./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/heap-manipulation/dancing.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 4e7fbc69 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_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/heap-manipulation/dancing.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW --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 c2e0266b63b958a771d0226973905d5a39a7a28d05d194ae66381394d9ab520a --- 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-4e7fbc6 [2022-11-23 14:47:31,601 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-23 14:47:31,603 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-23 14:47:31,626 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-23 14:47:31,626 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-23 14:47:31,627 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-23 14:47:31,629 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-23 14:47:31,630 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-23 14:47:31,632 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-23 14:47:31,633 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-23 14:47:31,634 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-23 14:47:31,635 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-23 14:47:31,636 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-23 14:47:31,637 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-23 14:47:31,638 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-23 14:47:31,639 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-23 14:47:31,640 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-23 14:47:31,641 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-23 14:47:31,643 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-23 14:47:31,645 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-23 14:47:31,647 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-23 14:47:31,648 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-23 14:47:31,650 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-23 14:47:31,651 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-23 14:47:31,654 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-23 14:47:31,655 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-23 14:47:31,655 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-23 14:47:31,656 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-23 14:47:31,657 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-23 14:47:31,658 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-23 14:47:31,659 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-23 14:47:31,660 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-23 14:47:31,661 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-23 14:47:31,662 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-23 14:47:31,663 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-23 14:47:31,663 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-23 14:47:31,664 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-23 14:47:31,664 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-23 14:47:31,665 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-23 14:47:31,666 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-23 14:47:31,667 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-23 14:47:31,668 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2022-11-23 14:47:31,693 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-23 14:47:31,693 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-23 14:47:31,694 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-23 14:47:31,694 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-23 14:47:31,695 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-23 14:47:31,695 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-23 14:47:31,695 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-23 14:47:31,695 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-23 14:47:31,696 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-23 14:47:31,696 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-23 14:47:31,696 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-23 14:47:31,697 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-23 14:47:31,697 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-23 14:47:31,697 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-23 14:47:31,697 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-23 14:47:31,698 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-23 14:47:31,698 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-23 14:47:31,698 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-23 14:47:31,699 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2022-11-23 14:47:31,699 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2022-11-23 14:47:31,700 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-23 14:47:31,700 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-23 14:47:31,700 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2022-11-23 14:47:31,700 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-23 14:47:31,701 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-23 14:47:31,701 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-23 14:47:31,701 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2022-11-23 14:47:31,702 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2022-11-23 14:47:31,702 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2022-11-23 14:47:31,702 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-23 14:47:31,702 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2022-11-23 14:47:31,703 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-23 14:47:31,703 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-23 14:47:31,703 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-23 14:47:31,703 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-23 14:47:31,704 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:47:31,704 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-23 14:47:31,704 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-23 14:47:31,705 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-23 14:47:31,705 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-23 14:47:31,705 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-23 14:47:31,705 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-23 14:47:31,706 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_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c2e0266b63b958a771d0226973905d5a39a7a28d05d194ae66381394d9ab520a [2022-11-23 14:47:32,065 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-23 14:47:32,108 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-23 14:47:32,112 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-23 14:47:32,114 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-23 14:47:32,114 INFO L275 PluginConnector]: CDTParser initialized [2022-11-23 14:47:32,116 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/../../sv-benchmarks/c/heap-manipulation/dancing.i [2022-11-23 14:47:35,363 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-11-23 14:47:35,698 INFO L351 CDTParser]: Found 1 translation units. [2022-11-23 14:47:35,699 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/sv-benchmarks/c/heap-manipulation/dancing.i [2022-11-23 14:47:35,718 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/data/b7961cf22/c5e98a299772484c827038cfd8454061/FLAGe8c28dab8 [2022-11-23 14:47:35,749 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/data/b7961cf22/c5e98a299772484c827038cfd8454061 [2022-11-23 14:47:35,754 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-23 14:47:35,756 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-23 14:47:35,759 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-23 14:47:35,760 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-23 14:47:35,765 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-23 14:47:35,768 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:47:35" (1/1) ... [2022-11-23 14:47:35,769 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d2af530 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:35, skipping insertion in model container [2022-11-23 14:47:35,769 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:47:35" (1/1) ... [2022-11-23 14:47:35,778 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-23 14:47:35,843 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-23 14:47:36,098 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_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/sv-benchmarks/c/heap-manipulation/dancing.i[938,951] [2022-11-23 14:47:36,254 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:47:36,268 INFO L203 MainTranslator]: Completed pre-run [2022-11-23 14:47:36,283 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_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/sv-benchmarks/c/heap-manipulation/dancing.i[938,951] [2022-11-23 14:47:36,313 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-23 14:47:36,342 INFO L208 MainTranslator]: Completed translation [2022-11-23 14:47:36,343 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:36 WrapperNode [2022-11-23 14:47:36,343 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-23 14:47:36,344 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-23 14:47:36,344 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-23 14:47:36,345 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-23 14:47:36,354 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:36" (1/1) ... [2022-11-23 14:47:36,376 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:36" (1/1) ... [2022-11-23 14:47:36,404 INFO L138 Inliner]: procedures = 124, calls = 40, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 90 [2022-11-23 14:47:36,405 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-23 14:47:36,406 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-23 14:47:36,406 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-23 14:47:36,406 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-23 14:47:36,418 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:36" (1/1) ... [2022-11-23 14:47:36,418 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:36" (1/1) ... [2022-11-23 14:47:36,422 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:36" (1/1) ... [2022-11-23 14:47:36,423 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:36" (1/1) ... [2022-11-23 14:47:36,434 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:36" (1/1) ... [2022-11-23 14:47:36,440 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:36" (1/1) ... [2022-11-23 14:47:36,442 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:36" (1/1) ... [2022-11-23 14:47:36,444 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:36" (1/1) ... [2022-11-23 14:47:36,447 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-23 14:47:36,448 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-23 14:47:36,449 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-23 14:47:36,449 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-23 14:47:36,450 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:36" (1/1) ... [2022-11-23 14:47:36,458 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-23 14:47:36,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:47:36,487 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-23 14:47:36,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-23 14:47:36,528 INFO L130 BoogieDeclarations]: Found specification of procedure is_list_containing_x [2022-11-23 14:47:36,529 INFO L138 BoogieDeclarations]: Found implementation of procedure is_list_containing_x [2022-11-23 14:47:36,529 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2022-11-23 14:47:36,529 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2022-11-23 14:47:36,529 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2022-11-23 14:47:36,529 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-23 14:47:36,529 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2022-11-23 14:47:36,530 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2022-11-23 14:47:36,530 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2022-11-23 14:47:36,530 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2022-11-23 14:47:36,530 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-23 14:47:36,530 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-23 14:47:36,531 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-23 14:47:36,705 INFO L235 CfgBuilder]: Building ICFG [2022-11-23 14:47:36,708 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-23 14:47:37,261 INFO L276 CfgBuilder]: Performing block encoding [2022-11-23 14:47:37,335 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-23 14:47:37,335 INFO L300 CfgBuilder]: Removed 1 assume(true) statements. [2022-11-23 14:47:37,338 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:47:37 BoogieIcfgContainer [2022-11-23 14:47:37,338 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-23 14:47:37,341 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-23 14:47:37,342 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-23 14:47:37,345 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-23 14:47:37,345 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:47:35" (1/3) ... [2022-11-23 14:47:37,346 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e59ca21 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:47:37, skipping insertion in model container [2022-11-23 14:47:37,346 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:47:36" (2/3) ... [2022-11-23 14:47:37,347 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e59ca21 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:47:37, skipping insertion in model container [2022-11-23 14:47:37,347 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:47:37" (3/3) ... [2022-11-23 14:47:37,349 INFO L112 eAbstractionObserver]: Analyzing ICFG dancing.i [2022-11-23 14:47:37,371 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-23 14:47:37,371 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 44 error locations. [2022-11-23 14:47:37,447 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-23 14:47:37,459 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;@52a5836c, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-23 14:47:37,463 INFO L358 AbstractCegarLoop]: Starting to check reachability of 44 error locations. [2022-11-23 14:47:37,470 INFO L276 IsEmpty]: Start isEmpty. Operand has 98 states, 45 states have (on average 2.2) internal successors, (99), 89 states have internal predecessors, (99), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:47:37,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-11-23 14:47:37,478 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:37,479 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-11-23 14:47:37,480 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:47:37,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:37,493 INFO L85 PathProgramCache]: Analyzing trace with hash 6700, now seen corresponding path program 1 times [2022-11-23 14:47:37,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:37,505 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [302959889] [2022-11-23 14:47:37,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:37,506 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:37,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:37,750 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:37,750 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:37,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [302959889] [2022-11-23 14:47:37,752 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [302959889] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:37,752 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:47:37,752 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-23 14:47:37,754 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1319893376] [2022-11-23 14:47:37,758 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:37,763 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 14:47:37,765 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:37,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 14:47:37,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:47:37,807 INFO L87 Difference]: Start difference. First operand has 98 states, 45 states have (on average 2.2) internal successors, (99), 89 states have internal predecessors, (99), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:47:37,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:37,995 INFO L93 Difference]: Finished difference Result 96 states and 108 transitions. [2022-11-23 14:47:38,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 14:47:38,002 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 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 2 [2022-11-23 14:47:38,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:38,013 INFO L225 Difference]: With dead ends: 96 [2022-11-23 14:47:38,014 INFO L226 Difference]: Without dead ends: 95 [2022-11-23 14:47:38,016 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:47:38,022 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 73 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 78 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:38,024 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [78 Valid, 79 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:47:38,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2022-11-23 14:47:38,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2022-11-23 14:47:38,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 45 states have (on average 2.111111111111111) internal successors, (95), 86 states have internal predecessors, (95), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:47:38,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 107 transitions. [2022-11-23 14:47:38,080 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 107 transitions. Word has length 2 [2022-11-23 14:47:38,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:38,081 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 107 transitions. [2022-11-23 14:47:38,081 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:47:38,081 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 107 transitions. [2022-11-23 14:47:38,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3 [2022-11-23 14:47:38,082 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:38,082 INFO L195 NwaCegarLoop]: trace histogram [1, 1] [2022-11-23 14:47:38,082 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-23 14:47:38,083 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:47:38,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:38,084 INFO L85 PathProgramCache]: Analyzing trace with hash 6701, now seen corresponding path program 1 times [2022-11-23 14:47:38,084 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:38,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1340435250] [2022-11-23 14:47:38,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:38,085 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:38,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:38,184 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:38,184 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:38,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1340435250] [2022-11-23 14:47:38,185 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1340435250] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:38,185 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:47:38,185 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2022-11-23 14:47:38,185 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [76511484] [2022-11-23 14:47:38,186 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:38,187 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 14:47:38,187 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:38,188 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 14:47:38,188 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:47:38,189 INFO L87 Difference]: Start difference. First operand 95 states and 107 transitions. Second operand has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:47:38,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:38,414 INFO L93 Difference]: Finished difference Result 152 states and 175 transitions. [2022-11-23 14:47:38,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 14:47:38,415 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 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 2 [2022-11-23 14:47:38,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:38,417 INFO L225 Difference]: With dead ends: 152 [2022-11-23 14:47:38,417 INFO L226 Difference]: Without dead ends: 152 [2022-11-23 14:47:38,417 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:47:38,419 INFO L413 NwaCegarLoop]: 107 mSDtfsCounter, 60 mSDsluCounter, 56 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:38,420 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 163 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:47:38,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2022-11-23 14:47:38,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 93. [2022-11-23 14:47:38,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 45 states have (on average 2.066666666666667) internal successors, (93), 84 states have internal predecessors, (93), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:47:38,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 105 transitions. [2022-11-23 14:47:38,436 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 105 transitions. Word has length 2 [2022-11-23 14:47:38,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:38,437 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 105 transitions. [2022-11-23 14:47:38,437 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.0) internal successors, (2), 2 states have internal predecessors, (2), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:47:38,437 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 105 transitions. [2022-11-23 14:47:38,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-23 14:47:38,438 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:38,438 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-23 14:47:38,438 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-23 14:47:38,439 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:47:38,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:38,440 INFO L85 PathProgramCache]: Analyzing trace with hash 1897110090, now seen corresponding path program 1 times [2022-11-23 14:47:38,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:38,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2045526863] [2022-11-23 14:47:38,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:38,441 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:38,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:38,603 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:38,604 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:38,604 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2045526863] [2022-11-23 14:47:38,604 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2045526863] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:38,605 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:47:38,605 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 14:47:38,605 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869258897] [2022-11-23 14:47:38,605 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:38,606 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 14:47:38,606 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:38,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 14:47:38,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:47:38,607 INFO L87 Difference]: Start difference. First operand 93 states and 105 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 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) [2022-11-23 14:47:38,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:38,877 INFO L93 Difference]: Finished difference Result 150 states and 173 transitions. [2022-11-23 14:47:38,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 14:47:38,878 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 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 [2022-11-23 14:47:38,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:38,884 INFO L225 Difference]: With dead ends: 150 [2022-11-23 14:47:38,884 INFO L226 Difference]: Without dead ends: 150 [2022-11-23 14:47:38,889 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 [2022-11-23 14:47:38,893 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 66 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:38,895 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [71 Valid, 119 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:47:38,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2022-11-23 14:47:38,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 91. [2022-11-23 14:47:38,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 45 states have (on average 2.022222222222222) internal successors, (91), 82 states have internal predecessors, (91), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:47:38,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 103 transitions. [2022-11-23 14:47:38,907 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 103 transitions. Word has length 6 [2022-11-23 14:47:38,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:38,908 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 103 transitions. [2022-11-23 14:47:38,908 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 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) [2022-11-23 14:47:38,908 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 103 transitions. [2022-11-23 14:47:38,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2022-11-23 14:47:38,909 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:38,909 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2022-11-23 14:47:38,909 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-11-23 14:47:38,909 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:47:38,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:38,910 INFO L85 PathProgramCache]: Analyzing trace with hash 1897110091, now seen corresponding path program 1 times [2022-11-23 14:47:38,910 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:38,911 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1835957115] [2022-11-23 14:47:38,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:38,911 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:38,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:39,033 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:39,033 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:39,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1835957115] [2022-11-23 14:47:39,034 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1835957115] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:39,034 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:47:39,034 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 14:47:39,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863384869] [2022-11-23 14:47:39,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:39,035 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 14:47:39,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:39,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 14:47:39,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:47:39,036 INFO L87 Difference]: Start difference. First operand 91 states and 103 transitions. Second operand has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 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) [2022-11-23 14:47:39,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:39,172 INFO L93 Difference]: Finished difference Result 150 states and 172 transitions. [2022-11-23 14:47:39,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 14:47:39,173 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 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 [2022-11-23 14:47:39,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:39,174 INFO L225 Difference]: With dead ends: 150 [2022-11-23 14:47:39,174 INFO L226 Difference]: Without dead ends: 150 [2022-11-23 14:47:39,174 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 [2022-11-23 14:47:39,175 INFO L413 NwaCegarLoop]: 95 mSDtfsCounter, 66 mSDsluCounter, 54 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 71 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 85 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:39,176 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [71 Valid, 149 Invalid, 85 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:47:39,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2022-11-23 14:47:39,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 89. [2022-11-23 14:47:39,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 45 states have (on average 1.9777777777777779) internal successors, (89), 80 states have internal predecessors, (89), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:47:39,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 101 transitions. [2022-11-23 14:47:39,184 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 101 transitions. Word has length 6 [2022-11-23 14:47:39,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:39,184 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 101 transitions. [2022-11-23 14:47:39,185 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.0) internal successors, (6), 3 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) [2022-11-23 14:47:39,185 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 101 transitions. [2022-11-23 14:47:39,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-23 14:47:39,185 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:39,186 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:39,186 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-23 14:47:39,186 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:47:39,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:39,187 INFO L85 PathProgramCache]: Analyzing trace with hash -2076841129, now seen corresponding path program 1 times [2022-11-23 14:47:39,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:39,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618446865] [2022-11-23 14:47:39,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:39,187 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:39,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:39,287 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:39,288 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:39,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618446865] [2022-11-23 14:47:39,288 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [618446865] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:39,288 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:47:39,288 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:47:39,289 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843551295] [2022-11-23 14:47:39,289 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:39,289 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:47:39,289 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:39,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:47:39,290 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:47:39,290 INFO L87 Difference]: Start difference. First operand 89 states and 101 transitions. Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:47:39,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:39,406 INFO L93 Difference]: Finished difference Result 160 states and 186 transitions. [2022-11-23 14:47:39,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:47:39,406 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-23 14:47:39,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:39,409 INFO L225 Difference]: With dead ends: 160 [2022-11-23 14:47:39,409 INFO L226 Difference]: Without dead ends: 160 [2022-11-23 14:47:39,409 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:47:39,410 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 70 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 335 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:39,411 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 335 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:47:39,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-11-23 14:47:39,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 123. [2022-11-23 14:47:39,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 74 states have (on average 2.0675675675675675) internal successors, (153), 110 states have internal predecessors, (153), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-23 14:47:39,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 173 transitions. [2022-11-23 14:47:39,422 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 173 transitions. Word has length 8 [2022-11-23 14:47:39,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:39,423 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 173 transitions. [2022-11-23 14:47:39,423 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:47:39,423 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 173 transitions. [2022-11-23 14:47:39,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-23 14:47:39,424 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:39,424 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:39,424 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-11-23 14:47:39,425 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:47:39,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:39,425 INFO L85 PathProgramCache]: Analyzing trace with hash 2056662894, now seen corresponding path program 1 times [2022-11-23 14:47:39,425 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:39,426 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479869187] [2022-11-23 14:47:39,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:39,426 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:39,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:39,613 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:39,614 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:39,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479869187] [2022-11-23 14:47:39,614 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479869187] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:39,614 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:47:39,614 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-11-23 14:47:39,615 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129289086] [2022-11-23 14:47:39,615 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:39,615 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 14:47:39,615 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:39,616 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 14:47:39,616 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:47:39,616 INFO L87 Difference]: Start difference. First operand 123 states and 173 transitions. Second operand has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:47:39,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:39,789 INFO L93 Difference]: Finished difference Result 122 states and 172 transitions. [2022-11-23 14:47:39,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 14:47:39,790 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-23 14:47:39,790 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:39,791 INFO L225 Difference]: With dead ends: 122 [2022-11-23 14:47:39,792 INFO L226 Difference]: Without dead ends: 122 [2022-11-23 14:47:39,792 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 [2022-11-23 14:47:39,795 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 128 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:39,800 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [128 Valid, 93 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:47:39,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2022-11-23 14:47:39,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 122. [2022-11-23 14:47:39,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 74 states have (on average 2.054054054054054) internal successors, (152), 109 states have internal predecessors, (152), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-23 14:47:39,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 172 transitions. [2022-11-23 14:47:39,827 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 172 transitions. Word has length 8 [2022-11-23 14:47:39,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:39,828 INFO L495 AbstractCegarLoop]: Abstraction has 122 states and 172 transitions. [2022-11-23 14:47:39,828 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:47:39,828 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 172 transitions. [2022-11-23 14:47:39,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-11-23 14:47:39,829 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:39,829 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:39,829 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2022-11-23 14:47:39,830 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:47:39,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:39,832 INFO L85 PathProgramCache]: Analyzing trace with hash 2056662893, now seen corresponding path program 1 times [2022-11-23 14:47:39,832 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:39,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1453138936] [2022-11-23 14:47:39,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:39,833 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:39,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:40,051 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:40,052 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:40,052 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1453138936] [2022-11-23 14:47:40,052 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1453138936] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:40,052 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:47:40,053 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 14:47:40,053 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481711994] [2022-11-23 14:47:40,054 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:40,055 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:47:40,055 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:40,056 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:47:40,056 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:47:40,056 INFO L87 Difference]: Start difference. First operand 122 states and 172 transitions. Second operand has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:47:40,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:40,185 INFO L93 Difference]: Finished difference Result 121 states and 171 transitions. [2022-11-23 14:47:40,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-11-23 14:47:40,185 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-11-23 14:47:40,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:40,188 INFO L225 Difference]: With dead ends: 121 [2022-11-23 14:47:40,188 INFO L226 Difference]: Without dead ends: 121 [2022-11-23 14:47:40,189 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:47:40,192 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 127 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 127 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:40,193 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [127 Valid, 108 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:47:40,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2022-11-23 14:47:40,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2022-11-23 14:47:40,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 74 states have (on average 2.0405405405405403) internal successors, (151), 108 states have internal predecessors, (151), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-23 14:47:40,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 171 transitions. [2022-11-23 14:47:40,214 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 171 transitions. Word has length 8 [2022-11-23 14:47:40,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:40,215 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 171 transitions. [2022-11-23 14:47:40,215 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:47:40,215 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 171 transitions. [2022-11-23 14:47:40,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-23 14:47:40,216 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:40,216 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:40,217 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2022-11-23 14:47:40,217 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:47:40,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:40,218 INFO L85 PathProgramCache]: Analyzing trace with hash 2124365722, now seen corresponding path program 1 times [2022-11-23 14:47:40,218 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:40,218 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136721330] [2022-11-23 14:47:40,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:40,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:40,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:40,320 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:40,320 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:40,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136721330] [2022-11-23 14:47:40,320 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136721330] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:40,321 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:47:40,321 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:47:40,321 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079681797] [2022-11-23 14:47:40,321 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:40,322 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 14:47:40,324 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:40,325 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 14:47:40,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:47:40,325 INFO L87 Difference]: Start difference. First operand 121 states and 171 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:47:40,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:40,607 INFO L93 Difference]: Finished difference Result 143 states and 166 transitions. [2022-11-23 14:47:40,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:47:40,608 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-11-23 14:47:40,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:40,611 INFO L225 Difference]: With dead ends: 143 [2022-11-23 14:47:40,611 INFO L226 Difference]: Without dead ends: 143 [2022-11-23 14:47:40,613 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2022-11-23 14:47:40,617 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 323 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 130 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 325 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 172 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 130 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:40,617 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [325 Valid, 132 Invalid, 172 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 130 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:47:40,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2022-11-23 14:47:40,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 116. [2022-11-23 14:47:40,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 74 states have (on average 1.8918918918918919) internal successors, (140), 103 states have internal predecessors, (140), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-23 14:47:40,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 160 transitions. [2022-11-23 14:47:40,630 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 160 transitions. Word has length 11 [2022-11-23 14:47:40,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:40,630 INFO L495 AbstractCegarLoop]: Abstraction has 116 states and 160 transitions. [2022-11-23 14:47:40,631 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:47:40,631 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 160 transitions. [2022-11-23 14:47:40,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-11-23 14:47:40,631 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:40,632 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:40,632 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2022-11-23 14:47:40,632 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:47:40,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:40,634 INFO L85 PathProgramCache]: Analyzing trace with hash 2124365723, now seen corresponding path program 1 times [2022-11-23 14:47:40,634 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:40,634 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [955539067] [2022-11-23 14:47:40,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:40,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:40,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:40,897 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:40,897 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:40,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [955539067] [2022-11-23 14:47:40,898 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [955539067] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:40,898 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:47:40,898 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:47:40,898 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612536662] [2022-11-23 14:47:40,899 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:40,899 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 14:47:40,900 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:40,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 14:47:40,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:47:40,901 INFO L87 Difference]: Start