,707 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:22:34,707 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 1155 treesize of output 1104 [2022-11-25 23:22:34,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:34,801 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:22:34,802 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 1152 treesize of output 1147 [2022-11-25 23:22:34,834 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:34,878 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:22:34,878 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 1140 treesize of output 1135 [2022-11-25 23:22:35,557 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:35,558 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:35,583 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:22:35,583 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 2 case distinctions, treesize of input 344 treesize of output 337 [2022-11-25 23:22:35,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:35,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:35,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:35,613 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:35,623 INFO L321 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-11-25 23:22:35,623 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 408 treesize of output 393 [2022-11-25 23:22:35,646 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:35,647 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:35,667 INFO L321 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2022-11-25 23:22:35,668 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 2 case distinctions, treesize of input 404 treesize of output 397 [2022-11-25 23:22:35,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:35,892 INFO L321 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-25 23:22:35,893 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 405 treesize of output 409 [2022-11-25 23:22:36,138 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:22:36,139 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 339 treesize of output 346 [2022-11-25 23:22:36,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:36,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:36,170 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:22:36,171 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 339 treesize of output 321 [2022-11-25 23:22:36,228 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:22:36,229 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 333 treesize of output 340 [2022-11-25 23:22:36,532 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:36,583 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:22:36,584 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 659 treesize of output 640 [2022-11-25 23:22:36,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:36,670 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:22:36,671 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 664 treesize of output 665 [2022-11-25 23:22:36,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:36,754 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:22:36,755 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 658 treesize of output 659 [2022-11-25 23:22:37,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:37,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:37,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:37,164 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:37,174 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-25 23:22:37,174 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 352 treesize of output 337 [2022-11-25 23:22:37,197 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:37,198 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:37,217 INFO L321 Elim1Store]: treesize reduction 25, result has 21.9 percent of original size [2022-11-25 23:22:37,218 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 2 case distinctions, treesize of input 348 treesize of output 341 [2022-11-25 23:22:37,238 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:37,239 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:37,259 INFO L321 Elim1Store]: treesize reduction 49, result has 21.0 percent of original size [2022-11-25 23:22:37,260 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 2 case distinctions, treesize of input 414 treesize of output 407 [2022-11-25 23:22:37,694 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-25 23:22:37,706 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-25 23:22:37,717 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-25 23:22:37,762 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 6 treesize of output 5 [2022-11-25 23:22:37,773 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 9 [2022-11-25 23:22:37,776 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:22:45,641 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5730#(and (<= 1 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_sll_remove_last_~last~0#1.offset| 0) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.offset|) (not (< |ULTIMATE.start_sll_remove_last_~last~0#1.base| |#StackHeapBarrier|)) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.offset|) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|) (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) 0) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 8) (select |#length| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|)) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (= |#NULL.offset| 0) (<= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) (<= |ULTIMATE.start_main_~i~0#1| 1) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|) (+ |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset| 4)) 0) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0) (= (select |#valid| |ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base|) 1) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.base|))' at error location [2022-11-25 23:22:45,641 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:22:45,641 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:22:45,641 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 29 [2022-11-25 23:22:45,641 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471773991] [2022-11-25 23:22:45,641 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:22:45,642 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-11-25 23:22:45,642 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:22:45,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-11-25 23:22:45,643 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=1785, Unknown=0, NotChecked=0, Total=1980 [2022-11-25 23:22:45,644 