./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/fragtest_simple.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 2329fc70 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_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/fragtest_simple.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash be3b53cc5f9badbf5402cafcfa5766831674eb009261bc7c1bcbe9580aece38e --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-2329fc7 [2022-12-14 08:45:15,407 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 08:45:15,409 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 08:45:15,428 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 08:45:15,429 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 08:45:15,430 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 08:45:15,431 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 08:45:15,433 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 08:45:15,434 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 08:45:15,435 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 08:45:15,436 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 08:45:15,437 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 08:45:15,437 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 08:45:15,438 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 08:45:15,439 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 08:45:15,440 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 08:45:15,441 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 08:45:15,442 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 08:45:15,443 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 08:45:15,445 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 08:45:15,446 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 08:45:15,448 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 08:45:15,449 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 08:45:15,449 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 08:45:15,453 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 08:45:15,453 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 08:45:15,453 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 08:45:15,454 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 08:45:15,455 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 08:45:15,456 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 08:45:15,456 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 08:45:15,457 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 08:45:15,458 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 08:45:15,458 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 08:45:15,459 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 08:45:15,460 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 08:45:15,460 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 08:45:15,460 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 08:45:15,461 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 08:45:15,461 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 08:45:15,462 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 08:45:15,463 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 08:45:15,484 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 08:45:15,485 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 08:45:15,485 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 08:45:15,485 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 08:45:15,486 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 08:45:15,486 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 08:45:15,486 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 08:45:15,486 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 08:45:15,486 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 08:45:15,487 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 08:45:15,487 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 08:45:15,487 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 08:45:15,487 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 08:45:15,487 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 08:45:15,487 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 08:45:15,487 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 08:45:15,488 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 08:45:15,488 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 08:45:15,488 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 08:45:15,489 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 08:45:15,489 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 08:45:15,489 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 08:45:15,489 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 08:45:15,489 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 08:45:15,489 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 08:45:15,489 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 08:45:15,490 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 08:45:15,490 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 08:45:15,490 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 08:45:15,490 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 08:45:15,490 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 08:45:15,490 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 08:45:15,490 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 08:45:15,491 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 08:45:15,491 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 08:45:15,491 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 08:45:15,491 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 08:45:15,491 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 08:45:15,491 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 08:45:15,491 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 08:45:15,491 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 08:45:15,491 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_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> be3b53cc5f9badbf5402cafcfa5766831674eb009261bc7c1bcbe9580aece38e [2022-12-14 08:45:15,687 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 08:45:15,706 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 08:45:15,708 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 08:45:15,709 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 08:45:15,710 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 08:45:15,711 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/loop-invgen/fragtest_simple.i [2022-12-14 08:45:18,351 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 08:45:18,497 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 08:45:18,497 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/sv-benchmarks/c/loop-invgen/fragtest_simple.i [2022-12-14 08:45:18,502 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/data/c7f1c1027/1da1cac239bf48b5b6c67709f70d7111/FLAGea11f6fd9 [2022-12-14 08:45:18,512 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/data/c7f1c1027/1da1cac239bf48b5b6c67709f70d7111 [2022-12-14 08:45:18,513 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 08:45:18,514 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 08:45:18,515 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 08:45:18,515 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 08:45:18,518 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 08:45:18,518 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 08:45:18" (1/1) ... [2022-12-14 08:45:18,519 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2cbeed24 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:45:18, skipping insertion in model container [2022-12-14 08:45:18,519 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 08:45:18" (1/1) ... [2022-12-14 08:45:18,524 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 08:45:18,537 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 08:45:18,651 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_377048ca-e1ba-433d-b850-a9c5dae248b2/sv-benchmarks/c/loop-invgen/fragtest_simple.i[893,906] [2022-12-14 08:45:18,660 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 08:45:18,667 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 08:45:18,676 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_377048ca-e1ba-433d-b850-a9c5dae248b2/sv-benchmarks/c/loop-invgen/fragtest_simple.i[893,906] [2022-12-14 08:45:18,680 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 08:45:18,689 INFO L208 MainTranslator]: Completed translation [2022-12-14 08:45:18,690 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:45:18 WrapperNode [2022-12-14 08:45:18,690 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 08:45:18,691 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 08:45:18,691 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 08:45:18,691 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 08:45:18,696 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:45:18" (1/1) ... [2022-12-14 08:45:18,701 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:45:18" (1/1) ... [2022-12-14 08:45:18,714 INFO L138 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 59 [2022-12-14 08:45:18,714 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 08:45:18,714 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 08:45:18,714 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 08:45:18,715 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 08:45:18,721 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:45:18" (1/1) ... [2022-12-14 08:45:18,721 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:45:18" (1/1) ... [2022-12-14 08:45:18,722 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:45:18" (1/1) ... [2022-12-14 08:45:18,722 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:45:18" (1/1) ... [2022-12-14 08:45:18,724 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:45:18" (1/1) ... [2022-12-14 08:45:18,726 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:45:18" (1/1) ... [2022-12-14 08:45:18,727 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:45:18" (1/1) ... [2022-12-14 08:45:18,728 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:45:18" (1/1) ... [2022-12-14 08:45:18,729 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 08:45:18,729 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 08:45:18,729 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 08:45:18,729 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 08:45:18,730 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:45:18" (1/1) ... [2022-12-14 08:45:18,735 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 08:45:18,743 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:18,752 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 08:45:18,754 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 08:45:18,780 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 08:45:18,781 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 08:45:18,781 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 08:45:18,781 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 08:45:18,833 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 08:45:18,835 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 08:45:18,921 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 08:45:18,948 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 08:45:18,948 INFO L300 CfgBuilder]: Removed 3 assume(true) statements. [2022-12-14 08:45:18,951 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 08:45:18 BoogieIcfgContainer [2022-12-14 08:45:18,951 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 08:45:18,954 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 08:45:18,954 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 08:45:18,957 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 08:45:18,957 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 08:45:18" (1/3) ... [2022-12-14 08:45:18,958 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52751296 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 08:45:18, skipping insertion in model container [2022-12-14 08:45:18,958 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 08:45:18" (2/3) ... [2022-12-14 08:45:18,959 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52751296 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 08:45:18, skipping insertion in model container [2022-12-14 08:45:18,959 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 08:45:18" (3/3) ... [2022-12-14 08:45:18,960 INFO L112 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2022-12-14 08:45:18,978 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 08:45:18,978 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 08:45:19,028 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 08:45:19,035 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@6492b31a, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 08:45:19,035 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 08:45:19,039 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:19,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2022-12-14 08:45:19,045 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:19,048 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:19,048 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:19,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:19,054 INFO L85 PathProgramCache]: Analyzing trace with hash 1621408492, now seen corresponding path program 1 times [2022-12-14 08:45:19,063 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:19,063 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1756923638] [2022-12-14 08:45:19,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:19,064 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:19,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:19,195 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:19,195 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:19,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1756923638] [2022-12-14 08:45:19,196 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1756923638] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 08:45:19,197 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 08:45:19,197 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2022-12-14 08:45:19,198 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254779034] [2022-12-14 08:45:19,199 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 08:45:19,203 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2022-12-14 08:45:19,203 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:19,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2022-12-14 08:45:19,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-12-14 08:45:19,240 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:19,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:19,260 INFO L93 Difference]: Finished difference Result 27 states and 37 transitions. [2022-12-14 08:45:19,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2022-12-14 08:45:19,262 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2022-12-14 08:45:19,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:19,276 INFO L225 Difference]: With dead ends: 27 [2022-12-14 08:45:19,276 INFO L226 Difference]: Without dead ends: 13 [2022-12-14 08:45:19,278 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2022-12-14 08:45:19,281 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:19,282 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:45:19,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-12-14 08:45:19,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-12-14 08:45:19,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:19,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2022-12-14 08:45:19,305 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 8 [2022-12-14 08:45:19,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:19,305 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2022-12-14 08:45:19,306 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:19,306 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2022-12-14 08:45:19,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-12-14 08:45:19,306 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:19,306 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:19,307 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 08:45:19,307 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:19,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:19,308 INFO L85 PathProgramCache]: Analyzing trace with hash -134467088, now seen corresponding path program 1 times [2022-12-14 08:45:19,308 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:19,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1473938175] [2022-12-14 08:45:19,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:19,309 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:19,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:19,472 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:19,473 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:19,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1473938175] [2022-12-14 08:45:19,473 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1473938175] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 08:45:19,473 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 08:45:19,473 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 08:45:19,474 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976089865] [2022-12-14 08:45:19,474 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 08:45:19,475 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 08:45:19,475 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:19,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 08:45:19,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 08:45:19,476 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:19,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:19,507 INFO L93 Difference]: Finished difference Result 18 states and 20 transitions. [2022-12-14 08:45:19,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 08:45:19,507 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2022-12-14 08:45:19,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:19,508 INFO L225 Difference]: With dead ends: 18 [2022-12-14 08:45:19,508 INFO L226 Difference]: Without dead ends: 16 [2022-12-14 08:45:19,508 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-12-14 08:45:19,510 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 7 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:19,510 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 21 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:45:19,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-12-14 08:45:19,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2022-12-14 08:45:19,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:19,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2022-12-14 08:45:19,516 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2022-12-14 08:45:19,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:19,516 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2022-12-14 08:45:19,516 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:19,517 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2022-12-14 08:45:19,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 08:45:19,517 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:19,517 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:19,517 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 08:45:19,518 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:19,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:19,519 INFO L85 PathProgramCache]: Analyzing trace with hash 1655368611, now seen corresponding path program 1 times [2022-12-14 08:45:19,519 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:19,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1130009119] [2022-12-14 08:45:19,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:19,519 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:19,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:19,634 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:19,634 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:19,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1130009119] [2022-12-14 08:45:19,634 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1130009119] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 08:45:19,635 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 08:45:19,635 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-12-14 08:45:19,635 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890835296] [2022-12-14 08:45:19,635 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 08:45:19,636 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 08:45:19,636 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:19,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 08:45:19,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-12-14 08:45:19,637 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:19,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:19,678 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2022-12-14 08:45:19,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 08:45:19,679 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2022-12-14 08:45:19,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:19,679 INFO L225 Difference]: With dead ends: 31 [2022-12-14 08:45:19,679 INFO L226 Difference]: Without dead ends: 20 [2022-12-14 08:45:19,679 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 [2022-12-14 08:45:19,680 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 5 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:19,681 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 26 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:45:19,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2022-12-14 08:45:19,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2022-12-14 08:45:19,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:19,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2022-12-14 08:45:19,684 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 14 [2022-12-14 08:45:19,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:19,684 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2022-12-14 08:45:19,684 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:19,684 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2022-12-14 08:45:19,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-12-14 08:45:19,685 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:19,685 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:19,685 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-12-14 08:45:19,685 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:19,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:19,686 INFO L85 PathProgramCache]: Analyzing trace with hash 233966664, now seen corresponding path program 1 times [2022-12-14 08:45:19,686 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:19,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1559525520] [2022-12-14 08:45:19,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:19,686 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:19,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:19,787 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:19,787 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:19,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1559525520] [2022-12-14 08:45:19,788 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1559525520] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:19,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1310222161] [2022-12-14 08:45:19,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:19,788 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:19,788 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:19,789 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:19,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 08:45:19,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:19,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 08:45:19,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:19,920 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:19,920 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:19,965 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:19,965 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1310222161] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:19,965 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [539931010] [2022-12-14 08:45:19,980 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:19,981 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:19,983 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:19,987 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:19,988 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:20,261 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:20,555 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '297#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:20,556 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:20,556 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:20,556 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6] total 12 [2022-12-14 08:45:20,556 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339700713] [2022-12-14 08:45:20,556 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:20,556 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-12-14 08:45:20,556 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:20,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-12-14 08:45:20,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2022-12-14 08:45:20,557 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:20,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:20,678 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2022-12-14 08:45:20,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 08:45:20,679 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-12-14 08:45:20,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:20,679 INFO L225 Difference]: With dead ends: 41 [2022-12-14 08:45:20,679 INFO L226 Difference]: Without dead ends: 30 [2022-12-14 08:45:20,680 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=131, Invalid=681, Unknown=0, NotChecked=0, Total=812 [2022-12-14 08:45:20,680 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 26 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 104 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:20,681 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 41 Invalid, 104 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:45:20,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2022-12-14 08:45:20,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 23. [2022-12-14 08:45:20,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:20,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2022-12-14 08:45:20,684 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 16 [2022-12-14 08:45:20,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:20,684 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2022-12-14 08:45:20,684 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:20,684 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2022-12-14 08:45:20,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-12-14 08:45:20,684 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:20,684 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:20,690 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 08:45:20,885 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:20,887 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:20,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:20,888 INFO L85 PathProgramCache]: Analyzing trace with hash 885992160, now seen corresponding path program 2 times [2022-12-14 08:45:20,889 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:20,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475092521] [2022-12-14 08:45:20,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:20,890 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:20,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:21,073 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:21,073 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:21,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475092521] [2022-12-14 08:45:21,074 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [475092521] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:21,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101020918] [2022-12-14 08:45:21,074 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:45:21,074 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:21,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:21,075 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:21,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 08:45:21,114 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 08:45:21,114 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:45:21,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 08:45:21,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:21,187 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:21,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:21,234 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:21,235 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1101020918] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:21,235 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1823503075] [2022-12-14 08:45:21,238 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:21,238 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:21,238 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:21,238 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:21,238 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:21,361 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:21,628 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '552#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:21,628 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:21,628 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:21,628 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2022-12-14 08:45:21,628 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640089627] [2022-12-14 08:45:21,628 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:21,629 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 08:45:21,629 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:21,629 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 08:45:21,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462 [2022-12-14 08:45:21,630 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:21,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:21,688 INFO L93 Difference]: Finished difference Result 49 states and 55 transitions. [2022-12-14 08:45:21,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 08:45:21,689 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2022-12-14 08:45:21,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:21,690 INFO L225 Difference]: With dead ends: 49 [2022-12-14 08:45:21,691 INFO L226 Difference]: Without dead ends: 34 [2022-12-14 08:45:21,691 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 48 SyntacticMatches, 4 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=103, Invalid=497, Unknown=0, NotChecked=0, Total=600 [2022-12-14 08:45:21,692 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 21 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:21,693 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 47 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:45:21,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2022-12-14 08:45:21,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 25. [2022-12-14 08:45:21,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.125) internal successors, (27), 24 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:21,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2022-12-14 08:45:21,698 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 22 [2022-12-14 08:45:21,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:21,698 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2022-12-14 08:45:21,698 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.923076923076923) internal successors, (38), 13 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:21,698 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2022-12-14 08:45:21,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 08:45:21,699 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:21,699 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:21,704 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2022-12-14 08:45:21,899 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:21,900 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:21,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:21,900 INFO L85 PathProgramCache]: Analyzing trace with hash -955132283, now seen corresponding path program 3 times [2022-12-14 08:45:21,901 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:21,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [238839551] [2022-12-14 08:45:21,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:21,901 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:21,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:22,055 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 6 proven. 14 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:22,055 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:22,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [238839551] [2022-12-14 08:45:22,056 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [238839551] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:22,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1593946423] [2022-12-14 08:45:22,056 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:45:22,056 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:22,056 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:22,057 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:22,058 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 08:45:22,095 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:45:22,095 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:45:22,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 08:45:22,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:22,134 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:22,134 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:22,176 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:22,176 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1593946423] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:22,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1825032724] [2022-12-14 08:45:22,179 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:22,179 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:22,179 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:22,179 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:22,179 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:22,285 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:22,533 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '818#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:22,533 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:22,533 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:22,533 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 9 [2022-12-14 08:45:22,533 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91772329] [2022-12-14 08:45:22,533 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:22,534 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 08:45:22,534 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:22,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 08:45:22,535 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2022-12-14 08:45:22,535 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand has 10 states, 10 states have (on average 4.5) internal successors, (45), 9 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:22,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:22,610 INFO L93 Difference]: Finished difference Result 42 states and 45 transitions. [2022-12-14 08:45:22,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 08:45:22,610 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 4.5) internal successors, (45), 9 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-12-14 08:45:22,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:22,611 INFO L225 Difference]: With dead ends: 42 [2022-12-14 08:45:22,611 INFO L226 Difference]: Without dead ends: 40 [2022-12-14 08:45:22,611 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 57 SyntacticMatches, 4 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 164 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=132, Invalid=468, Unknown=0, NotChecked=0, Total=600 [2022-12-14 08:45:22,612 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 23 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:22,613 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 60 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:45:22,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2022-12-14 08:45:22,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 33. [2022-12-14 08:45:22,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.09375) internal successors, (35), 32 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:22,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2022-12-14 08:45:22,618 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 24 [2022-12-14 08:45:22,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:22,619 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2022-12-14 08:45:22,619 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 4.5) internal successors, (45), 9 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:22,619 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2022-12-14 08:45:22,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-12-14 08:45:22,620 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:22,620 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:22,624 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 08:45:22,820 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:22,821 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:22,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:22,822 INFO L85 PathProgramCache]: Analyzing trace with hash 204854123, now seen corresponding path program 4 times [2022-12-14 08:45:22,822 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:22,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063631389] [2022-12-14 08:45:22,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:22,823 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:22,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:22,960 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 23 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:22,960 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:22,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2063631389] [2022-12-14 08:45:22,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2063631389] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:22,961 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1296461094] [2022-12-14 08:45:22,961 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:45:22,961 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:22,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:22,962 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:22,963 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 08:45:22,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:22,998 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 08:45:23,000 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:23,084 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 30 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:45:23,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:23,135 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 30 proven. 12 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:45:23,136 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1296461094] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:23,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [624229492] [2022-12-14 08:45:23,138 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:23,138 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:23,138 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:23,138 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:23,139 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:23,219 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:23,487 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1148#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:23,487 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:23,487 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:23,487 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 10] total 17 [2022-12-14 08:45:23,487 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823183449] [2022-12-14 08:45:23,487 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:23,488 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 08:45:23,488 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:23,488 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 08:45:23,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=545, Unknown=0, NotChecked=0, Total=650 [2022-12-14 08:45:23,489 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand has 17 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 17 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:23,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:23,579 INFO L93 Difference]: Finished difference Result 68 states and 75 transitions. [2022-12-14 08:45:23,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 08:45:23,580 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 17 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-12-14 08:45:23,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:23,580 INFO L225 Difference]: With dead ends: 68 [2022-12-14 08:45:23,580 INFO L226 Difference]: Without dead ends: 47 [2022-12-14 08:45:23,581 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 75 SyntacticMatches, 6 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=147, Invalid=723, Unknown=0, NotChecked=0, Total=870 [2022-12-14 08:45:23,582 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 19 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:23,582 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 88 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:45:23,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2022-12-14 08:45:23,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 35. [2022-12-14 08:45:23,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:23,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2022-12-14 08:45:23,587 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 32 [2022-12-14 08:45:23,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:23,587 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2022-12-14 08:45:23,588 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 17 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:23,588 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2022-12-14 08:45:23,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-12-14 08:45:23,588 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:23,588 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:23,594 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 08:45:23,789 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-12-14 08:45:23,789 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:23,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:23,790 INFO L85 PathProgramCache]: Analyzing trace with hash -289016624, now seen corresponding path program 5 times [2022-12-14 08:45:23,790 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:23,790 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998023104] [2022-12-14 08:45:23,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:23,790 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:23,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:23,929 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 23 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:23,929 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:23,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [998023104] [2022-12-14 08:45:23,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [998023104] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:23,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1883074700] [2022-12-14 08:45:23,930 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:45:23,930 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:23,930 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:23,931 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:23,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 08:45:23,973 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 08:45:23,973 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:45:23,974 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 08:45:23,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:24,076 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:24,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:24,142 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:24,142 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1883074700] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:24,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [359429698] [2022-12-14 08:45:24,143 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:24,144 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:24,144 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:24,144 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:24,144 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:24,248 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:24,487 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1528#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:24,487 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:24,487 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:24,487 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2022-12-14 08:45:24,487 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604062693] [2022-12-14 08:45:24,487 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:24,487 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 08:45:24,488 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:24,488 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 08:45:24,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=631, Unknown=0, NotChecked=0, Total=756 [2022-12-14 08:45:24,488 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:24,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:24,571 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2022-12-14 08:45:24,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 08:45:24,571 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-12-14 08:45:24,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:24,572 INFO L225 Difference]: With dead ends: 75 [2022-12-14 08:45:24,572 INFO L226 Difference]: Without dead ends: 52 [2022-12-14 08:45:24,572 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 78 SyntacticMatches, 8 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 370 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 08:45:24,573 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 35 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:24,573 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 103 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:45:24,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-12-14 08:45:24,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 37. [2022-12-14 08:45:24,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:24,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2022-12-14 08:45:24,576 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 34 [2022-12-14 08:45:24,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:24,576 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2022-12-14 08:45:24,577 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:24,577 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2022-12-14 08:45:24,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-12-14 08:45:24,577 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:24,577 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:24,581 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 08:45:24,778 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:24,778 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:24,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:24,780 INFO L85 PathProgramCache]: Analyzing trace with hash 1842565365, now seen corresponding path program 6 times [2022-12-14 08:45:24,780 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:24,780 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084323711] [2022-12-14 08:45:24,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:24,781 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:24,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:24,950 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 20 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:24,950 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:24,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084323711] [2022-12-14 08:45:24,950 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1084323711] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:24,950 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [291282492] [2022-12-14 08:45:24,950 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:45:24,950 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:24,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:24,951 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:24,952 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 08:45:24,995 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:45:24,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:45:24,996 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 08:45:24,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:25,041 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 30 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:25,041 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:25,093 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 30 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:25,094 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [291282492] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:25,094 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1414410180] [2022-12-14 08:45:25,095 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:25,095 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:25,095 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:25,095 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:25,095 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:25,177 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:25,392 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1928#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:25,392 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:25,392 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:25,392 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 11 [2022-12-14 08:45:25,393 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1347637740] [2022-12-14 08:45:25,393 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:25,393 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2022-12-14 08:45:25,393 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:25,394 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2022-12-14 08:45:25,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=332, Unknown=0, NotChecked=0, Total=420 [2022-12-14 08:45:25,394 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:25,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:25,467 INFO L93 Difference]: Finished difference Result 54 states and 57 transitions. [2022-12-14 08:45:25,468 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-12-14 08:45:25,468 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-12-14 08:45:25,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:25,468 INFO L225 Difference]: With dead ends: 54 [2022-12-14 08:45:25,468 INFO L226 Difference]: Without dead ends: 52 [2022-12-14 08:45:25,468 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 91 SyntacticMatches, 8 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=181, Invalid=631, Unknown=0, NotChecked=0, Total=812 [2022-12-14 08:45:25,469 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 30 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:25,469 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 72 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:45:25,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-12-14 08:45:25,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 45. [2022-12-14 08:45:25,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:25,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2022-12-14 08:45:25,473 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 36 [2022-12-14 08:45:25,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:25,473 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2022-12-14 08:45:25,473 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:25,473 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2022-12-14 08:45:25,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2022-12-14 08:45:25,474 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:25,474 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:25,478 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 08:45:25,674 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:25,676 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:25,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:25,676 INFO L85 PathProgramCache]: Analyzing trace with hash -590488101, now seen corresponding path program 7 times [2022-12-14 08:45:25,676 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:25,676 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [825712414] [2022-12-14 08:45:25,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:25,677 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:25,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:25,883 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 57 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:25,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:25,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [825712414] [2022-12-14 08:45:25,883 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [825712414] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:25,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2009378814] [2022-12-14 08:45:25,884 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:45:25,884 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:25,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:25,885 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:25,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 08:45:25,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:25,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 08:45:25,934 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:26,066 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 70 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:45:26,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:26,152 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 70 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:45:26,152 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2009378814] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:26,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1135255387] [2022-12-14 08:45:26,153 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:26,154 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:26,154 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:26,154 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:26,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:26,243 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:26,514 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2376#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:26,514 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:26,514 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:26,514 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 14] total 23 [2022-12-14 08:45:26,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [919749267] [2022-12-14 08:45:26,514 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:26,515 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-12-14 08:45:26,515 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:26,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-12-14 08:45:26,516 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=829, Unknown=0, NotChecked=0, Total=992 [2022-12-14 08:45:26,516 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 23 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:26,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:26,613 INFO L93 Difference]: Finished difference Result 94 states and 103 transitions. [2022-12-14 08:45:26,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 08:45:26,613 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 23 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 44 [2022-12-14 08:45:26,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:26,614 INFO L225 Difference]: With dead ends: 94 [2022-12-14 08:45:26,614 INFO L226 Difference]: Without dead ends: 65 [2022-12-14 08:45:26,614 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 105 SyntacticMatches, 10 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 513 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=249, Invalid=1157, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 08:45:26,615 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 42 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 132 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:26,615 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 105 Invalid, 132 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:45:26,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2022-12-14 08:45:26,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 47. [2022-12-14 08:45:26,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.065217391304348) internal successors, (49), 46 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:26,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 49 transitions. [2022-12-14 08:45:26,620 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 49 transitions. Word has length 44 [2022-12-14 08:45:26,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:26,620 INFO L495 AbstractCegarLoop]: Abstraction has 47 states and 49 transitions. [2022-12-14 08:45:26,620 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.3043478260869565) internal successors, (76), 23 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:26,620 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 49 transitions. [2022-12-14 08:45:26,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2022-12-14 08:45:26,620 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:26,620 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:26,624 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 08:45:26,821 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2022-12-14 08:45:26,822 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:26,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:26,824 INFO L85 PathProgramCache]: Analyzing trace with hash 1692798912, now seen corresponding path program 8 times [2022-12-14 08:45:26,825 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:26,825 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680336711] [2022-12-14 08:45:26,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:26,826 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:26,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:27,039 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 57 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:27,039 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:27,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1680336711] [2022-12-14 08:45:27,039 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1680336711] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:27,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282137360] [2022-12-14 08:45:27,040 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:45:27,040 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:27,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:27,041 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:27,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 08:45:27,093 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 08:45:27,093 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:45:27,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 08:45:27,096 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:27,212 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 72 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:27,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:27,287 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 72 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:27,287 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282137360] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:27,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [773327907] [2022-12-14 08:45:27,288 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:27,288 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:27,288 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:27,288 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:27,288 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:27,382 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:27,617 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2894#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:27,617 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:27,618 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:27,618 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2022-12-14 08:45:27,618 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505873495] [2022-12-14 08:45:27,618 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:27,618 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 08:45:27,618 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:27,619 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 08:45:27,620 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=189, Invalid=933, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 08:45:27,620 INFO L87 Difference]: Start difference. First operand 47 states and 49 transitions. Second operand has 25 states, 25 states have (on average 3.12) internal successors, (78), 25 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:27,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:27,742 INFO L93 Difference]: Finished difference Result 101 states and 111 transitions. [2022-12-14 08:45:27,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 08:45:27,742 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 3.12) internal successors, (78), 25 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2022-12-14 08:45:27,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:27,743 INFO L225 Difference]: With dead ends: 101 [2022-12-14 08:45:27,743 INFO L226 Difference]: Without dead ends: 70 [2022-12-14 08:45:27,743 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 108 SyntacticMatches, 12 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 604 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=303, Invalid=1337, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 08:45:27,744 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 55 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 159 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:27,744 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 115 Invalid, 159 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:45:27,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-12-14 08:45:27,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 49. [2022-12-14 08:45:27,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0625) internal successors, (51), 48 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:27,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2022-12-14 08:45:27,750 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 46 [2022-12-14 08:45:27,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:27,750 INFO L495 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2022-12-14 08:45:27,751 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 3.12) internal successors, (78), 25 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:27,751 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2022-12-14 08:45:27,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2022-12-14 08:45:27,751 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:27,751 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:27,756 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 08:45:27,952 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2022-12-14 08:45:27,952 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:27,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:27,952 INFO L85 PathProgramCache]: Analyzing trace with hash 1203330149, now seen corresponding path program 9 times [2022-12-14 08:45:27,953 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:27,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618748699] [2022-12-14 08:45:27,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:27,953 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:27,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:28,114 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 42 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:28,114 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:28,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618748699] [2022-12-14 08:45:28,114 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [618748699] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:28,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [724630914] [2022-12-14 08:45:28,114 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:45:28,114 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:28,115 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:28,115 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:28,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 08:45:28,162 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:45:28,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:45:28,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 08:45:28,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:28,218 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 56 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:28,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:28,303 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 56 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:28,303 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [724630914] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:28,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1615242828] [2022-12-14 08:45:28,305 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:28,305 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:28,305 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:28,305 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:28,305 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:28,384 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:28,610 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3428#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:28,610 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:28,610 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:28,610 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 13 [2022-12-14 08:45:28,611 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135002044] [2022-12-14 08:45:28,611 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:28,611 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 08:45:28,611 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:28,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 08:45:28,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=399, Unknown=0, NotChecked=0, Total=506 [2022-12-14 08:45:28,612 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:28,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:28,705 INFO L93 Difference]: Finished difference Result 66 states and 69 transitions. [2022-12-14 08:45:28,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 08:45:28,705 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2022-12-14 08:45:28,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:28,706 INFO L225 Difference]: With dead ends: 66 [2022-12-14 08:45:28,706 INFO L226 Difference]: Without dead ends: 64 [2022-12-14 08:45:28,706 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 125 SyntacticMatches, 12 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 364 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=242, Invalid=814, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 08:45:28,707 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 39 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:28,707 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [39 Valid, 103 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:45:28,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2022-12-14 08:45:28,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 57. [2022-12-14 08:45:28,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:28,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2022-12-14 08:45:28,714 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 48 [2022-12-14 08:45:28,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:28,714 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2022-12-14 08:45:28,714 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:28,714 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2022-12-14 08:45:28,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2022-12-14 08:45:28,715 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:28,715 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:28,719 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2022-12-14 08:45:28,916 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-12-14 08:45:28,917 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:28,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:28,918 INFO L85 PathProgramCache]: Analyzing trace with hash 1063876939, now seen corresponding path program 10 times [2022-12-14 08:45:28,918 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:28,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1100686373] [2022-12-14 08:45:28,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:28,919 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:28,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:29,143 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 107 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:29,143 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:29,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1100686373] [2022-12-14 08:45:29,143 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1100686373] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:29,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1093340237] [2022-12-14 08:45:29,143 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:45:29,143 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:29,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:29,144 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:29,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 08:45:29,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:29,193 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 08:45:29,195 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:29,356 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 126 proven. 56 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:45:29,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:29,462 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 126 proven. 56 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:45:29,462 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1093340237] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:29,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1390275436] [2022-12-14 08:45:29,463 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:29,463 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:29,464 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:29,464 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:29,464 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:29,558 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:29,838 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3994#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:29,838 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:29,838 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:29,838 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18, 18] total 29 [2022-12-14 08:45:29,838 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [371342952] [2022-12-14 08:45:29,838 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:29,839 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-12-14 08:45:29,839 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:29,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-12-14 08:45:29,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=1169, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 08:45:29,839 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand has 29 states, 29 states have (on average 3.310344827586207) internal successors, (96), 29 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:29,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:29,978 INFO L93 Difference]: Finished difference Result 120 states and 131 transitions. [2022-12-14 08:45:29,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-12-14 08:45:29,979 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.310344827586207) internal successors, (96), 29 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2022-12-14 08:45:29,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:29,979 INFO L225 Difference]: With dead ends: 120 [2022-12-14 08:45:29,979 INFO L226 Difference]: Without dead ends: 83 [2022-12-14 08:45:29,980 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 135 SyntacticMatches, 14 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 779 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=383, Invalid=1687, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 08:45:29,980 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 55 mSDsluCounter, 120 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:29,980 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 138 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:45:29,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2022-12-14 08:45:29,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 59. [2022-12-14 08:45:29,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 58 states have (on average 1.0517241379310345) internal successors, (61), 58 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:29,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2022-12-14 08:45:29,984 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 56 [2022-12-14 08:45:29,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:29,984 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2022-12-14 08:45:29,984 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 3.310344827586207) internal successors, (96), 29 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:29,984 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2022-12-14 08:45:29,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2022-12-14 08:45:29,985 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:29,985 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:29,989 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-12-14 08:45:30,185 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:30,187 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:30,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:30,187 INFO L85 PathProgramCache]: Analyzing trace with hash -755696720, now seen corresponding path program 11 times [2022-12-14 08:45:30,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:30,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1873889613] [2022-12-14 08:45:30,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:30,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:30,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:30,402 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 107 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:30,402 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:30,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1873889613] [2022-12-14 08:45:30,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1873889613] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:30,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1468438862] [2022-12-14 08:45:30,402 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:45:30,402 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:30,402 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:30,403 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:30,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 08:45:30,462 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-12-14 08:45:30,462 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:45:30,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 08:45:30,465 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:30,659 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 128 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:30,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:30,780 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 128 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:30,780 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1468438862] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:30,780 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1024651871] [2022-12-14 08:45:30,782 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:30,782 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:30,782 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:30,782 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:30,782 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:30,857 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:31,116 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4650#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:31,116 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:31,117 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:31,117 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 31 [2022-12-14 08:45:31,117 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [535230321] [2022-12-14 08:45:31,117 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:31,117 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-12-14 08:45:31,117 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:31,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-12-14 08:45:31,119 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=1291, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 08:45:31,119 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand has 31 states, 31 states have (on average 3.161290322580645) internal successors, (98), 31 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:31,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:31,263 INFO L93 Difference]: Finished difference Result 127 states and 139 transitions. [2022-12-14 08:45:31,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 08:45:31,263 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 3.161290322580645) internal successors, (98), 31 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 58 [2022-12-14 08:45:31,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:31,264 INFO L225 Difference]: With dead ends: 127 [2022-12-14 08:45:31,264 INFO L226 Difference]: Without dead ends: 88 [2022-12-14 08:45:31,265 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 138 SyntacticMatches, 16 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 886 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=451, Invalid=1901, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 08:45:31,266 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 95 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 178 mSolverCounterSat, 45 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 155 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 178 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:31,266 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [95 Valid, 155 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 178 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:45:31,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-12-14 08:45:31,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 61. [2022-12-14 08:45:31,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.05) internal successors, (63), 60 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:31,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2022-12-14 08:45:31,273 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 58 [2022-12-14 08:45:31,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:31,273 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2022-12-14 08:45:31,273 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 3.161290322580645) internal successors, (98), 31 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:31,273 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2022-12-14 08:45:31,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2022-12-14 08:45:31,274 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:31,274 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:31,278 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 08:45:31,474 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2022-12-14 08:45:31,475 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:31,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:31,476 INFO L85 PathProgramCache]: Analyzing trace with hash -1314293547, now seen corresponding path program 12 times [2022-12-14 08:45:31,476 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:31,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790185103] [2022-12-14 08:45:31,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:31,477 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:31,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:31,656 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 72 proven. 