difference. First operand 116 states and 160 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:47:41,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:41,238 INFO L93 Difference]: Finished difference Result 139 states and 161 transitions. [2022-11-23 14:47:41,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:47:41,264 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2022-11-23 14:47:41,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:41,265 INFO L225 Difference]: With dead ends: 139 [2022-11-23 14:47:41,265 INFO L226 Difference]: Without dead ends: 139 [2022-11-23 14:47:41,265 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2022-11-23 14:47:41,265 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 256 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:41,266 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [262 Valid, 157 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 158 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:47:41,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2022-11-23 14:47:41,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 116. [2022-11-23 14:47:41,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 116 states, 74 states have (on average 1.8108108108108107) internal successors, (134), 103 states have internal predecessors, (134), 10 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10) [2022-11-23 14:47:41,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 154 transitions. [2022-11-23 14:47:41,271 INFO L78 Accepts]: Start accepts. Automaton has 116 states and 154 transitions. Word has length 11 [2022-11-23 14:47:41,271 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:41,271 INFO L495 AbstractCegarLoop]: Abstraction has 116 states and 154 transitions. [2022-11-23 14:47:41,272 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:47:41,272 INFO L276 IsEmpty]: Start isEmpty. Operand 116 states and 154 transitions. [2022-11-23 14:47:41,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-23 14:47:41,272 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:41,272 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:41,273 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2022-11-23 14:47:41,273 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:47:41,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:41,274 INFO L85 PathProgramCache]: Analyzing trace with hash -1159058315, now seen corresponding path program 1 times [2022-11-23 14:47:41,274 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:41,274 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1045445749] [2022-11-23 14:47:41,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:41,274 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:41,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:41,368 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:41,368 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:41,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1045445749] [2022-11-23 14:47:41,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1045445749] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:47:41,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554170954] [2022-11-23 14:47:41,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:41,369 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:41,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:47:41,372 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:47:41,381 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-23 14:47:41,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:41,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 11 conjunts are in the unsatisfiable core [2022-11-23 14:47:41,529 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:47:41,591 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 [2022-11-23 14:47:41,642 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-23 14:47:41,643 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 [2022-11-23 14:47:41,710 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:47:41,711 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:47:41,711 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1554170954] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:41,712 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 14:47:41,712 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 5 [2022-11-23 14:47:41,712 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [70757211] [2022-11-23 14:47:41,712 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:41,713 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:47:41,713 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:41,714 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:47:41,714 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:47:41,714 INFO L87 Difference]: Start difference. First operand 116 states and 154 transitions. Second operand has 5 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:47:41,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:41,942 INFO L93 Difference]: Finished difference Result 128 states and 169 transitions. [2022-11-23 14:47:41,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:47:41,942 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-23 14:47:41,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:41,944 INFO L225 Difference]: With dead ends: 128 [2022-11-23 14:47:41,944 INFO L226 Difference]: Without dead ends: 128 [2022-11-23 14:47:41,944 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 12 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-11-23 14:47:41,945 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 79 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 166 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 137 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:41,945 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 137 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 166 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:47:41,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2022-11-23 14:47:41,950 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 124. [2022-11-23 14:47:41,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 81 states have (on average 1.7777777777777777) internal successors, (144), 109 states have internal predecessors, (144), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-23 14:47:41,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 166 transitions. [2022-11-23 14:47:41,952 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 166 transitions. Word has length 13 [2022-11-23 14:47:41,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:41,952 INFO L495 AbstractCegarLoop]: Abstraction has 124 states and 166 transitions. [2022-11-23 14:47:41,953 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:47:41,953 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 166 transitions. [2022-11-23 14:47:41,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-11-23 14:47:41,954 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:41,954 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:41,962 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-23 14:47:42,161 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:42,161 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:47:42,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:42,162 INFO L85 PathProgramCache]: Analyzing trace with hash -1159058314, now seen corresponding path program 1 times [2022-11-23 14:47:42,162 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:42,162 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1101241790] [2022-11-23 14:47:42,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:42,162 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:42,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:42,411 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:42,411 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:42,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1101241790] [2022-11-23 14:47:42,412 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1101241790] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:47:42,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [180916210] [2022-11-23 14:47:42,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:42,412 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:42,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:47:42,414 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:47:42,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-23 14:47:42,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:42,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 14 conjunts are in the unsatisfiable core [2022-11-23 14:47:42,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:47:42,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:42,626 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 [2022-11-23 14:47:42,733 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:42,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:47:42,945 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 37 [2022-11-23 14:47:42,993 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:42,994 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [180916210] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:47:42,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1660965306] [2022-11-23 14:47:43,016 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-11-23 14:47:43,017 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:47:43,021 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:47:43,030 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:47:43,030 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:47:43,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,092 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 [2022-11-23 14:47:43,121 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 11 treesize of output 7 [2022-11-23 14:47:43,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,134 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 30 treesize of output 21 [2022-11-23 14:47:43,146 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 [2022-11-23 14:47:43,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,172 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 [2022-11-23 14:47:43,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,186 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 21 treesize of output 20 [2022-11-23 14:47:43,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,203 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 21 treesize of output 20 [2022-11-23 14:47:43,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,248 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 29 treesize of output 35 [2022-11-23 14:47:43,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,292 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 30 treesize of output 21 [2022-11-23 14:47:43,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,310 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:47:43,326 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,329 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:47:43,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,380 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:47:43,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,398 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 [2022-11-23 14:47:43,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,421 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:47:43,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,498 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:43,500 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:47:43,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,520 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 [2022-11-23 14:47:43,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,543 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:43,545 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:47:43,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,642 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,655 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 54 [2022-11-23 14:47:43,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,734 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 30 treesize of output 21 [2022-11-23 14:47:43,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,765 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:43,790 INFO L321 Elim1Store]: treesize reduction 33, result has 17.5 percent of original size [2022-11-23 14:47:43,790 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 188 treesize of output 133 [2022-11-23 14:47:43,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:43,828 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 62 [2022-11-23 14:47:43,913 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:47:43,922 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:47:43,934 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:47:43,972 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:43,985 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:47:43,985 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 23 treesize of output 22 [2022-11-23 14:47:44,035 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:47:44,047 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:44,064 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:47:44,065 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 23 treesize of output 26 [2022-11-23 14:47:44,171 INFO L321 Elim1Store]: treesize reduction 32, result has 58.4 percent of original size [2022-11-23 14:47:44,172 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 3 case distinctions, treesize of input 33 treesize of output 66 [2022-11-23 14:47:44,264 INFO L321 Elim1Store]: treesize reduction 68, result has 31.3 percent of original size [2022-11-23 14:47:44,265 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 5 case distinctions, treesize of input 28 treesize of output 45 [2022-11-23 14:47:44,366 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 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 [2022-11-23 14:47:44,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:44,384 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:44,390 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-23 14:47:44,391 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 246 treesize of output 197 [2022-11-23 14:47:44,416 INFO L321 Elim1Store]: treesize reduction 19, result has 5.0 percent of original size [2022-11-23 14:47:44,417 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 243 treesize of output 194 [2022-11-23 14:47:44,480 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:47:44,489 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:47:44,502 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:47:44,528 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:47:44,537 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:44,548 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:47:44,549 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 23 treesize of output 22 [2022-11-23 14:47:44,599 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:44,617 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:47:44,617 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 23 treesize of output 26 [2022-11-23 14:47:44,703 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 [2022-11-23 14:47:44,711 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 [2022-11-23 14:47:44,721 INFO L197 IcfgInterpreter]: Interpreting procedure is_list_containing_x with input of size 15 for LOIs [2022-11-23 14:47:44,733 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:47:45,578 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2733#(and (<= |is_list_containing_x_#in~x.offset| 0) (<= 0 |is_list_containing_x_#in~x.offset|) (= |is_list_containing_x_#in~x.offset| is_list_containing_x_~x.offset) (= is_list_containing_x_~x.base |is_list_containing_x_#in~x.base|) (= |is_list_containing_x_#in~l.offset| is_list_containing_x_~l.offset) (= |#NULL.offset| 0) (= |is_list_containing_x_#in~l.offset| 0) (not (<= (+ is_list_containing_x_~l.offset 8) (select |#length| is_list_containing_x_~l.base))) (= is_list_containing_x_~l.base |is_list_containing_x_#in~l.base|) (<= 0 |#StackHeapBarrier|) (<= 0 |is_list_containing_x_#in~l.base|) (= |#NULL.base| 0) (not (= is_list_containing_x_~l.base is_list_containing_x_~x.base)))' at error location [2022-11-23 14:47:45,578 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:47:45,578 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:47:45,578 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 12 [2022-11-23 14:47:45,579 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376729642] [2022-11-23 14:47:45,579 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:47:45,579 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-23 14:47:45,579 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:45,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-23 14:47:45,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2022-11-23 14:47:45,580 INFO L87 Difference]: Start difference. First operand 124 states and 166 transitions. Second operand has 13 states, 12 states have (on average 2.6666666666666665) internal successors, (32), 11 states have internal predecessors, (32), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:47:46,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:46,002 INFO L93 Difference]: Finished difference Result 125 states and 166 transitions. [2022-11-23 14:47:46,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 14:47:46,003 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 2.6666666666666665) internal successors, (32), 11 states have internal predecessors, (32), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-11-23 14:47:46,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:46,004 INFO L225 Difference]: With dead ends: 125 [2022-11-23 14:47:46,004 INFO L226 Difference]: Without dead ends: 125 [2022-11-23 14:47:46,005 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=93, Invalid=507, Unknown=0, NotChecked=0, Total=600 [2022-11-23 14:47:46,005 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 309 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 358 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 310 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 358 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:46,006 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [310 Valid, 269 Invalid, 395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 358 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 14:47:46,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2022-11-23 14:47:46,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 123. [2022-11-23 14:47:46,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 123 states, 81 states have (on average 1.7407407407407407) internal successors, (141), 108 states have internal predecessors, (141), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-23 14:47:46,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 163 transitions. [2022-11-23 14:47:46,015 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 163 transitions. Word has length 13 [2022-11-23 14:47:46,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:46,015 INFO L495 AbstractCegarLoop]: Abstraction has 123 states and 163 transitions. [2022-11-23 14:47:46,015 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 2.6666666666666665) internal successors, (32), 11 states have internal predecessors, (32), 2 states have call successors, (2), 2 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:47:46,016 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 163 transitions. [2022-11-23 14:47:46,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-11-23 14:47:46,018 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:46,018 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:46,029 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-23 14:47:46,223 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-11-23 14:47:46,224 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:47:46,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:46,224 INFO L85 PathProgramCache]: Analyzing trace with hash -1754391202, now seen corresponding path program 1 times [2022-11-23 14:47:46,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:46,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11383313] [2022-11-23 14:47:46,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:46,225 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:46,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:46,416 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:46,417 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:46,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11383313] [2022-11-23 14:47:46,417 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [11383313] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:46,417 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:47:46,417 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-23 14:47:46,418 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5146464] [2022-11-23 14:47:46,418 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:46,418 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 14:47:46,418 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:46,419 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 14:47:46,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:47:46,419 INFO L87 Difference]: Start difference. First operand 123 states and 163 transitions. Second operand has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:47:46,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:46,643 INFO L93 Difference]: Finished difference Result 155 states and 196 transitions. [2022-11-23 14:47:46,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:47:46,643 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2022-11-23 14:47:46,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:46,644 INFO L225 Difference]: With dead ends: 155 [2022-11-23 14:47:46,644 INFO L226 Difference]: Without dead ends: 155 [2022-11-23 14:47:46,644 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-23 14:47:46,645 INFO L413 NwaCegarLoop]: 79 mSDtfsCounter, 79 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 147 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 335 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 147 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:46,645 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [80 Valid, 335 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 147 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:47:46,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-11-23 14:47:46,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 120. [2022-11-23 14:47:46,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 78 states have (on average 1.7307692307692308) internal successors, (135), 105 states have internal predecessors, (135), 11 states have call successors, (11), 4 states have call predecessors, (11), 4 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2022-11-23 14:47:46,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 157 transitions. [2022-11-23 14:47:46,650 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 157 transitions. Word has length 15 [2022-11-23 14:47:46,651 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:46,651 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 157 transitions. [2022-11-23 14:47:46,651 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:47:46,651 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 157 transitions. [2022-11-23 14:47:46,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-23 14:47:46,652 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:46,652 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:46,652 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2022-11-23 14:47:46,653 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:47:46,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:46,653 INFO L85 PathProgramCache]: Analyzing trace with hash 2030371260, now seen corresponding path program 1 times [2022-11-23 14:47:46,653 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:46,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1513030688] [2022-11-23 14:47:46,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:46,654 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:46,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:46,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:46,782 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:46,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1513030688] [2022-11-23 14:47:46,783 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1513030688] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:47:46,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [534150645] [2022-11-23 14:47:46,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:46,783 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:46,783 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:47:46,784 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:47:46,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-23 14:47:46,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:46,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 19 conjunts are in the unsatisfiable core [2022-11-23 14:47:46,899 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:47:47,060 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:47,060 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:47:47,159 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-23 14:47:47,159 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 [2022-11-23 14:47:47,169 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:47,169 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [534150645] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:47:47,169 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1431801417] [2022-11-23 14:47:47,172 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 14:47:47,172 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:47:47,172 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:47:47,173 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:47:47,173 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:47:47,190 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,193 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 [2022-11-23 14:47:47,211 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 [2022-11-23 14:47:47,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,220 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 30 treesize of output 21 [2022-11-23 14:47:47,230 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 [2022-11-23 14:47:47,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,252 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 21 treesize of output 20 [2022-11-23 14:47:47,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,264 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 [2022-11-23 14:47:47,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,280 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 21 treesize of output 20 [2022-11-23 14:47:47,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,322 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,325 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 29 treesize of output 35 [2022-11-23 14:47:47,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,369 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 30 treesize of output 21 [2022-11-23 14:47:47,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,385 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:47:47,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,404 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:47:47,439 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,440 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 [2022-11-23 14:47:47,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,462 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:47:47,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,490 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:47:47,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,534 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,536 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,541 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:47,543 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:47:47,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,566 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 [2022-11-23 14:47:47,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,588 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:47,590 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:47:47,661 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,665 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,668 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,672 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,674 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,676 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,680 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 54 [2022-11-23 14:47:47,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,745 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 30 treesize of output 21 [2022-11-23 14:47:47,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,772 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:47,825 INFO L321 Elim1Store]: treesize reduction 33, result has 17.5 percent of original size [2022-11-23 14:47:47,826 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 188 treesize of output 133 [2022-11-23 14:47:47,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,849 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:47,852 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 62 [2022-11-23 14:47:47,892 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:47:47,899 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:47:47,907 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:47:47,960 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:47:47,969 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:47,982 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:47:47,982 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 23 treesize of output 26 [2022-11-23 14:47:47,993 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:48,005 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:47:48,005 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 23 treesize of output 22 [2022-11-23 14:47:48,071 INFO L321 Elim1Store]: treesize reduction 32, result has 58.4 percent of original size [2022-11-23 14:47:48,071 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 3 case distinctions, treesize of input 33 treesize of output 66 [2022-11-23 14:47:48,151 INFO L321 Elim1Store]: treesize reduction 68, result has 31.3 percent of original size [2022-11-23 14:47:48,151 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 5 case distinctions, treesize of input 28 treesize of output 45 [2022-11-23 14:47:48,251 INFO L321 Elim1Store]: treesize reduction 19, result has 5.0 percent of original size [2022-11-23 14:47:48,252 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 190 treesize of output 147 [2022-11-23 14:47:48,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:48,273 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:48,279 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-23 14:47:48,280 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 217 treesize of output 168 [2022-11-23 14:47:48,315 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-23 14:47:48,339 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:47:48,348 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:47:48,366 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:47:48,428 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:48,444 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:47:48,445 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 23 treesize of output 22 [2022-11-23 14:47:48,491 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:47:48,503 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:48,545 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:47:48,545 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 23 treesize of output 26 [2022-11-23 14:47:48,775 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 [2022-11-23 14:47:48,795 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 [2022-11-23 14:47:48,819 INFO L197 IcfgInterpreter]: Interpreting procedure is_list_containing_x with input of size 15 for LOIs [2022-11-23 14:47:48,828 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:47:50,050 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3385#(and (= (mod (+ (* 255 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) 1) 256) 0) (<= 0 |ULTIMATE.start_main_~tail~0#1.base|) (= |ULTIMATE.start_remove_#in~x#1.offset| |ULTIMATE.start_main_~x~0#1.offset|) (= |ULTIMATE.start_main_~#list~0#1.base| |ULTIMATE.start_main_~x~0#1.base|) (<= 0 |ULTIMATE.start_main_~tail~0#1.offset|) (<= 0 |ULTIMATE.start_main_~x~0#1.offset|) (= |ULTIMATE.start_remove_#in~x#1.base| |ULTIMATE.start_main_~x~0#1.base|) (< |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 256) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#list~0#1.base|) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start_main_~#list~0#1.offset| 0) (= |ULTIMATE.start_main_~#list~0#1.offset| |ULTIMATE.start_main_~x~0#1.offset|) (= |ULTIMATE.start_remove_#in~x#1.offset| |ULTIMATE.start_remove_~x#1.offset|) (not (= (select |#valid| |ULTIMATE.start_remove_~x#1.base|) 1)) (= |ULTIMATE.start_remove_#in~x#1.base| |ULTIMATE.start_remove_~x#1.base|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (<= |ULTIMATE.start_main_~tail~0#1.offset| 0))' at error location [2022-11-23 14:47:50,051 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:47:50,051 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:47:50,051 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 7] total 12 [2022-11-23 14:47:50,052 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754936370] [2022-11-23 14:47:50,052 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:47:50,052 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-23 14:47:50,052 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:50,053 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-23 14:47:50,053 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=514, Unknown=0, NotChecked=0, Total=600 [2022-11-23 14:47:50,053 INFO L87 Difference]: Start difference. First operand 120 states and 157 transitions. Second operand has 13 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 1 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 14:47:50,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:50,624 INFO L93 Difference]: Finished difference Result 187 states and 241 transitions. [2022-11-23 14:47:50,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-23 14:47:50,625 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 1 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 16 [2022-11-23 14:47:50,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:50,627 INFO L225 Difference]: With dead ends: 187 [2022-11-23 14:47:50,627 INFO L226 Difference]: Without dead ends: 187 [2022-11-23 14:47:50,628 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 216 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=140, Invalid=852, Unknown=0, NotChecked=0, Total=992 [2022-11-23 14:47:50,628 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 488 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 353 mSolverCounterSat, 87 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 490 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 440 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 87 IncrementalHoareTripleChecker+Valid, 353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:50,628 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [490 Valid, 188 Invalid, 440 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [87 Valid, 353 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-11-23 14:47:50,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2022-11-23 14:47:50,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 158. [2022-11-23 14:47:50,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 110 states have (on average 1.7818181818181817) internal successors, (196), 138 states have internal predecessors, (196), 15 states have call successors, (15), 5 states have call predecessors, (15), 6 states have return successors, (20), 14 states have call predecessors, (20), 15 states have call successors, (20) [2022-11-23 14:47:50,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 231 transitions. [2022-11-23 14:47:50,638 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 231 transitions. Word has length 16 [2022-11-23 14:47:50,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:50,638 INFO L495 AbstractCegarLoop]: Abstraction has 158 states and 231 transitions. [2022-11-23 14:47:50,639 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 1.6666666666666667) internal successors, (20), 11 states have internal predecessors, (20), 1 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 14:47:50,639 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 231 transitions. [2022-11-23 14:47:50,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-11-23 14:47:50,639 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:50,639 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:50,663 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-23 14:47:50,840 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-23 14:47:50,840 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:47:50,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:50,841 INFO L85 PathProgramCache]: Analyzing trace with hash 2030371261, now seen corresponding path program 1 times [2022-11-23 14:47:50,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:50,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [947462234] [2022-11-23 14:47:50,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:50,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:50,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:51,084 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:51,084 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:51,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [947462234] [2022-11-23 14:47:51,085 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [947462234] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:47:51,085 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1455048730] [2022-11-23 14:47:51,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:51,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:51,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:47:51,086 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:47:51,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-23 14:47:51,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:51,209 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-23 14:47:51,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:47:51,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:51,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:47:51,637 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:47:51,637 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 22 treesize of output 26 [2022-11-23 14:47:51,725 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:51,725 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1455048730] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:47:51,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2053840382] [2022-11-23 14:47:51,728 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 14:47:51,728 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:47:51,729 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:47:51,729 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:47:51,729 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:47:51,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,746 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 [2022-11-23 14:47:51,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,768 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 30 treesize of output 21 [2022-11-23 14:47:51,776 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 [2022-11-23 14:47:51,783 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 [2022-11-23 14:47:51,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,809 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 21 treesize of output 20 [2022-11-23 14:47:51,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,823 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 21 treesize of output 20 [2022-11-23 14:47:51,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,837 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 [2022-11-23 14:47:51,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,882 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 29 treesize of output 35 [2022-11-23 14:47:51,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,914 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:47:51,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,928 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,929 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:47:51,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,945 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 30 treesize of output 21 [2022-11-23 14:47:51,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:51,972 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:47:52,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,018 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 [2022-11-23 14:47:52,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,034 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:47:52,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,080 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 [2022-11-23 14:47:52,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,095 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,096 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:52,100 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:47:52,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,120 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:52,123 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:47:52,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,181 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,187 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 49 [2022-11-23 14:47:52,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,248 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:52,265 INFO L321 Elim1Store]: treesize reduction 33, result has 17.5 percent of original size [2022-11-23 14:47:52,265 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 188 treesize of output 133 [2022-11-23 14:47:52,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,293 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 62 [2022-11-23 14:47:52,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,326 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 30 treesize of output 21 [2022-11-23 14:47:52,358 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:47:52,363 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:47:52,370 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:47:52,396 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:52,405 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:47:52,405 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 23 treesize of output 22 [2022-11-23 14:47:52,413 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:47:52,421 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:52,435 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:47:52,435 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 23 treesize of output 26 [2022-11-23 14:47:52,502 INFO L321 Elim1Store]: treesize reduction 32, result has 58.4 percent of original size [2022-11-23 14:47:52,502 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 3 case distinctions, treesize of input 33 treesize of output 66 [2022-11-23 14:47:52,596 INFO L321 Elim1Store]: treesize reduction 68, result has 31.3 percent of original size [2022-11-23 14:47:52,596 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 5 case distinctions, treesize of input 28 treesize of output 45 [2022-11-23 14:47:52,639 INFO L321 Elim1Store]: treesize reduction 19, result has 5.0 percent of original size [2022-11-23 14:47:52,640 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 172 treesize of output 147 [2022-11-23 14:47:52,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:52,653 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:52,658 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-23 14:47:52,659 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 184 treesize of output 141 [2022-11-23 14:47:52,680 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-23 14:47:52,694 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 13 treesize of output 9 [2022-11-23 14:47:52,700 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:47:52,707 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:47:52,733 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:52,746 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:47:52,747 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 23 treesize of output 26 [2022-11-23 14:47:52,760 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:47:52,772 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:47:52,772 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 23 treesize of output 22 [2022-11-23 14:47:52,784 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:47:52,959 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 [2022-11-23 14:47:52,966 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 [2022-11-23 14:47:52,974 INFO L197 IcfgInterpreter]: Interpreting procedure