INFO L87 Difference]: Start difference. First operand 97 states and 112 transitions. Second operand has 30 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 30 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:22:47,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:22:47,495 INFO L93 Difference]: Finished difference Result 129 states and 145 transitions. [2022-11-25 23:22:47,495 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-25 23:22:47,495 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 30 states have internal predecessors, (59), 0 states have call successors, (0), 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 25 [2022-11-25 23:22:47,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:22:47,496 INFO L225 Difference]: With dead ends: 129 [2022-11-25 23:22:47,497 INFO L226 Difference]: Without dead ends: 129 [2022-11-25 23:22:47,498 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 37 SyntacticMatches, 4 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 636 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=410, Invalid=2560, Unknown=0, NotChecked=0, Total=2970 [2022-11-25 23:22:47,498 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 1033 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 427 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1033 SdHoareTripleChecker+Valid, 215 SdHoareTripleChecker+Invalid, 443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 427 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-25 23:22:47,499 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1033 Valid, 215 Invalid, 443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 427 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-25 23:22:47,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2022-11-25 23:22:47,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 98. [2022-11-25 23:22:47,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 85 states have (on average 1.3294117647058823) internal successors, (113), 97 states have internal predecessors, (113), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:22:47,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 113 transitions. [2022-11-25 23:22:47,503 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 113 transitions. Word has length 25 [2022-11-25 23:22:47,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:22:47,503 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 113 transitions. [2022-11-25 23:22:47,504 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 29 states have (on average 2.0344827586206895) internal successors, (59), 30 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:22:47,504 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 113 transitions. [2022-11-25 23:22:47,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-25 23:22:47,504 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:22:47,504 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:22:47,515 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-11-25 23:22:47,705 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-25 23:22:47,705 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:22:47,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:22:47,705 INFO L85 PathProgramCache]: Analyzing trace with hash 1075889443, now seen corresponding path program 1 times [2022-11-25 23:22:47,705 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:22:47,706 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745452592] [2022-11-25 23:22:47,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:22:47,706 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:22:47,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:22:48,408 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:22:48,408 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:22:48,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745452592] [2022-11-25 23:22:48,409 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1745452592] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:22:48,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [64691348] [2022-11-25 23:22:48,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:22:48,409 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:22:48,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:22:48,411 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:22:48,430 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-25 23:22:48,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:22:48,655 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 53 conjunts are in the unsatisfiable core [2022-11-25 23:22:48,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:22:48,826 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 11 treesize of output 7 [2022-11-25 23:22:48,998 INFO L321 Elim1Store]: treesize reduction 4, result has 88.6 percent of original size [2022-11-25 23:22:48,998 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 5 new quantified variables, introduced 5 case distinctions, treesize of input 30 treesize of output 44 [2022-11-25 23:22:49,100 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 16 treesize of output 8 [2022-11-25 23:22:49,126 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:22:49,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:22:49,240 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2022-11-25 23:22:49,393 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:22:49,393 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 4 new quantified variables, introduced 3 case distinctions, treesize of input 129 treesize of output 139 [2022-11-25 23:22:49,706 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:22:49,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [64691348] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:22:49,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [399104255] [2022-11-25 23:22:49,709 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-25 23:22:49,709 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:22:49,709 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:22:49,710 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:22:49,710 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:22:49,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:49,731 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:49,732 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-25 23:22:49,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:49,766 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:49,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:49,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:49,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:49,772 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-25 