146 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:31,656 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:31,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790185103] [2022-12-14 08:45:31,656 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [790185103] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:31,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [498036007] [2022-12-14 08:45:31,656 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:45:31,657 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:31,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:31,657 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:31,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 08:45:31,710 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:45:31,710 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:45:31,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 08:45:31,713 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:31,767 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 90 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:31,767 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:31,882 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 90 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:31,882 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [498036007] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:31,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1314966816] [2022-12-14 08:45:31,883 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:31,883 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:31,884 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:31,884 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:31,884 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:31,978 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:32,205 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5318#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:32,205 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:32,205 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:32,205 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 15 [2022-12-14 08:45:32,205 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612842723] [2022-12-14 08:45:32,205 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:32,205 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-12-14 08:45:32,205 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:32,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-12-14 08:45:32,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=470, Unknown=0, NotChecked=0, Total=600 [2022-12-14 08:45:32,206 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:32,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:32,330 INFO L93 Difference]: Finished difference Result 78 states and 81 transitions. [2022-12-14 08:45:32,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 08:45:32,331 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2022-12-14 08:45:32,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:32,331 INFO L225 Difference]: With dead ends: 78 [2022-12-14 08:45:32,331 INFO L226 Difference]: Without dead ends: 76 [2022-12-14 08:45:32,332 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 159 SyntacticMatches, 16 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 488 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=315, Invalid=1017, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 08:45:32,332 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 42 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:32,332 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 99 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:45:32,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2022-12-14 08:45:32,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 69. [2022-12-14 08:45:32,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:32,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2022-12-14 08:45:32,336 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 60 [2022-12-14 08:45:32,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:32,336 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2022-12-14 08:45:32,336 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:32,337 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2022-12-14 08:45:32,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-12-14 08:45:32,337 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:32,337 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:32,341 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 08:45:32,537 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-12-14 08:45:32,538 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:32,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:32,538 INFO L85 PathProgramCache]: Analyzing trace with hash 325985723, now seen corresponding path program 13 times [2022-12-14 08:45:32,538 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:32,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1834909243] [2022-12-14 08:45:32,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:32,538 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:32,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:32,758 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 173 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:32,758 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:32,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1834909243] [2022-12-14 08:45:32,758 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1834909243] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:32,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [185684422] [2022-12-14 08:45:32,758 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:45:32,758 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:32,759 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:32,759 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:32,760 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 08:45:32,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:32,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 08:45:32,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:32,992 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 198 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:45:32,992 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:33,155 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 198 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:45:33,155 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [185684422] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:33,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1124180516] [2022-12-14 08:45:33,156 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:33,156 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:33,157 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:33,157 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:33,157 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:33,237 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:33,526 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6002#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:33,526 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:33,527 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:33,527 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 35 [2022-12-14 08:45:33,527 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400640334] [2022-12-14 08:45:33,527 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:33,527 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 08:45:33,527 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:33,528 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 08:45:33,528 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=1565, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 08:45:33,529 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:33,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:33,667 INFO L93 Difference]: Finished difference Result 146 states and 159 transitions. [2022-12-14 08:45:33,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 08:45:33,667 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 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 68 [2022-12-14 08:45:33,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:33,668 INFO L225 Difference]: With dead ends: 146 [2022-12-14 08:45:33,668 INFO L226 Difference]: Without dead ends: 101 [2022-12-14 08:45:33,668 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 165 SyntacticMatches, 18 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1093 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=549, Invalid=2313, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 08:45:33,669 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 65 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 175 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 175 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:33,669 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 168 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 175 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:45:33,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2022-12-14 08:45:33,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 71. [2022-12-14 08:45:33,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:33,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2022-12-14 08:45:33,673 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 68 [2022-12-14 08:45:33,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:33,673 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2022-12-14 08:45:33,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:33,673 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2022-12-14 08:45:33,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2022-12-14 08:45:33,674 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:33,674 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:33,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-12-14 08:45:33,874 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 08:45:33,875 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:33,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:33,876 INFO L85 PathProgramCache]: Analyzing trace with hash 1366833312, now seen corresponding path program 14 times [2022-12-14 08:45:33,876 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:33,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12278034] [2022-12-14 08:45:33,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:33,877 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:33,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:34,159 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 173 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:34,160 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:34,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [12278034] [2022-12-14 08:45:34,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [12278034] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:34,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1341603073] [2022-12-14 08:45:34,160 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:45:34,160 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:34,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:34,161 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:34,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 08:45:34,213 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2022-12-14 08:45:34,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:45:34,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 08:45:34,215 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:34,412 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 200 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:34,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:34,586 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 200 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:34,586 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1341603073] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:34,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [663132583] [2022-12-14 08:45:34,587 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:34,588 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:34,588 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:34,588 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:34,588 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:34,670 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:34,969 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6796#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:34,970 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:34,970 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:34,970 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 37 [2022-12-14 08:45:34,970 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [515522219] [2022-12-14 08:45:34,970 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:34,970 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2022-12-14 08:45:34,971 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:34,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2022-12-14 08:45:34,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=365, Invalid=1705, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 08:45:34,972 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 37 states, 37 states have (on average 3.189189189189189) internal successors, (118), 37 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:35,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:35,149 INFO L93 Difference]: Finished difference Result 153 states and 167 transitions. [2022-12-14 08:45:35,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 08:45:35,149 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 3.189189189189189) internal successors, (118), 37 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2022-12-14 08:45:35,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:35,149 INFO L225 Difference]: With dead ends: 153 [2022-12-14 08:45:35,149 INFO L226 Difference]: Without dead ends: 106 [2022-12-14 08:45:35,150 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 168 SyntacticMatches, 20 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1216 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=631, Invalid=2561, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 08:45:35,150 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 87 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 241 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 219 SdHoareTripleChecker+Invalid, 279 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 241 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:35,150 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 219 Invalid, 279 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 241 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:45:35,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2022-12-14 08:45:35,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 73. [2022-12-14 08:45:35,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.0416666666666667) internal successors, (75), 72 states have internal predecessors, (75), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:35,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2022-12-14 08:45:35,155 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 70 [2022-12-14 08:45:35,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:35,155 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2022-12-14 08:45:35,155 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 3.189189189189189) internal successors, (118), 37 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:35,155 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2022-12-14 08:45:35,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2022-12-14 08:45:35,155 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:35,155 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 11, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:35,160 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 08:45:35,356 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-12-14 08:45:35,357 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:35,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:35,359 INFO L85 PathProgramCache]: Analyzing trace with hash 893986373, now seen corresponding path program 15 times [2022-12-14 08:45:35,359 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:35,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [27072128] [2022-12-14 08:45:35,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:35,360 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:35,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:35,567 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 110 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:35,567 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:35,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [27072128] [2022-12-14 08:45:35,567 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [27072128] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:35,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1851087605] [2022-12-14 08:45:35,567 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:45:35,567 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:35,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:35,568 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:35,569 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 08:45:35,620 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:45:35,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:45:35,621 INFO L263 TraceCheckSpWp]: Trace formula consists of 277 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 08:45:35,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:35,694 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 132 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:35,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:35,836 INFO L134 CoverageAnalysis]: Checked inductivity of 332 backedges. 132 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:35,836 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1851087605] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:35,836 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [652152046] [2022-12-14 08:45:35,837 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:35,838 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:35,838 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:35,838 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:35,838 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:35,902 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:36,138 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7598#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:36,138 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:36,138 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:36,139 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 17 [2022-12-14 08:45:36,139 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409539669] [2022-12-14 08:45:36,139 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:36,139 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-12-14 08:45:36,139 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:36,140 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-12-14 08:45:36,140 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=545, Unknown=0, NotChecked=0, Total=702 [2022-12-14 08:45:36,140 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand has 18 states, 18 states have (on average 5.166666666666667) internal successors, (93), 17 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:36,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:36,284 INFO L93 Difference]: Finished difference Result 90 states and 93 transitions. [2022-12-14 08:45:36,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-12-14 08:45:36,285 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 5.166666666666667) internal successors, (93), 17 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2022-12-14 08:45:36,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:36,285 INFO L225 Difference]: With dead ends: 90 [2022-12-14 08:45:36,286 INFO L226 Difference]: Without dead ends: 88 [2022-12-14 08:45:36,286 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 252 GetRequests, 193 SyntacticMatches, 20 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 628 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=400, Invalid=1240, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 08:45:36,287 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 87 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:36,287 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 119 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 08:45:36,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-12-14 08:45:36,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 81. [2022-12-14 08:45:36,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:36,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2022-12-14 08:45:36,293 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 72 [2022-12-14 08:45:36,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:36,293 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2022-12-14 08:45:36,293 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 5.166666666666667) internal successors, (93), 17 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:36,293 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2022-12-14 08:45:36,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2022-12-14 08:45:36,294 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:36,294 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 12, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:36,298 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-12-14 08:45:36,495 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 08:45:36,495 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:36,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:36,496 INFO L85 PathProgramCache]: Analyzing trace with hash -1526635733, now seen corresponding path program 16 times [2022-12-14 08:45:36,496 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:36,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1669498813] [2022-12-14 08:45:36,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:36,497 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:36,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:36,830 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 255 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:36,830 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:36,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1669498813] [2022-12-14 08:45:36,830 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1669498813] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:36,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2078089853] [2022-12-14 08:45:36,831 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:45:36,831 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:36,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:36,832 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:36,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 08:45:36,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:36,886 INFO L263 TraceCheckSpWp]: Trace formula consists of 301 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 08:45:36,887 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:37,188 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 286 proven. 132 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:45:37,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:37,424 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 286 proven. 132 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:45:37,424 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2078089853] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:37,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [439183815] [2022-12-14 08:45:37,426 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:37,426 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:37,426 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:37,426 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:37,426 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:37,501 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:37,897 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8400#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:37,897 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:37,897 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:37,897 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 26] total 41 [2022-12-14 08:45:37,897 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437503277] [2022-12-14 08:45:37,898 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:37,898 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-12-14 08:45:37,898 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:37,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-12-14 08:45:37,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=433, Invalid=2017, Unknown=0, NotChecked=0, Total=2450 [2022-12-14 08:45:37,900 INFO L87 Difference]: Start difference. First operand 81 states and 83 transitions. Second operand has 41 states, 41 states have (on average 3.317073170731707) internal successors, (136), 41 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:38,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:38,170 INFO L93 Difference]: Finished difference Result 172 states and 187 transitions. [2022-12-14 08:45:38,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 08:45:38,170 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.317073170731707) internal successors, (136), 41 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 80 [2022-12-14 08:45:38,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:38,171 INFO L225 Difference]: With dead ends: 172 [2022-12-14 08:45:38,171 INFO L226 Difference]: Without dead ends: 119 [2022-12-14 08:45:38,172 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 195 SyntacticMatches, 22 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1455 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=747, Invalid=3035, Unknown=0, NotChecked=0, Total=3782 [2022-12-14 08:45:38,172 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 85 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 299 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 278 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 299 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:38,172 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 278 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 299 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:45:38,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2022-12-14 08:45:38,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 83. [2022-12-14 08:45:38,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:38,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2022-12-14 08:45:38,177 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 80 [2022-12-14 08:45:38,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:38,177 INFO L495 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2022-12-14 08:45:38,177 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 3.317073170731707) internal successors, (136), 41 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:38,177 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2022-12-14 08:45:38,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-12-14 08:45:38,178 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:38,178 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:38,182 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-12-14 08:45:38,379 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:38,379 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:38,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:38,380 INFO L85 PathProgramCache]: Analyzing trace with hash -1246411120, now seen corresponding path program 17 times [2022-12-14 08:45:38,380 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:38,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [233410974] [2022-12-14 08:45:38,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:38,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:38,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:38,691 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 255 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:38,691 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:38,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [233410974] [2022-12-14 08:45:38,692 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [233410974] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:38,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1753419433] [2022-12-14 08:45:38,692 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:45:38,692 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:38,692 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:38,693 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:38,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 08:45:38,751 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2022-12-14 08:45:38,751 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:45:38,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 08:45:38,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:39,073 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 288 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:39,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:39,301 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 288 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:39,301 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1753419433] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:39,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2013376699] [2022-12-14 08:45:39,302 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:39,302 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:39,302 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:39,303 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:39,303 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:39,372 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:39,746 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9332#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:39,746 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:39,747 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:39,747 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2022-12-14 08:45:39,747 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170320262] [2022-12-14 08:45:39,747 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:39,747 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-12-14 08:45:39,747 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:39,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-12-14 08:45:39,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=2175, Unknown=0, NotChecked=0, Total=2652 [2022-12-14 08:45:39,748 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:40,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:40,018 INFO L93 Difference]: Finished difference Result 179 states and 195 transitions. [2022-12-14 08:45:40,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-12-14 08:45:40,018 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 82 [2022-12-14 08:45:40,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:40,018 INFO L225 Difference]: With dead ends: 179 [2022-12-14 08:45:40,018 INFO L226 Difference]: Without dead ends: 124 [2022-12-14 08:45:40,019 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 198 SyntacticMatches, 24 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1594 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=843, Invalid=3317, Unknown=0, NotChecked=0, Total=4160 [2022-12-14 08:45:40,020 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 90 mSDsluCounter, 246 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:40,020 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 274 Invalid, 329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:45:40,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-12-14 08:45:40,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 85. [2022-12-14 08:45:40,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:40,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2022-12-14 08:45:40,025 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 82 [2022-12-14 08:45:40,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:40,025 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2022-12-14 08:45:40,025 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:40,025 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2022-12-14 08:45:40,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2022-12-14 08:45:40,025 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:40,025 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:40,030 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-12-14 08:45:40,226 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:40,227 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:40,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:40,228 INFO L85 PathProgramCache]: Analyzing trace with hash 1761469621, now seen corresponding path program 18 times [2022-12-14 08:45:40,228 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:40,228 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [383306068] [2022-12-14 08:45:40,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:40,229 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:40,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:40,445 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 156 proven. 314 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:40,445 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:40,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [383306068] [2022-12-14 08:45:40,445 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [383306068] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:40,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [196216150] [2022-12-14 08:45:40,445 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:45:40,445 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:40,445 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:40,446 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:40,447 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 08:45:40,493 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:45:40,493 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:45:40,494 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 08:45:40,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:40,574 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 182 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:40,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:40,744 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 182 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:40,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [196216150] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:40,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [309661643] [2022-12-14 08:45:40,746 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:40,746 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:40,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:40,746 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:40,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:40,817 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:41,085 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10268#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:41,085 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:41,085 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:41,085 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 19 [2022-12-14 08:45:41,085 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581087369] [2022-12-14 08:45:41,085 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:41,086 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 08:45:41,086 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:41,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 08:45:41,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=188, Invalid=624, Unknown=0, NotChecked=0, Total=812 [2022-12-14 08:45:41,087 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:41,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:41,280 INFO L93 Difference]: Finished difference Result 102 states and 105 transitions. [2022-12-14 08:45:41,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-12-14 08:45:41,281 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 84 [2022-12-14 08:45:41,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:41,282 INFO L225 Difference]: With dead ends: 102 [2022-12-14 08:45:41,282 INFO L226 Difference]: Without dead ends: 100 [2022-12-14 08:45:41,283 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 227 SyntacticMatches, 24 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=497, Invalid=1483, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 08:45:41,284 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 56 mSDsluCounter, 130 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:41,284 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 152 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:45:41,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-12-14 08:45:41,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 93. [2022-12-14 08:45:41,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:41,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2022-12-14 08:45:41,290 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 84 [2022-12-14 08:45:41,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:41,290 INFO L495 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2022-12-14 08:45:41,290 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:41,290 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2022-12-14 08:45:41,291 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2022-12-14 08:45:41,291 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:41,291 INFO L195 NwaCegarLoop]: trace histogram [15, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:41,295 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-12-14 08:45:41,491 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2022-12-14 08:45:41,491 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:41,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:41,492 INFO L85 PathProgramCache]: Analyzing trace with hash -1928810085, now seen corresponding path program 19 times [2022-12-14 08:45:41,492 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:41,492 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397092561] [2022-12-14 08:45:41,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:41,492 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:41,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:41,883 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 353 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:41,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:41,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397092561] [2022-12-14 08:45:41,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1397092561] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:41,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1906824142] [2022-12-14 08:45:41,884 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:45:41,884 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:41,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:41,885 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:41,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 08:45:41,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:41,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 08:45:41,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:42,300 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 390 proven. 182 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:45:42,300 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:42,528 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 390 proven. 182 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:45:42,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1906824142] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:42,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [571081480] [2022-12-14 08:45:42,530 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:42,530 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:42,530 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:42,530 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:42,530 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:42,623 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:42,960 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11188#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:42,960 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:42,960 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:42,960 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 30, 30] total 47 [2022-12-14 08:45:42,960 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023781767] [2022-12-14 08:45:42,960 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:42,960 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-12-14 08:45:42,960 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:42,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-12-14 08:45:42,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=555, Invalid=2525, Unknown=0, NotChecked=0, Total=3080 [2022-12-14 08:45:42,962 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 47 states, 47 states have (on average 3.3191489361702127) internal successors, (156), 47 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:43,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:43,281 INFO L93 Difference]: Finished difference Result 198 states and 215 transitions. [2022-12-14 08:45:43,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-12-14 08:45:43,281 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 3.3191489361702127) internal successors, (156), 47 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 92 [2022-12-14 08:45:43,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:43,281 INFO L225 Difference]: With dead ends: 198 [2022-12-14 08:45:43,281 INFO L226 Difference]: Without dead ends: 137 [2022-12-14 08:45:43,282 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 319 GetRequests, 225 SyntacticMatches, 26 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1865 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=977, Invalid=3853, Unknown=0, NotChecked=0, Total=4830 [2022-12-14 08:45:43,283 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 116 mSDsluCounter, 219 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 116 SdHoareTripleChecker+Valid, 249 SdHoareTripleChecker+Invalid, 321 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:43,283 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [116 Valid, 249 Invalid, 321 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:45:43,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2022-12-14 08:45:43,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 95. [2022-12-14 08:45:43,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.0319148936170213) internal successors, (97), 94 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:43,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 97 transitions. [2022-12-14 08:45:43,288 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 97 transitions. Word has length 92 [2022-12-14 08:45:43,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:43,289 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 97 transitions. [2022-12-14 08:45:43,289 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 3.3191489361702127) internal successors, (156), 47 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:43,289 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 97 transitions. [2022-12-14 08:45:43,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2022-12-14 08:45:43,289 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:43,289 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:43,293 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-12-14 08:45:43,489 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-12-14 08:45:43,490 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:43,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:43,490 INFO L85 PathProgramCache]: Analyzing trace with hash 1907467648, now seen corresponding path program 20 times [2022-12-14 08:45:43,490 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:43,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977953846] [2022-12-14 08:45:43,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:43,490 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:43,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:43,837 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 353 proven. 249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:43,837 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:43,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977953846] [2022-12-14 08:45:43,838 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [977953846] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:43,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1361532848] [2022-12-14 08:45:43,838 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:45:43,838 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:43,838 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:43,839 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:43,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 08:45:43,919 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-12-14 08:45:43,919 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:45:43,922 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 08:45:43,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:44,356 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 392 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:44,357 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:44,622 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 392 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:44,622 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1361532848] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:44,622 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1362457673] [2022-12-14 08:45:44,622 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:44,623 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:44,623 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:44,623 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:44,623 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:44,688 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:45,082 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12258#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:45,082 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:45,082 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:45,082 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 49 [2022-12-14 08:45:45,082 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375123667] [2022-12-14 08:45:45,082 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:45,083 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-12-14 08:45:45,083 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:45,083 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-12-14 08:45:45,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=605, Invalid=2701, Unknown=0, NotChecked=0, Total=3306 [2022-12-14 08:45:45,084 INFO L87 Difference]: Start difference. First operand 95 states and 97 transitions. Second operand has 49 states, 49 states have (on average 3.2244897959183674) internal successors, (158), 49 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:45,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:45,420 INFO L93 Difference]: Finished difference Result 205 states and 223 transitions. [2022-12-14 08:45:45,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-12-14 08:45:45,420 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.2244897959183674) internal successors, (158), 49 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 94 [2022-12-14 08:45:45,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:45,421 INFO L225 Difference]: With dead ends: 205 [2022-12-14 08:45:45,421 INFO L226 Difference]: Without dead ends: 142 [2022-12-14 08:45:45,422 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 327 GetRequests, 228 SyntacticMatches, 28 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2020 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1087, Invalid=4169, Unknown=0, NotChecked=0, Total=5256 [2022-12-14 08:45:45,423 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 146 mSDsluCounter, 268 mSDsCounter, 0 mSdLazyCounter, 325 mSolverCounterSat, 67 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 300 SdHoareTripleChecker+Invalid, 392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 67 IncrementalHoareTripleChecker+Valid, 325 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:45,423 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 300 Invalid, 392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [67 Valid, 325 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:45:45,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2022-12-14 08:45:45,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 97. [2022-12-14 08:45:45,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:45,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2022-12-14 08:45:45,434 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 94 [2022-12-14 08:45:45,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:45,434 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2022-12-14 08:45:45,434 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 3.2244897959183674) internal successors, (158), 49 states have internal predecessors, (158), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:45,434 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2022-12-14 08:45:45,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-12-14 08:45:45,435 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:45,435 INFO L195 NwaCegarLoop]: trace histogram [16, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:45,439 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-12-14 08:45:45,635 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-12-14 08:45:45,636 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:45,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:45,637 INFO L85 PathProgramCache]: Analyzing trace with hash -806538203, now seen corresponding path program 21 times [2022-12-14 08:45:45,638 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:45,638 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [572350632] [2022-12-14 08:45:45,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:45,639 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:45,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:45,959 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 210 proven. 422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:45,959 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:45,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [572350632] [2022-12-14 08:45:45,959 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [572350632] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:45,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1721453540] [2022-12-14 08:45:45,959 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:45:45,959 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:45,960 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:45,960 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:45,965 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-12-14 08:45:46,020 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:45:46,020 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:45:46,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 36 conjunts are in the unsatisfiable core [2022-12-14 08:45:46,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:46,112 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 240 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:46,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:46,299 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 240 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:46,299 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1721453540] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:46,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1296957532] [2022-12-14 08:45:46,300 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:46,300 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:46,300 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:46,301 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:46,301 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:46,365 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:46,647 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13328#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:46,648 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:46,648 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:46,648 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 21 [2022-12-14 08:45:46,648 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804211799] [2022-12-14 08:45:46,648 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:46,648 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 08:45:46,648 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:46,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 08:45:46,649 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=707, Unknown=0, NotChecked=0, Total=930 [2022-12-14 08:45:46,649 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:46,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:46,885 INFO L93 Difference]: Finished difference Result 114 states and 117 transitions. [2022-12-14 08:45:46,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-12-14 08:45:46,885 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2022-12-14 08:45:46,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:46,886 INFO L225 Difference]: With dead ends: 114 [2022-12-14 08:45:46,886 INFO L226 Difference]: Without dead ends: 112 [2022-12-14 08:45:46,887 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 261 SyntacticMatches, 28 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 956 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=606, Invalid=1746, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 08:45:46,887 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 110 mSDsluCounter, 103 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:46,888 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 127 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:45:46,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2022-12-14 08:45:46,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 105. [2022-12-14 08:45:46,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:46,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2022-12-14 08:45:46,899 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 96 [2022-12-14 08:45:46,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:46,900 INFO L495 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2022-12-14 08:45:46,900 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:46,900 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2022-12-14 08:45:46,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2022-12-14 08:45:46,901 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:46,901 INFO L195 NwaCegarLoop]: trace histogram [17, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:46,906 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2022-12-14 08:45:47,101 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:47,102 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:47,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:47,103 INFO L85 PathProgramCache]: Analyzing trace with hash -1859546869, now seen corresponding path program 22 times [2022-12-14 08:45:47,103 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:47,103 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [950853354] [2022-12-14 08:45:47,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:47,104 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:47,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:47,539 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 467 proven. 285 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:47,539 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:47,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [950853354] [2022-12-14 08:45:47,539 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [950853354] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:47,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804501809] [2022-12-14 08:45:47,540 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:45:47,540 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:47,540 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:47,541 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:47,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-12-14 08:45:47,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:47,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 08:45:47,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:48,058 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 510 proven. 240 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:45:48,058 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:48,349 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 510 proven. 240 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:45:48,349 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804501809] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:48,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [769797556] [2022-12-14 08:45:48,350 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:48,350 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:48,351 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:48,351 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:48,351 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:48,425 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:48,779 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14366#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:48,779 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:48,779 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:48,779 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34, 34] total 53 [2022-12-14 08:45:48,779 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252833185] [2022-12-14 08:45:48,779 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:48,780 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-12-14 08:45:48,780 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:48,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-12-14 08:45:48,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=693, Invalid=3089, Unknown=0, NotChecked=0, Total=3782 [2022-12-14 08:45:48,780 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 53 states, 53 states have (on average 3.3207547169811322) internal successors, (176), 53 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:49,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:49,138 INFO L93 Difference]: Finished difference Result 224 states and 243 transitions. [2022-12-14 08:45:49,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-12-14 08:45:49,138 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 3.3207547169811322) internal successors, (176), 53 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2022-12-14 08:45:49,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:49,139 INFO L225 Difference]: With dead ends: 224 [2022-12-14 08:45:49,139 INFO L226 Difference]: Without dead ends: 155 [2022-12-14 08:45:49,139 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 255 SyntacticMatches, 30 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2323 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1239, Invalid=4767, Unknown=0, NotChecked=0, Total=6006 [2022-12-14 08:45:49,140 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 128 mSDsluCounter, 329 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 128 SdHoareTripleChecker+Valid, 363 SdHoareTripleChecker+Invalid, 442 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:49,140 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [128 Valid, 363 Invalid, 442 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 386 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:45:49,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2022-12-14 08:45:49,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 107. [2022-12-14 08:45:49,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 107 states, 106 states have (on average 1.028301886792453) internal successors, (109), 106 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:49,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 109 transitions. [2022-12-14 08:45:49,147 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 109 transitions. Word has length 104 [2022-12-14 08:45:49,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:49,147 INFO L495 AbstractCegarLoop]: Abstraction has 107 states and 109 transitions. [2022-12-14 08:45:49,147 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 3.3207547169811322) internal successors, (176), 53 states have internal predecessors, (176), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:49,147 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 109 transitions. [2022-12-14 08:45:49,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2022-12-14 08:45:49,147 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:49,147 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:49,151 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-12-14 08:45:49,348 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2022-12-14 08:45:49,348 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:49,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:49,349 INFO L85 PathProgramCache]: Analyzing trace with hash 1949488496, now seen corresponding path program 23 times [2022-12-14 08:45:49,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:49,350 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [221350954] [2022-12-14 08:45:49,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:49,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:49,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:49,797 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 467 proven. 317 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:49,797 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:49,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [221350954] [2022-12-14 08:45:49,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [221350954] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:49,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1378445421] [2022-12-14 08:45:49,797 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:45:49,797 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:49,797 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:49,798 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:49,799 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-12-14 08:45:49,869 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2022-12-14 08:45:49,870 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:45:49,871 INFO L263 TraceCheckSpWp]: Trace formula consists of 399 conjuncts, 36 conjunts are in the unsatisfiable core [2022-12-14 08:45:49,874 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:50,289 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 512 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:50,289 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:50,619 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 512 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:50,619 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1378445421] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:50,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [999090808] [2022-12-14 08:45:50,620 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:50,620 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:50,620 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:50,621 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:50,621 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:50,696 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:51,150 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15574#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:51,150 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:51,150 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:51,150 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 55 [2022-12-14 08:45:51,150 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927576243] [2022-12-14 08:45:51,150 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:51,151 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-12-14 08:45:51,151 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:51,152 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-12-14 08:45:51,152 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=749, Invalid=3283, Unknown=0, NotChecked=0, Total=4032 [2022-12-14 08:45:51,152 INFO L87 Difference]: Start difference. First operand 107 states and 109 transitions. Second operand has 55 states, 55 states have (on average 3.2363636363636363) internal successors, (178), 55 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:51,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:51,487 INFO L93 Difference]: Finished difference Result 231 states and 251 transitions. [2022-12-14 08:45:51,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-12-14 08:45:51,487 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 3.2363636363636363) internal successors, (178), 55 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 106 [2022-12-14 08:45:51,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:51,488 INFO L225 Difference]: With dead ends: 231 [2022-12-14 08:45:51,488 INFO L226 Difference]: Without dead ends: 160 [2022-12-14 08:45:51,488 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 369 GetRequests, 258 SyntacticMatches, 32 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2494 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1363, Invalid=5117, Unknown=0, NotChecked=0, Total=6480 [2022-12-14 08:45:51,489 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 147 mSDsluCounter, 273 mSDsCounter, 0 mSdLazyCounter, 337 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 402 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:51,489 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [147 Valid, 309 Invalid, 402 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 337 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:45:51,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-12-14 08:45:51,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 109. [2022-12-14 08:45:51,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 108 states have (on average 1.0277777777777777) internal successors, (111), 108 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:51,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2022-12-14 08:45:51,496 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 106 [2022-12-14 08:45:51,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:51,497 INFO L495 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2022-12-14 08:45:51,497 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 3.2363636363636363) internal successors, (178), 55 states have internal predecessors, (178), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:51,497 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2022-12-14 08:45:51,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2022-12-14 08:45:51,497 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:51,497 INFO L195 NwaCegarLoop]: trace histogram [18, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:51,502 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-12-14 08:45:51,698 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-12-14 08:45:51,698 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:51,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:51,699 INFO L85 PathProgramCache]: Analyzing trace with hash -1174629227, now seen corresponding path program 24 times [2022-12-14 08:45:51,699 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:51,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1162348963] [2022-12-14 08:45:51,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:51,700 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:51,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:52,041 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 272 proven. 546 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:52,041 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:52,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1162348963] [2022-12-14 08:45:52,041 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1162348963] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:52,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1369676042] [2022-12-14 08:45:52,041 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:45:52,041 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:52,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:52,042 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:52,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-12-14 08:45:52,096 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:45:52,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:45:52,098 INFO L263 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 40 conjunts are in the unsatisfiable core [2022-12-14 08:45:52,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:52,177 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 306 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:52,177 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:52,396 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 306 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:52,396 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1369676042] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:52,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [669653737] [2022-12-14 08:45:52,397 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:52,397 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:52,397 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:52,397 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:52,397 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:52,478 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:52,766 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16778#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:52,766 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:52,766 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:52,766 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 23 [2022-12-14 08:45:52,767 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283140298] [2022-12-14 08:45:52,767 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:52,767 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-12-14 08:45:52,767 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:52,768 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-12-14 08:45:52,768 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=262, Invalid=794, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 08:45:52,768 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:53,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:53,016 INFO L93 Difference]: Finished difference Result 126 states and 129 transitions. [2022-12-14 08:45:53,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-12-14 08:45:53,016 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 108 [2022-12-14 08:45:53,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:53,016 INFO L225 Difference]: With dead ends: 126 [2022-12-14 08:45:53,017 INFO L226 Difference]: Without dead ends: 124 [2022-12-14 08:45:53,017 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 295 SyntacticMatches, 32 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1144 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=727, Invalid=2029, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 08:45:53,017 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 67 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:53,017 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 180 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:45:53,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2022-12-14 08:45:53,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 117. [2022-12-14 08:45:53,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:53,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2022-12-14 08:45:53,026 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 108 [2022-12-14 08:45:53,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:53,026 INFO L495 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2022-12-14 08:45:53,026 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:53,026 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2022-12-14 08:45:53,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2022-12-14 08:45:53,027 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:53,027 INFO L195 NwaCegarLoop]: trace histogram [19, 18, 18, 18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:53,031 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-12-14 08:45:53,228 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-12-14 08:45:53,228 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:53,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:53,229 INFO L85 PathProgramCache]: Analyzing trace with hash -2083946117, now seen corresponding path program 25 times [2022-12-14 08:45:53,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:53,230 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1691895102] [2022-12-14 08:45:53,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:53,230 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:53,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:53,804 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 597 proven. 357 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:53,804 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:53,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1691895102] [2022-12-14 08:45:53,804 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1691895102] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:53,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [140381352] [2022-12-14 08:45:53,804 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:45:53,804 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:53,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:53,805 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:53,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-12-14 08:45:53,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:53,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 38 conjunts are in the unsatisfiable core [2022-12-14 08:45:53,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:54,285 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 646 proven. 306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:45:54,285 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:54,652 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 646 proven. 306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:45:54,652 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [140381352] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:54,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1322823143] [2022-12-14 08:45:54,653 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:54,653 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:54,653 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:54,654 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:54,654 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:54,729 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:55,120 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17934#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:55,120 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:55,120 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:55,120 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 59 [2022-12-14 08:45:55,120 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644542070] [2022-12-14 08:45:55,120 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:55,121 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-12-14 08:45:55,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:55,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-12-14 08:45:55,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=847, Invalid=3709, Unknown=0, NotChecked=0, Total=4556 [2022-12-14 08:45:55,122 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:55,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:55,494 INFO L93 Difference]: Finished difference Result 250 states and 271 transitions. [2022-12-14 08:45:55,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-12-14 08:45:55,494 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2022-12-14 08:45:55,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:55,495 INFO L225 Difference]: With dead ends: 250 [2022-12-14 08:45:55,495 INFO L226 Difference]: Without dead ends: 173 [2022-12-14 08:45:55,496 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 285 SyntacticMatches, 34 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2829 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1533, Invalid=5777, Unknown=0, NotChecked=0, Total=7310 [2022-12-14 08:45:55,496 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 134 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 448 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 425 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 448 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:55,496 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 425 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 448 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:45:55,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2022-12-14 08:45:55,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 119. [2022-12-14 08:45:55,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:55,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2022-12-14 08:45:55,504 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 116 [2022-12-14 08:45:55,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:55,504 INFO L495 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2022-12-14 08:45:55,504 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:55,504 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2022-12-14 08:45:55,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2022-12-14 08:45:55,505 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:55,505 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:55,509 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-12-14 08:45:55,705 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-12-14 08:45:55,706 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:55,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:55,707 INFO L85 PathProgramCache]: Analyzing trace with hash 146691680, now seen corresponding path program 26 times [2022-12-14 08:45:55,707 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:55,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546087817] [2022-12-14 08:45:55,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:55,708 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:55,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:56,287 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 597 proven. 393 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:56,287 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:56,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546087817] [2022-12-14 08:45:56,287 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546087817] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:56,287 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [990281850] [2022-12-14 08:45:56,288 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:45:56,288 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:56,288 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:56,289 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:56,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-12-14 08:45:56,361 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2022-12-14 08:45:56,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:45:56,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 40 conjunts are in the unsatisfiable core [2022-12-14 08:45:56,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:56,944 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 648 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:56,944 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:57,328 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 648 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:57,328 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [990281850] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:57,328 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [767249001] [2022-12-14 08:45:57,329 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:57,329 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:57,329 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:57,329 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:57,329 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:57,409 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:57,826 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19280#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:57,826 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:57,826 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:57,826 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 61 [2022-12-14 08:45:57,827 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845852345] [2022-12-14 08:45:57,827 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:57,827 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-12-14 08:45:57,827 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:57,828 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-12-14 08:45:57,828 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=909, Invalid=3921, Unknown=0, NotChecked=0, Total=4830 [2022-12-14 08:45:57,828 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 61 states, 61 states have (on average 3.2459016393442623) internal successors, (198), 61 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:58,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:45:58,255 INFO L93 Difference]: Finished difference Result 257 states and 279 transitions. [2022-12-14 08:45:58,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-12-14 08:45:58,255 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 3.2459016393442623) internal successors, (198), 61 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 118 [2022-12-14 08:45:58,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:45:58,256 INFO L225 Difference]: With dead ends: 257 [2022-12-14 08:45:58,256 INFO L226 Difference]: Without dead ends: 178 [2022-12-14 08:45:58,257 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 288 SyntacticMatches, 36 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3016 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1671, Invalid=6161, Unknown=0, NotChecked=0, Total=7832 [2022-12-14 08:45:58,257 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 130 mSDsluCounter, 374 mSDsCounter, 0 mSdLazyCounter, 426 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 483 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 426 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:45:58,258 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [130 Valid, 414 Invalid, 483 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 426 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:45:58,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2022-12-14 08:45:58,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 121. [2022-12-14 08:45:58,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:58,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2022-12-14 08:45:58,272 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 118 [2022-12-14 08:45:58,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:45:58,272 INFO L495 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2022-12-14 08:45:58,272 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 3.2459016393442623) internal successors, (198), 61 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:45:58,272 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2022-12-14 08:45:58,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2022-12-14 08:45:58,273 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:45:58,273 INFO L195 NwaCegarLoop]: trace histogram [20, 19, 19, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:45:58,277 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-12-14 08:45:58,473 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-12-14 08:45:58,473 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:45:58,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:45:58,474 INFO L85 PathProgramCache]: Analyzing trace with hash 600933893, now seen corresponding path program 27 times [2022-12-14 08:45:58,474 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:45:58,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687713001] [2022-12-14 08:45:58,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:45:58,474 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:45:58,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:45:58,936 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 342 proven. 686 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:58,936 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:45:58,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687713001] [2022-12-14 08:45:58,936 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1687713001] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:45:58,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1718411131] [2022-12-14 08:45:58,937 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:45:58,937 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:45:58,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:45:58,938 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:45:58,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-12-14 08:45:59,020 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:45:59,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:45:59,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 44 conjunts are in the unsatisfiable core [2022-12-14 08:45:59,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:45:59,130 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 380 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:59,130 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:45:59,436 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 380 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:45:59,436 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1718411131] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:45:59,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1241478863] [2022-12-14 08:45:59,437 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:45:59,437 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:45:59,437 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:45:59,437 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:45:59,437 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:45:59,515 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:45:59,769 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20618#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:45:59,769 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:45:59,769 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:45:59,769 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 25 [2022-12-14 08:45:59,770 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383501859] [2022-12-14 08:45:59,770 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:45:59,770 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 08:45:59,770 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:45:59,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 08:45:59,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=305, Invalid=885, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 08:45:59,771 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand has 26 states, 26 states have (on average 5.423076923076923) internal successors, (141), 25 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:00,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:46:00,029 INFO L93 Difference]: Finished difference Result 138 states and 141 transitions. [2022-12-14 08:46:00,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-12-14 08:46:00,030 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 5.423076923076923) internal successors, (141), 25 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 120 [2022-12-14 08:46:00,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:46:00,031 INFO L225 Difference]: With dead ends: 138 [2022-12-14 08:46:00,031 INFO L226 Difference]: Without dead ends: 136 [2022-12-14 08:46:00,031 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 420 GetRequests, 329 SyntacticMatches, 36 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1348 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=860, Invalid=2332, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 08:46:00,032 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 132 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:46:00,032 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [132 Valid, 153 Invalid, 184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:46:00,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2022-12-14 08:46:00,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 129. [2022-12-14 08:46:00,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 128 states have (on average 1.0234375) internal successors, (131), 128 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:00,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 131 transitions. [2022-12-14 08:46:00,043 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 131 transitions. Word has length 120 [2022-12-14 08:46:00,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:46:00,043 INFO L495 AbstractCegarLoop]: Abstraction has 129 states and 131 transitions. [2022-12-14 08:46:00,043 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 5.423076923076923) internal successors, (141), 25 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:00,043 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 131 transitions. [2022-12-14 08:46:00,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2022-12-14 08:46:00,044 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:46:00,044 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:46:00,048 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2022-12-14 08:46:00,244 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:00,244 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:46:00,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:46:00,244 INFO L85 PathProgramCache]: Analyzing trace with hash 604898027, now seen corresponding path program 28 times [2022-12-14 08:46:00,244 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:46:00,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30722358] [2022-12-14 08:46:00,245 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:46:00,245 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:46:00,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:00,866 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 743 proven. 