is_list_containing_x with input of size 15 for LOIs [2022-11-23 14:47:52,981 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:47:54,211 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3867#(and (= (mod (+ (* 255 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) 1) 256) 0) (<= 0 |ULTIMATE.start_main_~tail~0#1.base|) (= |ULTIMATE.start_remove_#in~x#1.offset| |ULTIMATE.start_main_~x~0#1.offset|) (= |ULTIMATE.start_main_~#list~0#1.base| |ULTIMATE.start_main_~x~0#1.base|) (<= 0 |ULTIMATE.start_main_~tail~0#1.offset|) (<= 0 |ULTIMATE.start_main_~x~0#1.offset|) (= |ULTIMATE.start_remove_#in~x#1.base| |ULTIMATE.start_main_~x~0#1.base|) (< |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 256) (<= |#NULL.offset| 0) (not (<= (+ 8 |ULTIMATE.start_remove_~x#1.offset|) (select |#length| |ULTIMATE.start_remove_~x#1.base|))) (<= 0 |ULTIMATE.start_main_~#list~0#1.base|) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= |ULTIMATE.start_main_~#list~0#1.offset| 0) (= |ULTIMATE.start_main_~#list~0#1.offset| |ULTIMATE.start_main_~x~0#1.offset|) (= |ULTIMATE.start_remove_#in~x#1.offset| |ULTIMATE.start_remove_~x#1.offset|) (= |ULTIMATE.start_remove_#in~x#1.base| |ULTIMATE.start_remove_~x#1.base|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (<= |ULTIMATE.start_main_~tail~0#1.offset| 0))' at error location [2022-11-23 14:47:54,212 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:47:54,212 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:47:54,212 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2022-11-23 14:47:54,212 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084997978] [2022-11-23 14:47:54,212 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:47:54,213 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-23 14:47:54,213 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:54,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-23 14:47:54,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=857, Unknown=0, NotChecked=0, Total=992 [2022-11-23 14:47:54,214 INFO L87 Difference]: Start difference. First operand 158 states and 231 transitions. Second operand has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 16 states have internal predecessors, (37), 2 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-23 14:47:55,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:55,602 INFO L93 Difference]: Finished difference Result 293 states and 413 transitions. [2022-11-23 14:47:55,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-11-23 14:47:55,603 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 16 states have internal predecessors, (37), 2 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 16 [2022-11-23 14:47:55,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:55,605 INFO L225 Difference]: With dead ends: 293 [2022-11-23 14:47:55,605 INFO L226 Difference]: Without dead ends: 293 [2022-11-23 14:47:55,606 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 508 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=275, Invalid=1617, Unknown=0, NotChecked=0, Total=1892 [2022-11-23 14:47:55,607 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 456 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 753 mSolverCounterSat, 131 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 458 SdHoareTripleChecker+Valid, 447 SdHoareTripleChecker+Invalid, 884 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 131 IncrementalHoareTripleChecker+Valid, 753 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:55,608 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [458 Valid, 447 Invalid, 884 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [131 Valid, 753 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-23 14:47:55,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 293 states. [2022-11-23 14:47:55,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 293 to 163. [2022-11-23 14:47:55,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 163 states, 117 states have (on average 1.6923076923076923) internal successors, (198), 142 states have internal predecessors, (198), 16 states have call successors, (16), 5 states have call predecessors, (16), 6 states have return successors, (22), 15 states have call predecessors, (22), 16 states have call successors, (22) [2022-11-23 14:47:55,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 236 transitions. [2022-11-23 14:47:55,625 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 236 transitions. Word has length 16 [2022-11-23 14:47:55,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:55,627 INFO L495 AbstractCegarLoop]: Abstraction has 163 states and 236 transitions. [2022-11-23 14:47:55,627 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.9473684210526316) internal successors, (37), 16 states have internal predecessors, (37), 2 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-23 14:47:55,628 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 236 transitions. [2022-11-23 14:47:55,629 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-23 14:47:55,629 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:55,629 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:55,643 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-23 14:47:55,839 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:55,840 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:47:55,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:55,840 INFO L85 PathProgramCache]: Analyzing trace with hash 472269758, now seen corresponding path program 1 times [2022-11-23 14:47:55,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:55,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1388359583] [2022-11-23 14:47:55,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:55,841 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:55,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:55,884 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:47:55,885 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:55,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1388359583] [2022-11-23 14:47:55,885 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1388359583] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:55,885 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:47:55,885 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-11-23 14:47:55,886 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754692619] [2022-11-23 14:47:55,886 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:55,887 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-11-23 14:47:55,887 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:55,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-11-23 14:47:55,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:47:55,888 INFO L87 Difference]: Start difference. First operand 163 states and 236 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:47:55,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:55,924 INFO L93 Difference]: Finished difference Result 174 states and 225 transitions. [2022-11-23 14:47:55,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-11-23 14:47:55,925 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-11-23 14:47:55,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:55,927 INFO L225 Difference]: With dead ends: 174 [2022-11-23 14:47:55,928 INFO L226 Difference]: Without dead ends: 174 [2022-11-23 14:47:55,929 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-11-23 14:47:55,930 INFO L413 NwaCegarLoop]: 123 mSDtfsCounter, 56 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:55,931 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 194 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:47:55,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2022-11-23 14:47:55,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 155. [2022-11-23 14:47:55,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 110 states have (on average 1.6818181818181819) internal successors, (185), 135 states have internal predecessors, (185), 15 states have call successors, (15), 5 states have call predecessors, (15), 6 states have return successors, (20), 14 states have call predecessors, (20), 15 states have call successors, (20) [2022-11-23 14:47:55,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 220 transitions. [2022-11-23 14:47:55,940 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 220 transitions. Word has length 17 [2022-11-23 14:47:55,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:55,940 INFO L495 AbstractCegarLoop]: Abstraction has 155 states and 220 transitions. [2022-11-23 14:47:55,940 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:47:55,941 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 220 transitions. [2022-11-23 14:47:55,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-11-23 14:47:55,944 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:55,944 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:55,944 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2022-11-23 14:47:55,944 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr24REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:47:55,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:55,945 INFO L85 PathProgramCache]: Analyzing trace with hash -1986748576, now seen corresponding path program 1 times [2022-11-23 14:47:55,945 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:55,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1372346488] [2022-11-23 14:47:55,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:55,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:55,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:56,156 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:56,156 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:56,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1372346488] [2022-11-23 14:47:56,156 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1372346488] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:47:56,156 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:47:56,156 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-23 14:47:56,156 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451192148] [2022-11-23 14:47:56,157 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:47:56,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 14:47:56,157 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:56,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 14:47:56,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-11-23 14:47:56,158 INFO L87 Difference]: Start difference. First operand 155 states and 220 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:47:56,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:56,356 INFO L93 Difference]: Finished difference Result 176 states and 234 transitions. [2022-11-23 14:47:56,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 14:47:56,356 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2022-11-23 14:47:56,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:56,357 INFO L225 Difference]: With dead ends: 176 [2022-11-23 14:47:56,358 INFO L226 Difference]: Without dead ends: 176 [2022-11-23 14:47:56,358 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2022-11-23 14:47:56,358 INFO L413 NwaCegarLoop]: 77 mSDtfsCounter, 133 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:56,359 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 323 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:47:56,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 176 states. [2022-11-23 14:47:56,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 176 to 152. [2022-11-23 14:47:56,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 107 states have (on average 1.6728971962616823) internal successors, (179), 132 states have internal predecessors, (179), 15 states have call successors, (15), 5 states have call predecessors, (15), 6 states have return successors, (20), 14 states have call predecessors, (20), 15 states have call successors, (20) [2022-11-23 14:47:56,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 214 transitions. [2022-11-23 14:47:56,365 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 214 transitions. Word has length 17 [2022-11-23 14:47:56,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:56,365 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 214 transitions. [2022-11-23 14:47:56,366 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:47:56,366 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 214 transitions. [2022-11-23 14:47:56,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-23 14:47:56,366 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:56,367 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:56,367 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2022-11-23 14:47:56,367 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:47:56,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:56,368 INFO L85 PathProgramCache]: Analyzing trace with hash -158970448, now seen corresponding path program 1 times [2022-11-23 14:47:56,368 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:56,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1612690144] [2022-11-23 14:47:56,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:56,368 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:56,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:56,690 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:56,690 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:56,690 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1612690144] [2022-11-23 14:47:56,691 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1612690144] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:47:56,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975670224] [2022-11-23 14:47:56,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:56,691 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:56,691 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:47:56,696 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:47:56,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-23 14:47:56,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:56,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 28 conjunts are in the unsatisfiable core [2022-11-23 14:47:56,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:47:56,840 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 [2022-11-23 14:47:56,892 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:47:56,968 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 21 treesize of output 9 [2022-11-23 14:47:56,978 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:56,979 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:47:57,014 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 34 treesize of output 28 [2022-11-23 14:47:57,118 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:57,118 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1975670224] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:47:57,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1761147176] [2022-11-23 14:47:57,121 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 14:47:57,121 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:47:57,122 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 14:47:57,124 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:47:57,125 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 15 [2022-11-23 14:47:57,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2087521242] [2022-11-23 14:47:57,125 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:47:57,125 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-23 14:47:57,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:47:57,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-23 14:47:57,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2022-11-23 14:47:57,127 INFO L87 Difference]: Start difference. First operand 152 states and 214 transitions. Second operand has 16 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 13 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:47:57,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:47:57,864 INFO L93 Difference]: Finished difference Result 258 states and 350 transitions. [2022-11-23 14:47:57,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-11-23 14:47:57,865 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 13 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-23 14:47:57,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:47:57,867 INFO L225 Difference]: With dead ends: 258 [2022-11-23 14:47:57,867 INFO L226 Difference]: Without dead ends: 258 [2022-11-23 14:47:57,867 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=76, Invalid=344, Unknown=0, NotChecked=0, Total=420 [2022-11-23 14:47:57,868 INFO L413 NwaCegarLoop]: 112 mSDtfsCounter, 336 mSDsluCounter, 557 mSDsCounter, 0 mSdLazyCounter, 898 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 346 SdHoareTripleChecker+Valid, 669 SdHoareTripleChecker+Invalid, 954 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 898 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-23 14:47:57,868 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [346 Valid, 669 Invalid, 954 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 898 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-23 14:47:57,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2022-11-23 14:47:57,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 175. [2022-11-23 14:47:57,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 175 states, 123 states have (on average 1.5934959349593496) internal successors, (196), 149 states have internal predecessors, (196), 20 states have call successors, (20), 7 states have call predecessors, (20), 8 states have return successors, (25), 18 states have call predecessors, (25), 20 states have call successors, (25) [2022-11-23 14:47:57,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 241 transitions. [2022-11-23 14:47:57,877 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 241 transitions. Word has length 19 [2022-11-23 14:47:57,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:47:57,877 INFO L495 AbstractCegarLoop]: Abstraction has 175 states and 241 transitions. [2022-11-23 14:47:57,877 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 13 states have internal predecessors, (32), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:47:57,878 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 241 transitions. [2022-11-23 14:47:57,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-23 14:47:57,878 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:47:57,878 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:47:57,885 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-23 14:47:58,084 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-23 14:47:58,085 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting is_list_containing_xErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:47:58,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:47:58,085 INFO L85 PathProgramCache]: Analyzing trace with hash -158970447, now seen corresponding path program 1 times [2022-11-23 14:47:58,085 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:47:58,086 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2137559231] [2022-11-23 14:47:58,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:58,086 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:47:58,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:58,996 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:58,996 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:47:58,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2137559231] [2022-11-23 14:47:58,997 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2137559231] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:47:58,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1525604642] [2022-11-23 14:47:58,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:47:58,997 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:47:58,997 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:47:58,999 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:47:59,023 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-23 14:47:59,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:47:59,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 54 conjunts are in the unsatisfiable core [2022-11-23 14:47:59,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:47:59,301 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:47:59,308 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:47:59,465 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 17 treesize of output 9 [2022-11-23 14:47:59,470 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 [2022-11-23 14:47:59,563 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:47:59,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:47:59,904 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 34 treesize of output 28 [2022-11-23 14:47:59,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:59,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:59,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:59,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:47:59,977 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 6 [2022-11-23 14:48:00,082 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:48:00,082 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1525604642] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:48:00,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [811891400] [2022-11-23 14:48:00,084 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 14:48:00,084 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:48:00,085 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 14:48:00,086 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:48:00,086 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 11] total 33 [2022-11-23 14:48:00,087 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1944170255] [2022-11-23 14:48:00,087 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:48:00,089 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-23 14:48:00,089 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:00,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-23 14:48:00,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=960, Unknown=0, NotChecked=0, Total=1056 [2022-11-23 14:48:00,090 INFO L87 Difference]: Start difference. First operand 175 states and 241 transitions. Second operand has 33 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 27 states have internal predecessors, (49), 6 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:48:03,441 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:48:03,441 INFO L93 Difference]: Finished difference Result 324 states and 412 transitions. [2022-11-23 14:48:03,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-23 14:48:03,442 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 27 states have internal predecessors, (49), 6 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-11-23 14:48:03,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:48:03,444 INFO L225 Difference]: With dead ends: 324 [2022-11-23 14:48:03,444 INFO L226 Difference]: Without dead ends: 324 [2022-11-23 14:48:03,445 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 584 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=347, Invalid=2515, Unknown=0, NotChecked=0, Total=2862 [2022-11-23 14:48:03,445 INFO L413 NwaCegarLoop]: 90 mSDtfsCounter, 1085 mSDsluCounter, 1207 mSDsCounter, 0 mSdLazyCounter, 2173 mSolverCounterSat, 239 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1098 SdHoareTripleChecker+Valid, 1297 SdHoareTripleChecker+Invalid, 2412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 239 IncrementalHoareTripleChecker+Valid, 2173 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:48:03,446 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1098 Valid, 1297 Invalid, 2412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [239 Valid, 2173 Invalid, 0 Unknown, 0 Unchecked, 2.0s Time] [2022-11-23 14:48:03,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2022-11-23 14:48:03,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 239. [2022-11-23 14:48:03,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 174 states have (on average 1.5632183908045978) internal successors, (272), 202 states have internal predecessors, (272), 29 states have call successors, (29), 10 states have call predecessors, (29), 12 states have return successors, (39), 26 states have call predecessors, (39), 29 states have call successors, (39) [2022-11-23 14:48:03,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 340 transitions. [2022-11-23 14:48:03,464 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 340 transitions. Word has length 19 [2022-11-23 14:48:03,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:48:03,464 INFO L495 AbstractCegarLoop]: Abstraction has 239 states and 340 transitions. [2022-11-23 14:48:03,464 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 30 states have (on average 1.6333333333333333) internal successors, (49), 27 states have internal predecessors, (49), 6 states have call successors, (6), 6 states have call predecessors, (6), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:48:03,464 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 340 transitions. [2022-11-23 14:48:03,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-11-23 14:48:03,465 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:48:03,466 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:48:03,476 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-23 14:48:03,671 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-23 14:48:03,672 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:48:03,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:48:03,672 INFO L85 PathProgramCache]: Analyzing trace with hash 1801700008, now seen corresponding path program 1 times [2022-11-23 14:48:03,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:48:03,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1286782818] [2022-11-23 14:48:03,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:03,672 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:48:03,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:03,874 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:48:03,874 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:03,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1286782818] [2022-11-23 14:48:03,874 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1286782818] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:48:03,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1392552746] [2022-11-23 14:48:03,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:03,875 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:03,875 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:03,876 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:48:03,903 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-23 14:48:04,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:04,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 34 conjunts are in the unsatisfiable core [2022-11-23 14:48:04,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:48:04,052 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 [2022-11-23 14:48:04,354 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:48:04,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:48:04,715 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2022-11-23 14:48:04,717 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:48:04,717 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1392552746] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:48:04,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [561557210] [2022-11-23 14:48:04,723 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2022-11-23 14:48:04,723 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:48:04,723 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:48:04,724 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:48:04,724 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:48:04,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,763 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 [2022-11-23 14:48:04,781 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,782 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 30 treesize of output 21 [2022-11-23 14:48:04,791 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 [2022-11-23 14:48:04,799 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 [2022-11-23 14:48:04,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,820 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 [2022-11-23 14:48:04,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,833 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 21 treesize of output 20 [2022-11-23 14:48:04,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,846 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 21 treesize of output 20 [2022-11-23 14:48:04,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,879 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,881 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 29 treesize of output 35 [2022-11-23 14:48:04,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,916 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:48:04,930 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,931 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 30 treesize of output 21 [2022-11-23 14:48:04,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,948 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:48:04,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,984 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:48:04,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:04,999 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 [2022-11-23 14:48:05,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,018 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:48:05,058 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,062 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:05,063 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:48:05,089 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,097 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,098 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:05,100 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:48:05,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,119 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 [2022-11-23 14:48:05,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,181 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 60 [2022-11-23 14:48:05,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,237 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 30 treesize of output 21 [2022-11-23 14:48:05,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,254 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:05,272 INFO L321 Elim1Store]: treesize reduction 39, result has 25.0 percent of original size [2022-11-23 14:48:05,272 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 241 treesize of output 180 [2022-11-23 14:48:05,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,300 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-23 14:48:05,301 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 1 case distinctions, treesize of input 154 treesize of output 132 [2022-11-23 14:48:05,333 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:48:05,338 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:48:05,343 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:48:05,358 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:05,367 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:48:05,367 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 23 treesize of output 22 [2022-11-23 14:48:05,373 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:48:05,380 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:05,391 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:48:05,391 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 23 treesize of output 26 [2022-11-23 14:48:05,443 INFO L321 Elim1Store]: treesize reduction 32, result has 58.4 percent of original size [2022-11-23 14:48:05,444 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 3 case distinctions, treesize of input 33 treesize of output 66 [2022-11-23 14:48:05,526 INFO L321 Elim1Store]: treesize reduction 68, result has 31.3 percent of original size [2022-11-23 14:48:05,527 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 5 case distinctions, treesize of input 28 treesize of output 45 [2022-11-23 14:48:05,557 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 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 [2022-11-23 14:48:05,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:05,571 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:05,576 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-23 14:48:05,577 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 169 treesize of output 120 [2022-11-23 14:48:05,594 INFO L321 Elim1Store]: treesize reduction 19, result has 5.0 percent of original size [2022-11-23 14:48:05,595 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 157 treesize of output 138 [2022-11-23 14:48:05,619 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:48:05,626 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:48:05,633 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:48:05,651 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:05,662 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:48:05,662 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 23 treesize of output 22 [2022-11-23 14:48:05,670 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:48:05,679 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:05,691 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:48:05,692 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 23 treesize of output 26 [2022-11-23 14:48:05,805 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 [2022-11-23 14:48:05,811 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 [2022-11-23 14:48:05,816 INFO L197 IcfgInterpreter]: Interpreting procedure is_list_containing_x with input of size 12 for LOIs [2022-11-23 14:48:05,830 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:48:06,715 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [561557210] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:48:06,715 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:48:06,715 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [8, 9, 8] total 31 [2022-11-23 14:48:06,716 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1593660413] [2022-11-23 14:48:06,716 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:48:06,716 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-23 14:48:06,717 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:06,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-23 14:48:06,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=790, Unknown=0, NotChecked=0, Total=930 [2022-11-23 14:48:06,718 INFO L87 Difference]: Start difference. First operand 239 states and 340 transitions. Second operand has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 11 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:48:07,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:48:07,963 INFO L93 Difference]: Finished difference Result 281 states and 380 transitions. [2022-11-23 14:48:07,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-23 14:48:07,964 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 11 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 18 [2022-11-23 14:48:07,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:48:07,966 INFO L225 Difference]: With dead ends: 281 [2022-11-23 14:48:07,966 INFO L226 Difference]: Without dead ends: 279 [2022-11-23 14:48:07,967 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 369 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=170, Invalid=1020, Unknown=0, NotChecked=0, Total=1190 [2022-11-23 14:48:07,967 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 208 mSDsluCounter, 218 mSDsCounter, 0 mSdLazyCounter, 738 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 215 SdHoareTripleChecker+Valid, 272 SdHoareTripleChecker+Invalid, 770 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 738 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-23 14:48:07,968 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [215 Valid, 272 Invalid, 770 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 738 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-23 14:48:07,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 279 states. [2022-11-23 14:48:07,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 279 to 243. [2022-11-23 14:48:07,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 176 states have (on average 1.5568181818181819) internal successors, (274), 206 states have internal predecessors, (274), 29 states have call successors, (29), 10 states have call predecessors, (29), 14 states have return successors, (43), 26 states have call predecessors, (43), 29 states have call successors, (43) [2022-11-23 14:48:07,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 346 transitions. [2022-11-23 14:48:07,980 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 346 transitions. Word has length 18 [2022-11-23 14:48:07,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:48:07,980 INFO L495 AbstractCegarLoop]: Abstraction has 243 states and 346 transitions. [2022-11-23 14:48:07,980 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 11 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:48:07,980 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 346 transitions. [2022-11-23 14:48:07,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-23 14:48:07,981 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:48:07,981 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:48:07,992 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-23 14:48:08,191 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:08,192 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:48:08,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:48:08,193 INFO L85 PathProgramCache]: Analyzing trace with hash -130356238, now seen corresponding path program 1 times [2022-11-23 14:48:08,193 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:48:08,193 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1276233755] [2022-11-23 14:48:08,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:08,193 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:48:08,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:08,276 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:48:08,276 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:08,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1276233755] [2022-11-23 14:48:08,276 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1276233755] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:48:08,276 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:48:08,277 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:48:08,277 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [26338601] [2022-11-23 14:48:08,277 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:48:08,277 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:48:08,278 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:08,278 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:48:08,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:48:08,278 INFO L87 Difference]: Start difference. First operand 243 states and 346 transitions. Second operand has 5 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:48:08,347 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:48:08,348 INFO L93 Difference]: Finished difference Result 259 states and 367 transitions. [2022-11-23 14:48:08,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:48:08,352 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 20 [2022-11-23 14:48:08,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:48:08,354 INFO L225 Difference]: With dead ends: 259 [2022-11-23 14:48:08,354 INFO L226 Difference]: Without dead ends: 259 [2022-11-23 14:48:08,355 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:48:08,355 INFO L413 NwaCegarLoop]: 77 mSDtfsCounter, 6 mSDsluCounter, 221 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 298 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:48:08,356 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 298 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:48:08,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2022-11-23 14:48:08,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 253. [2022-11-23 14:48:08,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 179 states have (on average 1.547486033519553) internal successors, (277), 215 states have internal predecessors, (277), 35 states have call successors, (35), 11 states have call predecessors, (35), 15 states have return successors, (49), 26 states have call predecessors, (49), 35 states have call successors, (49) [2022-11-23 14:48:08,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 361 transitions. [2022-11-23 14:48:08,370 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 361 transitions. Word has length 20 [2022-11-23 14:48:08,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:48:08,370 INFO L495 AbstractCegarLoop]: Abstraction has 253 states and 361 transitions. [2022-11-23 14:48:08,371 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:48:08,371 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 361 transitions. [2022-11-23 14:48:08,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-23 14:48:08,372 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:48:08,372 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:48:08,372 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2022-11-23 14:48:08,372 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:48:08,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:48:08,373 INFO L85 PathProgramCache]: Analyzing trace with hash -2029912448, now seen corresponding path program 1 times [2022-11-23 14:48:08,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:48:08,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614350431] [2022-11-23 14:48:08,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:08,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:48:08,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:08,743 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:48:08,743 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:08,743 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614350431] [2022-11-23 14:48:08,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [614350431] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:48:08,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [303176882] [2022-11-23 14:48:08,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:08,744 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:08,744 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:08,746 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:48:08,753 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-23 14:48:08,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:08,926 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 39 conjunts are in the unsatisfiable core [2022-11-23 14:48:08,929 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:48:08,986 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 [2022-11-23 14:48:09,045 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:48:09,437 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:48:09,438 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 17 [2022-11-23 14:48:09,508 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:48:09,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:48:09,800 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [303176882] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:48:09,800 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [273146737] [2022-11-23 14:48:09,802 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-23 14:48:09,802 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:48:09,803 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:48:09,803 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:48:09,803 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:48:09,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:09,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:09,825 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 [2022-11-23 14:48:09,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:09,846 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 30 treesize of output 21 [2022-11-23 14:48:09,855 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 11 treesize of output 7 [2022-11-23 14:48:09,869 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 [2022-11-23 14:48:09,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:09,892 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 21 treesize of output 20 [2022-11-23 14:48:09,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:09,905 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 [2022-11-23 14:48:09,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:09,919 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 21 treesize of output 20 [2022-11-23 14:48:09,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:09,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:09,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:09,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:09,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:09,955 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 29 treesize of output 35 [2022-11-23 14:48:09,994 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:09,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:09,997 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:48:10,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,017 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:48:10,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,035 