23:22:49,814 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 13 treesize of output 9 [2022-11-25 23:22:49,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:49,827 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 21 [2022-11-25 23:22:49,841 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 13 treesize of output 9 [2022-11-25 23:22:49,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:49,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:49,872 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:22:49,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:49,904 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:22:49,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:49,921 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:22:49,957 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:49,958 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 23 treesize of output 13 [2022-11-25 23:22:49,974 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:49,975 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 23 treesize of output 13 [2022-11-25 23:22:49,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:49,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:49,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:49,998 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-25 23:22:50,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:50,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:50,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:50,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:50,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:50,038 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:50,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:50,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:50,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:50,044 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-25 23:22:50,164 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:22:50,165 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 339 treesize of output 346 [2022-11-25 23:22:50,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:50,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:50,236 INFO L321 Elim1Store]: treesize reduction 49, result has 25.8 percent of original size [2022-11-25 23:22:50,236 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 339 treesize of output 331 [2022-11-25 23:22:50,290 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:22:50,290 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 329 treesize of output 336 [2022-11-25 23:22:50,805 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:50,871 INFO L321 Elim1Store]: treesize reduction 56, result has 29.1 percent of original size [2022-11-25 23:22:50,872 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 850 treesize of output 823 [2022-11-25 23:22:50,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:50,955 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:22:50,956 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 851 treesize of output 846 [2022-11-25 23:22:50,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:51,026 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:22:51,027 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 839 treesize of output 840 [2022-11-25 23:22:51,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:51,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:51,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:51,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:51,605 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:51,606 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:51,616 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-25 23:22:51,616 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 387 treesize of output 372 [2022-11-25 23:22:51,648 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:51,649 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:51,671 INFO L321 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-25 23:22:51,671 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 2 case distinctions, treesize of input 383 treesize of output 376 [2022-11-25 23:22:51,699 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:51,700 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:51,720 INFO L321 Elim1Store]: treesize reduction 33, result has 31.3 percent of original size [2022-11-25 23:22:51,720 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 2 case distinctions, treesize of input 437 treesize of output 430 [2022-11-25 23:22:51,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:51,960 INFO L321 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-25 23:22:51,960 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 510 treesize of output 514 [2022-11-25 23:22:52,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:52,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:52,227 INFO L321 Elim1Store]: treesize reduction 49, result has 25.8 percent of original size [2022-11-25 23:22:52,227 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 345 treesize of output 337 [2022-11-25 23:22:52,296 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:22:52,297 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 335 treesize of output 342 [2022-11-25 23:22:52,352 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:22:52,353 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 329 treesize of output 336 [2022-11-25 23:22:52,858 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:52,923 INFO L321 Elim1Store]: treesize reduction 56, result has 29.1 percent of original size [2022-11-25 23:22:52,924 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 850 treesize of output 823 [2022-11-25 23:22:52,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:53,011 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:22:53,012 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 851 treesize of output 852 [2022-11-25 23:22:53,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:53,083 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:22:53,084 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 845 treesize of output 840 [2022-11-25 23:22:53,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:53,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:53,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:53,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:53,613 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:53,614 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:53,624 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-25 23:22:53,625 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 389 treesize of output 