437 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:00,866 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:46:00,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30722358] [2022-12-14 08:46:00,866 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30722358] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:46:00,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1721846565] [2022-12-14 08:46:00,866 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:46:00,866 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:00,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:46:00,867 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:46:00,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-12-14 08:46:00,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:00,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 42 conjunts are in the unsatisfiable core [2022-12-14 08:46:00,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:46:01,671 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 798 proven. 380 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:46:01,672 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:46:02,142 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 798 proven. 380 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:46:02,143 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1721846565] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:46:02,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1322052688] [2022-12-14 08:46:02,143 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:46:02,143 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:46:02,144 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:46:02,144 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:46:02,144 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:46:02,216 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:46:02,579 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21892#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:46:02,579 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:46:02,579 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:46:02,579 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 65 [2022-12-14 08:46:02,579 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138606775] [2022-12-14 08:46:02,579 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:46:02,580 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-12-14 08:46:02,580 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:46:02,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-12-14 08:46:02,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1017, Invalid=4385, Unknown=0, NotChecked=0, Total=5402 [2022-12-14 08:46:02,580 INFO L87 Difference]: Start difference. First operand 129 states and 131 transitions. Second operand has 65 states, 65 states have (on average 3.3230769230769233) internal successors, (216), 65 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:03,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:46:03,084 INFO L93 Difference]: Finished difference Result 276 states and 299 transitions. [2022-12-14 08:46:03,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-12-14 08:46:03,084 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.3230769230769233) internal successors, (216), 65 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 128 [2022-12-14 08:46:03,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:46:03,085 INFO L225 Difference]: With dead ends: 276 [2022-12-14 08:46:03,085 INFO L226 Difference]: Without dead ends: 191 [2022-12-14 08:46:03,086 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 315 SyntacticMatches, 38 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3383 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1859, Invalid=6883, Unknown=0, NotChecked=0, Total=8742 [2022-12-14 08:46:03,086 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 141 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 485 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 464 SdHoareTripleChecker+Invalid, 547 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 485 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:46:03,086 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [141 Valid, 464 Invalid, 547 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 485 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:46:03,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2022-12-14 08:46:03,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 131. [2022-12-14 08:46:03,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.023076923076923) internal successors, (133), 130 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:03,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2022-12-14 08:46:03,095 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 128 [2022-12-14 08:46:03,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:46:03,096 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2022-12-14 08:46:03,096 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 3.3230769230769233) internal successors, (216), 65 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:03,096 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2022-12-14 08:46:03,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2022-12-14 08:46:03,096 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:46:03,096 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:46:03,101 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-12-14 08:46:03,297 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:03,297 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:46:03,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:46:03,297 INFO L85 PathProgramCache]: Analyzing trace with hash -1214666672, now seen corresponding path program 29 times [2022-12-14 08:46:03,297 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:46:03,297 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1791473100] [2022-12-14 08:46:03,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:46:03,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:46:03,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:04,031 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 743 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:04,031 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:46:04,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1791473100] [2022-12-14 08:46:04,031 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1791473100] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:46:04,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [785541631] [2022-12-14 08:46:04,031 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:46:04,032 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:04,032 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:46:04,032 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:46:04,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-12-14 08:46:04,114 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2022-12-14 08:46:04,114 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:46:04,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 44 conjunts are in the unsatisfiable core [2022-12-14 08:46:04,119 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:46:04,677 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 800 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:04,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:46:05,127 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 800 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:05,127 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [785541631] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:46:05,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [732699135] [2022-12-14 08:46:05,128 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:46:05,129 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:46:05,129 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:46:05,129 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:46:05,129 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:46:05,201 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:46:05,585 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23376#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:46:05,585 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:46:05,585 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:46:05,585 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 67 [2022-12-14 08:46:05,585 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1495869606] [2022-12-14 08:46:05,585 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:46:05,586 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2022-12-14 08:46:05,586 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:46:05,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2022-12-14 08:46:05,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1085, Invalid=4615, Unknown=0, NotChecked=0, Total=5700 [2022-12-14 08:46:05,587 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:06,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:46:06,016 INFO L93 Difference]: Finished difference Result 283 states and 307 transitions. [2022-12-14 08:46:06,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-12-14 08:46:06,016 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 130 [2022-12-14 08:46:06,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:46:06,016 INFO L225 Difference]: With dead ends: 283 [2022-12-14 08:46:06,016 INFO L226 Difference]: Without dead ends: 196 [2022-12-14 08:46:06,017 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 318 SyntacticMatches, 40 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3586 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2011, Invalid=7301, Unknown=0, NotChecked=0, Total=9312 [2022-12-14 08:46:06,017 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 146 mSDsluCounter, 350 mSDsCounter, 0 mSdLazyCounter, 408 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 146 SdHoareTripleChecker+Valid, 394 SdHoareTripleChecker+Invalid, 471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:46:06,017 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [146 Valid, 394 Invalid, 471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 408 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:46:06,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-12-14 08:46:06,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 133. [2022-12-14 08:46:06,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.0227272727272727) internal successors, (135), 132 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:06,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2022-12-14 08:46:06,036 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 130 [2022-12-14 08:46:06,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:46:06,037 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2022-12-14 08:46:06,037 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:06,037 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2022-12-14 08:46:06,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2022-12-14 08:46:06,038 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:46:06,038 INFO L195 NwaCegarLoop]: trace histogram [22, 21, 21, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:46:06,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-12-14 08:46:06,238 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:06,239 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:46:06,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:46:06,239 INFO L85 PathProgramCache]: Analyzing trace with hash -1764652939, now seen corresponding path program 30 times [2022-12-14 08:46:06,240 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:46:06,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1222355681] [2022-12-14 08:46:06,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:46:06,240 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:46:06,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:06,722 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 420 proven. 842 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:06,722 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:46:06,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1222355681] [2022-12-14 08:46:06,722 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1222355681] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:46:06,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1017442518] [2022-12-14 08:46:06,722 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:46:06,722 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:06,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:46:06,723 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:46:06,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-12-14 08:46:06,789 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:46:06,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:46:06,791 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 48 conjunts are in the unsatisfiable core [2022-12-14 08:46:06,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:46:06,900 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 462 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:06,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:46:07,225 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 462 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:07,226 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1017442518] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:46:07,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1334734772] [2022-12-14 08:46:07,226 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:46:07,226 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:46:07,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:46:07,227 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:46:07,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:46:07,309 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:46:07,609 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24848#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:46:07,609 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:46:07,609 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:46:07,609 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 27 [2022-12-14 08:46:07,609 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729161042] [2022-12-14 08:46:07,609 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:46:07,610 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 08:46:07,610 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:46:07,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 08:46:07,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=352, Invalid=980, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 08:46:07,611 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:07,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:46:07,942 INFO L93 Difference]: Finished difference Result 150 states and 153 transitions. [2022-12-14 08:46:07,942 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-12-14 08:46:07,942 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 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 132 [2022-12-14 08:46:07,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:46:07,943 INFO L225 Difference]: With dead ends: 150 [2022-12-14 08:46:07,943 INFO L226 Difference]: Without dead ends: 148 [2022-12-14 08:46:07,943 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 363 SyntacticMatches, 40 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1568 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1005, Invalid=2655, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 08:46:07,944 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 143 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 196 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:46:07,944 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [143 Valid, 196 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:46:07,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2022-12-14 08:46:07,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 141. [2022-12-14 08:46:07,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 140 states have (on average 1.0214285714285714) internal successors, (143), 140 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:07,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2022-12-14 08:46:07,954 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 132 [2022-12-14 08:46:07,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:46:07,954 INFO L495 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2022-12-14 08:46:07,954 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:07,954 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2022-12-14 08:46:07,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2022-12-14 08:46:07,955 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:46:07,955 INFO L195 NwaCegarLoop]: trace histogram [23, 22, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:46:07,960 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-12-14 08:46:08,155 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2022-12-14 08:46:08,156 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:46:08,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:46:08,157 INFO L85 PathProgramCache]: Analyzing trace with hash -35875493, now seen corresponding path program 31 times [2022-12-14 08:46:08,157 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:46:08,157 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [281383606] [2022-12-14 08:46:08,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:46:08,158 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:46:08,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:08,942 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 905 proven. 525 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:08,943 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:46:08,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [281383606] [2022-12-14 08:46:08,945 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [281383606] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:46:08,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [897348028] [2022-12-14 08:46:08,945 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:46:08,945 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:08,945 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:46:08,946 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:46:08,947 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-12-14 08:46:09,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:09,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 46 conjunts are in the unsatisfiable core [2022-12-14 08:46:09,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:46:09,682 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 966 proven. 462 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:46:09,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:46:10,132 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 966 proven. 462 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:46:10,133 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [897348028] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:46:10,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [567708400] [2022-12-14 08:46:10,133 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:46:10,133 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:46:10,133 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:46:10,134 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:46:10,134 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:46:10,214 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:46:10,715 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26240#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:46:10,715 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:46:10,716 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:46:10,716 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 71 [2022-12-14 08:46:10,716 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [532427978] [2022-12-14 08:46:10,716 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:46:10,716 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2022-12-14 08:46:10,716 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:46:10,717 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2022-12-14 08:46:10,717 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1203, Invalid=5117, Unknown=0, NotChecked=0, Total=6320 [2022-12-14 08:46:10,717 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 71 states, 71 states have (on average 3.323943661971831) internal successors, (236), 71 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:11,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:46:11,265 INFO L93 Difference]: Finished difference Result 302 states and 327 transitions. [2022-12-14 08:46:11,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-12-14 08:46:11,266 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.323943661971831) internal successors, (236), 71 states have internal predecessors, (236), 0 states have call successors, (0), 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 140 [2022-12-14 08:46:11,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:46:11,267 INFO L225 Difference]: With dead ends: 302 [2022-12-14 08:46:11,267 INFO L226 Difference]: Without dead ends: 209 [2022-12-14 08:46:11,268 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 345 SyntacticMatches, 42 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3985 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2217, Invalid=8085, Unknown=0, NotChecked=0, Total=10302 [2022-12-14 08:46:11,268 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 221 mSDsluCounter, 390 mSDsCounter, 0 mSdLazyCounter, 462 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 221 SdHoareTripleChecker+Valid, 436 SdHoareTripleChecker+Invalid, 562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 462 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:46:11,268 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [221 Valid, 436 Invalid, 562 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 462 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:46:11,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2022-12-14 08:46:11,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 143. [2022-12-14 08:46:11,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:11,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2022-12-14 08:46:11,287 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 140 [2022-12-14 08:46:11,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:46:11,287 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2022-12-14 08:46:11,288 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 3.323943661971831) internal successors, (236), 71 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:11,288 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2022-12-14 08:46:11,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2022-12-14 08:46:11,288 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:46:11,289 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:46:11,293 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2022-12-14 08:46:11,489 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-12-14 08:46:11,490 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:46:11,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:46:11,491 INFO L85 PathProgramCache]: Analyzing trace with hash 634014528, now seen corresponding path program 32 times [2022-12-14 08:46:11,491 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:46:11,491 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239901193] [2022-12-14 08:46:11,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:46:11,492 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:46:11,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:12,362 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 905 proven. 569 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:12,362 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:46:12,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239901193] [2022-12-14 08:46:12,362 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [239901193] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:46:12,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [362045716] [2022-12-14 08:46:12,362 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:46:12,362 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:12,362 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:46:12,363 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:46:12,364 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-12-14 08:46:12,454 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2022-12-14 08:46:12,454 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:46:12,456 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 48 conjunts are in the unsatisfiable core [2022-12-14 08:46:12,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:46:13,186 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 968 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:13,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:46:13,773 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 968 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:13,773 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [362045716] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:46:13,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2057573127] [2022-12-14 08:46:13,774 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:46:13,774 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:46:13,774 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:46:13,777 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:46:13,778 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:46:13,848 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:46:14,386 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27862#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:46:14,386 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:46:14,386 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:46:14,387 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 73 [2022-12-14 08:46:14,387 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948909081] [2022-12-14 08:46:14,387 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:46:14,387 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-12-14 08:46:14,387 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:46:14,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-12-14 08:46:14,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=5365, Unknown=0, NotChecked=0, Total=6642 [2022-12-14 08:46:14,388 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 73 states, 73 states have (on average 3.26027397260274) internal successors, (238), 73 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:15,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:46:15,006 INFO L93 Difference]: Finished difference Result 309 states and 335 transitions. [2022-12-14 08:46:15,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-12-14 08:46:15,006 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 3.26027397260274) internal successors, (238), 73 states have internal predecessors, (238), 0 states have call successors, (0), 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 142 [2022-12-14 08:46:15,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:46:15,007 INFO L225 Difference]: With dead ends: 309 [2022-12-14 08:46:15,007 INFO L226 Difference]: Without dead ends: 214 [2022-12-14 08:46:15,008 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 348 SyntacticMatches, 44 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4204 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2383, Invalid=8537, Unknown=0, NotChecked=0, Total=10920 [2022-12-14 08:46:15,008 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 177 mSDsluCounter, 429 mSDsCounter, 0 mSdLazyCounter, 496 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 477 SdHoareTripleChecker+Invalid, 573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 496 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:46:15,008 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [177 Valid, 477 Invalid, 573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 496 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:46:15,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2022-12-14 08:46:15,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 145. [2022-12-14 08:46:15,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:15,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 147 transitions. [2022-12-14 08:46:15,019 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 147 transitions. Word has length 142 [2022-12-14 08:46:15,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:46:15,019 INFO L495 AbstractCegarLoop]: Abstraction has 145 states and 147 transitions. [2022-12-14 08:46:15,019 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 3.26027397260274) internal successors, (238), 73 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:15,019 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 147 transitions. [2022-12-14 08:46:15,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2022-12-14 08:46:15,020 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:46:15,020 INFO L195 NwaCegarLoop]: trace histogram [24, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:46:15,024 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-12-14 08:46:15,220 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:15,221 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:46:15,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:46:15,222 INFO L85 PathProgramCache]: Analyzing trace with hash 153230309, now seen corresponding path program 33 times [2022-12-14 08:46:15,222 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:46:15,222 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [589153799] [2022-12-14 08:46:15,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:46:15,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:46:15,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:15,811 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 506 proven. 1014 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:15,812 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:46:15,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [589153799] [2022-12-14 08:46:15,812 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [589153799] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:46:15,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [851162608] [2022-12-14 08:46:15,812 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:46:15,812 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:15,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:46:15,813 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:46:15,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-12-14 08:46:15,896 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:46:15,896 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:46:15,899 INFO L263 TraceCheckSpWp]: Trace formula consists of 541 conjuncts, 52 conjunts are in the unsatisfiable core [2022-12-14 08:46:15,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:46:16,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 552 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:16,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:46:16,391 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 552 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:16,391 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [851162608] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:46:16,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1869912955] [2022-12-14 08:46:16,392 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:46:16,392 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:46:16,392 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:46:16,392 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:46:16,392 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:46:16,460 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:46:16,725 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29468#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:46:16,726 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:46:16,726 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:46:16,726 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 29 [2022-12-14 08:46:16,726 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663259760] [2022-12-14 08:46:16,726 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:46:16,726 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-12-14 08:46:16,726 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:46:16,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-12-14 08:46:16,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=403, Invalid=1079, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 08:46:16,727 INFO L87 Difference]: Start difference. First operand 145 states and 147 transitions. Second operand has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:16,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:46:16,979 INFO L93 Difference]: Finished difference Result 162 states and 165 transitions. [2022-12-14 08:46:16,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-12-14 08:46:16,980 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 144 [2022-12-14 08:46:16,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:46:16,980 INFO L225 Difference]: With dead ends: 162 [2022-12-14 08:46:16,980 INFO L226 Difference]: Without dead ends: 160 [2022-12-14 08:46:16,981 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 397 SyntacticMatches, 44 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1804 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1162, Invalid=2998, Unknown=0, NotChecked=0, Total=4160 [2022-12-14 08:46:16,981 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 156 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 188 SdHoareTripleChecker+Invalid, 225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:46:16,981 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [156 Valid, 188 Invalid, 225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:46:16,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2022-12-14 08:46:16,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 153. [2022-12-14 08:46:16,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:16,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 155 transitions. [2022-12-14 08:46:16,998 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 155 transitions. Word has length 144 [2022-12-14 08:46:16,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:46:16,998 INFO L495 AbstractCegarLoop]: Abstraction has 153 states and 155 transitions. [2022-12-14 08:46:16,998 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:16,999 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 155 transitions. [2022-12-14 08:46:16,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2022-12-14 08:46:16,999 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:46:16,999 INFO L195 NwaCegarLoop]: trace histogram [25, 24, 24, 24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:46:17,004 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2022-12-14 08:46:17,200 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2022-12-14 08:46:17,201 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:46:17,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:46:17,201 INFO L85 PathProgramCache]: Analyzing trace with hash 1239070923, now seen corresponding path program 34 times [2022-12-14 08:46:17,202 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:46:17,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1728360678] [2022-12-14 08:46:17,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:46:17,203 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:46:17,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:18,165 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1083 proven. 621 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:18,166 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:46:18,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1728360678] [2022-12-14 08:46:18,166 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1728360678] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:46:18,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1025484045] [2022-12-14 08:46:18,166 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:46:18,166 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:18,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:46:18,167 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:46:18,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-12-14 08:46:18,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:18,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 565 conjuncts, 50 conjunts are in the unsatisfiable core [2022-12-14 08:46:18,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:46:19,199 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1150 proven. 552 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:46:19,199 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:46:19,884 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1150 proven. 552 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:46:19,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1025484045] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:46:19,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [883600831] [2022-12-14 08:46:19,885 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:46:19,885 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:46:19,885 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:46:19,886 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:46:19,886 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:46:19,961 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:46:20,493 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30978#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:46:20,493 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:46:20,493 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:46:20,493 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 77 [2022-12-14 08:46:20,493 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1704958747] [2022-12-14 08:46:20,493 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:46:20,494 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2022-12-14 08:46:20,494 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:46:20,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2022-12-14 08:46:20,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1405, Invalid=5905, Unknown=0, NotChecked=0, Total=7310 [2022-12-14 08:46:20,496 INFO L87 Difference]: Start difference. First operand 153 states and 155 transitions. Second operand has 77 states, 77 states have (on average 3.324675324675325) internal successors, (256), 77 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:21,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:46:21,199 INFO L93 Difference]: Finished difference Result 328 states and 355 transitions. [2022-12-14 08:46:21,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2022-12-14 08:46:21,200 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 3.324675324675325) internal successors, (256), 77 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 152 [2022-12-14 08:46:21,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:46:21,201 INFO L225 Difference]: With dead ends: 328 [2022-12-14 08:46:21,201 INFO L226 Difference]: Without dead ends: 227 [2022-12-14 08:46:21,202 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 529 GetRequests, 375 SyntacticMatches, 46 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4635 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=2607, Invalid=9383, Unknown=0, NotChecked=0, Total=11990 [2022-12-14 08:46:21,203 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 166 mSDsluCounter, 591 mSDsCounter, 0 mSdLazyCounter, 666 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 641 SdHoareTripleChecker+Invalid, 737 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 666 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:46:21,203 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [166 Valid, 641 Invalid, 737 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 666 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:46:21,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2022-12-14 08:46:21,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 155. [2022-12-14 08:46:21,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 154 states have (on average 1.0194805194805194) internal successors, (157), 154 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:21,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 157 transitions. [2022-12-14 08:46:21,220 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 157 transitions. Word has length 152 [2022-12-14 08:46:21,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:46:21,220 INFO L495 AbstractCegarLoop]: Abstraction has 155 states and 157 transitions. [2022-12-14 08:46:21,220 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 3.324675324675325) internal successors, (256), 77 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:21,220 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 157 transitions. [2022-12-14 08:46:21,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2022-12-14 08:46:21,220 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:46:21,220 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:46:21,225 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Ended with exit code 0 [2022-12-14 08:46:21,421 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-12-14 08:46:21,421 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:46:21,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:46:21,421 INFO L85 PathProgramCache]: Analyzing trace with hash -183124176, now seen corresponding path program 35 times [2022-12-14 08:46:21,421 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:46:21,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319215499] [2022-12-14 08:46:21,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:46:21,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:46:21,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:22,329 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1083 proven. 669 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:22,329 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:46:22,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319215499] [2022-12-14 08:46:22,330 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [319215499] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:46:22,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [309914402] [2022-12-14 08:46:22,330 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:46:22,330 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:22,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:46:22,330 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:46:22,331 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-12-14 08:46:22,430 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2022-12-14 08:46:22,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:46:22,433 INFO L263 TraceCheckSpWp]: Trace formula consists of 575 conjuncts, 52 conjunts are in the unsatisfiable core [2022-12-14 08:46:22,436 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:46:23,470 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1152 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:23,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:46:24,156 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1152 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:24,156 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [309914402] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:46:24,156 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1843437605] [2022-12-14 08:46:24,157 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:46:24,157 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:46:24,158 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:46:24,158 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:46:24,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:46:24,229 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:46:24,820 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32738#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:46:24,820 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:46:24,820 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:46:24,820 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 79 [2022-12-14 08:46:24,821 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404953082] [2022-12-14 08:46:24,821 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:46:24,821 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2022-12-14 08:46:24,821 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:46:24,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2022-12-14 08:46:24,823 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=6171, Unknown=0, NotChecked=0, Total=7656 [2022-12-14 08:46:24,823 INFO L87 Difference]: Start difference. First operand 155 states and 157 transitions. Second operand has 79 states, 79 states have (on average 3.2658227848101267) internal successors, (258), 79 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:25,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:46:25,622 INFO L93 Difference]: Finished difference Result 335 states and 363 transitions. [2022-12-14 08:46:25,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2022-12-14 08:46:25,623 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 3.2658227848101267) internal successors, (258), 79 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 154 [2022-12-14 08:46:25,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:46:25,624 INFO L225 Difference]: With dead ends: 335 [2022-12-14 08:46:25,624 INFO L226 Difference]: Without dead ends: 232 [2022-12-14 08:46:25,625 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 537 GetRequests, 378 SyntacticMatches, 48 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4870 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2787, Invalid=9869, Unknown=0, NotChecked=0, Total=12656 [2022-12-14 08:46:25,625 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 213 mSDsluCounter, 429 mSDsCounter, 0 mSdLazyCounter, 518 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 213 SdHoareTripleChecker+Valid, 481 SdHoareTripleChecker+Invalid, 614 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 518 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:46:25,626 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [213 Valid, 481 Invalid, 614 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 518 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:46:25,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2022-12-14 08:46:25,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 157. [2022-12-14 08:46:25,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 156 states have (on average 1.0192307692307692) internal successors, (159), 156 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:25,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2022-12-14 08:46:25,638 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 154 [2022-12-14 08:46:25,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:46:25,638 INFO L495 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2022-12-14 08:46:25,638 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 3.2658227848101267) internal successors, (258), 79 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:25,638 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2022-12-14 08:46:25,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2022-12-14 08:46:25,639 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:46:25,639 INFO L195 NwaCegarLoop]: trace histogram [26, 25, 25, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:46:25,643 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-12-14 08:46:25,839 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-12-14 08:46:25,840 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:46:25,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:46:25,841 INFO L85 PathProgramCache]: Analyzing trace with hash -1113014187, now seen corresponding path program 36 times [2022-12-14 08:46:25,841 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:46:25,841 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295612362] [2022-12-14 08:46:25,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:46:25,842 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:46:25,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:26,512 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 600 proven. 1202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:26,512 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:46:26,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295612362] [2022-12-14 08:46:26,512 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [295612362] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:46:26,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1122287326] [2022-12-14 08:46:26,512 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:46:26,512 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:26,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:46:26,513 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:46:26,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-12-14 08:46:26,584 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:46:26,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:46:26,587 INFO L263 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 56 conjunts are in the unsatisfiable core [2022-12-14 08:46:26,588 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:46:26,724 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 650 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:26,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:46:27,161 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 650 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:27,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1122287326] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:46:27,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [973989945] [2022-12-14 08:46:27,162 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:46:27,162 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:46:27,162 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:46:27,162 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:46:27,162 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:46:27,252 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:46:27,568 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34478#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:46:27,568 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:46:27,568 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:46:27,568 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 31 [2022-12-14 08:46:27,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890959404] [2022-12-14 08:46:27,569 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:46:27,569 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-12-14 08:46:27,569 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:46:27,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-12-14 08:46:27,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=458, Invalid=1182, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 08:46:27,570 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:27,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:46:27,990 INFO L93 Difference]: Finished difference Result 174 states and 177 transitions. [2022-12-14 08:46:27,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-12-14 08:46:27,990 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 0 states have call successors, (0), 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 156 [2022-12-14 08:46:27,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:46:27,991 INFO L225 Difference]: With dead ends: 174 [2022-12-14 08:46:27,991 INFO L226 Difference]: Without dead ends: 172 [2022-12-14 08:46:27,991 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 431 SyntacticMatches, 48 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2056 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1331, Invalid=3361, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 08:46:27,992 INFO L413 NwaCegarLoop]: 34 mSDtfsCounter, 170 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 227 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 190 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 227 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:46:27,992 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [170 Valid, 190 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 227 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:46:27,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2022-12-14 08:46:28,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 165. [2022-12-14 08:46:28,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 164 states have (on average 1.0182926829268293) internal successors, (167), 164 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:28,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 167 transitions. [2022-12-14 08:46:28,012 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 167 transitions. Word has length 156 [2022-12-14 08:46:28,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:46:28,012 INFO L495 AbstractCegarLoop]: Abstraction has 165 states and 167 transitions. [2022-12-14 08:46:28,012 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:28,013 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 167 transitions. [2022-12-14 08:46:28,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2022-12-14 08:46:28,013 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:46:28,013 INFO L195 NwaCegarLoop]: trace histogram [27, 26, 26, 26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:46:28,018 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2022-12-14 08:46:28,214 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-12-14 08:46:28,214 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:46:28,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:46:28,214 INFO L85 PathProgramCache]: Analyzing trace with hash -848433861, now seen corresponding path program 37 times [2022-12-14 08:46:28,214 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:46:28,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1136928211] [2022-12-14 08:46:28,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:46:28,215 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:46:28,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:29,285 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1277 proven. 725 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:29,286 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:46:29,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1136928211] [2022-12-14 08:46:29,286 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1136928211] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:46:29,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1489080029] [2022-12-14 08:46:29,286 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:46:29,286 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:29,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:46:29,287 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:46:29,288 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-12-14 08:46:29,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:29,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 609 conjuncts, 54 conjunts are in the unsatisfiable core [2022-12-14 08:46:29,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:46:30,334 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1350 proven. 650 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:46:30,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:46:31,050 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1350 proven. 650 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:46:31,051 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1489080029] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:46:31,051 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1944233736] [2022-12-14 08:46:31,051 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:46:31,052 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:46:31,052 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:46:31,052 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:46:31,052 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:46:31,127 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:46:31,539 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36106#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:46:31,539 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:46:31,539 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:46:31,539 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 83 [2022-12-14 08:46:31,539 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040371781] [2022-12-14 08:46:31,539 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:46:31,539 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2022-12-14 08:46:31,539 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:46:31,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2022-12-14 08:46:31,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1623, Invalid=6749, Unknown=0, NotChecked=0, Total=8372 [2022-12-14 08:46:31,540 INFO L87 Difference]: Start difference. First operand 165 states and 167 transitions. Second operand has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:32,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:46:32,223 INFO L93 Difference]: Finished difference Result 354 states and 383 transitions. [2022-12-14 08:46:32,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-12-14 08:46:32,223 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 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 164 [2022-12-14 08:46:32,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:46:32,224 INFO L225 Difference]: With dead ends: 354 [2022-12-14 08:46:32,224 INFO L226 Difference]: Without dead ends: 245 [2022-12-14 08:46:32,225 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 405 SyntacticMatches, 50 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5333 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3029, Invalid=10777, Unknown=0, NotChecked=0, Total=13806 [2022-12-14 08:46:32,225 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 212 mSDsluCounter, 505 mSDsCounter, 0 mSdLazyCounter, 595 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 559 SdHoareTripleChecker+Invalid, 688 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:46:32,225 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [212 Valid, 559 Invalid, 688 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 595 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:46:32,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2022-12-14 08:46:32,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 167. [2022-12-14 08:46:32,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 166 states have (on average 1.0180722891566265) internal successors, (169), 166 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:32,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 169 transitions. [2022-12-14 08:46:32,239 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 169 transitions. Word has length 164 [2022-12-14 08:46:32,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:46:32,239 INFO L495 AbstractCegarLoop]: Abstraction has 167 states and 169 transitions. [2022-12-14 08:46:32,239 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:32,239 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 169 transitions. [2022-12-14 08:46:32,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2022-12-14 08:46:32,239 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:46:32,239 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:46:32,244 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2022-12-14 08:46:32,440 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-12-14 08:46:32,440 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:46:32,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:46:32,441 INFO L85 PathProgramCache]: Analyzing trace with hash -1543404512, now seen corresponding path program 38 times [2022-12-14 08:46:32,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:46:32,442 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1997201601] [2022-12-14 08:46:32,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:46:32,442 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:46:32,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:33,680 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1277 proven. 777 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:33,680 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:46:33,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1997201601] [2022-12-14 08:46:33,680 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1997201601] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:46:33,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1870431041] [2022-12-14 08:46:33,680 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:46:33,681 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:33,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:46:33,681 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:46:33,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-12-14 08:46:33,783 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2022-12-14 08:46:33,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:46:33,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 619 conjuncts, 56 conjunts are in the unsatisfiable core [2022-12-14 08:46:33,788 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:46:34,678 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1352 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:34,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:46:35,277 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1352 proven. 702 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:35,277 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1870431041] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:46:35,277 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [625080867] [2022-12-14 08:46:35,278 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:46:35,278 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:46:35,278 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:46:35,278 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:46:35,278 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:46:35,351 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:46:35,811 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '38004#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:46:35,811 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:46:35,811 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:46:35,811 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 85 [2022-12-14 08:46:35,812 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521244397] [2022-12-14 08:46:35,812 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:46:35,812 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2022-12-14 08:46:35,812 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:46:35,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2022-12-14 08:46:35,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1709, Invalid=7033, Unknown=0, NotChecked=0, Total=8742 [2022-12-14 08:46:35,814 INFO L87 Difference]: Start difference. First operand 167 states and 169 transitions. Second operand has 85 states, 85 states have (on average 3.2705882352941176) internal successors, (278), 85 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:36,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:46:36,545 INFO L93 Difference]: Finished difference Result 361 states and 391 transitions. [2022-12-14 08:46:36,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2022-12-14 08:46:36,545 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 85 states have (on average 3.2705882352941176) internal successors, (278), 85 states have internal predecessors, (278), 0 states have call successors, (0), 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 166 [2022-12-14 08:46:36,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:46:36,546 INFO L225 Difference]: With dead ends: 361 [2022-12-14 08:46:36,546 INFO L226 Difference]: Without dead ends: 250 [2022-12-14 08:46:36,547 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 579 GetRequests, 408 SyntacticMatches, 52 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5584 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3223, Invalid=11297, Unknown=0, NotChecked=0, Total=14520 [2022-12-14 08:46:36,548 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 250 mSDsluCounter, 484 mSDsCounter, 0 mSdLazyCounter, 570 mSolverCounterSat, 113 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 250 SdHoareTripleChecker+Valid, 540 SdHoareTripleChecker+Invalid, 683 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 113 IncrementalHoareTripleChecker+Valid, 570 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:46:36,548 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [250 Valid, 540 Invalid, 683 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [113 Valid, 570 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:46:36,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2022-12-14 08:46:36,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 169. [2022-12-14 08:46:36,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 168 states have (on average 1.0178571428571428) internal successors, (171), 168 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:36,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 171 transitions. [2022-12-14 08:46:36,564 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 171 transitions. Word has length 166 [2022-12-14 08:46:36,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:46:36,564 INFO L495 AbstractCegarLoop]: Abstraction has 169 states and 171 transitions. [2022-12-14 08:46:36,564 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 85 states have (on average 3.2705882352941176) internal successors, (278), 85 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:36,564 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 171 transitions. [2022-12-14 08:46:36,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2022-12-14 08:46:36,564 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:46:36,564 INFO L195 NwaCegarLoop]: trace histogram [28, 27, 27, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:46:36,569 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-12-14 08:46:36,765 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:36,765 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:46:36,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:46:36,766 INFO L85 PathProgramCache]: Analyzing trace with hash 604698053, now seen corresponding path program 39 times [2022-12-14 08:46:36,766 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:46:36,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343983453] [2022-12-14 08:46:36,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:46:36,767 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:46:36,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:37,504 INFO L134 CoverageAnalysis]: Checked inductivity of 2108 backedges. 702 proven. 1406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:37,504 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:46:37,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343983453] [2022-12-14 08:46:37,504 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343983453] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:46:37,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [11567476] [2022-12-14 08:46:37,504 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:46:37,504 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:37,505 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:46:37,505 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:46:37,506 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-12-14 08:46:37,600 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:46:37,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:46:37,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 629 conjuncts, 60 conjunts are in the unsatisfiable core [2022-12-14 08:46:37,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:46:37,755 INFO L134 CoverageAnalysis]: Checked inductivity of 2108 backedges. 756 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:37,755 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:46:38,329 INFO L134 CoverageAnalysis]: Checked inductivity of 2108 backedges. 756 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:38,330 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [11567476] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:46:38,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1843739532] [2022-12-14 08:46:38,330 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:46:38,331 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:46:38,331 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:46:38,331 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:46:38,331 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:46:38,405 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:46:38,790 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39878#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:46:38,790 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:46:38,790 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:46:38,790 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 33 [2022-12-14 08:46:38,790 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716736633] [2022-12-14 08:46:38,790 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:46:38,791 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-12-14 08:46:38,791 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:46:38,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-12-14 08:46:38,792 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=517, Invalid=1289, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 08:46:38,792 INFO L87 Difference]: Start difference. First operand 169 states and 171 transitions. Second operand has 34 states, 34 states have (on average 5.5588235294117645) internal successors, (189), 33 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:39,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:46:39,293 INFO L93 Difference]: Finished difference Result 186 states and 189 transitions. [2022-12-14 08:46:39,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-12-14 08:46:39,293 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 5.5588235294117645) internal successors, (189), 33 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 168 [2022-12-14 08:46:39,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:46:39,294 INFO L225 Difference]: With dead ends: 186 [2022-12-14 08:46:39,294 INFO L226 Difference]: Without dead ends: 184 [2022-12-14 08:46:39,295 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 588 GetRequests, 465 SyntacticMatches, 52 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2324 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1512, Invalid=3744, Unknown=0, NotChecked=0, Total=5256 [2022-12-14 08:46:39,295 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 99 mSDsluCounter, 215 mSDsCounter, 0 mSdLazyCounter, 290 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 99 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 290 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:46:39,295 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [99 Valid, 251 Invalid, 294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 290 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:46:39,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2022-12-14 08:46:39,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 177. [2022-12-14 08:46:39,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 177 states, 176 states have (on average 1.0170454545454546) internal successors, (179), 176 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:39,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 177 states to 177 states and 179 transitions. [2022-12-14 08:46:39,311 INFO L78 Accepts]: Start accepts. Automaton has 177 states and 179 transitions. Word has length 168 [2022-12-14 08:46:39,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:46:39,311 INFO L495 AbstractCegarLoop]: Abstraction has 177 states and 179 transitions. [2022-12-14 08:46:39,311 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 5.5588235294117645) internal successors, (189), 33 states have internal predecessors, (189), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:39,311 INFO L276 IsEmpty]: Start isEmpty. Operand 177 states and 179 transitions. [2022-12-14 08:46:39,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2022-12-14 08:46:39,312 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:46:39,312 INFO L195 NwaCegarLoop]: trace histogram [29, 28, 28, 28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:46:39,316 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2022-12-14 08:46:39,512 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:39,513 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:46:39,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:46:39,514 INFO L85 PathProgramCache]: Analyzing trace with hash -1162104149, now seen corresponding path program 40 times [2022-12-14 08:46:39,514 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:46:39,514 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2106156543] [2022-12-14 08:46:39,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:46:39,515 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:46:39,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:40,936 INFO L134 CoverageAnalysis]: Checked inductivity of 2324 backedges. 1487 proven. 837 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:40,936 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:46:40,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2106156543] [2022-12-14 08:46:40,936 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2106156543] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:46:40,936 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [846970025] [2022-12-14 08:46:40,936 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:46:40,937 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:40,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:46:40,937 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:46:40,938 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-12-14 08:46:41,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:41,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 653 conjuncts, 58 conjunts are in the unsatisfiable core [2022-12-14 08:46:41,017 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:46:42,331 INFO L134 CoverageAnalysis]: Checked inductivity of 2324 backedges. 1566 proven. 756 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:46:42,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:46:43,249 INFO L134 CoverageAnalysis]: Checked inductivity of 2324 backedges. 1566 proven. 756 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:46:43,249 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [846970025] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:46:43,249 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [283806354] [2022-12-14 08:46:43,250 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:46:43,250 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:46:43,250 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:46:43,250 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:46:43,250 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:46:43,316 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:46:43,882 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41624#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:46:43,882 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:46:43,882 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:46:43,882 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 58] total 89 [2022-12-14 08:46:43,882 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902149855] [2022-12-14 08:46:43,882 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:46:43,882 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 89 states [2022-12-14 08:46:43,883 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:46:43,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 89 interpolants. [2022-12-14 08:46:43,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1857, Invalid=7649, Unknown=0, NotChecked=0, Total=9506 [2022-12-14 08:46:43,884 INFO L87 Difference]: Start difference. First operand 177 states and 179 transitions. Second operand has 89 states, 89 states have (on average 3.3258426966292136) internal successors, (296), 89 states have internal predecessors, (296), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:44,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:46:44,789 INFO L93 Difference]: Finished difference Result 380 states and 411 transitions. [2022-12-14 08:46:44,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2022-12-14 08:46:44,789 INFO L78 Accepts]: Start accepts. Automaton has has 89 states, 89 states have (on average 3.3258426966292136) internal successors, (296), 89 states have internal predecessors, (296), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 176 [2022-12-14 08:46:44,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:46:44,791 INFO L225 Difference]: With dead ends: 380 [2022-12-14 08:46:44,791 INFO L226 Difference]: Without dead ends: 263 [2022-12-14 08:46:44,792 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 613 GetRequests, 435 SyntacticMatches, 54 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6079 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3483, Invalid=12267, Unknown=0, NotChecked=0, Total=15750 [2022-12-14 08:46:44,792 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 204 mSDsluCounter, 593 mSDsCounter, 0 mSdLazyCounter, 685 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 651 SdHoareTripleChecker+Invalid, 773 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 685 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:46:44,793 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [204 Valid, 651 Invalid, 773 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 685 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:46:44,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 263 states. [2022-12-14 08:46:44,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 263 to 179. [2022-12-14 08:46:44,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 178 states have (on average 1.0168539325842696) internal successors, (181), 178 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:44,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 181 transitions. [2022-12-14 08:46:44,821 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 181 transitions. Word has length 176 [2022-12-14 08:46:44,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:46:44,822 INFO L495 AbstractCegarLoop]: Abstraction has 179 states and 181 transitions. [2022-12-14 08:46:44,822 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 89 states, 89 states have (on average 3.3258426966292136) internal successors, (296), 89 states have internal predecessors, (296), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:44,822 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 181 transitions. [2022-12-14 08:46:44,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2022-12-14 08:46:44,823 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:46:44,823 INFO L195 NwaCegarLoop]: trace histogram [29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:46:44,827 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2022-12-14 08:46:45,023 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:45,024 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:46:45,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:46:45,025 INFO L85 PathProgramCache]: Analyzing trace with hash 1842551312, now seen corresponding path program 41 times [2022-12-14 08:46:45,026 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:46:45,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1572681343] [2022-12-14 08:46:45,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:46:45,027 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:46:45,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:46,258 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1487 proven. 893 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:46,258 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:46:46,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1572681343] [2022-12-14 08:46:46,258 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1572681343] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:46:46,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [448687843] [2022-12-14 08:46:46,258 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:46:46,259 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:46,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:46:46,259 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:46:46,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-12-14 08:46:46,419 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2022-12-14 08:46:46,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:46:46,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 60 conjunts are in the unsatisfiable core [2022-12-14 08:46:46,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:46:47,482 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1568 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:47,482 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:46:48,274 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1568 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:48,274 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [448687843] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:46:48,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1262042518] [2022-12-14 08:46:48,275 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:46:48,275 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:46:48,275 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:46:48,275 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:46:48,275 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:46:48,345 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:46:48,831 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '43660#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:46:48,831 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:46:48,831 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:46:48,831 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 91 [2022-12-14 08:46:48,831 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [483685930] [2022-12-14 08:46:48,831 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:46:48,832 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2022-12-14 08:46:48,832 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:46:48,833 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2022-12-14 08:46:48,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1949, Invalid=7951, Unknown=0, NotChecked=0, Total=9900 [2022-12-14 08:46:48,834 INFO L87 Difference]: Start difference. First operand 179 states and 181 transitions. Second operand has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:49,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:46:49,880 INFO L93 Difference]: Finished difference Result 387 states and 419 transitions. [2022-12-14 08:46:49,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2022-12-14 08:46:49,881 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 178 [2022-12-14 08:46:49,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:46:49,882 INFO L225 Difference]: With dead ends: 387 [2022-12-14 08:46:49,882 INFO L226 Difference]: Without dead ends: 268 [2022-12-14 08:46:49,883 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 621 GetRequests, 438 SyntacticMatches, 56 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6346 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=3691, Invalid=12821, Unknown=0, NotChecked=0, Total=16512 [2022-12-14 08:46:49,884 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 247 mSDsluCounter, 703 mSDsCounter, 0 mSdLazyCounter, 800 mSolverCounterSat, 111 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 247 SdHoareTripleChecker+Valid, 763 SdHoareTripleChecker+Invalid, 911 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 111 IncrementalHoareTripleChecker+Valid, 800 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:46:49,884 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [247 Valid, 763 Invalid, 911 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [111 Valid, 800 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:46:49,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2022-12-14 08:46:49,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 181. [2022-12-14 08:46:49,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 180 states have (on average 1.0166666666666666) internal successors, (183), 180 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:49,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 183 transitions. [2022-12-14 08:46:49,904 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 183 transitions. Word has length 178 [2022-12-14 08:46:49,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:46:49,904 INFO L495 AbstractCegarLoop]: Abstraction has 181 states and 183 transitions. [2022-12-14 08:46:49,904 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:49,904 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 183 transitions. [2022-12-14 08:46:49,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2022-12-14 08:46:49,905 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:46:49,905 INFO L195 NwaCegarLoop]: trace histogram [30, 29, 29, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:46:49,909 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2022-12-14 08:46:50,105 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2022-12-14 08:46:50,105 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:46:50,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:46:50,105 INFO L85 PathProgramCache]: Analyzing trace with hash -1196540875, now seen corresponding path program 42 times [2022-12-14 08:46:50,105 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:46:50,106 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [658005026] [2022-12-14 08:46:50,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:46:50,106 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:46:50,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:51,069 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 812 proven. 