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 30 treesize of output 21 [2022-11-23 14:48:10,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,065 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 [2022-11-23 14:48:10,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,085 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:48:10,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,107 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:48:10,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,145 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 [2022-11-23 14:48:10,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,174 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:10,175 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:48:10,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,199 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:10,200 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:48:10,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,258 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,266 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 54 [2022-11-23 14:48:10,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,333 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:10,351 INFO L321 Elim1Store]: treesize reduction 33, result has 17.5 percent of original size [2022-11-23 14:48:10,352 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 188 treesize of output 133 [2022-11-23 14:48:10,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,382 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 62 [2022-11-23 14:48:10,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,414 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 30 treesize of output 21 [2022-11-23 14:48:10,471 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:48:10,479 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:48:10,487 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:48:10,536 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:10,550 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:48:10,551 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 23 treesize of output 26 [2022-11-23 14:48:10,562 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:10,578 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:48:10,578 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2022-11-23 14:48:10,589 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:48:10,666 INFO L321 Elim1Store]: treesize reduction 68, result has 31.3 percent of original size [2022-11-23 14:48:10,666 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 5 case distinctions, treesize of input 28 treesize of output 45 [2022-11-23 14:48:10,697 INFO L321 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2022-11-23 14:48:10,697 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 33 treesize of output 38 [2022-11-23 14:48:10,740 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 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 [2022-11-23 14:48:10,756 INFO L321 Elim1Store]: treesize reduction 19, result has 5.0 percent of original size [2022-11-23 14:48:10,757 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 190 treesize of output 147 [2022-11-23 14:48:10,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:10,772 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:10,778 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-23 14:48:10,778 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 193 treesize of output 156 [2022-11-23 14:48:10,812 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:48:10,818 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:48:10,824 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:48:10,846 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:48:10,853 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:10,865 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:48:10,866 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 23 treesize of output 26 [2022-11-23 14:48:10,901 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:10,911 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:48:10,911 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 23 treesize of output 22 [2022-11-23 14:48:11,078 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 [2022-11-23 14:48:11,083 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 [2022-11-23 14:48:11,090 INFO L197 IcfgInterpreter]: Interpreting procedure is_list_containing_x with input of size 15 for LOIs [2022-11-23 14:48:11,095 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:48:13,721 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7632#(and (= (mod (+ (* 255 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) 1) 256) 0) (<= 0 |ULTIMATE.start_main_~tail~0#1.base|) (= (select |#valid| |ULTIMATE.start_remove_~x#1.base|) 1) (= |ULTIMATE.start_remove_#in~x#1.offset| |ULTIMATE.start_main_~x~0#1.offset|) (= |ULTIMATE.start_main_~#list~0#1.base| |ULTIMATE.start_main_~x~0#1.base|) (= |ULTIMATE.start_remove_#t~mem4#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4))) (<= (+ 8 |ULTIMATE.start_remove_~x#1.offset|) (select |#length| |ULTIMATE.start_remove_~x#1.base|)) (<= 0 |ULTIMATE.start_main_~tail~0#1.offset|) (= |ULTIMATE.start_remove_#in~x#1.base| |ULTIMATE.start_main_~x~0#1.base|) (< |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 256) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4)) |ULTIMATE.start_remove_#t~mem4#1.offset|) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#list~0#1.base|) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) |ULTIMATE.start_remove_~x#1.offset|) |ULTIMATE.start_remove_#t~mem5#1.base|) (= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_remove_~x#1.offset|) (<= |ULTIMATE.start_main_~#list~0#1.offset| 0) (= |ULTIMATE.start_remove_#t~mem5#1.offset| (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) |ULTIMATE.start_remove_~x#1.offset|)) (= |ULTIMATE.start_main_~#list~0#1.offset| |ULTIMATE.start_main_~x~0#1.offset|) (= |ULTIMATE.start_remove_#in~x#1.offset| |ULTIMATE.start_remove_~x#1.offset|) (or (not (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4)) 0)) (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4)) 0))) (= |ULTIMATE.start_remove_#in~x#1.base| |ULTIMATE.start_remove_~x#1.base|) (not (= (select |#valid| |ULTIMATE.start_remove_#t~mem4#1.base|) 1)) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (<= |ULTIMATE.start_main_~tail~0#1.offset| 0))' at error location [2022-11-23 14:48:13,721 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:48:13,721 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:48:13,721 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 19 [2022-11-23 14:48:13,721 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102797054] [2022-11-23 14:48:13,721 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:48:13,722 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-11-23 14:48:13,722 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:13,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-11-23 14:48:13,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1420, Unknown=0, NotChecked=0, Total=1560 [2022-11-23 14:48:13,723 INFO L87 Difference]: Start difference. First operand 253 states and 361 transitions. Second operand has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 17 states have internal predecessors, (35), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:48:15,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:48:15,563 INFO L93 Difference]: Finished difference Result 380 states and 490 transitions. [2022-11-23 14:48:15,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-23 14:48:15,564 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 17 states have internal predecessors, (35), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 20 [2022-11-23 14:48:15,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:48:15,566 INFO L225 Difference]: With dead ends: 380 [2022-11-23 14:48:15,566 INFO L226 Difference]: Without dead ends: 380 [2022-11-23 14:48:15,567 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 482 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=227, Invalid=1935, Unknown=0, NotChecked=0, Total=2162 [2022-11-23 14:48:15,568 INFO L413 NwaCegarLoop]: 82 mSDtfsCounter, 711 mSDsluCounter, 827 mSDsCounter, 0 mSdLazyCounter, 1253 mSolverCounterSat, 154 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 724 SdHoareTripleChecker+Valid, 909 SdHoareTripleChecker+Invalid, 1407 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 1253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-23 14:48:15,568 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [724 Valid, 909 Invalid, 1407 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [154 Valid, 1253 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-23 14:48:15,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 380 states. [2022-11-23 14:48:15,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 380 to 272. [2022-11-23 14:48:15,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 193 states have (on average 1.538860103626943) internal successors, (297), 229 states have internal predecessors, (297), 37 states have call successors, (37), 14 states have call predecessors, (37), 18 states have return successors, (51), 28 states have call predecessors, (51), 37 states have call successors, (51) [2022-11-23 14:48:15,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 385 transitions. [2022-11-23 14:48:15,580 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 385 transitions. Word has length 20 [2022-11-23 14:48:15,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:48:15,580 INFO L495 AbstractCegarLoop]: Abstraction has 272 states and 385 transitions. [2022-11-23 14:48:15,580 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 17 states have internal predecessors, (35), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:48:15,581 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 385 transitions. [2022-11-23 14:48:15,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-11-23 14:48:15,581 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:48:15,581 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:48:15,592 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-23 14:48:15,787 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-11-23 14:48:15,787 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr17REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:48:15,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:48:15,787 INFO L85 PathProgramCache]: Analyzing trace with hash -2029912447, now seen corresponding path program 1 times [2022-11-23 14:48:15,788 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:48:15,788 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107078589] [2022-11-23 14:48:15,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:15,788 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:48:15,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:16,694 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:48:16,695 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:16,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107078589] [2022-11-23 14:48:16,695 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [107078589] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:48:16,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1229867696] [2022-11-23 14:48:16,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:16,695 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:16,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:16,697 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:48:16,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-23 14:48:16,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:16,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 205 conjuncts, 52 conjunts are in the unsatisfiable core [2022-11-23 14:48:16,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:48:16,980 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:48:16,986 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:48:17,271 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 21 treesize of output 9 [2022-11-23 14:48:17,276 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 19 treesize of output 7 [2022-11-23 14:48:17,308 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:48:17,309 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:48:17,736 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 70 treesize of output 64 [2022-11-23 14:48:17,739 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 94 treesize of output 82 [2022-11-23 14:48:17,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:17,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:17,874 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 6 [2022-11-23 14:48:17,932 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:48:17,932 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1229867696] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:48:17,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1244419169] [2022-11-23 14:48:17,935 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2022-11-23 14:48:17,936 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:48:17,936 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:48:17,936 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:48:17,936 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:48:17,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:17,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:17,959 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 [2022-11-23 14:48:17,973 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 [2022-11-23 14:48:17,982 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:17,984 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 30 treesize of output 21 [2022-11-23 14:48:17,994 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 [2022-11-23 14:48:18,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,013 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 21 treesize of output 20 [2022-11-23 14:48:18,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,023 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 21 treesize of output 20 [2022-11-23 14:48:18,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,035 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 [2022-11-23 14:48:18,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,067 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 29 treesize of output 35 [2022-11-23 14:48:18,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,099 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 30 treesize of output 21 [2022-11-23 14:48:18,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,116 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,117 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:48:18,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,136 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:48:18,159 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,163 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:48:18,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,179 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:48:18,190 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,191 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 [2022-11-23 14:48:18,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,220 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:18,221 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:48:18,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,245 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:18,245 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:48:18,260 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,261 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 [2022-11-23 14:48:18,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,308 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,310 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,314 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,315 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,322 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 60 [2022-11-23 14:48:18,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,380 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 30 treesize of output 21 [2022-11-23 14:48:18,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,404 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-23 14:48:18,404 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 1 case distinctions, treesize of input 154 treesize of output 132 [2022-11-23 14:48:18,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,420 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:18,421 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:18,435 INFO L321 Elim1Store]: treesize reduction 33, result has 17.5 percent of original size [2022-11-23 14:48:18,436 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 188 treesize of output 133 [2022-11-23 14:48:18,473 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:48:18,481 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:48:18,488 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:48:18,542 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:18,555 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:48:18,555 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 23 treesize of output 26 [2022-11-23 14:48:18,566 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:18,577 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:48:18,577 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 23 treesize of output 22 [2022-11-23 14:48:18,585 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:48:18,659 INFO L321 Elim1Store]: treesize reduction 32, result has 58.4 percent of original size [2022-11-23 14:48:18,661 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 3 case distinctions, treesize of input 25 treesize of output 58 [2022-11-23 14:48:18,723 INFO L321 Elim1Store]: treesize reduction 68, result has 31.3 percent of original size [2022-11-23 14:48:18,723 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 5 case distinctions, treesize of input 28 treesize of output 45 [2022-11-23 14:48:18,763 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:18,767 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-23 14:48:18,767 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 132 treesize of output 89 [2022-11-23 14:48:18,783 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:18,788 INFO L321 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2022-11-23 14:48:18,788 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 1 case distinctions, treesize of input 34 treesize of output 36 [2022-11-23 14:48:18,800 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-23 14:48:18,812 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:48:18,816 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:48:18,821 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:48:18,850 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:18,866 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:48:18,866 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 23 treesize of output 26 [2022-11-23 14:48:18,878 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:18,888 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:48:18,889 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2022-11-23 14:48:18,898 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:48:19,095 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 [2022-11-23 14:48:19,104 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 [2022-11-23 14:48:19,110 INFO L197 IcfgInterpreter]: Interpreting procedure is_list_containing_x with input of size 15 for LOIs [2022-11-23 14:48:19,117 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:48:21,777 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8461#(and (= (mod (+ (* 255 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) 1) 256) 0) (<= 0 |ULTIMATE.start_main_~tail~0#1.base|) (= (select |#valid| |ULTIMATE.start_remove_~x#1.base|) 1) (= |ULTIMATE.start_remove_#in~x#1.offset| |ULTIMATE.start_main_~x~0#1.offset|) (= |ULTIMATE.start_main_~#list~0#1.base| |ULTIMATE.start_main_~x~0#1.base|) (= |ULTIMATE.start_remove_#t~mem4#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4))) (<= (+ 8 |ULTIMATE.start_remove_~x#1.offset|) (select |#length| |ULTIMATE.start_remove_~x#1.base|)) (<= 0 |ULTIMATE.start_main_~tail~0#1.offset|) (= |ULTIMATE.start_remove_#in~x#1.base| |ULTIMATE.start_main_~x~0#1.base|) (< |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 256) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4)) |ULTIMATE.start_remove_#t~mem4#1.offset|) (or (not (<= 0 |ULTIMATE.start_remove_#t~mem4#1.offset|)) (not (<= (+ |ULTIMATE.start_remove_#t~mem4#1.offset| 4) (select |#length| |ULTIMATE.start_remove_#t~mem4#1.base|)))) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#list~0#1.base|) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) |ULTIMATE.start_remove_~x#1.offset|) |ULTIMATE.start_remove_#t~mem5#1.base|) (= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_remove_~x#1.offset|) (<= |ULTIMATE.start_main_~#list~0#1.offset| 0) (= |ULTIMATE.start_remove_#t~mem5#1.offset| (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) |ULTIMATE.start_remove_~x#1.offset|)) (= |ULTIMATE.start_main_~#list~0#1.offset| |ULTIMATE.start_main_~x~0#1.offset|) (= |ULTIMATE.start_remove_#in~x#1.offset| |ULTIMATE.start_remove_~x#1.offset|) (or (not (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4)) 0)) (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4)) 0))) (= |ULTIMATE.start_remove_#in~x#1.base| |ULTIMATE.start_remove_~x#1.base|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (<= |ULTIMATE.start_main_~tail~0#1.offset| 0))' at error location [2022-11-23 14:48:21,778 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:48:21,778 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:48:21,778 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 10] total 32 [2022-11-23 14:48:21,778 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66162697] [2022-11-23 14:48:21,778 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:48:21,779 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-11-23 14:48:21,779 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:21,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-11-23 14:48:21,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=2183, Unknown=0, NotChecked=0, Total=2352 [2022-11-23 14:48:21,780 INFO L87 Difference]: Start difference. First operand 272 states and 385 transitions. Second operand has 33 states, 32 states have (on average 1.59375) internal successors, (51), 29 states have internal predecessors, (51), 3 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 14:48:27,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:48:27,917 INFO L93 Difference]: Finished difference Result 509 states and 641 transitions. [2022-11-23 14:48:27,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-23 14:48:27,918 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 1.59375) internal successors, (51), 29 states have internal predecessors, (51), 3 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 20 [2022-11-23 14:48:27,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:48:27,922 INFO L225 Difference]: With dead ends: 509 [2022-11-23 14:48:27,922 INFO L226 Difference]: Without dead ends: 509 [2022-11-23 14:48:27,924 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1455 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=611, Invalid=4791, Unknown=0, NotChecked=0, Total=5402 [2022-11-23 14:48:27,924 INFO L413 NwaCegarLoop]: 73 mSDtfsCounter, 1181 mSDsluCounter, 860 mSDsCounter, 0 mSdLazyCounter, 2738 mSolverCounterSat, 361 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1185 SdHoareTripleChecker+Valid, 933 SdHoareTripleChecker+Invalid, 3099 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 361 IncrementalHoareTripleChecker+Valid, 2738 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:48:27,924 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1185 Valid, 933 Invalid, 3099 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [361 Valid, 2738 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2022-11-23 14:48:27,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 509 states. [2022-11-23 14:48:27,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 509 to 334. [2022-11-23 14:48:27,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 239 states have (on average 1.5271966527196652) internal successors, (365), 278 states have internal predecessors, (365), 47 states have call successors, (47), 19 states have call predecessors, (47), 24 states have return successors, (64), 36 states have call predecessors, (64), 47 states have call successors, (64) [2022-11-23 14:48:27,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 476 transitions. [2022-11-23 14:48:27,943 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 476 transitions. Word has length 20 [2022-11-23 14:48:27,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:48:27,943 INFO L495 AbstractCegarLoop]: Abstraction has 334 states and 476 transitions. [2022-11-23 14:48:27,943 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 1.59375) internal successors, (51), 29 states have internal predecessors, (51), 3 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-23 14:48:27,944 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 476 transitions. [2022-11-23 14:48:27,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-23 14:48:27,944 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:48:27,945 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:48:27,951 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-11-23 14:48:28,151 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-11-23 14:48:28,151 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr24REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:48:28,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:48:28,152 INFO L85 PathProgramCache]: Analyzing trace with hash -474693630, now seen corresponding path program 1 times [2022-11-23 14:48:28,152 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:48:28,152 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [622211368] [2022-11-23 14:48:28,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:28,153 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:48:28,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:28,775 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:48:28,775 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:48:28,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [622211368] [2022-11-23 14:48:28,776 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [622211368] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:48:28,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [13407969] [2022-11-23 14:48:28,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:48:28,776 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:48:28,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:48:28,780 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:48:28,791 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-23 14:48:28,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:48:28,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 36 conjunts are in the unsatisfiable core [2022-11-23 14:48:28,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:48:29,041 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 [2022-11-23 14:48:29,382 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:48:29,382 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 16 [2022-11-23 14:48:29,452 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:48:29,452 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:48:29,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [13407969] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:48:29,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1344890046] [2022-11-23 14:48:29,723 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2022-11-23 14:48:29,723 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:48:29,724 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:48:29,724 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:48:29,724 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:48:29,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,750 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 [2022-11-23 14:48:29,773 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 [2022-11-23 14:48:29,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,782 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 30 treesize of output 21 [2022-11-23 14:48:29,792 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 [2022-11-23 14:48:29,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,816 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 21 treesize of output 20 [2022-11-23 14:48:29,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,834 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 [2022-11-23 14:48:29,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,847 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 21 treesize of output 20 [2022-11-23 14:48:29,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,874 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,878 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 29 treesize of output 35 [2022-11-23 14:48:29,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,910 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 30 treesize of output 21 [2022-11-23 14:48:29,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,922 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,923 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:48:29,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,938 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:48:29,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,966 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:48:29,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,982 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 [2022-11-23 14:48:29,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:29,999 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:48:30,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,056 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:30,057 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:48:30,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,075 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 [2022-11-23 14:48:30,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,103 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:30,104 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:48:30,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,135 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,138 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,147 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 60 [2022-11-23 14:48:30,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,206 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 30 treesize of output 21 [2022-11-23 14:48:30,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,234 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-23 14:48:30,234 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 7 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 1 case distinctions, treesize of input 135 treesize of output 119 [2022-11-23 14:48:30,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:48:30,254 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:30,270 INFO L321 Elim1Store]: treesize reduction 33, result has 17.5 percent of original size [2022-11-23 14:48:30,270 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 188 treesize of output 133 [2022-11-23 14:48:30,332 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:48:30,338 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:48:30,344 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:48:30,359 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:30,371 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:48:30,371 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 23 treesize of output 26 [2022-11-23 14:48:30,404 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:48:30,414 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:30,425 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:48:30,426 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 23 treesize of output 22 [2022-11-23 14:48:30,493 INFO L321 Elim1Store]: treesize reduction 68, result has 31.3 percent of original size [2022-11-23 14:48:30,494 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 5 case distinctions, treesize of input 28 treesize of output 45 [2022-11-23 14:48:30,509 INFO L321 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2022-11-23 14:48:30,509 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 1 case distinctions, treesize of input 33 treesize of output 38 [2022-11-23 14:48:30,550 INFO L321 Elim1Store]: treesize reduction 19, result has 5.0 percent of original size [2022-11-23 14:48:30,550 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 119 treesize of output 100 [2022-11-23 14:48:30,561 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:30,566 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-23 14:48:30,567 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 101 treesize of output 70 [2022-11-23 14:48:30,584 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-23 14:48:30,600 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:48:30,605 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:48:30,612 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:48:30,632 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:30,642 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:48:30,643 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 23 treesize of output 22 [2022-11-23 14:48:30,674 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:48:30,685 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:48:30,699 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:48:30,700 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 23 treesize of output 26 [2022-11-23 14:48:30,926 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 [2022-11-23 14:48:30,931 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 [2022-11-23 14:48:30,936 INFO L197 IcfgInterpreter]: Interpreting procedure is_list_containing_x with input of size 15 for LOIs [2022-11-23 14:48:30,941 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:48:38,369 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9486#(and (not (= (select |#valid| |ULTIMATE.start_remove_#t~mem7#1.base|) 1)) (= (mod (+ (* 255 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) 1) 256) 0) (<= 0 |ULTIMATE.start_main_~tail~0#1.base|) (= (select |#valid| |ULTIMATE.start_remove_~x#1.base|) 1) (= |ULTIMATE.start_remove_#in~x#1.offset| |ULTIMATE.start_main_~x~0#1.offset|) (= |ULTIMATE.start_main_~#list~0#1.base| |ULTIMATE.start_main_~x~0#1.base|) (<= (+ 8 |ULTIMATE.start_remove_~x#1.offset|) (select |#length| |ULTIMATE.start_remove_~x#1.base|)) (<= 0 |ULTIMATE.start_main_~tail~0#1.offset|) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4)) 0) (= |ULTIMATE.start_remove_#in~x#1.base| |ULTIMATE.start_main_~x~0#1.base|) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4)) |ULTIMATE.start_remove_#t~mem8#1.offset|) (< |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 256) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#list~0#1.base|) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_remove_~x#1.offset|) (<= |ULTIMATE.start_main_~#list~0#1.offset| 0) (or (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) |ULTIMATE.start_remove_~x#1.offset|) 0)) (not (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) |ULTIMATE.start_remove_~x#1.offset|) 0))) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4)) 0) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) |ULTIMATE.start_remove_~x#1.offset|) |ULTIMATE.start_remove_#t~mem7#1.base|) (= |ULTIMATE.start_main_~#list~0#1.offset| |ULTIMATE.start_main_~x~0#1.offset|) (= |ULTIMATE.start_remove_#in~x#1.offset| |ULTIMATE.start_remove_~x#1.offset|) (= |ULTIMATE.start_remove_#in~x#1.base| |ULTIMATE.start_remove_~x#1.base|) (= |ULTIMATE.start_remove_#t~mem7#1.offset| (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) |ULTIMATE.start_remove_~x#1.offset|)) (= |ULTIMATE.start_remove_#t~mem8#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4))) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (<= |ULTIMATE.start_main_~tail~0#1.offset| 0))' at error location [2022-11-23 14:48:38,369 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:48:38,369 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:48:38,369 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12] total 22 [2022-11-23 14:48:38,369 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1393144339] [2022-11-23 14:48:38,370 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:48:38,370 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-11-23 14:48:38,370 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:48:38,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-11-23 14:48:38,371 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=1729, Unknown=2, NotChecked=0, Total=1892 [2022-11-23 14:48:38,371 INFO L87 Difference]: Start difference. First operand 334 states and 476 transitions. Second operand has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 19 states have internal predecessors, (37), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:48:40,389 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:48:42,415 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:48:44,466 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:48:46,534 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:48:48,668 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:48:50,759 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:48:53,960 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:48:56,154 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:48:58,217 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:49:00,366 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:49:02,607 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:49:04,718 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:49:07,222 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:49:09,310 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:49:11,373 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:49:13,426 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:49:13,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:13,497 INFO L93 Difference]: Finished difference Result 412 states and 527 transitions. [2022-11-23 14:49:13,498 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-23 14:49:13,499 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 19 states have internal predecessors, (37), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2022-11-23 14:49:13,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:13,501 INFO L225 Difference]: With dead ends: 412 [2022-11-23 14:49:13,502 INFO L226 Difference]: Without dead ends: 410 [2022-11-23 14:49:13,503 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 840 ImplicationChecksByTransitivity, 9.1s TimeCoverageRelationStatistics Valid=378, Invalid=3160, Unknown=2, NotChecked=0, Total=3540 [2022-11-23 14:49:13,503 INFO L413 NwaCegarLoop]: 121 mSDtfsCounter, 519 mSDsluCounter, 1346 mSDsCounter, 0 mSdLazyCounter, 1727 mSolverCounterSat, 112 mSolverCounterUnsat, 16 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 33.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 528 SdHoareTripleChecker+Valid, 1467 SdHoareTripleChecker+Invalid, 1855 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 112 IncrementalHoareTripleChecker+Valid, 1727 IncrementalHoareTripleChecker+Invalid, 16 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 34.