374 [2022-11-25 23:22:53,651 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:53,652 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:53,671 INFO L321 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-25 23:22:53,672 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 2 case distinctions, treesize of input 385 treesize of output 378 [2022-11-25 23:22:53,697 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:53,698 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:22:53,718 INFO L321 Elim1Store]: treesize reduction 33, result has 31.3 percent of original size [2022-11-25 23:22:53,718 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 2 case distinctions, treesize of input 439 treesize of output 432 [2022-11-25 23:22:53,950 INFO L321 Elim1Store]: treesize reduction 27, result has 32.5 percent of original size [2022-11-25 23:22:53,950 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 25 treesize of output 29 [2022-11-25 23:22:54,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:54,008 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:22:54,009 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 84 treesize of output 62 [2022-11-25 23:22:54,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:22:54,025 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 63 treesize of output 45 [2022-11-25 23:22:54,042 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-25 23:22:54,211 INFO L321 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2022-11-25 23:22:54,212 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 3 new quantified variables, introduced 8 case distinctions, treesize of input 35 treesize of output 45 [2022-11-25 23:22:54,271 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 15 treesize of output 1 [2022-11-25 23:22:54,279 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 11 treesize of output 7 [2022-11-25 23:22:54,289 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-25 23:22:54,510 INFO L321 Elim1Store]: treesize reduction 60, result has 31.0 percent of original size [2022-11-25 23:22:54,510 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 30 treesize of output 45 [2022-11-25 23:22:54,559 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 [2022-11-25 23:22:54,569 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-25 23:22:54,580 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 11 treesize of output 7 [2022-11-25 23:22:54,748 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 9 [2022-11-25 23:22:54,760 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 6 treesize of output 5 [2022-11-25 23:22:54,762 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:23:01,232 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6167#(and (= (select |#valid| |ULTIMATE.start_sll_remove_last_~head#1.base|) 1) (not (= (select |#valid| |ULTIMATE.start_sll_remove_last_#t~mem6#1.base|) 1)) (<= (+ |ULTIMATE.start_sll_remove_last_~head#1.offset| 4) (select |#length| |ULTIMATE.start_sll_remove_last_~head#1.base|)) (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.offset|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.base|) (= |ULTIMATE.start_sll_remove_last_#t~mem6#1.offset| (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_remove_last_~head#1.base|) |ULTIMATE.start_sll_remove_last_~head#1.offset|)) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.offset|) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_remove_last_~head#1.base|) |ULTIMATE.start_sll_remove_last_~head#1.offset|) |ULTIMATE.start_sll_remove_last_#t~mem6#1.base|) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (<= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= 0 |#NULL.offset|) (<= |ULTIMATE.start_main_~i~0#1| 1) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_main_~#s~0#1.offset|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.base|))' at error location [2022-11-25 23:23:01,232 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:23:01,232 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:23:01,232 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 14, 14] total 31 [2022-11-25 23:23:01,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [166944651] [2022-11-25 23:23:01,233 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:23:01,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-11-25 23:23:01,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:23:01,234 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-11-25 23:23:01,235 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=1873, Unknown=0, NotChecked=0, Total=2070 [2022-11-25 23:23:01,235 INFO L87 Difference]: Start difference. First operand 98 states and 113 transitions. Second operand has 31 states, 31 states have (on average 1.6129032258064515) internal successors, (50), 31 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:23:02,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:23:02,143 INFO L93 Difference]: Finished difference Result 93 states and 104 transitions. [2022-11-25 23:23:02,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-25 23:23:02,144 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.6129032258064515) internal successors, (50), 31 states have internal predecessors, (50), 0 states have call successors, (0), 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 25 [2022-11-25 23:23:02,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:23:02,145 INFO L225 Difference]: With dead ends: 93 [2022-11-25 23:23:02,145 INFO L226 Difference]: Without dead ends: 93 [2022-11-25 23:23:02,146 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 711 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=397, Invalid=2683, Unknown=0, NotChecked=0, Total=3080 [2022-11-25 23:23:02,146 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 420 mSDsluCounter, 311 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 420 SdHoareTripleChecker+Valid, 340 SdHoareTripleChecker+Invalid, 383 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-25 23:23:02,147 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [420 Valid, 340 Invalid, 383 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 379 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-25 23:23:02,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-11-25 23:23:02,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 91. [2022-11-25 23:23:02,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 78 states have (on average 1.3333333333333333) internal successors, (104), 90 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:23:02,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 104 transitions. [2022-11-25 23:23:02,150 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 104 transitions. Word has