1626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:51,069 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:46:51,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [658005026] [2022-12-14 08:46:51,069 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [658005026] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:46:51,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1505972851] [2022-12-14 08:46:51,069 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:46:51,070 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:51,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:46:51,070 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:46:51,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-12-14 08:46:51,145 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:46:51,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:46:51,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 673 conjuncts, 64 conjunts are in the unsatisfiable core [2022-12-14 08:46:51,150 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:46:51,319 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 870 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:51,320 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:46:51,777 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 870 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:51,777 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1505972851] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:46:51,777 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1268981602] [2022-12-14 08:46:51,777 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:46:51,777 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:46:51,778 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:46:51,778 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:46:51,778 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:46:51,856 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:46:52,128 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '45668#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:46:52,128 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:46:52,128 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:46:52,129 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 35 [2022-12-14 08:46:52,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053446285] [2022-12-14 08:46:52,129 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:46:52,129 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-12-14 08:46:52,129 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:46:52,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-12-14 08:46:52,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=580, Invalid=1400, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 08:46:52,130 INFO L87 Difference]: Start difference. First operand 181 states and 183 transitions. Second operand has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:52,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:46:52,541 INFO L93 Difference]: Finished difference Result 198 states and 201 transitions. [2022-12-14 08:46:52,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-12-14 08:46:52,542 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 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 180 [2022-12-14 08:46:52,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:46:52,543 INFO L225 Difference]: With dead ends: 198 [2022-12-14 08:46:52,543 INFO L226 Difference]: Without dead ends: 196 [2022-12-14 08:46:52,543 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 630 GetRequests, 499 SyntacticMatches, 56 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2608 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1705, Invalid=4147, Unknown=0, NotChecked=0, Total=5852 [2022-12-14 08:46:52,544 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 195 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 283 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 283 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:46:52,544 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [195 Valid, 242 Invalid, 287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 283 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:46:52,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2022-12-14 08:46:52,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 189. [2022-12-14 08:46:52,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 1.0159574468085106) internal successors, (191), 188 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:52,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 191 transitions. [2022-12-14 08:46:52,561 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 191 transitions. Word has length 180 [2022-12-14 08:46:52,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:46:52,561 INFO L495 AbstractCegarLoop]: Abstraction has 189 states and 191 transitions. [2022-12-14 08:46:52,561 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:52,561 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 191 transitions. [2022-12-14 08:46:52,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2022-12-14 08:46:52,562 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:46:52,562 INFO L195 NwaCegarLoop]: trace histogram [31, 30, 30, 30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:46:52,566 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2022-12-14 08:46:52,762 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-12-14 08:46:52,763 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:46:52,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:46:52,764 INFO L85 PathProgramCache]: Analyzing trace with hash -1867937509, now seen corresponding path program 43 times [2022-12-14 08:46:52,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:46:52,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1845549662] [2022-12-14 08:46:52,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:46:52,765 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:46:52,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:54,297 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1713 proven. 957 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:54,297 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:46:54,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1845549662] [2022-12-14 08:46:54,298 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1845549662] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:46:54,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1133852590] [2022-12-14 08:46:54,298 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:46:54,298 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:54,298 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:46:54,299 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:46:54,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-12-14 08:46:54,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:54,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 697 conjuncts, 62 conjunts are in the unsatisfiable core [2022-12-14 08:46:54,377 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:46:55,746 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1798 proven. 870 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:46:55,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:46:56,717 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1798 proven. 870 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:46:56,718 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1133852590] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:46:56,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [484425794] [2022-12-14 08:46:56,718 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:46:56,718 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:46:56,718 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:46:56,718 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:46:56,719 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:46:56,786 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:46:57,223 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47532#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:46:57,223 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:46:57,223 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:46:57,224 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 62, 62] total 95 [2022-12-14 08:46:57,224 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129372724] [2022-12-14 08:46:57,224 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:46:57,224 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 95 states [2022-12-14 08:46:57,224 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:46:57,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 95 interpolants. [2022-12-14 08:46:57,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2107, Invalid=8605, Unknown=0, NotChecked=0, Total=10712 [2022-12-14 08:46:57,225 INFO L87 Difference]: Start difference. First operand 189 states and 191 transitions. Second operand has 95 states, 95 states have (on average 3.3263157894736843) internal successors, (316), 95 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:58,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:46:58,126 INFO L93 Difference]: Finished difference Result 406 states and 439 transitions. [2022-12-14 08:46:58,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2022-12-14 08:46:58,126 INFO L78 Accepts]: Start accepts. Automaton has has 95 states, 95 states have (on average 3.3263157894736843) internal successors, (316), 95 states have internal predecessors, (316), 0 states have call successors, (0), 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 188 [2022-12-14 08:46:58,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:46:58,127 INFO L225 Difference]: With dead ends: 406 [2022-12-14 08:46:58,127 INFO L226 Difference]: Without dead ends: 281 [2022-12-14 08:46:58,128 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 655 GetRequests, 465 SyntacticMatches, 58 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6873 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=3969, Invalid=13853, Unknown=0, NotChecked=0, Total=17822 [2022-12-14 08:46:58,128 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 267 mSDsluCounter, 582 mSDsCounter, 0 mSdLazyCounter, 679 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 267 SdHoareTripleChecker+Valid, 644 SdHoareTripleChecker+Invalid, 799 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 679 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:46:58,128 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [267 Valid, 644 Invalid, 799 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 679 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:46:58,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 281 states. [2022-12-14 08:46:58,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 281 to 191. [2022-12-14 08:46:58,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 190 states have (on average 1.0157894736842106) internal successors, (193), 190 states have internal predecessors, (193), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:58,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 193 transitions. [2022-12-14 08:46:58,152 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 193 transitions. Word has length 188 [2022-12-14 08:46:58,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:46:58,152 INFO L495 AbstractCegarLoop]: Abstraction has 191 states and 193 transitions. [2022-12-14 08:46:58,152 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 95 states, 95 states have (on average 3.3263157894736843) internal successors, (316), 95 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:46:58,152 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 193 transitions. [2022-12-14 08:46:58,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2022-12-14 08:46:58,153 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:46:58,153 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:46:58,157 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Ended with exit code 0 [2022-12-14 08:46:58,353 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:58,354 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:46:58,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:46:58,355 INFO L85 PathProgramCache]: Analyzing trace with hash 714080512, now seen corresponding path program 44 times [2022-12-14 08:46:58,355 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:46:58,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184502366] [2022-12-14 08:46:58,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:46:58,356 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:46:58,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:46:59,898 INFO L134 CoverageAnalysis]: Checked inductivity of 2730 backedges. 1713 proven. 1017 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:46:59,898 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:46:59,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184502366] [2022-12-14 08:46:59,898 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184502366] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:46:59,898 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106383174] [2022-12-14 08:46:59,898 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:46:59,898 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:46:59,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:46:59,899 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:46:59,900 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-12-14 08:47:00,035 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 31 check-sat command(s) [2022-12-14 08:47:00,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:47:00,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 707 conjuncts, 64 conjunts are in the unsatisfiable core [2022-12-14 08:47:00,040 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:47:01,303 INFO L134 CoverageAnalysis]: Checked inductivity of 2730 backedges. 1800 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:01,303 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:47:02,261 INFO L134 CoverageAnalysis]: Checked inductivity of 2730 backedges. 1800 proven. 930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:02,261 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2106383174] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:47:02,261 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [38311313] [2022-12-14 08:47:02,262 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:47:02,262 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:47:02,262 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:47:02,262 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:47:02,262 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:47:02,324 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:47:02,909 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '49706#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:47:02,909 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:47:02,909 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:47:02,909 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 97 [2022-12-14 08:47:02,909 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944088034] [2022-12-14 08:47:02,910 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:47:02,910 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2022-12-14 08:47:02,910 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:47:02,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2022-12-14 08:47:02,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2205, Invalid=8925, Unknown=0, NotChecked=0, Total=11130 [2022-12-14 08:47:02,912 INFO L87 Difference]: Start difference. First operand 191 states and 193 transitions. Second operand has 97 states, 97 states have (on average 3.2783505154639174) internal successors, (318), 97 states have internal predecessors, (318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:03,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:47:03,745 INFO L93 Difference]: Finished difference Result 413 states and 447 transitions. [2022-12-14 08:47:03,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2022-12-14 08:47:03,745 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 3.2783505154639174) internal successors, (318), 97 states have internal predecessors, (318), 0 states have call successors, (0), 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 190 [2022-12-14 08:47:03,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:47:03,746 INFO L225 Difference]: With dead ends: 413 [2022-12-14 08:47:03,746 INFO L226 Difference]: Without dead ends: 286 [2022-12-14 08:47:03,747 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 663 GetRequests, 468 SyntacticMatches, 60 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7156 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4191, Invalid=14441, Unknown=0, NotChecked=0, Total=18632 [2022-12-14 08:47:03,747 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 267 mSDsluCounter, 599 mSDsCounter, 0 mSdLazyCounter, 699 mSolverCounterSat, 120 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 267 SdHoareTripleChecker+Valid, 663 SdHoareTripleChecker+Invalid, 819 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 120 IncrementalHoareTripleChecker+Valid, 699 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:47:03,747 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [267 Valid, 663 Invalid, 819 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [120 Valid, 699 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:47:03,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2022-12-14 08:47:03,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 193. [2022-12-14 08:47:03,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 192 states have (on average 1.015625) internal successors, (195), 192 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:03,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 195 transitions. [2022-12-14 08:47:03,765 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 195 transitions. Word has length 190 [2022-12-14 08:47:03,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:47:03,765 INFO L495 AbstractCegarLoop]: Abstraction has 193 states and 195 transitions. [2022-12-14 08:47:03,765 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 3.2783505154639174) internal successors, (318), 97 states have internal predecessors, (318), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:03,765 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 195 transitions. [2022-12-14 08:47:03,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2022-12-14 08:47:03,766 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:47:03,766 INFO L195 NwaCegarLoop]: trace histogram [32, 31, 31, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:47:03,771 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2022-12-14 08:47:03,966 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2022-12-14 08:47:03,967 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:47:03,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:47:03,968 INFO L85 PathProgramCache]: Analyzing trace with hash -457698395, now seen corresponding path program 45 times [2022-12-14 08:47:03,968 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:47:03,968 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1982278265] [2022-12-14 08:47:03,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:03,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:47:04,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:04,955 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 930 proven. 1862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:04,955 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:47:04,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1982278265] [2022-12-14 08:47:04,955 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1982278265] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:47:04,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2035637161] [2022-12-14 08:47:04,955 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:47:04,955 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:04,956 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:47:04,956 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:47:04,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-12-14 08:47:05,047 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:47:05,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:47:05,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 68 conjunts are in the unsatisfiable core [2022-12-14 08:47:05,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:47:05,182 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 992 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:05,183 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:47:05,741 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 992 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:05,741 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2035637161] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:47:05,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1066820142] [2022-12-14 08:47:05,741 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:47:05,741 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:47:05,742 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:47:05,742 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:47:05,742 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:47:05,810 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:47:06,115 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '51848#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:47:06,115 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:47:06,115 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:47:06,116 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 37 [2022-12-14 08:47:06,116 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305699180] [2022-12-14 08:47:06,116 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:47:06,116 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-12-14 08:47:06,117 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:47:06,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-12-14 08:47:06,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=647, Invalid=1515, Unknown=0, NotChecked=0, Total=2162 [2022-12-14 08:47:06,117 INFO L87 Difference]: Start difference. First operand 193 states and 195 transitions. Second operand has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:06,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:47:06,549 INFO L93 Difference]: Finished difference Result 210 states and 213 transitions. [2022-12-14 08:47:06,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-12-14 08:47:06,550 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 192 [2022-12-14 08:47:06,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:47:06,551 INFO L225 Difference]: With dead ends: 210 [2022-12-14 08:47:06,551 INFO L226 Difference]: Without dead ends: 208 [2022-12-14 08:47:06,552 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 672 GetRequests, 533 SyntacticMatches, 60 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2908 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1910, Invalid=4570, Unknown=0, NotChecked=0, Total=6480 [2022-12-14 08:47:06,552 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 204 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 296 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 245 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:47:06,552 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [204 Valid, 245 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 296 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:47:06,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2022-12-14 08:47:06,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 201. [2022-12-14 08:47:06,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 200 states have (on average 1.015) internal successors, (203), 200 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:06,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 203 transitions. [2022-12-14 08:47:06,580 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 203 transitions. Word has length 192 [2022-12-14 08:47:06,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:47:06,580 INFO L495 AbstractCegarLoop]: Abstraction has 201 states and 203 transitions. [2022-12-14 08:47:06,580 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:06,580 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 203 transitions. [2022-12-14 08:47:06,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2022-12-14 08:47:06,581 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:47:06,581 INFO L195 NwaCegarLoop]: trace histogram [33, 32, 32, 32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:47:06,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Forceful destruction successful, exit code 0 [2022-12-14 08:47:06,781 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-12-14 08:47:06,782 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:47:06,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:47:06,783 INFO L85 PathProgramCache]: Analyzing trace with hash -86183797, now seen corresponding path program 46 times [2022-12-14 08:47:06,783 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:47:06,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080131788] [2022-12-14 08:47:06,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:06,784 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:47:06,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:08,480 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 1955 proven. 1085 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:08,480 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:47:08,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080131788] [2022-12-14 08:47:08,480 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2080131788] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:47:08,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [748730233] [2022-12-14 08:47:08,481 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:47:08,481 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:08,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:47:08,481 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:47:08,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-12-14 08:47:08,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:08,570 INFO L263 TraceCheckSpWp]: Trace formula consists of 741 conjuncts, 66 conjunts are in the unsatisfiable core [2022-12-14 08:47:08,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:47:09,866 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 2046 proven. 992 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:47:09,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:47:10,885 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 2046 proven. 992 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:47:10,885 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [748730233] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:47:10,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [256471505] [2022-12-14 08:47:10,886 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:47:10,886 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:47:10,886 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:47:10,886 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:47:10,886 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:47:10,964 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:47:11,425 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '53830#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:47:11,425 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:47:11,425 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:47:11,425 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 66, 66] total 101 [2022-12-14 08:47:11,426 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [845339874] [2022-12-14 08:47:11,426 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:47:11,426 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2022-12-14 08:47:11,426 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:47:11,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2022-12-14 08:47:11,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2373, Invalid=9617, Unknown=0, NotChecked=0, Total=11990 [2022-12-14 08:47:11,428 INFO L87 Difference]: Start difference. First operand 201 states and 203 transitions. Second operand has 101 states, 101 states have (on average 3.3267326732673266) internal successors, (336), 101 states have internal predecessors, (336), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:12,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:47:12,522 INFO L93 Difference]: Finished difference Result 432 states and 467 transitions. [2022-12-14 08:47:12,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2022-12-14 08:47:12,523 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 3.3267326732673266) internal successors, (336), 101 states have internal predecessors, (336), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 200 [2022-12-14 08:47:12,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:47:12,524 INFO L225 Difference]: With dead ends: 432 [2022-12-14 08:47:12,524 INFO L226 Difference]: Without dead ends: 299 [2022-12-14 08:47:12,525 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 697 GetRequests, 495 SyntacticMatches, 62 SemanticMatches, 140 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7715 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=4487, Invalid=15535, Unknown=0, NotChecked=0, Total=20022 [2022-12-14 08:47:12,526 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 326 mSDsluCounter, 729 mSDsCounter, 0 mSdLazyCounter, 842 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 326 SdHoareTripleChecker+Valid, 795 SdHoareTripleChecker+Invalid, 991 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 842 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:47:12,526 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [326 Valid, 795 Invalid, 991 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 842 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:47:12,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2022-12-14 08:47:12,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 203. [2022-12-14 08:47:12,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 202 states have (on average 1.0148514851485149) internal successors, (205), 202 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:12,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 205 transitions. [2022-12-14 08:47:12,547 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 205 transitions. Word has length 200 [2022-12-14 08:47:12,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:47:12,547 INFO L495 AbstractCegarLoop]: Abstraction has 203 states and 205 transitions. [2022-12-14 08:47:12,547 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 3.3267326732673266) internal successors, (336), 101 states have internal predecessors, (336), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:12,547 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 205 transitions. [2022-12-14 08:47:12,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2022-12-14 08:47:12,548 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:47:12,548 INFO L195 NwaCegarLoop]: trace histogram [33, 33, 32, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:47:12,552 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2022-12-14 08:47:12,748 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-12-14 08:47:12,749 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:47:12,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:47:12,749 INFO L85 PathProgramCache]: Analyzing trace with hash 788379888, now seen corresponding path program 47 times [2022-12-14 08:47:12,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:47:12,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1264342135] [2022-12-14 08:47:12,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:12,750 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:47:12,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:14,551 INFO L134 CoverageAnalysis]: Checked inductivity of 3104 backedges. 1955 proven. 1149 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:14,551 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:47:14,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1264342135] [2022-12-14 08:47:14,551 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1264342135] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:47:14,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390772280] [2022-12-14 08:47:14,551 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:47:14,551 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:14,551 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:47:14,552 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:47:14,553 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-12-14 08:47:14,714 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2022-12-14 08:47:14,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:47:14,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 751 conjuncts, 68 conjunts are in the unsatisfiable core [2022-12-14 08:47:14,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:47:15,962 INFO L134 CoverageAnalysis]: Checked inductivity of 3104 backedges. 2048 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:15,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:47:16,865 INFO L134 CoverageAnalysis]: Checked inductivity of 3104 backedges. 2048 proven. 1056 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:16,865 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390772280] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:47:16,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [438136238] [2022-12-14 08:47:16,866 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:47:16,866 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:47:16,866 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:47:16,867 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:47:16,867 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:47:16,959 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:47:17,507 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '56142#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:47:17,507 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:47:17,507 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:47:17,507 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 103 [2022-12-14 08:47:17,508 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776462283] [2022-12-14 08:47:17,508 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:47:17,508 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2022-12-14 08:47:17,508 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:47:17,510 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2022-12-14 08:47:17,510 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2477, Invalid=9955, Unknown=0, NotChecked=0, Total=12432 [2022-12-14 08:47:17,510 INFO L87 Difference]: Start difference. First operand 203 states and 205 transitions. Second operand has 103 states, 103 states have (on average 3.2815533980582523) internal successors, (338), 103 states have internal predecessors, (338), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:18,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:47:18,630 INFO L93 Difference]: Finished difference Result 439 states and 475 transitions. [2022-12-14 08:47:18,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2022-12-14 08:47:18,630 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 3.2815533980582523) internal successors, (338), 103 states have internal predecessors, (338), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 202 [2022-12-14 08:47:18,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:47:18,631 INFO L225 Difference]: With dead ends: 439 [2022-12-14 08:47:18,631 INFO L226 Difference]: Without dead ends: 304 [2022-12-14 08:47:18,632 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 705 GetRequests, 498 SyntacticMatches, 64 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8014 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=4723, Invalid=16157, Unknown=0, NotChecked=0, Total=20880 [2022-12-14 08:47:18,632 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 300 mSDsluCounter, 614 mSDsCounter, 0 mSdLazyCounter, 708 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 682 SdHoareTripleChecker+Invalid, 842 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 708 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:47:18,632 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [300 Valid, 682 Invalid, 842 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 708 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:47:18,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2022-12-14 08:47:18,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 205. [2022-12-14 08:47:18,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 204 states have (on average 1.0147058823529411) internal successors, (207), 204 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:18,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 207 transitions. [2022-12-14 08:47:18,652 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 207 transitions. Word has length 202 [2022-12-14 08:47:18,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:47:18,652 INFO L495 AbstractCegarLoop]: Abstraction has 205 states and 207 transitions. [2022-12-14 08:47:18,652 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 3.2815533980582523) internal successors, (338), 103 states have internal predecessors, (338), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:18,653 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 207 transitions. [2022-12-14 08:47:18,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2022-12-14 08:47:18,653 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:47:18,653 INFO L195 NwaCegarLoop]: trace histogram [34, 33, 33, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:47:18,658 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2022-12-14 08:47:18,853 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-12-14 08:47:18,854 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:47:18,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:47:18,855 INFO L85 PathProgramCache]: Analyzing trace with hash -569508843, now seen corresponding path program 48 times [2022-12-14 08:47:18,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:47:18,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1255953845] [2022-12-14 08:47:18,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:18,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:47:18,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:19,980 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1056 proven. 2114 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:19,980 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:47:19,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1255953845] [2022-12-14 08:47:19,980 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1255953845] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:47:19,981 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1425472286] [2022-12-14 08:47:19,981 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:47:19,981 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:19,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:47:19,982 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:47:19,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-12-14 08:47:20,065 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:47:20,065 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:47:20,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 761 conjuncts, 72 conjunts are in the unsatisfiable core [2022-12-14 08:47:20,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:47:20,235 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1122 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:20,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:47:20,985 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1122 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:20,985 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1425472286] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:47:20,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [745553814] [2022-12-14 08:47:20,986 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:47:20,986 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:47:20,986 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:47:20,986 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:47:20,986 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:47:21,059 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:47:21,474 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '58418#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:47:21,474 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:47:21,474 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:47:21,474 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 39 [2022-12-14 08:47:21,474 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452727824] [2022-12-14 08:47:21,474 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:47:21,475 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-12-14 08:47:21,475 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:47:21,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-12-14 08:47:21,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=718, Invalid=1634, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 08:47:21,476 INFO L87 Difference]: Start difference. First operand 205 states and 207 transitions. Second operand has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:22,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:47:22,149 INFO L93 Difference]: Finished difference Result 222 states and 225 transitions. [2022-12-14 08:47:22,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-12-14 08:47:22,149 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 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 204 [2022-12-14 08:47:22,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:47:22,149 INFO L225 Difference]: With dead ends: 222 [2022-12-14 08:47:22,149 INFO L226 Difference]: Without dead ends: 220 [2022-12-14 08:47:22,150 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 714 GetRequests, 567 SyntacticMatches, 64 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3224 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2127, Invalid=5013, Unknown=0, NotChecked=0, Total=7140 [2022-12-14 08:47:22,150 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 114 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 365 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 369 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:47:22,150 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 322 Invalid, 369 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 365 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:47:22,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2022-12-14 08:47:22,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 213. [2022-12-14 08:47:22,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 212 states have (on average 1.0141509433962264) internal successors, (215), 212 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:22,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 215 transitions. [2022-12-14 08:47:22,177 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 215 transitions. Word has length 204 [2022-12-14 08:47:22,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:47:22,177 INFO L495 AbstractCegarLoop]: Abstraction has 213 states and 215 transitions. [2022-12-14 08:47:22,177 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:22,177 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 215 transitions. [2022-12-14 08:47:22,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2022-12-14 08:47:22,178 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:47:22,178 INFO L195 NwaCegarLoop]: trace histogram [35, 34, 34, 34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:47:22,183 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2022-12-14 08:47:22,379 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:22,380 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:47:22,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:47:22,381 INFO L85 PathProgramCache]: Analyzing trace with hash -1313117957, now seen corresponding path program 49 times [2022-12-14 08:47:22,381 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:47:22,381 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2086389866] [2022-12-14 08:47:22,382 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:22,382 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:47:22,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:24,195 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2213 proven. 1221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:24,195 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:47:24,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2086389866] [2022-12-14 08:47:24,195 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2086389866] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:47:24,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [100845668] [2022-12-14 08:47:24,195 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:47:24,195 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:24,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:47:24,196 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:47:24,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-12-14 08:47:24,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:24,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 785 conjuncts, 70 conjunts are in the unsatisfiable core [2022-12-14 08:47:24,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:47:25,713 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2310 proven. 1122 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:47:25,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:47:26,601 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2310 proven. 1122 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:47:26,601 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [100845668] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:47:26,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1182077409] [2022-12-14 08:47:26,602 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:47:26,602 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:47:26,602 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:47:26,602 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:47:26,602 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:47:26,680 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:47:27,211 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '60518#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:47:27,211 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:47:27,211 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:47:27,211 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70, 70] total 107 [2022-12-14 08:47:27,211 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232734499] [2022-12-14 08:47:27,212 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:47:27,212 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2022-12-14 08:47:27,212 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:47:27,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2022-12-14 08:47:27,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2655, Invalid=10685, Unknown=0, NotChecked=0, Total=13340 [2022-12-14 08:47:27,213 INFO L87 Difference]: Start difference. First operand 213 states and 215 transitions. Second operand has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:28,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:47:28,363 INFO L93 Difference]: Finished difference Result 458 states and 495 transitions. [2022-12-14 08:47:28,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2022-12-14 08:47:28,364 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 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 212 [2022-12-14 08:47:28,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:47:28,365 INFO L225 Difference]: With dead ends: 458 [2022-12-14 08:47:28,365 INFO L226 Difference]: Without dead ends: 317 [2022-12-14 08:47:28,367 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 739 GetRequests, 525 SyntacticMatches, 66 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8605 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=5037, Invalid=17313, Unknown=0, NotChecked=0, Total=22350 [2022-12-14 08:47:28,371 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 296 mSDsluCounter, 781 mSDsCounter, 0 mSdLazyCounter, 905 mSolverCounterSat, 133 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 851 SdHoareTripleChecker+Invalid, 1038 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 133 IncrementalHoareTripleChecker+Valid, 905 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:47:28,371 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [296 Valid, 851 Invalid, 1038 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [133 Valid, 905 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:47:28,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2022-12-14 08:47:28,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 215. [2022-12-14 08:47:28,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 214 states have (on average 1.014018691588785) internal successors, (217), 214 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:28,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 217 transitions. [2022-12-14 08:47:28,394 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 217 transitions. Word has length 212 [2022-12-14 08:47:28,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:47:28,394 INFO L495 AbstractCegarLoop]: Abstraction has 215 states and 217 transitions. [2022-12-14 08:47:28,394 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:28,394 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 217 transitions. [2022-12-14 08:47:28,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2022-12-14 08:47:28,395 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:47:28,395 INFO L195 NwaCegarLoop]: trace histogram [35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:47:28,400 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2022-12-14 08:47:28,596 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:28,596 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:47:28,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:47:28,597 INFO L85 PathProgramCache]: Analyzing trace with hash 748798432, now seen corresponding path program 50 times [2022-12-14 08:47:28,598 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:47:28,598 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [870283658] [2022-12-14 08:47:28,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:28,598 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:47:28,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:30,522 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2213 proven. 1289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:30,522 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:47:30,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [870283658] [2022-12-14 08:47:30,522 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [870283658] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:47:30,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [969112260] [2022-12-14 08:47:30,523 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:47:30,523 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:30,523 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:47:30,523 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:47:30,524 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-12-14 08:47:30,669 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2022-12-14 08:47:30,669 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:47:30,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 795 conjuncts, 72 conjunts are in the unsatisfiable core [2022-12-14 08:47:30,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:47:32,269 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2312 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:32,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:47:33,316 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2312 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:33,317 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [969112260] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:47:33,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1994165982] [2022-12-14 08:47:33,317 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:47:33,317 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:47:33,317 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:47:33,318 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:47:33,318 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:47:33,388 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:47:33,925 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62968#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:47:33,925 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:47:33,925 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:47:33,925 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 109 [2022-12-14 08:47:33,925 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806133306] [2022-12-14 08:47:33,925 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:47:33,926 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2022-12-14 08:47:33,926 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:47:33,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2022-12-14 08:47:33,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2765, Invalid=11041, Unknown=0, NotChecked=0, Total=13806 [2022-12-14 08:47:33,927 INFO L87 Difference]: Start difference. First operand 215 states and 217 transitions. Second operand has 109 states, 109 states have (on average 3.2844036697247705) internal successors, (358), 109 states have internal predecessors, (358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:35,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:47:35,199 INFO L93 Difference]: Finished difference Result 465 states and 503 transitions. [2022-12-14 08:47:35,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2022-12-14 08:47:35,199 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 3.2844036697247705) internal successors, (358), 109 states have internal predecessors, (358), 0 states have call successors, (0), 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 214 [2022-12-14 08:47:35,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:47:35,201 INFO L225 Difference]: With dead ends: 465 [2022-12-14 08:47:35,201 INFO L226 Difference]: Without dead ends: 322 [2022-12-14 08:47:35,203 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 747 GetRequests, 528 SyntacticMatches, 68 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8920 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=5287, Invalid=17969, Unknown=0, NotChecked=0, Total=23256 [2022-12-14 08:47:35,203 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 317 mSDsluCounter, 719 mSDsCounter, 0 mSdLazyCounter, 831 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 317 SdHoareTripleChecker+Valid, 791 SdHoareTripleChecker+Invalid, 972 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 831 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:47:35,203 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [317 Valid, 791 Invalid, 972 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 831 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:47:35,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2022-12-14 08:47:35,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 217. [2022-12-14 08:47:35,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 216 states have (on average 1.0138888888888888) internal successors, (219), 216 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:35,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 219 transitions. [2022-12-14 08:47:35,238 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 219 transitions. Word has length 214 [2022-12-14 08:47:35,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:47:35,238 INFO L495 AbstractCegarLoop]: Abstraction has 217 states and 219 transitions. [2022-12-14 08:47:35,238 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 3.2844036697247705) internal successors, (358), 109 states have internal predecessors, (358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:35,238 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 219 transitions. [2022-12-14 08:47:35,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2022-12-14 08:47:35,238 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:47:35,239 INFO L195 NwaCegarLoop]: trace histogram [36, 35, 35, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:47:35,244 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2022-12-14 08:47:35,439 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:35,440 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:47:35,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:47:35,441 INFO L85 PathProgramCache]: Analyzing trace with hash -2024442491, now seen corresponding path program 51 times [2022-12-14 08:47:35,441 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:47:35,441 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377951357] [2022-12-14 08:47:35,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:35,442 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:47:35,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:36,781 INFO L134 CoverageAnalysis]: Checked inductivity of 3572 backedges. 1190 proven. 2382 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:36,781 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:47:36,781 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [377951357] [2022-12-14 08:47:36,781 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [377951357] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:47:36,782 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [440922337] [2022-12-14 08:47:36,782 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:47:36,782 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:36,782 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:47:36,783 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:47:36,783 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-12-14 08:47:36,884 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:47:36,884 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:47:36,887 INFO L263 TraceCheckSpWp]: Trace formula consists of 805 conjuncts, 76 conjunts are in the unsatisfiable core [2022-12-14 08:47:36,889 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:47:37,085 INFO L134 CoverageAnalysis]: Checked inductivity of 3572 backedges. 1260 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:37,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:47:37,772 INFO L134 CoverageAnalysis]: Checked inductivity of 3572 backedges. 1260 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:37,773 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [440922337] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:47:37,773 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1131251582] [2022-12-14 08:47:37,774 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:47:37,774 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:47:37,774 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:47:37,774 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:47:37,774 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:47:37,845 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:47:38,180 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '65378#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:47:38,180 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:47:38,180 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:47:38,180 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 41 [2022-12-14 08:47:38,180 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668362350] [2022-12-14 08:47:38,180 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:47:38,180 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-12-14 08:47:38,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:47:38,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-12-14 08:47:38,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=793, Invalid=1757, Unknown=0, NotChecked=0, Total=2550 [2022-12-14 08:47:38,181 INFO L87 Difference]: Start difference. First operand 217 states and 219 transitions. Second operand has 42 states, 42 states have (on average 5.642857142857143) internal successors, (237), 41 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:38,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:47:38,777 INFO L93 Difference]: Finished difference Result 234 states and 237 transitions. [2022-12-14 08:47:38,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2022-12-14 08:47:38,777 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 5.642857142857143) internal successors, (237), 41 states have internal predecessors, (237), 0 states have call successors, (0), 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 216 [2022-12-14 08:47:38,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:47:38,779 INFO L225 Difference]: With dead ends: 234 [2022-12-14 08:47:38,779 INFO L226 Difference]: Without dead ends: 232 [2022-12-14 08:47:38,780 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 756 GetRequests, 601 SyntacticMatches, 68 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3556 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2356, Invalid=5476, Unknown=0, NotChecked=0, Total=7832 [2022-12-14 08:47:38,780 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 119 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 381 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 385 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:47:38,780 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 332 Invalid, 385 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 381 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:47:38,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2022-12-14 08:47:38,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 225. [2022-12-14 08:47:38,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 224 states have (on average 1.0133928571428572) internal successors, (227), 224 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:38,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 227 transitions. [2022-12-14 08:47:38,811 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 227 transitions. Word has length 216 [2022-12-14 08:47:38,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:47:38,812 INFO L495 AbstractCegarLoop]: Abstraction has 225 states and 227 transitions. [2022-12-14 08:47:38,812 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 5.642857142857143) internal successors, (237), 41 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:38,812 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 227 transitions. [2022-12-14 08:47:38,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2022-12-14 08:47:38,812 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:47:38,812 INFO L195 NwaCegarLoop]: trace histogram [37, 36, 36, 36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:47:38,818 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2022-12-14 08:47:39,013 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:39,013 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:47:39,014 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:47:39,014 INFO L85 PathProgramCache]: Analyzing trace with hash 1516925547, now seen corresponding path program 52 times [2022-12-14 08:47:39,015 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:47:39,015 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1935883206] [2022-12-14 08:47:39,015 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:39,015 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:47:39,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:40,845 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 2487 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:40,846 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:47:40,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1935883206] [2022-12-14 08:47:40,846 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1935883206] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:47:40,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1368510963] [2022-12-14 08:47:40,846 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:47:40,846 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:40,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:47:40,847 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:47:40,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-12-14 08:47:40,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:40,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 829 conjuncts, 74 conjunts are in the unsatisfiable core [2022-12-14 08:47:40,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:47:42,317 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 2590 proven. 1260 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:47:42,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:47:43,402 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 2590 proven. 1260 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:47:43,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1368510963] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:47:43,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [981007915] [2022-12-14 08:47:43,403 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:47:43,403 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:47:43,403 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:47:43,403 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:47:43,403 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:47:43,482 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:47:44,006 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '67596#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:47:44,006 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:47:44,006 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:47:44,006 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 74, 74] total 113 [2022-12-14 08:47:44,007 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517690855] [2022-12-14 08:47:44,007 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:47:44,007 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2022-12-14 08:47:44,007 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:47:44,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2022-12-14 08:47:44,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2953, Invalid=11809, Unknown=0, NotChecked=0, Total=14762 [2022-12-14 08:47:44,010 INFO L87 Difference]: Start difference. First operand 225 states and 227 transitions. Second operand has 113 states, 113 states have (on average 3.327433628318584) internal successors, (376), 113 states have internal predecessors, (376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:45,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:47:45,462 INFO L93 Difference]: Finished difference Result 484 states and 523 transitions. [2022-12-14 08:47:45,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2022-12-14 08:47:45,462 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 3.327433628318584) internal successors, (376), 113 states have internal predecessors, (376), 0 states have call successors, (0), 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 224 [2022-12-14 08:47:45,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:47:45,463 INFO L225 Difference]: With dead ends: 484 [2022-12-14 08:47:45,463 INFO L226 Difference]: Without dead ends: 335 [2022-12-14 08:47:45,464 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 781 GetRequests, 555 SyntacticMatches, 70 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9543 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=5619, Invalid=19187, Unknown=0, NotChecked=0, Total=24806 [2022-12-14 08:47:45,464 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 370 mSDsluCounter, 777 mSDsCounter, 0 mSdLazyCounter, 896 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 370 SdHoareTripleChecker+Valid, 851 SdHoareTripleChecker+Invalid, 1064 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 896 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 08:47:45,464 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [370 Valid, 851 Invalid, 1064 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 896 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 08:47:45,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2022-12-14 08:47:45,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 227. [2022-12-14 08:47:45,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 226 states have (on average 1.0132743362831858) internal successors, (229), 226 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:45,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 229 transitions. [2022-12-14 08:47:45,493 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 229 transitions. Word has length 224 [2022-12-14 08:47:45,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:47:45,493 INFO L495 AbstractCegarLoop]: Abstraction has 227 states and 229 transitions. [2022-12-14 08:47:45,493 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 3.327433628318584) internal successors, (376), 113 states have internal predecessors, (376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:45,493 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 229 transitions. [2022-12-14 08:47:45,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2022-12-14 08:47:45,494 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:47:45,494 INFO L195 NwaCegarLoop]: trace histogram [37, 37, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:47:45,498 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Ended with exit code 0 [2022-12-14 08:47:45,694 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2022-12-14 08:47:45,695 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:47:45,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:47:45,696 INFO L85 PathProgramCache]: Analyzing trace with hash 297901008, now seen corresponding path program 53 times [2022-12-14 08:47:45,696 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:47:45,697 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302192013] [2022-12-14 08:47:45,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:45,697 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:47:45,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:47,580 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2487 proven. 1437 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:47,580 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:47:47,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302192013] [2022-12-14 08:47:47,581 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1302192013] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:47:47,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1622738004] [2022-12-14 08:47:47,581 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:47:47,581 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:47,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:47:47,582 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:47:47,582 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-12-14 08:47:47,741 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2022-12-14 08:47:47,741 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:47:47,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 839 conjuncts, 76 conjunts are in the unsatisfiable core [2022-12-14 08:47:47,747 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:47:49,669 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2592 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:49,669 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:47:51,027 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2592 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:51,027 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1622738004] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:47:51,027 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1315648437] [2022-12-14 08:47:51,028 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:47:51,028 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:47:51,029 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:47:51,029 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:47:51,029 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:47:51,115 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:47:51,748 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '70184#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:47:51,748 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:47:51,749 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:47:51,749 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 115 [2022-12-14 08:47:51,749 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653095504] [2022-12-14 08:47:51,749 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:47:51,750 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2022-12-14 08:47:51,750 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:47:51,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2022-12-14 08:47:51,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3069, Invalid=12183, Unknown=0, NotChecked=0, Total=15252 [2022-12-14 08:47:51,752 INFO L87 Difference]: Start difference. First operand 227 states and 229 transitions. Second operand has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:53,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:47:53,242 INFO L93 Difference]: Finished difference Result 491 states and 531 transitions. [2022-12-14 08:47:53,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2022-12-14 08:47:53,243 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 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 226 [2022-12-14 08:47:53,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:47:53,243 INFO L225 Difference]: With dead ends: 491 [2022-12-14 08:47:53,243 INFO L226 Difference]: Without dead ends: 340 [2022-12-14 08:47:53,244 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 789 GetRequests, 558 SyntacticMatches, 72 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9874 ImplicationChecksByTransitivity, 5.0s TimeCoverageRelationStatistics Valid=5883, Invalid=19877, Unknown=0, NotChecked=0, Total=25760 [2022-12-14 08:47:53,245 INFO L413 NwaCegarLoop]: 76 mSDtfsCounter, 354 mSDsluCounter, 758 mSDsCounter, 0 mSdLazyCounter, 869 mSolverCounterSat, 160 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 354 SdHoareTripleChecker+Valid, 834 SdHoareTripleChecker+Invalid, 1029 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 160 IncrementalHoareTripleChecker+Valid, 869 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 08:47:53,245 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [354 Valid, 834 Invalid, 1029 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [160 Valid, 869 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 08:47:53,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2022-12-14 08:47:53,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 229. [2022-12-14 08:47:53,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 228 states have (on average 1.013157894736842) internal successors, (231), 228 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:53,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 231 transitions. [2022-12-14 08:47:53,269 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 231 transitions. Word has length 226 [2022-12-14 08:47:53,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:47:53,269 INFO L495 AbstractCegarLoop]: Abstraction has 229 states and 231 transitions. [2022-12-14 08:47:53,269 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:53,269 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 231 transitions. [2022-12-14 08:47:53,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2022-12-14 08:47:53,270 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:47:53,270 INFO L195 NwaCegarLoop]: trace histogram [38, 37, 37, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:47:53,275 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Ended with exit code 0 [2022-12-14 08:47:53,470 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2022-12-14 08:47:53,471 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:47:53,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:47:53,472 INFO L85 PathProgramCache]: Analyzing trace with hash 1341390837, now seen corresponding path program 54 times [2022-12-14 08:47:53,472 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:47:53,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1677673380] [2022-12-14 08:47:53,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:53,473 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:47:53,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:47:54,908 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1332 proven. 2666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:54,908 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:47:54,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1677673380] [2022-12-14 08:47:54,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1677673380] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:47:54,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [143295585] [2022-12-14 08:47:54,909 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:47:54,909 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:54,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:47:54,909 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:47:54,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-12-14 08:47:55,013 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:47:55,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:47:55,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 849 conjuncts, 80 conjunts are in the unsatisfiable core [2022-12-14 08:47:55,019 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:47:55,217 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1406 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:55,217 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:47:56,168 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1406 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:47:56,168 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [143295585] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:47:56,168 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1869360888] [2022-12-14 08:47:56,169 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:47:56,169 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:47:56,169 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:47:56,169 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:47:56,169 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:47:56,229 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:47:56,624 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '72728#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:47:56,624 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:47:56,624 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:47:56,624 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 43 [2022-12-14 08:47:56,624 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097256092] [2022-12-14 08:47:56,624 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:47:56,624 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-12-14 08:47:56,624 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:47:56,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-12-14 08:47:56,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=872, Invalid=1884, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 08:47:56,625 INFO L87 Difference]: Start difference. First operand 229 states and 231 transitions. Second operand has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:57,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:47:57,306 INFO L93 Difference]: Finished difference Result 246 states and 249 transitions. [2022-12-14 08:47:57,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2022-12-14 08:47:57,307 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 228 [2022-12-14 08:47:57,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:47:57,307 INFO L225 Difference]: With dead ends: 246 [2022-12-14 08:47:57,308 INFO L226 Difference]: Without dead ends: 244 [2022-12-14 08:47:57,308 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 798 GetRequests, 635 SyntacticMatches, 72 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3904 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=2597, Invalid=5959, Unknown=0, NotChecked=0, Total=8556 [2022-12-14 08:47:57,308 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 125 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 415 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 125 SdHoareTripleChecker+Valid, 364 SdHoareTripleChecker+Invalid, 419 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 415 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:47:57,309 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [125 Valid, 364 Invalid, 419 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 415 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:47:57,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2022-12-14 08:47:57,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 237. [2022-12-14 08:47:57,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 236 states have (on average 1.0127118644067796) internal successors, (239), 236 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:57,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 239 transitions. [2022-12-14 08:47:57,338 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 239 transitions. Word has length 228 [2022-12-14 08:47:57,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:47:57,338 INFO L495 AbstractCegarLoop]: Abstraction has 237 states and 239 transitions. [2022-12-14 08:47:57,338 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:47:57,338 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 239 transitions. [2022-12-14 08:47:57,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2022-12-14 08:47:57,339 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:47:57,339 INFO L195 NwaCegarLoop]: trace histogram [39, 38, 38, 38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:47:57,344 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2022-12-14 08:47:57,539 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:47:57,540 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:47:57,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:47:57,541 INFO L85 PathProgramCache]: Analyzing trace with hash 1724878043, now seen corresponding path program 55 times [2022-12-14 08:47:57,541 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:47:57,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [304373192] [2022-12-14 08:47:57,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:47:57,542 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:47:57,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:48:00,093 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2777 proven. 1517 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:00,093 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:48:00,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [304373192] [2022-12-14 08:48:00,093 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [304373192] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:48:00,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1985217751] [2022-12-14 08:48:00,093 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:48:00,094 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:48:00,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:48:00,094 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:48:00,095 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2022-12-14 08:48:00,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:48:00,182 INFO L263 TraceCheckSpWp]: Trace formula consists of 873 conjuncts, 78 conjunts are in the unsatisfiable core [2022-12-14 08:48:00,184 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:48:02,146 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2886 proven. 