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:13,504 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [528 Valid, 1467 Invalid, 1855 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [112 Valid, 1727 Invalid, 16 Unknown, 0 Unchecked, 34.0s Time] [2022-11-23 14:49:13,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2022-11-23 14:49:13,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 319. [2022-11-23 14:49:13,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 228 states have (on average 1.5263157894736843) internal successors, (348), 264 states have internal predecessors, (348), 43 states have call successors, (43), 19 states have call predecessors, (43), 24 states have return successors, (58), 35 states have call predecessors, (58), 43 states have call successors, (58) [2022-11-23 14:49:13,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 449 transitions. [2022-11-23 14:49:13,518 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 449 transitions. Word has length 22 [2022-11-23 14:49:13,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:13,518 INFO L495 AbstractCegarLoop]: Abstraction has 319 states and 449 transitions. [2022-11-23 14:49:13,519 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 19 states have internal predecessors, (37), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:49:13,519 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 449 transitions. [2022-11-23 14:49:13,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-23 14:49:13,520 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:13,520 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:13,535 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-23 14:49:13,726 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:13,726 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr26REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:49:13,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:13,726 INFO L85 PathProgramCache]: Analyzing trace with hash -787313730, now seen corresponding path program 1 times [2022-11-23 14:49:13,727 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:13,727 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1022242334] [2022-11-23 14:49:13,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:13,727 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:13,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:13,789 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:49:13,789 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:13,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1022242334] [2022-11-23 14:49:13,789 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1022242334] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:49:13,789 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:49:13,790 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:49:13,790 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400215608] [2022-11-23 14:49:13,790 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:49:13,790 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 14:49:13,790 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:49:13,791 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 14:49:13,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:49:13,791 INFO L87 Difference]: Start difference. First operand 319 states and 449 transitions. Second operand has 6 states, 5 states have (on average 3.8) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:49:14,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:14,030 INFO L93 Difference]: Finished difference Result 326 states and 439 transitions. [2022-11-23 14:49:14,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:49:14,031 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.8) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2022-11-23 14:49:14,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:14,033 INFO L225 Difference]: With dead ends: 326 [2022-11-23 14:49:14,033 INFO L226 Difference]: Without dead ends: 326 [2022-11-23 14:49:14,033 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2022-11-23 14:49:14,034 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 154 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 179 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 179 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:14,034 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 157 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 179 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:49:14,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 326 states. [2022-11-23 14:49:14,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 326 to 316. [2022-11-23 14:49:14,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 228 states have (on average 1.469298245614035) internal successors, (335), 261 states have internal predecessors, (335), 43 states have call successors, (43), 19 states have call predecessors, (43), 24 states have return successors, (58), 35 states have call predecessors, (58), 43 states have call successors, (58) [2022-11-23 14:49:14,048 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 436 transitions. [2022-11-23 14:49:14,048 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 436 transitions. Word has length 23 [2022-11-23 14:49:14,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:14,049 INFO L495 AbstractCegarLoop]: Abstraction has 316 states and 436 transitions. [2022-11-23 14:49:14,049 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.8) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:49:14,049 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 436 transitions. [2022-11-23 14:49:14,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-11-23 14:49:14,050 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:14,050 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:14,051 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2022-11-23 14:49:14,051 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr27REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:49:14,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:14,051 INFO L85 PathProgramCache]: Analyzing trace with hash -787313729, now seen corresponding path program 1 times [2022-11-23 14:49:14,052 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:14,052 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [532205802] [2022-11-23 14:49:14,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:14,052 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:14,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:14,197 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:49:14,197 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:14,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [532205802] [2022-11-23 14:49:14,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [532205802] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:49:14,198 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:49:14,198 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:49:14,198 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49064186] [2022-11-23 14:49:14,198 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:49:14,199 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 14:49:14,199 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:49:14,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 14:49:14,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:49:14,200 INFO L87 Difference]: Start difference. First operand 316 states and 436 transitions. Second operand has 6 states, 5 states have (on average 3.8) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:49:14,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:14,454 INFO L93 Difference]: Finished difference Result 324 states and 436 transitions. [2022-11-23 14:49:14,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:49:14,455 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 3.8) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 23 [2022-11-23 14:49:14,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:14,456 INFO L225 Difference]: With dead ends: 324 [2022-11-23 14:49:14,456 INFO L226 Difference]: Without dead ends: 324 [2022-11-23 14:49:14,457 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2022-11-23 14:49:14,457 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 52 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:14,457 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [54 Valid, 241 Invalid, 210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:49:14,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2022-11-23 14:49:14,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 316. [2022-11-23 14:49:14,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 228 states have (on average 1.4517543859649122) internal successors, (331), 261 states have internal predecessors, (331), 43 states have call successors, (43), 19 states have call predecessors, (43), 24 states have return successors, (58), 35 states have call predecessors, (58), 43 states have call successors, (58) [2022-11-23 14:49:14,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 432 transitions. [2022-11-23 14:49:14,469 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 432 transitions. Word has length 23 [2022-11-23 14:49:14,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:14,470 INFO L495 AbstractCegarLoop]: Abstraction has 316 states and 432 transitions. [2022-11-23 14:49:14,470 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 3.8) internal successors, (19), 6 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:49:14,470 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 432 transitions. [2022-11-23 14:49:14,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-23 14:49:14,471 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:14,471 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:14,471 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2022-11-23 14:49:14,472 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:49:14,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:14,472 INFO L85 PathProgramCache]: Analyzing trace with hash 840902531, now seen corresponding path program 1 times [2022-11-23 14:49:14,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:14,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1118430081] [2022-11-23 14:49:14,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:14,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:14,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:14,667 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:49:14,667 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:14,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1118430081] [2022-11-23 14:49:14,668 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1118430081] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:49:14,668 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [365932994] [2022-11-23 14:49:14,668 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:14,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:14,668 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:49:14,672 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:49:14,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-23 14:49:14,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:14,841 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 48 conjunts are in the unsatisfiable core [2022-11-23 14:49:14,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:49:14,888 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 [2022-11-23 14:49:15,384 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 44 treesize of output 32 [2022-11-23 14:49:15,416 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:49:15,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:49:15,613 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 24 treesize of output 12 [2022-11-23 14:49:15,850 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 10 treesize of output 4 [2022-11-23 14:49:16,026 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 12 [2022-11-23 14:49:16,030 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:49:16,030 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [365932994] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:49:16,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [253363950] [2022-11-23 14:49:16,032 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2022-11-23 14:49:16,032 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:49:16,033 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 14:49:16,034 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:49:16,034 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13, 12] total 26 [2022-11-23 14:49:16,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1020186968] [2022-11-23 14:49:16,034 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:49:16,034 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-11-23 14:49:16,035 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:49:16,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-11-23 14:49:16,035 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=588, Unknown=0, NotChecked=0, Total=702 [2022-11-23 14:49:16,036 INFO L87 Difference]: Start difference. First operand 316 states and 432 transitions. Second operand has 27 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 25 states have internal predecessors, (55), 5 states have call successors, (5), 2 states have call predecessors, (5), 6 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-23 14:49:18,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:18,213 INFO L93 Difference]: Finished difference Result 496 states and 675 transitions. [2022-11-23 14:49:18,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-11-23 14:49:18,213 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 25 states have internal predecessors, (55), 5 states have call successors, (5), 2 states have call predecessors, (5), 6 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) Word has length 25 [2022-11-23 14:49:18,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:18,216 INFO L225 Difference]: With dead ends: 496 [2022-11-23 14:49:18,217 INFO L226 Difference]: Without dead ends: 496 [2022-11-23 14:49:18,218 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 658 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=464, Invalid=2086, Unknown=0, NotChecked=0, Total=2550 [2022-11-23 14:49:18,218 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 911 mSDsluCounter, 347 mSDsCounter, 0 mSdLazyCounter, 908 mSolverCounterSat, 212 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 911 SdHoareTripleChecker+Valid, 402 SdHoareTripleChecker+Invalid, 1120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 212 IncrementalHoareTripleChecker+Valid, 908 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:18,219 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [911 Valid, 402 Invalid, 1120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [212 Valid, 908 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-11-23 14:49:18,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2022-11-23 14:49:18,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 319. [2022-11-23 14:49:18,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 231 states have (on average 1.4415584415584415) internal successors, (333), 263 states have internal predecessors, (333), 43 states have call successors, (43), 20 states have call predecessors, (43), 25 states have return successors, (58), 35 states have call predecessors, (58), 43 states have call successors, (58) [2022-11-23 14:49:18,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 434 transitions. [2022-11-23 14:49:18,235 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 434 transitions. Word has length 25 [2022-11-23 14:49:18,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:18,235 INFO L495 AbstractCegarLoop]: Abstraction has 319 states and 434 transitions. [2022-11-23 14:49:18,235 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 24 states have (on average 2.2916666666666665) internal successors, (55), 25 states have internal predecessors, (55), 5 states have call successors, (5), 2 states have call predecessors, (5), 6 states have return successors, (6), 4 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-23 14:49:18,236 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 434 transitions. [2022-11-23 14:49:18,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-23 14:49:18,236 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:18,237 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:18,243 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-23 14:49:18,443 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-23 14:49:18,443 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:49:18,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:18,443 INFO L85 PathProgramCache]: Analyzing trace with hash 840902532, now seen corresponding path program 1 times [2022-11-23 14:49:18,443 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:18,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621213793] [2022-11-23 14:49:18,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:18,444 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:18,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:18,739 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:49:18,739 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:18,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621213793] [2022-11-23 14:49:18,739 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1621213793] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:49:18,739 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1660222128] [2022-11-23 14:49:18,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:18,740 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:18,740 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:49:18,741 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:49:18,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-23 14:49:18,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:18,904 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 38 conjunts are in the unsatisfiable core [2022-11-23 14:49:18,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:49:18,947 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 [2022-11-23 14:49:19,296 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:49:19,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:49:19,906 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 26 [2022-11-23 14:49:19,944 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:49:19,944 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1660222128] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:49:19,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1557603341] [2022-11-23 14:49:19,946 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2022-11-23 14:49:19,947 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:49:19,947 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 14:49:19,948 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:49:19,948 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 9] total 24 [2022-11-23 14:49:19,948 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558494946] [2022-11-23 14:49:19,949 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:49:19,949 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-11-23 14:49:19,949 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:49:19,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-11-23 14:49:19,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=499, Unknown=0, NotChecked=0, Total=600 [2022-11-23 14:49:19,950 INFO L87 Difference]: Start difference. First operand 319 states and 434 transitions. Second operand has 25 states, 24 states have (on average 2.3333333333333335) internal successors, (56), 23 states have internal predecessors, (56), 6 states have call successors, (6), 2 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:49:22,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:22,453 INFO L93 Difference]: Finished difference Result 580 states and 809 transitions. [2022-11-23 14:49:22,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-11-23 14:49:22,454 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 24 states have (on average 2.3333333333333335) internal successors, (56), 23 states have internal predecessors, (56), 6 states have call successors, (6), 2 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) Word has length 25 [2022-11-23 14:49:22,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:22,457 INFO L225 Difference]: With dead ends: 580 [2022-11-23 14:49:22,457 INFO L226 Difference]: Without dead ends: 580 [2022-11-23 14:49:22,458 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 475 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=321, Invalid=1571, Unknown=0, NotChecked=0, Total=1892 [2022-11-23 14:49:22,458 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 1193 mSDsluCounter, 457 mSDsCounter, 0 mSdLazyCounter, 1242 mSolverCounterSat, 201 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1193 SdHoareTripleChecker+Valid, 508 SdHoareTripleChecker+Invalid, 1443 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 201 IncrementalHoareTripleChecker+Valid, 1242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:22,459 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1193 Valid, 508 Invalid, 1443 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [201 Valid, 1242 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-23 14:49:22,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2022-11-23 14:49:22,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 329. [2022-11-23 14:49:22,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 240 states have (on average 1.4208333333333334) internal successors, (341), 272 states have internal predecessors, (341), 44 states have call successors, (44), 20 states have call predecessors, (44), 25 states have return successors, (60), 36 states have call predecessors, (60), 44 states have call successors, (60) [2022-11-23 14:49:22,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 445 transitions. [2022-11-23 14:49:22,476 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 445 transitions. Word has length 25 [2022-11-23 14:49:22,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:22,476 INFO L495 AbstractCegarLoop]: Abstraction has 329 states and 445 transitions. [2022-11-23 14:49:22,477 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 24 states have (on average 2.3333333333333335) internal successors, (56), 23 states have internal predecessors, (56), 6 states have call successors, (6), 2 states have call predecessors, (6), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:49:22,477 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 445 transitions. [2022-11-23 14:49:22,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-23 14:49:22,478 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:22,478 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:22,490 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2022-11-23 14:49:22,688 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-23 14:49:22,688 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:49:22,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:22,689 INFO L85 PathProgramCache]: Analyzing trace with hash 856309015, now seen corresponding path program 1 times [2022-11-23 14:49:22,689 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:22,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1842647585] [2022-11-23 14:49:22,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:22,689 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:22,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:22,747 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 14:49:22,747 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:22,747 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1842647585] [2022-11-23 14:49:22,747 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1842647585] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:49:22,748 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:49:22,748 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-11-23 14:49:22,748 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963145939] [2022-11-23 14:49:22,748 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:49:22,748 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-11-23 14:49:22,748 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:49:22,749 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-11-23 14:49:22,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-11-23 14:49:22,749 INFO L87 Difference]: Start difference. First operand 329 states and 445 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:49:22,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:22,810 INFO L93 Difference]: Finished difference Result 336 states and 446 transitions. [2022-11-23 14:49:22,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 14:49:22,810 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2022-11-23 14:49:22,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:22,812 INFO L225 Difference]: With dead ends: 336 [2022-11-23 14:49:22,812 INFO L226 Difference]: Without dead ends: 336 [2022-11-23 14:49:22,812 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 [2022-11-23 14:49:22,813 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 23 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 218 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:22,813 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 218 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-23 14:49:22,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 336 states. [2022-11-23 14:49:22,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 336 to 326. [2022-11-23 14:49:22,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 326 states, 239 states have (on average 1.4184100418410042) internal successors, (339), 270 states have internal predecessors, (339), 42 states have call successors, (42), 20 states have call predecessors, (42), 25 states have return successors, (58), 35 states have call predecessors, (58), 42 states have call successors, (58) [2022-11-23 14:49:22,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 439 transitions. [2022-11-23 14:49:22,824 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 439 transitions. Word has length 26 [2022-11-23 14:49:22,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:22,824 INFO L495 AbstractCegarLoop]: Abstraction has 326 states and 439 transitions. [2022-11-23 14:49:22,824 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 4 states have internal predecessors, (18), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:49:22,824 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 439 transitions. [2022-11-23 14:49:22,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-23 14:49:22,825 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:22,825 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:22,825 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2022-11-23 14:49:22,826 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr24REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:49:22,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:22,826 INFO L85 PathProgramCache]: Analyzing trace with hash -876853165, now seen corresponding path program 1 times [2022-11-23 14:49:22,826 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:22,826 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1004987105] [2022-11-23 14:49:22,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:22,827 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:22,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:23,796 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:49:23,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:23,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1004987105] [2022-11-23 14:49:23,796 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1004987105] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:49:23,796 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1291608666] [2022-11-23 14:49:23,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:23,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:23,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:49:23,798 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:49:23,827 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-23 14:49:24,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:24,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 74 conjunts are in the unsatisfiable core [2022-11-23 14:49:24,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:49:24,046 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-23 14:49:24,055 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:49:24,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:24,103 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 [2022-11-23 14:49:24,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:24,115 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 [2022-11-23 14:49:24,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:24,271 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 14 treesize of output 16 [2022-11-23 14:49:24,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:24,282 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 23 [2022-11-23 14:49:24,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:24,307 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 23 [2022-11-23 14:49:24,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:24,320 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 14 treesize of output 16 [2022-11-23 14:49:24,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:24,361 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 [2022-11-23 14:49:24,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:24,371 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 0 case distinctions, treesize of input 30 treesize of output 23 [2022-11-23 14:49:24,911 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-23 14:49:24,911 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 40 [2022-11-23 14:49:24,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:24,920 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2022-11-23 14:49:24,931 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 [2022-11-23 14:49:24,936 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:49:24,936 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 24 treesize of output 12 [2022-11-23 14:49:24,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:49:24,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:49:24,965 WARN L837 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_1190 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_remove_#t~mem4#1.base| v_ArrVal_1190) |c_ULTIMATE.start_remove_~x#1.base|) |c_ULTIMATE.start_remove_~x#1.offset|) 0)) (forall ((v_ArrVal_1189 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_remove_#t~mem4#1.base| v_ArrVal_1189) |c_ULTIMATE.start_remove_~x#1.base|) |c_ULTIMATE.start_remove_~x#1.offset|) 0))) is different from false [2022-11-23 14:49:24,978 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_remove_~x#1.base|) (+ |c_ULTIMATE.start_remove_~x#1.offset| 4)))) (and (forall ((v_ArrVal_1189 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| .cse0 v_ArrVal_1189) |c_ULTIMATE.start_remove_~x#1.base|) |c_ULTIMATE.start_remove_~x#1.offset|) 0)) (forall ((v_ArrVal_1190 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| .cse0 v_ArrVal_1190) |c_ULTIMATE.start_remove_~x#1.base|) |c_ULTIMATE.start_remove_~x#1.offset|) 0)))) is different from false [2022-11-23 14:49:24,997 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~x~0#1.base|) (+ |c_ULTIMATE.start_main_~x~0#1.offset| 4)))) (and (forall ((v_ArrVal_1190 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| .cse0 v_ArrVal_1190) |c_ULTIMATE.start_main_~x~0#1.base|) |c_ULTIMATE.start_main_~x~0#1.offset|) 0)) (forall ((v_ArrVal_1189 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| .cse0 v_ArrVal_1189) |c_ULTIMATE.start_main_~x~0#1.base|) |c_ULTIMATE.start_main_~x~0#1.offset|) 0)))) is different from false [2022-11-23 14:49:25,135 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1291608666] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:49:25,135 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [580914177] [2022-11-23 14:49:25,138 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-23 14:49:25,138 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:49:25,138 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:49:25,138 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:49:25,138 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:49:25,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,155 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 [2022-11-23 14:49:25,168 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 [2022-11-23 14:49:25,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,175 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 30 treesize of output 21 [2022-11-23 14:49:25,183 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 [2022-11-23 14:49:25,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,197 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 21 treesize of output 20 [2022-11-23 14:49:25,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,206 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 21 treesize of output 20 [2022-11-23 14:49:25,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,218 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 [2022-11-23 14:49:25,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,252 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 29 treesize of output 35 [2022-11-23 14:49:25,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,281 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 30 treesize of output 21 [2022-11-23 14:49:25,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,292 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:49:25,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,308 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:49:25,330 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,332 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,335 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:49:25,348 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,349 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 [2022-11-23 14:49:25,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,368 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:49:25,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,415 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 [2022-11-23 14:49:25,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,433 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,436 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:49:25,437 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:49:25,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,459 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:49:25,460 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:49:25,508 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,524 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,527 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,528 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 49 [2022-11-23 14:49:25,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,591 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 30 treesize of output 21 [2022-11-23 14:49:25,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,609 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:49:25,629 INFO L321 Elim1Store]: treesize reduction 33, result has 17.5 percent of original size [2022-11-23 14:49:25,629 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 188 treesize of output 133 [2022-11-23 14:49:25,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,654 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,657 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 62 [2022-11-23 14:49:25,700 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:49:25,707 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:49:25,715 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:49:25,730 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:49:25,738 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:49:25,750 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:49:25,751 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 23 treesize of output 22 [2022-11-23 14:49:25,773 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:49:25,790 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:49:25,791 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 23 treesize of output 26 [2022-11-23 14:49:25,862 INFO L321 Elim1Store]: treesize reduction 32, result has 58.4 percent of original size [2022-11-23 14:49:25,862 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 3 case distinctions, treesize of input 33 treesize of output 66 [2022-11-23 14:49:25,945 INFO L321 Elim1Store]: treesize reduction 68, result has 31.3 percent of original size [2022-11-23 14:49:25,946 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 5 case distinctions, treesize of input 28 treesize of output 45 [2022-11-23 14:49:25,984 INFO L321 Elim1Store]: treesize reduction 19, result has 5.0 percent of original size [2022-11-23 14:49:25,984 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 119 treesize of output 100 [2022-11-23 14:49:25,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:25,998 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:49:26,003 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-23 14:49:26,004 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 3 new quantified variables, introduced 1 case distinctions, treesize of input 177 treesize of output 128 [2022-11-23 14:49:26,030 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-23 14:49:26,045 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:49:26,052 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:49:26,065 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:49:26,083 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:49:26,094 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:49:26,095 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 23 treesize of output 22 [2022-11-23 14:49:26,105 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:49:26,133 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:49:26,149 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:49:26,149 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 23 treesize of output 26 [2022-11-23 14:49:26,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:26,434 INFO L321 Elim1Store]: treesize reduction 62, result has 34.7 percent of original size [2022-11-23 14:49:26,434 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 3 new quantified variables, introduced 2 case distinctions, treesize of input 163 treesize of output 130 [2022-11-23 14:49:26,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:26,496 INFO L321 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2022-11-23 14:49:26,496 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 3 new quantified variables, introduced 2 case distinctions, treesize of input 128 treesize of output 101 [2022-11-23 14:49:26,512 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2022-11-23 14:49:26,679 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 [2022-11-23 14:49:26,685 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 [2022-11-23 14:49:26,692 INFO L197 IcfgInterpreter]: Interpreting procedure is_list_containing_x with input of size 15 for LOIs [2022-11-23 14:49:26,701 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:49:31,949 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14530#(and (not (= (select |#valid| |ULTIMATE.start_remove_#t~mem7#1.base|) 1)) (= (mod (+ (* 255 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) 1) 256) 0) (<= 0 |ULTIMATE.start_main_~tail~0#1.base|) (= (select |#valid| |ULTIMATE.start_remove_~x#1.base|) 1) (= |ULTIMATE.start_remove_#in~x#1.offset| |ULTIMATE.start_main_~x~0#1.offset|) (= |ULTIMATE.start_main_~#list~0#1.base| |ULTIMATE.start_main_~x~0#1.base|) (<= (+ 8 |ULTIMATE.start_remove_~x#1.offset|) (select |#length| |ULTIMATE.start_remove_~x#1.base|)) (<= 0 |ULTIMATE.start_main_~tail~0#1.offset|) (= |ULTIMATE.start_remove_#in~x#1.base| |ULTIMATE.start_main_~x~0#1.base|) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4)) |ULTIMATE.start_remove_#t~mem8#1.offset|) (< |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 256) (<= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#list~0#1.base|) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_remove_~x#1.offset|) (<= |ULTIMATE.start_main_~#list~0#1.offset| 0) (or (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) |ULTIMATE.start_remove_~x#1.offset|) 0)) (not (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) |ULTIMATE.start_remove_~x#1.offset|) 0))) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) |ULTIMATE.start_remove_~x#1.offset|) |ULTIMATE.start_remove_#t~mem7#1.base|) (= |ULTIMATE.start_main_~#list~0#1.offset| |ULTIMATE.start_main_~x~0#1.offset|) (= |ULTIMATE.start_remove_#in~x#1.offset| |ULTIMATE.start_remove_~x#1.offset|) (= |ULTIMATE.start_remove_#in~x#1.base| |ULTIMATE.start_remove_~x#1.base|) (or (and (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) |ULTIMATE.start_remove_~x#1.offset|) (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4))) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4)) (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) |ULTIMATE.start_remove_~x#1.offset|))) (and (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) |ULTIMATE.start_remove_~x#1.offset|) (select (select |#memory_$Pointer$.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4))) (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4)))) (= (select |#valid| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4))) 1) (= (select (select |#memory_$Pointer$.offset| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4))) (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4))) (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) |ULTIMATE.start_remove_~x#1.offset|)) (<= 0 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4))) (<= (+ (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4)) 4) (select |#length| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4)))) (or (not (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4)) 0)) (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4)) 0))))) (= |ULTIMATE.start_remove_#t~mem7#1.offset| (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_remove_~x#1.base|) |ULTIMATE.start_remove_~x#1.offset|)) (= |ULTIMATE.start_remove_#t~mem8#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_remove_~x#1.base|) (+ |ULTIMATE.start_remove_~x#1.offset| 4))) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0) (<= |ULTIMATE.start_main_~tail~0#1.offset| 0))' at error location [2022-11-23 14:49:31,949 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:49:31,950 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:49:31,950 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13] total 23 [2022-11-23 14:49:31,950 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [64569357] [2022-11-23 14:49:31,950 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:49:31,950 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-11-23 14:49:31,950 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:49:31,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-11-23 14:49:31,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=1811, Unknown=3, NotChecked=264, Total=2256 [2022-11-23 14:49:31,952 INFO L87 Difference]: Start difference. First operand 326 states and 439 transitions. Second operand has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 20 states have internal predecessors, (42), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:49:35,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:35,189 INFO L93 Difference]: Finished difference Result 542 states and 665 transitions. [2022-11-23 14:49:35,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-11-23 14:49:35,190 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 20 states have internal predecessors, (42), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 25 [2022-11-23 14:49:35,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:35,193 INFO L225 Difference]: With dead ends: 542 [2022-11-23 14:49:35,193 INFO L226 Difference]: Without dead ends: 542 [2022-11-23 14:49:35,195 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 1207 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=432, Invalid=3867, Unknown=3, NotChecked=390, Total=4692 [2022-11-23 14:49:35,196 INFO L413 NwaCegarLoop]: 120 mSDtfsCounter, 923 mSDsluCounter, 901 mSDsCounter, 0 mSdLazyCounter, 1391 mSolverCounterSat, 236 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 933 SdHoareTripleChecker+Valid, 1021 SdHoareTripleChecker+Invalid, 1627 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 236 IncrementalHoareTripleChecker+Valid, 1391 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:35,196 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [933 Valid, 1021 Invalid, 1627 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [236 Valid, 1391 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-11-23 14:49:35,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2022-11-23 14:49:35,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 335. [2022-11-23 14:49:35,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 245 states have (on average 1.4081632653061225) internal successors, (345), 276 states have internal predecessors, (345), 43 states have call successors, (43), 22 states have call predecessors, (43), 27 states have return successors, (59), 36 states have call predecessors, (59), 43 states have call successors, (59) [2022-11-23 14:49:35,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 447 transitions. [2022-11-23 14:49:35,211 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 447 transitions. Word has length 25 [2022-11-23 14:49:35,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:35,212 INFO L495 AbstractCegarLoop]: Abstraction has 335 states and 447 transitions. [2022-11-23 14:49:35,212 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 20 states have internal predecessors, (42), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:49:35,212 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 447 transitions. [2022-11-23 14:49:35,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-23 14:49:35,213 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:35,213 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:35,225 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-23 14:49:35,419 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-23 14:49:35,420 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr30REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:49:35,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:35,420 INFO L85 PathProgramCache]: Analyzing trace with hash -46852464, now seen corresponding path program 1 times [2022-11-23 14:49:35,420 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:35,420 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1364689441] [2022-11-23 14:49:35,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:35,421 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:35,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:35,632 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:49:35,632 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:35,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1364689441] [2022-11-23 14:49:35,633 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1364689441] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:49:35,633 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:49:35,633 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-23 14:49:35,633 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661621296] [2022-11-23 14:49:35,633 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:49:35,634 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 14:49:35,634 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:49:35,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 14:49:35,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:49:35,635 INFO L87 Difference]: Start difference. First operand 335 states and 447 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:49:35,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:35,838 INFO L93 Difference]: Finished difference Result 341 states and 449 transitions. [2022-11-23 14:49:35,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:49:35,839 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 26 [2022-11-23 14:49:35,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:35,841 INFO L225 Difference]: With dead ends: 341 [2022-11-23 14:49:35,841 INFO L226 Difference]: Without dead ends: 341 [2022-11-23 14:49:35,842 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2022-11-23 14:49:35,842 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 45 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 246 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:35,843 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 246 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:49:35,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 341 states. [2022-11-23 14:49:35,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 341 to 333. [2022-11-23 14:49:35,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 243 states have (on average 1.3991769547325104) internal successors, (340), 274 states have internal predecessors, (340), 43 states have call successors, (43), 22 states have call predecessors, (43), 27 states have return successors, (59), 36 states have call predecessors, (59), 43 states have call successors, (59) [2022-11-23 14:49:35,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 442 transitions. [2022-11-23 14:49:35,855 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 442 transitions. Word has length 26 [2022-11-23 14:49:35,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:35,857 INFO L495 AbstractCegarLoop]: Abstraction has 333 states and 442 transitions. [2022-11-23 14:49:35,858 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:49:35,858 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 442 transitions. [2022-11-23 14:49:35,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-11-23 14:49:35,859 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:35,859 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:35,860 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2022-11-23 14:49:35,860 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr36REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:49:35,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:35,862 INFO L85 PathProgramCache]: Analyzing trace with hash -2066920866, now seen corresponding path program 1 times [2022-11-23 14:49:35,862 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:35,862 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [129732518] [2022-11-23 14:49:35,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:35,862 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:35,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:36,032 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:49:36,033 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:36,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [129732518] [2022-11-23 14:49:36,033 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [129732518] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:49:36,033 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:49:36,033 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-23 14:49:36,033 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883540205] [2022-11-23 14:49:36,034 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:49:36,034 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-23 