length 25 [2022-11-25 23:23:02,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:23:02,150 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 104 transitions. [2022-11-25 23:23:02,151 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.6129032258064515) internal successors, (50), 31 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:23:02,151 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 104 transitions. [2022-11-25 23:23:02,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-25 23:23:02,151 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:23:02,152 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:23:02,165 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-11-25 23:23:02,359 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-25 23:23:02,360 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:23:02,360 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:23:02,360 INFO L85 PathProgramCache]: Analyzing trace with hash -342360157, now seen corresponding path program 1 times [2022-11-25 23:23:02,361 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:23:02,361 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [923559223] [2022-11-25 23:23:02,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:23:02,361 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:23:02,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:23:02,610 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-25 23:23:02,610 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:23:02,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [923559223] [2022-11-25 23:23:02,611 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [923559223] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:23:02,611 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637714103] [2022-11-25 23:23:02,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:23:02,611 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:23:02,611 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:23:02,613 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:23:02,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-25 23:23:02,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:23:02,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-25 23:23:02,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:23:02,992 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:02,993 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 14 [2022-11-25 23:23:03,002 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-25 23:23:03,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:23:03,104 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:23:03,104 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 21 [2022-11-25 23:23:03,165 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2022-11-25 23:23:03,165 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [637714103] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-25 23:23:03,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1166842759] [2022-11-25 23:23:03,167 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-25 23:23:03,167 INFO L166 IcfgInterpreter]: Building call graph [2022-11-25 23:23:03,168 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-25 23:23:03,168 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-25 23:23:03,168 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-25 23:23:03,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,196 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2022-11-25 23:23:03,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,231 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 30 [2022-11-25 23:23:03,264 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 13 treesize of output 9 [2022-11-25 23:23:03,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,279 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 21 [2022-11-25 23:23:03,295 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 13 treesize of output 9 [2022-11-25 23:23:03,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,327 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:23:03,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,343 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2022-11-25 23:23:03,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,370 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-25 23:23:03,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,414 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 31 [2022-11-25 23:23:03,437 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:23:03,438 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 23 treesize of output 13 [2022-11-25 23:23:03,456 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:23:03,457 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 23 treesize of output 13 [2022-11-25 23:23:03,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,499 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,513 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 13 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 43 [2022-11-25 23:23:03,630 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:23:03,630 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 339 treesize of output 346 [2022-11-25 23:23:03,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,663 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:23:03,664 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 339 treesize of output 321 [2022-11-25 23:23:03,719 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:23:03,720 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 333 treesize of output 340 [2022-11-25 23:23:03,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:03,971 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:23:03,971 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 366 treesize of output 367 [2022-11-25 23:23:03,999 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:23:04,036 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:23:04,037 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 347 treesize of output 348 [2022-11-25 23:23:04,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:04,107 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:23:04,107 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 356 treesize of output 357 [2022-11-25 23:23:04,490 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:23:04,491 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:23:04,515 INFO L321 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-25 23:23:04,515 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 2 case distinctions, treesize of input 373 treesize of output 366 [2022-11-25 23:23:04,540 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:23:04,541 