1406 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:48:02,146 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:48:03,431 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2886 proven. 1406 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:48:03,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1985217751] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:48:03,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1121490466] [2022-12-14 08:48:03,432 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:48:03,432 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:48:03,432 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:48:03,432 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:48:03,432 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:48:03,498 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:48:04,072 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '75064#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:48:04,073 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:48:04,073 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:48:04,073 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 78, 78] total 119 [2022-12-14 08:48:04,073 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470556851] [2022-12-14 08:48:04,073 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:48:04,074 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2022-12-14 08:48:04,074 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:48:04,075 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2022-12-14 08:48:04,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3267, Invalid=12989, Unknown=0, NotChecked=0, Total=16256 [2022-12-14 08:48:04,076 INFO L87 Difference]: Start difference. First operand 237 states and 239 transitions. Second operand has 119 states, 119 states have (on average 3.327731092436975) internal successors, (396), 119 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:05,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:48:05,708 INFO L93 Difference]: Finished difference Result 510 states and 551 transitions. [2022-12-14 08:48:05,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2022-12-14 08:48:05,709 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 3.327731092436975) internal successors, (396), 119 states have internal predecessors, (396), 0 states have call successors, (0), 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 236 [2022-12-14 08:48:05,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:48:05,711 INFO L225 Difference]: With dead ends: 510 [2022-12-14 08:48:05,711 INFO L226 Difference]: Without dead ends: 353 [2022-12-14 08:48:05,712 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 823 GetRequests, 585 SyntacticMatches, 74 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10529 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=6233, Invalid=21157, Unknown=0, NotChecked=0, Total=27390 [2022-12-14 08:48:05,712 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 368 mSDsluCounter, 961 mSDsCounter, 0 mSdLazyCounter, 1092 mSolverCounterSat, 166 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 368 SdHoareTripleChecker+Valid, 1039 SdHoareTripleChecker+Invalid, 1258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 166 IncrementalHoareTripleChecker+Valid, 1092 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 08:48:05,712 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [368 Valid, 1039 Invalid, 1258 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [166 Valid, 1092 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 08:48:05,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2022-12-14 08:48:05,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 239. [2022-12-14 08:48:05,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 238 states have (on average 1.0126050420168067) internal successors, (241), 238 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:05,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 241 transitions. [2022-12-14 08:48:05,739 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 241 transitions. Word has length 236 [2022-12-14 08:48:05,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:48:05,739 INFO L495 AbstractCegarLoop]: Abstraction has 239 states and 241 transitions. [2022-12-14 08:48:05,739 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 3.327731092436975) internal successors, (396), 119 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:05,739 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 241 transitions. [2022-12-14 08:48:05,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2022-12-14 08:48:05,740 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:48:05,740 INFO L195 NwaCegarLoop]: trace histogram [39, 39, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:48:05,744 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2022-12-14 08:48:05,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable57 [2022-12-14 08:48:05,941 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:48:05,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:48:05,942 INFO L85 PathProgramCache]: Analyzing trace with hash -379402560, now seen corresponding path program 56 times [2022-12-14 08:48:05,942 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:48:05,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2004152442] [2022-12-14 08:48:05,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:48:05,943 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:48:06,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:48:08,359 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2777 proven. 1593 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:08,359 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:48:08,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2004152442] [2022-12-14 08:48:08,359 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2004152442] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:48:08,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [279645822] [2022-12-14 08:48:08,359 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:48:08,359 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:48:08,359 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:48:08,360 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:48:08,361 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2022-12-14 08:48:08,520 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2022-12-14 08:48:08,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:48:08,524 INFO L263 TraceCheckSpWp]: Trace formula consists of 883 conjuncts, 80 conjunts are in the unsatisfiable core [2022-12-14 08:48:08,526 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:48:10,372 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2888 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:10,373 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:48:11,731 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2888 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:11,732 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [279645822] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:48:11,732 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2013503011] [2022-12-14 08:48:11,733 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:48:11,733 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:48:11,733 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:48:11,733 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:48:11,733 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:48:11,801 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:48:12,422 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '77790#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:48:12,423 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:48:12,423 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:48:12,423 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 121 [2022-12-14 08:48:12,423 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438223887] [2022-12-14 08:48:12,423 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:48:12,424 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2022-12-14 08:48:12,424 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:48:12,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2022-12-14 08:48:12,426 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3389, Invalid=13381, Unknown=0, NotChecked=0, Total=16770 [2022-12-14 08:48:12,426 INFO L87 Difference]: Start difference. First operand 239 states and 241 transitions. Second operand has 121 states, 121 states have (on average 3.2892561983471076) internal successors, (398), 121 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:13,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:48:13,888 INFO L93 Difference]: Finished difference Result 517 states and 559 transitions. [2022-12-14 08:48:13,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2022-12-14 08:48:13,888 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 3.2892561983471076) internal successors, (398), 121 states have internal predecessors, (398), 0 states have call successors, (0), 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 238 [2022-12-14 08:48:13,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:48:13,889 INFO L225 Difference]: With dead ends: 517 [2022-12-14 08:48:13,889 INFO L226 Difference]: Without dead ends: 358 [2022-12-14 08:48:13,890 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 831 GetRequests, 588 SyntacticMatches, 76 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10876 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=6511, Invalid=21881, Unknown=0, NotChecked=0, Total=28392 [2022-12-14 08:48:13,891 INFO L413 NwaCegarLoop]: 80 mSDtfsCounter, 355 mSDsluCounter, 815 mSDsCounter, 0 mSdLazyCounter, 938 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 355 SdHoareTripleChecker+Valid, 895 SdHoareTripleChecker+Invalid, 1096 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 938 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:48:13,891 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [355 Valid, 895 Invalid, 1096 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 938 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:48:13,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2022-12-14 08:48:13,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 241. [2022-12-14 08:48:13,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 240 states have (on average 1.0125) internal successors, (243), 240 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:13,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 243 transitions. [2022-12-14 08:48:13,918 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 243 transitions. Word has length 238 [2022-12-14 08:48:13,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:48:13,919 INFO L495 AbstractCegarLoop]: Abstraction has 241 states and 243 transitions. [2022-12-14 08:48:13,919 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 3.2892561983471076) internal successors, (398), 121 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:13,919 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 243 transitions. [2022-12-14 08:48:13,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2022-12-14 08:48:13,919 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:48:13,919 INFO L195 NwaCegarLoop]: trace histogram [40, 39, 39, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:48:13,924 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Ended with exit code 0 [2022-12-14 08:48:14,120 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2022-12-14 08:48:14,120 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:48:14,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:48:14,121 INFO L85 PathProgramCache]: Analyzing trace with hash 336534373, now seen corresponding path program 57 times [2022-12-14 08:48:14,121 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:48:14,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445121826] [2022-12-14 08:48:14,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:48:14,122 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:48:14,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:48:15,723 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1482 proven. 2966 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:15,723 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:48:15,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445121826] [2022-12-14 08:48:15,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1445121826] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:48:15,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [768824599] [2022-12-14 08:48:15,723 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:48:15,723 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:48:15,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:48:15,724 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:48:15,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2022-12-14 08:48:15,836 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:48:15,836 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:48:15,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 893 conjuncts, 84 conjunts are in the unsatisfiable core [2022-12-14 08:48:15,842 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:48:16,019 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1560 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:16,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:48:16,805 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1560 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:16,806 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [768824599] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:48:16,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1029100507] [2022-12-14 08:48:16,806 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:48:16,806 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:48:16,806 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:48:16,807 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:48:16,807 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:48:16,865 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:48:17,155 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '80468#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:48:17,155 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:48:17,155 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:48:17,155 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 45 [2022-12-14 08:48:17,155 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451276647] [2022-12-14 08:48:17,156 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:48:17,156 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-12-14 08:48:17,156 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:48:17,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-12-14 08:48:17,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=955, Invalid=2015, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 08:48:17,157 INFO L87 Difference]: Start difference. First operand 241 states and 243 transitions. Second operand has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:17,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:48:17,656 INFO L93 Difference]: Finished difference Result 258 states and 261 transitions. [2022-12-14 08:48:17,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2022-12-14 08:48:17,656 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 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 240 [2022-12-14 08:48:17,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:48:17,657 INFO L225 Difference]: With dead ends: 258 [2022-12-14 08:48:17,657 INFO L226 Difference]: Without dead ends: 256 [2022-12-14 08:48:17,658 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 840 GetRequests, 669 SyntacticMatches, 76 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4268 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2850, Invalid=6462, Unknown=0, NotChecked=0, Total=9312 [2022-12-14 08:48:17,658 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 252 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 252 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 08:48:17,658 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [252 Valid, 303 Invalid, 366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 362 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 08:48:17,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2022-12-14 08:48:17,686 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 249. [2022-12-14 08:48:17,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 248 states have (on average 1.0120967741935485) internal successors, (251), 248 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:17,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 251 transitions. [2022-12-14 08:48:17,686 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 251 transitions. Word has length 240 [2022-12-14 08:48:17,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:48:17,687 INFO L495 AbstractCegarLoop]: Abstraction has 249 states and 251 transitions. [2022-12-14 08:48:17,687 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:17,687 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 251 transitions. [2022-12-14 08:48:17,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2022-12-14 08:48:17,687 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:48:17,688 INFO L195 NwaCegarLoop]: trace histogram [41, 40, 40, 40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:48:17,692 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2022-12-14 08:48:17,888 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2022-12-14 08:48:17,888 INFO L420 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:48:17,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:48:17,888 INFO L85 PathProgramCache]: Analyzing trace with hash -175097781, now seen corresponding path program 58 times [2022-12-14 08:48:17,888 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:48:17,888 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2121570817] [2022-12-14 08:48:17,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:48:17,889 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:48:17,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:48:20,225 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3083 proven. 1677 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:20,225 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:48:20,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2121570817] [2022-12-14 08:48:20,225 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2121570817] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:48:20,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [771717662] [2022-12-14 08:48:20,225 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:48:20,226 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:48:20,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:48:20,226 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:48:20,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2022-12-14 08:48:20,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:48:20,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 917 conjuncts, 82 conjunts are in the unsatisfiable core [2022-12-14 08:48:20,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:48:22,505 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3198 proven. 1560 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:48:22,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:48:23,907 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3198 proven. 1560 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:48:23,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [771717662] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:48:23,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [92648077] [2022-12-14 08:48:23,908 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:48:23,908 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:48:23,908 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:48:23,908 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:48:23,909 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:48:23,989 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:48:24,800 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '82922#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:48:24,800 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:48:24,800 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:48:24,800 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 82, 82] total 125 [2022-12-14 08:48:24,800 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [264423357] [2022-12-14 08:48:24,800 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:48:24,801 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2022-12-14 08:48:24,801 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:48:24,802 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2022-12-14 08:48:24,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3597, Invalid=14225, Unknown=0, NotChecked=0, Total=17822 [2022-12-14 08:48:24,803 INFO L87 Difference]: Start difference. First operand 249 states and 251 transitions. Second operand has 125 states, 125 states have (on average 3.328) internal successors, (416), 125 states have internal predecessors, (416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:26,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:48:26,478 INFO L93 Difference]: Finished difference Result 536 states and 579 transitions. [2022-12-14 08:48:26,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2022-12-14 08:48:26,478 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 125 states have (on average 3.328) internal successors, (416), 125 states have internal predecessors, (416), 0 states have call successors, (0), 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 248 [2022-12-14 08:48:26,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:48:26,479 INFO L225 Difference]: With dead ends: 536 [2022-12-14 08:48:26,479 INFO L226 Difference]: Without dead ends: 371 [2022-12-14 08:48:26,480 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 865 GetRequests, 615 SyntacticMatches, 78 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11563 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=6879, Invalid=23223, Unknown=0, NotChecked=0, Total=30102 [2022-12-14 08:48:26,481 INFO L413 NwaCegarLoop]: 82 mSDtfsCounter, 414 mSDsluCounter, 767 mSDsCounter, 0 mSdLazyCounter, 902 mSolverCounterSat, 187 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 414 SdHoareTripleChecker+Valid, 849 SdHoareTripleChecker+Invalid, 1089 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 187 IncrementalHoareTripleChecker+Valid, 902 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 08:48:26,481 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [414 Valid, 849 Invalid, 1089 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [187 Valid, 902 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 08:48:26,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2022-12-14 08:48:26,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 251. [2022-12-14 08:48:26,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 250 states have (on average 1.012) internal successors, (253), 250 states have internal predecessors, (253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:26,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 253 transitions. [2022-12-14 08:48:26,514 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 253 transitions. Word has length 248 [2022-12-14 08:48:26,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:48:26,514 INFO L495 AbstractCegarLoop]: Abstraction has 251 states and 253 transitions. [2022-12-14 08:48:26,514 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 125 states have (on average 3.328) internal successors, (416), 125 states have internal predecessors, (416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:26,514 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 253 transitions. [2022-12-14 08:48:26,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2022-12-14 08:48:26,515 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:48:26,515 INFO L195 NwaCegarLoop]: trace histogram [41, 41, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:48:26,520 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2022-12-14 08:48:26,716 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable60 [2022-12-14 08:48:26,716 INFO L420 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:48:26,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:48:26,717 INFO L85 PathProgramCache]: Analyzing trace with hash -1152728400, now seen corresponding path program 59 times [2022-12-14 08:48:26,717 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:48:26,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [992970352] [2022-12-14 08:48:26,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:48:26,718 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:48:26,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:48:29,462 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3083 proven. 1757 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:29,462 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:48:29,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [992970352] [2022-12-14 08:48:29,463 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [992970352] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:48:29,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [11252129] [2022-12-14 08:48:29,463 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:48:29,463 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:48:29,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:48:29,464 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:48:29,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2022-12-14 08:48:29,695 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2022-12-14 08:48:29,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:48:29,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 927 conjuncts, 84 conjunts are in the unsatisfiable core [2022-12-14 08:48:29,703 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:48:32,015 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3200 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:32,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:48:33,584 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3200 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:33,585 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [11252129] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:48:33,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [91376443] [2022-12-14 08:48:33,585 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:48:33,585 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:48:33,585 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:48:33,585 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:48:33,586 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:48:33,651 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:48:34,338 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '85786#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:48:34,338 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:48:34,338 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:48:34,338 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 127 [2022-12-14 08:48:34,338 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819487172] [2022-12-14 08:48:34,339 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:48:34,339 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2022-12-14 08:48:34,339 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:48:34,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2022-12-14 08:48:34,340 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3725, Invalid=14635, Unknown=0, NotChecked=0, Total=18360 [2022-12-14 08:48:34,341 INFO L87 Difference]: Start difference. First operand 251 states and 253 transitions. Second operand has 127 states, 127 states have (on average 3.2913385826771653) internal successors, (418), 127 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:35,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:48:35,886 INFO L93 Difference]: Finished difference Result 543 states and 587 transitions. [2022-12-14 08:48:35,886 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-12-14 08:48:35,887 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 127 states have (on average 3.2913385826771653) internal successors, (418), 127 states have internal predecessors, (418), 0 states have call successors, (0), 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 250 [2022-12-14 08:48:35,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:48:35,889 INFO L225 Difference]: With dead ends: 543 [2022-12-14 08:48:35,889 INFO L226 Difference]: Without dead ends: 376 [2022-12-14 08:48:35,890 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 873 GetRequests, 618 SyntacticMatches, 80 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11926 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=7171, Invalid=23981, Unknown=0, NotChecked=0, Total=31152 [2022-12-14 08:48:35,891 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 361 mSDsluCounter, 897 mSDsCounter, 0 mSdLazyCounter, 1019 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 361 SdHoareTripleChecker+Valid, 981 SdHoareTripleChecker+Invalid, 1180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 1019 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 08:48:35,891 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [361 Valid, 981 Invalid, 1180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 1019 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 08:48:35,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2022-12-14 08:48:35,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 253. [2022-12-14 08:48:35,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 1.0119047619047619) internal successors, (255), 252 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:35,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 255 transitions. [2022-12-14 08:48:35,920 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 255 transitions. Word has length 250 [2022-12-14 08:48:35,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:48:35,920 INFO L495 AbstractCegarLoop]: Abstraction has 253 states and 255 transitions. [2022-12-14 08:48:35,921 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 127 states have (on average 3.2913385826771653) internal successors, (418), 127 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:35,921 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 255 transitions. [2022-12-14 08:48:35,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2022-12-14 08:48:35,921 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:48:35,921 INFO L195 NwaCegarLoop]: trace histogram [42, 41, 41, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:48:35,927 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2022-12-14 08:48:36,122 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:48:36,122 INFO L420 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:48:36,122 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:48:36,122 INFO L85 PathProgramCache]: Analyzing trace with hash -57915435, now seen corresponding path program 60 times [2022-12-14 08:48:36,122 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:48:36,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1179266485] [2022-12-14 08:48:36,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:48:36,122 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:48:36,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:48:37,699 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1640 proven. 3282 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:37,699 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:48:37,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1179266485] [2022-12-14 08:48:37,699 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1179266485] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:48:37,699 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [855313577] [2022-12-14 08:48:37,700 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:48:37,700 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:48:37,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:48:37,700 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:48:37,701 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2022-12-14 08:48:37,822 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:48:37,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:48:37,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 937 conjuncts, 88 conjunts are in the unsatisfiable core [2022-12-14 08:48:37,829 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:48:38,054 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1722 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:38,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:48:38,946 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1722 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:38,946 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [855313577] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:48:38,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [194879998] [2022-12-14 08:48:38,947 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:48:38,947 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:48:38,947 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:48:38,947 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:48:38,947 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:48:39,020 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:48:39,359 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '88598#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:48:39,359 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:48:39,359 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:48:39,359 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 47 [2022-12-14 08:48:39,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899957614] [2022-12-14 08:48:39,359 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:48:39,360 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-12-14 08:48:39,360 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:48:39,360 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-12-14 08:48:39,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1042, Invalid=2150, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 08:48:39,361 INFO L87 Difference]: Start difference. First operand 253 states and 255 transitions. Second operand has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:40,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:48:40,167 INFO L93 Difference]: Finished difference Result 270 states and 273 transitions. [2022-12-14 08:48:40,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2022-12-14 08:48:40,167 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 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 252 [2022-12-14 08:48:40,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:48:40,168 INFO L225 Difference]: With dead ends: 270 [2022-12-14 08:48:40,168 INFO L226 Difference]: Without dead ends: 268 [2022-12-14 08:48:40,169 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 882 GetRequests, 703 SyntacticMatches, 80 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4648 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3115, Invalid=6985, Unknown=0, NotChecked=0, Total=10100 [2022-12-14 08:48:40,169 INFO L413 NwaCegarLoop]: 50 mSDtfsCounter, 140 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 429 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 376 SdHoareTripleChecker+Invalid, 433 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 429 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:48:40,169 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [140 Valid, 376 Invalid, 433 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 429 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:48:40,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2022-12-14 08:48:40,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 261. [2022-12-14 08:48:40,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 260 states have (on average 1.0115384615384615) internal successors, (263), 260 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:40,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 263 transitions. [2022-12-14 08:48:40,200 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 263 transitions. Word has length 252 [2022-12-14 08:48:40,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:48:40,200 INFO L495 AbstractCegarLoop]: Abstraction has 261 states and 263 transitions. [2022-12-14 08:48:40,200 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:40,200 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 263 transitions. [2022-12-14 08:48:40,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2022-12-14 08:48:40,201 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:48:40,201 INFO L195 NwaCegarLoop]: trace histogram [43, 42, 42, 42, 42, 41, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:48:40,206 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2022-12-14 08:48:40,401 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:48:40,402 INFO L420 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:48:40,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:48:40,403 INFO L85 PathProgramCache]: Analyzing trace with hash -1307446085, now seen corresponding path program 61 times [2022-12-14 08:48:40,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:48:40,404 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186055759] [2022-12-14 08:48:40,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:48:40,404 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:48:40,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:48:43,042 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3405 proven. 1845 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:43,043 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:48:43,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186055759] [2022-12-14 08:48:43,043 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1186055759] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:48:43,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [150938261] [2022-12-14 08:48:43,043 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:48:43,043 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:48:43,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:48:43,044 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:48:43,044 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2022-12-14 08:48:43,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:48:43,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 961 conjuncts, 86 conjunts are in the unsatisfiable core [2022-12-14 08:48:43,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:48:45,111 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3526 proven. 1722 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:48:45,112 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:48:46,926 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3526 proven. 1722 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:48:46,926 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [150938261] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:48:46,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [205236981] [2022-12-14 08:48:46,927 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:48:46,927 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:48:46,928 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:48:46,928 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:48:46,928 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:48:47,004 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:48:47,823 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '91170#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:48:47,823 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:48:47,824 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:48:47,824 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 86, 86] total 131 [2022-12-14 08:48:47,824 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401649809] [2022-12-14 08:48:47,824 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:48:47,825 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 131 states [2022-12-14 08:48:47,825 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:48:47,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2022-12-14 08:48:47,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3943, Invalid=15517, Unknown=0, NotChecked=0, Total=19460 [2022-12-14 08:48:47,827 INFO L87 Difference]: Start difference. First operand 261 states and 263 transitions. Second operand has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:49,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:48:49,607 INFO L93 Difference]: Finished difference Result 562 states and 607 transitions. [2022-12-14 08:48:49,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2022-12-14 08:48:49,608 INFO L78 Accepts]: Start accepts. Automaton has has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 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 260 [2022-12-14 08:48:49,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:48:49,610 INFO L225 Difference]: With dead ends: 562 [2022-12-14 08:48:49,610 INFO L226 Difference]: Without dead ends: 389 [2022-12-14 08:48:49,611 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 907 GetRequests, 645 SyntacticMatches, 82 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12645 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=7557, Invalid=25385, Unknown=0, NotChecked=0, Total=32942 [2022-12-14 08:48:49,612 INFO L413 NwaCegarLoop]: 86 mSDtfsCounter, 416 mSDsluCounter, 809 mSDsCounter, 0 mSdLazyCounter, 936 mSolverCounterSat, 189 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 416 SdHoareTripleChecker+Valid, 895 SdHoareTripleChecker+Invalid, 1125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 189 IncrementalHoareTripleChecker+Valid, 936 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 08:48:49,612 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [416 Valid, 895 Invalid, 1125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [189 Valid, 936 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 08:48:49,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2022-12-14 08:48:49,649 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 263. [2022-12-14 08:48:49,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 262 states have (on average 1.0114503816793894) internal successors, (265), 262 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:49,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 265 transitions. [2022-12-14 08:48:49,649 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 265 transitions. Word has length 260 [2022-12-14 08:48:49,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:48:49,649 INFO L495 AbstractCegarLoop]: Abstraction has 263 states and 265 transitions. [2022-12-14 08:48:49,649 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:49,650 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 265 transitions. [2022-12-14 08:48:49,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2022-12-14 08:48:49,650 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:48:49,650 INFO L195 NwaCegarLoop]: trace histogram [43, 43, 42, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:48:49,655 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2022-12-14 08:48:49,851 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable63,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:48:49,851 INFO L420 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:48:49,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:48:49,852 INFO L85 PathProgramCache]: Analyzing trace with hash 1811877792, now seen corresponding path program 62 times [2022-12-14 08:48:49,853 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:48:49,853 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1020365287] [2022-12-14 08:48:49,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:48:49,853 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:48:49,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:48:52,525 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 3405 proven. 1929 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:52,525 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:48:52,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1020365287] [2022-12-14 08:48:52,526 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1020365287] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:48:52,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1213725185] [2022-12-14 08:48:52,526 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:48:52,526 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:48:52,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:48:52,527 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:48:52,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2022-12-14 08:48:52,707 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2022-12-14 08:48:52,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:48:52,712 INFO L263 TraceCheckSpWp]: Trace formula consists of 971 conjuncts, 88 conjunts are in the unsatisfiable core [2022-12-14 08:48:52,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:48:54,455 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 3528 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:54,455 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:48:55,741 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 3528 proven. 1806 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:48:55,741 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1213725185] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:48:55,741 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1860429962] [2022-12-14 08:48:55,742 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:48:55,742 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:48:55,742 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:48:55,742 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:48:55,742 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:48:55,827 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:48:56,375 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '94172#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:48:56,375 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:48:56,375 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:48:56,375 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 88, 88] total 133 [2022-12-14 08:48:56,375 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006428685] [2022-12-14 08:48:56,375 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:48:56,376 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 133 states [2022-12-14 08:48:56,376 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:48:56,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 133 interpolants. [2022-12-14 08:48:56,378 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4077, Invalid=15945, Unknown=0, NotChecked=0, Total=20022 [2022-12-14 08:48:56,378 INFO L87 Difference]: Start difference. First operand 263 states and 265 transitions. Second operand has 133 states, 133 states have (on average 3.293233082706767) internal successors, (438), 133 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:58,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:48:58,245 INFO L93 Difference]: Finished difference Result 569 states and 615 transitions. [2022-12-14 08:48:58,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 88 states. [2022-12-14 08:48:58,245 INFO L78 Accepts]: Start accepts. Automaton has has 133 states, 133 states have (on average 3.293233082706767) internal successors, (438), 133 states have internal predecessors, (438), 0 states have call successors, (0), 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 262 [2022-12-14 08:48:58,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:48:58,246 INFO L225 Difference]: With dead ends: 569 [2022-12-14 08:48:58,246 INFO L226 Difference]: Without dead ends: 394 [2022-12-14 08:48:58,247 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 915 GetRequests, 648 SyntacticMatches, 84 SemanticMatches, 183 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13024 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=7863, Invalid=26177, Unknown=0, NotChecked=0, Total=34040 [2022-12-14 08:48:58,248 INFO L413 NwaCegarLoop]: 88 mSDtfsCounter, 465 mSDsluCounter, 877 mSDsCounter, 0 mSdLazyCounter, 1014 mSolverCounterSat, 211 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 465 SdHoareTripleChecker+Valid, 965 SdHoareTripleChecker+Invalid, 1225 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 211 IncrementalHoareTripleChecker+Valid, 1014 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 08:48:58,248 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [465 Valid, 965 Invalid, 1225 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [211 Valid, 1014 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 08:48:58,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2022-12-14 08:48:58,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 265. [2022-12-14 08:48:58,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 264 states have (on average 1.0113636363636365) internal successors, (267), 264 states have internal predecessors, (267), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:58,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 267 transitions. [2022-12-14 08:48:58,280 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 267 transitions. Word has length 262 [2022-12-14 08:48:58,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:48:58,281 INFO L495 AbstractCegarLoop]: Abstraction has 265 states and 267 transitions. [2022-12-14 08:48:58,281 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 133 states, 133 states have (on average 3.293233082706767) internal successors, (438), 133 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:48:58,281 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 267 transitions. [2022-12-14 08:48:58,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2022-12-14 08:48:58,281 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:48:58,281 INFO L195 NwaCegarLoop]: trace histogram [44, 43, 43, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:48:58,286 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2022-12-14 08:48:58,482 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:48:58,483 INFO L420 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:48:58,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:48:58,484 INFO L85 PathProgramCache]: Analyzing trace with hash 1594950981, now seen corresponding path program 63 times [2022-12-14 08:48:58,484 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:48:58,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1213541333] [2022-12-14 08:48:58,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:48:58,485 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:48:58,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:00,263 INFO L134 CoverageAnalysis]: Checked inductivity of 5420 backedges. 1806 proven. 3614 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:00,263 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:00,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1213541333] [2022-12-14 08:49:00,264 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1213541333] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:00,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [375339820] [2022-12-14 08:49:00,264 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:49:00,264 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:00,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:00,265 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:00,265 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2022-12-14 08:49:00,417 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:49:00,417 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:49:00,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 981 conjuncts, 92 conjunts are in the unsatisfiable core [2022-12-14 08:49:00,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:00,610 INFO L134 CoverageAnalysis]: Checked inductivity of 5420 backedges. 1892 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:00,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:01,667 INFO L134 CoverageAnalysis]: Checked inductivity of 5420 backedges. 1892 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:01,667 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [375339820] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:01,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1351140904] [2022-12-14 08:49:01,668 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:49:01,668 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:01,668 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:01,668 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:01,668 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:01,744 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:02,188 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '97118#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:02,188 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:02,188 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:02,188 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46] total 49 [2022-12-14 08:49:02,188 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022017843] [2022-12-14 08:49:02,188 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:02,189 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-12-14 08:49:02,189 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:02,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-12-14 08:49:02,190 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1133, Invalid=2289, Unknown=0, NotChecked=0, Total=3422 [2022-12-14 08:49:02,190 INFO L87 Difference]: Start difference. First operand 265 states and 267 transitions. Second operand has 50 states, 50 states have (on average 5.7) internal successors, (285), 49 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:02,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:02,942 INFO L93 Difference]: Finished difference Result 282 states and 285 transitions. [2022-12-14 08:49:02,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-12-14 08:49:02,943 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 5.7) internal successors, (285), 49 states have internal predecessors, (285), 0 states have call successors, (0), 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 264 [2022-12-14 08:49:02,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:02,943 INFO L225 Difference]: With dead ends: 282 [2022-12-14 08:49:02,944 INFO L226 Difference]: Without dead ends: 280 [2022-12-14 08:49:02,944 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 924 GetRequests, 737 SyntacticMatches, 84 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5044 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=3392, Invalid=7528, Unknown=0, NotChecked=0, Total=10920 [2022-12-14 08:49:02,944 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 279 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 407 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 279 SdHoareTripleChecker+Valid, 334 SdHoareTripleChecker+Invalid, 411 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:02,945 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [279 Valid, 334 Invalid, 411 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 407 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:49:02,945 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 280 states. [2022-12-14 08:49:02,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 280 to 273. [2022-12-14 08:49:02,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 273 states, 272 states have (on average 1.0110294117647058) internal successors, (275), 272 states have internal predecessors, (275), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:02,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 273 states to 273 states and 275 transitions. [2022-12-14 08:49:02,982 INFO L78 Accepts]: Start accepts. Automaton has 273 states and 275 transitions. Word has length 264 [2022-12-14 08:49:02,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:02,982 INFO L495 AbstractCegarLoop]: Abstraction has 273 states and 275 transitions. [2022-12-14 08:49:02,982 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 5.7) internal successors, (285), 49 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:02,982 INFO L276 IsEmpty]: Start isEmpty. Operand 273 states and 275 transitions. [2022-12-14 08:49:02,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 273 [2022-12-14 08:49:02,983 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:02,983 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 44, 44, 43, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:49:02,988 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2022-12-14 08:49:03,183 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable65 [2022-12-14 08:49:03,183 INFO L420 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:03,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:03,184 INFO L85 PathProgramCache]: Analyzing trace with hash -1267056085, now seen corresponding path program 64 times [2022-12-14 08:49:03,184 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:03,184 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1451048713] [2022-12-14 08:49:03,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:03,184 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:03,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:06,252 INFO L134 CoverageAnalysis]: Checked inductivity of 5764 backedges. 3743 proven. 2021 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:06,252 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:06,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1451048713] [2022-12-14 08:49:06,252 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1451048713] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:06,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [521877300] [2022-12-14 08:49:06,253 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:49:06,253 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:06,253 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:06,253 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:06,254 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2022-12-14 08:49:06,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:06,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 1005 conjuncts, 90 conjunts are in the unsatisfiable core [2022-12-14 08:49:06,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:08,633 INFO L134 CoverageAnalysis]: Checked inductivity of 5764 backedges. 3870 proven. 1892 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:49:08,633 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:09,997 INFO L134 CoverageAnalysis]: Checked inductivity of 5764 backedges. 3870 proven. 1892 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:49:09,997 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [521877300] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:09,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1526809405] [2022-12-14 08:49:09,998 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:49:09,998 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:09,998 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:09,998 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:09,998 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:10,067 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:10,663 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '99808#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:10,663 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:10,663 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:10,663 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [91, 90, 90] total 137 [2022-12-14 08:49:10,663 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478860358] [2022-12-14 08:49:10,664 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:10,664 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 137 states [2022-12-14 08:49:10,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:10,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 137 interpolants. [2022-12-14 08:49:10,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4305, Invalid=16865, Unknown=0, NotChecked=0, Total=21170 [2022-12-14 08:49:10,667 INFO L87 Difference]: Start difference. First operand 273 states and 275 transitions. Second operand has 137 states, 137 states have (on average 3.3284671532846715) internal successors, (456), 137 states have internal predecessors, (456), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:12,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:12,638 INFO L93 Difference]: Finished difference Result 588 states and 635 transitions. [2022-12-14 08:49:12,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2022-12-14 08:49:12,638 INFO L78 Accepts]: Start accepts. Automaton has has 137 states, 137 states have (on average 3.3284671532846715) internal successors, (456), 137 states have internal predecessors, (456), 0 states have call successors, (0), 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 272 [2022-12-14 08:49:12,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:12,640 INFO L225 Difference]: With dead ends: 588 [2022-12-14 08:49:12,640 INFO L226 Difference]: Without dead ends: 407 [2022-12-14 08:49:12,642 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 949 GetRequests, 675 SyntacticMatches, 86 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13775 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=8267, Invalid=27643, Unknown=0, NotChecked=0, Total=35910 [2022-12-14 08:49:12,642 INFO L413 NwaCegarLoop]: 90 mSDtfsCounter, 383 mSDsluCounter, 946 mSDsCounter, 0 mSdLazyCounter, 1084 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 383 SdHoareTripleChecker+Valid, 1036 SdHoareTripleChecker+Invalid, 1255 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 1084 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:12,642 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [383 Valid, 1036 Invalid, 1255 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 1084 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 08:49:12,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 407 states. [2022-12-14 08:49:12,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 407 to 275. [2022-12-14 08:49:12,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 275 states, 274 states have (on average 1.010948905109489) internal successors, (277), 274 states have internal predecessors, (277), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:12,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 277 transitions. [2022-12-14 08:49:12,679 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 277 transitions. Word has length 272 [2022-12-14 08:49:12,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:12,679 INFO L495 AbstractCegarLoop]: Abstraction has 275 states and 277 transitions. [2022-12-14 08:49:12,679 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 137 states, 137 states have (on average 3.3284671532846715) internal successors, (456), 137 states have internal predecessors, (456), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:12,679 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 277 transitions. [2022-12-14 08:49:12,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 275 [2022-12-14 08:49:12,680 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:12,680 INFO L195 NwaCegarLoop]: trace histogram [45, 45, 44, 44, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:49:12,684 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Ended with exit code 0 [2022-12-14 08:49:12,881 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2022-12-14 08:49:12,881 INFO L420 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:12,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:12,882 INFO L85 PathProgramCache]: Analyzing trace with hash -1664799344, now seen corresponding path program 65 times [2022-12-14 08:49:12,883 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:12,883 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [812351204] [2022-12-14 08:49:12,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:12,883 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:12,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:15,829 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 3743 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:15,829 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:15,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [812351204] [2022-12-14 08:49:15,829 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [812351204] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:15,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1977666099] [2022-12-14 08:49:15,829 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:49:15,830 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:15,830 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:15,830 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:15,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2022-12-14 08:49:16,031 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 45 check-sat command(s) [2022-12-14 08:49:16,031 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:49:16,036 INFO L263 TraceCheckSpWp]: Trace formula consists of 1015 conjuncts, 92 conjunts are in the unsatisfiable core [2022-12-14 08:49:16,038 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:18,599 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 3872 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:18,599 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:20,539 INFO L134 CoverageAnalysis]: Checked inductivity of 5852 backedges. 3872 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:20,539 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1977666099] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:20,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [104146581] [2022-12-14 08:49:20,540 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:49:20,540 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:20,540 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:20,540 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:20,540 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:20,616 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:21,367 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '102948#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:21,367 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:21,367 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:21,367 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [92, 92, 92] total 139 [2022-12-14 08:49:21,367 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969201117] [2022-12-14 08:49:21,368 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:21,368 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 139 states [2022-12-14 08:49:21,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:21,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 139 interpolants. [2022-12-14 08:49:21,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4445, Invalid=17311, Unknown=0, NotChecked=0, Total=21756 [2022-12-14 08:49:21,370 INFO L87 Difference]: Start difference. First operand 275 states and 277 transitions. Second operand has 139 states, 139 states have (on average 3.2949640287769784) internal successors, (458), 139 states have internal predecessors, (458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:23,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:23,317 INFO L93 Difference]: Finished difference Result 595 states and 643 transitions. [2022-12-14 08:49:23,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 92 states. [2022-12-14 08:49:23,317 INFO L78 Accepts]: Start accepts. Automaton has has 139 states, 139 states have (on average 3.2949640287769784) internal successors, (458), 139 states have internal predecessors, (458), 0 states have call successors, (0), 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 274 [2022-12-14 08:49:23,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:23,319 INFO L225 Difference]: With dead ends: 595 [2022-12-14 08:49:23,319 INFO L226 Difference]: Without dead ends: 412 [2022-12-14 08:49:23,321 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 957 GetRequests, 678 SyntacticMatches, 88 SemanticMatches, 191 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14170 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=8587, Invalid=28469, Unknown=0, NotChecked=0, Total=37056 [2022-12-14 08:49:23,321 INFO L413 NwaCegarLoop]: 92 mSDtfsCounter, 389 mSDsluCounter, 999 mSDsCounter, 0 mSdLazyCounter, 1138 mSolverCounterSat, 172 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 389 SdHoareTripleChecker+Valid, 1091 SdHoareTripleChecker+Invalid, 1310 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 172 IncrementalHoareTripleChecker+Valid, 1138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:23,322 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [389 Valid, 1091 Invalid, 1310 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [172 Valid, 1138 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 08:49:23,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 412 states. [2022-12-14 08:49:23,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 412 to 277. [2022-12-14 08:49:23,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 277 states, 276 states have (on average 1.0108695652173914) internal successors, (279), 276 states have internal predecessors, (279), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:23,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 277 states to 277 states and 279 transitions. [2022-12-14 08:49:23,361 INFO L78 Accepts]: Start accepts. Automaton has 277 states and 279 transitions. Word has length 274 [2022-12-14 08:49:23,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:23,361 INFO L495 AbstractCegarLoop]: Abstraction has 277 states and 279 transitions. [2022-12-14 08:49:23,361 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 139 states, 139 states have (on average 3.2949640287769784) internal successors, (458), 139 states have internal predecessors, (458), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:23,361 INFO L276 IsEmpty]: Start isEmpty. Operand 277 states and 279 transitions. [2022-12-14 08:49:23,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2022-12-14 08:49:23,362 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:23,362 INFO L195 NwaCegarLoop]: trace histogram [46, 45, 45, 44, 44, 44, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:49:23,367 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2022-12-14 08:49:23,563 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable67,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:23,563 INFO L420 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:23,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:23,564 INFO L85 PathProgramCache]: Analyzing trace with hash -1643981899, now seen corresponding path program 66 times [2022-12-14 08:49:23,564 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:23,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278408042] [2022-12-14 08:49:23,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:23,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:23,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:25,482 INFO L134 CoverageAnalysis]: Checked inductivity of 5942 backedges. 1980 proven. 3962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:25,482 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:25,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278408042] [2022-12-14 08:49:25,482 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [278408042] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:25,482 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1885268533] [2022-12-14 08:49:25,482 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:49:25,482 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:25,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:25,483 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:25,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2022-12-14 08:49:25,639 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:49:25,640 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:49:25,644 INFO L263 TraceCheckSpWp]: Trace formula consists of 1025 conjuncts, 96 conjunts are in the unsatisfiable core [2022-12-14 08:49:25,647 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:25,827 INFO L134 CoverageAnalysis]: Checked inductivity of 5942 backedges. 2070 proven. 3872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:25,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:26,840 INFO L134 CoverageAnalysis]: Checked inductivity of 5942 backedges. 2070 proven. 3872 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:26,841 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1885268533] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:26,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1811024071] [2022-12-14 08:49:26,841 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:49:26,841 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:26,841 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:26,841 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:26,841 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:26,913 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:27,220 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '106028#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:27,220 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:27,220 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:27,221 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 51 [2022-12-14 08:49:27,221 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905736948] [2022-12-14 08:49:27,221 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:27,221 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-12-14 08:49:27,221 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:27,222 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-12-14 08:49:27,222 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1228, Invalid=2432, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 08:49:27,222 INFO L87 Difference]: Start difference. First operand 277 states and 279 transitions. Second operand has 52 states, 52 states have (on average 5.711538461538462) internal successors, (297), 51 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:27,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:27,988 INFO L93 Difference]: Finished difference Result 294 states and 297 transitions. [2022-12-14 08:49:27,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-12-14 08:49:27,989 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 5.711538461538462) internal successors, (297), 51 states have internal predecessors, (297), 0 states have call successors, (0), 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 276 [2022-12-14 08:49:27,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:27,990 INFO L225 Difference]: With dead ends: 294 [2022-12-14 08:49:27,990 INFO L226 Difference]: Without dead ends: 292 [2022-12-14 08:49:27,990 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 966 GetRequests, 771 SyntacticMatches, 88 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5456 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=3681, Invalid=8091, Unknown=0, NotChecked=0, Total=11772 [2022-12-14 08:49:27,991 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 289 mSDsluCounter, 287 mSDsCounter, 0 mSdLazyCounter, 420 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 289 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 424 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 420 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:27,991 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [289 Valid, 341 Invalid, 424 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 420 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:49:27,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 292 states. [2022-12-14 08:49:28,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 292 to 285. [2022-12-14 08:49:28,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 285 states, 284 states have (on average 1.0105633802816902) internal successors, (287), 284 states have internal predecessors, (287), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:28,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285 states to 285 states and 287 transitions. [2022-12-14 08:49:28,027 INFO L78 Accepts]: Start accepts. Automaton has 285 states and 287 transitions. Word has length 276 [2022-12-14 08:49:28,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:28,027 INFO L495 AbstractCegarLoop]: Abstraction has 285 states and 287 transitions. [2022-12-14 08:49:28,027 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 5.711538461538462) internal successors, (297), 51 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:28,027 INFO L276 IsEmpty]: Start isEmpty. Operand 285 states and 287 transitions. [2022-12-14 08:49:28,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2022-12-14 08:49:28,028 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:28,028 INFO L195 NwaCegarLoop]: trace histogram [47, 46, 46, 46, 46, 45, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:49:28,032 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2022-12-14 08:49:28,228 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable68 [2022-12-14 08:49:28,229 INFO L420 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:28,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:28,230 INFO L85 PathProgramCache]: Analyzing trace with hash 1638834331, now seen corresponding path program 67 times [2022-12-14 08:49:28,230 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:28,231 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675692938] [2022-12-14 08:49:28,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:28,231 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:28,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:31,330 INFO L134 CoverageAnalysis]: Checked inductivity of 6302 backedges. 4097 proven. 2205 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:31,331 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:31,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675692938] [2022-12-14 08:49:31,331 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [675692938] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:31,331 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1607908706] [2022-12-14 08:49:31,331 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:49:31,331 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:31,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:31,332 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:31,333 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2022-12-14 08:49:31,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:31,432 INFO L263 TraceCheckSpWp]: Trace formula consists of 1049 conjuncts, 94 conjunts are in the unsatisfiable core [2022-12-14 08:49:31,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:34,022 INFO L134 CoverageAnalysis]: Checked inductivity of 6302 backedges. 4230 proven. 2070 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:49:34,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:35,744 INFO L134 CoverageAnalysis]: Checked inductivity of 6302 backedges. 4230 proven. 2070 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:49:35,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1607908706] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:35,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1133966579] [2022-12-14 08:49:35,745 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:49:35,745 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:35,745 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:35,745 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:35,745 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:35,828 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:36,568 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '108836#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:36,568 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:36,568 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:36,568 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [95, 94, 94] total 143 [2022-12-14 08:49:36,568 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635020569] [2022-12-14 08:49:36,568 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:36,569 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2022-12-14 08:49:36,569 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:36,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2022-12-14 08:49:36,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4683, Invalid=18269, Unknown=0, NotChecked=0, Total=22952 [2022-12-14 08:49:36,571 INFO L87 Difference]: Start difference. First operand 285 states and 287 transitions. Second operand has 143 states, 143 states have (on average 3.3286713286713288) internal successors, (476), 143 states have internal predecessors, (476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:38,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:38,633 INFO L93 Difference]: Finished difference Result 614 states and 663 transitions. [2022-12-14 08:49:38,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2022-12-14 08:49:38,633 INFO L78 Accepts]: Start accepts. Automaton has has 143 states, 143 states have (on average 3.3286713286713288) internal successors, (476), 143 states have internal predecessors, (476), 0 states have call successors, (0), 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 284 [2022-12-14 08:49:38,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:38,634 INFO L225 Difference]: With dead ends: 614 [2022-12-14 08:49:38,634 INFO L226 Difference]: Without dead ends: 425 [2022-12-14 08:49:38,636 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 991 GetRequests, 705 SyntacticMatches, 90 SemanticMatches, 196 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14953 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=9009, Invalid=29997, Unknown=0, NotChecked=0, Total=39006 [2022-12-14 08:49:38,636 INFO L413 NwaCegarLoop]: 94 mSDtfsCounter, 470 mSDsluCounter, 953 mSDsCounter, 0 mSdLazyCounter, 1102 mSolverCounterSat, 212 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 470 SdHoareTripleChecker+Valid, 1047 SdHoareTripleChecker+Invalid, 1314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 212 IncrementalHoareTripleChecker+Valid, 1102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:38,636 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [470 Valid, 1047 Invalid, 1314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [212 Valid, 1102 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 08:49:38,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 425 states. [2022-12-14 08:49:38,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 425 to 287. [2022-12-14 08:49:38,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 287 states, 286 states have (on average 1.0104895104895104) internal successors, (289), 286 states have internal predecessors, (289), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:38,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 287 states to 287 states and 289 transitions. [2022-12-14 08:49:38,673 INFO L78 Accepts]: Start accepts. Automaton has 287 states and 289 transitions. Word has length 284 [2022-12-14 08:49:38,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:38,673 INFO L495 AbstractCegarLoop]: Abstraction has 287 states and 289 transitions. [2022-12-14 08:49:38,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 143 states, 143 states have (on average 3.3286713286713288) internal successors, (476), 143 states have internal predecessors, (476), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:38,673 INFO L276 IsEmpty]: Start isEmpty. Operand 287 states and 289 transitions. [2022-12-14 08:49:38,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2022-12-14 08:49:38,674 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:38,674 INFO L195 NwaCegarLoop]: trace histogram [47, 47, 46, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:49:38,679 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Ended with exit code 0 [2022-12-14 08:49:38,875 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2022-12-14 08:49:38,875 INFO L420 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:38,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:38,876 INFO L85 PathProgramCache]: Analyzing trace with hash -1952277376, now seen corresponding path program 68 times [2022-12-14 08:49:38,876 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:38,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249734709] [2022-12-14 08:49:38,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:38,877 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:38,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:42,059 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 4097 proven. 2297 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:42,059 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:42,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249734709] [2022-12-14 08:49:42,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [249734709] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:42,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1310038218] [2022-12-14 08:49:42,059 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:49:42,059 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:42,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:42,060 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:42,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2022-12-14 08:49:42,296 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2022-12-14 08:49:42,296 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:49:42,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 1059 conjuncts, 96 conjunts are in the unsatisfiable core [2022-12-14 08:49:42,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:45,001 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 4232 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:45,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:46,745 INFO L134 CoverageAnalysis]: Checked inductivity of 6394 backedges. 