14:49:36,034 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:49:36,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-23 14:49:36,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-23 14:49:36,035 INFO L87 Difference]: Start difference. First operand 333 states and 442 transitions. Second operand has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:49:36,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:36,333 INFO L93 Difference]: Finished difference Result 356 states and 462 transitions. [2022-11-23 14:49:36,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-23 14:49:36,334 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2022-11-23 14:49:36,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:36,336 INFO L225 Difference]: With dead ends: 356 [2022-11-23 14:49:36,336 INFO L226 Difference]: Without dead ends: 356 [2022-11-23 14:49:36,337 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2022-11-23 14:49:36,337 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 96 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 199 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 100 SdHoareTripleChecker+Valid, 266 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 199 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:36,338 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [100 Valid, 266 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 199 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:49:36,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2022-11-23 14:49:36,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 342. [2022-11-23 14:49:36,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 342 states, 249 states have (on average 1.3734939759036144) internal successors, (342), 281 states have internal predecessors, (342), 46 states have call successors, (46), 22 states have call predecessors, (46), 27 states have return successors, (62), 38 states have call predecessors, (62), 46 states have call successors, (62) [2022-11-23 14:49:36,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 342 states to 342 states and 450 transitions. [2022-11-23 14:49:36,352 INFO L78 Accepts]: Start accepts. Automaton has 342 states and 450 transitions. Word has length 28 [2022-11-23 14:49:36,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:36,352 INFO L495 AbstractCegarLoop]: Abstraction has 342 states and 450 transitions. [2022-11-23 14:49:36,352 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 7 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:49:36,353 INFO L276 IsEmpty]: Start isEmpty. Operand 342 states and 450 transitions. [2022-11-23 14:49:36,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-11-23 14:49:36,353 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:36,354 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:36,354 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2022-11-23 14:49:36,354 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:49:36,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:36,355 INFO L85 PathProgramCache]: Analyzing trace with hash -2027702963, now seen corresponding path program 2 times [2022-11-23 14:49:36,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:36,355 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1925343355] [2022-11-23 14:49:36,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:36,356 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:36,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:37,678 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 13 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:49:37,678 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:37,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1925343355] [2022-11-23 14:49:37,679 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1925343355] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:49:37,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1044216964] [2022-11-23 14:49:37,679 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:49:37,680 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:37,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:49:37,681 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:49:37,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-23 14:49:37,960 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-23 14:49:37,960 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:49:37,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 294 conjuncts, 63 conjunts are in the unsatisfiable core [2022-11-23 14:49:37,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:49:38,325 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:49:38,336 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:49:38,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:38,445 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 22 [2022-11-23 14:49:38,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:38,453 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 29 treesize of output 28 [2022-11-23 14:49:39,040 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:49:39,043 INFO L321 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2022-11-23 14:49:39,044 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 78 treesize of output 41 [2022-11-23 14:49:39,065 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:49:39,066 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 0 case distinctions, treesize of input 41 treesize of output 18 [2022-11-23 14:49:39,073 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:49:39,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:49:39,514 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:49:39,515 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 5 new quantified variables, introduced 6 case distinctions, treesize of input 1679 treesize of output 1428 [2022-11-23 14:49:39,570 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 1432 treesize of output 1384 [2022-11-23 14:49:45,196 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 738 treesize of output 726 [2022-11-23 14:49:45,512 INFO L321 Elim1Store]: treesize reduction 389, result has 16.5 percent of original size [2022-11-23 14:49:45,513 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 11 new quantified variables, introduced 45 case distinctions, treesize of input 4148 treesize of output 3718 [2022-11-23 14:49:47,802 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:49:47,803 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1044216964] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:49:47,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [941123839] [2022-11-23 14:49:47,804 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2022-11-23 14:49:47,804 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:49:47,805 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 14:49:47,806 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:49:47,806 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 13] total 36 [2022-11-23 14:49:47,806 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932265388] [2022-11-23 14:49:47,806 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:49:47,806 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-11-23 14:49:47,806 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:49:47,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-11-23 14:49:47,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=1192, Unknown=0, NotChecked=0, Total=1332 [2022-11-23 14:49:47,807 INFO L87 Difference]: Start difference. First operand 342 states and 450 transitions. Second operand has 37 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 30 states have internal predecessors, (69), 7 states have call successors, (7), 7 states have call predecessors, (7), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:49:49,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:49:49,701 INFO L93 Difference]: Finished difference Result 346 states and 446 transitions. [2022-11-23 14:49:49,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-23 14:49:49,704 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 30 states have internal predecessors, (69), 7 states have call successors, (7), 7 states have call predecessors, (7), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-11-23 14:49:49,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:49:49,706 INFO L225 Difference]: With dead ends: 346 [2022-11-23 14:49:49,707 INFO L226 Difference]: Without dead ends: 346 [2022-11-23 14:49:49,707 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=288, Invalid=1874, Unknown=0, NotChecked=0, Total=2162 [2022-11-23 14:49:49,708 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 471 mSDsluCounter, 857 mSDsCounter, 0 mSdLazyCounter, 1123 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 471 SdHoareTripleChecker+Valid, 946 SdHoareTripleChecker+Invalid, 1218 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 1123 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:49:49,708 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [471 Valid, 946 Invalid, 1218 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 1123 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-11-23 14:49:49,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2022-11-23 14:49:49,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 330. [2022-11-23 14:49:49,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 330 states, 240 states have (on average 1.3666666666666667) internal successors, (328), 272 states have internal predecessors, (328), 44 states have call successors, (44), 21 states have call predecessors, (44), 26 states have return successors, (60), 36 states have call predecessors, (60), 44 states have call successors, (60) [2022-11-23 14:49:49,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 330 states to 330 states and 432 transitions. [2022-11-23 14:49:49,721 INFO L78 Accepts]: Start accepts. Automaton has 330 states and 432 transitions. Word has length 30 [2022-11-23 14:49:49,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:49:49,721 INFO L495 AbstractCegarLoop]: Abstraction has 330 states and 432 transitions. [2022-11-23 14:49:49,722 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 34 states have (on average 2.0294117647058822) internal successors, (69), 30 states have internal predecessors, (69), 7 states have call successors, (7), 7 states have call predecessors, (7), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-11-23 14:49:49,722 INFO L276 IsEmpty]: Start isEmpty. Operand 330 states and 432 transitions. [2022-11-23 14:49:49,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-11-23 14:49:49,723 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:49:49,723 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:49:49,736 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-11-23 14:49:49,930 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:49,930 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:49:49,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:49:49,931 INFO L85 PathProgramCache]: Analyzing trace with hash 930474183, now seen corresponding path program 1 times [2022-11-23 14:49:49,931 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:49:49,931 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198165397] [2022-11-23 14:49:49,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:49,932 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:49:49,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:50,858 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:49:50,858 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:49:50,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198165397] [2022-11-23 14:49:50,858 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [198165397] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:49:50,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364346283] [2022-11-23 14:49:50,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:49:50,859 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:49:50,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:49:50,868 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:49:50,887 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-23 14:49:51,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:49:51,093 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 66 conjunts are in the unsatisfiable core [2022-11-23 14:49:51,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:49:51,247 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:49:51,255 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:49:51,358 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-23 14:49:51,358 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 14 treesize of output 20 [2022-11-23 14:49:51,383 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-23 14:49:51,384 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 14 treesize of output 20 [2022-11-23 14:49:52,008 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:49:52,009 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 10 [2022-11-23 14:49:52,014 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:49:52,017 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:49:52,017 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 10 [2022-11-23 14:49:52,059 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:49:52,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:50:00,845 WARN L233 SmtUtils]: Spent 6.02s on a formula simplification that was a NOOP. DAG size: 27 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:50:06,963 WARN L233 SmtUtils]: Spent 6.02s on a formula simplification that was a NOOP. DAG size: 31 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:50:16,154 WARN L233 SmtUtils]: Spent 8.53s on a formula simplification that was a NOOP. DAG size: 64 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:50:16,201 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:50:16,201 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 111 treesize of output 81 [2022-11-23 14:50:16,212 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:50:16,212 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 32 [2022-11-23 14:50:16,229 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:50:16,230 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 136 treesize of output 117 [2022-11-23 14:50:16,279 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:50:16,279 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 80 treesize of output 96 [2022-11-23 14:50:16,292 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 102 treesize of output 78 [2022-11-23 14:50:16,320 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:50:16,321 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 50 treesize of output 50 [2022-11-23 14:50:16,834 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:50:16,835 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 89 treesize of output 69 [2022-11-23 14:50:16,849 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:50:16,849 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 32 [2022-11-23 14:50:16,880 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:50:16,880 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 111 treesize of output 98 [2022-11-23 14:50:16,949 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:50:16,950 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 3 new quantified variables, introduced 3 case distinctions, treesize of input 80 treesize of output 96 [2022-11-23 14:50:16,964 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 71 [2022-11-23 14:50:16,990 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:50:16,990 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 50 treesize of output 50 [2022-11-23 14:50:17,417 INFO L321 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2022-11-23 14:50:17,417 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 89 treesize of output 1 [2022-11-23 14:50:17,428 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:50:17,429 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 111 treesize of output 71 [2022-11-23 14:50:17,511 INFO L321 Elim1Store]: treesize reduction 43, result has 43.4 percent of original size [2022-11-23 14:50:17,512 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 5 new quantified variables, introduced 6 case distinctions, treesize of input 174 treesize of output 160 [2022-11-23 14:50:17,555 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:50:17,555 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 112 treesize of output 120 [2022-11-23 14:50:17,816 INFO L321 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2022-11-23 14:50:17,817 INFO L350 Elim1Store]: Elim1 eliminated variable 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 111 treesize of output 1 [2022-11-23 14:50:17,830 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:50:17,830 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 179 treesize of output 120 [2022-11-23 14:50:17,844 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:50:17,844 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 109 treesize of output 110 [2022-11-23 14:50:17,899 INFO L321 Elim1Store]: treesize reduction 20, result has 45.9 percent of original size [2022-11-23 14:50:17,900 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 3 case distinctions, treesize of input 252 treesize of output 210 [2022-11-23 14:50:17,953 INFO L321 Elim1Store]: treesize reduction 20, result has 45.9 percent of original size [2022-11-23 14:50:17,953 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 3 new quantified variables, introduced 3 case distinctions, treesize of input 212 treesize of output 208 [2022-11-23 14:50:17,969 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 192 treesize of output 176 [2022-11-23 14:50:17,989 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:50:17,990 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 167 treesize of output 172 [2022-11-23 14:50:18,036 INFO L321 Elim1Store]: treesize reduction 14, result has 51.7 percent of original size [2022-11-23 14:50:18,036 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 174 treesize of output 172 [2022-11-23 14:50:18,249 INFO L321 Elim1Store]: treesize reduction 9, result has 10.0 percent of original size [2022-11-23 14:50:18,249 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 111 treesize of output 1 [2022-11-23 14:50:18,524 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:50:18,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1364346283] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:50:18,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1245292661] [2022-11-23 14:50:18,526 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-23 14:50:18,526 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:50:18,526 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 14:50:18,527 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:50:18,527 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 16, 17] total 38 [2022-11-23 14:50:18,527 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [341562088] [2022-11-23 14:50:18,527 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:50:18,528 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-23 14:50:18,528 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:50:18,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-23 14:50:18,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1247, Unknown=3, NotChecked=0, Total=1406 [2022-11-23 14:50:18,529 INFO L87 Difference]: Start difference. First operand 330 states and 432 transitions. Second operand has 38 states, 36 states have (on average 1.8333333333333333) internal successors, (66), 35 states have internal predecessors, (66), 6 states have call successors, (6), 1 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:50:26,125 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.10s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-11-23 14:50:28,806 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-11-23 14:50:31,691 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [1] [2022-11-23 14:50:38,203 WARN L233 SmtUtils]: Spent 6.39s on a formula simplification. DAG size of input: 83 DAG size of output: 69 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:50:49,034 WARN L233 SmtUtils]: Spent 10.59s on a formula simplification. DAG size of input: 97 DAG size of output: 78 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:50:59,835 WARN L233 SmtUtils]: Spent 10.53s on a formula simplification. DAG size of input: 101 DAG size of output: 82 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:51:03,719 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-11-23 14:51:06,199 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-11-23 14:51:08,274 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.05s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-11-23 14:51:10,375 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.08s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-11-23 14:51:12,459 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.08s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-11-23 14:51:12,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:51:12,849 INFO L93 Difference]: Finished difference Result 395 states and 508 transitions. [2022-11-23 14:51:12,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-23 14:51:12,849 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 36 states have (on average 1.8333333333333333) internal successors, (66), 35 states have internal predecessors, (66), 6 states have call successors, (6), 1 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 29 [2022-11-23 14:51:12,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:51:12,852 INFO L225 Difference]: With dead ends: 395 [2022-11-23 14:51:12,852 INFO L226 Difference]: Without dead ends: 393 [2022-11-23 14:51:12,854 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 36 SyntacticMatches, 3 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1004 ImplicationChecksByTransitivity, 58.2s TimeCoverageRelationStatistics Valid=508, Invalid=3268, Unknown=6, NotChecked=0, Total=3782 [2022-11-23 14:51:12,854 INFO L413 NwaCegarLoop]: 80 mSDtfsCounter, 342 mSDsluCounter, 914 mSDsCounter, 0 mSdLazyCounter, 1311 mSolverCounterSat, 91 mSolverCounterUnsat, 32 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 19.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 351 SdHoareTripleChecker+Valid, 994 SdHoareTripleChecker+Invalid, 1434 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 1311 IncrementalHoareTripleChecker+Invalid, 32 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 20.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:51:12,855 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [351 Valid, 994 Invalid, 1434 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 1311 Invalid, 32 Unknown, 0 Unchecked, 20.2s Time] [2022-11-23 14:51:12,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 393 states. [2022-11-23 14:51:12,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 393 to 334. [2022-11-23 14:51:12,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 334 states, 243 states have (on average 1.3621399176954732) internal successors, (331), 275 states have internal predecessors, (331), 44 states have call successors, (44), 22 states have call predecessors, (44), 27 states have return successors, (60), 36 states have call predecessors, (60), 44 states have call successors, (60) [2022-11-23 14:51:12,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 334 states to 334 states and 435 transitions. [2022-11-23 14:51:12,869 INFO L78 Accepts]: Start accepts. Automaton has 334 states and 435 transitions. Word has length 29 [2022-11-23 14:51:12,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:51:12,869 INFO L495 AbstractCegarLoop]: Abstraction has 334 states and 435 transitions. [2022-11-23 14:51:12,870 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 36 states have (on average 1.8333333333333333) internal successors, (66), 35 states have internal predecessors, (66), 6 states have call successors, (6), 1 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:51:12,870 INFO L276 IsEmpty]: Start isEmpty. Operand 334 states and 435 transitions. [2022-11-23 14:51:12,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-23 14:51:12,871 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:51:12,871 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:51:12,883 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-11-23 14:51:13,077 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-11-23 14:51:13,078 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr24REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:51:13,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:51:13,078 INFO L85 PathProgramCache]: Analyzing trace with hash 1188508809, now seen corresponding path program 1 times [2022-11-23 14:51:13,078 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:51:13,079 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [76759994] [2022-11-23 14:51:13,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:51:13,079 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:51:13,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:51:13,764 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:51:13,764 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:51:13,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [76759994] [2022-11-23 14:51:13,764 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [76759994] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:51:13,764 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1823061934] [2022-11-23 14:51:13,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:51:13,764 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:51:13,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:51:13,766 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:51:13,768 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-23 14:51:13,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:51:13,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 62 conjunts are in the unsatisfiable core [2022-11-23 14:51:13,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:51:14,130 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-23 14:51:14,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:51:14,212 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 [2022-11-23 14:51:14,263 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-23 14:51:14,264 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 25 [2022-11-23 14:51:14,270 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-23 14:51:14,886 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 [2022-11-23 14:51:15,046 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 25 treesize of output 13 [2022-11-23 14:51:15,053 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:51:15,054 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:51:15,277 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 10 treesize of output 4 [2022-11-23 14:51:15,289 INFO L321 Elim1Store]: treesize reduction 5, result has 58.3 percent of original size [2022-11-23 14:51:15,289 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 16 treesize of output 15 [2022-11-23 14:51:15,804 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 10 treesize of output 4 [2022-11-23 14:51:15,823 INFO L321 Elim1Store]: treesize reduction 5, result has 58.3 percent of original size [2022-11-23 14:51:15,824 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 16 treesize of output 15 [2022-11-23 14:51:16,041 WARN L837 $PredicateComparison]: unable to prove that (and (or (and (= |c_ULTIMATE.start_main_~n~0#1.offset| |c_ULTIMATE.start_main_~#list~0#1.offset|) (= |c_ULTIMATE.start_main_~#list~0#1.base| |c_ULTIMATE.start_main_~n~0#1.base|)) (forall ((v_ArrVal_1481 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~tail~0#1.base| v_ArrVal_1481) |c_ULTIMATE.start_main_~n~0#1.base|) |c_ULTIMATE.start_main_~n~0#1.offset|) |c_ULTIMATE.start_main_~#list~0#1.base|))) (or (and (= |c_ULTIMATE.start_main_~#list~0#1.base| |c_ULTIMATE.start_main_~x~0#1.base|) (= |c_ULTIMATE.start_main_~x~0#1.offset| |c_ULTIMATE.start_main_~#list~0#1.offset|)) (forall ((v_ArrVal_1481 (Array Int Int))) (= |c_ULTIMATE.start_main_~#list~0#1.base| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~tail~0#1.base| v_ArrVal_1481) |c_ULTIMATE.start_main_~x~0#1.base|) |c_ULTIMATE.start_main_~x~0#1.offset|))))) is different from false [2022-11-23 14:51:16,295 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:51:16,295 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 23 treesize of output 29 [2022-11-23 14:51:16,301 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 30 treesize of output 22 [2022-11-23 14:51:16,307 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2022-11-23 14:51:16,321 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:51:16,330 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:51:16,330 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 23 treesize of output 29 [2022-11-23 14:51:16,366 INFO L321 Elim1Store]: treesize reduction 4, result has 63.6 percent of original size [2022-11-23 14:51:16,367 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 29 [2022-11-23 14:51:16,379 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 14:51:16,496 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:51:16,496 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1823061934] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:51:16,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [647806188] [2022-11-23 14:51:16,499 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:51:16,499 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:51:16,499 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 14:51:16,500 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:51:16,500 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 17, 17] total 37 [2022-11-23 14:51:16,500 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584584343] [2022-11-23 14:51:16,500 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:51:16,500 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-11-23 14:51:16,501 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:51:16,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-11-23 14:51:16,502 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=1173, Unknown=6, NotChecked=70, Total=1406 [2022-11-23 14:51:16,502 INFO L87 Difference]: Start difference. First operand 334 states and 435 transitions. Second operand has 38 states, 35 states have (on average 1.8857142857142857) internal successors, (66), 35 states have internal predecessors, (66), 5 states have call successors, (5), 2 states have call predecessors, (5), 6 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-23 14:51:21,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:51:21,893 INFO L93 Difference]: Finished difference Result 498 states and 668 transitions. [2022-11-23 14:51:21,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-23 14:51:21,894 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 35 states have (on average 1.8857142857142857) internal successors, (66), 35 states have internal predecessors, (66), 5 states have call successors, (5), 2 states have call predecessors, (5), 6 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 31 [2022-11-23 14:51:21,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:51:21,897 INFO L225 Difference]: With dead ends: 498 [2022-11-23 14:51:21,898 INFO L226 Difference]: Without dead ends: 498 [2022-11-23 14:51:21,899 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1050 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=684, Invalid=3736, Unknown=6, NotChecked=130, Total=4556 [2022-11-23 14:51:21,900 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 553 mSDsluCounter, 1014 mSDsCounter, 0 mSdLazyCounter, 2209 mSolverCounterSat, 147 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 567 SdHoareTripleChecker+Valid, 1086 SdHoareTripleChecker+Invalid, 2631 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 147 IncrementalHoareTripleChecker+Valid, 2209 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 273 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2022-11-23 14:51:21,900 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [567 Valid, 1086 Invalid, 2631 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [147 Valid, 2209 Invalid, 2 Unknown, 273 Unchecked, 3.0s Time] [2022-11-23 14:51:21,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 498 states. [2022-11-23 14:51:21,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 498 to 340. [2022-11-23 14:51:21,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 340 states, 248 states have (on average 1.3588709677419355) internal successors, (337), 280 states have internal predecessors, (337), 45 states have call successors, (45), 22 states have call predecessors, (45), 27 states have return successors, (59), 37 states have call predecessors, (59), 45 states have call successors, (59) [2022-11-23 14:51:21,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 340 states to 340 states and 441 transitions. [2022-11-23 14:51:21,915 INFO L78 Accepts]: Start accepts. Automaton has 340 states and 441 transitions. Word has length 31 [2022-11-23 14:51:21,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:51:21,916 INFO L495 AbstractCegarLoop]: Abstraction has 340 states and 441 transitions. [2022-11-23 14:51:21,916 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 35 states have (on average 1.8857142857142857) internal successors, (66), 35 states have internal predecessors, (66), 5 states have call successors, (5), 2 states have call predecessors, (5), 6 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-23 14:51:21,916 INFO L276 IsEmpty]: Start isEmpty. Operand 340 states and 441 transitions. [2022-11-23 14:51:21,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-23 14:51:21,917 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:51:21,917 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:51:21,927 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2022-11-23 14:51:22,124 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-11-23 14:51:22,124 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr25REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:51:22,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:51:22,124 INFO L85 PathProgramCache]: Analyzing trace with hash 1188508810, now seen corresponding path program 1 times [2022-11-23 14:51:22,125 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:51:22,125 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1189377199] [2022-11-23 14:51:22,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:51:22,125 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:51:22,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:51:23,104 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:51:23,104 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:51:23,104 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1189377199] [2022-11-23 14:51:23,104 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1189377199] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:51:23,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1129072402] [2022-11-23 14:51:23,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:51:23,105 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:51:23,105 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:51:23,106 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:51:23,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-23 14:51:23,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:51:23,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 74 conjunts are in the unsatisfiable core [2022-11-23 14:51:23,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:51:23,461 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:51:23,477 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-23 14:51:23,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:51:23,539 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 [2022-11-23 14:51:23,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:51:23,551 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 [2022-11-23 14:51:23,597 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-23 14:51:23,597 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 14 treesize of output 20 [2022-11-23 14:51:23,619 INFO L321 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2022-11-23 14:51:23,619 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 14 treesize of output 20 [2022-11-23 14:51:23,632 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 14:51:23,638 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 14:51:24,304 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-23 14:51:24,304 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 59 treesize of output 41 [2022-11-23 14:51:24,319 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-23 14:51:24,320 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 1 case distinctions, treesize of input 26 treesize of output 16 [2022-11-23 14:51:24,381 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:51:24,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:51:24,822 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:51:24,822 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 34 treesize of output 38 [2022-11-23 14:51:48,115 WARN L233 SmtUtils]: Spent 20.30s on a formula simplification. DAG size of input: 46 DAG size of output: 40 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:51:59,592 WARN L233 SmtUtils]: Spent 11.20s on a formula simplification that was a NOOP. DAG size: 44 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:51:59,806 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:51:59,806 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 34 treesize of output 38 [2022-11-23 14:52:07,405 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:52:07,406 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 74 treesize of output 53 [2022-11-23 14:52:07,452 INFO L321 Elim1Store]: treesize reduction 12, result has 63.6 percent of original size [2022-11-23 14:52:07,453 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 3 case distinctions, treesize of input 118 treesize of output 108 [2022-11-23 14:52:07,494 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:52:07,494 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 92 treesize of output 108 [2022-11-23 14:52:07,729 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:52:07,729 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 74 treesize of output 53 [2022-11-23 14:52:07,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:52:07,735 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:52:07,748 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:52:07,749 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 33 [2022-11-23 14:52:07,755 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 16 [2022-11-23 14:52:07,774 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:52:07,774 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 97 treesize of output 76 [2022-11-23 14:52:07,782 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:52:07,792 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:52:07,792 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 32 treesize of output 38 [2022-11-23 14:52:07,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:52:07,800 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2022-11-23 14:52:07,810 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:52:07,811 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 30 [2022-11-23 14:52:07,816 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 17 [2022-11-23 14:52:07,825 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 7 [2022-11-23 14:52:07,836 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:52:07,845 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:52:07,845 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 97 treesize of output 76 [2022-11-23 14:52:07,853 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:52:07,862 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:52:07,863 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 32 treesize of output 38 [2022-11-23 14:52:07,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:52:07,871 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 34 [2022-11-23 14:52:07,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:52:07,880 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 18 treesize of output 14 [2022-11-23 14:52:07,885 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2022-11-23 14:52:07,890 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2022-11-23 14:52:07,900 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:52:07,903 INFO L321 Elim1Store]: treesize reduction 18, result has 5.3 percent of original size [2022-11-23 14:52:07,903 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 99 treesize of output 1 [2022-11-23 14:52:07,910 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:52:07,914 INFO L321 Elim1Store]: treesize reduction 18, result has 5.3 percent of original size [2022-11-23 14:52:07,914 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 72 treesize of output 1 [2022-11-23 14:52:07,921 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:52:07,924 INFO L321 Elim1Store]: treesize reduction 18, result has 5.3 percent of original size [2022-11-23 14:52:07,925 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 99 treesize of output 1 [2022-11-23 14:52:07,931 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:52:07,935 INFO L321 Elim1Store]: treesize reduction 18, result has 5.3 percent of original size [2022-11-23 14:52:07,936 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 99 treesize of output 1 [2022-11-23 14:52:07,942 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:52:07,946 INFO L321 Elim1Store]: treesize reduction 18, result has 5.3 percent of original size [2022-11-23 14:52:07,946 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 99 treesize of output 1 [2022-11-23 14:52:07,953 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:52:07,964 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:52:07,965 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 74 treesize of output 53 [2022-11-23 14:52:07,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:52:07,971 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:52:07,983 INFO L321 Elim1Store]: treesize reduction 8, result has 33.3 percent of original size [2022-11-23 14:52:07,984 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 22 [2022-11-23 14:52:07,990 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 4 [2022-11-23 14:52:08,219 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:52:08,220 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1129072402] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:52:08,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1402798980] [2022-11-23 14:52:08,221 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:52:08,222 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:52:08,222 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 14:52:08,223 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:52:08,223 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16, 17] total 41 [2022-11-23 14:52:08,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223673443] [2022-11-23 14:52:08,224 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:52:08,224 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-23 14:52:08,224 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:52:08,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-23 14:52:08,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=1553, Unknown=6, NotChecked=0, Total=1722 [2022-11-23 14:52:08,226 INFO L87 Difference]: Start difference. First operand 340 states and 441 transitions. Second operand has 42 states, 39 states have (on average 2.0) internal successors, (78), 39 states have internal predecessors, (78), 6 states have call successors, (6), 1 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:52:15,395 WARN L233 SmtUtils]: Spent 5.66s on a formula simplification. DAG size of input: 167 DAG size of output: 110 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:52:33,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:52:33,902 INFO L93 Difference]: Finished difference Result 499 states and 654 transitions. [2022-11-23 14:52:33,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-23 14:52:33,907 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 39 states have (on average 2.0) internal successors, (78), 39 states have internal predecessors, (78), 6 states have call successors, (6), 1 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 31 [2022-11-23 14:52:33,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:52:33,909 INFO L225 Difference]: With dead ends: 499 [2022-11-23 14:52:33,909 INFO L226 Difference]: Without dead ends: 499 [2022-11-23 14:52:33,911 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1209 ImplicationChecksByTransitivity, 53.3s TimeCoverageRelationStatistics Valid=633, Invalid=4331, Unknown=6, NotChecked=0, Total=4970 [2022-11-23 14:52:33,912 INFO L413 NwaCegarLoop]: 100 mSDtfsCounter, 503 mSDsluCounter, 1412 mSDsCounter, 0 mSdLazyCounter, 3448 mSolverCounterSat, 159 mSolverCounterUnsat, 6 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 519 SdHoareTripleChecker+Valid, 1512 SdHoareTripleChecker+Invalid, 3613 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 3448 IncrementalHoareTripleChecker+Invalid, 6 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.9s IncrementalHoareTripleChecker+Time [2022-11-23 14:52:33,912 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [519 Valid, 1512 Invalid, 3613 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 3448 Invalid, 6 Unknown, 0 Unchecked, 14.9s Time] [2022-11-23 14:52:33,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 499 states. [2022-11-23 14:52:33,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 499 