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:23:04,564 INFO L321 Elim1Store]: treesize reduction 33, result has 31.3 percent of original size [2022-11-25 23:23:04,564 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 2 case distinctions, treesize of input 415 treesize of output 408 [2022-11-25 23:23:04,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:04,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:04,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:04,592 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:23:04,602 INFO L321 Elim1Store]: treesize reduction 36, result has 2.7 percent of original size [2022-11-25 23:23:04,603 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 497 treesize of output 482 [2022-11-25 23:23:04,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:04,824 INFO L321 Elim1Store]: treesize reduction 170, result has 13.7 percent of original size [2022-11-25 23:23:04,825 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 3 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 13 case distinctions, treesize of input 482 treesize of output 486 [2022-11-25 23:23:05,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:05,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:05,067 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-25 23:23:05,068 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 345 treesize of output 327 [2022-11-25 23:23:05,120 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:23:05,120 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 339 treesize of output 346 [2022-11-25 23:23:05,172 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-25 23:23:05,173 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 333 treesize of output 340 [2022-11-25 23:23:05,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:05,689 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:23:05,690 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 1168 treesize of output 1163 [2022-11-25 23:23:05,725 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:23:05,765 INFO L321 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2022-11-25 23:23:05,765 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 1143 treesize of output 1092 [2022-11-25 23:23:05,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:05,873 INFO L321 Elim1Store]: treesize reduction 37, result has 33.9 percent of original size [2022-11-25 23:23:05,873 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 1140 treesize of output 1135 [2022-11-25 23:23:06,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:06,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:06,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:06,452 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:23:06,462 INFO L321 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2022-11-25 23:23:06,463 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 372 treesize of output 357 [2022-11-25 23:23:06,490 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:23:06,491 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:23:06,510 INFO L321 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2022-11-25 23:23:06,511 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 368 treesize of output 361 [2022-11-25 23:23:06,533 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:23:06,534 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-25 23:23:06,554 INFO L321 Elim1Store]: treesize reduction 51, result has 22.7 percent of original size [2022-11-25 23:23:06,554 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 2 case distinctions, treesize of input 440 treesize of output 433 [2022-11-25 23:23:06,974 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-25 23:23:06,984 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-25 23:23:06,998 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-25 23:23:07,091 INFO L321 Elim1Store]: treesize reduction 10, result has 64.3 percent of original size [2022-11-25 23:23:07,092 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 21 treesize of output 33 [2022-11-25 23:23:08,042 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-25 23:23:08,053 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 19 treesize of output 1 [2022-11-25 23:23:08,073 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-25 23:23:08,131 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 13 [2022-11-25 23:23:08,555 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-25 23:23:08,567 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-25 23:23:08,577 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-25 23:23:08,631 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 13 [2022-11-25 23:23:09,169 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 12 treesize of output 9 [2022-11-25 23:23:09,182 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 6 treesize of output 5 [2022-11-25 23:23:09,187 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-25 23:23:16,343 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6568#(and (<= 1 |ULTIMATE.start_sll_create_#in~data#1|) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.offset|) (<= |ULTIMATE.start_sll_create_#in~data#1| 1) (<= |ULTIMATE.start_sll_create_~head~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_~head#1.base|) (<= |ULTIMATE.start_sll_create_~len#1| 0) (<= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= |ULTIMATE.start_sll_remove_last_~head#1.offset| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.offset|) (<= 1 |ULTIMATE.start_sll_create_~data#1|) (not (= (select |#valid| |ULTIMATE.start_sll_remove_last_~head#1.base|) 1)) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~data~0#1| 1) (<= |ULTIMATE.start_sll_create_~data#1| 1) (<= |ULTIMATE.start_sll_create_#in~len#1| 2) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 0 |ULTIMATE.start_sll_create_~len#1|) (= |ULTIMATE.start_main_~len~0#1| 2) (= |#NULL.offset| 0) (<= |ULTIMATE.start_sll_remove_last_#in~head#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#s~0#1.base|) (<= 0 |ULTIMATE.start_sll_create_#res#1.offset|) (<= |ULTIMATE.start_main_~i~0#1| 1) (<= 0 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_sll_create_#in~len#1|) (<= 0 |ULTIMATE.start_sll_create_~head~0#1.offset|) (= |#NULL.base| 0) (<= 0 |ULTIMATE.start_sll_remove_last_#in~head#1.base|))' at error location [2022-11-25 23:23:16,343 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-25 23:23:16,343 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-25 23:23:16,343 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6, 6] total 12 [2022-11-25 23:23:16,343 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966687579] [2022-11-25 