4232 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:46,745 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1310038218] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:46,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1345625263] [2022-12-14 08:49:46,745 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:49:46,746 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:46,746 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:46,746 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:46,746 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:46,824 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:47,439 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '112114#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:47,439 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:47,439 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:47,439 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 145 [2022-12-14 08:49:47,440 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65881091] [2022-12-14 08:49:47,440 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:47,441 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 145 states [2022-12-14 08:49:47,441 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:47,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 145 interpolants. [2022-12-14 08:49:47,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4829, Invalid=18733, Unknown=0, NotChecked=0, Total=23562 [2022-12-14 08:49:47,444 INFO L87 Difference]: Start difference. First operand 287 states and 289 transitions. Second operand has 145 states, 145 states have (on average 3.296551724137931) internal successors, (478), 145 states have internal predecessors, (478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:49,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:49,823 INFO L93 Difference]: Finished difference Result 621 states and 671 transitions. [2022-12-14 08:49:49,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2022-12-14 08:49:49,823 INFO L78 Accepts]: Start accepts. Automaton has has 145 states, 145 states have (on average 3.296551724137931) internal successors, (478), 145 states have internal predecessors, (478), 0 states have call successors, (0), 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 286 [2022-12-14 08:49:49,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:49,825 INFO L225 Difference]: With dead ends: 621 [2022-12-14 08:49:49,825 INFO L226 Difference]: Without dead ends: 430 [2022-12-14 08:49:49,827 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 999 GetRequests, 708 SyntacticMatches, 92 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15364 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=9343, Invalid=30857, Unknown=0, NotChecked=0, Total=40200 [2022-12-14 08:49:49,828 INFO L413 NwaCegarLoop]: 96 mSDtfsCounter, 405 mSDsluCounter, 1079 mSDsCounter, 0 mSdLazyCounter, 1218 mSolverCounterSat, 181 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 405 SdHoareTripleChecker+Valid, 1175 SdHoareTripleChecker+Invalid, 1399 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 181 IncrementalHoareTripleChecker+Valid, 1218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:49,828 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [405 Valid, 1175 Invalid, 1399 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [181 Valid, 1218 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 08:49:49,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 430 states. [2022-12-14 08:49:49,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 430 to 289. [2022-12-14 08:49:49,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.0104166666666667) internal successors, (291), 288 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:49,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 291 transitions. [2022-12-14 08:49:49,868 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 291 transitions. Word has length 286 [2022-12-14 08:49:49,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:49,868 INFO L495 AbstractCegarLoop]: Abstraction has 289 states and 291 transitions. [2022-12-14 08:49:49,868 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 145 states, 145 states have (on average 3.296551724137931) internal successors, (478), 145 states have internal predecessors, (478), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:49,869 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 291 transitions. [2022-12-14 08:49:49,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2022-12-14 08:49:49,869 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:49,869 INFO L195 NwaCegarLoop]: trace histogram [48, 47, 47, 46, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:49:49,874 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Ended with exit code 0 [2022-12-14 08:49:50,070 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:50,070 INFO L420 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:50,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:50,071 INFO L85 PathProgramCache]: Analyzing trace with hash 143078181, now seen corresponding path program 69 times [2022-12-14 08:49:50,072 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:50,072 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [806907306] [2022-12-14 08:49:50,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:50,072 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:50,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:52,210 INFO L134 CoverageAnalysis]: Checked inductivity of 6488 backedges. 2162 proven. 4326 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:52,210 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:52,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [806907306] [2022-12-14 08:49:52,210 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [806907306] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:52,210 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [330433124] [2022-12-14 08:49:52,210 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:49:52,210 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:52,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:52,211 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:52,211 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2022-12-14 08:49:52,324 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:49:52,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:49:52,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 1069 conjuncts, 100 conjunts are in the unsatisfiable core [2022-12-14 08:49:52,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:49:52,553 INFO L134 CoverageAnalysis]: Checked inductivity of 6488 backedges. 2256 proven. 4232 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:52,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:49:53,689 INFO L134 CoverageAnalysis]: Checked inductivity of 6488 backedges. 2256 proven. 4232 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:53,689 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [330433124] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:49:53,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [77817280] [2022-12-14 08:49:53,690 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:49:53,690 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:49:53,690 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:49:53,690 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:49:53,690 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:49:53,764 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:49:54,106 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '115328#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:49:54,106 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:49:54,106 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:49:54,106 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 53 [2022-12-14 08:49:54,106 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690779012] [2022-12-14 08:49:54,106 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:49:54,106 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-12-14 08:49:54,106 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:49:54,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-12-14 08:49:54,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1327, Invalid=2579, Unknown=0, NotChecked=0, Total=3906 [2022-12-14 08:49:54,107 INFO L87 Difference]: Start difference. First operand 289 states and 291 transitions. Second operand has 54 states, 54 states have (on average 5.722222222222222) internal successors, (309), 53 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:54,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:49:54,815 INFO L93 Difference]: Finished difference Result 306 states and 309 transitions. [2022-12-14 08:49:54,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2022-12-14 08:49:54,815 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 5.722222222222222) internal successors, (309), 53 states have internal predecessors, (309), 0 states have call successors, (0), 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 288 [2022-12-14 08:49:54,816 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:49:54,816 INFO L225 Difference]: With dead ends: 306 [2022-12-14 08:49:54,816 INFO L226 Difference]: Without dead ends: 304 [2022-12-14 08:49:54,817 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1008 GetRequests, 805 SyntacticMatches, 92 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5884 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=3982, Invalid=8674, Unknown=0, NotChecked=0, Total=12656 [2022-12-14 08:49:54,817 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 300 mSDsluCounter, 375 mSDsCounter, 0 mSdLazyCounter, 500 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 431 SdHoareTripleChecker+Invalid, 504 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 500 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:49:54,817 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [300 Valid, 431 Invalid, 504 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 500 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:49:54,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2022-12-14 08:49:54,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 297. [2022-12-14 08:49:54,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 297 states, 296 states have (on average 1.010135135135135) internal successors, (299), 296 states have internal predecessors, (299), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:54,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 297 states to 297 states and 299 transitions. [2022-12-14 08:49:54,856 INFO L78 Accepts]: Start accepts. Automaton has 297 states and 299 transitions. Word has length 288 [2022-12-14 08:49:54,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:49:54,857 INFO L495 AbstractCegarLoop]: Abstraction has 297 states and 299 transitions. [2022-12-14 08:49:54,857 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 5.722222222222222) internal successors, (309), 53 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:49:54,857 INFO L276 IsEmpty]: Start isEmpty. Operand 297 states and 299 transitions. [2022-12-14 08:49:54,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 297 [2022-12-14 08:49:54,858 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:49:54,858 INFO L195 NwaCegarLoop]: trace histogram [49, 48, 48, 48, 48, 47, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:49:54,862 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Ended with exit code 0 [2022-12-14 08:49:55,058 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable71 [2022-12-14 08:49:55,059 INFO L420 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:49:55,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:49:55,060 INFO L85 PathProgramCache]: Analyzing trace with hash 1263833099, now seen corresponding path program 70 times [2022-12-14 08:49:55,060 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:49:55,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193992555] [2022-12-14 08:49:55,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:49:55,061 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:49:55,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:58,308 INFO L134 CoverageAnalysis]: Checked inductivity of 6864 backedges. 4467 proven. 2397 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:49:58,308 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:49:58,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193992555] [2022-12-14 08:49:58,308 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [193992555] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:49:58,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1890921754] [2022-12-14 08:49:58,308 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:49:58,308 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:49:58,308 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:49:58,309 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:49:58,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2022-12-14 08:49:58,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:49:58,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 1093 conjuncts, 98 conjunts are in the unsatisfiable core [2022-12-14 08:49:58,475 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:50:01,486 INFO L134 CoverageAnalysis]: Checked inductivity of 6864 backedges. 4606 proven. 2256 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:50:01,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:50:03,807 INFO L134 CoverageAnalysis]: Checked inductivity of 6864 backedges. 4606 proven. 2256 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:50:03,807 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1890921754] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:50:03,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1202035651] [2022-12-14 08:50:03,808 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:50:03,808 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:50:03,809 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:50:03,809 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:50:03,809 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:50:03,870 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:50:04,584 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '118254#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:50:04,584 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:50:04,584 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:50:04,584 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [99, 98, 98] total 149 [2022-12-14 08:50:04,584 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181043374] [2022-12-14 08:50:04,584 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:50:04,585 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 149 states [2022-12-14 08:50:04,585 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:50:04,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 149 interpolants. [2022-12-14 08:50:04,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5077, Invalid=19729, Unknown=0, NotChecked=0, Total=24806 [2022-12-14 08:50:04,587 INFO L87 Difference]: Start difference. First operand 297 states and 299 transitions. Second operand has 149 states, 149 states have (on average 3.3288590604026846) internal successors, (496), 149 states have internal predecessors, (496), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:06,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:50:06,646 INFO L93 Difference]: Finished difference Result 640 states and 691 transitions. [2022-12-14 08:50:06,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-12-14 08:50:06,646 INFO L78 Accepts]: Start accepts. Automaton has has 149 states, 149 states have (on average 3.3288590604026846) internal successors, (496), 149 states have internal predecessors, (496), 0 states have call successors, (0), 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 296 [2022-12-14 08:50:06,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:50:06,647 INFO L225 Difference]: With dead ends: 640 [2022-12-14 08:50:06,647 INFO L226 Difference]: Without dead ends: 443 [2022-12-14 08:50:06,649 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1033 GetRequests, 735 SyntacticMatches, 94 SemanticMatches, 204 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16179 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=9783, Invalid=32447, Unknown=0, NotChecked=0, Total=42230 [2022-12-14 08:50:06,649 INFO L413 NwaCegarLoop]: 98 mSDtfsCounter, 430 mSDsluCounter, 1239 mSDsCounter, 0 mSdLazyCounter, 1381 mSolverCounterSat, 191 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 430 SdHoareTripleChecker+Valid, 1337 SdHoareTripleChecker+Invalid, 1572 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 191 IncrementalHoareTripleChecker+Valid, 1381 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 08:50:06,649 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [430 Valid, 1337 Invalid, 1572 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [191 Valid, 1381 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 08:50:06,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2022-12-14 08:50:06,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 299. [2022-12-14 08:50:06,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 298 states have (on average 1.0100671140939597) internal successors, (301), 298 states have internal predecessors, (301), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:06,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 301 transitions. [2022-12-14 08:50:06,689 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 301 transitions. Word has length 296 [2022-12-14 08:50:06,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:50:06,689 INFO L495 AbstractCegarLoop]: Abstraction has 299 states and 301 transitions. [2022-12-14 08:50:06,689 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 149 states, 149 states have (on average 3.3288590604026846) internal successors, (496), 149 states have internal predecessors, (496), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:06,689 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 301 transitions. [2022-12-14 08:50:06,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2022-12-14 08:50:06,690 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:50:06,690 INFO L195 NwaCegarLoop]: trace histogram [49, 49, 48, 48, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:50:06,695 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Ended with exit code 0 [2022-12-14 08:50:06,891 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:06,891 INFO L420 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:50:06,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:50:06,892 INFO L85 PathProgramCache]: Analyzing trace with hash -212018064, now seen corresponding path program 71 times [2022-12-14 08:50:06,892 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:50:06,893 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [972522014] [2022-12-14 08:50:06,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:50:06,893 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:50:07,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:50:10,190 INFO L134 CoverageAnalysis]: Checked inductivity of 6960 backedges. 4467 proven. 2493 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:10,190 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:50:10,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [972522014] [2022-12-14 08:50:10,190 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [972522014] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:50:10,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1352754293] [2022-12-14 08:50:10,190 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:50:10,190 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:10,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:50:10,191 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:50:10,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2022-12-14 08:50:10,454 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 49 check-sat command(s) [2022-12-14 08:50:10,454 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:50:10,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 1103 conjuncts, 100 conjunts are in the unsatisfiable core [2022-12-14 08:50:10,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:50:13,057 INFO L134 CoverageAnalysis]: Checked inductivity of 6960 backedges. 4608 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:13,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:50:14,744 INFO L134 CoverageAnalysis]: Checked inductivity of 6960 backedges. 4608 proven. 2352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:14,744 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1352754293] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:50:14,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [7789469] [2022-12-14 08:50:14,745 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:50:14,745 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:50:14,745 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:50:14,745 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:50:14,745 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:50:14,836 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:50:15,488 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '121670#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:50:15,488 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:50:15,488 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:50:15,488 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 100, 100] total 151 [2022-12-14 08:50:15,488 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067687860] [2022-12-14 08:50:15,488 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:50:15,488 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 151 states [2022-12-14 08:50:15,489 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:50:15,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 151 interpolants. [2022-12-14 08:50:15,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5229, Invalid=20211, Unknown=0, NotChecked=0, Total=25440 [2022-12-14 08:50:15,491 INFO L87 Difference]: Start difference. First operand 299 states and 301 transitions. Second operand has 151 states, 151 states have (on average 3.2980132450331126) internal successors, (498), 151 states have internal predecessors, (498), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:18,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:50:18,076 INFO L93 Difference]: Finished difference Result 647 states and 699 transitions. [2022-12-14 08:50:18,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2022-12-14 08:50:18,076 INFO L78 Accepts]: Start accepts. Automaton has has 151 states, 151 states have (on average 3.2980132450331126) internal successors, (498), 151 states have internal predecessors, (498), 0 states have call successors, (0), 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 298 [2022-12-14 08:50:18,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:50:18,077 INFO L225 Difference]: With dead ends: 647 [2022-12-14 08:50:18,077 INFO L226 Difference]: Without dead ends: 448 [2022-12-14 08:50:18,079 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1041 GetRequests, 738 SyntacticMatches, 96 SemanticMatches, 207 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16606 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=10131, Invalid=33341, Unknown=0, NotChecked=0, Total=43472 [2022-12-14 08:50:18,079 INFO L413 NwaCegarLoop]: 100 mSDtfsCounter, 479 mSDsluCounter, 1091 mSDsCounter, 0 mSdLazyCounter, 1244 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 479 SdHoareTripleChecker+Valid, 1191 SdHoareTripleChecker+Invalid, 1459 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 1244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 08:50:18,079 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [479 Valid, 1191 Invalid, 1459 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 1244 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 08:50:18,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 448 states. [2022-12-14 08:50:18,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 448 to 301. [2022-12-14 08:50:18,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 301 states, 300 states have (on average 1.01) internal successors, (303), 300 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:18,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 301 states to 301 states and 303 transitions. [2022-12-14 08:50:18,120 INFO L78 Accepts]: Start accepts. Automaton has 301 states and 303 transitions. Word has length 298 [2022-12-14 08:50:18,120 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:50:18,120 INFO L495 AbstractCegarLoop]: Abstraction has 301 states and 303 transitions. [2022-12-14 08:50:18,120 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 151 states, 151 states have (on average 3.2980132450331126) internal successors, (498), 151 states have internal predecessors, (498), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:18,120 INFO L276 IsEmpty]: Start isEmpty. Operand 301 states and 303 transitions. [2022-12-14 08:50:18,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2022-12-14 08:50:18,121 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:50:18,121 INFO L195 NwaCegarLoop]: trace histogram [50, 49, 49, 48, 48, 48, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:50:18,126 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Forceful destruction successful, exit code 0 [2022-12-14 08:50:18,321 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:18,322 INFO L420 AbstractCegarLoop]: === Iteration 75 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:50:18,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:50:18,323 INFO L85 PathProgramCache]: Analyzing trace with hash -1165778027, now seen corresponding path program 72 times [2022-12-14 08:50:18,323 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:50:18,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1863445769] [2022-12-14 08:50:18,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:50:18,324 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:50:18,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:50:20,595 INFO L134 CoverageAnalysis]: Checked inductivity of 7058 backedges. 2352 proven. 4706 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:20,595 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:50:20,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1863445769] [2022-12-14 08:50:20,595 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1863445769] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:50:20,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1912451458] [2022-12-14 08:50:20,595 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:50:20,596 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:20,596 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:50:20,596 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:50:20,597 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2022-12-14 08:50:20,762 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:50:20,762 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:50:20,768 INFO L263 TraceCheckSpWp]: Trace formula consists of 1113 conjuncts, 104 conjunts are in the unsatisfiable core [2022-12-14 08:50:20,771 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:50:20,969 INFO L134 CoverageAnalysis]: Checked inductivity of 7058 backedges. 2450 proven. 4608 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:20,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:50:22,090 INFO L134 CoverageAnalysis]: Checked inductivity of 7058 backedges. 2450 proven. 4608 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:22,091 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1912451458] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:50:22,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [991595964] [2022-12-14 08:50:22,091 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:50:22,091 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:50:22,091 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:50:22,092 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:50:22,092 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:50:22,177 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:50:22,592 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '125018#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:50:22,592 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:50:22,592 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:50:22,592 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 55 [2022-12-14 08:50:22,592 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502258520] [2022-12-14 08:50:22,593 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:50:22,593 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-12-14 08:50:22,593 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:50:22,594 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-12-14 08:50:22,594 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1430, Invalid=2730, Unknown=0, NotChecked=0, Total=4160 [2022-12-14 08:50:22,595 INFO L87 Difference]: Start difference. First operand 301 states and 303 transitions. Second operand has 56 states, 56 states have (on average 5.732142857142857) internal successors, (321), 55 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:23,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:50:23,570 INFO L93 Difference]: Finished difference Result 318 states and 321 transitions. [2022-12-14 08:50:23,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2022-12-14 08:50:23,570 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 5.732142857142857) internal successors, (321), 55 states have internal predecessors, (321), 0 states have call successors, (0), 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 300 [2022-12-14 08:50:23,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:50:23,571 INFO L225 Difference]: With dead ends: 318 [2022-12-14 08:50:23,571 INFO L226 Difference]: Without dead ends: 316 [2022-12-14 08:50:23,571 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1050 GetRequests, 839 SyntacticMatches, 96 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6328 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=4295, Invalid=9277, Unknown=0, NotChecked=0, Total=13572 [2022-12-14 08:50:23,571 INFO L413 NwaCegarLoop]: 58 mSDtfsCounter, 161 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 518 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 445 SdHoareTripleChecker+Invalid, 522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 518 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:50:23,572 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 445 Invalid, 522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 518 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:50:23,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 316 states. [2022-12-14 08:50:23,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 316 to 309. [2022-12-14 08:50:23,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 309 states, 308 states have (on average 1.0097402597402598) internal successors, (311), 308 states have internal predecessors, (311), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:23,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 309 states to 309 states and 311 transitions. [2022-12-14 08:50:23,613 INFO L78 Accepts]: Start accepts. Automaton has 309 states and 311 transitions. Word has length 300 [2022-12-14 08:50:23,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:50:23,613 INFO L495 AbstractCegarLoop]: Abstraction has 309 states and 311 transitions. [2022-12-14 08:50:23,613 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 5.732142857142857) internal successors, (321), 55 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:23,613 INFO L276 IsEmpty]: Start isEmpty. Operand 309 states and 311 transitions. [2022-12-14 08:50:23,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 309 [2022-12-14 08:50:23,614 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:50:23,614 INFO L195 NwaCegarLoop]: trace histogram [51, 50, 50, 50, 50, 49, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:50:23,620 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Forceful destruction successful, exit code 0 [2022-12-14 08:50:23,815 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable74,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:23,816 INFO L420 AbstractCegarLoop]: === Iteration 76 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:50:23,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:50:23,817 INFO L85 PathProgramCache]: Analyzing trace with hash 265392251, now seen corresponding path program 73 times [2022-12-14 08:50:23,817 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:50:23,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [304070414] [2022-12-14 08:50:23,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:50:23,818 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:50:23,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:50:27,506 INFO L134 CoverageAnalysis]: Checked inductivity of 7450 backedges. 4853 proven. 2597 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:27,506 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:50:27,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [304070414] [2022-12-14 08:50:27,506 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [304070414] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:50:27,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1674175815] [2022-12-14 08:50:27,506 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:50:27,506 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:27,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:50:27,507 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:50:27,508 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2022-12-14 08:50:27,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:50:27,617 INFO L263 TraceCheckSpWp]: Trace formula consists of 1137 conjuncts, 102 conjunts are in the unsatisfiable core [2022-12-14 08:50:27,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:50:30,642 INFO L134 CoverageAnalysis]: Checked inductivity of 7450 backedges. 4998 proven. 2450 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:50:30,642 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:50:32,621 INFO L134 CoverageAnalysis]: Checked inductivity of 7450 backedges. 4998 proven. 2450 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:50:32,621 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1674175815] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:50:32,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1894552929] [2022-12-14 08:50:32,622 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:50:32,622 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:50:32,622 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:50:32,622 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:50:32,622 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:50:32,689 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:50:33,573 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '128062#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:50:33,574 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:50:33,574 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:50:33,574 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [103, 102, 102] total 155 [2022-12-14 08:50:33,574 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1350411243] [2022-12-14 08:50:33,574 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:50:33,575 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 155 states [2022-12-14 08:50:33,575 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:50:33,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 155 interpolants. [2022-12-14 08:50:33,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5487, Invalid=21245, Unknown=0, NotChecked=0, Total=26732 [2022-12-14 08:50:33,578 INFO L87 Difference]: Start difference. First operand 309 states and 311 transitions. Second operand has 155 states, 155 states have (on average 3.329032258064516) internal successors, (516), 155 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:36,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:50:36,680 INFO L93 Difference]: Finished difference Result 666 states and 719 transitions. [2022-12-14 08:50:36,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2022-12-14 08:50:36,680 INFO L78 Accepts]: Start accepts. Automaton has has 155 states, 155 states have (on average 3.329032258064516) internal successors, (516), 155 states have internal predecessors, (516), 0 states have call successors, (0), 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 308 [2022-12-14 08:50:36,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:50:36,682 INFO L225 Difference]: With dead ends: 666 [2022-12-14 08:50:36,682 INFO L226 Difference]: Without dead ends: 461 [2022-12-14 08:50:36,685 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1075 GetRequests, 765 SyntacticMatches, 98 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17453 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=10589, Invalid=34993, Unknown=0, NotChecked=0, Total=45582 [2022-12-14 08:50:36,685 INFO L413 NwaCegarLoop]: 102 mSDtfsCounter, 440 mSDsluCounter, 1195 mSDsCounter, 0 mSdLazyCounter, 1353 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 440 SdHoareTripleChecker+Valid, 1297 SdHoareTripleChecker+Invalid, 1549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 1353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 08:50:36,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [440 Valid, 1297 Invalid, 1549 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 1353 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 08:50:36,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2022-12-14 08:50:36,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 311. [2022-12-14 08:50:36,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 311 states, 310 states have (on average 1.0096774193548388) internal successors, (313), 310 states have internal predecessors, (313), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:36,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 311 states to 311 states and 313 transitions. [2022-12-14 08:50:36,738 INFO L78 Accepts]: Start accepts. Automaton has 311 states and 313 transitions. Word has length 308 [2022-12-14 08:50:36,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:50:36,738 INFO L495 AbstractCegarLoop]: Abstraction has 311 states and 313 transitions. [2022-12-14 08:50:36,738 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 155 states, 155 states have (on average 3.329032258064516) internal successors, (516), 155 states have internal predecessors, (516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:36,738 INFO L276 IsEmpty]: Start isEmpty. Operand 311 states and 313 transitions. [2022-12-14 08:50:36,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 311 [2022-12-14 08:50:36,739 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:50:36,739 INFO L195 NwaCegarLoop]: trace histogram [51, 51, 50, 50, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:50:36,744 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Forceful destruction successful, exit code 0 [2022-12-14 08:50:36,939 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:36,940 INFO L420 AbstractCegarLoop]: === Iteration 77 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:50:36,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:50:36,941 INFO L85 PathProgramCache]: Analyzing trace with hash -344363680, now seen corresponding path program 74 times [2022-12-14 08:50:36,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:50:36,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [775955064] [2022-12-14 08:50:36,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:50:36,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:50:37,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:50:41,441 INFO L134 CoverageAnalysis]: Checked inductivity of 7550 backedges. 4853 proven. 2697 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:41,442 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:50:41,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [775955064] [2022-12-14 08:50:41,442 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [775955064] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:50:41,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1717296644] [2022-12-14 08:50:41,442 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:50:41,442 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:41,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:50:41,443 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:50:41,444 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2022-12-14 08:50:41,701 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 51 check-sat command(s) [2022-12-14 08:50:41,701 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:50:41,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 1147 conjuncts, 104 conjunts are in the unsatisfiable core [2022-12-14 08:50:41,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:50:44,814 INFO L134 CoverageAnalysis]: Checked inductivity of 7550 backedges. 5000 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:44,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:50:47,098 INFO L134 CoverageAnalysis]: Checked inductivity of 7550 backedges. 5000 proven. 2550 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:47,098 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1717296644] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:50:47,098 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [427473598] [2022-12-14 08:50:47,099 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:50:47,099 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:50:47,099 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:50:47,099 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:50:47,100 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:50:47,166 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:50:47,931 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '131616#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:50:47,932 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:50:47,932 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:50:47,932 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [104, 104, 104] total 157 [2022-12-14 08:50:47,932 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936304123] [2022-12-14 08:50:47,932 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:50:47,933 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 157 states [2022-12-14 08:50:47,933 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:50:47,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 157 interpolants. [2022-12-14 08:50:47,936 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5645, Invalid=21745, Unknown=0, NotChecked=0, Total=27390 [2022-12-14 08:50:47,936 INFO L87 Difference]: Start difference. First operand 311 states and 313 transitions. Second operand has 157 states, 157 states have (on average 3.299363057324841) internal successors, (518), 157 states have internal predecessors, (518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:50,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:50:50,505 INFO L93 Difference]: Finished difference Result 673 states and 727 transitions. [2022-12-14 08:50:50,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2022-12-14 08:50:50,506 INFO L78 Accepts]: Start accepts. Automaton has has 157 states, 157 states have (on average 3.299363057324841) internal successors, (518), 157 states have internal predecessors, (518), 0 states have call successors, (0), 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 310 [2022-12-14 08:50:50,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:50:50,508 INFO L225 Difference]: With dead ends: 673 [2022-12-14 08:50:50,508 INFO L226 Difference]: Without dead ends: 466 [2022-12-14 08:50:50,510 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1083 GetRequests, 768 SyntacticMatches, 100 SemanticMatches, 215 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17896 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=10951, Invalid=35921, Unknown=0, NotChecked=0, Total=46872 [2022-12-14 08:50:50,510 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 562 mSDsluCounter, 1160 mSDsCounter, 0 mSdLazyCounter, 1329 mSolverCounterSat, 257 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 562 SdHoareTripleChecker+Valid, 1264 SdHoareTripleChecker+Invalid, 1586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 257 IncrementalHoareTripleChecker+Valid, 1329 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 08:50:50,511 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [562 Valid, 1264 Invalid, 1586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [257 Valid, 1329 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 08:50:50,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 466 states. [2022-12-14 08:50:50,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 466 to 313. [2022-12-14 08:50:50,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 313 states, 312 states have (on average 1.0096153846153846) internal successors, (315), 312 states have internal predecessors, (315), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:50,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 315 transitions. [2022-12-14 08:50:50,556 INFO L78 Accepts]: Start accepts. Automaton has 313 states and 315 transitions. Word has length 310 [2022-12-14 08:50:50,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:50:50,556 INFO L495 AbstractCegarLoop]: Abstraction has 313 states and 315 transitions. [2022-12-14 08:50:50,556 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 157 states, 157 states have (on average 3.299363057324841) internal successors, (518), 157 states have internal predecessors, (518), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:50,556 INFO L276 IsEmpty]: Start isEmpty. Operand 313 states and 315 transitions. [2022-12-14 08:50:50,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 313 [2022-12-14 08:50:50,557 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:50:50,557 INFO L195 NwaCegarLoop]: trace histogram [52, 51, 51, 50, 50, 50, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:50:50,562 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Ended with exit code 0 [2022-12-14 08:50:50,758 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable76 [2022-12-14 08:50:50,758 INFO L420 AbstractCegarLoop]: === Iteration 78 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:50:50,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:50:50,759 INFO L85 PathProgramCache]: Analyzing trace with hash 2090706181, now seen corresponding path program 75 times [2022-12-14 08:50:50,759 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:50:50,759 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617040881] [2022-12-14 08:50:50,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:50:50,760 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:50:50,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:50:53,268 INFO L134 CoverageAnalysis]: Checked inductivity of 7652 backedges. 2550 proven. 5102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:53,268 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:50:53,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617040881] [2022-12-14 08:50:53,269 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1617040881] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:50:53,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [340041052] [2022-12-14 08:50:53,269 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:50:53,269 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:50:53,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:50:53,270 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:50:53,270 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2022-12-14 08:50:53,442 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:50:53,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:50:53,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 1157 conjuncts, 108 conjunts are in the unsatisfiable core [2022-12-14 08:50:53,451 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:50:53,662 INFO L134 CoverageAnalysis]: Checked inductivity of 7652 backedges. 2652 proven. 5000 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:53,662 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:50:54,930 INFO L134 CoverageAnalysis]: Checked inductivity of 7652 backedges. 2652 proven. 5000 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:50:54,930 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [340041052] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:50:54,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1739556999] [2022-12-14 08:50:54,931 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:50:54,931 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:50:54,931 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:50:54,932 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:50:54,932 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:50:55,005 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:50:55,367 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '135098#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:50:55,367 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:50:55,367 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:50:55,367 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54] total 57 [2022-12-14 08:50:55,367 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [804083710] [2022-12-14 08:50:55,367 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:50:55,368 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2022-12-14 08:50:55,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:50:55,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2022-12-14 08:50:55,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1537, Invalid=2885, Unknown=0, NotChecked=0, Total=4422 [2022-12-14 08:50:55,369 INFO L87 Difference]: Start difference. First operand 313 states and 315 transitions. Second operand has 58 states, 58 states have (on average 5.741379310344827) internal successors, (333), 57 states have internal predecessors, (333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:56,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:50:56,309 INFO L93 Difference]: Finished difference Result 330 states and 333 transitions. [2022-12-14 08:50:56,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2022-12-14 08:50:56,309 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 5.741379310344827) internal successors, (333), 57 states have internal predecessors, (333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 312 [2022-12-14 08:50:56,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:50:56,310 INFO L225 Difference]: With dead ends: 330 [2022-12-14 08:50:56,310 INFO L226 Difference]: Without dead ends: 328 [2022-12-14 08:50:56,311 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1092 GetRequests, 873 SyntacticMatches, 100 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6788 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=4620, Invalid=9900, Unknown=0, NotChecked=0, Total=14520 [2022-12-14 08:50:56,311 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 171 mSDsluCounter, 457 mSDsCounter, 0 mSdLazyCounter, 598 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 517 SdHoareTripleChecker+Invalid, 602 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:50:56,311 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [171 Valid, 517 Invalid, 602 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 598 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:50:56,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 328 states. [2022-12-14 08:50:56,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 328 to 321. [2022-12-14 08:50:56,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 321 states, 320 states have (on average 1.009375) internal successors, (323), 320 states have internal predecessors, (323), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:56,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 321 states to 321 states and 323 transitions. [2022-12-14 08:50:56,357 INFO L78 Accepts]: Start accepts. Automaton has 321 states and 323 transitions. Word has length 312 [2022-12-14 08:50:56,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:50:56,357 INFO L495 AbstractCegarLoop]: Abstraction has 321 states and 323 transitions. [2022-12-14 08:50:56,357 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 5.741379310344827) internal successors, (333), 57 states have internal predecessors, (333), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:50:56,357 INFO L276 IsEmpty]: Start isEmpty. Operand 321 states and 323 transitions. [2022-12-14 08:50:56,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2022-12-14 08:50:56,358 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:50:56,358 INFO L195 NwaCegarLoop]: trace histogram [53, 52, 52, 52, 52, 51, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:50:56,363 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Ended with exit code 0 [2022-12-14 08:50:56,559 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable77 [2022-12-14 08:50:56,559 INFO L420 AbstractCegarLoop]: === Iteration 79 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:50:56,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:50:56,560 INFO L85 PathProgramCache]: Analyzing trace with hash 978002411, now seen corresponding path program 76 times [2022-12-14 08:50:56,561 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:50:56,561 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063258262] [2022-12-14 08:50:56,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:50:56,562 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:50:56,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:51:00,818 INFO L134 CoverageAnalysis]: Checked inductivity of 8060 backedges. 5255 proven. 2805 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:00,819 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:51:00,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2063258262] [2022-12-14 08:51:00,819 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2063258262] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:51:00,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2024309390] [2022-12-14 08:51:00,819 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:51:00,819 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:51:00,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:51:00,820 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:51:00,820 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2022-12-14 08:51:00,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:51:00,931 INFO L263 TraceCheckSpWp]: Trace formula consists of 1181 conjuncts, 106 conjunts are in the unsatisfiable core [2022-12-14 08:51:00,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:51:04,428 INFO L134 CoverageAnalysis]: Checked inductivity of 8060 backedges. 5406 proven. 2652 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:51:04,428 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:51:06,923 INFO L134 CoverageAnalysis]: Checked inductivity of 8060 backedges. 5406 proven. 2652 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:51:06,923 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2024309390] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:51:06,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [740574129] [2022-12-14 08:51:06,924 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:51:06,924 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:51:06,924 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:51:06,924 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:51:06,924 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:51:06,984 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:51:07,789 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '138260#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:51:07,789 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:51:07,790 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:51:07,790 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [107, 106, 106] total 161 [2022-12-14 08:51:07,790 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1915680317] [2022-12-14 08:51:07,790 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:51:07,791 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 161 states [2022-12-14 08:51:07,791 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:51:07,792 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 161 interpolants. [2022-12-14 08:51:07,794 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5913, Invalid=22817, Unknown=0, NotChecked=0, Total=28730 [2022-12-14 08:51:07,794 INFO L87 Difference]: Start difference. First operand 321 states and 323 transitions. Second operand has 161 states, 161 states have (on average 3.329192546583851) internal successors, (536), 161 states have internal predecessors, (536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:10,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:51:10,330 INFO L93 Difference]: Finished difference Result 692 states and 747 transitions. [2022-12-14 08:51:10,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2022-12-14 08:51:10,331 INFO L78 Accepts]: Start accepts. Automaton has has 161 states, 161 states have (on average 3.329192546583851) internal successors, (536), 161 states have internal predecessors, (536), 0 states have call successors, (0), 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 320 [2022-12-14 08:51:10,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:51:10,332 INFO L225 Difference]: With dead ends: 692 [2022-12-14 08:51:10,332 INFO L226 Difference]: Without dead ends: 479 [2022-12-14 08:51:10,334 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1117 GetRequests, 795 SyntacticMatches, 102 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18775 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=11427, Invalid=37635, Unknown=0, NotChecked=0, Total=49062 [2022-12-14 08:51:10,334 INFO L413 NwaCegarLoop]: 106 mSDtfsCounter, 541 mSDsluCounter, 1038 mSDsCounter, 0 mSdLazyCounter, 1207 mSolverCounterSat, 246 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 541 SdHoareTripleChecker+Valid, 1144 SdHoareTripleChecker+Invalid, 1453 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 246 IncrementalHoareTripleChecker+Valid, 1207 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 08:51:10,334 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [541 Valid, 1144 Invalid, 1453 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [246 Valid, 1207 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 08:51:10,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 479 states. [2022-12-14 08:51:10,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 479 to 323. [2022-12-14 08:51:10,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 323 states, 322 states have (on average 1.0093167701863355) internal successors, (325), 322 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:10,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 323 states to 323 states and 325 transitions. [2022-12-14 08:51:10,381 INFO L78 Accepts]: Start accepts. Automaton has 323 states and 325 transitions. Word has length 320 [2022-12-14 08:51:10,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:51:10,381 INFO L495 AbstractCegarLoop]: Abstraction has 323 states and 325 transitions. [2022-12-14 08:51:10,381 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 161 states, 161 states have (on average 3.329192546583851) internal successors, (536), 161 states have internal predecessors, (536), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:10,381 INFO L276 IsEmpty]: Start isEmpty. Operand 323 states and 325 transitions. [2022-12-14 08:51:10,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 323 [2022-12-14 08:51:10,382 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:51:10,382 INFO L195 NwaCegarLoop]: trace histogram [53, 53, 52, 52, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:51:10,387 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Ended with exit code 0 [2022-12-14 08:51:10,583 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable78,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:51:10,583 INFO L420 AbstractCegarLoop]: === Iteration 80 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:51:10,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:51:10,584 INFO L85 PathProgramCache]: Analyzing trace with hash -935473328, now seen corresponding path program 77 times [2022-12-14 08:51:10,585 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:51:10,585 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [60319496] [2022-12-14 08:51:10,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:51:10,585 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:51:10,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:51:15,162 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 5255 proven. 2909 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:15,162 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:51:15,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [60319496] [2022-12-14 08:51:15,162 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [60319496] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:51:15,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1626350996] [2022-12-14 08:51:15,162 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:51:15,162 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:51:15,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:51:15,163 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:51:15,164 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2022-12-14 08:51:15,498 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 53 check-sat command(s) [2022-12-14 08:51:15,498 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:51:15,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 1191 conjuncts, 108 conjunts are in the unsatisfiable core [2022-12-14 08:51:15,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:51:18,470 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 5408 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:18,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:51:20,719 INFO L134 CoverageAnalysis]: Checked inductivity of 8164 backedges. 5408 proven. 2756 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:20,719 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1626350996] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:51:20,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1071472379] [2022-12-14 08:51:20,720 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:51:20,720 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:51:20,720 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:51:20,720 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:51:20,720 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:51:20,785 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:51:21,554 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '141952#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:51:21,554 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:51:21,554 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:51:21,554 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [108, 108, 108] total 163 [2022-12-14 08:51:21,554 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849454440] [2022-12-14 08:51:21,554 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:51:21,555 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 163 states [2022-12-14 08:51:21,555 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:51:21,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 163 interpolants. [2022-12-14 08:51:21,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6077, Invalid=23335, Unknown=0, NotChecked=0, Total=29412 [2022-12-14 08:51:21,557 INFO L87 Difference]: Start difference. First operand 323 states and 325 transitions. Second operand has 163 states, 163 states have (on average 3.3006134969325154) internal successors, (538), 163 states have internal predecessors, (538), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:24,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:51:24,641 INFO L93 Difference]: Finished difference Result 699 states and 755 transitions. [2022-12-14 08:51:24,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2022-12-14 08:51:24,641 INFO L78 Accepts]: Start accepts. Automaton has has 163 states, 163 states have (on average 3.3006134969325154) internal successors, (538), 163 states have internal predecessors, (538), 0 states have call successors, (0), 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 322 [2022-12-14 08:51:24,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:51:24,644 INFO L225 Difference]: With dead ends: 699 [2022-12-14 08:51:24,644 INFO L226 Difference]: Without dead ends: 484 [2022-12-14 08:51:24,646 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1125 GetRequests, 798 SyntacticMatches, 104 SemanticMatches, 223 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19234 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=11803, Invalid=38597, Unknown=0, NotChecked=0, Total=50400 [2022-12-14 08:51:24,646 INFO L413 NwaCegarLoop]: 108 mSDtfsCounter, 591 mSDsluCounter, 1113 mSDsCounter, 0 mSdLazyCounter, 1284 mSolverCounterSat, 271 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 591 SdHoareTripleChecker+Valid, 1221 SdHoareTripleChecker+Invalid, 1555 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 271 IncrementalHoareTripleChecker+Valid, 1284 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 08:51:24,646 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [591 Valid, 1221 Invalid, 1555 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [271 Valid, 1284 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 08:51:24,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 484 states. [2022-12-14 08:51:24,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 484 to 325. [2022-12-14 08:51:24,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 325 states, 324 states have (on average 1.0092592592592593) internal successors, (327), 324 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:24,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 325 states to 325 states and 327 transitions. [2022-12-14 08:51:24,695 INFO L78 Accepts]: Start accepts. Automaton has 325 states and 327 transitions. Word has length 322 [2022-12-14 08:51:24,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:51:24,695 INFO L495 AbstractCegarLoop]: Abstraction has 325 states and 327 transitions. [2022-12-14 08:51:24,695 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 163 states, 163 states have (on average 3.3006134969325154) internal successors, (538), 163 states have internal predecessors, (538), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:24,695 INFO L276 IsEmpty]: Start isEmpty. Operand 325 states and 327 transitions. [2022-12-14 08:51:24,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 325 [2022-12-14 08:51:24,696 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:51:24,696 INFO L195 NwaCegarLoop]: trace histogram [54, 53, 53, 52, 52, 52, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:51:24,701 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Ended with exit code 0 [2022-12-14 08:51:24,897 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable79 [2022-12-14 08:51:24,897 INFO L420 AbstractCegarLoop]: === Iteration 81 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:51:24,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:51:24,898 INFO L85 PathProgramCache]: Analyzing trace with hash -1539655819, now seen corresponding path program 78 times [2022-12-14 08:51:24,899 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:51:24,899 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [97068203] [2022-12-14 08:51:24,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:51:24,899 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:51:25,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:51:27,852 INFO L134 CoverageAnalysis]: Checked inductivity of 8270 backedges. 2756 proven. 5514 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:27,852 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:51:27,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [97068203] [2022-12-14 08:51:27,853 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [97068203] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:51:27,853 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1902851768] [2022-12-14 08:51:27,853 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:51:27,853 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:51:27,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:51:27,854 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:51:27,855 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2022-12-14 08:51:27,995 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:51:27,995 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:51:28,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 1201 conjuncts, 112 conjunts are in the unsatisfiable core [2022-12-14 08:51:28,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:51:28,218 INFO L134 CoverageAnalysis]: Checked inductivity of 8270 backedges. 2862 proven. 5408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:28,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:51:29,631 INFO L134 CoverageAnalysis]: Checked inductivity of 8270 backedges. 2862 proven. 5408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:29,631 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1902851768] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:51:29,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1054244220] [2022-12-14 08:51:29,632 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:51:29,632 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:51:29,632 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:51:29,632 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:51:29,632 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:51:29,700 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:51:30,114 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '145568#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:51:30,114 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:51:30,114 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:51:30,114 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 56, 56] total 59 [2022-12-14 08:51:30,114 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1823422916] [2022-12-14 08:51:30,114 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:51:30,115 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2022-12-14 08:51:30,115 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:51:30,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2022-12-14 08:51:30,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1648, Invalid=3044, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 08:51:30,117 INFO L87 Difference]: Start difference. First operand 325 states and 327 transitions. Second operand has 60 states, 60 states have (on average 5.75) internal successors, (345), 59 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:31,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:51:31,064 INFO L93 Difference]: Finished difference Result 342 states and 345 transitions. [2022-12-14 08:51:31,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2022-12-14 08:51:31,064 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 5.75) internal successors, (345), 59 states have internal predecessors, (345), 0 states have call successors, (0), 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 324 [2022-12-14 08:51:31,064 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:51:31,066 INFO L225 Difference]: With dead ends: 342 [2022-12-14 08:51:31,066 INFO L226 Difference]: Without dead ends: 340 [2022-12-14 08:51:31,067 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1134 GetRequests, 907 SyntacticMatches, 104 SemanticMatches, 123 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7264 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=4957, Invalid=10543, Unknown=0, NotChecked=0, Total=15500 [2022-12-14 08:51:31,067 INFO L413 NwaCegarLoop]: 62 mSDtfsCounter, 174 mSDsluCounter, 466 mSDsCounter, 0 mSdLazyCounter, 609 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 528 SdHoareTripleChecker+Invalid, 613 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:51:31,067 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [174 Valid, 528 Invalid, 613 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 609 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:51:31,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2022-12-14 08:51:31,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 333. [2022-12-14 08:51:31,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 333 states, 332 states have (on average 1.0090361445783131) internal successors, (335), 332 states have internal predecessors, (335), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:31,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 335 transitions. [2022-12-14 08:51:31,117 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 335 transitions. Word has length 324 [2022-12-14 08:51:31,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:51:31,117 INFO L495 AbstractCegarLoop]: Abstraction has 333 states and 335 transitions. [2022-12-14 08:51:31,117 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 5.75) internal successors, (345), 59 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:31,117 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 335 transitions. [2022-12-14 08:51:31,123 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 333 [2022-12-14 08:51:31,123 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:51:31,123 INFO L195 NwaCegarLoop]: trace histogram [55, 54, 54, 54, 54, 53, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:51:31,128 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Forceful destruction successful, exit code 0 [2022-12-14 08:51:31,323 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:51:31,324 INFO L420 AbstractCegarLoop]: === Iteration 82 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:51:31,325 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:51:31,325 INFO L85 PathProgramCache]: Analyzing trace with hash 581354587, now seen corresponding path program 79 times [2022-12-14 08:51:31,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:51:31,326 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [525923657] [2022-12-14 08:51:31,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:51:31,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:51:31,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:51:35,571 INFO L134 CoverageAnalysis]: Checked inductivity of 8694 backedges. 5673 proven. 3021 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:35,571 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:51:35,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [525923657] [2022-12-14 08:51:35,571 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [525923657] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:51:35,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [331576717] [2022-12-14 08:51:35,571 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:51:35,571 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:51:35,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:51:35,572 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:51:35,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2022-12-14 08:51:35,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:51:35,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 1225 conjuncts, 110 conjunts are in the unsatisfiable core [2022-12-14 08:51:35,704 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:51:38,682 INFO L134 CoverageAnalysis]: Checked inductivity of 8694 backedges. 5830 proven. 2862 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:51:38,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:51:40,768 INFO L134 CoverageAnalysis]: Checked inductivity of 8694 backedges. 5830 proven. 2862 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:51:40,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [331576717] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:51:40,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1229538259] [2022-12-14 08:51:40,769 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:51:40,769 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:51:40,769 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:51:40,769 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:51:40,769 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:51:40,839 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:51:41,785 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '148848#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:51:41,785 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:51:41,786 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:51:41,786 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [111, 110, 110] total 167 [2022-12-14 08:51:41,786 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433438564] [2022-12-14 08:51:41,786 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:51:41,786 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 167 states [2022-12-14 08:51:41,786 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:51:41,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 167 interpolants. [2022-12-14 08:51:41,789 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6355, Invalid=24445, Unknown=0, NotChecked=0, Total=30800 [2022-12-14 08:51:41,789 INFO L87 Difference]: Start difference. First operand 333 states and 335 transitions. Second operand has 167 states, 167 states have (on average 3.3293413173652695) internal successors, (556), 167 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:45,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:51:45,070 INFO L93 Difference]: Finished difference Result 718 states and 775 transitions. [2022-12-14 08:51:45,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 110 states. [2022-12-14 08:51:45,070 INFO L78 Accepts]: Start accepts. Automaton has has 167 states, 167 states have (on average 3.3293413173652695) internal successors, (556), 167 states have internal predecessors, (556), 0 states have call successors, (0), 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 332 [2022-12-14 08:51:45,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:51:45,073 INFO L225 Difference]: With dead ends: 718 [2022-12-14 08:51:45,073 INFO L226 Difference]: Without dead ends: 497 [2022-12-14 08:51:45,076 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1159 GetRequests, 825 SyntacticMatches, 106 SemanticMatches, 228 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20145 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=12297, Invalid=40373, Unknown=0, NotChecked=0, Total=52670 [2022-12-14 08:51:45,076 INFO L413 NwaCegarLoop]: 110 mSDtfsCounter, 583 mSDsluCounter, 1150 mSDsCounter, 0 mSdLazyCounter, 1324 mSolverCounterSat, 266 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 583 SdHoareTripleChecker+Valid, 1260 SdHoareTripleChecker+Invalid, 1590 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 266 IncrementalHoareTripleChecker+Valid, 1324 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 08:51:45,076 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [583 Valid, 1260 Invalid, 1590 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [266 Valid, 1324 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 08:51:45,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 497 states. [2022-12-14 08:51:45,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 497 to 335. [2022-12-14 08:51:45,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 334 states have (on average 1.0089820359281436) internal successors, (337), 334 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:45,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 337 transitions. [2022-12-14 08:51:45,132 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 337 transitions. Word has length 332 [2022-12-14 08:51:45,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:51:45,133 INFO L495 AbstractCegarLoop]: Abstraction has 335 states and 337 transitions. [2022-12-14 08:51:45,133 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 167 states, 167 states have (on average 3.3293413173652695) internal successors, (556), 167 states have internal predecessors, (556), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:51:45,133 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 337 transitions. [2022-12-14 08:51:45,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2022-12-14 08:51:45,134 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:51:45,134 INFO L195 NwaCegarLoop]: trace histogram [55, 55, 54, 54, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:51:45,139 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Forceful destruction successful, exit code 0 [2022-12-14 08:51:45,334 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:51:45,335 INFO L420 AbstractCegarLoop]: === Iteration 83 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:51:45,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:51:45,336 INFO L85 PathProgramCache]: Analyzing trace with hash -89161152, now seen corresponding path program 80 times [2022-12-14 08:51:45,336 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:51:45,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [720543922] [2022-12-14 08:51:45,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:51:45,337 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:51:45,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:51:50,513 INFO L134 CoverageAnalysis]: Checked inductivity of 8802 backedges. 5673 proven. 3129 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:50,513 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:51:50,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [720543922] [2022-12-14 08:51:50,513 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [720543922] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:51:50,513 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [16422847] [2022-12-14 08:51:50,513 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:51:50,513 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:51:50,513 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:51:50,514 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:51:50,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2022-12-14 08:51:50,840 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 55 check-sat command(s) [2022-12-14 08:51:50,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:51:50,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 1235 conjuncts, 112 conjunts are in the unsatisfiable core [2022-12-14 08:51:50,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:51:54,275 INFO L134 CoverageAnalysis]: Checked inductivity of 8802 backedges. 5832 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:54,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:51:57,021 INFO L134 CoverageAnalysis]: Checked inductivity of 8802 backedges. 5832 proven. 