to 367. [2022-11-23 14:52:33,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 267 states have (on average 1.3595505617977528) internal successors, (363), 302 states have internal predecessors, (363), 50 states have call successors, (50), 23 states have call predecessors, (50), 30 states have return successors, (72), 41 states have call predecessors, (72), 50 states have call successors, (72) [2022-11-23 14:52:33,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 485 transitions. [2022-11-23 14:52:33,926 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 485 transitions. Word has length 31 [2022-11-23 14:52:33,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:52:33,926 INFO L495 AbstractCegarLoop]: Abstraction has 367 states and 485 transitions. [2022-11-23 14:52:33,927 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 39 states have (on average 2.0) internal successors, (78), 39 states have internal predecessors, (78), 6 states have call successors, (6), 1 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:52:33,927 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 485 transitions. [2022-11-23 14:52:33,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-23 14:52:33,928 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:52:33,928 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:52:33,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-23 14:52:34,134 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:52:34,134 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr26REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:52:34,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:52:34,135 INFO L85 PathProgramCache]: Analyzing trace with hash -412716431, now seen corresponding path program 1 times [2022-11-23 14:52:34,135 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:52:34,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944133060] [2022-11-23 14:52:34,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:52:34,135 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:52:34,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:52:34,290 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:52:34,290 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:52:34,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944133060] [2022-11-23 14:52:34,290 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944133060] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:52:34,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [343159517] [2022-11-23 14:52:34,290 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:52:34,291 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:52:34,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:52:34,296 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:52:34,300 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-23 14:52:34,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:52:34,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 23 conjunts are in the unsatisfiable core [2022-11-23 14:52:34,497 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:52:34,606 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:52:34,606 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:52:34,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [343159517] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:52:34,606 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 14:52:34,607 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 9 [2022-11-23 14:52:34,607 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [856290205] [2022-11-23 14:52:34,607 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:52:34,607 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-23 14:52:34,607 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:52:34,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-23 14:52:34,608 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2022-11-23 14:52:34,608 INFO L87 Difference]: Start difference. First operand 367 states and 485 transitions. Second operand has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:52:35,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:52:35,009 INFO L93 Difference]: Finished difference Result 374 states and 490 transitions. [2022-11-23 14:52:35,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-11-23 14:52:35,009 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 31 [2022-11-23 14:52:35,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:52:35,011 INFO L225 Difference]: With dead ends: 374 [2022-11-23 14:52:35,012 INFO L226 Difference]: Without dead ends: 374 [2022-11-23 14:52:35,012 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 28 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2022-11-23 14:52:35,013 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 189 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 237 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 132 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:52:35,013 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [192 Valid, 132 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 237 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-23 14:52:35,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2022-11-23 14:52:35,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 366. [2022-11-23 14:52:35,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 366 states, 267 states have (on average 1.3258426966292134) internal successors, (354), 301 states have internal predecessors, (354), 50 states have call successors, (50), 23 states have call predecessors, (50), 30 states have return successors, (72), 41 states have call predecessors, (72), 50 states have call successors, (72) [2022-11-23 14:52:35,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 476 transitions. [2022-11-23 14:52:35,025 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 476 transitions. Word has length 31 [2022-11-23 14:52:35,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:52:35,026 INFO L495 AbstractCegarLoop]: Abstraction has 366 states and 476 transitions. [2022-11-23 14:52:35,026 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 3.857142857142857) internal successors, (27), 8 states have internal predecessors, (27), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:52:35,026 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 476 transitions. [2022-11-23 14:52:35,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-11-23 14:52:35,027 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:52:35,027 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:52:35,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-23 14:52:35,233 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-11-23 14:52:35,233 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr27REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:52:35,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:52:35,234 INFO L85 PathProgramCache]: Analyzing trace with hash -412716430, now seen corresponding path program 1 times [2022-11-23 14:52:35,234 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:52:35,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445318055] [2022-11-23 14:52:35,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:52:35,234 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:52:35,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:52:35,660 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:52:35,660 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:52:35,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445318055] [2022-11-23 14:52:35,660 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [445318055] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:52:35,660 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1583826301] [2022-11-23 14:52:35,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:52:35,661 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:52:35,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:52:35,664 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:52:35,677 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-23 14:52:35,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:52:35,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 39 conjunts are in the unsatisfiable core [2022-11-23 14:52:35,896 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:52:36,290 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:52:36,290 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-11-23 14:52:36,290 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1583826301] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:52:36,290 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-11-23 14:52:36,290 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [9] total 16 [2022-11-23 14:52:36,291 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783724580] [2022-11-23 14:52:36,291 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:52:36,291 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-23 14:52:36,291 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:52:36,291 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-23 14:52:36,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2022-11-23 14:52:36,292 INFO L87 Difference]: Start difference. First operand 366 states and 476 transitions. Second operand has 11 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:52:37,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:52:37,151 INFO L93 Difference]: Finished difference Result 433 states and 569 transitions. [2022-11-23 14:52:37,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-11-23 14:52:37,152 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 31 [2022-11-23 14:52:37,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:52:37,155 INFO L225 Difference]: With dead ends: 433 [2022-11-23 14:52:37,155 INFO L226 Difference]: Without dead ends: 433 [2022-11-23 14:52:37,156 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=157, Invalid=599, Unknown=0, NotChecked=0, Total=756 [2022-11-23 14:52:37,156 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 346 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 397 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 346 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-23 14:52:37,156 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [346 Valid, 204 Invalid, 482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 397 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-23 14:52:37,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2022-11-23 14:52:37,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 371. [2022-11-23 14:52:37,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 371 states, 272 states have (on average 1.3161764705882353) internal successors, (358), 306 states have internal predecessors, (358), 50 states have call successors, (50), 23 states have call predecessors, (50), 30 states have return successors, (72), 41 states have call predecessors, (72), 50 states have call successors, (72) [2022-11-23 14:52:37,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 371 states to 371 states and 480 transitions. [2022-11-23 14:52:37,170 INFO L78 Accepts]: Start accepts. Automaton has 371 states and 480 transitions. Word has length 31 [2022-11-23 14:52:37,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:52:37,170 INFO L495 AbstractCegarLoop]: Abstraction has 371 states and 480 transitions. [2022-11-23 14:52:37,171 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 2.7) internal successors, (27), 9 states have internal predecessors, (27), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-23 14:52:37,171 INFO L276 IsEmpty]: Start isEmpty. Operand 371 states and 480 transitions. [2022-11-23 14:52:37,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-23 14:52:37,172 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:52:37,172 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:52:37,186 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-23 14:52:37,379 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-11-23 14:52:37,379 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr11REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:52:37,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:52:37,379 INFO L85 PathProgramCache]: Analyzing trace with hash -1898251068, now seen corresponding path program 2 times [2022-11-23 14:52:37,379 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:52:37,380 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576313225] [2022-11-23 14:52:37,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:52:37,380 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:52:37,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:52:38,643 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 2 proven. 18 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:52:38,644 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:52:38,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576313225] [2022-11-23 14:52:38,644 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [576313225] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:52:38,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [413071397] [2022-11-23 14:52:38,644 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:52:38,644 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:52:38,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:52:38,645 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:52:38,652 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-23 14:52:38,858 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-23 14:52:38,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:52:38,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 63 conjunts are in the unsatisfiable core [2022-11-23 14:52:38,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:52:39,057 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:52:39,062 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:52:39,785 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:52:39,785 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 48 treesize of output 42 [2022-11-23 14:52:39,810 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:52:39,810 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 54 treesize of output 36 [2022-11-23 14:52:40,004 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-23 14:52:40,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:52:41,156 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 34 treesize of output 28 [2022-11-23 14:52:41,172 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:52:41,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:52:41,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:52:41,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:52:41,262 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 6 [2022-11-23 14:52:41,408 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-23 14:52:41,409 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [413071397] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:52:41,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [841110150] [2022-11-23 14:52:41,411 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2022-11-23 14:52:41,411 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:52:41,411 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 14:52:41,412 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:52:41,412 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 33 [2022-11-23 14:52:41,412 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940000449] [2022-11-23 14:52:41,412 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:52:41,413 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-11-23 14:52:41,413 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:52:41,413 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-11-23 14:52:41,414 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1009, Unknown=0, NotChecked=0, Total=1122 [2022-11-23 14:52:41,414 INFO L87 Difference]: Start difference. First operand 371 states and 480 transitions. Second operand has 34 states, 31 states have (on average 2.193548387096774) internal successors, (68), 30 states have internal predecessors, (68), 6 states have call successors, (6), 2 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:52:45,306 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:52:50,475 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2022-11-23 14:52:55,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:52:55,627 INFO L93 Difference]: Finished difference Result 534 states and 662 transitions. [2022-11-23 14:52:55,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2022-11-23 14:52:55,627 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 31 states have (on average 2.193548387096774) internal successors, (68), 30 states have internal predecessors, (68), 6 states have call successors, (6), 2 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 35 [2022-11-23 14:52:55,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:52:55,631 INFO L225 Difference]: With dead ends: 534 [2022-11-23 14:52:55,631 INFO L226 Difference]: Without dead ends: 512 [2022-11-23 14:52:55,632 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1647 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=891, Invalid=5589, Unknown=0, NotChecked=0, Total=6480 [2022-11-23 14:52:55,633 INFO L413 NwaCegarLoop]: 87 mSDtfsCounter, 1364 mSDsluCounter, 987 mSDsCounter, 0 mSdLazyCounter, 2657 mSolverCounterSat, 441 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1364 SdHoareTripleChecker+Valid, 1074 SdHoareTripleChecker+Invalid, 3100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 441 IncrementalHoareTripleChecker+Valid, 2657 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.4s IncrementalHoareTripleChecker+Time [2022-11-23 14:52:55,633 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1364 Valid, 1074 Invalid, 3100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [441 Valid, 2657 Invalid, 2 Unknown, 0 Unchecked, 9.4s Time] [2022-11-23 14:52:55,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 512 states. [2022-11-23 14:52:55,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 512 to 331. [2022-11-23 14:52:55,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 245 states have (on average 1.3306122448979592) internal successors, (326), 274 states have internal predecessors, (326), 44 states have call successors, (44), 23 states have call predecessors, (44), 26 states have return successors, (62), 33 states have call predecessors, (62), 43 states have call successors, (62) [2022-11-23 14:52:55,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 432 transitions. [2022-11-23 14:52:55,647 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 432 transitions. Word has length 35 [2022-11-23 14:52:55,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:52:55,648 INFO L495 AbstractCegarLoop]: Abstraction has 331 states and 432 transitions. [2022-11-23 14:52:55,648 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 31 states have (on average 2.193548387096774) internal successors, (68), 30 states have internal predecessors, (68), 6 states have call successors, (6), 2 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:52:55,648 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 432 transitions. [2022-11-23 14:52:55,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-23 14:52:55,649 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:52:55,649 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:52:55,660 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-23 14:52:55,856 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-11-23 14:52:55,856 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting is_list_containing_xErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:52:55,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:52:55,857 INFO L85 PathProgramCache]: Analyzing trace with hash 1263222508, now seen corresponding path program 1 times [2022-11-23 14:52:55,857 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:52:55,857 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1440689752] [2022-11-23 14:52:55,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:52:55,857 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:52:55,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:52:56,046 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 14:52:56,046 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:52:56,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1440689752] [2022-11-23 14:52:56,046 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1440689752] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:52:56,046 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:52:56,047 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-23 14:52:56,047 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549285848] [2022-11-23 14:52:56,047 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:52:56,047 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 14:52:56,047 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:52:56,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 14:52:56,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:52:56,048 INFO L87 Difference]: Start difference. First operand 331 states and 432 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:52:56,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:52:56,321 INFO L93 Difference]: Finished difference Result 375 states and 487 transitions. [2022-11-23 14:52:56,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-23 14:52:56,321 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 34 [2022-11-23 14:52:56,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:52:56,323 INFO L225 Difference]: With dead ends: 375 [2022-11-23 14:52:56,323 INFO L226 Difference]: Without dead ends: 375 [2022-11-23 14:52:56,323 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2022-11-23 14:52:56,324 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 44 mSDsluCounter, 222 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-23 14:52:56,324 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 286 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-23 14:52:56,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 375 states. [2022-11-23 14:52:56,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 375 to 346. [2022-11-23 14:52:56,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 346 states, 258 states have (on average 1.3294573643410852) internal successors, (343), 284 states have internal predecessors, (343), 45 states have call successors, (45), 23 states have call predecessors, (45), 27 states have return successors, (66), 38 states have call predecessors, (66), 45 states have call successors, (66) [2022-11-23 14:52:56,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 346 states to 346 states and 454 transitions. [2022-11-23 14:52:56,337 INFO L78 Accepts]: Start accepts. Automaton has 346 states and 454 transitions. Word has length 34 [2022-11-23 14:52:56,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:52:56,337 INFO L495 AbstractCegarLoop]: Abstraction has 346 states and 454 transitions. [2022-11-23 14:52:56,337 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-23 14:52:56,338 INFO L276 IsEmpty]: Start isEmpty. Operand 346 states and 454 transitions. [2022-11-23 14:52:56,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-23 14:52:56,338 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:52:56,339 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, 1, 1, 1, 1, 1] [2022-11-23 14:52:56,339 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2022-11-23 14:52:56,339 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:52:56,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:52:56,340 INFO L85 PathProgramCache]: Analyzing trace with hash -1320147351, now seen corresponding path program 2 times [2022-11-23 14:52:56,340 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:52:56,340 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107596106] [2022-11-23 14:52:56,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:52:56,341 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:52:56,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:52:57,902 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:52:57,903 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:52:57,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107596106] [2022-11-23 14:52:57,903 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [107596106] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:52:57,903 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [887750754] [2022-11-23 14:52:57,903 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:52:57,903 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:52:57,903 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:52:57,904 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:52:57,908 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-23 14:52:58,115 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-23 14:52:58,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:52:58,118 INFO L263 TraceCheckSpWp]: Trace formula consists of 246 conjuncts, 81 conjunts are in the unsatisfiable core [2022-11-23 14:52:58,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:52:58,199 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:52:58,209 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:52:58,304 INFO L321 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2022-11-23 14:52:58,305 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 23 treesize of output 30 [2022-11-23 14:52:58,329 INFO L321 Elim1Store]: treesize reduction 45, result has 25.0 percent of original size [2022-11-23 14:52:58,329 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2022-11-23 14:53:00,569 INFO L321 Elim1Store]: treesize reduction 44, result has 71.2 percent of original size [2022-11-23 14:53:00,569 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 7 new quantified variables, introduced 10 case distinctions, treesize of input 121 treesize of output 189 [2022-11-23 14:53:02,011 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-23 14:53:02,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:53:02,066 INFO L321 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2022-11-23 14:53:02,066 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 [2022-11-23 14:53:43,193 WARN L233 SmtUtils]: Spent 18.17s on a formula simplification that was a NOOP. DAG size: 49 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:54:01,489 WARN L233 SmtUtils]: Spent 18.07s on a formula simplification that was a NOOP. DAG size: 57 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:54:02,200 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:54:02,201 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 5 new quantified variables, introduced 6 case distinctions, treesize of input 7881 treesize of output 6982 [2022-11-23 14:54:02,898 INFO L321 Elim1Store]: treesize reduction 175, result has 53.1 percent of original size [2022-11-23 14:54:02,899 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 10 new quantified variables, introduced 36 case distinctions, treesize of input 11101 treesize of output 10186 [2022-11-23 14:54:28,427 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-23 14:54:28,428 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [887750754] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:54:28,428 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1993612961] [2022-11-23 14:54:28,430 INFO L159 IcfgInterpreter]: Started Sifa with 25 locations of interest [2022-11-23 14:54:28,430 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:54:28,430 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 14:54:28,430 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:54:28,431 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14, 16] total 43 [2022-11-23 14:54:28,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258066281] [2022-11-23 14:54:28,431 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:54:28,431 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-11-23 14:54:28,431 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:54:28,432 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-11-23 14:54:28,432 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=1640, Unknown=7, NotChecked=0, Total=1806 [2022-11-23 14:54:28,432 INFO L87 Difference]: Start difference. First operand 346 states and 454 transitions. Second operand has 43 states, 40 states have (on average 1.925) internal successors, (77), 39 states have internal predecessors, (77), 6 states have call successors, (6), 2 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:54:33,555 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:54:43,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:54:43,149 INFO L93 Difference]: Finished difference Result 459 states and 599 transitions. [2022-11-23 14:54:43,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-11-23 14:54:43,149 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 40 states have (on average 1.925) internal successors, (77), 39 states have internal predecessors, (77), 6 states have call successors, (6), 2 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 34 [2022-11-23 14:54:43,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:54:43,152 INFO L225 Difference]: With dead ends: 459 [2022-11-23 14:54:43,152 INFO L226 Difference]: Without dead ends: 459 [2022-11-23 14:54:43,153 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1225 ImplicationChecksByTransitivity, 67.3s TimeCoverageRelationStatistics Valid=580, Invalid=4383, Unknown=7, NotChecked=0, Total=4970 [2022-11-23 14:54:43,154 INFO L413 NwaCegarLoop]: 77 mSDtfsCounter, 750 mSDsluCounter, 1418 mSDsCounter, 0 mSdLazyCounter, 2470 mSolverCounterSat, 290 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 756 SdHoareTripleChecker+Valid, 1495 SdHoareTripleChecker+Invalid, 2761 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 290 IncrementalHoareTripleChecker+Valid, 2470 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.8s IncrementalHoareTripleChecker+Time [2022-11-23 14:54:43,154 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [756 Valid, 1495 Invalid, 2761 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [290 Valid, 2470 Invalid, 1 Unknown, 0 Unchecked, 8.8s Time] [2022-11-23 14:54:43,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2022-11-23 14:54:43,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 391. [2022-11-23 14:54:43,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 292 states have (on average 1.3253424657534247) internal successors, (387), 320 states have internal predecessors, (387), 52 states have call successors, (52), 25 states have call predecessors, (52), 31 states have return successors, (82), 45 states have call predecessors, (82), 52 states have call successors, (82) [2022-11-23 14:54:43,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 521 transitions. [2022-11-23 14:54:43,167 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 521 transitions. Word has length 34 [2022-11-23 14:54:43,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:54:43,167 INFO L495 AbstractCegarLoop]: Abstraction has 391 states and 521 transitions. [2022-11-23 14:54:43,167 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 40 states have (on average 1.925) internal successors, (77), 39 states have internal predecessors, (77), 6 states have call successors, (6), 2 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:54:43,167 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 521 transitions. [2022-11-23 14:54:43,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-23 14:54:43,168 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:54:43,168 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:54:43,180 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-23 14:54:43,375 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-11-23 14:54:43,375 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr30REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:54:43,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:54:43,376 INFO L85 PathProgramCache]: Analyzing trace with hash 1256247037, now seen corresponding path program 1 times [2022-11-23 14:54:43,376 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:54:43,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429895450] [2022-11-23 14:54:43,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:54:43,376 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:54:43,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:54:45,370 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:54:45,370 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:54:45,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429895450] [2022-11-23 14:54:45,370 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [429895450] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:54:45,370 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [326980933] [2022-11-23 14:54:45,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:54:45,371 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:54:45,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:54:45,372 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:54:45,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-23 14:54:45,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:54:45,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 63 conjunts are in the unsatisfiable core [2022-11-23 14:54:45,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:54:45,607 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 [2022-11-23 14:54:45,716 INFO L321 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2022-11-23 14:54:45,716 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 [2022-11-23 14:54:45,796 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 [2022-11-23 14:54:47,853 WARN L859 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_main_~#list~0#1.offset_BEFORE_CALL_51| Int) (|v_ULTIMATE.start_main_~#list~0#1.base_BEFORE_CALL_53| Int)) (not (= |v_ULTIMATE.start_main_~#list~0#1.base_BEFORE_CALL_53| (select (select |c_#memory_$Pointer$.base| |v_ULTIMATE.start_main_~#list~0#1.base_BEFORE_CALL_53|) (+ |v_ULTIMATE.start_main_~#list~0#1.offset_BEFORE_CALL_51| 4))))) is different from true [2022-11-23 14:54:56,399 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-23 14:54:56,399 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 34 treesize of output 35 [2022-11-23 14:54:57,005 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 31 treesize of output 13 [2022-11-23 14:54:57,010 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:54:57,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:54:57,282 INFO L321 Elim1Store]: treesize reduction 5, result has 70.6 percent of original size [2022-11-23 14:54:57,283 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 21 treesize of output 20 [2022-11-23 14:54:57,740 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 32 treesize of output 26 [2022-11-23 14:54:57,918 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:54:57,918 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [326980933] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:54:57,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [290341821] [2022-11-23 14:54:57,920 INFO L159 IcfgInterpreter]: Started Sifa with 34 locations of interest [2022-11-23 14:54:57,920 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:54:57,921 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:54:57,921 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:54:57,921 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:54:57,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:57,947 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:57,948 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 [2022-11-23 14:54:57,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:57,963 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 30 treesize of output 21 [2022-11-23 14:54:57,970 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 [2022-11-23 14:54:57,976 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 [2022-11-23 14:54:57,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:57,996 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 21 treesize of output 20 [2022-11-23 14:54:58,007 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,008 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 [2022-11-23 14:54:58,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,019 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 21 treesize of output 20 [2022-11-23 14:54:58,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,045 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,048 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 29 treesize of output 35 [2022-11-23 14:54:58,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,076 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:54:58,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,092 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 30 treesize of output 21 [2022-11-23 14:54:58,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,106 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:54:58,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,128 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 [2022-11-23 14:54:58,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,147 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:54:58,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,161 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,163 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:54:58,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,197 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,199 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:54:58,200 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:54:58,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,220 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 [2022-11-23 14:54:58,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,238 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:54:58,239 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:54:58,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,295 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 59 treesize of output 60 [2022-11-23 14:54:58,323 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 [2022-11-23 14:54:58,329 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 15 treesize of output 1 [2022-11-23 14:54:58,335 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 [2022-11-23 14:54:58,345 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 19 treesize of output 1 [2022-11-23 14:54:58,352 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,352 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 21 treesize of output 20 [2022-11-23 14:54:58,359 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,361 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 21 treesize of output 20 [2022-11-23 14:54:58,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,397 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:54:58,413 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:54:58,414 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 36 [2022-11-23 14:54:58,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,428 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,429 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:54:58,441 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:54:58,442 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 32 [2022-11-23 14:54:58,451 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:54:58,510 INFO L321 Elim1Store]: treesize reduction 68, result has 31.3 percent of original size [2022-11-23 14:54:58,510 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 28 treesize of output 45 [2022-11-23 14:54:58,525 INFO L321 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2022-11-23 14:54:58,526 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 1 case distinctions, treesize of input 33 treesize of output 38 [2022-11-23 14:54:58,543 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 [2022-11-23 14:54:58,548 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 [2022-11-23 14:54:58,555 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 15 treesize of output 1 [2022-11-23 14:54:58,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,566 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 21 treesize of output 20 [2022-11-23 14:54:58,581 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 19 treesize of output 1 [2022-11-23 14:54:58,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,589 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 21 treesize of output 20 [2022-11-23 14:54:58,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,612 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:54:58,633 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:54:58,633 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 36 [2022-11-23 14:54:58,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,655 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,655 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:54:58,670 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:54:58,671 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 32 [2022-11-23 14:54:58,681 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:54:58,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,899 INFO L321 Elim1Store]: treesize reduction 62, result has 34.7 percent of original size [2022-11-23 14:54:58,899 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 3 new quantified variables, introduced 2 case distinctions, treesize of input 163 treesize of output 130 [2022-11-23 14:54:58,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:54:58,983 INFO L321 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2022-11-23 14:54:58,983 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 3 new quantified variables, introduced 2 case distinctions, treesize of input 128 treesize of output 101 [2022-11-23 14:54:59,000 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:54:59,394 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 64 for LOIs [2022-11-23 14:54:59,529 INFO L197 IcfgInterpreter]: Interpreting procedure is_list_containing_x with input of size 12 for LOIs [2022-11-23 14:54:59,536 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:55:16,079 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26145#(and (= (select |#valid| |ULTIMATE.start_re_insert_~x#1.base|) 1) (<= 0 |ULTIMATE.start_main_~tail~0#1.base|) (= |ULTIMATE.start_main_~#list~0#1.offset| 0) (<= 0 |ULTIMATE.start_remove_#in~x#1.offset|) (= |ULTIMATE.start_re_insert_#in~x#1.offset| |ULTIMATE.start_main_~x~0#1.offset|) (<= 0 |ULTIMATE.start_main_~tail~0#1.offset|) (<= 0 |ULTIMATE.start_main_~x~0#1.offset|) (<= |ULTIMATE.start_main_~x~0#1.offset| 0) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_re_insert_~x#1.base|) (+ |ULTIMATE.start_re_insert_~x#1.offset| 4)) |ULTIMATE.start_re_insert_#t~mem10#1.offset|) (or (not (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_re_insert_~x#1.base|) (+ |ULTIMATE.start_re_insert_~x#1.offset| 4)) 0)) (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_re_insert_~x#1.base|) (+ |ULTIMATE.start_re_insert_~x#1.offset| 4)) 0))) (<= 0 |ULTIMATE.start_main_~x~0#1.base|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 256) (= |ULTIMATE.start_re_insert_~x#1.base| |ULTIMATE.start_re_insert_#in~x#1.base|) (<= 0 |ULTIMATE.start_main_~#list~0#1.base|) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_remove_~x#1.offset|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_remove_~x#1.base|) (<= |ULTIMATE.start_remove_#in~x#1.offset| 0) (= |ULTIMATE.start_re_insert_#t~mem10#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_re_insert_~x#1.base|) (+ |ULTIMATE.start_re_insert_~x#1.offset| 4))) (<= (+ |ULTIMATE.start_re_insert_~x#1.offset| 8) (select |#length| |ULTIMATE.start_re_insert_~x#1.base|)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_remove_#in~x#1.base|) (not (= (select |#valid| |ULTIMATE.start_re_insert_#t~mem10#1.base|) 1)) (= |ULTIMATE.start_re_insert_~x#1.offset| |ULTIMATE.start_re_insert_#in~x#1.offset|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 256) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_re_insert_#in~x#1.base| |ULTIMATE.start_main_~x~0#1.base|) (<= |ULTIMATE.start_remove_~x#1.offset| 0) (= |#NULL.base| 0) (<= |ULTIMATE.start_main_~tail~0#1.offset| 0))' at error location [2022-11-23 14:55:16,080 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:55:16,080 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:55:16,080 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 16, 13] total 41 [2022-11-23 14:55:16,080 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395313070] [2022-11-23 14:55:16,080 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:55:16,081 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-11-23 14:55:16,081 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:55:16,081 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-11-23 14:55:16,082 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=311, Invalid=4377, Unknown=8, NotChecked=134, Total=4830 [2022-11-23 14:55:16,082 INFO L87 Difference]: Start difference. First operand 391 states and 521 transitions. Second operand has 42 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 38 states have internal predecessors, (79), 5 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-23 14:55:18,450 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:55:20,622 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:55:22,675 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:55:24,688 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:55:34,929 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:55:36,932 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:55:43,566 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:55:50,984 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:02,933 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:05,786 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:07,872 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:09,928 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:11,959 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:13,972 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:15,978 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:19,063 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:21,068 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:23,387 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:25,409 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:27,450 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:29,506 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:31,586 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:33,738 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:36,069 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:36,430 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse4 (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~x~0#1.base|)) (.cse6 (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_main_~x~0#1.base|)) (.cse1 (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~#list~0#1.base|)) (.cse5 (+ |c_ULTIMATE.start_main_~#list~0#1.offset| 4)) (.cse0 (= |c_ULTIMATE.start_main_~#list~0#1.base| |c_ULTIMATE.start_main_~x~0#1.base|)) (.cse2 (+ |c_ULTIMATE.start_main_~x~0#1.offset| 4)) (.cse3 (= |c_ULTIMATE.start_main_~x~0#1.offset| |c_ULTIMATE.start_main_~#list~0#1.offset|))) (and .cse0 (= (select |c_#valid| (select .cse1 .cse2)) 1) .cse3 (= (select |c_#valid| (select .cse4 .cse5)) 1) (= (select .cse6 .cse5) 0) (= (select |c_#valid| |c_ULTIMATE.start_main_~#list~0#1.base|) 1) (= (select |c_#valid| (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_re_insert_~x#1.base|) (+ |c_ULTIMATE.start_re_insert_~x#1.offset| 4))) 1) (not (= |c_ULTIMATE.start_main_~#list~0#1.base| |c_ULTIMATE.start_main_~n~0#1.base|)) (= (select (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_main_~#list~0#1.base|) |c_ULTIMATE.start_main_~#list~0#1.offset|) 0) (= (select .cse4 |c_ULTIMATE.start_main_~#list~0#1.offset|) 0) (= (select .cse6 |c_ULTIMATE.start_main_~#list~0#1.offset|) 0) (= (select .cse1 |c_ULTIMATE.start_main_~#list~0#1.offset|) 0) (= |c_ULTIMATE.start_main_~tail~0#1.base| |c_ULTIMATE.start_main_~#list~0#1.base|) (= |c_ULTIMATE.start_main_~tail~0#1.offset| |c_ULTIMATE.start_main_~#list~0#1.offset|) (= |c_ULTIMATE.start_main_~n~0#1.offset| 0) (not (= (select .cse1 .cse5) |c_ULTIMATE.start_main_~#list~0#1.base|)) (= (select |c_#valid| |c_ULTIMATE.start_main_~n~0#1.base|) 1) (or (not .cse0) (forall ((v_ArrVal_2111 (Array Int Int))) (let ((.cse7 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_remove_~x#1.base|) (+ |c_ULTIMATE.start_remove_~x#1.offset| 4)))) (= (select (select (store |c_#memory_$Pointer$.base| .cse7 v_ArrVal_2111) |c_ULTIMATE.start_main_~x~0#1.base|) .cse2) .cse7))) (not .cse3)))) is different from false [2022-11-23 14:56:38,840 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:41,163 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:56:41,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:56:41,427 INFO L93 Difference]: Finished difference Result 576 states and 756 transitions. [2022-11-23 14:56:41,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-23 14:56:41,428 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 38 states have internal predecessors, (79), 5 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) Word has length 34 [2022-11-23 14:56:41,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:56:41,431 INFO L225 Difference]: With dead ends: 576 [2022-11-23 14:56:41,431 INFO L226 Difference]: Without dead ends: 576 [2022-11-23 14:56:41,433 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 48 SyntacticMatches, 8 SemanticMatches, 107 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 3721 ImplicationChecksByTransitivity, 58.4s TimeCoverageRelationStatistics Valid=1197, Invalid=10138, Unknown=15, NotChecked=422, Total=11772 [2022-11-23 14:56:41,434 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 1017 mSDsluCounter, 972 mSDsCounter, 0 mSdLazyCounter, 2158 mSolverCounterSat, 397 mSolverCounterUnsat, 43 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 55.