23:23:16,344 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-25 23:23:16,344 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-25 23:23:16,344 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-25 23:23:16,345 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-25 23:23:16,345 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=892, Unknown=0, NotChecked=0, Total=1056 [2022-11-25 23:23:16,346 INFO L87 Difference]: Start difference. First operand 91 states and 104 transitions. Second operand has 14 states, 13 states have (on average 4.076923076923077) internal successors, (53), 13 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:23:16,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-25 23:23:16,517 INFO L93 Difference]: Finished difference Result 92 states and 105 transitions. [2022-11-25 23:23:16,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-25 23:23:16,517 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 4.076923076923077) internal successors, (53), 13 states have internal predecessors, (53), 0 states have call successors, (0), 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 [2022-11-25 23:23:16,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-25 23:23:16,518 INFO L225 Difference]: With dead ends: 92 [2022-11-25 23:23:16,518 INFO L226 Difference]: Without dead ends: 92 [2022-11-25 23:23:16,518 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 467 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=192, Invalid=998, Unknown=0, NotChecked=0, Total=1190 [2022-11-25 23:23:16,519 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 63 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-25 23:23:16,519 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [63 Valid, 44 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-25 23:23:16,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2022-11-25 23:23:16,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 85. [2022-11-25 23:23:16,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 74 states have (on average 1.3108108108108107) internal successors, (97), 84 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:23:16,522 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 97 transitions. [2022-11-25 23:23:16,522 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 97 transitions. Word has length 29 [2022-11-25 23:23:16,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-25 23:23:16,523 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 97 transitions. [2022-11-25 23:23:16,523 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 13 states have (on average 4.076923076923077) internal successors, (53), 13 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-25 23:23:16,523 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 97 transitions. [2022-11-25 23:23:16,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-25 23:23:16,524 INFO L187 NwaCegarLoop]: Found error trace [2022-11-25 23:23:16,524 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-25 23:23:16,534 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-11-25 23:23:16,731 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:23:16,732 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 29 more)] === [2022-11-25 23:23:16,732 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-25 23:23:16,732 INFO L85 PathProgramCache]: Analyzing trace with hash 700469020, now seen corresponding path program 3 times [2022-11-25 23:23:16,732 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-25 23:23:16,732 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1881160784] [2022-11-25 23:23:16,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-25 23:23:16,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-25 23:23:16,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-25 23:23:16,848 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-25 23:23:16,848 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-25 23:23:16,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1881160784] [2022-11-25 23:23:16,848 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1881160784] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-25 23:23:16,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [744530464] [2022-11-25 23:23:16,849 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-25 23:23:16,849 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-25 23:23:16,849 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 [2022-11-25 23:23:16,851 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-25 23:23:16,854 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3afa5cc2-1691-4946-b74a-6c32fde45f46/bin/utaipan-ByfvJB40ur/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-25 23:23:17,100 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-25 23:23:17,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-25 23:23:17,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 334 conjuncts, 98 conjunts are in the unsatisfiable core [2022-11-25 23:23:17,113 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-25 23:23:17,166 INFO L321 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2022-11-25 23:23:17,167 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 2 case distinctions, treesize of input 17 treesize of output 21 [2022-11-25 23:23:17,178 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 14 treesize of output 16 [2022-11-25 23:23:17,285 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 13 treesize of output 9 [2022-11-25 23:23:17,291 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 13 treesize of output 9 [2022-11-25 23:23:17,360 INFO L321 Elim1Store]: treesize reduction 23, result has 47.7 percent of original size [2022-11-25 23:23:17,360 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 26 treesize of output 38 [2022-11-25 23:23:17,391 INFO L321 Elim1Store]: treesize reduction 8, result has 65.2 percent of original size [2022-11-25 23:23:17,392 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 22 treesize of output 24 [2022-11-25 23:23:17,459 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 46 treesize of output 44 [2022-11-25 23:23:17,465 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 37 [2022-11-25 23:23:17,490 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 46 treesize of output 44 [2022-11-25 23:23:17,498 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 37 [2022-11-25 23:23:17,553 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 45 treesize of output 36 [2022-11-25 23:23:17,562 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 56 treesize of output 45 [2022-11-25 23:23:33,267 INFO L321 Elim1Store]: treesize reduction 57, result has 32.9 percent of original size [2022-11-25 23:23:33,267 