2970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:51:57,021 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [16422847] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:51:57,021 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [324388117] [2022-12-14 08:51:57,022 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:51:57,022 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:51:57,022 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:51:57,022 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:51:57,022 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:51:57,100 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:51:57,891 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '152678#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:51:57,891 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:51:57,891 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:51:57,891 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [112, 112, 112] total 169 [2022-12-14 08:51:57,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128708758] [2022-12-14 08:51:57,892 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:51:57,892 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 169 states [2022-12-14 08:51:57,892 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:51:57,893 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 169 interpolants. [2022-12-14 08:51:57,894 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6525, Invalid=24981, Unknown=0, NotChecked=0, Total=31506 [2022-12-14 08:51:57,895 INFO L87 Difference]: Start difference. First operand 335 states and 337 transitions. Second operand has 169 states, 169 states have (on average 3.301775147928994) internal successors, (558), 169 states have internal predecessors, (558), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:52:00,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:52:00,674 INFO L93 Difference]: Finished difference Result 725 states and 783 transitions. [2022-12-14 08:52:00,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2022-12-14 08:52:00,674 INFO L78 Accepts]: Start accepts. Automaton has has 169 states, 169 states have (on average 3.301775147928994) internal successors, (558), 169 states have internal predecessors, (558), 0 states have call successors, (0), 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 334 [2022-12-14 08:52:00,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:52:00,677 INFO L225 Difference]: With dead ends: 725 [2022-12-14 08:52:00,677 INFO L226 Difference]: Without dead ends: 502 [2022-12-14 08:52:00,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1167 GetRequests, 828 SyntacticMatches, 108 SemanticMatches, 231 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20620 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=12687, Invalid=41369, Unknown=0, NotChecked=0, Total=54056 [2022-12-14 08:52:00,680 INFO L413 NwaCegarLoop]: 112 mSDtfsCounter, 521 mSDsluCounter, 1195 mSDsCounter, 0 mSdLazyCounter, 1371 mSolverCounterSat, 234 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 521 SdHoareTripleChecker+Valid, 1307 SdHoareTripleChecker+Invalid, 1605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 234 IncrementalHoareTripleChecker+Valid, 1371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 08:52:00,680 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [521 Valid, 1307 Invalid, 1605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [234 Valid, 1371 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 08:52:00,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 502 states. [2022-12-14 08:52:00,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 502 to 337. [2022-12-14 08:52:00,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 337 states, 336 states have (on average 1.0089285714285714) internal successors, (339), 336 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:52:00,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 337 states to 337 states and 339 transitions. [2022-12-14 08:52:00,731 INFO L78 Accepts]: Start accepts. Automaton has 337 states and 339 transitions. Word has length 334 [2022-12-14 08:52:00,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:52:00,731 INFO L495 AbstractCegarLoop]: Abstraction has 337 states and 339 transitions. [2022-12-14 08:52:00,731 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 169 states, 169 states have (on average 3.301775147928994) internal successors, (558), 169 states have internal predecessors, (558), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:52:00,732 INFO L276 IsEmpty]: Start isEmpty. Operand 337 states and 339 transitions. [2022-12-14 08:52:00,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 337 [2022-12-14 08:52:00,732 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:52:00,732 INFO L195 NwaCegarLoop]: trace histogram [56, 55, 55, 54, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:52:00,738 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Ended with exit code 0 [2022-12-14 08:52:00,933 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable82 [2022-12-14 08:52:00,934 INFO L420 AbstractCegarLoop]: === Iteration 84 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:52:00,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:52:00,934 INFO L85 PathProgramCache]: Analyzing trace with hash -209691931, now seen corresponding path program 81 times [2022-12-14 08:52:00,935 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:52:00,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [403563414] [2022-12-14 08:52:00,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:52:00,935 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:52:01,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:52:04,073 INFO L134 CoverageAnalysis]: Checked inductivity of 8912 backedges. 2970 proven. 5942 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:52:04,073 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:52:04,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [403563414] [2022-12-14 08:52:04,073 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [403563414] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:52:04,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [443056071] [2022-12-14 08:52:04,073 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:52:04,074 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:52:04,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:52:04,074 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:52:04,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2022-12-14 08:52:04,231 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:52:04,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:52:04,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 1245 conjuncts, 116 conjunts are in the unsatisfiable core [2022-12-14 08:52:04,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:52:04,487 INFO L134 CoverageAnalysis]: Checked inductivity of 8912 backedges. 3080 proven. 5832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:52:04,487 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:52:05,861 INFO L134 CoverageAnalysis]: Checked inductivity of 8912 backedges. 3080 proven. 5832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:52:05,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [443056071] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:52:05,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [795105891] [2022-12-14 08:52:05,861 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:52:05,861 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:52:05,861 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:52:05,862 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:52:05,862 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:52:05,939 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:52:06,289 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '156428#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:52:06,289 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:52:06,289 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:52:06,289 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 58, 58] total 61 [2022-12-14 08:52:06,290 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706778280] [2022-12-14 08:52:06,290 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:52:06,290 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2022-12-14 08:52:06,290 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:52:06,290 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2022-12-14 08:52:06,291 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1763, Invalid=3207, Unknown=0, NotChecked=0, Total=4970 [2022-12-14 08:52:06,291 INFO L87 Difference]: Start difference. First operand 337 states and 339 transitions. Second operand has 62 states, 62 states have (on average 5.758064516129032) internal successors, (357), 61 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:52:07,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:52:07,179 INFO L93 Difference]: Finished difference Result 354 states and 357 transitions. [2022-12-14 08:52:07,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2022-12-14 08:52:07,180 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 5.758064516129032) internal successors, (357), 61 states have internal predecessors, (357), 0 states have call successors, (0), 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 336 [2022-12-14 08:52:07,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:52:07,180 INFO L225 Difference]: With dead ends: 354 [2022-12-14 08:52:07,180 INFO L226 Difference]: Without dead ends: 352 [2022-12-14 08:52:07,181 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1176 GetRequests, 941 SyntacticMatches, 108 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7756 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=5306, Invalid=11206, Unknown=0, NotChecked=0, Total=16512 [2022-12-14 08:52:07,181 INFO L413 NwaCegarLoop]: 64 mSDtfsCounter, 181 mSDsluCounter, 451 mSDsCounter, 0 mSdLazyCounter, 604 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 515 SdHoareTripleChecker+Invalid, 608 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:52:07,181 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [181 Valid, 515 Invalid, 608 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 604 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:52:07,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 352 states. [2022-12-14 08:52:07,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 352 to 345. [2022-12-14 08:52:07,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 345 states, 344 states have (on average 1.0087209302325582) internal successors, (347), 344 states have internal predecessors, (347), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:52:07,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 345 states to 345 states and 347 transitions. [2022-12-14 08:52:07,233 INFO L78 Accepts]: Start accepts. Automaton has 345 states and 347 transitions. Word has length 336 [2022-12-14 08:52:07,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:52:07,233 INFO L495 AbstractCegarLoop]: Abstraction has 345 states and 347 transitions. [2022-12-14 08:52:07,233 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 5.758064516129032) internal successors, (357), 61 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:52:07,233 INFO L276 IsEmpty]: Start isEmpty. Operand 345 states and 347 transitions. [2022-12-14 08:52:07,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2022-12-14 08:52:07,234 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:52:07,234 INFO L195 NwaCegarLoop]: trace histogram [57, 56, 56, 56, 56, 55, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:52:07,240 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Ended with exit code 0 [2022-12-14 08:52:07,435 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:52:07,436 INFO L420 AbstractCegarLoop]: === Iteration 85 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:52:07,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:52:07,436 INFO L85 PathProgramCache]: Analyzing trace with hash -846596149, now seen corresponding path program 82 times [2022-12-14 08:52:07,437 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:52:07,437 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [216365494] [2022-12-14 08:52:07,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:52:07,438 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:52:07,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:52:12,679 INFO L134 CoverageAnalysis]: Checked inductivity of 9352 backedges. 6107 proven. 3245 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:52:12,679 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:52:12,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [216365494] [2022-12-14 08:52:12,679 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [216365494] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:52:12,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2104849090] [2022-12-14 08:52:12,679 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:52:12,679 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:52:12,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:52:12,680 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:52:12,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2022-12-14 08:52:12,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:52:12,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 1269 conjuncts, 114 conjunts are in the unsatisfiable core [2022-12-14 08:52:12,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:52:16,085 INFO L134 CoverageAnalysis]: Checked inductivity of 9352 backedges. 6270 proven. 3080 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:52:16,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:52:18,455 INFO L134 CoverageAnalysis]: Checked inductivity of 9352 backedges. 6270 proven. 3080 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:52:18,455 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2104849090] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:52:18,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1423759483] [2022-12-14 08:52:18,456 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:52:18,456 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:52:18,456 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:52:18,456 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:52:18,456 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:52:18,536 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:52:19,628 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '159826#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:52:19,628 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:52:19,628 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:52:19,628 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [115, 114, 114] total 173 [2022-12-14 08:52:19,628 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076404606] [2022-12-14 08:52:19,628 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:52:19,629 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 173 states [2022-12-14 08:52:19,630 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:52:19,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 173 interpolants. [2022-12-14 08:52:19,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6813, Invalid=26129, Unknown=0, NotChecked=0, Total=32942 [2022-12-14 08:52:19,633 INFO L87 Difference]: Start difference. First operand 345 states and 347 transitions. Second operand has 173 states, 173 states have (on average 3.3294797687861273) internal successors, (576), 173 states have internal predecessors, (576), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:52:23,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:52:23,654 INFO L93 Difference]: Finished difference Result 744 states and 803 transitions. [2022-12-14 08:52:23,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2022-12-14 08:52:23,654 INFO L78 Accepts]: Start accepts. Automaton has has 173 states, 173 states have (on average 3.3294797687861273) internal successors, (576), 173 states have internal predecessors, (576), 0 states have call successors, (0), 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 344 [2022-12-14 08:52:23,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:52:23,656 INFO L225 Difference]: With dead ends: 744 [2022-12-14 08:52:23,657 INFO L226 Difference]: Without dead ends: 515 [2022-12-14 08:52:23,659 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1201 GetRequests, 855 SyntacticMatches, 110 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21563 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=13199, Invalid=43207, Unknown=0, NotChecked=0, Total=56406 [2022-12-14 08:52:23,659 INFO L413 NwaCegarLoop]: 114 mSDtfsCounter, 636 mSDsluCounter, 1247 mSDsCounter, 0 mSdLazyCounter, 1440 mSolverCounterSat, 291 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 636 SdHoareTripleChecker+Valid, 1361 SdHoareTripleChecker+Invalid, 1731 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 291 IncrementalHoareTripleChecker+Valid, 1440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 08:52:23,659 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [636 Valid, 1361 Invalid, 1731 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [291 Valid, 1440 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 08:52:23,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 515 states. [2022-12-14 08:52:23,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 515 to 347. [2022-12-14 08:52:23,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 347 states, 346 states have (on average 1.0086705202312138) internal successors, (349), 346 states have internal predecessors, (349), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:52:23,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 347 states to 347 states and 349 transitions. [2022-12-14 08:52:23,713 INFO L78 Accepts]: Start accepts. Automaton has 347 states and 349 transitions. Word has length 344 [2022-12-14 08:52:23,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:52:23,713 INFO L495 AbstractCegarLoop]: Abstraction has 347 states and 349 transitions. [2022-12-14 08:52:23,713 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 173 states, 173 states have (on average 3.3294797687861273) internal successors, (576), 173 states have internal predecessors, (576), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:52:23,714 INFO L276 IsEmpty]: Start isEmpty. Operand 347 states and 349 transitions. [2022-12-14 08:52:23,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2022-12-14 08:52:23,714 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:52:23,714 INFO L195 NwaCegarLoop]: trace histogram [57, 57, 56, 56, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:52:23,720 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Ended with exit code 0 [2022-12-14 08:52:23,915 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:52:23,916 INFO L420 AbstractCegarLoop]: === Iteration 86 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:52:23,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:52:23,916 INFO L85 PathProgramCache]: Analyzing trace with hash -258734544, now seen corresponding path program 83 times [2022-12-14 08:52:23,917 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:52:23,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1478836219] [2022-12-14 08:52:23,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:52:23,918 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:52:24,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:52:29,071 INFO L134 CoverageAnalysis]: Checked inductivity of 9464 backedges. 6107 proven. 3357 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:52:29,071 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:52:29,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1478836219] [2022-12-14 08:52:29,071 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1478836219] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:52:29,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1726268181] [2022-12-14 08:52:29,071 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:52:29,072 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:52:29,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:52:29,072 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:52:29,073 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2022-12-14 08:52:29,336 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2022-12-14 08:52:29,336 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:52:29,343 INFO L263 TraceCheckSpWp]: Trace formula consists of 1279 conjuncts, 116 conjunts are in the unsatisfiable core [2022-12-14 08:52:29,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:52:32,556 INFO L134 CoverageAnalysis]: Checked inductivity of 9464 backedges. 6272 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:52:32,556 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:52:35,198 INFO L134 CoverageAnalysis]: Checked inductivity of 9464 backedges. 6272 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:52:35,199 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1726268181] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:52:35,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [286044877] [2022-12-14 08:52:35,199 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:52:35,199 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:52:35,199 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:52:35,200 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:52:35,200 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:52:35,275 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:52:35,977 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '163794#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:52:35,977 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:52:35,977 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:52:35,977 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [116, 116, 116] total 175 [2022-12-14 08:52:35,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141029940] [2022-12-14 08:52:35,977 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:52:35,978 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 175 states [2022-12-14 08:52:35,978 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:52:35,979 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 175 interpolants. [2022-12-14 08:52:35,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6989, Invalid=26683, Unknown=0, NotChecked=0, Total=33672 [2022-12-14 08:52:35,980 INFO L87 Difference]: Start difference. First operand 347 states and 349 transitions. Second operand has 175 states, 175 states have (on average 3.302857142857143) internal successors, (578), 175 states have internal predecessors, (578), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:52:39,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:52:39,432 INFO L93 Difference]: Finished difference Result 751 states and 811 transitions. [2022-12-14 08:52:39,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2022-12-14 08:52:39,432 INFO L78 Accepts]: Start accepts. Automaton has has 175 states, 175 states have (on average 3.302857142857143) internal successors, (578), 175 states have internal predecessors, (578), 0 states have call successors, (0), 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 346 [2022-12-14 08:52:39,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:52:39,434 INFO L225 Difference]: With dead ends: 751 [2022-12-14 08:52:39,434 INFO L226 Difference]: Without dead ends: 520 [2022-12-14 08:52:39,436 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1209 GetRequests, 858 SyntacticMatches, 112 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22054 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=13603, Invalid=44237, Unknown=0, NotChecked=0, Total=57840 [2022-12-14 08:52:39,437 INFO L413 NwaCegarLoop]: 116 mSDtfsCounter, 592 mSDsluCounter, 1330 mSDsCounter, 0 mSdLazyCounter, 1508 mSolverCounterSat, 269 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 592 SdHoareTripleChecker+Valid, 1446 SdHoareTripleChecker+Invalid, 1777 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 269 IncrementalHoareTripleChecker+Valid, 1508 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 08:52:39,437 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [592 Valid, 1446 Invalid, 1777 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [269 Valid, 1508 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 08:52:39,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 520 states. [2022-12-14 08:52:39,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 520 to 349. [2022-12-14 08:52:39,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 349 states, 348 states have (on average 1.0086206896551724) internal successors, (351), 348 states have internal predecessors, (351), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:52:39,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 349 states to 349 states and 351 transitions. [2022-12-14 08:52:39,494 INFO L78 Accepts]: Start accepts. Automaton has 349 states and 351 transitions. Word has length 346 [2022-12-14 08:52:39,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:52:39,494 INFO L495 AbstractCegarLoop]: Abstraction has 349 states and 351 transitions. [2022-12-14 08:52:39,494 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 175 states, 175 states have (on average 3.302857142857143) internal successors, (578), 175 states have internal predecessors, (578), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:52:39,494 INFO L276 IsEmpty]: Start isEmpty. Operand 349 states and 351 transitions. [2022-12-14 08:52:39,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 349 [2022-12-14 08:52:39,495 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:52:39,495 INFO L195 NwaCegarLoop]: trace histogram [58, 57, 57, 56, 56, 56, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:52:39,501 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Ended with exit code 0 [2022-12-14 08:52:39,696 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable85,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:52:39,697 INFO L420 AbstractCegarLoop]: === Iteration 87 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:52:39,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:52:39,697 INFO L85 PathProgramCache]: Analyzing trace with hash 2035552085, now seen corresponding path program 84 times [2022-12-14 08:52:39,698 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:52:39,698 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1857493409] [2022-12-14 08:52:39,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:52:39,698 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:52:39,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:52:43,039 INFO L134 CoverageAnalysis]: Checked inductivity of 9578 backedges. 3192 proven. 6386 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:52:43,039 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:52:43,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1857493409] [2022-12-14 08:52:43,040 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1857493409] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:52:43,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1475852272] [2022-12-14 08:52:43,040 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:52:43,040 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:52:43,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:52:43,041 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:52:43,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2022-12-14 08:52:43,200 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:52:43,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:52:43,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 1289 conjuncts, 120 conjunts are in the unsatisfiable core [2022-12-14 08:52:43,210 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:52:43,462 INFO L134 CoverageAnalysis]: Checked inductivity of 9578 backedges. 3306 proven. 6272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:52:43,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:52:45,336 INFO L134 CoverageAnalysis]: Checked inductivity of 9578 backedges. 3306 proven. 6272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:52:45,336 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1475852272] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:52:45,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [519986239] [2022-12-14 08:52:45,336 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:52:45,337 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:52:45,337 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:52:45,337 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:52:45,337 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:52:45,404 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:52:45,816 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '167678#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:52:45,816 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:52:45,817 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:52:45,817 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 63 [2022-12-14 08:52:45,817 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392280145] [2022-12-14 08:52:45,817 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:52:45,817 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-12-14 08:52:45,817 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:52:45,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-12-14 08:52:45,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1882, Invalid=3374, Unknown=0, NotChecked=0, Total=5256 [2022-12-14 08:52:45,818 INFO L87 Difference]: Start difference. First operand 349 states and 351 transitions. Second operand has 64 states, 64 states have (on average 5.765625) internal successors, (369), 63 states have internal predecessors, (369), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:52:46,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:52:46,971 INFO L93 Difference]: Finished difference Result 366 states and 369 transitions. [2022-12-14 08:52:46,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2022-12-14 08:52:46,971 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 5.765625) internal successors, (369), 63 states have internal predecessors, (369), 0 states have call successors, (0), 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 348 [2022-12-14 08:52:46,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:52:46,972 INFO L225 Difference]: With dead ends: 366 [2022-12-14 08:52:46,972 INFO L226 Difference]: Without dead ends: 364 [2022-12-14 08:52:46,972 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1218 GetRequests, 975 SyntacticMatches, 112 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8264 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=5667, Invalid=11889, Unknown=0, NotChecked=0, Total=17556 [2022-12-14 08:52:46,973 INFO L413 NwaCegarLoop]: 66 mSDtfsCounter, 186 mSDsluCounter, 522 mSDsCounter, 0 mSdLazyCounter, 685 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 588 SdHoareTripleChecker+Invalid, 689 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 685 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:52:46,973 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [186 Valid, 588 Invalid, 689 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 685 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:52:46,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 364 states. [2022-12-14 08:52:47,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 364 to 357. [2022-12-14 08:52:47,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 357 states, 356 states have (on average 1.0084269662921348) internal successors, (359), 356 states have internal predecessors, (359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:52:47,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 357 states to 357 states and 359 transitions. [2022-12-14 08:52:47,029 INFO L78 Accepts]: Start accepts. Automaton has 357 states and 359 transitions. Word has length 348 [2022-12-14 08:52:47,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:52:47,029 INFO L495 AbstractCegarLoop]: Abstraction has 357 states and 359 transitions. [2022-12-14 08:52:47,030 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 5.765625) internal successors, (369), 63 states have internal predecessors, (369), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:52:47,030 INFO L276 IsEmpty]: Start isEmpty. Operand 357 states and 359 transitions. [2022-12-14 08:52:47,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 357 [2022-12-14 08:52:47,030 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:52:47,031 INFO L195 NwaCegarLoop]: trace histogram [59, 58, 58, 58, 58, 57, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:52:47,036 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Forceful destruction successful, exit code 0 [2022-12-14 08:52:47,231 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:52:47,232 INFO L420 AbstractCegarLoop]: === Iteration 88 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:52:47,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:52:47,233 INFO L85 PathProgramCache]: Analyzing trace with hash -866501573, now seen corresponding path program 85 times [2022-12-14 08:52:47,233 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:52:47,233 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82432067] [2022-12-14 08:52:47,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:52:47,234 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:52:47,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:52:52,610 INFO L134 CoverageAnalysis]: Checked inductivity of 10034 backedges. 6557 proven. 3477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:52:52,610 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:52:52,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82432067] [2022-12-14 08:52:52,610 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [82432067] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:52:52,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1907447493] [2022-12-14 08:52:52,610 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:52:52,610 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:52:52,610 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:52:52,611 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:52:52,612 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2022-12-14 08:52:52,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:52:52,755 INFO L263 TraceCheckSpWp]: Trace formula consists of 1313 conjuncts, 118 conjunts are in the unsatisfiable core [2022-12-14 08:52:52,758 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:52:56,620 INFO L134 CoverageAnalysis]: Checked inductivity of 10034 backedges. 6726 proven. 3306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:52:56,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:52:59,450 INFO L134 CoverageAnalysis]: Checked inductivity of 10034 backedges. 6726 proven. 3306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:52:59,451 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1907447493] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:52:59,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [910329979] [2022-12-14 08:52:59,452 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:52:59,452 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:52:59,452 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:52:59,452 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:52:59,452 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:52:59,522 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:53:00,271 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '171194#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:53:00,271 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:53:00,272 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:53:00,272 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [119, 118, 118] total 179 [2022-12-14 08:53:00,272 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [479532796] [2022-12-14 08:53:00,272 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:53:00,273 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 179 states [2022-12-14 08:53:00,273 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:53:00,275 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 179 interpolants. [2022-12-14 08:53:00,277 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7287, Invalid=27869, Unknown=0, NotChecked=0, Total=35156 [2022-12-14 08:53:00,277 INFO L87 Difference]: Start difference. First operand 357 states and 359 transitions. Second operand has 179 states, 179 states have (on average 3.329608938547486) internal successors, (596), 179 states have internal predecessors, (596), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:04,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:53:04,232 INFO L93 Difference]: Finished difference Result 770 states and 831 transitions. [2022-12-14 08:53:04,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2022-12-14 08:53:04,232 INFO L78 Accepts]: Start accepts. Automaton has has 179 states, 179 states have (on average 3.329608938547486) internal successors, (596), 179 states have internal predecessors, (596), 0 states have call successors, (0), 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 356 [2022-12-14 08:53:04,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:53:04,233 INFO L225 Difference]: With dead ends: 770 [2022-12-14 08:53:04,233 INFO L226 Difference]: Without dead ends: 533 [2022-12-14 08:53:04,235 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1243 GetRequests, 885 SyntacticMatches, 114 SemanticMatches, 244 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23029 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=14133, Invalid=46137, Unknown=0, NotChecked=0, Total=60270 [2022-12-14 08:53:04,235 INFO L413 NwaCegarLoop]: 118 mSDtfsCounter, 564 mSDsluCounter, 1489 mSDsCounter, 0 mSdLazyCounter, 1656 mSolverCounterSat, 255 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 564 SdHoareTripleChecker+Valid, 1607 SdHoareTripleChecker+Invalid, 1911 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 255 IncrementalHoareTripleChecker+Valid, 1656 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 08:53:04,236 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [564 Valid, 1607 Invalid, 1911 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [255 Valid, 1656 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 08:53:04,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 533 states. [2022-12-14 08:53:04,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 533 to 359. [2022-12-14 08:53:04,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 359 states, 358 states have (on average 1.0083798882681565) internal successors, (361), 358 states have internal predecessors, (361), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:04,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 361 transitions. [2022-12-14 08:53:04,293 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 361 transitions. Word has length 356 [2022-12-14 08:53:04,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:53:04,294 INFO L495 AbstractCegarLoop]: Abstraction has 359 states and 361 transitions. [2022-12-14 08:53:04,294 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 179 states, 179 states have (on average 3.329608938547486) internal successors, (596), 179 states have internal predecessors, (596), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:04,294 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 361 transitions. [2022-12-14 08:53:04,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 359 [2022-12-14 08:53:04,295 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:53:04,295 INFO L195 NwaCegarLoop]: trace histogram [59, 59, 58, 58, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:53:04,300 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Ended with exit code 0 [2022-12-14 08:53:04,495 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable87 [2022-12-14 08:53:04,496 INFO L420 AbstractCegarLoop]: === Iteration 89 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:53:04,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:53:04,497 INFO L85 PathProgramCache]: Analyzing trace with hash -193930464, now seen corresponding path program 86 times [2022-12-14 08:53:04,497 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:53:04,497 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9068106] [2022-12-14 08:53:04,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:53:04,497 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:53:04,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:53:09,607 INFO L134 CoverageAnalysis]: Checked inductivity of 10150 backedges. 6557 proven. 3593 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:53:09,607 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:53:09,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9068106] [2022-12-14 08:53:09,608 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [9068106] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:53:09,608 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2108048022] [2022-12-14 08:53:09,608 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:53:09,608 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:53:09,608 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:53:09,609 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:53:09,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2022-12-14 08:53:09,894 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 59 check-sat command(s) [2022-12-14 08:53:09,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:53:09,901 INFO L263 TraceCheckSpWp]: Trace formula consists of 1323 conjuncts, 120 conjunts are in the unsatisfiable core [2022-12-14 08:53:09,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:53:13,960 INFO L134 CoverageAnalysis]: Checked inductivity of 10150 backedges. 6728 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:53:13,960 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:53:17,374 INFO L134 CoverageAnalysis]: Checked inductivity of 10150 backedges. 6728 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:53:17,374 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2108048022] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:53:17,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [997396813] [2022-12-14 08:53:17,375 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:53:17,375 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:53:17,375 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:53:17,375 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:53:17,375 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:53:17,462 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:53:18,416 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '175300#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:53:18,416 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:53:18,416 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:53:18,416 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [120, 120, 120] total 181 [2022-12-14 08:53:18,416 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1556094900] [2022-12-14 08:53:18,416 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:53:18,417 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 181 states [2022-12-14 08:53:18,417 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:53:18,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 181 interpolants. [2022-12-14 08:53:18,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7469, Invalid=28441, Unknown=0, NotChecked=0, Total=35910 [2022-12-14 08:53:18,419 INFO L87 Difference]: Start difference. First operand 359 states and 361 transitions. Second operand has 181 states, 181 states have (on average 3.303867403314917) internal successors, (598), 181 states have internal predecessors, (598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:22,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:53:22,033 INFO L93 Difference]: Finished difference Result 777 states and 839 transitions. [2022-12-14 08:53:22,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2022-12-14 08:53:22,033 INFO L78 Accepts]: Start accepts. Automaton has has 181 states, 181 states have (on average 3.303867403314917) internal successors, (598), 181 states have internal predecessors, (598), 0 states have call successors, (0), 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 358 [2022-12-14 08:53:22,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:53:22,034 INFO L225 Difference]: With dead ends: 777 [2022-12-14 08:53:22,034 INFO L226 Difference]: Without dead ends: 538 [2022-12-14 08:53:22,037 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1251 GetRequests, 888 SyntacticMatches, 116 SemanticMatches, 247 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23536 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=14551, Invalid=47201, Unknown=0, NotChecked=0, Total=61752 [2022-12-14 08:53:22,037 INFO L413 NwaCegarLoop]: 120 mSDtfsCounter, 722 mSDsluCounter, 1318 mSDsCounter, 0 mSdLazyCounter, 1502 mSolverCounterSat, 332 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 722 SdHoareTripleChecker+Valid, 1438 SdHoareTripleChecker+Invalid, 1834 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 332 IncrementalHoareTripleChecker+Valid, 1502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 08:53:22,037 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [722 Valid, 1438 Invalid, 1834 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [332 Valid, 1502 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 08:53:22,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 538 states. [2022-12-14 08:53:22,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 538 to 361. [2022-12-14 08:53:22,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 361 states, 360 states have (on average 1.0083333333333333) internal successors, (363), 360 states have internal predecessors, (363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:22,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 361 states to 361 states and 363 transitions. [2022-12-14 08:53:22,103 INFO L78 Accepts]: Start accepts. Automaton has 361 states and 363 transitions. Word has length 358 [2022-12-14 08:53:22,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:53:22,104 INFO L495 AbstractCegarLoop]: Abstraction has 361 states and 363 transitions. [2022-12-14 08:53:22,104 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 181 states, 181 states have (on average 3.303867403314917) internal successors, (598), 181 states have internal predecessors, (598), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:22,104 INFO L276 IsEmpty]: Start isEmpty. Operand 361 states and 363 transitions. [2022-12-14 08:53:22,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 361 [2022-12-14 08:53:22,105 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:53:22,105 INFO L195 NwaCegarLoop]: trace histogram [60, 59, 59, 58, 58, 58, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:53:22,111 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Ended with exit code 0 [2022-12-14 08:53:22,306 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable88 [2022-12-14 08:53:22,306 INFO L420 AbstractCegarLoop]: === Iteration 90 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:53:22,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:53:22,307 INFO L85 PathProgramCache]: Analyzing trace with hash 1901810885, now seen corresponding path program 87 times [2022-12-14 08:53:22,307 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:53:22,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337370978] [2022-12-14 08:53:22,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:53:22,308 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:53:22,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:53:25,907 INFO L134 CoverageAnalysis]: Checked inductivity of 10268 backedges. 3422 proven. 6846 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:53:25,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:53:25,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [337370978] [2022-12-14 08:53:25,908 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [337370978] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:53:25,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2067046267] [2022-12-14 08:53:25,908 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:53:25,908 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:53:25,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:53:25,909 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:53:25,909 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2022-12-14 08:53:26,046 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:53:26,046 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:53:26,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 1333 conjuncts, 124 conjunts are in the unsatisfiable core [2022-12-14 08:53:26,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:53:26,342 INFO L134 CoverageAnalysis]: Checked inductivity of 10268 backedges. 3540 proven. 6728 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:53:26,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:53:28,314 INFO L134 CoverageAnalysis]: Checked inductivity of 10268 backedges. 3540 proven. 6728 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:53:28,314 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2067046267] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:53:28,314 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1975960783] [2022-12-14 08:53:28,315 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:53:28,315 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:53:28,316 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:53:28,316 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:53:28,316 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:53:28,407 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:53:28,909 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '179318#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:53:28,909 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:53:28,909 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:53:28,910 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 65 [2022-12-14 08:53:28,910 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631783263] [2022-12-14 08:53:28,910 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:53:28,910 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2022-12-14 08:53:28,910 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:53:28,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2022-12-14 08:53:28,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2005, Invalid=3545, Unknown=0, NotChecked=0, Total=5550 [2022-12-14 08:53:28,912 INFO L87 Difference]: Start difference. First operand 361 states and 363 transitions. Second operand has 66 states, 66 states have (on average 5.7727272727272725) internal successors, (381), 65 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:30,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:53:30,062 INFO L93 Difference]: Finished difference Result 378 states and 381 transitions. [2022-12-14 08:53:30,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2022-12-14 08:53:30,062 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 5.7727272727272725) internal successors, (381), 65 states have internal predecessors, (381), 0 states have call successors, (0), 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 360 [2022-12-14 08:53:30,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:53:30,063 INFO L225 Difference]: With dead ends: 378 [2022-12-14 08:53:30,063 INFO L226 Difference]: Without dead ends: 376 [2022-12-14 08:53:30,064 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1260 GetRequests, 1009 SyntacticMatches, 116 SemanticMatches, 135 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8788 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=6040, Invalid=12592, Unknown=0, NotChecked=0, Total=18632 [2022-12-14 08:53:30,065 INFO L413 NwaCegarLoop]: 68 mSDtfsCounter, 371 mSDsluCounter, 427 mSDsCounter, 0 mSdLazyCounter, 586 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 371 SdHoareTripleChecker+Valid, 495 SdHoareTripleChecker+Invalid, 590 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 586 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:53:30,065 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [371 Valid, 495 Invalid, 590 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 586 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:53:30,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2022-12-14 08:53:30,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 369. [2022-12-14 08:53:30,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 369 states, 368 states have (on average 1.0081521739130435) internal successors, (371), 368 states have internal predecessors, (371), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:30,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 369 states to 369 states and 371 transitions. [2022-12-14 08:53:30,131 INFO L78 Accepts]: Start accepts. Automaton has 369 states and 371 transitions. Word has length 360 [2022-12-14 08:53:30,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:53:30,131 INFO L495 AbstractCegarLoop]: Abstraction has 369 states and 371 transitions. [2022-12-14 08:53:30,131 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 5.7727272727272725) internal successors, (381), 65 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:30,131 INFO L276 IsEmpty]: Start isEmpty. Operand 369 states and 371 transitions. [2022-12-14 08:53:30,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 369 [2022-12-14 08:53:30,132 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:53:30,132 INFO L195 NwaCegarLoop]: trace histogram [61, 60, 60, 60, 60, 59, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:53:30,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Forceful destruction successful, exit code 0 [2022-12-14 08:53:30,333 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable89,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:53:30,334 INFO L420 AbstractCegarLoop]: === Iteration 91 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:53:30,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:53:30,334 INFO L85 PathProgramCache]: Analyzing trace with hash 490541483, now seen corresponding path program 88 times [2022-12-14 08:53:30,335 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:53:30,335 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [189639877] [2022-12-14 08:53:30,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:53:30,335 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:53:30,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:53:35,820 INFO L134 CoverageAnalysis]: Checked inductivity of 10740 backedges. 7023 proven. 3717 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:53:35,820 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:53:35,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [189639877] [2022-12-14 08:53:35,820 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [189639877] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:53:35,820 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [314541937] [2022-12-14 08:53:35,820 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:53:35,820 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:53:35,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:53:35,821 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:53:35,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2022-12-14 08:53:35,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:53:35,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 1357 conjuncts, 122 conjunts are in the unsatisfiable core [2022-12-14 08:53:35,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:53:39,332 INFO L134 CoverageAnalysis]: Checked inductivity of 10740 backedges. 7198 proven. 3540 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:53:39,332 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:53:42,213 INFO L134 CoverageAnalysis]: Checked inductivity of 10740 backedges. 7198 proven. 3540 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:53:42,213 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [314541937] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:53:42,213 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2071343212] [2022-12-14 08:53:42,214 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:53:42,214 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:53:42,214 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:53:42,215 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:53:42,215 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:53:42,285 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:53:43,322 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '182952#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:53:43,322 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:53:43,322 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:53:43,322 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [123, 122, 122] total 185 [2022-12-14 08:53:43,322 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48022838] [2022-12-14 08:53:43,323 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:53:43,323 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 185 states [2022-12-14 08:53:43,323 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:53:43,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 185 interpolants. [2022-12-14 08:53:43,326 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7777, Invalid=29665, Unknown=0, NotChecked=0, Total=37442 [2022-12-14 08:53:43,326 INFO L87 Difference]: Start difference. First operand 369 states and 371 transitions. Second operand has 185 states, 185 states have (on average 3.32972972972973) internal successors, (616), 185 states have internal predecessors, (616), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:47,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:53:47,553 INFO L93 Difference]: Finished difference Result 796 states and 859 transitions. [2022-12-14 08:53:47,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2022-12-14 08:53:47,553 INFO L78 Accepts]: Start accepts. Automaton has has 185 states, 185 states have (on average 3.32972972972973) internal successors, (616), 185 states have internal predecessors, (616), 0 states have call successors, (0), 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 368 [2022-12-14 08:53:47,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:53:47,554 INFO L225 Difference]: With dead ends: 796 [2022-12-14 08:53:47,554 INFO L226 Difference]: Without dead ends: 551 [2022-12-14 08:53:47,557 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1285 GetRequests, 915 SyntacticMatches, 118 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24543 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=15099, Invalid=49163, Unknown=0, NotChecked=0, Total=64262 [2022-12-14 08:53:47,557 INFO L413 NwaCegarLoop]: 122 mSDtfsCounter, 605 mSDsluCounter, 1516 mSDsCounter, 0 mSdLazyCounter, 1705 mSolverCounterSat, 273 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 605 SdHoareTripleChecker+Valid, 1638 SdHoareTripleChecker+Invalid, 1978 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 273 IncrementalHoareTripleChecker+Valid, 1705 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 08:53:47,557 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [605 Valid, 1638 Invalid, 1978 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [273 Valid, 1705 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 08:53:47,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 551 states. [2022-12-14 08:53:47,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 551 to 371. [2022-12-14 08:53:47,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 371 states, 370 states have (on average 1.008108108108108) internal successors, (373), 370 states have internal predecessors, (373), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:47,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 371 states to 371 states and 373 transitions. [2022-12-14 08:53:47,620 INFO L78 Accepts]: Start accepts. Automaton has 371 states and 373 transitions. Word has length 368 [2022-12-14 08:53:47,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:53:47,620 INFO L495 AbstractCegarLoop]: Abstraction has 371 states and 373 transitions. [2022-12-14 08:53:47,621 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 185 states, 185 states have (on average 3.32972972972973) internal successors, (616), 185 states have internal predecessors, (616), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:53:47,621 INFO L276 IsEmpty]: Start isEmpty. Operand 371 states and 373 transitions. [2022-12-14 08:53:47,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 371 [2022-12-14 08:53:47,622 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:53:47,622 INFO L195 NwaCegarLoop]: trace histogram [61, 61, 60, 60, 60, 60, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:53:47,627 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Ended with exit code 0 [2022-12-14 08:53:47,822 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:53:47,822 INFO L420 AbstractCegarLoop]: === Iteration 92 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:53:47,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:53:47,822 INFO L85 PathProgramCache]: Analyzing trace with hash 227246352, now seen corresponding path program 89 times [2022-12-14 08:53:47,822 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:53:47,823 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1580712463] [2022-12-14 08:53:47,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:53:47,823 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:53:47,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:53:53,302 INFO L134 CoverageAnalysis]: Checked inductivity of 10860 backedges. 7023 proven. 3837 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:53:53,302 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:53:53,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1580712463] [2022-12-14 08:53:53,302 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1580712463] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:53:53,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1936127651] [2022-12-14 08:53:53,302 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:53:53,302 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:53:53,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:53:53,303 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:53:53,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2022-12-14 08:53:53,628 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 61 check-sat command(s) [2022-12-14 08:53:53,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:53:53,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 1367 conjuncts, 124 conjunts are in the unsatisfiable core [2022-12-14 08:53:53,638 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:53:58,084 INFO L134 CoverageAnalysis]: Checked inductivity of 10860 backedges. 7200 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:53:58,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:01,079 INFO L134 CoverageAnalysis]: Checked inductivity of 10860 backedges. 7200 proven. 3660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:01,080 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1936127651] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:01,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [70830201] [2022-12-14 08:54:01,080 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:54:01,080 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:01,080 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:01,080 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:01,080 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:01,147 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:02,110 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '187196#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:02,110 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:02,110 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:02,111 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [124, 124, 124] total 187 [2022-12-14 08:54:02,111 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242221000] [2022-12-14 08:54:02,111 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:02,111 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 187 states [2022-12-14 08:54:02,111 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:02,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 187 interpolants. [2022-12-14 08:54:02,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7965, Invalid=30255, Unknown=0, NotChecked=0, Total=38220 [2022-12-14 08:54:02,114 INFO L87 Difference]: Start difference. First operand 371 states and 373 transitions. Second operand has 187 states, 187 states have (on average 3.304812834224599) internal successors, (618), 187 states have internal predecessors, (618), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:05,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:05,864 INFO L93 Difference]: Finished difference Result 803 states and 867 transitions. [2022-12-14 08:54:05,864 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2022-12-14 08:54:05,864 INFO L78 Accepts]: Start accepts. Automaton has has 187 states, 187 states have (on average 3.304812834224599) internal successors, (618), 187 states have internal predecessors, (618), 0 states have call successors, (0), 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 370 [2022-12-14 08:54:05,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:05,865 INFO L225 Difference]: With dead ends: 803 [2022-12-14 08:54:05,865 INFO L226 Difference]: Without dead ends: 556 [2022-12-14 08:54:05,868 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1293 GetRequests, 918 SyntacticMatches, 120 SemanticMatches, 255 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25066 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=15531, Invalid=50261, Unknown=0, NotChecked=0, Total=65792 [2022-12-14 08:54:05,868 INFO L413 NwaCegarLoop]: 124 mSDtfsCounter, 606 mSDsluCounter, 1492 mSDsCounter, 0 mSdLazyCounter, 1667 mSolverCounterSat, 273 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 606 SdHoareTripleChecker+Valid, 1616 SdHoareTripleChecker+Invalid, 1940 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 273 IncrementalHoareTripleChecker+Valid, 1667 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:05,869 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [606 Valid, 1616 Invalid, 1940 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [273 Valid, 1667 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 08:54:05,869 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 556 states. [2022-12-14 08:54:05,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 556 to 373. [2022-12-14 08:54:05,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 373 states, 372 states have (on average 1.0080645161290323) internal successors, (375), 372 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:05,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 373 states to 373 states and 375 transitions. [2022-12-14 08:54:05,931 INFO L78 Accepts]: Start accepts. Automaton has 373 states and 375 transitions. Word has length 370 [2022-12-14 08:54:05,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:05,931 INFO L495 AbstractCegarLoop]: Abstraction has 373 states and 375 transitions. [2022-12-14 08:54:05,932 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 187 states, 187 states have (on average 3.304812834224599) internal successors, (618), 187 states have internal predecessors, (618), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:05,932 INFO L276 IsEmpty]: Start isEmpty. Operand 373 states and 375 transitions. [2022-12-14 08:54:05,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 373 [2022-12-14 08:54:05,933 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:05,933 INFO L195 NwaCegarLoop]: trace histogram [62, 61, 61, 60, 60, 60, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:54:05,938 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Ended with exit code 0 [2022-12-14 08:54:06,133 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:06,134 INFO L420 AbstractCegarLoop]: === Iteration 93 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:06,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:06,135 INFO L85 PathProgramCache]: Analyzing trace with hash 603695925, now seen corresponding path program 90 times [2022-12-14 08:54:06,135 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:06,135 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [758107616] [2022-12-14 08:54:06,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:06,135 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:06,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:10,128 INFO L134 CoverageAnalysis]: Checked inductivity of 10982 backedges. 3660 proven. 7322 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:10,128 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:10,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [758107616] [2022-12-14 08:54:10,128 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [758107616] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:10,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1713872863] [2022-12-14 08:54:10,128 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:54:10,128 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:10,128 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:10,129 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:10,129 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2022-12-14 08:54:10,293 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:54:10,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:10,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 1377 conjuncts, 128 conjunts are in the unsatisfiable core [2022-12-14 08:54:10,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:10,554 INFO L134 CoverageAnalysis]: Checked inductivity of 10982 backedges. 3782 proven. 7200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:10,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:12,605 INFO L134 CoverageAnalysis]: Checked inductivity of 10982 backedges. 3782 proven. 7200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:12,606 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1713872863] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:12,606 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1444009524] [2022-12-14 08:54:12,606 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:54:12,606 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:12,606 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:12,606 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:12,606 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:12,683 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:13,168 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '191348#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:13,168 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:13,168 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:13,169 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [64, 64, 64] total 67 [2022-12-14 08:54:13,169 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1077884687] [2022-12-14 08:54:13,169 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:13,169 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 68 states [2022-12-14 08:54:13,169 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:13,170 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2022-12-14 08:54:13,170 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2132, Invalid=3720, Unknown=0, NotChecked=0, Total=5852 [2022-12-14 08:54:13,170 INFO L87 Difference]: Start difference. First operand 373 states and 375 transitions. Second operand has 68 states, 68 states have (on average 5.779411764705882) internal successors, (393), 67 states have internal predecessors, (393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:14,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:14,356 INFO L93 Difference]: Finished difference Result 390 states and 393 transitions. [2022-12-14 08:54:14,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2022-12-14 08:54:14,356 INFO L78 Accepts]: Start accepts. Automaton has has 68 states, 68 states have (on average 5.779411764705882) internal successors, (393), 67 states have internal predecessors, (393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 372 [2022-12-14 08:54:14,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:14,357 INFO L225 Difference]: With dead ends: 390 [2022-12-14 08:54:14,357 INFO L226 Difference]: Without dead ends: 388 [2022-12-14 08:54:14,359 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1302 GetRequests, 1043 SyntacticMatches, 120 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9328 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=6425, Invalid=13315, Unknown=0, NotChecked=0, Total=19740 [2022-12-14 08:54:14,359 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 383 mSDsluCounter, 482 mSDsCounter, 0 mSdLazyCounter, 647 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 383 SdHoareTripleChecker+Valid, 552 SdHoareTripleChecker+Invalid, 651 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 647 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:14,359 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [383 Valid, 552 Invalid, 651 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 647 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 08:54:14,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 388 states. [2022-12-14 08:54:14,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 388 to 381. [2022-12-14 08:54:14,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 381 states, 380 states have (on average 1.0078947368421052) internal successors, (383), 380 states have internal predecessors, (383), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:14,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 381 states to 381 states and 383 transitions. [2022-12-14 08:54:14,424 INFO L78 Accepts]: Start accepts. Automaton has 381 states and 383 transitions. Word has length 372 [2022-12-14 08:54:14,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:14,424 INFO L495 AbstractCegarLoop]: Abstraction has 381 states and 383 transitions. [2022-12-14 08:54:14,424 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 68 states, 68 states have (on average 5.779411764705882) internal successors, (393), 67 states have internal predecessors, (393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:14,424 INFO L276 IsEmpty]: Start isEmpty. Operand 381 states and 383 transitions. [2022-12-14 08:54:14,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 381 [2022-12-14 08:54:14,425 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:14,425 INFO L195 NwaCegarLoop]: trace histogram [63, 62, 62, 62, 62, 61, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:54:14,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Forceful destruction successful, exit code 0 [2022-12-14 08:54:14,626 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:14,626 INFO L420 AbstractCegarLoop]: === Iteration 94 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:14,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:14,627 INFO L85 PathProgramCache]: Analyzing trace with hash 186120219, now seen corresponding path program 91 times [2022-12-14 08:54:14,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:14,628 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577233554] [2022-12-14 08:54:14,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:14,628 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:14,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:20,163 INFO L134 CoverageAnalysis]: Checked inductivity of 11470 backedges. 7505 proven. 3965 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:20,163 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:20,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577233554] [2022-12-14 08:54:20,164 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1577233554] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:20,164 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [94086208] [2022-12-14 08:54:20,164 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:54:20,164 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:20,164 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:20,164 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:20,165 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Waiting until timeout for monitored process [2022-12-14 08:54:20,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:20,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 1401 conjuncts, 126 conjunts are in the unsatisfiable core [2022-12-14 08:54:20,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:24,031 INFO L134 CoverageAnalysis]: Checked inductivity of 11470 backedges. 7686 proven. 3782 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:54:24,031 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:26,748 INFO L134 CoverageAnalysis]: Checked inductivity of 11470 backedges. 7686 proven. 3782 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:54:26,749 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [94086208] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:26,749 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1676944389] [2022-12-14 08:54:26,749 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:54:26,749 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:26,749 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:26,750 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:26,750 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:26,820 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:27,605 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '195100#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:27,605 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:27,605 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:27,605 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [127, 126, 126] total 191 [2022-12-14 08:54:27,605 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976740890] [2022-12-14 08:54:27,606 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:27,606 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 191 states [2022-12-14 08:54:27,606 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:27,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 191 interpolants. [2022-12-14 08:54:27,609 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8283, Invalid=31517, Unknown=0, NotChecked=0, Total=39800 [2022-12-14 08:54:27,609 INFO L87 Difference]: Start difference. First operand 381 states and 383 transitions. Second operand has 191 states, 191 states have (on average 3.329842931937173) internal successors, (636), 191 states have internal predecessors, (636), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:32,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:32,098 INFO L93 Difference]: Finished difference Result 822 states and 887 transitions. [2022-12-14 08:54:32,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2022-12-14 08:54:32,098 INFO L78 Accepts]: Start accepts. Automaton has has 191 states, 191 states have (on average 3.329842931937173) internal successors, (636), 191 states have internal predecessors, (636), 0 states have call successors, (0), 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 380 [2022-12-14 08:54:32,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:32,099 INFO L225 Difference]: With dead ends: 822 [2022-12-14 08:54:32,099 INFO L226 Difference]: Without dead ends: 569 [2022-12-14 08:54:32,101 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1327 GetRequests, 945 SyntacticMatches, 122 SemanticMatches, 260 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26105 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=16097, Invalid=52285, Unknown=0, NotChecked=0, Total=68382 [2022-12-14 08:54:32,102 INFO L413 NwaCegarLoop]: 126 mSDtfsCounter, 579 mSDsluCounter, 1374 mSDsCounter, 0 mSdLazyCounter, 1570 mSolverCounterSat, 260 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 579 SdHoareTripleChecker+Valid, 1500 SdHoareTripleChecker+Invalid, 1830 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 260 IncrementalHoareTripleChecker+Valid, 1570 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:32,102 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [579 Valid, 1500 Invalid, 1830 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [260 Valid, 1570 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 08:54:32,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 569 states. [2022-12-14 08:54:32,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 569 to 383. [2022-12-14 08:54:32,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 383 states, 382 states have (on average 1.0078534031413613) internal successors, (385), 382 states have internal predecessors, (385), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:32,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 383 states to 383 states and 385 transitions. [2022-12-14 08:54:32,167 INFO L78 Accepts]: Start accepts. Automaton has 383 states and 385 transitions. Word has length 380 [2022-12-14 08:54:32,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:32,167 INFO L495 AbstractCegarLoop]: Abstraction has 383 states and 385 transitions. [2022-12-14 08:54:32,168 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 191 states, 191 states have (on average 3.329842931937173) internal successors, (636), 191 states have internal predecessors, (636), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:32,168 INFO L276 IsEmpty]: Start isEmpty. Operand 383 states and 385 transitions. [2022-12-14 08:54:32,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 383 [2022-12-14 08:54:32,169 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:32,169 INFO L195 NwaCegarLoop]: trace histogram [63, 63, 62, 62, 62, 62, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:54:32,174 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Ended with exit code 0 [2022-12-14 08:54:32,369 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable93 [2022-12-14 08:54:32,370 INFO L420 AbstractCegarLoop]: === Iteration 95 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:32,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:32,371 INFO L85 PathProgramCache]: Analyzing trace with hash -538347520, now seen corresponding path program 92 times [2022-12-14 08:54:32,371 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:32,371 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135930029] [2022-12-14 08:54:32,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:32,372 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:32,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:38,206 INFO L134 CoverageAnalysis]: Checked inductivity of 11594 backedges. 7505 proven. 4089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:38,206 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:38,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135930029] [2022-12-14 08:54:38,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135930029] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:38,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [890664188] [2022-12-14 08:54:38,206 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:54:38,207 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:38,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:38,207 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:38,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Waiting until timeout for monitored process [2022-12-14 08:54:38,561 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 63 check-sat command(s) [2022-12-14 08:54:38,561 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:38,568 INFO L263 TraceCheckSpWp]: Trace formula consists of 1411 conjuncts, 128 conjunts are in the unsatisfiable core [2022-12-14 08:54:38,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:42,805 INFO L134 CoverageAnalysis]: Checked inductivity of 11594 backedges. 7688 proven. 3906 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:42,805 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:46,134 INFO L134 CoverageAnalysis]: Checked inductivity of 11594 backedges. 7688 proven. 3906 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:46,134 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [890664188] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:46,134 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2103377319] [2022-12-14 08:54:46,135 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:54:46,135 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:46,135 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:46,135 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:46,135 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:46,215 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:54:47,130 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '199482#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:54:47,130 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:54:47,131 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:54:47,131 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [128, 128, 128] total 193 [2022-12-14 08:54:47,131 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [922010576] [2022-12-14 08:54:47,131 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:54:47,131 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2022-12-14 08:54:47,131 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:54:47,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2022-12-14 08:54:47,134 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8477, Invalid=32125, Unknown=0, NotChecked=0, Total=40602 [2022-12-14 08:54:47,135 INFO L87 Difference]: Start difference. First operand 383 states and 385 transitions. Second operand has 193 states, 193 states have (on average 3.305699481865285) internal successors, (638), 193 states have internal predecessors, (638), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:51,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:54:51,649 INFO L93 Difference]: Finished difference Result 829 states and 895 transitions. [2022-12-14 08:54:51,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2022-12-14 08:54:51,650 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 3.305699481865285) internal successors, (638), 193 states have internal predecessors, (638), 0 states have call successors, (0), 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 382 [2022-12-14 08:54:51,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:54:51,651 INFO L225 Difference]: With dead ends: 829 [2022-12-14 08:54:51,651 INFO L226 Difference]: Without dead ends: 574 [2022-12-14 08:54:51,654 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1335 GetRequests, 948 SyntacticMatches, 124 SemanticMatches, 263 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26644 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=16543, Invalid=53417, Unknown=0, NotChecked=0, Total=69960 [2022-12-14 08:54:51,654 INFO L413 NwaCegarLoop]: 128 mSDtfsCounter, 614 mSDsluCounter, 1584 mSDsCounter, 0 mSdLazyCounter, 1781 mSolverCounterSat, 277 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 614 SdHoareTripleChecker+Valid, 1712 SdHoareTripleChecker+Invalid, 2058 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 277 IncrementalHoareTripleChecker+Valid, 1781 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 08:54:51,654 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [614 Valid, 1712 Invalid, 2058 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [277 Valid, 1781 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 08:54:51,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 574 states. [2022-12-14 08:54:51,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 574 to 385. [2022-12-14 08:54:51,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 384 states have (on average 1.0078125) internal successors, (387), 384 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:51,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 387 transitions. [2022-12-14 08:54:51,722 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 387 transitions. Word has length 382 [2022-12-14 08:54:51,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:54:51,722 INFO L495 AbstractCegarLoop]: Abstraction has 385 states and 387 transitions. [2022-12-14 08:54:51,722 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 3.305699481865285) internal successors, (638), 193 states have internal predecessors, (638), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:54:51,722 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 387 transitions. [2022-12-14 08:54:51,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 385 [2022-12-14 08:54:51,723 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:54:51,723 INFO L195 NwaCegarLoop]: trace histogram [64, 63, 63, 62, 62, 62, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:54:51,729 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Ended with exit code 0 [2022-12-14 08:54:51,924 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable94,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:51,924 INFO L420 AbstractCegarLoop]: === Iteration 96 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:54:51,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:54:51,925 INFO L85 PathProgramCache]: Analyzing trace with hash -967142747, now seen corresponding path program 93 times [2022-12-14 08:54:51,925 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:54:51,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [328304267] [2022-12-14 08:54:51,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:54:51,926 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:54:52,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:54:56,775 INFO L134 CoverageAnalysis]: Checked inductivity of 11720 backedges. 