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1019 SdHoareTripleChecker+Valid, 1032 SdHoareTripleChecker+Invalid, 2805 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 397 IncrementalHoareTripleChecker+Valid, 2158 IncrementalHoareTripleChecker+Invalid, 43 IncrementalHoareTripleChecker+Unknown, 207 IncrementalHoareTripleChecker+Unchecked, 55.8s IncrementalHoareTripleChecker+Time [2022-11-23 14:56:41,434 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1019 Valid, 1032 Invalid, 2805 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [397 Valid, 2158 Invalid, 43 Unknown, 207 Unchecked, 55.8s Time] [2022-11-23 14:56:41,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 576 states. [2022-11-23 14:56:41,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 576 to 431. [2022-11-23 14:56:41,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 431 states, 325 states have (on average 1.3323076923076924) internal successors, (433), 355 states have internal predecessors, (433), 53 states have call successors, (53), 28 states have call predecessors, (53), 37 states have return successors, (85), 47 states have call predecessors, (85), 53 states have call successors, (85) [2022-11-23 14:56:41,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 571 transitions. [2022-11-23 14:56:41,466 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 571 transitions. Word has length 34 [2022-11-23 14:56:41,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:56:41,467 INFO L495 AbstractCegarLoop]: Abstraction has 431 states and 571 transitions. [2022-11-23 14:56:41,467 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 41 states have (on average 1.9268292682926829) internal successors, (79), 38 states have internal predecessors, (79), 5 states have call successors, (6), 3 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 5 states have call successors, (6) [2022-11-23 14:56:41,467 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 571 transitions. [2022-11-23 14:56:41,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-11-23 14:56:41,468 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:56:41,468 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:56:41,475 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-23 14:56:41,674 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2022-11-23 14:56:41,675 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr31REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:56:41,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:56:41,676 INFO L85 PathProgramCache]: Analyzing trace with hash 1256247038, now seen corresponding path program 1 times [2022-11-23 14:56:41,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:56:41,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [631250619] [2022-11-23 14:56:41,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:56:41,678 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:56:41,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:56:43,661 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:56:43,661 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:56:43,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [631250619] [2022-11-23 14:56:43,661 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [631250619] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:56:43,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1812939467] [2022-11-23 14:56:43,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:56:43,662 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:56:43,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:56:43,664 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:56:43,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-23 14:56:43,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:56:43,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 69 conjunts are in the unsatisfiable core [2022-11-23 14:56:43,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:56:44,257 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2022-11-23 14:56:44,264 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:56:45,079 INFO L321 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2022-11-23 14:56:45,079 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 42 [2022-11-23 14:56:45,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:45,091 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 22 [2022-11-23 14:56:45,383 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 26 treesize of output 14 [2022-11-23 14:56:45,387 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 [2022-11-23 14:56:45,443 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-23 14:56:45,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:56:45,704 WARN L837 $PredicateComparison]: unable to prove that (let ((.cse0 (+ |c_ULTIMATE.start_main_~x~0#1.offset| 4))) (and (forall ((v_ArrVal_2196 (Array Int Int))) (<= 0 (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_remove_#t~mem4#1.base| v_ArrVal_2196) |c_ULTIMATE.start_main_~x~0#1.base|) .cse0))) (forall ((v_ArrVal_2197 (Array Int Int)) (v_ArrVal_2196 (Array Int Int))) (<= (+ (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_remove_#t~mem4#1.base| v_ArrVal_2196) |c_ULTIMATE.start_main_~x~0#1.base|) .cse0) 4) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_remove_#t~mem4#1.base| v_ArrVal_2197) |c_ULTIMATE.start_main_~x~0#1.base|) .cse0)))))) is different from false [2022-11-23 14:56:46,495 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1812939467] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:56:46,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1950444614] [2022-11-23 14:56:46,497 INFO L159 IcfgInterpreter]: Started Sifa with 34 locations of interest [2022-11-23 14:56:46,497 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:56:46,498 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-23 14:56:46,498 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-23 14:56:46,498 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-23 14:56:46,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,519 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 [2022-11-23 14:56:46,555 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,556 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 30 treesize of output 21 [2022-11-23 14:56:46,565 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 [2022-11-23 14:56:46,573 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 [2022-11-23 14:56:46,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,592 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 21 treesize of output 20 [2022-11-23 14:56:46,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,601 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 21 treesize of output 20 [2022-11-23 14:56:46,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,615 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 [2022-11-23 14:56:46,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,646 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,649 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,654 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 29 treesize of output 35 [2022-11-23 14:56:46,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,682 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:56:46,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,699 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,700 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 28 treesize of output 30 [2022-11-23 14:56:46,716 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,716 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 30 treesize of output 21 [2022-11-23 14:56:46,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,737 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 [2022-11-23 14:56:46,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,754 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:56:46,768 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,772 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,774 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 42 [2022-11-23 14:56:46,807 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,809 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,813 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:56:46,814 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:56:46,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,830 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 [2022-11-23 14:56:46,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,869 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:56:46,870 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2022-11-23 14:56:46,907 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,910 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,917 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,924 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,928 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 13 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 66 treesize of output 65 [2022-11-23 14:56:46,965 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 15 treesize of output 1 [2022-11-23 14:56:46,971 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 [2022-11-23 14:56:46,977 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 [2022-11-23 14:56:46,988 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 19 treesize of output 1 [2022-11-23 14:56:46,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:46,996 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 21 treesize of output 20 [2022-11-23 14:56:47,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:47,005 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 21 treesize of output 20 [2022-11-23 14:56:47,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:47,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:47,027 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:56:47,047 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:56:47,047 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 36 [2022-11-23 14:56:47,056 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:56:47,067 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:47,070 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:47,071 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:56:47,085 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:56:47,088 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 32 [2022-11-23 14:56:47,154 INFO L321 Elim1Store]: treesize reduction 68, result has 31.3 percent of original size [2022-11-23 14:56:47,154 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 28 treesize of output 45 [2022-11-23 14:56:47,176 INFO L321 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2022-11-23 14:56:47,176 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 1 case distinctions, treesize of input 25 treesize of output 30 [2022-11-23 14:56:47,194 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 [2022-11-23 14:56:47,203 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 15 treesize of output 1 [2022-11-23 14:56:47,211 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 [2022-11-23 14:56:47,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:47,226 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 21 treesize of output 20 [2022-11-23 14:56:47,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:47,237 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 21 treesize of output 20 [2022-11-23 14:56:47,246 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 19 treesize of output 1 [2022-11-23 14:56:47,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:47,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:47,273 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:56:47,290 INFO L321 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2022-11-23 14:56:47,291 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 32 [2022-11-23 14:56:47,301 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2022-11-23 14:56:47,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:47,317 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:47,318 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:56:47,341 INFO L321 Elim1Store]: treesize reduction 15, result has 46.4 percent of original size [2022-11-23 14:56:47,341 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 36 [2022-11-23 14:56:47,494 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:47,560 INFO L321 Elim1Store]: treesize reduction 62, result has 34.7 percent of original size [2022-11-23 14:56:47,560 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 3 new quantified variables, introduced 2 case distinctions, treesize of input 163 treesize of output 130 [2022-11-23 14:56:47,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2022-11-23 14:56:47,622 INFO L321 Elim1Store]: treesize reduction 44, result has 38.0 percent of original size [2022-11-23 14:56:47,623 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 3 new quantified variables, introduced 2 case distinctions, treesize of input 128 treesize of output 101 [2022-11-23 14:56:47,638 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:56:47,988 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 64 for LOIs [2022-11-23 14:56:48,073 INFO L197 IcfgInterpreter]: Interpreting procedure is_list_containing_x with input of size 12 for LOIs [2022-11-23 14:56:48,079 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-23 14:56:57,221 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27468#(and (= (select |#valid| |ULTIMATE.start_re_insert_~x#1.base|) 1) (<= 0 |ULTIMATE.start_main_~tail~0#1.base|) (= |ULTIMATE.start_main_~#list~0#1.offset| 0) (or (not (<= (+ |ULTIMATE.start_re_insert_#t~mem10#1.offset| 4) (select |#length| |ULTIMATE.start_re_insert_#t~mem10#1.base|))) (not (<= 0 |ULTIMATE.start_re_insert_#t~mem10#1.offset|))) (<= 0 |ULTIMATE.start_remove_#in~x#1.offset|) (= |ULTIMATE.start_re_insert_#in~x#1.offset| |ULTIMATE.start_main_~x~0#1.offset|) (<= 0 |ULTIMATE.start_main_~tail~0#1.offset|) (<= 0 |ULTIMATE.start_main_~x~0#1.offset|) (<= |ULTIMATE.start_main_~x~0#1.offset| 0) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_re_insert_~x#1.base|) (+ |ULTIMATE.start_re_insert_~x#1.offset| 4)) |ULTIMATE.start_re_insert_#t~mem10#1.offset|) (or (not (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_re_insert_~x#1.base|) (+ |ULTIMATE.start_re_insert_~x#1.offset| 4)) 0)) (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_re_insert_~x#1.base|) (+ |ULTIMATE.start_re_insert_~x#1.offset| 4)) 0))) (<= 0 |ULTIMATE.start_main_~x~0#1.base|) (<= |ULTIMATE.start_assume_abort_if_not_#in~cond#1| 256) (= |ULTIMATE.start_re_insert_~x#1.base| |ULTIMATE.start_re_insert_#in~x#1.base|) (<= 0 |ULTIMATE.start_main_~#list~0#1.base|) (<= 0 |ULTIMATE.start_assume_abort_if_not_#in~cond#1|) (<= 0 |ULTIMATE.start_remove_~x#1.offset|) (<= 0 |ULTIMATE.start_assume_abort_if_not_~cond#1|) (<= 0 |ULTIMATE.start_remove_~x#1.base|) (<= |ULTIMATE.start_remove_#in~x#1.offset| 0) (= |ULTIMATE.start_re_insert_#t~mem10#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_re_insert_~x#1.base|) (+ |ULTIMATE.start_re_insert_~x#1.offset| 4))) (<= (+ |ULTIMATE.start_re_insert_~x#1.offset| 8) (select |#length| |ULTIMATE.start_re_insert_~x#1.base|)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_remove_#in~x#1.base|) (= |ULTIMATE.start_re_insert_~x#1.offset| |ULTIMATE.start_re_insert_#in~x#1.offset|) (<= |ULTIMATE.start_assume_abort_if_not_~cond#1| 256) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_re_insert_#in~x#1.base| |ULTIMATE.start_main_~x~0#1.base|) (<= |ULTIMATE.start_remove_~x#1.offset| 0) (= |#NULL.base| 0) (<= |ULTIMATE.start_main_~tail~0#1.offset| 0))' at error location [2022-11-23 14:56:57,221 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-11-23 14:56:57,221 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-23 14:56:57,221 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 14] total 35 [2022-11-23 14:56:57,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105958542] [2022-11-23 14:56:57,221 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-23 14:56:57,222 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-23 14:56:57,222 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:56:57,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-23 14:56:57,223 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=316, Invalid=4656, Unknown=2, NotChecked=138, Total=5112 [2022-11-23 14:56:57,223 INFO L87 Difference]: Start difference. First operand 431 states and 571 transitions. Second operand has 36 states, 35 states have (on average 1.7142857142857142) internal successors, (60), 35 states have internal predecessors, (60), 4 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-23 14:57:05,172 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:57:05,173 INFO L93 Difference]: Finished difference Result 498 states and 641 transitions. [2022-11-23 14:57:05,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-23 14:57:05,173 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 35 states have (on average 1.7142857142857142) internal successors, (60), 35 states have internal predecessors, (60), 4 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) Word has length 34 [2022-11-23 14:57:05,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:57:05,176 INFO L225 Difference]: With dead ends: 498 [2022-11-23 14:57:05,176 INFO L226 Difference]: Without dead ends: 498 [2022-11-23 14:57:05,177 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 37 SyntacticMatches, 4 SemanticMatches, 94 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 2750 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=862, Invalid=8070, Unknown=2, NotChecked=186, Total=9120 [2022-11-23 14:57:05,178 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 999 mSDsluCounter, 797 mSDsCounter, 0 mSdLazyCounter, 2194 mSolverCounterSat, 268 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1003 SdHoareTripleChecker+Valid, 855 SdHoareTripleChecker+Invalid, 2462 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 268 IncrementalHoareTripleChecker+Valid, 2194 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-11-23 14:57:05,178 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1003 Valid, 855 Invalid, 2462 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [268 Valid, 2194 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2022-11-23 14:57:05,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 498 states. [2022-11-23 14:57:05,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 498 to 435. [2022-11-23 14:57:05,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 435 states, 329 states have (on average 1.337386018237082) internal successors, (440), 359 states have internal predecessors, (440), 53 states have call successors, (53), 28 states have call predecessors, (53), 37 states have return successors, (85), 47 states have call predecessors, (85), 53 states have call successors, (85) [2022-11-23 14:57:05,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 578 transitions. [2022-11-23 14:57:05,191 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 578 transitions. Word has length 34 [2022-11-23 14:57:05,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:57:05,192 INFO L495 AbstractCegarLoop]: Abstraction has 435 states and 578 transitions. [2022-11-23 14:57:05,192 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 35 states have (on average 1.7142857142857142) internal successors, (60), 35 states have internal predecessors, (60), 4 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-23 14:57:05,192 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 578 transitions. [2022-11-23 14:57:05,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-23 14:57:05,193 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:57:05,193 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:57:05,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-23 14:57:05,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:05,400 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:57:05,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:57:05,400 INFO L85 PathProgramCache]: Analyzing trace with hash 984711155, now seen corresponding path program 1 times [2022-11-23 14:57:05,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:57:05,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342222900] [2022-11-23 14:57:05,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:05,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:57:05,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:05,508 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-11-23 14:57:05,508 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:57:05,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1342222900] [2022-11-23 14:57:05,508 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1342222900] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:57:05,508 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:57:05,508 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2022-11-23 14:57:05,508 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671477700] [2022-11-23 14:57:05,509 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:57:05,509 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-23 14:57:05,509 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:57:05,509 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-23 14:57:05,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2022-11-23 14:57:05,510 INFO L87 Difference]: Start difference. First operand 435 states and 578 transitions. Second operand has 6 states, 5 states have (on average 5.6) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 14:57:05,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:57:05,656 INFO L93 Difference]: Finished difference Result 458 states and 601 transitions. [2022-11-23 14:57:05,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2022-11-23 14:57:05,657 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 5.6) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 36 [2022-11-23 14:57:05,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:57:05,659 INFO L225 Difference]: With dead ends: 458 [2022-11-23 14:57:05,659 INFO L226 Difference]: Without dead ends: 458 [2022-11-23 14:57:05,660 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2022-11-23 14:57:05,660 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 5 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:57:05,660 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 341 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:57:05,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 458 states. [2022-11-23 14:57:05,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 458 to 440. [2022-11-23 14:57:05,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 440 states, 332 states have (on average 1.3343373493975903) internal successors, (443), 362 states have internal predecessors, (443), 54 states have call successors, (54), 29 states have call predecessors, (54), 38 states have return successors, (86), 48 states have call predecessors, (86), 54 states have call successors, (86) [2022-11-23 14:57:05,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 583 transitions. [2022-11-23 14:57:05,673 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 583 transitions. Word has length 36 [2022-11-23 14:57:05,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:57:05,674 INFO L495 AbstractCegarLoop]: Abstraction has 440 states and 583 transitions. [2022-11-23 14:57:05,674 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 5.6) internal successors, (28), 4 states have internal predecessors, (28), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-23 14:57:05,674 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 583 transitions. [2022-11-23 14:57:05,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-23 14:57:05,675 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:57:05,675 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:57:05,675 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2022-11-23 14:57:05,676 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr16REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:57:05,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:57:05,676 INFO L85 PathProgramCache]: Analyzing trace with hash -367071043, now seen corresponding path program 1 times [2022-11-23 14:57:05,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:57:05,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [908742953] [2022-11-23 14:57:05,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:05,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:57:05,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:05,809 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-23 14:57:05,810 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:57:05,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [908742953] [2022-11-23 14:57:05,810 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [908742953] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-23 14:57:05,810 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-23 14:57:05,810 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-23 14:57:05,810 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [997003852] [2022-11-23 14:57:05,810 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-23 14:57:05,811 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-23 14:57:05,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:57:05,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-23 14:57:05,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:57:05,811 INFO L87 Difference]: Start difference. First operand 440 states and 583 transitions. Second operand has 5 states, 5 states have (on average 4.6) internal successors, (23), 3 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:57:05,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:57:05,870 INFO L93 Difference]: Finished difference Result 409 states and 523 transitions. [2022-11-23 14:57:05,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-23 14:57:05,874 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 3 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 36 [2022-11-23 14:57:05,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:57:05,876 INFO L225 Difference]: With dead ends: 409 [2022-11-23 14:57:05,877 INFO L226 Difference]: Without dead ends: 403 [2022-11-23 14:57:05,877 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-23 14:57:05,877 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 0 mSDsluCounter, 211 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 285 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-23 14:57:05,878 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 285 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-23 14:57:05,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2022-11-23 14:57:05,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 345. [2022-11-23 14:57:05,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 260 states have (on average 1.3) internal successors, (338), 284 states have internal predecessors, (338), 40 states have call successors, (40), 26 states have call predecessors, (40), 31 states have return successors, (53), 34 states have call predecessors, (53), 40 states have call successors, (53) [2022-11-23 14:57:05,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 431 transitions. [2022-11-23 14:57:05,888 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 431 transitions. Word has length 36 [2022-11-23 14:57:05,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:57:05,889 INFO L495 AbstractCegarLoop]: Abstraction has 345 states and 431 transitions. [2022-11-23 14:57:05,889 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 4.6) internal successors, (23), 3 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2022-11-23 14:57:05,889 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 431 transitions. [2022-11-23 14:57:05,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-23 14:57:05,890 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:57:05,890 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, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:57:05,890 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2022-11-23 14:57:05,890 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr24REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:57:05,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:57:05,891 INFO L85 PathProgramCache]: Analyzing trace with hash -1290235477, now seen corresponding path program 2 times [2022-11-23 14:57:05,891 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:57:05,891 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [907520855] [2022-11-23 14:57:05,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:57:05,892 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:57:05,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:57:06,731 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:57:06,732 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:57:06,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [907520855] [2022-11-23 14:57:06,732 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [907520855] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:57:06,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [214415710] [2022-11-23 14:57:06,732 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:57:06,732 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:57:06,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:57:06,733 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:57:06,736 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-23 14:57:06,950 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-23 14:57:06,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:57:06,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 75 conjunts are in the unsatisfiable core [2022-11-23 14:57:06,955 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:57:07,013 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2022-11-23 14:57:07,047 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2022-11-23 14:57:07,074 INFO L321 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2022-11-23 14:57:07,074 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 59 treesize of output 41 [2022-11-23 14:57:07,083 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 19 [2022-11-23 14:57:07,759 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:57:07,759 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 58 treesize of output 42 [2022-11-23 14:57:08,423 INFO L321 Elim1Store]: treesize reduction 66, result has 9.6 percent of original size [2022-11-23 14:57:08,423 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 73 treesize of output 32 [2022-11-23 14:57:08,454 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-23 14:57:08,454 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:57:23,547 WARN L233 SmtUtils]: Spent 9.98s on a formula simplification that was a NOOP. DAG size: 41 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:57:31,714 WARN L233 SmtUtils]: Spent 8.04s on a formula simplification that was a NOOP. DAG size: 49 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:57:31,923 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 94 treesize of output 88 [2022-11-23 14:57:32,014 INFO L321 Elim1Store]: treesize reduction 24, result has 91.3 percent of original size [2022-11-23 14:57:32,015 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 116 treesize of output 284 [2022-11-23 14:57:48,539 WARN L233 SmtUtils]: Spent 14.12s on a formula simplification. DAG size of input: 47 DAG size of output: 32 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:57:55,085 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:57:55,086 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 11115 treesize of output 10555 [2022-11-23 14:59:13,505 INFO L173 IndexEqualityManager]: detected equality via solver [2022-11-23 14:59:13,516 WARN L207 Elim1Store]: Array PQE input equivalent to true [2022-11-23 14:59:13,548 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 5 refuted. 2 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-23 14:59:13,548 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [214415710] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-23 14:59:13,548 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [446209231] [2022-11-23 14:59:13,550 INFO L159 IcfgInterpreter]: Started Sifa with 27 locations of interest [2022-11-23 14:59:13,550 INFO L166 IcfgInterpreter]: Building call graph [2022-11-23 14:59:13,550 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-23 14:59:13,551 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-23 14:59:13,551 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12, 13] total 35 [2022-11-23 14:59:13,552 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157671911] [2022-11-23 14:59:13,552 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-23 14:59:13,552 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-11-23 14:59:13,552 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-23 14:59:13,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-11-23 14:59:13,553 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1140, Unknown=5, NotChecked=0, Total=1260 [2022-11-23 14:59:13,553 INFO L87 Difference]: Start difference. First operand 345 states and 431 transitions. Second operand has 36 states, 33 states have (on average 2.3636363636363638) internal successors, (78), 32 states have internal predecessors, (78), 6 states have call successors, (6), 2 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:59:23,146 WARN L233 SmtUtils]: Spent 8.09s on a formula simplification that was a NOOP. DAG size: 50 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 14:59:30,483 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2022-11-23 14:59:35,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-23 14:59:35,487 INFO L93 Difference]: Finished difference Result 508 states and 627 transitions. [2022-11-23 14:59:35,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-11-23 14:59:35,488 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 33 states have (on average 2.3636363636363638) internal successors, (78), 32 states have internal predecessors, (78), 6 states have call successors, (6), 2 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Word has length 36 [2022-11-23 14:59:35,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-23 14:59:35,491 INFO L225 Difference]: With dead ends: 508 [2022-11-23 14:59:35,491 INFO L226 Difference]: Without dead ends: 508 [2022-11-23 14:59:35,492 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 56 SyntacticMatches, 1 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1531 ImplicationChecksByTransitivity, 59.1s TimeCoverageRelationStatistics Valid=850, Invalid=5151, Unknown=5, NotChecked=0, Total=6006 [2022-11-23 14:59:35,493 INFO L413 NwaCegarLoop]: 77 mSDtfsCounter, 1283 mSDsluCounter, 1074 mSDsCounter, 0 mSdLazyCounter, 2530 mSolverCounterSat, 485 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1283 SdHoareTripleChecker+Valid, 1151 SdHoareTripleChecker+Invalid, 3016 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 485 IncrementalHoareTripleChecker+Valid, 2530 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.3s IncrementalHoareTripleChecker+Time [2022-11-23 14:59:35,493 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1283 Valid, 1151 Invalid, 3016 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [485 Valid, 2530 Invalid, 1 Unknown, 0 Unchecked, 9.3s Time] [2022-11-23 14:59:35,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 508 states. [2022-11-23 14:59:35,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 508 to 344. [2022-11-23 14:59:35,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 260 states have (on average 1.2961538461538462) internal successors, (337), 283 states have internal predecessors, (337), 40 states have call successors, (40), 26 states have call predecessors, (40), 31 states have return successors, (53), 34 states have call predecessors, (53), 40 states have call successors, (53) [2022-11-23 14:59:35,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 430 transitions. [2022-11-23 14:59:35,504 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 430 transitions. Word has length 36 [2022-11-23 14:59:35,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-23 14:59:35,505 INFO L495 AbstractCegarLoop]: Abstraction has 344 states and 430 transitions. [2022-11-23 14:59:35,505 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 33 states have (on average 2.3636363636363638) internal successors, (78), 32 states have internal predecessors, (78), 6 states have call successors, (6), 2 states have call predecessors, (6), 6 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2022-11-23 14:59:35,505 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 430 transitions. [2022-11-23 14:59:35,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-23 14:59:35,506 INFO L187 NwaCegarLoop]: Found error trace [2022-11-23 14:59:35,506 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, 1, 1, 1, 1, 1, 1, 1] [2022-11-23 14:59:35,516 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-23 14:59:35,712 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:35,713 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr25REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 41 more)] === [2022-11-23 14:59:35,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-23 14:59:35,713 INFO L85 PathProgramCache]: Analyzing trace with hash -1290235476, now seen corresponding path program 2 times [2022-11-23 14:59:35,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-23 14:59:35,713 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1581856806] [2022-11-23 14:59:35,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-23 14:59:35,713 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-23 14:59:35,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-23 14:59:37,637 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-23 14:59:37,638 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-23 14:59:37,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1581856806] [2022-11-23 14:59:37,638 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1581856806] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-23 14:59:37,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1206851623] [2022-11-23 14:59:37,638 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-23 14:59:37,638 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-23 14:59:37,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 [2022-11-23 14:59:37,640 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-23 14:59:37,652 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_3537712b-74fd-47cb-b7c0-5b5ff8ec0cba/bin/utaipan-Q6hlc19bkW/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-23 14:59:37,928 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-11-23 14:59:37,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-23 14:59:37,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 85 conjunts are in the unsatisfiable core [2022-11-23 14:59:37,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-23 14:59:38,084 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:59:38,105 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select 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 [2022-11-23 14:59:38,190 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 20 [2022-11-23 14:59:38,202 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 [2022-11-23 14:59:38,239 INFO L321 Elim1Store]: treesize reduction 37, result has 15.9 percent of original size [2022-11-23 14:59:38,239 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 58 treesize of output 44 [2022-11-23 14:59:38,272 INFO L321 Elim1Store]: treesize reduction 17, result has 46.9 percent of original size [2022-11-23 14:59:38,273 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 38 treesize of output 40 [2022-11-23 14:59:40,573 INFO L321 Elim1Store]: treesize reduction 34, result has 65.7 percent of original size [2022-11-23 14:59:40,573 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 5 new quantified variables, introduced 6 case distinctions, treesize of input 131 treesize of output 154 [2022-11-23 14:59:40,684 INFO L321 Elim1Store]: treesize reduction 28, result has 65.4 percent of original size [2022-11-23 14:59:40,684 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 5 new quantified variables, introduced 6 case distinctions, treesize of input 129 treesize of output 140 [2022-11-23 14:59:43,139 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-23 14:59:43,139 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-23 14:59:43,750 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 14:59:43,751 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 90 treesize of output 130 [2022-11-23 15:00:00,645 WARN L233 SmtUtils]: Spent 12.63s on a formula simplification. DAG size of input: 68 DAG size of output: 64 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:00:07,243 WARN L233 SmtUtils]: Spent 6.36s on a formula simplification that was a NOOP. DAG size: 72 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-23 15:00:07,640 INFO L321 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2022-11-23 15:00:07,641 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 42 treesize of output 64 [2022-11-23 15:00:15,048 INFO L321 Elim1Store]: treesize reduction 1111, result has 25.3 percent of original size [2022-11-23 15:00:15,049 INFO L350 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 12 case distinctions, treesize of input 162783 treesize of output 150486 [2022-11-23 15:00:16,087 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 3154967 treesize of output 3035639