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 7 new quantified variables, introduced 6 case distinctions, treesize of input 242 treesize of output 116 [2022-11-25 23:23:33,313 INFO L321 Elim1Store]: treesize reduction 42, result has 6.7 percent of original size [2022-11-25 23:23:33,314 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 4 case distinctions, treesize of input 68 treesize of output 43 [2022-11-25 23:23:33,414 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 11 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-25 23:23:33,414 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-25 23:23:54,708 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:23:54,708 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 204 treesize of output 172 [2022-11-25 23:23:54,724 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:23:54,725 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 169 treesize of output 137 [2022-11-25 23:23:54,771 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:23:54,771 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 112 treesize of output 100 [2022-11-25 23:23:54,787 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:23:54,787 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 97 treesize of output 80 [2022-11-25 23:23:54,827 WARN L837 $PredicateComparison]: unable to prove that (and (forall ((v_arrayElimArr_11 (Array Int Int)) (v_arrayElimArr_12 (Array Int Int)) (|ULTIMATE.start_main_~#s~0#1.offset| Int) (|ULTIMATE.start_main_~#s~0#1.base| Int)) (let ((.cse2 (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_node_create_~temp~0#1.base| v_arrayElimArr_12)) (.cse3 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_node_create_~temp~0#1.base| v_arrayElimArr_11))) (let ((.cse1 (select (select .cse3 |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|)) (.cse0 (+ (select (select .cse2 |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) 4))) (or (not (= (select v_arrayElimArr_12 .cse0) |c_ULTIMATE.start_sll_create_~head~0#1.offset|)) (not (= |c_ULTIMATE.start_node_create_~temp~0#1.base| .cse1)) (not (= (select v_arrayElimArr_11 .cse0) |c_ULTIMATE.start_sll_create_~head~0#1.base|)) (<= 0 (+ (select (select .cse2 (select (select .cse3 .cse1) .cse0)) (+ 4 (select (select .cse2 .cse1) .cse0))) 4)))))) (forall ((v_arrayElimArr_10 (Array Int Int)) (|ULTIMATE.start_main_~#s~0#1.offset| Int) (|ULTIMATE.start_main_~#s~0#1.base| Int) (v_arrayElimArr_9 (Array Int Int))) (let ((.cse6 (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_node_create_~temp~0#1.base| v_arrayElimArr_10)) (.cse9 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_node_create_~temp~0#1.base| v_arrayElimArr_9))) (let ((.cse5 (select (select .cse9 |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|)) (.cse4 (+ (select (select .cse6 |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) 4))) (or (not (= (select v_arrayElimArr_10 .cse4) |c_ULTIMATE.start_sll_create_~head~0#1.offset|)) (not (= (select v_arrayElimArr_9 .cse4) |c_ULTIMATE.start_sll_create_~head~0#1.base|)) (not (= |c_ULTIMATE.start_node_create_~temp~0#1.base| .cse5)) (let ((.cse7 (select (select .cse9 .cse5) .cse4)) (.cse8 (+ (select (select .cse6 .cse5) .cse4) 4))) (<= (+ 8 (select (select .cse6 .cse7) .cse8)) (select |c_#length| (select (select .cse9 .cse7) .cse8))))))))) is different from false [2022-11-25 23:23:58,659 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:23:58,660 INFO L350 Elim1Store]: Elim1 eliminated variable 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 152 treesize of output 122 [2022-11-25 23:23:58,677 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:23:58,677 INFO L350 Elim1Store]: Elim1 eliminated variable 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 151 treesize of output 101 [2022-11-25 23:23:58,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-25 23:23:58,929 INFO L321 Elim1Store]: treesize reduction 50, result has 66.0 percent of original size [2022-11-25 23:23:58,930 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 6 new quantified variables, introduced 6 case distinctions, treesize of input 286 treesize of output 322 [2022-11-25 23:23:59,676 INFO L321 Elim1Store]: treesize reduction 58, result has 70.4 percent of original size [2022-11-25 23:23:59,677 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 7 new quantified variables, introduced 15 case distinctions, treesize of input 884 treesize of output 791 [2022-11-25 23:23:59,805 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:23:59,806 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 754 treesize of output 690 [2022-11-25 23:24:00,077 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:24:00,077 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 8 new quantified variables, introduced 10 case distinctions, treesize of input 665 treesize of output 709 [2022-11-25 23:24:03,267 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:24:03,267 INFO L350 Elim1Store]: Elim1 eliminated variable 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 282 treesize of output 212 [2022-11-25 23:24:03,287 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:24:03,288 INFO L350 Elim1Store]: Elim1 eliminated variable 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 241 treesize of output 161 [2022-11-25 23:24:04,577 INFO L321 Elim1Store]: treesize reduction 289, result has 61.2 percent of original size [2022-11-25 23:24:04,578 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 12 new quantified variables, introduced 28 case distinctions, treesize of input 970 treesize of output 1111 [2022-11-25 23:24:26,603 WARN L233 SmtUtils]: Spent 21.87s on a formula simplification. DAG size of input: 688 DAG size of output: 479 (called from [L 318] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2022-11-25 23:24:26,606 INFO L321 Elim1Store]: treesize reduction 1065, result has 63.5 percent of original size [2022-11-25 23:24:26,608 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 27 new quantified variables, introduced 190 case distinctions, treesize of input 4774 treesize of output 5165 [2022-11-25 23:24:29,608 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-25 23:24:29,609 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 12 new quantified variables, introduced 36 case distinctions, treesize of input 4758 treesize of output 4298 [2022-11-25 23:24:31,080 INFO L217 Elim1Store]: Index analysis took 363 ms [2022-11-25 23:24:34,175 INFO L321 Elim1Store]: treesize reduction 8, result has 97.4 percent of original size [2022-11-25 23:24:34,176 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 9 new quantified variables, introduced 36 case distinctions, treesize of input 3476 treesize of output 3280