3906 proven. 7814 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:56,775 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:54:56,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [328304267] [2022-12-14 08:54:56,776 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [328304267] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:54:56,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1084253327] [2022-12-14 08:54:56,776 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:54:56,776 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:54:56,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:54:56,777 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:54:56,777 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2022-12-14 08:54:56,931 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:54:56,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:54:56,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 1421 conjuncts, 132 conjunts are in the unsatisfiable core [2022-12-14 08:54:56,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:54:57,263 INFO L134 CoverageAnalysis]: Checked inductivity of 11720 backedges. 4032 proven. 7688 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:57,264 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:54:59,630 INFO L134 CoverageAnalysis]: Checked inductivity of 11720 backedges. 4032 proven. 7688 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:54:59,630 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1084253327] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:54:59,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1479752670] [2022-12-14 08:54:59,631 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:54:59,631 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:54:59,631 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:54:59,631 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:54:59,631 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:54:59,722 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:00,215 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '203768#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:00,215 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:00,215 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:00,215 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 66, 66] total 69 [2022-12-14 08:55:00,215 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699947595] [2022-12-14 08:55:00,215 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:00,216 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-12-14 08:55:00,216 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:00,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-12-14 08:55:00,217 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2263, Invalid=3899, Unknown=0, NotChecked=0, Total=6162 [2022-12-14 08:55:00,217 INFO L87 Difference]: Start difference. First operand 385 states and 387 transitions. Second operand has 70 states, 70 states have (on average 5.785714285714286) internal successors, (405), 69 states have internal predecessors, (405), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:01,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:01,630 INFO L93 Difference]: Finished difference Result 402 states and 405 transitions. [2022-12-14 08:55:01,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2022-12-14 08:55:01,631 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 5.785714285714286) internal successors, (405), 69 states have internal predecessors, (405), 0 states have call successors, (0), 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 384 [2022-12-14 08:55:01,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:01,632 INFO L225 Difference]: With dead ends: 402 [2022-12-14 08:55:01,632 INFO L226 Difference]: Without dead ends: 400 [2022-12-14 08:55:01,633 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1344 GetRequests, 1077 SyntacticMatches, 124 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9884 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=6822, Invalid=14058, Unknown=0, NotChecked=0, Total=20880 [2022-12-14 08:55:01,633 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 206 mSDsluCounter, 497 mSDsCounter, 0 mSdLazyCounter, 674 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 206 SdHoareTripleChecker+Valid, 569 SdHoareTripleChecker+Invalid, 678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 674 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:01,633 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [206 Valid, 569 Invalid, 678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 674 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:55:01,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 400 states. [2022-12-14 08:55:01,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 400 to 393. [2022-12-14 08:55:01,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 393 states, 392 states have (on average 1.0076530612244898) internal successors, (395), 392 states have internal predecessors, (395), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:01,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 393 states to 393 states and 395 transitions. [2022-12-14 08:55:01,709 INFO L78 Accepts]: Start accepts. Automaton has 393 states and 395 transitions. Word has length 384 [2022-12-14 08:55:01,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:01,709 INFO L495 AbstractCegarLoop]: Abstraction has 393 states and 395 transitions. [2022-12-14 08:55:01,710 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 5.785714285714286) internal successors, (405), 69 states have internal predecessors, (405), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:01,710 INFO L276 IsEmpty]: Start isEmpty. Operand 393 states and 395 transitions. [2022-12-14 08:55:01,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 393 [2022-12-14 08:55:01,711 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:01,711 INFO L195 NwaCegarLoop]: trace histogram [65, 64, 64, 64, 64, 63, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:55:01,716 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Ended with exit code 0 [2022-12-14 08:55:01,911 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95,94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:01,912 INFO L420 AbstractCegarLoop]: === Iteration 97 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:01,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:01,913 INFO L85 PathProgramCache]: Analyzing trace with hash 227569547, now seen corresponding path program 94 times [2022-12-14 08:55:01,913 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:01,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290949177] [2022-12-14 08:55:01,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:01,914 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:02,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:08,661 INFO L134 CoverageAnalysis]: Checked inductivity of 12224 backedges. 8003 proven. 4221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:08,661 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:08,661 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290949177] [2022-12-14 08:55:08,661 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1290949177] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:08,662 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2041290088] [2022-12-14 08:55:08,662 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:55:08,662 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:08,662 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:08,663 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:08,663 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Waiting until timeout for monitored process [2022-12-14 08:55:08,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:08,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 1445 conjuncts, 130 conjunts are in the unsatisfiable core [2022-12-14 08:55:08,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:13,457 INFO L134 CoverageAnalysis]: Checked inductivity of 12224 backedges. 8190 proven. 4032 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:55:13,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:16,717 INFO L134 CoverageAnalysis]: Checked inductivity of 12224 backedges. 8190 proven. 4032 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:55:16,717 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2041290088] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:16,717 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1609927868] [2022-12-14 08:55:16,717 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:55:16,718 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:16,718 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:16,718 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:16,718 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:16,789 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:17,634 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '207638#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:17,634 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:17,634 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:17,635 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [131, 130, 130] total 197 [2022-12-14 08:55:17,635 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409350918] [2022-12-14 08:55:17,635 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:17,635 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 197 states [2022-12-14 08:55:17,635 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:17,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 197 interpolants. [2022-12-14 08:55:17,638 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8805, Invalid=33425, Unknown=0, NotChecked=0, Total=42230 [2022-12-14 08:55:17,639 INFO L87 Difference]: Start difference. First operand 393 states and 395 transitions. Second operand has 197 states, 197 states have (on average 3.3299492385786804) internal successors, (656), 197 states have internal predecessors, (656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:22,115 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:22,115 INFO L93 Difference]: Finished difference Result 848 states and 915 transitions. [2022-12-14 08:55:22,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2022-12-14 08:55:22,115 INFO L78 Accepts]: Start accepts. Automaton has has 197 states, 197 states have (on average 3.3299492385786804) internal successors, (656), 197 states have internal predecessors, (656), 0 states have call successors, (0), 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 392 [2022-12-14 08:55:22,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:22,118 INFO L225 Difference]: With dead ends: 848 [2022-12-14 08:55:22,118 INFO L226 Difference]: Without dead ends: 587 [2022-12-14 08:55:22,122 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1369 GetRequests, 975 SyntacticMatches, 126 SemanticMatches, 268 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27715 ImplicationChecksByTransitivity, 12.5s TimeCoverageRelationStatistics Valid=17127, Invalid=55503, Unknown=0, NotChecked=0, Total=72630 [2022-12-14 08:55:22,122 INFO L413 NwaCegarLoop]: 130 mSDtfsCounter, 599 mSDsluCounter, 1688 mSDsCounter, 0 mSdLazyCounter, 1888 mSolverCounterSat, 269 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 599 SdHoareTripleChecker+Valid, 1818 SdHoareTripleChecker+Invalid, 2157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 269 IncrementalHoareTripleChecker+Valid, 1888 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:22,122 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [599 Valid, 1818 Invalid, 2157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [269 Valid, 1888 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 08:55:22,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 587 states. [2022-12-14 08:55:22,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 587 to 395. [2022-12-14 08:55:22,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 395 states, 394 states have (on average 1.0076142131979695) internal successors, (397), 394 states have internal predecessors, (397), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:22,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 397 transitions. [2022-12-14 08:55:22,202 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 397 transitions. Word has length 392 [2022-12-14 08:55:22,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:22,202 INFO L495 AbstractCegarLoop]: Abstraction has 395 states and 397 transitions. [2022-12-14 08:55:22,202 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 197 states, 197 states have (on average 3.3299492385786804) internal successors, (656), 197 states have internal predecessors, (656), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:22,202 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 397 transitions. [2022-12-14 08:55:22,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 395 [2022-12-14 08:55:22,204 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:22,204 INFO L195 NwaCegarLoop]: trace histogram [65, 65, 64, 64, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:55:22,209 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Ended with exit code 0 [2022-12-14 08:55:22,404 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:22,404 INFO L420 AbstractCegarLoop]: === Iteration 98 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:22,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:22,405 INFO L85 PathProgramCache]: Analyzing trace with hash -1940897808, now seen corresponding path program 95 times [2022-12-14 08:55:22,405 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:22,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1157659719] [2022-12-14 08:55:22,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:22,405 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:22,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:29,224 INFO L134 CoverageAnalysis]: Checked inductivity of 12352 backedges. 8003 proven. 4349 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:29,224 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:29,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1157659719] [2022-12-14 08:55:29,224 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1157659719] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:29,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [370305205] [2022-12-14 08:55:29,225 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:55:29,225 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:29,225 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:29,225 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:29,226 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Waiting until timeout for monitored process [2022-12-14 08:55:29,595 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 65 check-sat command(s) [2022-12-14 08:55:29,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:55:29,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 1455 conjuncts, 132 conjunts are in the unsatisfiable core [2022-12-14 08:55:29,607 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:33,938 INFO L134 CoverageAnalysis]: Checked inductivity of 12352 backedges. 8192 proven. 4160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:33,938 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:38,216 INFO L134 CoverageAnalysis]: Checked inductivity of 12352 backedges. 8192 proven. 4160 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:38,216 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [370305205] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:38,216 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [219435253] [2022-12-14 08:55:38,217 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:55:38,217 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:38,217 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:38,217 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:38,218 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:38,305 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:39,179 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '212158#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:39,179 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:39,179 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:39,179 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [132, 132, 132] total 199 [2022-12-14 08:55:39,180 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [576160808] [2022-12-14 08:55:39,180 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:39,181 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 199 states [2022-12-14 08:55:39,181 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:39,183 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 199 interpolants. [2022-12-14 08:55:39,185 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9005, Invalid=34051, Unknown=0, NotChecked=0, Total=43056 [2022-12-14 08:55:39,185 INFO L87 Difference]: Start difference. First operand 395 states and 397 transitions. Second operand has 199 states, 199 states have (on average 3.306532663316583) internal successors, (658), 199 states have internal predecessors, (658), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:44,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:44,050 INFO L93 Difference]: Finished difference Result 855 states and 923 transitions. [2022-12-14 08:55:44,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2022-12-14 08:55:44,050 INFO L78 Accepts]: Start accepts. Automaton has has 199 states, 199 states have (on average 3.306532663316583) internal successors, (658), 199 states have internal predecessors, (658), 0 states have call successors, (0), 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 394 [2022-12-14 08:55:44,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:44,051 INFO L225 Difference]: With dead ends: 855 [2022-12-14 08:55:44,051 INFO L226 Difference]: Without dead ends: 592 [2022-12-14 08:55:44,054 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1377 GetRequests, 978 SyntacticMatches, 128 SemanticMatches, 271 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28270 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=17587, Invalid=56669, Unknown=0, NotChecked=0, Total=74256 [2022-12-14 08:55:44,054 INFO L413 NwaCegarLoop]: 132 mSDtfsCounter, 702 mSDsluCounter, 1572 mSDsCounter, 0 mSdLazyCounter, 1775 mSolverCounterSat, 320 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 702 SdHoareTripleChecker+Valid, 1704 SdHoareTripleChecker+Invalid, 2095 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 320 IncrementalHoareTripleChecker+Valid, 1775 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:44,054 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [702 Valid, 1704 Invalid, 2095 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [320 Valid, 1775 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 08:55:44,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 592 states. [2022-12-14 08:55:44,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 592 to 397. [2022-12-14 08:55:44,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 397 states, 396 states have (on average 1.0075757575757576) internal successors, (399), 396 states have internal predecessors, (399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:44,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 397 states to 397 states and 399 transitions. [2022-12-14 08:55:44,127 INFO L78 Accepts]: Start accepts. Automaton has 397 states and 399 transitions. Word has length 394 [2022-12-14 08:55:44,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:44,127 INFO L495 AbstractCegarLoop]: Abstraction has 397 states and 399 transitions. [2022-12-14 08:55:44,127 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 199 states, 199 states have (on average 3.306532663316583) internal successors, (658), 199 states have internal predecessors, (658), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:44,127 INFO L276 IsEmpty]: Start isEmpty. Operand 397 states and 399 transitions. [2022-12-14 08:55:44,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 397 [2022-12-14 08:55:44,128 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:44,128 INFO L195 NwaCegarLoop]: trace histogram [66, 65, 65, 64, 64, 64, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:55:44,134 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Ended with exit code 0 [2022-12-14 08:55:44,328 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable97,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:44,329 INFO L420 AbstractCegarLoop]: === Iteration 99 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:44,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:44,330 INFO L85 PathProgramCache]: Analyzing trace with hash 1516079893, now seen corresponding path program 96 times [2022-12-14 08:55:44,330 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:44,330 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889706760] [2022-12-14 08:55:44,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:44,331 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:44,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:55:49,115 INFO L134 CoverageAnalysis]: Checked inductivity of 12482 backedges. 4160 proven. 8322 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:49,116 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:55:49,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889706760] [2022-12-14 08:55:49,116 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [889706760] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:55:49,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [761064577] [2022-12-14 08:55:49,116 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:55:49,116 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:55:49,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:55:49,117 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:55:49,118 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2022-12-14 08:55:49,270 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:55:49,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:55:49,279 INFO L263 TraceCheckSpWp]: Trace formula consists of 1465 conjuncts, 136 conjunts are in the unsatisfiable core [2022-12-14 08:55:49,282 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:55:49,622 INFO L134 CoverageAnalysis]: Checked inductivity of 12482 backedges. 4290 proven. 8192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:49,622 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:55:52,075 INFO L134 CoverageAnalysis]: Checked inductivity of 12482 backedges. 4290 proven. 8192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:55:52,075 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [761064577] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:55:52,075 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2128890130] [2022-12-14 08:55:52,076 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:55:52,076 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:55:52,077 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:55:52,077 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:55:52,077 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:55:52,168 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:55:52,662 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '216578#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:55:52,662 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:55:52,662 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:55:52,662 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 68, 68] total 71 [2022-12-14 08:55:52,662 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454000086] [2022-12-14 08:55:52,663 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:55:52,663 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2022-12-14 08:55:52,663 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:55:52,664 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2022-12-14 08:55:52,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2398, Invalid=4082, Unknown=0, NotChecked=0, Total=6480 [2022-12-14 08:55:52,665 INFO L87 Difference]: Start difference. First operand 397 states and 399 transitions. Second operand has 72 states, 72 states have (on average 5.791666666666667) internal successors, (417), 71 states have internal predecessors, (417), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:54,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:55:54,245 INFO L93 Difference]: Finished difference Result 414 states and 417 transitions. [2022-12-14 08:55:54,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 138 states. [2022-12-14 08:55:54,245 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 5.791666666666667) internal successors, (417), 71 states have internal predecessors, (417), 0 states have call successors, (0), 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 396 [2022-12-14 08:55:54,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:55:54,247 INFO L225 Difference]: With dead ends: 414 [2022-12-14 08:55:54,247 INFO L226 Difference]: Without dead ends: 412 [2022-12-14 08:55:54,249 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1386 GetRequests, 1111 SyntacticMatches, 128 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10456 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=7231, Invalid=14821, Unknown=0, NotChecked=0, Total=22052 [2022-12-14 08:55:54,249 INFO L413 NwaCegarLoop]: 74 mSDtfsCounter, 210 mSDsluCounter, 602 mSDsCounter, 0 mSdLazyCounter, 793 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 676 SdHoareTripleChecker+Invalid, 797 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 793 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:55:54,249 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [210 Valid, 676 Invalid, 797 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 793 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:55:54,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 412 states. [2022-12-14 08:55:54,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 412 to 405. [2022-12-14 08:55:54,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 405 states, 404 states have (on average 1.0074257425742574) internal successors, (407), 404 states have internal predecessors, (407), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:54,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 405 states to 405 states and 407 transitions. [2022-12-14 08:55:54,331 INFO L78 Accepts]: Start accepts. Automaton has 405 states and 407 transitions. Word has length 396 [2022-12-14 08:55:54,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:55:54,332 INFO L495 AbstractCegarLoop]: Abstraction has 405 states and 407 transitions. [2022-12-14 08:55:54,332 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 5.791666666666667) internal successors, (417), 71 states have internal predecessors, (417), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:55:54,332 INFO L276 IsEmpty]: Start isEmpty. Operand 405 states and 407 transitions. [2022-12-14 08:55:54,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 405 [2022-12-14 08:55:54,333 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:55:54,333 INFO L195 NwaCegarLoop]: trace histogram [67, 66, 66, 66, 66, 65, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:55:54,340 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Ended with exit code 0 [2022-12-14 08:55:54,533 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable98 [2022-12-14 08:55:54,534 INFO L420 AbstractCegarLoop]: === Iteration 100 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:55:54,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:55:54,535 INFO L85 PathProgramCache]: Analyzing trace with hash -1458833413, now seen corresponding path program 97 times [2022-12-14 08:55:54,535 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:55:54,535 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [105887106] [2022-12-14 08:55:54,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:55:54,536 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:55:54,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:01,590 INFO L134 CoverageAnalysis]: Checked inductivity of 13002 backedges. 8517 proven. 4485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:01,590 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:56:01,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [105887106] [2022-12-14 08:56:01,590 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [105887106] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:56:01,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [256133118] [2022-12-14 08:56:01,590 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:56:01,590 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:01,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:56:01,591 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:56:01,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Waiting until timeout for monitored process [2022-12-14 08:56:01,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:01,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 1489 conjuncts, 134 conjunts are in the unsatisfiable core [2022-12-14 08:56:01,755 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:56:06,926 INFO L134 CoverageAnalysis]: Checked inductivity of 13002 backedges. 8710 proven. 4290 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:56:06,926 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:56:10,619 INFO L134 CoverageAnalysis]: Checked inductivity of 13002 backedges. 8710 proven. 4290 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:56:10,619 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [256133118] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:56:10,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1416440662] [2022-12-14 08:56:10,620 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:56:10,620 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:56:10,620 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:56:10,620 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:56:10,620 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:56:10,680 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:56:11,583 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '220566#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:56:11,583 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:56:11,584 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:56:11,584 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [135, 134, 134] total 203 [2022-12-14 08:56:11,584 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664502345] [2022-12-14 08:56:11,584 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:56:11,584 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 203 states [2022-12-14 08:56:11,584 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:56:11,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 203 interpolants. [2022-12-14 08:56:11,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9343, Invalid=35389, Unknown=0, NotChecked=0, Total=44732 [2022-12-14 08:56:11,588 INFO L87 Difference]: Start difference. First operand 405 states and 407 transitions. Second operand has 203 states, 203 states have (on average 3.3300492610837438) internal successors, (676), 203 states have internal predecessors, (676), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:16,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:56:16,605 INFO L93 Difference]: Finished difference Result 874 states and 943 transitions. [2022-12-14 08:56:16,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2022-12-14 08:56:16,606 INFO L78 Accepts]: Start accepts. Automaton has has 203 states, 203 states have (on average 3.3300492610837438) internal successors, (676), 203 states have internal predecessors, (676), 0 states have call successors, (0), 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 404 [2022-12-14 08:56:16,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:56:16,607 INFO L225 Difference]: With dead ends: 874 [2022-12-14 08:56:16,608 INFO L226 Difference]: Without dead ends: 605 [2022-12-14 08:56:16,613 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1411 GetRequests, 1005 SyntacticMatches, 130 SemanticMatches, 276 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29373 ImplicationChecksByTransitivity, 13.6s TimeCoverageRelationStatistics Valid=18189, Invalid=58817, Unknown=0, NotChecked=0, Total=77006 [2022-12-14 08:56:16,614 INFO L413 NwaCegarLoop]: 134 mSDtfsCounter, 669 mSDsluCounter, 1962 mSDsCounter, 0 mSdLazyCounter, 2172 mSolverCounterSat, 302 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 669 SdHoareTripleChecker+Valid, 2096 SdHoareTripleChecker+Invalid, 2474 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 302 IncrementalHoareTripleChecker+Valid, 2172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-12-14 08:56:16,614 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [669 Valid, 2096 Invalid, 2474 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [302 Valid, 2172 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-12-14 08:56:16,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 605 states. [2022-12-14 08:56:16,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 605 to 407. [2022-12-14 08:56:16,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 407 states, 406 states have (on average 1.0073891625615763) internal successors, (409), 406 states have internal predecessors, (409), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:16,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 409 transitions. [2022-12-14 08:56:16,700 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 409 transitions. Word has length 404 [2022-12-14 08:56:16,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:56:16,700 INFO L495 AbstractCegarLoop]: Abstraction has 407 states and 409 transitions. [2022-12-14 08:56:16,701 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 203 states, 203 states have (on average 3.3300492610837438) internal successors, (676), 203 states have internal predecessors, (676), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:16,701 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 409 transitions. [2022-12-14 08:56:16,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 407 [2022-12-14 08:56:16,702 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:56:16,702 INFO L195 NwaCegarLoop]: trace histogram [67, 67, 66, 66, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:56:16,707 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Ended with exit code 0 [2022-12-14 08:56:16,903 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable99 [2022-12-14 08:56:16,903 INFO L420 AbstractCegarLoop]: === Iteration 101 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:56:16,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:56:16,904 INFO L85 PathProgramCache]: Analyzing trace with hash -1874503456, now seen corresponding path program 98 times [2022-12-14 08:56:16,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:56:16,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1932906647] [2022-12-14 08:56:16,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:56:16,905 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:56:17,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:24,414 INFO L134 CoverageAnalysis]: Checked inductivity of 13134 backedges. 8517 proven. 4617 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:24,414 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:56:24,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1932906647] [2022-12-14 08:56:24,414 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1932906647] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:56:24,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [348201165] [2022-12-14 08:56:24,414 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:56:24,414 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:24,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:56:24,415 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:56:24,415 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Waiting until timeout for monitored process [2022-12-14 08:56:24,771 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 67 check-sat command(s) [2022-12-14 08:56:24,771 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:56:24,779 INFO L263 TraceCheckSpWp]: Trace formula consists of 1499 conjuncts, 136 conjunts are in the unsatisfiable core [2022-12-14 08:56:24,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:56:30,342 INFO L134 CoverageAnalysis]: Checked inductivity of 13134 backedges. 8712 proven. 4422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:30,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:56:34,402 INFO L134 CoverageAnalysis]: Checked inductivity of 13134 backedges. 8712 proven. 4422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:34,402 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [348201165] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:56:34,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [863361155] [2022-12-14 08:56:34,403 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:56:34,403 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:56:34,403 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:56:34,404 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:56:34,404 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:56:34,480 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:56:35,528 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '225224#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:56:35,528 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:56:35,528 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:56:35,528 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [136, 136, 136] total 205 [2022-12-14 08:56:35,528 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653787923] [2022-12-14 08:56:35,528 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:56:35,529 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 205 states [2022-12-14 08:56:35,529 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:56:35,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 205 interpolants. [2022-12-14 08:56:35,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9549, Invalid=36033, Unknown=0, NotChecked=0, Total=45582 [2022-12-14 08:56:35,532 INFO L87 Difference]: Start difference. First operand 407 states and 409 transitions. Second operand has 205 states, 205 states have (on average 3.3073170731707315) internal successors, (678), 205 states have internal predecessors, (678), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:40,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:56:40,313 INFO L93 Difference]: Finished difference Result 881 states and 951 transitions. [2022-12-14 08:56:40,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2022-12-14 08:56:40,314 INFO L78 Accepts]: Start accepts. Automaton has has 205 states, 205 states have (on average 3.3073170731707315) internal successors, (678), 205 states have internal predecessors, (678), 0 states have call successors, (0), 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 406 [2022-12-14 08:56:40,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:56:40,315 INFO L225 Difference]: With dead ends: 881 [2022-12-14 08:56:40,315 INFO L226 Difference]: Without dead ends: 610 [2022-12-14 08:56:40,318 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1419 GetRequests, 1008 SyntacticMatches, 132 SemanticMatches, 279 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29944 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=18663, Invalid=60017, Unknown=0, NotChecked=0, Total=78680 [2022-12-14 08:56:40,318 INFO L413 NwaCegarLoop]: 136 mSDtfsCounter, 658 mSDsluCounter, 1496 mSDsCounter, 0 mSdLazyCounter, 1692 mSolverCounterSat, 296 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 658 SdHoareTripleChecker+Valid, 1632 SdHoareTripleChecker+Invalid, 1988 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 296 IncrementalHoareTripleChecker+Valid, 1692 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 08:56:40,318 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [658 Valid, 1632 Invalid, 1988 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [296 Valid, 1692 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 08:56:40,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 610 states. [2022-12-14 08:56:40,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 610 to 409. [2022-12-14 08:56:40,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 409 states, 408 states have (on average 1.0073529411764706) internal successors, (411), 408 states have internal predecessors, (411), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:40,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 411 transitions. [2022-12-14 08:56:40,395 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 411 transitions. Word has length 406 [2022-12-14 08:56:40,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:56:40,395 INFO L495 AbstractCegarLoop]: Abstraction has 409 states and 411 transitions. [2022-12-14 08:56:40,396 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 205 states, 205 states have (on average 3.3073170731707315) internal successors, (678), 205 states have internal predecessors, (678), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:40,396 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 411 transitions. [2022-12-14 08:56:40,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 409 [2022-12-14 08:56:40,397 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:56:40,397 INFO L195 NwaCegarLoop]: trace histogram [68, 67, 67, 66, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:56:40,403 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Ended with exit code 0 [2022-12-14 08:56:40,597 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable100,99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:40,598 INFO L420 AbstractCegarLoop]: === Iteration 102 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:56:40,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:56:40,598 INFO L85 PathProgramCache]: Analyzing trace with hash -1901456251, now seen corresponding path program 99 times [2022-12-14 08:56:40,599 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:56:40,599 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [897153575] [2022-12-14 08:56:40,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:56:40,599 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:56:40,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:45,392 INFO L134 CoverageAnalysis]: Checked inductivity of 13268 backedges. 4422 proven. 8846 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:45,392 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:56:45,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [897153575] [2022-12-14 08:56:45,392 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [897153575] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:56:45,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1660920975] [2022-12-14 08:56:45,392 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:56:45,392 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:45,392 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:56:45,393 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:56:45,394 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2022-12-14 08:56:45,538 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:56:45,539 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:56:45,547 INFO L263 TraceCheckSpWp]: Trace formula consists of 1509 conjuncts, 140 conjunts are in the unsatisfiable core [2022-12-14 08:56:45,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:56:45,920 INFO L134 CoverageAnalysis]: Checked inductivity of 13268 backedges. 4556 proven. 8712 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:45,920 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:56:48,242 INFO L134 CoverageAnalysis]: Checked inductivity of 13268 backedges. 4556 proven. 8712 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:48,242 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1660920975] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:56:48,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [856440761] [2022-12-14 08:56:48,243 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:56:48,243 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:56:48,243 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:56:48,243 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:56:48,243 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:56:48,322 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:56:48,804 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '229778#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:56:48,804 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:56:48,804 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:56:48,804 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70, 70] total 73 [2022-12-14 08:56:48,804 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481490920] [2022-12-14 08:56:48,805 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:56:48,805 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2022-12-14 08:56:48,805 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:56:48,806 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2022-12-14 08:56:48,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2537, Invalid=4269, Unknown=0, NotChecked=0, Total=6806 [2022-12-14 08:56:48,807 INFO L87 Difference]: Start difference. First operand 409 states and 411 transitions. Second operand has 74 states, 74 states have (on average 5.797297297297297) internal successors, (429), 73 states have internal predecessors, (429), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:50,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:56:50,714 INFO L93 Difference]: Finished difference Result 426 states and 429 transitions. [2022-12-14 08:56:50,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2022-12-14 08:56:50,715 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 5.797297297297297) internal successors, (429), 73 states have internal predecessors, (429), 0 states have call successors, (0), 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 408 [2022-12-14 08:56:50,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:56:50,716 INFO L225 Difference]: With dead ends: 426 [2022-12-14 08:56:50,716 INFO L226 Difference]: Without dead ends: 424 [2022-12-14 08:56:50,717 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1428 GetRequests, 1145 SyntacticMatches, 132 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11044 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=7652, Invalid=15604, Unknown=0, NotChecked=0, Total=23256 [2022-12-14 08:56:50,718 INFO L413 NwaCegarLoop]: 76 mSDtfsCounter, 219 mSDsluCounter, 575 mSDsCounter, 0 mSdLazyCounter, 764 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 651 SdHoareTripleChecker+Invalid, 768 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 764 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 08:56:50,718 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [219 Valid, 651 Invalid, 768 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 764 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 08:56:50,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2022-12-14 08:56:50,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 417. [2022-12-14 08:56:50,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 417 states, 416 states have (on average 1.0072115384615385) internal successors, (419), 416 states have internal predecessors, (419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:50,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 417 states to 417 states and 419 transitions. [2022-12-14 08:56:50,796 INFO L78 Accepts]: Start accepts. Automaton has 417 states and 419 transitions. Word has length 408 [2022-12-14 08:56:50,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:56:50,796 INFO L495 AbstractCegarLoop]: Abstraction has 417 states and 419 transitions. [2022-12-14 08:56:50,797 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 5.797297297297297) internal successors, (429), 73 states have internal predecessors, (429), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:56:50,797 INFO L276 IsEmpty]: Start isEmpty. Operand 417 states and 419 transitions. [2022-12-14 08:56:50,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 417 [2022-12-14 08:56:50,798 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:56:50,798 INFO L195 NwaCegarLoop]: trace histogram [69, 68, 68, 68, 68, 67, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:56:50,803 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Forceful destruction successful, exit code 0 [2022-12-14 08:56:50,998 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable101 [2022-12-14 08:56:50,999 INFO L420 AbstractCegarLoop]: === Iteration 103 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:56:50,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:56:50,999 INFO L85 PathProgramCache]: Analyzing trace with hash 1320161643, now seen corresponding path program 100 times [2022-12-14 08:56:50,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:56:50,999 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105929276] [2022-12-14 08:56:50,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:56:51,000 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:56:51,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:59,173 INFO L134 CoverageAnalysis]: Checked inductivity of 13804 backedges. 9047 proven. 4757 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:56:59,173 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:56:59,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1105929276] [2022-12-14 08:56:59,173 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1105929276] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:56:59,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [416790712] [2022-12-14 08:56:59,174 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:56:59,174 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:56:59,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:56:59,174 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:56:59,175 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Waiting until timeout for monitored process [2022-12-14 08:56:59,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:56:59,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 1533 conjuncts, 138 conjunts are in the unsatisfiable core [2022-12-14 08:56:59,395 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:57:04,485 INFO L134 CoverageAnalysis]: Checked inductivity of 13804 backedges. 9246 proven. 4556 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:57:04,485 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:57:09,064 INFO L134 CoverageAnalysis]: Checked inductivity of 13804 backedges. 9246 proven. 4556 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:57:09,064 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [416790712] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:57:09,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1593326964] [2022-12-14 08:57:09,065 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:57:09,065 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:57:09,065 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:57:09,065 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:57:09,065 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:57:09,130 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:57:10,129 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '233884#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:57:10,129 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:57:10,129 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:57:10,129 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [139, 138, 138] total 209 [2022-12-14 08:57:10,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186399195] [2022-12-14 08:57:10,129 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:57:10,130 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 209 states [2022-12-14 08:57:10,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:57:10,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 209 interpolants. [2022-12-14 08:57:10,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9897, Invalid=37409, Unknown=0, NotChecked=0, Total=47306 [2022-12-14 08:57:10,133 INFO L87 Difference]: Start difference. First operand 417 states and 419 transitions. Second operand has 209 states, 209 states have (on average 3.3301435406698565) internal successors, (696), 209 states have internal predecessors, (696), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:15,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:57:15,148 INFO L93 Difference]: Finished difference Result 900 states and 971 transitions. [2022-12-14 08:57:15,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 138 states. [2022-12-14 08:57:15,149 INFO L78 Accepts]: Start accepts. Automaton has has 209 states, 209 states have (on average 3.3301435406698565) internal successors, (696), 209 states have internal predecessors, (696), 0 states have call successors, (0), 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 416 [2022-12-14 08:57:15,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:57:15,150 INFO L225 Difference]: With dead ends: 900 [2022-12-14 08:57:15,150 INFO L226 Difference]: Without dead ends: 623 [2022-12-14 08:57:15,153 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1453 GetRequests, 1035 SyntacticMatches, 134 SemanticMatches, 284 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31079 ImplicationChecksByTransitivity, 15.5s TimeCoverageRelationStatistics Valid=19283, Invalid=62227, Unknown=0, NotChecked=0, Total=81510 [2022-12-14 08:57:15,153 INFO L413 NwaCegarLoop]: 138 mSDtfsCounter, 715 mSDsluCounter, 1622 mSDsCounter, 0 mSdLazyCounter, 1828 mSolverCounterSat, 325 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 715 SdHoareTripleChecker+Valid, 1760 SdHoareTripleChecker+Invalid, 2153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 325 IncrementalHoareTripleChecker+Valid, 1828 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 08:57:15,153 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [715 Valid, 1760 Invalid, 2153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [325 Valid, 1828 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 08:57:15,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 623 states. [2022-12-14 08:57:15,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 623 to 419. [2022-12-14 08:57:15,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 419 states, 418 states have (on average 1.007177033492823) internal successors, (421), 418 states have internal predecessors, (421), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:15,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 419 states to 419 states and 421 transitions. [2022-12-14 08:57:15,234 INFO L78 Accepts]: Start accepts. Automaton has 419 states and 421 transitions. Word has length 416 [2022-12-14 08:57:15,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:57:15,234 INFO L495 AbstractCegarLoop]: Abstraction has 419 states and 421 transitions. [2022-12-14 08:57:15,235 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 209 states, 209 states have (on average 3.3301435406698565) internal successors, (696), 209 states have internal predecessors, (696), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:15,235 INFO L276 IsEmpty]: Start isEmpty. Operand 419 states and 421 transitions. [2022-12-14 08:57:15,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 419 [2022-12-14 08:57:15,236 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:57:15,236 INFO L195 NwaCegarLoop]: trace histogram [69, 69, 68, 68, 68, 68, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:57:15,241 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Ended with exit code 0 [2022-12-14 08:57:15,436 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable102 [2022-12-14 08:57:15,437 INFO L420 AbstractCegarLoop]: === Iteration 104 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:57:15,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:57:15,438 INFO L85 PathProgramCache]: Analyzing trace with hash -1509014832, now seen corresponding path program 101 times [2022-12-14 08:57:15,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:57:15,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1127005734] [2022-12-14 08:57:15,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:57:15,439 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:57:15,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:22,642 INFO L134 CoverageAnalysis]: Checked inductivity of 13940 backedges. 9047 proven. 4893 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:22,642 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:57:22,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1127005734] [2022-12-14 08:57:22,642 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1127005734] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:57:22,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [417430007] [2022-12-14 08:57:22,642 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:57:22,642 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:22,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:57:22,643 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:57:22,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Waiting until timeout for monitored process [2022-12-14 08:57:23,056 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2022-12-14 08:57:23,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:57:23,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 1543 conjuncts, 140 conjunts are in the unsatisfiable core [2022-12-14 08:57:23,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:57:28,437 INFO L134 CoverageAnalysis]: Checked inductivity of 13940 backedges. 9248 proven. 4692 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:28,437 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:57:32,869 INFO L134 CoverageAnalysis]: Checked inductivity of 13940 backedges. 9248 proven. 4692 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:32,869 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [417430007] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:57:32,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1280675797] [2022-12-14 08:57:32,870 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:57:32,870 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:57:32,870 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:57:32,870 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:57:32,870 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:57:32,927 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:57:33,999 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '238680#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:57:33,999 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:57:33,999 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:57:33,999 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [140, 140, 140] total 211 [2022-12-14 08:57:33,999 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2039319635] [2022-12-14 08:57:33,999 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:57:34,000 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 211 states [2022-12-14 08:57:34,000 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:57:34,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 211 interpolants. [2022-12-14 08:57:34,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10109, Invalid=38071, Unknown=0, NotChecked=0, Total=48180 [2022-12-14 08:57:34,004 INFO L87 Difference]: Start difference. First operand 419 states and 421 transitions. Second operand has 211 states, 211 states have (on average 3.308056872037915) internal successors, (698), 211 states have internal predecessors, (698), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:39,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:57:39,538 INFO L93 Difference]: Finished difference Result 907 states and 979 transitions. [2022-12-14 08:57:39,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 140 states. [2022-12-14 08:57:39,538 INFO L78 Accepts]: Start accepts. Automaton has has 211 states, 211 states have (on average 3.308056872037915) internal successors, (698), 211 states have internal predecessors, (698), 0 states have call successors, (0), 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 418 [2022-12-14 08:57:39,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:57:39,539 INFO L225 Difference]: With dead ends: 907 [2022-12-14 08:57:39,539 INFO L226 Difference]: Without dead ends: 628 [2022-12-14 08:57:39,543 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1461 GetRequests, 1038 SyntacticMatches, 136 SemanticMatches, 287 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31666 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=19771, Invalid=63461, Unknown=0, NotChecked=0, Total=83232 [2022-12-14 08:57:39,543 INFO L413 NwaCegarLoop]: 140 mSDtfsCounter, 640 mSDsluCounter, 1696 mSDsCounter, 0 mSdLazyCounter, 1900 mSolverCounterSat, 287 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 640 SdHoareTripleChecker+Valid, 1836 SdHoareTripleChecker+Invalid, 2187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 287 IncrementalHoareTripleChecker+Valid, 1900 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-12-14 08:57:39,543 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [640 Valid, 1836 Invalid, 2187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [287 Valid, 1900 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-12-14 08:57:39,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 628 states. [2022-12-14 08:57:39,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 628 to 421. [2022-12-14 08:57:39,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 421 states, 420 states have (on average 1.0071428571428571) internal successors, (423), 420 states have internal predecessors, (423), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:39,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 421 states to 421 states and 423 transitions. [2022-12-14 08:57:39,626 INFO L78 Accepts]: Start accepts. Automaton has 421 states and 423 transitions. Word has length 418 [2022-12-14 08:57:39,627 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:57:39,627 INFO L495 AbstractCegarLoop]: Abstraction has 421 states and 423 transitions. [2022-12-14 08:57:39,627 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 211 states, 211 states have (on average 3.308056872037915) internal successors, (698), 211 states have internal predecessors, (698), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:39,627 INFO L276 IsEmpty]: Start isEmpty. Operand 421 states and 423 transitions. [2022-12-14 08:57:39,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 421 [2022-12-14 08:57:39,628 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:57:39,628 INFO L195 NwaCegarLoop]: trace histogram [70, 69, 69, 68, 68, 68, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:57:39,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Forceful destruction successful, exit code 0 [2022-12-14 08:57:39,829 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable103 [2022-12-14 08:57:39,829 INFO L420 AbstractCegarLoop]: === Iteration 105 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:57:39,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:57:39,830 INFO L85 PathProgramCache]: Analyzing trace with hash -1633308939, now seen corresponding path program 102 times [2022-12-14 08:57:39,831 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:57:39,831 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704669245] [2022-12-14 08:57:39,831 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:57:39,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:57:40,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:45,191 INFO L134 CoverageAnalysis]: Checked inductivity of 14078 backedges. 4692 proven. 9386 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:45,192 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:57:45,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704669245] [2022-12-14 08:57:45,192 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [704669245] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:57:45,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [592866200] [2022-12-14 08:57:45,192 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 08:57:45,192 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:45,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:57:45,193 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:57:45,193 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2022-12-14 08:57:45,408 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 08:57:45,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:57:45,419 INFO L263 TraceCheckSpWp]: Trace formula consists of 1553 conjuncts, 144 conjunts are in the unsatisfiable core [2022-12-14 08:57:45,423 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:57:45,768 INFO L134 CoverageAnalysis]: Checked inductivity of 14078 backedges. 4830 proven. 9248 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:45,768 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:57:48,514 INFO L134 CoverageAnalysis]: Checked inductivity of 14078 backedges. 4830 proven. 9248 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:48,514 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [592866200] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:57:48,514 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [204046089] [2022-12-14 08:57:48,515 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:57:48,515 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:57:48,515 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:57:48,515 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:57:48,515 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:57:48,573 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:57:48,986 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '243368#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:57:48,986 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:57:48,986 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:57:48,986 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 75 [2022-12-14 08:57:48,986 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060998564] [2022-12-14 08:57:48,987 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:57:48,987 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2022-12-14 08:57:48,987 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:57:48,987 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2022-12-14 08:57:48,988 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2680, Invalid=4460, Unknown=0, NotChecked=0, Total=7140 [2022-12-14 08:57:48,988 INFO L87 Difference]: Start difference. First operand 421 states and 423 transitions. Second operand has 76 states, 76 states have (on average 5.802631578947368) internal successors, (441), 75 states have internal predecessors, (441), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:50,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:57:50,562 INFO L93 Difference]: Finished difference Result 438 states and 441 transitions. [2022-12-14 08:57:50,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2022-12-14 08:57:50,562 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 5.802631578947368) internal successors, (441), 75 states have internal predecessors, (441), 0 states have call successors, (0), 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 420 [2022-12-14 08:57:50,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:57:50,563 INFO L225 Difference]: With dead ends: 438 [2022-12-14 08:57:50,563 INFO L226 Difference]: Without dead ends: 436 [2022-12-14 08:57:50,564 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1470 GetRequests, 1179 SyntacticMatches, 136 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11648 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=8085, Invalid=16407, Unknown=0, NotChecked=0, Total=24492 [2022-12-14 08:57:50,565 INFO L413 NwaCegarLoop]: 78 mSDtfsCounter, 225 mSDsluCounter, 548 mSDsCounter, 0 mSdLazyCounter, 743 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 626 SdHoareTripleChecker+Invalid, 747 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 743 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 08:57:50,565 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [225 Valid, 626 Invalid, 747 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 743 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 08:57:50,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 436 states. [2022-12-14 08:57:50,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 436 to 429. [2022-12-14 08:57:50,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 429 states, 428 states have (on average 1.0070093457943925) internal successors, (431), 428 states have internal predecessors, (431), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:50,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 431 transitions. [2022-12-14 08:57:50,648 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 431 transitions. Word has length 420 [2022-12-14 08:57:50,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:57:50,648 INFO L495 AbstractCegarLoop]: Abstraction has 429 states and 431 transitions. [2022-12-14 08:57:50,648 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 5.802631578947368) internal successors, (441), 75 states have internal predecessors, (441), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:57:50,648 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 431 transitions. [2022-12-14 08:57:50,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 429 [2022-12-14 08:57:50,650 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:57:50,650 INFO L195 NwaCegarLoop]: trace histogram [71, 70, 70, 70, 70, 69, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:57:50,656 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Forceful destruction successful, exit code 0 [2022-12-14 08:57:50,850 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:50,850 INFO L420 AbstractCegarLoop]: === Iteration 106 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:57:50,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:57:50,851 INFO L85 PathProgramCache]: Analyzing trace with hash 1013070811, now seen corresponding path program 103 times [2022-12-14 08:57:50,851 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:57:50,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499671268] [2022-12-14 08:57:50,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:57:50,852 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:57:51,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:59,423 INFO L134 CoverageAnalysis]: Checked inductivity of 14630 backedges. 9593 proven. 5037 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:57:59,423 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:57:59,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499671268] [2022-12-14 08:57:59,423 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499671268] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:57:59,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [872788741] [2022-12-14 08:57:59,424 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 08:57:59,424 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:57:59,424 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:57:59,425 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:57:59,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2022-12-14 08:57:59,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:57:59,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 1577 conjuncts, 142 conjunts are in the unsatisfiable core [2022-12-14 08:57:59,624 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:58:05,022 INFO L134 CoverageAnalysis]: Checked inductivity of 14630 backedges. 9798 proven. 4830 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:58:05,022 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:58:09,215 INFO L134 CoverageAnalysis]: Checked inductivity of 14630 backedges. 9798 proven. 4830 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 08:58:09,215 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [872788741] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:58:09,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1114820535] [2022-12-14 08:58:09,216 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:58:09,216 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:58:09,216 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:58:09,216 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:58:09,216 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:58:09,291 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:58:10,196 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '247592#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:58:10,196 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:58:10,196 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:58:10,196 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [143, 142, 142] total 215 [2022-12-14 08:58:10,197 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037982281] [2022-12-14 08:58:10,197 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:58:10,197 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 215 states [2022-12-14 08:58:10,197 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:58:10,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 215 interpolants. [2022-12-14 08:58:10,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10467, Invalid=39485, Unknown=0, NotChecked=0, Total=49952 [2022-12-14 08:58:10,200 INFO L87 Difference]: Start difference. First operand 429 states and 431 transitions. Second operand has 215 states, 215 states have (on average 3.3302325581395347) internal successors, (716), 215 states have internal predecessors, (716), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:16,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:58:16,057 INFO L93 Difference]: Finished difference Result 926 states and 999 transitions. [2022-12-14 08:58:16,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2022-12-14 08:58:16,057 INFO L78 Accepts]: Start accepts. Automaton has has 215 states, 215 states have (on average 3.3302325581395347) internal successors, (716), 215 states have internal predecessors, (716), 0 states have call successors, (0), 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 428 [2022-12-14 08:58:16,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:58:16,058 INFO L225 Difference]: With dead ends: 926 [2022-12-14 08:58:16,058 INFO L226 Difference]: Without dead ends: 641 [2022-12-14 08:58:16,063 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1495 GetRequests, 1065 SyntacticMatches, 138 SemanticMatches, 292 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32833 ImplicationChecksByTransitivity, 15.5s TimeCoverageRelationStatistics Valid=20409, Invalid=65733, Unknown=0, NotChecked=0, Total=86142 [2022-12-14 08:58:16,063 INFO L413 NwaCegarLoop]: 142 mSDtfsCounter, 754 mSDsluCounter, 1719 mSDsCounter, 0 mSdLazyCounter, 1926 mSolverCounterSat, 342 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 754 SdHoareTripleChecker+Valid, 1861 SdHoareTripleChecker+Invalid, 2268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 342 IncrementalHoareTripleChecker+Valid, 1926 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-12-14 08:58:16,063 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [754 Valid, 1861 Invalid, 2268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [342 Valid, 1926 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-12-14 08:58:16,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 641 states. [2022-12-14 08:58:16,162 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 641 to 431. [2022-12-14 08:58:16,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 431 states, 430 states have (on average 1.0069767441860464) internal successors, (433), 430 states have internal predecessors, (433), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:16,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 433 transitions. [2022-12-14 08:58:16,163 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 433 transitions. Word has length 428 [2022-12-14 08:58:16,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:58:16,163 INFO L495 AbstractCegarLoop]: Abstraction has 431 states and 433 transitions. [2022-12-14 08:58:16,163 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 215 states, 215 states have (on average 3.3302325581395347) internal successors, (716), 215 states have internal predecessors, (716), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:16,163 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 433 transitions. [2022-12-14 08:58:16,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 431 [2022-12-14 08:58:16,164 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:58:16,165 INFO L195 NwaCegarLoop]: trace histogram [71, 71, 70, 70, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:58:16,170 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Ended with exit code 0 [2022-12-14 08:58:16,365 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable105,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:58:16,366 INFO L420 AbstractCegarLoop]: === Iteration 107 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:58:16,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:58:16,367 INFO L85 PathProgramCache]: Analyzing trace with hash -1531937344, now seen corresponding path program 104 times [2022-12-14 08:58:16,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:58:16,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1038459018] [2022-12-14 08:58:16,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:58:16,368 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 08:58:16,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 08:58:24,073 INFO L134 CoverageAnalysis]: Checked inductivity of 14770 backedges. 9593 proven. 5177 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:24,074 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 08:58:24,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1038459018] [2022-12-14 08:58:24,074 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1038459018] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 08:58:24,074 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1496677499] [2022-12-14 08:58:24,074 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 08:58:24,074 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 08:58:24,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 08:58:24,075 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 08:58:24,075 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Waiting until timeout for monitored process [2022-12-14 08:58:24,517 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 71 check-sat command(s) [2022-12-14 08:58:24,517 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 08:58:24,526 INFO L263 TraceCheckSpWp]: Trace formula consists of 1587 conjuncts, 144 conjunts are in the unsatisfiable core [2022-12-14 08:58:24,530 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 08:58:29,667 INFO L134 CoverageAnalysis]: Checked inductivity of 14770 backedges. 9800 proven. 4970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:29,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 08:58:33,740 INFO L134 CoverageAnalysis]: Checked inductivity of 14770 backedges. 9800 proven. 4970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-12-14 08:58:33,740 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1496677499] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 08:58:33,740 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [145599086] [2022-12-14 08:58:33,741 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2022-12-14 08:58:33,741 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 08:58:33,741 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 08:58:33,741 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 08:58:33,741 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 08:58:33,817 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 08:58:34,760 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '252526#(and (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (<= 0 |ULTIMATE.start_main_~k~0#1|) 1 0)) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~pvlen~0#1|) (<= 0 |ULTIMATE.start_main_~n~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~pvlen~0#1| 2147483647) (= |#NULL.base| 0))' at error location [2022-12-14 08:58:34,760 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 08:58:34,760 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 08:58:34,761 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [144, 144, 144] total 217 [2022-12-14 08:58:34,761 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651186202] [2022-12-14 08:58:34,761 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 08:58:34,761 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 217 states [2022-12-14 08:58:34,761 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 08:58:34,763 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 217 interpolants. [2022-12-14 08:58:34,765 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10685, Invalid=40165, Unknown=0, NotChecked=0, Total=50850 [2022-12-14 08:58:34,765 INFO L87 Difference]: Start difference. First operand 431 states and 433 transitions. Second operand has 217 states, 217 states have (on average 3.3087557603686637) internal successors, (718), 217 states have internal predecessors, (718), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:41,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 08:58:41,531 INFO L93 Difference]: Finished difference Result 933 states and 1007 transitions. [2022-12-14 08:58:41,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2022-12-14 08:58:41,531 INFO L78 Accepts]: Start accepts. Automaton has has 217 states, 217 states have (on average 3.3087557603686637) internal successors, (718), 217 states have internal predecessors, (718), 0 states have call successors, (0), 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 430 [2022-12-14 08:58:41,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 08:58:41,532 INFO L225 Difference]: With dead ends: 933 [2022-12-14 08:58:41,532 INFO L226 Difference]: Without dead ends: 646 [2022-12-14 08:58:41,536 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1503 GetRequests, 1068 SyntacticMatches, 140 SemanticMatches, 295 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33436 ImplicationChecksByTransitivity, 15.0s TimeCoverageRelationStatistics Valid=20911, Invalid=67001, Unknown=0, NotChecked=0, Total=87912 [2022-12-14 08:58:41,536 INFO L413 NwaCegarLoop]: 144 mSDtfsCounter, 763 mSDsluCounter, 1779 mSDsCounter, 0 mSdLazyCounter, 2010 mSolverCounterSat, 347 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 763 SdHoareTripleChecker+Valid, 1923 SdHoareTripleChecker+Invalid, 2357 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 347 IncrementalHoareTripleChecker+Valid, 2010 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 08:58:41,536 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [763 Valid, 1923 Invalid, 2357 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [347 Valid, 2010 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 08:58:41,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 646 states. [2022-12-14 08:58:41,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 646 to 433. [2022-12-14 08:58:41,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 432 states have (on average 1.0069444444444444) internal successors, (435), 432 states have internal predecessors, (435), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:41,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 435 transitions. [2022-12-14 08:58:41,630 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 435 transitions. Word has length 430 [2022-12-14 08:58:41,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 08:58:41,630 INFO L495 AbstractCegarLoop]: Abstraction has 433 states and 435 transitions. [2022-12-14 08:58:41,630 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 217 states, 217 states have (on average 3.3087557603686637) internal successors, (718), 217 states have internal predecessors, (718), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 08:58:41,631 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 435 transitions. [2022-12-14 08:58:41,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 433 [2022-12-14 08:58:41,632 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 08:58:41,632 INFO L195 NwaCegarLoop]: trace histogram [72, 71, 71, 70, 70, 70, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 08:58:41,638 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Forceful destruction successful, exit code 0 [2022-12-14 08:58:41,832 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_377048ca-e1ba-433d-b850-a9c5dae248b2/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable106 [2022-12-14 08:58:41,833 INFO L420 AbstractCegarLoop]: === Iteration 108 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 08:58:41,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 08:58:41,834 INFO L85 PathProgramCache]: Analyzing trace with hash 846584421, now seen corresponding path program 105 times [2022-12-14 08:58:41,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 08:58:41,834 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [86287555] [2022-12-14 08:58:41,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 08:58:41,835 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms