./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/theatreSquare.c --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_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/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_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/theatreSquare.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/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_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/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 90f363148c6ea94b18bb0ae0702d2476b109719554576ef0704192e7e62145c3 --- 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 15:00:47,417 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-12-14 15:00:47,418 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-12-14 15:00:47,435 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-12-14 15:00:47,436 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-12-14 15:00:47,437 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-12-14 15:00:47,438 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-12-14 15:00:47,439 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-12-14 15:00:47,441 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-12-14 15:00:47,441 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-12-14 15:00:47,442 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-12-14 15:00:47,443 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-12-14 15:00:47,443 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-12-14 15:00:47,444 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-12-14 15:00:47,445 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-12-14 15:00:47,446 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-12-14 15:00:47,447 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-12-14 15:00:47,448 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-12-14 15:00:47,449 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-12-14 15:00:47,451 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-12-14 15:00:47,452 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-12-14 15:00:47,453 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-12-14 15:00:47,459 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-12-14 15:00:47,460 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-12-14 15:00:47,462 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-12-14 15:00:47,463 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-12-14 15:00:47,463 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-12-14 15:00:47,463 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-12-14 15:00:47,464 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-12-14 15:00:47,464 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-12-14 15:00:47,464 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-12-14 15:00:47,465 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-12-14 15:00:47,465 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-12-14 15:00:47,466 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-12-14 15:00:47,467 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-12-14 15:00:47,467 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-12-14 15:00:47,467 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-12-14 15:00:47,467 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-12-14 15:00:47,468 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-12-14 15:00:47,468 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-12-14 15:00:47,469 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-12-14 15:00:47,469 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-12-14 15:00:47,499 INFO L113 SettingsManager]: Loading preferences was successful [2022-12-14 15:00:47,500 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-12-14 15:00:47,500 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-12-14 15:00:47,500 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-12-14 15:00:47,501 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-12-14 15:00:47,501 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-12-14 15:00:47,501 INFO L138 SettingsManager]: * User list type=DISABLED [2022-12-14 15:00:47,501 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-12-14 15:00:47,501 INFO L138 SettingsManager]: * Explicit value domain=true [2022-12-14 15:00:47,501 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-12-14 15:00:47,501 INFO L138 SettingsManager]: * Octagon Domain=false [2022-12-14 15:00:47,501 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-12-14 15:00:47,501 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-12-14 15:00:47,502 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-12-14 15:00:47,502 INFO L138 SettingsManager]: * Interval Domain=false [2022-12-14 15:00:47,502 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-12-14 15:00:47,502 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-12-14 15:00:47,502 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-12-14 15:00:47,503 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-12-14 15:00:47,503 INFO L138 SettingsManager]: * sizeof long=4 [2022-12-14 15:00:47,503 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-12-14 15:00:47,503 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-12-14 15:00:47,503 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-12-14 15:00:47,503 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-12-14 15:00:47,503 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-12-14 15:00:47,504 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-12-14 15:00:47,504 INFO L138 SettingsManager]: * sizeof long double=12 [2022-12-14 15:00:47,504 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-12-14 15:00:47,504 INFO L138 SettingsManager]: * Use constant arrays=true [2022-12-14 15:00:47,504 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-12-14 15:00:47,504 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-12-14 15:00:47,504 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-12-14 15:00:47,504 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 15:00:47,505 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-12-14 15:00:47,505 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-12-14 15:00:47,505 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-12-14 15:00:47,505 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-12-14 15:00:47,505 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-12-14 15:00:47,505 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-12-14 15:00:47,505 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-12-14 15:00:47,505 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-12-14 15:00:47,505 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_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 90f363148c6ea94b18bb0ae0702d2476b109719554576ef0704192e7e62145c3 [2022-12-14 15:00:47,688 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-12-14 15:00:47,704 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-12-14 15:00:47,706 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-12-14 15:00:47,706 INFO L271 PluginConnector]: Initializing CDTParser... [2022-12-14 15:00:47,707 INFO L275 PluginConnector]: CDTParser initialized [2022-12-14 15:00:47,708 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/../../sv-benchmarks/c/loops-crafted-1/theatreSquare.c [2022-12-14 15:00:50,355 INFO L500 CDTParser]: Created temporary CDT project at NULL [2022-12-14 15:00:50,497 INFO L351 CDTParser]: Found 1 translation units. [2022-12-14 15:00:50,498 INFO L172 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/sv-benchmarks/c/loops-crafted-1/theatreSquare.c [2022-12-14 15:00:50,502 INFO L394 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/data/07801b47f/24a96a0267ba41e48dbcd52216e22248/FLAG7777756cf [2022-12-14 15:00:50,516 INFO L402 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/data/07801b47f/24a96a0267ba41e48dbcd52216e22248 [2022-12-14 15:00:50,517 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-12-14 15:00:50,518 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-12-14 15:00:50,519 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-12-14 15:00:50,519 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-12-14 15:00:50,522 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-12-14 15:00:50,523 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 03:00:50" (1/1) ... [2022-12-14 15:00:50,523 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@630aec7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:00:50, skipping insertion in model container [2022-12-14 15:00:50,524 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.12 03:00:50" (1/1) ... [2022-12-14 15:00:50,529 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-12-14 15:00:50,545 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-12-14 15:00:50,687 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_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/sv-benchmarks/c/loops-crafted-1/theatreSquare.c[370,383] [2022-12-14 15:00:50,706 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 15:00:50,715 INFO L203 MainTranslator]: Completed pre-run [2022-12-14 15:00:50,727 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_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/sv-benchmarks/c/loops-crafted-1/theatreSquare.c[370,383] [2022-12-14 15:00:50,735 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-12-14 15:00:50,748 INFO L208 MainTranslator]: Completed translation [2022-12-14 15:00:50,748 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:00:50 WrapperNode [2022-12-14 15:00:50,749 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-12-14 15:00:50,749 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-12-14 15:00:50,750 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-12-14 15:00:50,750 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-12-14 15:00:50,756 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:00:50" (1/1) ... [2022-12-14 15:00:50,762 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:00:50" (1/1) ... [2022-12-14 15:00:50,781 INFO L138 Inliner]: procedures = 15, calls = 10, calls flagged for inlining = 5, calls inlined = 5, statements flattened = 100 [2022-12-14 15:00:50,782 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-12-14 15:00:50,782 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-12-14 15:00:50,783 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-12-14 15:00:50,783 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-12-14 15:00:50,791 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:00:50" (1/1) ... [2022-12-14 15:00:50,791 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:00:50" (1/1) ... [2022-12-14 15:00:50,792 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:00:50" (1/1) ... [2022-12-14 15:00:50,792 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:00:50" (1/1) ... [2022-12-14 15:00:50,794 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:00:50" (1/1) ... [2022-12-14 15:00:50,798 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:00:50" (1/1) ... [2022-12-14 15:00:50,798 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:00:50" (1/1) ... [2022-12-14 15:00:50,799 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:00:50" (1/1) ... [2022-12-14 15:00:50,800 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-12-14 15:00:50,801 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-12-14 15:00:50,801 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-12-14 15:00:50,801 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-12-14 15:00:50,802 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:00:50" (1/1) ... [2022-12-14 15:00:50,807 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-12-14 15:00:50,816 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:00:50,827 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-12-14 15:00:50,829 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-12-14 15:00:50,863 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-12-14 15:00:50,863 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-12-14 15:00:50,863 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-12-14 15:00:50,863 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-12-14 15:00:50,924 INFO L235 CfgBuilder]: Building ICFG [2022-12-14 15:00:50,925 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-12-14 15:00:51,042 INFO L276 CfgBuilder]: Performing block encoding [2022-12-14 15:00:51,071 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-12-14 15:00:51,071 INFO L300 CfgBuilder]: Removed 6 assume(true) statements. [2022-12-14 15:00:51,073 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 03:00:51 BoogieIcfgContainer [2022-12-14 15:00:51,073 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-12-14 15:00:51,075 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-12-14 15:00:51,075 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-12-14 15:00:51,078 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-12-14 15:00:51,078 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.12 03:00:50" (1/3) ... [2022-12-14 15:00:51,078 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@412915c2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 03:00:51, skipping insertion in model container [2022-12-14 15:00:51,078 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.12 03:00:50" (2/3) ... [2022-12-14 15:00:51,079 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@412915c2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.12 03:00:51, skipping insertion in model container [2022-12-14 15:00:51,079 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.12 03:00:51" (3/3) ... [2022-12-14 15:00:51,080 INFO L112 eAbstractionObserver]: Analyzing ICFG theatreSquare.c [2022-12-14 15:00:51,101 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-12-14 15:00:51,101 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-12-14 15:00:51,138 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-12-14 15:00:51,143 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;@de289, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-12-14 15:00:51,143 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-12-14 15:00:51,148 INFO L276 IsEmpty]: Start isEmpty. Operand has 14 states, 12 states have (on average 1.75) internal successors, (21), 13 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 15:00:51,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2022-12-14 15:00:51,154 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:00:51,155 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2022-12-14 15:00:51,155 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:00:51,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:00:51,161 INFO L85 PathProgramCache]: Analyzing trace with hash 128217580, now seen corresponding path program 1 times [2022-12-14 15:00:51,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:00:51,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801082397] [2022-12-14 15:00:51,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:00:51,174 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:00:51,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:00:51,383 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 15:00:51,383 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:00:51,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801082397] [2022-12-14 15:00:51,384 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1801082397] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:00:51,384 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:00:51,385 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 15:00:51,386 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15450030] [2022-12-14 15:00:51,387 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:00:51,390 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 15:00:51,391 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:00:51,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 15:00:51,413 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 15:00:51,414 INFO L87 Difference]: Start difference. First operand has 14 states, 12 states have (on average 1.75) internal successors, (21), 13 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 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:51,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:00:51,465 INFO L93 Difference]: Finished difference Result 22 states and 28 transitions. [2022-12-14 15:00:51,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 15:00:51,467 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2022-12-14 15:00:51,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:00:51,473 INFO L225 Difference]: With dead ends: 22 [2022-12-14 15:00:51,473 INFO L226 Difference]: Without dead ends: 12 [2022-12-14 15:00:51,475 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 15:00:51,477 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 12 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:00:51,478 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 25 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:00:51,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2022-12-14 15:00:51,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2022-12-14 15:00:51,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 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 15:00:51,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 17 transitions. [2022-12-14 15:00:51,500 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 17 transitions. Word has length 5 [2022-12-14 15:00:51,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:00:51,501 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 17 transitions. [2022-12-14 15:00:51,501 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:51,501 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 17 transitions. [2022-12-14 15:00:51,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2022-12-14 15:00:51,501 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:00:51,502 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:00:51,502 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-12-14 15:00:51,502 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:00:51,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:00:51,503 INFO L85 PathProgramCache]: Analyzing trace with hash -854704195, now seen corresponding path program 1 times [2022-12-14 15:00:51,503 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:00:51,503 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1795936135] [2022-12-14 15:00:51,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:00:51,503 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:00:51,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:00:51,589 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 15:00:51,589 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:00:51,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1795936135] [2022-12-14 15:00:51,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1795936135] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:00:51,590 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:00:51,590 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 15:00:51,590 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274110073] [2022-12-14 15:00:51,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:00:51,591 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 15:00:51,592 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:00:51,592 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 15:00:51,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 15:00:51,593 INFO L87 Difference]: Start difference. First operand 12 states and 17 transitions. Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:51,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:00:51,613 INFO L93 Difference]: Finished difference Result 21 states and 30 transitions. [2022-12-14 15:00:51,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 15:00:51,614 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2022-12-14 15:00:51,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:00:51,614 INFO L225 Difference]: With dead ends: 21 [2022-12-14 15:00:51,614 INFO L226 Difference]: Without dead ends: 13 [2022-12-14 15:00:51,615 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 15:00:51,616 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 1 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:00:51,617 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 16 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:00:51,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2022-12-14 15:00:51,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2022-12-14 15:00:51,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.5) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:51,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 18 transitions. [2022-12-14 15:00:51,622 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 18 transitions. Word has length 11 [2022-12-14 15:00:51,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:00:51,623 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 18 transitions. [2022-12-14 15:00:51,623 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:51,623 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 18 transitions. [2022-12-14 15:00:51,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2022-12-14 15:00:51,624 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:00:51,624 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:00:51,624 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-12-14 15:00:51,624 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:00:51,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:00:51,625 INFO L85 PathProgramCache]: Analyzing trace with hash -370460536, now seen corresponding path program 1 times [2022-12-14 15:00:51,625 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:00:51,626 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [447169409] [2022-12-14 15:00:51,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:00:51,626 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:00:51,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:00:51,727 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 15:00:51,728 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:00:51,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [447169409] [2022-12-14 15:00:51,728 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [447169409] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:00:51,728 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:00:51,728 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2022-12-14 15:00:51,729 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222225890] [2022-12-14 15:00:51,729 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:00:51,729 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2022-12-14 15:00:51,729 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:00:51,730 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2022-12-14 15:00:51,730 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 15:00:51,730 INFO L87 Difference]: Start difference. First operand 13 states and 18 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:51,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:00:51,752 INFO L93 Difference]: Finished difference Result 24 states and 34 transitions. [2022-12-14 15:00:51,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2022-12-14 15:00:51,753 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2022-12-14 15:00:51,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:00:51,753 INFO L225 Difference]: With dead ends: 24 [2022-12-14 15:00:51,754 INFO L226 Difference]: Without dead ends: 14 [2022-12-14 15:00:51,754 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2022-12-14 15:00:51,755 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:00:51,756 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 17 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:00:51,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2022-12-14 15:00:51,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2022-12-14 15:00:51,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 13 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 15:00:51,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 19 transitions. [2022-12-14 15:00:51,760 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 19 transitions. Word has length 12 [2022-12-14 15:00:51,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:00:51,761 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 19 transitions. [2022-12-14 15:00:51,761 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:51,761 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 19 transitions. [2022-12-14 15:00:51,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2022-12-14 15:00:51,762 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:00:51,762 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:00:51,762 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2022-12-14 15:00:51,762 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:00:51,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:00:51,763 INFO L85 PathProgramCache]: Analyzing trace with hash -341223876, now seen corresponding path program 1 times [2022-12-14 15:00:51,763 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:00:51,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1112639652] [2022-12-14 15:00:51,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:00:51,764 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:00:51,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:00:51,849 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 15:00:51,849 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:00:51,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1112639652] [2022-12-14 15:00:51,849 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1112639652] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:00:51,849 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1576780865] [2022-12-14 15:00:51,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:00:51,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:00:51,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:00:51,851 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:00:51,852 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-12-14 15:00:51,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:00:51,910 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 15:00:51,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:00:51,960 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-12-14 15:00:51,961 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 15:00:51,961 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1576780865] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:00:51,961 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 15:00:51,961 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 7 [2022-12-14 15:00:51,961 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838820168] [2022-12-14 15:00:51,962 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:00:51,962 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 15:00:51,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:00:51,963 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 15:00:51,963 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-12-14 15:00:51,963 INFO L87 Difference]: Start difference. First operand 14 states and 19 transitions. Second operand has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:51,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:00:51,987 INFO L93 Difference]: Finished difference Result 22 states and 30 transitions. [2022-12-14 15:00:51,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 15:00:51,988 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2022-12-14 15:00:51,988 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:00:51,988 INFO L225 Difference]: With dead ends: 22 [2022-12-14 15:00:51,988 INFO L226 Difference]: Without dead ends: 15 [2022-12-14 15:00:51,989 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-12-14 15:00:51,989 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 24 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:00:51,989 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 15 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:00:51,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2022-12-14 15:00:51,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2022-12-14 15:00:51,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 14 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:51,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 20 transitions. [2022-12-14 15:00:51,993 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 20 transitions. Word has length 13 [2022-12-14 15:00:51,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:00:51,993 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 20 transitions. [2022-12-14 15:00:51,993 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:51,993 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 20 transitions. [2022-12-14 15:00:51,993 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2022-12-14 15:00:51,993 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:00:51,993 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:00:51,999 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-12-14 15:00:52,194 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:00:52,195 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:00:52,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:00:52,197 INFO L85 PathProgramCache]: Analyzing trace with hash -2146993872, now seen corresponding path program 1 times [2022-12-14 15:00:52,198 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:00:52,198 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629046170] [2022-12-14 15:00:52,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:00:52,199 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:00:52,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:00:52,312 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 15:00:52,312 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:00:52,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629046170] [2022-12-14 15:00:52,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1629046170] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:00:52,313 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-12-14 15:00:52,313 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2022-12-14 15:00:52,313 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731164887] [2022-12-14 15:00:52,313 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:00:52,314 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 15:00:52,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:00:52,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 15:00:52,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2022-12-14 15:00:52,315 INFO L87 Difference]: Start difference. First operand 15 states and 20 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 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 15:00:52,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:00:52,340 INFO L93 Difference]: Finished difference Result 22 states and 29 transitions. [2022-12-14 15:00:52,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 15:00:52,341 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 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 15:00:52,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:00:52,341 INFO L225 Difference]: With dead ends: 22 [2022-12-14 15:00:52,341 INFO L226 Difference]: Without dead ends: 16 [2022-12-14 15:00:52,341 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2022-12-14 15:00:52,342 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 11 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:00:52,343 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 18 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:00:52,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2022-12-14 15:00:52,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2022-12-14 15:00:52,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.4) internal successors, (21), 15 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 15:00:52,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 21 transitions. [2022-12-14 15:00:52,347 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 21 transitions. Word has length 14 [2022-12-14 15:00:52,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:00:52,347 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 21 transitions. [2022-12-14 15:00:52,348 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 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 15:00:52,348 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 21 transitions. [2022-12-14 15:00:52,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2022-12-14 15:00:52,348 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:00:52,348 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:00:52,348 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2022-12-14 15:00:52,349 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:00:52,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:00:52,349 INFO L85 PathProgramCache]: Analyzing trace with hash -2121711937, now seen corresponding path program 1 times [2022-12-14 15:00:52,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:00:52,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2087772575] [2022-12-14 15:00:52,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:00:52,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:00:52,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:00:52,413 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2022-12-14 15:00:52,413 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:00:52,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2087772575] [2022-12-14 15:00:52,414 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2087772575] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:00:52,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1845514622] [2022-12-14 15:00:52,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:00:52,414 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:00:52,414 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:00:52,415 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:00:52,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-12-14 15:00:52,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:00:52,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 5 conjunts are in the unsatisfiable core [2022-12-14 15:00:52,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:00:52,498 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:00:52,499 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 15:00:52,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1845514622] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:00:52,499 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 15:00:52,499 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [5] total 7 [2022-12-14 15:00:52,499 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287794327] [2022-12-14 15:00:52,499 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:00:52,500 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2022-12-14 15:00:52,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:00:52,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2022-12-14 15:00:52,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2022-12-14 15:00:52,501 INFO L87 Difference]: Start difference. First operand 16 states and 21 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:52,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:00:52,524 INFO L93 Difference]: Finished difference Result 22 states and 28 transitions. [2022-12-14 15:00:52,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2022-12-14 15:00:52,524 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2022-12-14 15:00:52,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:00:52,524 INFO L225 Difference]: With dead ends: 22 [2022-12-14 15:00:52,525 INFO L226 Difference]: Without dead ends: 17 [2022-12-14 15:00:52,525 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2022-12-14 15:00:52,526 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 11 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:00:52,526 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 17 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:00:52,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2022-12-14 15:00:52,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2022-12-14 15:00:52,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.375) internal successors, (22), 16 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:52,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 22 transitions. [2022-12-14 15:00:52,531 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 22 transitions. Word has length 15 [2022-12-14 15:00:52,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:00:52,531 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 22 transitions. [2022-12-14 15:00:52,531 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:52,531 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 22 transitions. [2022-12-14 15:00:52,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2022-12-14 15:00:52,532 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:00:52,532 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:00:52,536 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-12-14 15:00:52,732 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:00:52,733 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:00:52,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:00:52,733 INFO L85 PathProgramCache]: Analyzing trace with hash 1547031193, now seen corresponding path program 1 times [2022-12-14 15:00:52,733 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:00:52,733 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [38035317] [2022-12-14 15:00:52,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:00:52,733 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:00:52,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:00:52,812 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:00:52,813 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:00:52,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [38035317] [2022-12-14 15:00:52,813 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [38035317] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:00:52,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1007926034] [2022-12-14 15:00:52,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:00:52,813 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:00:52,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:00:52,815 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:00:52,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-12-14 15:00:52,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:00:52,862 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 4 conjunts are in the unsatisfiable core [2022-12-14 15:00:52,863 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:00:52,885 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:00:52,885 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2022-12-14 15:00:52,886 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1007926034] provided 1 perfect and 0 imperfect interpolant sequences [2022-12-14 15:00:52,886 INFO L184 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2022-12-14 15:00:52,886 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 7 [2022-12-14 15:00:52,886 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163024379] [2022-12-14 15:00:52,886 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-12-14 15:00:52,886 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-12-14 15:00:52,887 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:00:52,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-12-14 15:00:52,887 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-12-14 15:00:52,888 INFO L87 Difference]: Start difference. First operand 17 states and 22 transitions. Second operand has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:52,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:00:52,908 INFO L93 Difference]: Finished difference Result 22 states and 27 transitions. [2022-12-14 15:00:52,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-12-14 15:00:52,908 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2022-12-14 15:00:52,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:00:52,909 INFO L225 Difference]: With dead ends: 22 [2022-12-14 15:00:52,909 INFO L226 Difference]: Without dead ends: 18 [2022-12-14 15:00:52,909 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2022-12-14 15:00:52,910 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 12 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 23 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:00:52,910 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 20 Invalid, 23 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:00:52,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2022-12-14 15:00:52,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2022-12-14 15:00:52,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 17 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:52,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 23 transitions. [2022-12-14 15:00:52,915 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 23 transitions. Word has length 16 [2022-12-14 15:00:52,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:00:52,915 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 23 transitions. [2022-12-14 15:00:52,915 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.2) internal successors, (16), 5 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:52,915 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 23 transitions. [2022-12-14 15:00:52,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2022-12-14 15:00:52,916 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:00:52,916 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:00:52,921 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-12-14 15:00:53,116 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:00:53,118 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:00:53,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:00:53,120 INFO L85 PathProgramCache]: Analyzing trace with hash 683532874, now seen corresponding path program 1 times [2022-12-14 15:00:53,120 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:00:53,120 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914299876] [2022-12-14 15:00:53,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:00:53,121 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:00:53,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:00:53,471 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:00:53,472 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:00:53,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914299876] [2022-12-14 15:00:53,472 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [914299876] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:00:53,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1209590349] [2022-12-14 15:00:53,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:00:53,472 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:00:53,472 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:00:53,473 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:00:53,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-12-14 15:00:53,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:00:53,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 15:00:53,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:00:53,603 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:00:53,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:00:53,703 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:00:53,704 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1209590349] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:00:53,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1238893941] [2022-12-14 15:00:53,723 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:00:53,723 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:00:53,726 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:00:53,731 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:00:53,732 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:00:54,390 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:00:56,205 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '701#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:00:56,205 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:00:56,206 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:00:56,206 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2022-12-14 15:00:56,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971054500] [2022-12-14 15:00:56,206 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:00:56,206 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 15:00:56,206 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:00:56,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 15:00:56,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=722, Unknown=0, NotChecked=0, Total=812 [2022-12-14 15:00:56,207 INFO L87 Difference]: Start difference. First operand 18 states and 23 transitions. Second operand has 19 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 19 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:56,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:00:56,506 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2022-12-14 15:00:56,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-12-14 15:00:56,506 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 19 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2022-12-14 15:00:56,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:00:56,507 INFO L225 Difference]: With dead ends: 54 [2022-12-14 15:00:56,507 INFO L226 Difference]: Without dead ends: 50 [2022-12-14 15:00:56,508 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 28 SyntacticMatches, 6 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=183, Invalid=1377, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 15:00:56,509 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 61 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 118 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:00:56,509 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 118 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:00:56,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2022-12-14 15:00:56,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 26. [2022-12-14 15:00:56,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.4) internal successors, (35), 25 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 15:00:56,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 35 transitions. [2022-12-14 15:00:56,514 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 35 transitions. Word has length 17 [2022-12-14 15:00:56,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:00:56,514 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 35 transitions. [2022-12-14 15:00:56,515 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 19 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:56,515 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 35 transitions. [2022-12-14 15:00:56,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-12-14 15:00:56,515 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:00:56,515 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:00:56,519 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2022-12-14 15:00:56,716 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2022-12-14 15:00:56,717 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:00:56,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:00:56,718 INFO L85 PathProgramCache]: Analyzing trace with hash 1252617022, now seen corresponding path program 2 times [2022-12-14 15:00:56,718 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:00:56,719 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [728429427] [2022-12-14 15:00:56,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:00:56,719 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:00:56,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:00:56,808 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:00:56,809 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:00:56,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [728429427] [2022-12-14 15:00:56,809 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [728429427] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:00:56,809 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [560339310] [2022-12-14 15:00:56,809 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:00:56,809 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:00:56,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:00:56,810 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:00:56,811 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-12-14 15:00:56,849 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 15:00:56,849 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:00:56,850 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 5 conjunts are in the unsatisfiable core [2022-12-14 15:00:56,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:00:56,879 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:00:56,879 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:00:56,901 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:00:56,901 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [560339310] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:00:56,901 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1705396190] [2022-12-14 15:00:56,904 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:00:56,904 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:00:56,904 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:00:56,904 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:00:56,904 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:00:57,351 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:00:58,961 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '977#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:00:58,961 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:00:58,961 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:00:58,961 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2022-12-14 15:00:58,961 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704495824] [2022-12-14 15:00:58,961 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:00:58,962 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 15:00:58,962 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:00:58,962 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 15:00:58,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2022-12-14 15:00:58,963 INFO L87 Difference]: Start difference. First operand 26 states and 35 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 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 15:00:58,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:00:58,998 INFO L93 Difference]: Finished difference Result 60 states and 81 transitions. [2022-12-14 15:00:58,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 15:00:58,999 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 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) Word has length 18 [2022-12-14 15:00:58,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:00:58,999 INFO L225 Difference]: With dead ends: 60 [2022-12-14 15:00:58,999 INFO L226 Difference]: Without dead ends: 49 [2022-12-14 15:00:58,999 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 112 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=73, Invalid=307, Unknown=0, NotChecked=0, Total=380 [2022-12-14 15:00:59,000 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 48 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:00:59,000 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 43 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:00:59,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2022-12-14 15:00:59,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 34. [2022-12-14 15:00:59,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.393939393939394) internal successors, (46), 33 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:00:59,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 46 transitions. [2022-12-14 15:00:59,005 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 46 transitions. Word has length 18 [2022-12-14 15:00:59,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:00:59,005 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 46 transitions. [2022-12-14 15:00:59,005 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 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 15:00:59,005 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 46 transitions. [2022-12-14 15:00:59,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-12-14 15:00:59,006 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:00:59,006 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:00:59,010 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2022-12-14 15:00:59,206 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:00:59,207 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:00:59,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:00:59,208 INFO L85 PathProgramCache]: Analyzing trace with hash 177530788, now seen corresponding path program 3 times [2022-12-14 15:00:59,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:00:59,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1968236144] [2022-12-14 15:00:59,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:00:59,209 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:00:59,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:00:59,318 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:00:59,318 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:00:59,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1968236144] [2022-12-14 15:00:59,318 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1968236144] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:00:59,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012694042] [2022-12-14 15:00:59,318 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:00:59,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:00:59,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:00:59,319 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:00:59,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-12-14 15:00:59,364 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:00:59,364 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:00:59,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 15:00:59,367 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:00:59,431 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:00:59,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:00:59,499 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:00:59,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1012694042] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:00:59,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1436671682] [2022-12-14 15:00:59,500 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:00:59,500 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:00:59,500 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:00:59,500 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:00:59,501 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:00:59,882 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:01,525 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1270#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:01,525 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:01,525 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:01,525 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2022-12-14 15:01:01,525 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425112259] [2022-12-14 15:01:01,525 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:01,526 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 15:01:01,526 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:01,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 15:01:01,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2022-12-14 15:01:01,526 INFO L87 Difference]: Start difference. First operand 34 states and 46 transitions. Second operand has 13 states, 13 states have (on average 2.769230769230769) internal successors, (36), 13 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 15:01:01,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:01,631 INFO L93 Difference]: Finished difference Result 52 states and 68 transitions. [2022-12-14 15:01:01,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 15:01:01,631 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.769230769230769) internal successors, (36), 13 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 18 [2022-12-14 15:01:01,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:01,632 INFO L225 Difference]: With dead ends: 52 [2022-12-14 15:01:01,632 INFO L226 Difference]: Without dead ends: 45 [2022-12-14 15:01:01,632 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=115, Invalid=587, Unknown=0, NotChecked=0, Total=702 [2022-12-14 15:01:01,633 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 51 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:01,633 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 57 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:01:01,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2022-12-14 15:01:01,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 39. [2022-12-14 15:01:01,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 38 states have (on average 1.368421052631579) internal successors, (52), 38 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:01,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 52 transitions. [2022-12-14 15:01:01,642 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 52 transitions. Word has length 18 [2022-12-14 15:01:01,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:01,642 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 52 transitions. [2022-12-14 15:01:01,643 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.769230769230769) internal successors, (36), 13 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 15:01:01,643 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 52 transitions. [2022-12-14 15:01:01,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-12-14 15:01:01,643 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:01,643 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:01,647 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2022-12-14 15:01:01,844 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:01,845 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:01,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:01,846 INFO L85 PathProgramCache]: Analyzing trace with hash -315111239, now seen corresponding path program 4 times [2022-12-14 15:01:01,847 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:01,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [712542496] [2022-12-14 15:01:01,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:01,848 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:01,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:01,930 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:01,930 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:01,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [712542496] [2022-12-14 15:01:01,930 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [712542496] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:01,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1742048960] [2022-12-14 15:01:01,931 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:01:01,931 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:01,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:01,932 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:01,932 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-12-14 15:01:01,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:01,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 5 conjunts are in the unsatisfiable core [2022-12-14 15:01:01,973 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:01,999 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:01,999 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:02,019 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:02,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1742048960] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:02,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1862103472] [2022-12-14 15:01:02,021 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:02,022 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:02,022 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:02,022 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:02,022 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:02,429 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:03,700 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1562#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:03,700 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:03,700 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:03,700 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 10 [2022-12-14 15:01:03,700 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562866837] [2022-12-14 15:01:03,700 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:03,700 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-12-14 15:01:03,700 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:03,701 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-12-14 15:01:03,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2022-12-14 15:01:03,701 INFO L87 Difference]: Start difference. First operand 39 states and 52 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 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 15:01:03,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:03,726 INFO L93 Difference]: Finished difference Result 61 states and 78 transitions. [2022-12-14 15:01:03,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 15:01:03,727 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 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) Word has length 18 [2022-12-14 15:01:03,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:03,727 INFO L225 Difference]: With dead ends: 61 [2022-12-14 15:01:03,727 INFO L226 Difference]: Without dead ends: 52 [2022-12-14 15:01:03,727 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2022-12-14 15:01:03,728 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 11 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:03,728 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 40 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:01:03,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2022-12-14 15:01:03,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 48. [2022-12-14 15:01:03,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 47 states have (on average 1.3617021276595744) internal successors, (64), 47 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:03,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 64 transitions. [2022-12-14 15:01:03,738 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 64 transitions. Word has length 18 [2022-12-14 15:01:03,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:03,738 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 64 transitions. [2022-12-14 15:01:03,738 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 10 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 15:01:03,738 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 64 transitions. [2022-12-14 15:01:03,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2022-12-14 15:01:03,738 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:03,738 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:03,743 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2022-12-14 15:01:03,939 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:03,939 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:03,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:03,939 INFO L85 PathProgramCache]: Analyzing trace with hash -1056448649, now seen corresponding path program 5 times [2022-12-14 15:01:03,940 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:03,940 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1410313373] [2022-12-14 15:01:03,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:03,940 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:03,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:04,044 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:04,044 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:04,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1410313373] [2022-12-14 15:01:04,045 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1410313373] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:04,045 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [139292804] [2022-12-14 15:01:04,045 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:01:04,045 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:04,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:04,046 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:04,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-12-14 15:01:04,084 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 15:01:04,084 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:01:04,085 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 15:01:04,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:04,143 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:04,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:04,208 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:04,208 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [139292804] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:04,208 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [297857112] [2022-12-14 15:01:04,210 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:04,210 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:04,210 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:04,211 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:04,211 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:04,633 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:06,410 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1885#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:06,410 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:06,410 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:06,410 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 13 [2022-12-14 15:01:06,410 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615961468] [2022-12-14 15:01:06,410 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:06,410 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 15:01:06,411 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:06,411 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 15:01:06,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=429, Unknown=0, NotChecked=0, Total=506 [2022-12-14 15:01:06,411 INFO L87 Difference]: Start difference. First operand 48 states and 64 transitions. Second operand has 13 states, 13 states have (on average 2.769230769230769) internal successors, (36), 13 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 15:01:06,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:06,543 INFO L93 Difference]: Finished difference Result 66 states and 84 transitions. [2022-12-14 15:01:06,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-12-14 15:01:06,543 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.769230769230769) internal successors, (36), 13 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 18 [2022-12-14 15:01:06,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:06,544 INFO L225 Difference]: With dead ends: 66 [2022-12-14 15:01:06,544 INFO L226 Difference]: Without dead ends: 58 [2022-12-14 15:01:06,544 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=97, Invalid=553, Unknown=0, NotChecked=0, Total=650 [2022-12-14 15:01:06,544 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 72 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:06,545 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 80 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:01:06,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2022-12-14 15:01:06,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 50. [2022-12-14 15:01:06,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.346938775510204) internal successors, (66), 49 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:06,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 66 transitions. [2022-12-14 15:01:06,553 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 66 transitions. Word has length 18 [2022-12-14 15:01:06,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:06,554 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 66 transitions. [2022-12-14 15:01:06,554 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.769230769230769) internal successors, (36), 13 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 15:01:06,554 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 66 transitions. [2022-12-14 15:01:06,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 15:01:06,554 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:06,554 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:06,558 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2022-12-14 15:01:06,754 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-12-14 15:01:06,755 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:06,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:06,757 INFO L85 PathProgramCache]: Analyzing trace with hash 640560840, now seen corresponding path program 6 times [2022-12-14 15:01:06,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:06,757 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1839037286] [2022-12-14 15:01:06,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:06,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:06,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:06,878 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-12-14 15:01:06,878 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:06,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1839037286] [2022-12-14 15:01:06,879 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1839037286] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:06,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [10497027] [2022-12-14 15:01:06,879 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:01:06,879 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:06,879 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:06,880 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:06,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-12-14 15:01:06,923 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:01:06,923 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:01:06,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 15:01:06,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:06,968 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:01:06,968 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:07,031 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:01:07,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [10497027] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:07,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1696436591] [2022-12-14 15:01:07,033 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:07,033 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:07,033 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:07,033 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:07,033 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:07,395 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:09,398 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2235#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:09,398 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:09,398 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:09,398 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 14 [2022-12-14 15:01:09,399 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1491915085] [2022-12-14 15:01:09,399 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:09,399 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 15:01:09,399 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:09,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 15:01:09,400 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2022-12-14 15:01:09,400 INFO L87 Difference]: Start difference. First operand 50 states and 66 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:09,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:09,582 INFO L93 Difference]: Finished difference Result 77 states and 97 transitions. [2022-12-14 15:01:09,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 15:01:09,582 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-12-14 15:01:09,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:09,583 INFO L225 Difference]: With dead ends: 77 [2022-12-14 15:01:09,583 INFO L226 Difference]: Without dead ends: 59 [2022-12-14 15:01:09,584 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=130, Invalid=682, Unknown=0, NotChecked=0, Total=812 [2022-12-14 15:01:09,584 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 74 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:09,584 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 64 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:01:09,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-12-14 15:01:09,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 50. [2022-12-14 15:01:09,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.3265306122448979) internal successors, (65), 49 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:09,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 65 transitions. [2022-12-14 15:01:09,593 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 65 transitions. Word has length 19 [2022-12-14 15:01:09,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:09,594 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 65 transitions. [2022-12-14 15:01:09,594 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:09,594 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 65 transitions. [2022-12-14 15:01:09,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 15:01:09,594 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:09,594 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:09,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-12-14 15:01:09,794 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-12-14 15:01:09,796 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:09,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:09,797 INFO L85 PathProgramCache]: Analyzing trace with hash 2072678423, now seen corresponding path program 7 times [2022-12-14 15:01:09,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:09,797 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502113855] [2022-12-14 15:01:09,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:09,798 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:09,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:10,015 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:01:10,015 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:10,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502113855] [2022-12-14 15:01:10,015 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1502113855] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:10,015 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1069618512] [2022-12-14 15:01:10,015 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:01:10,015 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:10,015 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:10,016 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:10,017 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-12-14 15:01:10,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:10,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 15:01:10,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:10,132 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:01:10,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:10,223 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:01:10,224 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1069618512] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:10,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [568234224] [2022-12-14 15:01:10,225 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:10,225 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:10,225 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:10,225 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:10,225 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:10,571 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:12,346 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2619#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:12,346 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:12,346 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:12,346 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2022-12-14 15:01:12,347 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761843199] [2022-12-14 15:01:12,347 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:12,347 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 15:01:12,347 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:12,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 15:01:12,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=895, Unknown=0, NotChecked=0, Total=992 [2022-12-14 15:01:12,348 INFO L87 Difference]: Start difference. First operand 50 states and 65 transitions. Second operand has 22 states, 22 states have (on average 1.4545454545454546) internal successors, (32), 22 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:12,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:12,680 INFO L93 Difference]: Finished difference Result 116 states and 145 transitions. [2022-12-14 15:01:12,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-12-14 15:01:12,681 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.4545454545454546) internal successors, (32), 22 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-12-14 15:01:12,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:12,682 INFO L225 Difference]: With dead ends: 116 [2022-12-14 15:01:12,682 INFO L226 Difference]: Without dead ends: 110 [2022-12-14 15:01:12,683 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 33 SyntacticMatches, 6 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=201, Invalid=1779, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 15:01:12,683 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 83 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 404 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 405 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 404 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:12,684 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 175 Invalid, 405 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 404 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:01:12,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2022-12-14 15:01:12,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 65. [2022-12-14 15:01:12,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 64 states have (on average 1.34375) internal successors, (86), 64 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:12,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 86 transitions. [2022-12-14 15:01:12,700 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 86 transitions. Word has length 19 [2022-12-14 15:01:12,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:12,700 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 86 transitions. [2022-12-14 15:01:12,701 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.4545454545454546) internal successors, (32), 22 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:12,701 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 86 transitions. [2022-12-14 15:01:12,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-12-14 15:01:12,701 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:12,701 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:12,706 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-12-14 15:01:12,902 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:12,902 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:12,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:12,903 INFO L85 PathProgramCache]: Analyzing trace with hash -864062990, now seen corresponding path program 8 times [2022-12-14 15:01:12,904 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:12,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833490318] [2022-12-14 15:01:12,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:12,904 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:12,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:13,019 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-12-14 15:01:13,019 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:13,019 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833490318] [2022-12-14 15:01:13,019 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1833490318] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:13,020 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [21558209] [2022-12-14 15:01:13,020 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:01:13,020 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:13,020 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:13,021 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:13,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-12-14 15:01:13,057 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 15:01:13,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:01:13,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 15:01:13,059 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:13,106 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:01:13,106 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:13,162 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:01:13,163 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [21558209] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:13,163 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [831648166] [2022-12-14 15:01:13,164 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:13,164 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:13,164 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:13,164 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:13,164 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:13,771 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:15,520 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3107#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:15,520 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:15,520 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:15,520 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 7] total 14 [2022-12-14 15:01:15,520 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2072258058] [2022-12-14 15:01:15,520 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:15,520 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 15:01:15,521 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:15,521 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 15:01:15,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=471, Unknown=0, NotChecked=0, Total=552 [2022-12-14 15:01:15,521 INFO L87 Difference]: Start difference. First operand 65 states and 86 transitions. Second operand has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:15,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:15,651 INFO L93 Difference]: Finished difference Result 79 states and 99 transitions. [2022-12-14 15:01:15,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 15:01:15,651 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2022-12-14 15:01:15,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:15,652 INFO L225 Difference]: With dead ends: 79 [2022-12-14 15:01:15,652 INFO L226 Difference]: Without dead ends: 67 [2022-12-14 15:01:15,652 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=114, Invalid=642, Unknown=0, NotChecked=0, Total=756 [2022-12-14 15:01:15,652 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 73 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 73 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:15,653 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [73 Valid, 93 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:01:15,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2022-12-14 15:01:15,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 63. [2022-12-14 15:01:15,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.3064516129032258) internal successors, (81), 62 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 15:01:15,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 81 transitions. [2022-12-14 15:01:15,666 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 81 transitions. Word has length 19 [2022-12-14 15:01:15,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:15,667 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 81 transitions. [2022-12-14 15:01:15,667 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.142857142857143) internal successors, (30), 14 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:15,667 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 81 transitions. [2022-12-14 15:01:15,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-12-14 15:01:15,667 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:15,667 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:15,671 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2022-12-14 15:01:15,868 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-12-14 15:01:15,868 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:15,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:15,869 INFO L85 PathProgramCache]: Analyzing trace with hash 291369847, now seen corresponding path program 9 times [2022-12-14 15:01:15,869 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:15,870 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1148230239] [2022-12-14 15:01:15,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:15,870 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:15,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:16,001 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:16,001 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:16,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1148230239] [2022-12-14 15:01:16,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1148230239] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:16,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2040671671] [2022-12-14 15:01:16,001 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:01:16,001 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:16,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:16,002 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:16,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-12-14 15:01:16,064 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:01:16,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:01:16,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 15:01:16,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:16,161 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:16,161 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:16,268 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:16,268 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2040671671] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:16,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1744678796] [2022-12-14 15:01:16,270 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:16,270 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:16,270 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:16,270 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:16,271 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:16,711 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:18,232 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3522#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:18,232 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:18,232 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:18,232 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 19 [2022-12-14 15:01:18,232 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129284703] [2022-12-14 15:01:18,232 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:18,233 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 15:01:18,233 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:18,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 15:01:18,234 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=717, Unknown=0, NotChecked=0, Total=812 [2022-12-14 15:01:18,234 INFO L87 Difference]: Start difference. First operand 63 states and 81 transitions. Second operand has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:18,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:18,528 INFO L93 Difference]: Finished difference Result 95 states and 118 transitions. [2022-12-14 15:01:18,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 15:01:18,528 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-12-14 15:01:18,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:18,529 INFO L225 Difference]: With dead ends: 95 [2022-12-14 15:01:18,529 INFO L226 Difference]: Without dead ends: 78 [2022-12-14 15:01:18,529 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 246 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=231, Invalid=1251, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 15:01:18,529 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 150 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:18,530 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 124 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:01:18,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2022-12-14 15:01:18,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 61. [2022-12-14 15:01:18,545 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.3166666666666667) internal successors, (79), 60 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:18,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 79 transitions. [2022-12-14 15:01:18,546 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 79 transitions. Word has length 20 [2022-12-14 15:01:18,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:18,546 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 79 transitions. [2022-12-14 15:01:18,546 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:18,546 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 79 transitions. [2022-12-14 15:01:18,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-12-14 15:01:18,546 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:18,546 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:18,551 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-12-14 15:01:18,747 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-12-14 15:01:18,747 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:18,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:18,747 INFO L85 PathProgramCache]: Analyzing trace with hash 692712964, now seen corresponding path program 10 times [2022-12-14 15:01:18,747 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:18,747 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368713872] [2022-12-14 15:01:18,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:18,748 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:18,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:18,841 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:18,841 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:18,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [368713872] [2022-12-14 15:01:18,841 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [368713872] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:18,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2020762315] [2022-12-14 15:01:18,841 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:01:18,841 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:18,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:18,842 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:18,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-12-14 15:01:18,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:18,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 15:01:18,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:19,002 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:19,002 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:19,099 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:19,099 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2020762315] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:19,099 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2051567245] [2022-12-14 15:01:19,100 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:19,100 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:19,101 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:19,101 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:19,101 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:19,496 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:21,101 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3973#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:21,101 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:21,101 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:21,101 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 19 [2022-12-14 15:01:21,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428135846] [2022-12-14 15:01:21,101 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:21,101 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 15:01:21,102 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:21,102 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 15:01:21,102 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=717, Unknown=0, NotChecked=0, Total=812 [2022-12-14 15:01:21,103 INFO L87 Difference]: Start difference. First operand 61 states and 79 transitions. Second operand has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:21,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:21,367 INFO L93 Difference]: Finished difference Result 88 states and 108 transitions. [2022-12-14 15:01:21,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2022-12-14 15:01:21,368 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2022-12-14 15:01:21,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:21,368 INFO L225 Difference]: With dead ends: 88 [2022-12-14 15:01:21,368 INFO L226 Difference]: Without dead ends: 80 [2022-12-14 15:01:21,368 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 180 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=144, Invalid=1046, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 15:01:21,369 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 159 mSDsluCounter, 206 mSDsCounter, 0 mSdLazyCounter, 310 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 227 SdHoareTripleChecker+Invalid, 314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 310 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:21,369 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 227 Invalid, 314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 310 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:01:21,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-12-14 15:01:21,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 63. [2022-12-14 15:01:21,391 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 62 states have (on average 1.3064516129032258) internal successors, (81), 62 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 15:01:21,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 81 transitions. [2022-12-14 15:01:21,392 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 81 transitions. Word has length 20 [2022-12-14 15:01:21,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:21,392 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 81 transitions. [2022-12-14 15:01:21,392 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 2.210526315789474) internal successors, (42), 19 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:21,392 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 81 transitions. [2022-12-14 15:01:21,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-12-14 15:01:21,393 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:21,393 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:21,397 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2022-12-14 15:01:21,593 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-12-14 15:01:21,594 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:21,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:21,595 INFO L85 PathProgramCache]: Analyzing trace with hash 1507550131, now seen corresponding path program 11 times [2022-12-14 15:01:21,595 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:21,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [568408819] [2022-12-14 15:01:21,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:21,597 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:21,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:21,671 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 15:01:21,671 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:21,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [568408819] [2022-12-14 15:01:21,671 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [568408819] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:21,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1258327463] [2022-12-14 15:01:21,671 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:01:21,671 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:21,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:21,672 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:21,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-12-14 15:01:21,718 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 15:01:21,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:01:21,719 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 15:01:21,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:21,744 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 15:01:21,744 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:21,766 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 15:01:21,767 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1258327463] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:21,767 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1145198145] [2022-12-14 15:01:21,768 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:21,768 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:21,769 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:21,769 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:21,769 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:22,123 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:23,592 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4398#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:23,592 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:23,592 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:23,593 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 11 [2022-12-14 15:01:23,593 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711547058] [2022-12-14 15:01:23,593 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:23,593 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-12-14 15:01:23,593 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:23,593 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-12-14 15:01:23,593 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2022-12-14 15:01:23,593 INFO L87 Difference]: Start difference. First operand 63 states and 81 transitions. Second operand has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 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 15:01:23,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:23,658 INFO L93 Difference]: Finished difference Result 73 states and 90 transitions. [2022-12-14 15:01:23,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 15:01:23,658 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 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) Word has length 20 [2022-12-14 15:01:23,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:23,659 INFO L225 Difference]: With dead ends: 73 [2022-12-14 15:01:23,659 INFO L226 Difference]: Without dead ends: 69 [2022-12-14 15:01:23,659 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=98, Invalid=364, Unknown=0, NotChecked=0, Total=462 [2022-12-14 15:01:23,660 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 22 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:23,660 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 52 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:01:23,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2022-12-14 15:01:23,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 52. [2022-12-14 15:01:23,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 51 states have (on average 1.2941176470588236) internal successors, (66), 51 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:23,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2022-12-14 15:01:23,677 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 20 [2022-12-14 15:01:23,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:23,678 INFO L495 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2022-12-14 15:01:23,678 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 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 15:01:23,678 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2022-12-14 15:01:23,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2022-12-14 15:01:23,678 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:23,678 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:23,682 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2022-12-14 15:01:23,878 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-12-14 15:01:23,879 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:23,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:23,880 INFO L85 PathProgramCache]: Analyzing trace with hash -552010092, now seen corresponding path program 12 times [2022-12-14 15:01:23,880 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:23,881 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2067443543] [2022-12-14 15:01:23,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:23,881 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:23,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:23,960 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 15:01:23,960 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:23,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2067443543] [2022-12-14 15:01:23,960 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2067443543] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:23,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1198277034] [2022-12-14 15:01:23,961 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:01:23,961 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:23,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:23,962 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:23,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-12-14 15:01:24,004 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:01:24,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:01:24,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 6 conjunts are in the unsatisfiable core [2022-12-14 15:01:24,006 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:24,029 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 15:01:24,030 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:24,052 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 15:01:24,053 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1198277034] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:24,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [564320502] [2022-12-14 15:01:24,054 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:24,054 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:24,054 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:24,055 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:24,055 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:24,433 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:25,919 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4765#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:25,919 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:25,920 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:25,920 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 11 [2022-12-14 15:01:25,920 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [679821643] [2022-12-14 15:01:25,920 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:25,920 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-12-14 15:01:25,920 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:25,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-12-14 15:01:25,921 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=327, Unknown=0, NotChecked=0, Total=420 [2022-12-14 15:01:25,921 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 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 15:01:25,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:25,991 INFO L93 Difference]: Finished difference Result 82 states and 102 transitions. [2022-12-14 15:01:25,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-12-14 15:01:25,991 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 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) Word has length 20 [2022-12-14 15:01:25,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:25,992 INFO L225 Difference]: With dead ends: 82 [2022-12-14 15:01:25,992 INFO L226 Difference]: Without dead ends: 59 [2022-12-14 15:01:25,992 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=101, Invalid=361, Unknown=0, NotChecked=0, Total=462 [2022-12-14 15:01:25,992 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 40 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:25,993 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [40 Valid, 67 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:01:25,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2022-12-14 15:01:26,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 55. [2022-12-14 15:01:26,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2777777777777777) internal successors, (69), 54 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 15:01:26,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 69 transitions. [2022-12-14 15:01:26,010 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 69 transitions. Word has length 20 [2022-12-14 15:01:26,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:26,010 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 69 transitions. [2022-12-14 15:01:26,010 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.272727272727273) internal successors, (25), 11 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 15:01:26,010 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 69 transitions. [2022-12-14 15:01:26,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-12-14 15:01:26,010 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:26,010 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:26,015 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2022-12-14 15:01:26,211 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:26,211 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:26,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:26,212 INFO L85 PathProgramCache]: Analyzing trace with hash 462113578, now seen corresponding path program 13 times [2022-12-14 15:01:26,213 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:26,213 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1053192324] [2022-12-14 15:01:26,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:26,214 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:26,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:26,455 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:01:26,456 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:26,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1053192324] [2022-12-14 15:01:26,456 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1053192324] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:26,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [278690012] [2022-12-14 15:01:26,456 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:01:26,456 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:26,456 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:26,457 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:26,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-12-14 15:01:26,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:26,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 38 conjunts are in the unsatisfiable core [2022-12-14 15:01:26,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:26,592 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:01:26,592 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:26,712 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:01:26,712 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [278690012] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:26,712 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [104268068] [2022-12-14 15:01:26,714 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:26,714 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:26,714 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:26,714 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:26,714 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:27,069 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:28,682 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5176#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:28,683 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:28,683 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:28,683 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2022-12-14 15:01:28,683 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1271751462] [2022-12-14 15:01:28,683 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:28,683 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 15:01:28,683 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:28,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 15:01:28,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1086, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 15:01:28,685 INFO L87 Difference]: Start difference. First operand 55 states and 69 transitions. Second operand has 25 states, 25 states have (on average 1.4) internal successors, (35), 25 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 15:01:29,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:29,131 INFO L93 Difference]: Finished difference Result 111 states and 130 transitions. [2022-12-14 15:01:29,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 15:01:29,131 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.4) internal successors, (35), 25 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2022-12-14 15:01:29,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:29,132 INFO L225 Difference]: With dead ends: 111 [2022-12-14 15:01:29,132 INFO L226 Difference]: Without dead ends: 105 [2022-12-14 15:01:29,133 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 38 SyntacticMatches, 6 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 428 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=219, Invalid=2231, Unknown=0, NotChecked=0, Total=2450 [2022-12-14 15:01:29,134 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 98 mSDsluCounter, 241 mSDsCounter, 0 mSdLazyCounter, 667 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 668 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 667 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:29,134 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [98 Valid, 258 Invalid, 668 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 667 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:01:29,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2022-12-14 15:01:29,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 61. [2022-12-14 15:01:29,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.2666666666666666) internal successors, (76), 60 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 15:01:29,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 76 transitions. [2022-12-14 15:01:29,164 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 76 transitions. Word has length 21 [2022-12-14 15:01:29,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:29,165 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 76 transitions. [2022-12-14 15:01:29,165 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.4) internal successors, (35), 25 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 15:01:29,165 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 76 transitions. [2022-12-14 15:01:29,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2022-12-14 15:01:29,165 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:29,165 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:29,169 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-12-14 15:01:29,365 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:29,366 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:29,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:29,368 INFO L85 PathProgramCache]: Analyzing trace with hash -540380048, now seen corresponding path program 14 times [2022-12-14 15:01:29,368 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:29,369 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2130259465] [2022-12-14 15:01:29,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:29,370 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:29,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:29,585 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:01:29,585 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:29,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2130259465] [2022-12-14 15:01:29,586 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2130259465] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:29,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [792068909] [2022-12-14 15:01:29,586 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:01:29,586 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:29,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:29,587 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:29,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-12-14 15:01:29,635 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2022-12-14 15:01:29,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:01:29,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 15:01:29,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:29,751 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:01:29,751 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:29,869 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:01:29,869 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [792068909] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:29,869 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [340110711] [2022-12-14 15:01:29,870 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:29,870 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:29,871 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:29,871 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:29,871 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:30,231 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:32,009 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5672#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:32,009 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:32,010 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:32,010 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 24 [2022-12-14 15:01:32,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304475331] [2022-12-14 15:01:32,010 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:32,010 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-12-14 15:01:32,010 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:32,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-12-14 15:01:32,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1015, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 15:01:32,011 INFO L87 Difference]: Start difference. First operand 61 states and 76 transitions. Second operand has 24 states, 24 states have (on average 1.5) internal successors, (36), 24 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 15:01:32,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:32,413 INFO L93 Difference]: Finished difference Result 88 states and 105 transitions. [2022-12-14 15:01:32,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 15:01:32,413 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.5) internal successors, (36), 24 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 21 [2022-12-14 15:01:32,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:32,413 INFO L225 Difference]: With dead ends: 88 [2022-12-14 15:01:32,414 INFO L226 Difference]: Without dead ends: 84 [2022-12-14 15:01:32,414 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 34 SyntacticMatches, 9 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 414 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=206, Invalid=1864, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 15:01:32,414 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 60 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 350 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 350 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:32,415 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 172 Invalid, 351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 350 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:01:32,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-12-14 15:01:32,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 68. [2022-12-14 15:01:32,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.2686567164179106) internal successors, (85), 67 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 15:01:32,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 85 transitions. [2022-12-14 15:01:32,440 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 85 transitions. Word has length 21 [2022-12-14 15:01:32,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:32,441 INFO L495 AbstractCegarLoop]: Abstraction has 68 states and 85 transitions. [2022-12-14 15:01:32,441 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.5) internal successors, (36), 24 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 15:01:32,441 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 85 transitions. [2022-12-14 15:01:32,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-12-14 15:01:32,441 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:32,441 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:32,445 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Ended with exit code 0 [2022-12-14 15:01:32,641 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:32,642 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:32,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:32,643 INFO L85 PathProgramCache]: Analyzing trace with hash 1903467204, now seen corresponding path program 15 times [2022-12-14 15:01:32,643 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:32,644 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [291458387] [2022-12-14 15:01:32,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:32,645 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:32,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:32,803 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:32,804 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:32,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [291458387] [2022-12-14 15:01:32,804 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [291458387] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:32,804 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603513646] [2022-12-14 15:01:32,804 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:01:32,804 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:32,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:32,805 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:32,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-12-14 15:01:32,845 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:01:32,846 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:01:32,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 15:01:32,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:33,010 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:33,010 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:33,152 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:33,152 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [603513646] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:33,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1529295094] [2022-12-14 15:01:33,154 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:33,154 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:33,154 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:33,154 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:33,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:33,511 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:35,378 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6144#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:35,378 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:35,378 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:35,378 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 24 [2022-12-14 15:01:35,378 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898662035] [2022-12-14 15:01:35,378 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:35,379 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-12-14 15:01:35,379 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:35,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-12-14 15:01:35,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=1013, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 15:01:35,380 INFO L87 Difference]: Start difference. First operand 68 states and 85 transitions. Second operand has 24 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 24 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 15:01:36,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:36,079 INFO L93 Difference]: Finished difference Result 116 states and 139 transitions. [2022-12-14 15:01:36,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 15:01:36,079 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 24 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) Word has length 22 [2022-12-14 15:01:36,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:36,080 INFO L225 Difference]: With dead ends: 116 [2022-12-14 15:01:36,080 INFO L226 Difference]: Without dead ends: 97 [2022-12-14 15:01:36,081 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 425 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=407, Invalid=2143, Unknown=0, NotChecked=0, Total=2550 [2022-12-14 15:01:36,081 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 240 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 260 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 240 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 260 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:36,082 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [240 Valid, 171 Invalid, 270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 260 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:01:36,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-12-14 15:01:36,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 71. [2022-12-14 15:01:36,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.2857142857142858) internal successors, (90), 70 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:36,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 90 transitions. [2022-12-14 15:01:36,108 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 90 transitions. Word has length 22 [2022-12-14 15:01:36,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:36,108 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 90 transitions. [2022-12-14 15:01:36,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 24 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 15:01:36,109 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 90 transitions. [2022-12-14 15:01:36,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-12-14 15:01:36,109 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:36,109 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:36,114 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2022-12-14 15:01:36,310 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2022-12-14 15:01:36,310 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:36,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:36,311 INFO L85 PathProgramCache]: Analyzing trace with hash 1460201943, now seen corresponding path program 16 times [2022-12-14 15:01:36,311 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:36,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1022359320] [2022-12-14 15:01:36,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:36,312 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:36,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:36,466 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:36,466 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:36,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1022359320] [2022-12-14 15:01:36,466 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1022359320] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:36,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1445488556] [2022-12-14 15:01:36,466 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:01:36,467 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:36,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:36,467 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:36,469 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-12-14 15:01:36,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:36,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 15:01:36,507 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:36,659 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:36,659 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:36,817 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:36,817 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1445488556] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:36,817 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [39517280] [2022-12-14 15:01:36,818 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:36,818 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:36,818 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:36,818 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:36,818 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:37,176 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:39,063 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6684#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:39,063 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:39,063 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:39,063 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 24 [2022-12-14 15:01:39,063 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144513098] [2022-12-14 15:01:39,063 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:39,064 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2022-12-14 15:01:39,064 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:39,064 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2022-12-14 15:01:39,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=1013, Unknown=0, NotChecked=0, Total=1122 [2022-12-14 15:01:39,065 INFO L87 Difference]: Start difference. First operand 71 states and 90 transitions. Second operand has 24 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 24 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 15:01:39,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:39,525 INFO L93 Difference]: Finished difference Result 108 states and 129 transitions. [2022-12-14 15:01:39,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2022-12-14 15:01:39,526 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 24 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) Word has length 22 [2022-12-14 15:01:39,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:39,526 INFO L225 Difference]: With dead ends: 108 [2022-12-14 15:01:39,526 INFO L226 Difference]: Without dead ends: 99 [2022-12-14 15:01:39,527 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 273 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=192, Invalid=1614, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 15:01:39,527 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 257 mSDsluCounter, 277 mSDsCounter, 0 mSdLazyCounter, 400 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 257 SdHoareTripleChecker+Valid, 305 SdHoareTripleChecker+Invalid, 409 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 400 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:39,527 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [257 Valid, 305 Invalid, 409 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 400 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:01:39,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-12-14 15:01:39,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 73. [2022-12-14 15:01:39,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.2777777777777777) internal successors, (92), 72 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:39,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 92 transitions. [2022-12-14 15:01:39,561 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 92 transitions. Word has length 22 [2022-12-14 15:01:39,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:39,561 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 92 transitions. [2022-12-14 15:01:39,561 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.9583333333333333) internal successors, (47), 24 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 15:01:39,561 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 92 transitions. [2022-12-14 15:01:39,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-12-14 15:01:39,561 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:39,562 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:39,566 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Ended with exit code 0 [2022-12-14 15:01:39,762 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-12-14 15:01:39,763 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:39,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:39,764 INFO L85 PathProgramCache]: Analyzing trace with hash -179848684, now seen corresponding path program 17 times [2022-12-14 15:01:39,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:39,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137322654] [2022-12-14 15:01:39,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:39,765 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:39,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:39,834 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 15:01:39,834 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:39,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137322654] [2022-12-14 15:01:39,834 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1137322654] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:39,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [606013070] [2022-12-14 15:01:39,835 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:01:39,835 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:39,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:39,836 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:39,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-12-14 15:01:39,873 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 15:01:39,873 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:01:39,874 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 7 conjunts are in the unsatisfiable core [2022-12-14 15:01:39,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:39,913 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 15:01:39,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:39,943 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 15:01:39,943 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [606013070] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:39,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1383263199] [2022-12-14 15:01:39,944 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:39,944 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:39,944 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:39,945 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:39,945 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:40,320 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:42,018 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7185#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:42,018 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:42,018 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:42,018 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2022-12-14 15:01:42,018 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1409671212] [2022-12-14 15:01:42,019 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:42,019 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 15:01:42,019 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:42,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 15:01:42,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=416, Unknown=0, NotChecked=0, Total=506 [2022-12-14 15:01:42,019 INFO L87 Difference]: Start difference. First operand 73 states and 92 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:42,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:42,132 INFO L93 Difference]: Finished difference Result 158 states and 199 transitions. [2022-12-14 15:01:42,133 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 15:01:42,133 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have 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 15:01:42,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:42,133 INFO L225 Difference]: With dead ends: 158 [2022-12-14 15:01:42,133 INFO L226 Difference]: Without dead ends: 126 [2022-12-14 15:01:42,133 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 46 SyntacticMatches, 5 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2022-12-14 15:01:42,134 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 118 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 118 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:42,134 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [118 Valid, 62 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:01:42,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2022-12-14 15:01:42,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 91. [2022-12-14 15:01:42,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 90 states have (on average 1.2777777777777777) internal successors, (115), 90 states have internal predecessors, (115), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:42,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 115 transitions. [2022-12-14 15:01:42,170 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 115 transitions. Word has length 22 [2022-12-14 15:01:42,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:42,170 INFO L495 AbstractCegarLoop]: Abstraction has 91 states and 115 transitions. [2022-12-14 15:01:42,170 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:42,170 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 115 transitions. [2022-12-14 15:01:42,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-12-14 15:01:42,171 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:42,171 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:42,175 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Ended with exit code 0 [2022-12-14 15:01:42,371 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-12-14 15:01:42,372 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:42,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:42,373 INFO L85 PathProgramCache]: Analyzing trace with hash 398293843, now seen corresponding path program 18 times [2022-12-14 15:01:42,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:42,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1310489108] [2022-12-14 15:01:42,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:42,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:42,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:42,449 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 15:01:42,449 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:42,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1310489108] [2022-12-14 15:01:42,449 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1310489108] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:42,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [678384258] [2022-12-14 15:01:42,449 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:01:42,449 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:42,449 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:42,450 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:42,451 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-12-14 15:01:42,486 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:01:42,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:01:42,487 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 7 conjunts are in the unsatisfiable core [2022-12-14 15:01:42,488 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:42,524 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 15:01:42,525 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:42,552 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2022-12-14 15:01:42,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [678384258] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:42,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1230653602] [2022-12-14 15:01:42,553 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:42,554 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:42,554 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:42,554 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:42,554 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:42,888 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:44,461 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7812#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:44,461 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:44,461 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:44,461 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2022-12-14 15:01:44,461 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103692864] [2022-12-14 15:01:44,461 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:44,462 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-12-14 15:01:44,462 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:44,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-12-14 15:01:44,462 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=407, Unknown=0, NotChecked=0, Total=506 [2022-12-14 15:01:44,462 INFO L87 Difference]: Start difference. First operand 91 states and 115 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:44,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:44,567 INFO L93 Difference]: Finished difference Result 126 states and 155 transitions. [2022-12-14 15:01:44,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 15:01:44,567 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have 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 15:01:44,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:44,568 INFO L225 Difference]: With dead ends: 126 [2022-12-14 15:01:44,568 INFO L226 Difference]: Without dead ends: 116 [2022-12-14 15:01:44,568 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 46 SyntacticMatches, 5 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=116, Invalid=484, Unknown=0, NotChecked=0, Total=600 [2022-12-14 15:01:44,568 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 27 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:44,568 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 75 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:01:44,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2022-12-14 15:01:44,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 106. [2022-12-14 15:01:44,615 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 105 states have (on average 1.2857142857142858) internal successors, (135), 105 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 15:01:44,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 135 transitions. [2022-12-14 15:01:44,615 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 135 transitions. Word has length 22 [2022-12-14 15:01:44,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:44,615 INFO L495 AbstractCegarLoop]: Abstraction has 106 states and 135 transitions. [2022-12-14 15:01:44,615 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:44,615 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 135 transitions. [2022-12-14 15:01:44,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-12-14 15:01:44,616 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:44,616 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:44,620 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-12-14 15:01:44,816 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:44,817 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:44,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:44,818 INFO L85 PathProgramCache]: Analyzing trace with hash -1515531849, now seen corresponding path program 19 times [2022-12-14 15:01:44,818 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:44,819 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319967289] [2022-12-14 15:01:44,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:44,819 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:44,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:45,037 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:01:45,037 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:45,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319967289] [2022-12-14 15:01:45,037 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [319967289] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:45,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1804597942] [2022-12-14 15:01:45,037 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:01:45,037 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:45,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:45,038 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:45,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-12-14 15:01:45,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:45,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 42 conjunts are in the unsatisfiable core [2022-12-14 15:01:45,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:45,260 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:01:45,260 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:45,362 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:01:45,362 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1804597942] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:45,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1142764359] [2022-12-14 15:01:45,363 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:45,363 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:45,363 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:45,363 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:45,364 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:45,701 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:47,667 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8427#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:47,667 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:47,667 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:47,667 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 29 [2022-12-14 15:01:47,667 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101723973] [2022-12-14 15:01:47,667 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:47,668 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-12-14 15:01:47,668 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:47,668 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-12-14 15:01:47,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1366, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 15:01:47,669 INFO L87 Difference]: Start difference. First operand 106 states and 135 transitions. Second operand has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:48,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:48,449 INFO L93 Difference]: Finished difference Result 201 states and 238 transitions. [2022-12-14 15:01:48,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 15:01:48,450 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-12-14 15:01:48,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:48,451 INFO L225 Difference]: With dead ends: 201 [2022-12-14 15:01:48,451 INFO L226 Difference]: Without dead ends: 195 [2022-12-14 15:01:48,452 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 621 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=243, Invalid=2837, Unknown=0, NotChecked=0, Total=3080 [2022-12-14 15:01:48,452 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 113 mSDsluCounter, 316 mSDsCounter, 0 mSdLazyCounter, 835 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 339 SdHoareTripleChecker+Invalid, 836 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 835 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:48,452 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [113 Valid, 339 Invalid, 836 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 835 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:01:48,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2022-12-14 15:01:48,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 112. [2022-12-14 15:01:48,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 111 states have (on average 1.2792792792792793) internal successors, (142), 111 states have internal predecessors, (142), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:48,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 142 transitions. [2022-12-14 15:01:48,505 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 142 transitions. Word has length 23 [2022-12-14 15:01:48,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:48,506 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 142 transitions. [2022-12-14 15:01:48,506 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.3793103448275863) internal successors, (40), 29 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:48,506 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 142 transitions. [2022-12-14 15:01:48,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-12-14 15:01:48,506 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:48,506 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:48,510 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2022-12-14 15:01:48,707 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-12-14 15:01:48,707 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:48,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:48,708 INFO L85 PathProgramCache]: Analyzing trace with hash 912762354, now seen corresponding path program 20 times [2022-12-14 15:01:48,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:48,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1556786846] [2022-12-14 15:01:48,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:48,709 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:48,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:48,841 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 15:01:48,841 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:48,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1556786846] [2022-12-14 15:01:48,841 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1556786846] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:48,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2112519831] [2022-12-14 15:01:48,841 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:01:48,842 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:48,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:48,842 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:48,843 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-12-14 15:01:48,877 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 15:01:48,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:01:48,878 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 15:01:48,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:48,978 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-12-14 15:01:48,978 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:49,081 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-12-14 15:01:49,081 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2112519831] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:49,081 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1780504851] [2022-12-14 15:01:49,082 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:49,082 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:49,082 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:49,082 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:49,083 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:49,437 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:51,227 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9213#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:51,227 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:51,227 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:51,227 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 20 [2022-12-14 15:01:51,227 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [170171563] [2022-12-14 15:01:51,227 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:51,227 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 15:01:51,227 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:51,228 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 15:01:51,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=771, Unknown=0, NotChecked=0, Total=870 [2022-12-14 15:01:51,228 INFO L87 Difference]: Start difference. First operand 112 states and 142 transitions. Second operand has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 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 15:01:51,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:51,691 INFO L93 Difference]: Finished difference Result 169 states and 206 transitions. [2022-12-14 15:01:51,692 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 15:01:51,692 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 23 [2022-12-14 15:01:51,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:51,692 INFO L225 Difference]: With dead ends: 169 [2022-12-14 15:01:51,692 INFO L226 Difference]: Without dead ends: 140 [2022-12-14 15:01:51,693 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 259 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=258, Invalid=1382, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 15:01:51,693 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 173 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 173 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:51,693 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [173 Valid, 110 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 180 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:01:51,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2022-12-14 15:01:51,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 118. [2022-12-14 15:01:51,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.2564102564102564) internal successors, (147), 117 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 15:01:51,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 147 transitions. [2022-12-14 15:01:51,752 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 147 transitions. Word has length 23 [2022-12-14 15:01:51,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:51,752 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 147 transitions. [2022-12-14 15:01:51,753 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 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 15:01:51,753 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 147 transitions. [2022-12-14 15:01:51,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-12-14 15:01:51,753 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:51,753 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:51,758 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2022-12-14 15:01:51,954 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-12-14 15:01:51,955 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:51,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:51,956 INFO L85 PathProgramCache]: Analyzing trace with hash -1118349219, now seen corresponding path program 21 times [2022-12-14 15:01:51,956 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:51,957 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1692963221] [2022-12-14 15:01:51,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:51,957 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:51,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:52,123 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:01:52,124 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:52,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1692963221] [2022-12-14 15:01:52,124 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1692963221] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:52,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1536816822] [2022-12-14 15:01:52,124 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:01:52,124 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:52,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:52,125 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:52,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-12-14 15:01:52,173 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:01:52,173 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:01:52,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 38 conjunts are in the unsatisfiable core [2022-12-14 15:01:52,175 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:52,369 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:01:52,369 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:52,477 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:01:52,477 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1536816822] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:52,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [199028619] [2022-12-14 15:01:52,478 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:52,478 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:52,478 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:52,478 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:52,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:52,815 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:54,661 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9954#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:54,661 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:54,662 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:54,662 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 27 [2022-12-14 15:01:54,662 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933473540] [2022-12-14 15:01:54,662 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:54,662 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2022-12-14 15:01:54,662 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:54,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2022-12-14 15:01:54,663 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=1217, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 15:01:54,663 INFO L87 Difference]: Start difference. First operand 118 states and 147 transitions. Second operand has 27 states, 27 states have (on average 1.4444444444444444) internal successors, (39), 27 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 15:01:55,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:55,179 INFO L93 Difference]: Finished difference Result 174 states and 206 transitions. [2022-12-14 15:01:55,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-12-14 15:01:55,180 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.4444444444444444) internal successors, (39), 27 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) Word has length 23 [2022-12-14 15:01:55,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:55,181 INFO L225 Difference]: With dead ends: 174 [2022-12-14 15:01:55,181 INFO L226 Difference]: Without dead ends: 158 [2022-12-14 15:01:55,182 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 43 SyntacticMatches, 5 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 523 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=224, Invalid=2326, Unknown=0, NotChecked=0, Total=2550 [2022-12-14 15:01:55,183 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 85 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 543 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 85 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 544 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 543 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:55,183 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [85 Valid, 242 Invalid, 544 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 543 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:01:55,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2022-12-14 15:01:55,241 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 118. [2022-12-14 15:01:55,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.264957264957265) internal successors, (148), 117 states have internal predecessors, (148), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:55,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 148 transitions. [2022-12-14 15:01:55,242 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 148 transitions. Word has length 23 [2022-12-14 15:01:55,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:55,242 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 148 transitions. [2022-12-14 15:01:55,242 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.4444444444444444) internal successors, (39), 27 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 15:01:55,242 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 148 transitions. [2022-12-14 15:01:55,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2022-12-14 15:01:55,243 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:55,243 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:55,247 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Ended with exit code 0 [2022-12-14 15:01:55,443 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-12-14 15:01:55,444 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:55,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:55,445 INFO L85 PathProgramCache]: Analyzing trace with hash -91011384, now seen corresponding path program 22 times [2022-12-14 15:01:55,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:55,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761914058] [2022-12-14 15:01:55,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:55,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:55,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:55,566 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-12-14 15:01:55,566 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:55,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761914058] [2022-12-14 15:01:55,566 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1761914058] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:55,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045768111] [2022-12-14 15:01:55,566 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:01:55,566 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:55,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:55,567 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:55,568 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-12-14 15:01:55,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:55,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 15:01:55,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:55,707 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-12-14 15:01:55,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:55,810 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2022-12-14 15:01:55,810 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045768111] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:55,810 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2040071675] [2022-12-14 15:01:55,810 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:55,811 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:55,811 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:55,811 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:55,811 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:56,146 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:01:58,168 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '10700#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:01:58,168 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:01:58,168 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:01:58,168 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9, 9] total 20 [2022-12-14 15:01:58,168 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613290267] [2022-12-14 15:01:58,168 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:01:58,169 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 15:01:58,169 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:01:58,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 15:01:58,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=771, Unknown=0, NotChecked=0, Total=870 [2022-12-14 15:01:58,169 INFO L87 Difference]: Start difference. First operand 118 states and 148 transitions. Second operand has 20 states, 20 states have (on average 1.8) internal successors, (36), 20 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 15:01:58,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:01:58,582 INFO L93 Difference]: Finished difference Result 144 states and 172 transitions. [2022-12-14 15:01:58,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-12-14 15:01:58,582 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.8) internal successors, (36), 20 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 23 [2022-12-14 15:01:58,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:01:58,582 INFO L225 Difference]: With dead ends: 144 [2022-12-14 15:01:58,582 INFO L226 Difference]: Without dead ends: 128 [2022-12-14 15:01:58,583 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 46 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=165, Invalid=1167, Unknown=0, NotChecked=0, Total=1332 [2022-12-14 15:01:58,583 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 210 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:01:58,583 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [210 Valid, 207 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:01:58,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2022-12-14 15:01:58,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 118. [2022-12-14 15:01:58,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.2307692307692308) internal successors, (144), 117 states have internal predecessors, (144), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:01:58,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 144 transitions. [2022-12-14 15:01:58,648 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 144 transitions. Word has length 23 [2022-12-14 15:01:58,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:01:58,648 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 144 transitions. [2022-12-14 15:01:58,648 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.8) internal successors, (36), 20 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 15:01:58,648 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 144 transitions. [2022-12-14 15:01:58,648 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 15:01:58,648 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:01:58,648 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:01:58,653 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-12-14 15:01:58,849 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-12-14 15:01:58,850 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:01:58,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:01:58,851 INFO L85 PathProgramCache]: Analyzing trace with hash 726001111, now seen corresponding path program 23 times [2022-12-14 15:01:58,851 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:01:58,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [485410364] [2022-12-14 15:01:58,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:01:58,852 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:01:58,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:01:58,997 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:58,998 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:01:58,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [485410364] [2022-12-14 15:01:58,998 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [485410364] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:01:58,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1223871395] [2022-12-14 15:01:58,998 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:01:58,998 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:01:58,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:01:58,999 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:01:59,000 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-12-14 15:01:59,037 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 15:01:59,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:01:59,038 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 15:01:59,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:01:59,189 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:59,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:01:59,381 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:01:59,381 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1223871395] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:01:59,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [937157363] [2022-12-14 15:01:59,383 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:01:59,383 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:01:59,383 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:01:59,383 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:01:59,383 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:01:59,890 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:02:01,880 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11391#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:02:01,880 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:02:01,880 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:02:01,881 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 29 [2022-12-14 15:02:01,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618210834] [2022-12-14 15:02:01,881 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:02:01,881 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-12-14 15:02:01,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:02:01,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-12-14 15:02:01,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1359, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 15:02:01,882 INFO L87 Difference]: Start difference. First operand 118 states and 144 transitions. Second operand has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:03,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:02:03,073 INFO L93 Difference]: Finished difference Result 202 states and 237 transitions. [2022-12-14 15:02:03,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-12-14 15:02:03,073 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-12-14 15:02:03,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:02:03,074 INFO L225 Difference]: With dead ends: 202 [2022-12-14 15:02:03,074 INFO L226 Difference]: Without dead ends: 180 [2022-12-14 15:02:03,075 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 41 SyntacticMatches, 5 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 671 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=661, Invalid=3371, Unknown=0, NotChecked=0, Total=4032 [2022-12-14 15:02:03,076 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 451 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 378 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 451 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 395 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 378 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:02:03,076 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [451 Valid, 237 Invalid, 395 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 378 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:02:03,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2022-12-14 15:02:03,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 130. [2022-12-14 15:02:03,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 129 states have (on average 1.2325581395348837) internal successors, (159), 129 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 15:02:03,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 159 transitions. [2022-12-14 15:02:03,165 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 159 transitions. Word has length 24 [2022-12-14 15:02:03,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:02:03,166 INFO L495 AbstractCegarLoop]: Abstraction has 130 states and 159 transitions. [2022-12-14 15:02:03,166 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:03,166 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 159 transitions. [2022-12-14 15:02:03,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 15:02:03,166 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:02:03,166 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:02:03,171 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2022-12-14 15:02:03,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:03,367 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:02:03,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:02:03,367 INFO L85 PathProgramCache]: Analyzing trace with hash -130320092, now seen corresponding path program 24 times [2022-12-14 15:02:03,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:02:03,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250782060] [2022-12-14 15:02:03,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:02:03,368 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:02:03,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:03,541 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:02:03,541 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:02:03,541 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250782060] [2022-12-14 15:02:03,541 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250782060] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:02:03,542 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1083826181] [2022-12-14 15:02:03,542 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:02:03,542 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:03,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:02:03,543 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:02:03,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-12-14 15:02:03,588 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:02:03,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:02:03,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 15:02:03,590 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:02:03,793 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:02:03,793 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:02:03,958 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:02:03,958 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1083826181] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:02:03,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [554872653] [2022-12-14 15:02:03,959 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:02:03,959 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:02:03,959 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:02:03,959 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:02:03,959 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:02:04,299 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:02:06,136 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12250#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:02:06,136 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:02:06,137 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:02:06,137 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 29 [2022-12-14 15:02:06,137 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088100034] [2022-12-14 15:02:06,137 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:02:06,137 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-12-14 15:02:06,137 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:02:06,137 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-12-14 15:02:06,137 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1359, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 15:02:06,138 INFO L87 Difference]: Start difference. First operand 130 states and 159 transitions. Second operand has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:07,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:02:07,066 INFO L93 Difference]: Finished difference Result 193 states and 225 transitions. [2022-12-14 15:02:07,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 15:02:07,066 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 24 [2022-12-14 15:02:07,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:02:07,067 INFO L225 Difference]: With dead ends: 193 [2022-12-14 15:02:07,067 INFO L226 Difference]: Without dead ends: 183 [2022-12-14 15:02:07,067 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 41 SyntacticMatches, 5 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 385 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=246, Invalid=2304, Unknown=0, NotChecked=0, Total=2550 [2022-12-14 15:02:07,068 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 339 mSDsluCounter, 580 mSDsCounter, 0 mSdLazyCounter, 839 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 339 SdHoareTripleChecker+Valid, 615 SdHoareTripleChecker+Invalid, 854 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 839 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:02:07,068 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [339 Valid, 615 Invalid, 854 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 839 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:02:07,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2022-12-14 15:02:07,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 133. [2022-12-14 15:02:07,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.2272727272727273) internal successors, (162), 132 states have internal predecessors, (162), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:07,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 162 transitions. [2022-12-14 15:02:07,150 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 162 transitions. Word has length 24 [2022-12-14 15:02:07,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:02:07,150 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 162 transitions. [2022-12-14 15:02:07,150 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.793103448275862) internal successors, (52), 29 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:07,150 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 162 transitions. [2022-12-14 15:02:07,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 15:02:07,150 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:02:07,150 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:02:07,154 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2022-12-14 15:02:07,351 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:07,351 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:02:07,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:02:07,352 INFO L85 PathProgramCache]: Analyzing trace with hash -1002278247, now seen corresponding path program 25 times [2022-12-14 15:02:07,353 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:02:07,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1329054379] [2022-12-14 15:02:07,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:02:07,353 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:02:07,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:07,422 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 15:02:07,423 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:02:07,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1329054379] [2022-12-14 15:02:07,423 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1329054379] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:02:07,423 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2015958483] [2022-12-14 15:02:07,423 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:02:07,423 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:07,423 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:02:07,424 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:02:07,425 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-12-14 15:02:07,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:07,463 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 15:02:07,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:02:07,504 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 15:02:07,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:02:07,539 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 15:02:07,539 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2015958483] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:02:07,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1279365609] [2022-12-14 15:02:07,540 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:02:07,540 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:02:07,541 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:02:07,541 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:02:07,541 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:02:07,890 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:02:09,664 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13056#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:02:09,664 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:02:09,664 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:02:09,665 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-12-14 15:02:09,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668573404] [2022-12-14 15:02:09,665 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:02:09,665 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 15:02:09,665 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:02:09,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 15:02:09,666 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=115, Invalid=437, Unknown=0, NotChecked=0, Total=552 [2022-12-14 15:02:09,666 INFO L87 Difference]: Start difference. First operand 133 states and 162 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:09,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:02:09,906 INFO L93 Difference]: Finished difference Result 150 states and 177 transitions. [2022-12-14 15:02:09,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 15:02:09,907 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have 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 15:02:09,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:02:09,908 INFO L225 Difference]: With dead ends: 150 [2022-12-14 15:02:09,908 INFO L226 Difference]: Without dead ends: 146 [2022-12-14 15:02:09,908 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 51 SyntacticMatches, 6 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=147, Invalid=555, Unknown=0, NotChecked=0, Total=702 [2022-12-14 15:02:09,908 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 45 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:02:09,908 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 72 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:02:09,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2022-12-14 15:02:09,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 120. [2022-12-14 15:02:09,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 119 states have (on average 1.218487394957983) internal successors, (145), 119 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 15:02:09,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 145 transitions. [2022-12-14 15:02:09,982 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 145 transitions. Word has length 24 [2022-12-14 15:02:09,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:02:09,982 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 145 transitions. [2022-12-14 15:02:09,982 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:09,982 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 145 transitions. [2022-12-14 15:02:09,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2022-12-14 15:02:09,982 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:02:09,982 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:02:09,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2022-12-14 15:02:10,183 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:10,184 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:02:10,184 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:02:10,185 INFO L85 PathProgramCache]: Analyzing trace with hash -628248642, now seen corresponding path program 26 times [2022-12-14 15:02:10,185 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:02:10,185 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091216337] [2022-12-14 15:02:10,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:02:10,186 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:02:10,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:10,270 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 15:02:10,270 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:02:10,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091216337] [2022-12-14 15:02:10,270 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2091216337] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:02:10,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1410578878] [2022-12-14 15:02:10,270 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:02:10,271 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:10,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:02:10,271 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:02:10,272 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-12-14 15:02:10,310 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 15:02:10,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:02:10,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 8 conjunts are in the unsatisfiable core [2022-12-14 15:02:10,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:02:10,351 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 15:02:10,351 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:02:10,386 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 15:02:10,387 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1410578878] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:02:10,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2049223548] [2022-12-14 15:02:10,388 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:02:10,388 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:02:10,388 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:02:10,388 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:02:10,388 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:02:10,762 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:02:12,450 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13740#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:02:12,450 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:02:12,450 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:02:12,450 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2022-12-14 15:02:12,450 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615940825] [2022-12-14 15:02:12,450 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:02:12,451 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-12-14 15:02:12,451 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:02:12,451 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-12-14 15:02:12,451 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=434, Unknown=0, NotChecked=0, Total=552 [2022-12-14 15:02:12,452 INFO L87 Difference]: Start difference. First operand 120 states and 145 transitions. Second operand has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:12,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:02:12,646 INFO L93 Difference]: Finished difference Result 174 states and 208 transitions. [2022-12-14 15:02:12,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-12-14 15:02:12,646 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have 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 15:02:12,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:02:12,647 INFO L225 Difference]: With dead ends: 174 [2022-12-14 15:02:12,647 INFO L226 Difference]: Without dead ends: 135 [2022-12-14 15:02:12,647 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 51 SyntacticMatches, 6 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 269 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=150, Invalid=552, Unknown=0, NotChecked=0, Total=702 [2022-12-14 15:02:12,648 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 44 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:02:12,648 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 104 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:02:12,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2022-12-14 15:02:12,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 125. [2022-12-14 15:02:12,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 124 states have (on average 1.2096774193548387) internal successors, (150), 124 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:12,726 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 150 transitions. [2022-12-14 15:02:12,726 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 150 transitions. Word has length 24 [2022-12-14 15:02:12,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:02:12,727 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 150 transitions. [2022-12-14 15:02:12,727 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:12,727 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 150 transitions. [2022-12-14 15:02:12,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-12-14 15:02:12,727 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:02:12,727 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:02:12,732 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-12-14 15:02:12,927 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:12,928 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:02:12,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:02:12,929 INFO L85 PathProgramCache]: Analyzing trace with hash 717892618, now seen corresponding path program 27 times [2022-12-14 15:02:12,929 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:02:12,929 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136157694] [2022-12-14 15:02:12,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:02:12,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:02:12,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:13,181 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:02:13,181 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:02:13,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136157694] [2022-12-14 15:02:13,181 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136157694] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:02:13,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [853080403] [2022-12-14 15:02:13,181 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:02:13,182 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:13,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:02:13,183 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:02:13,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-12-14 15:02:13,218 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:02:13,218 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:02:13,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 46 conjunts are in the unsatisfiable core [2022-12-14 15:02:13,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:02:13,429 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:02:13,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:02:13,537 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:02:13,537 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [853080403] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:02:13,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1045900408] [2022-12-14 15:02:13,538 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:02:13,538 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:02:13,538 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:02:13,538 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:02:13,538 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:02:13,878 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:02:15,928 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '14506#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:02:15,928 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:02:15,928 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:02:15,928 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 32 [2022-12-14 15:02:15,928 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [86132466] [2022-12-14 15:02:15,928 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:02:15,928 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-12-14 15:02:15,928 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:02:15,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-12-14 15:02:15,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1599, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 15:02:15,929 INFO L87 Difference]: Start difference. First operand 125 states and 150 transitions. Second operand has 32 states, 32 states have (on average 1.34375) internal successors, (43), 32 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:16,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:02:16,857 INFO L93 Difference]: Finished difference Result 239 states and 271 transitions. [2022-12-14 15:02:16,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-12-14 15:02:16,857 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.34375) internal successors, (43), 32 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2022-12-14 15:02:16,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:02:16,858 INFO L225 Difference]: With dead ends: 239 [2022-12-14 15:02:16,858 INFO L226 Difference]: Without dead ends: 233 [2022-12-14 15:02:16,858 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 50 SyntacticMatches, 3 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 732 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=261, Invalid=3399, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 15:02:16,858 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 129 mSDsluCounter, 518 mSDsCounter, 0 mSdLazyCounter, 1327 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 547 SdHoareTripleChecker+Invalid, 1328 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 15:02:16,859 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [129 Valid, 547 Invalid, 1328 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1327 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 15:02:16,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2022-12-14 15:02:16,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 131. [2022-12-14 15:02:16,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.2076923076923076) internal successors, (157), 130 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 15:02:16,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 157 transitions. [2022-12-14 15:02:16,938 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 157 transitions. Word has length 25 [2022-12-14 15:02:16,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:02:16,939 INFO L495 AbstractCegarLoop]: Abstraction has 131 states and 157 transitions. [2022-12-14 15:02:16,939 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.34375) internal successors, (43), 32 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:16,939 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 157 transitions. [2022-12-14 15:02:16,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-12-14 15:02:16,939 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:02:16,939 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:02:16,944 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2022-12-14 15:02:17,139 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2022-12-14 15:02:17,139 INFO L420 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:02:17,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:02:17,140 INFO L85 PathProgramCache]: Analyzing trace with hash 152674512, now seen corresponding path program 28 times [2022-12-14 15:02:17,140 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:02:17,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2081419629] [2022-12-14 15:02:17,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:02:17,140 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:02:17,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:17,352 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:02:17,352 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:02:17,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2081419629] [2022-12-14 15:02:17,352 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2081419629] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:02:17,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [459734987] [2022-12-14 15:02:17,352 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:02:17,352 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:17,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:02:17,353 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:02:17,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-12-14 15:02:17,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:17,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 42 conjunts are in the unsatisfiable core [2022-12-14 15:02:17,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:02:17,636 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:02:17,636 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:02:17,765 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:02:17,766 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [459734987] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:02:17,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1153778273] [2022-12-14 15:02:17,767 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:02:17,767 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:02:17,767 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:02:17,767 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:02:17,767 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:02:18,101 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:02:20,216 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15428#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:02:20,216 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:02:20,217 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:02:20,217 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 30 [2022-12-14 15:02:20,217 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269995038] [2022-12-14 15:02:20,217 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:02:20,217 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-12-14 15:02:20,217 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:02:20,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-12-14 15:02:20,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=1438, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 15:02:20,218 INFO L87 Difference]: Start difference. First operand 131 states and 157 transitions. Second operand has 30 states, 30 states have (on average 1.4) internal successors, (42), 30 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:20,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:02:20,880 INFO L93 Difference]: Finished difference Result 175 states and 200 transitions. [2022-12-14 15:02:20,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 15:02:20,880 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.4) internal successors, (42), 30 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2022-12-14 15:02:20,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:02:20,881 INFO L225 Difference]: With dead ends: 175 [2022-12-14 15:02:20,881 INFO L226 Difference]: Without dead ends: 158 [2022-12-14 15:02:20,882 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 48 SyntacticMatches, 5 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 625 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=241, Invalid=2839, Unknown=0, NotChecked=0, Total=3080 [2022-12-14 15:02:20,882 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 83 mSDsluCounter, 307 mSDsCounter, 0 mSdLazyCounter, 780 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 781 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 780 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:02:20,882 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 326 Invalid, 781 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 780 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:02:20,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 158 states. [2022-12-14 15:02:20,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 158 to 125. [2022-12-14 15:02:20,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 124 states have (on average 1.2096774193548387) internal successors, (150), 124 states have internal predecessors, (150), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:20,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 150 transitions. [2022-12-14 15:02:20,963 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 150 transitions. Word has length 25 [2022-12-14 15:02:20,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:02:20,963 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 150 transitions. [2022-12-14 15:02:20,963 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.4) internal successors, (42), 30 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:20,963 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 150 transitions. [2022-12-14 15:02:20,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-12-14 15:02:20,963 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:02:20,963 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:02:20,967 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Ended with exit code 0 [2022-12-14 15:02:21,164 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2022-12-14 15:02:21,164 INFO L420 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:02:21,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:02:21,165 INFO L85 PathProgramCache]: Analyzing trace with hash -1035648438, now seen corresponding path program 29 times [2022-12-14 15:02:21,165 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:02:21,166 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [744188004] [2022-12-14 15:02:21,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:02:21,166 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:02:21,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:21,389 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:02:21,390 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:02:21,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [744188004] [2022-12-14 15:02:21,390 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [744188004] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:02:21,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [653707550] [2022-12-14 15:02:21,390 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:02:21,390 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:21,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:02:21,391 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:02:21,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2022-12-14 15:02:21,437 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 15:02:21,437 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:02:21,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 38 conjunts are in the unsatisfiable core [2022-12-14 15:02:21,440 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:02:21,611 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:02:21,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:02:21,742 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 14 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:02:21,742 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [653707550] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:02:21,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2059888999] [2022-12-14 15:02:21,743 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:02:21,743 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:02:21,743 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:02:21,743 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:02:21,743 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:02:22,085 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:02:23,868 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16215#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:02:23,868 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:02:23,868 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:02:23,868 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 29 [2022-12-14 15:02:23,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317541951] [2022-12-14 15:02:23,868 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:02:23,868 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2022-12-14 15:02:23,868 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:02:23,869 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2022-12-14 15:02:23,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1358, Unknown=0, NotChecked=0, Total=1482 [2022-12-14 15:02:23,869 INFO L87 Difference]: Start difference. First operand 125 states and 150 transitions. Second operand has 29 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 29 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:24,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:02:24,395 INFO L93 Difference]: Finished difference Result 155 states and 182 transitions. [2022-12-14 15:02:24,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2022-12-14 15:02:24,395 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 29 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2022-12-14 15:02:24,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:02:24,396 INFO L225 Difference]: With dead ends: 155 [2022-12-14 15:02:24,396 INFO L226 Difference]: Without dead ends: 151 [2022-12-14 15:02:24,396 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 43 SyntacticMatches, 9 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 566 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=240, Invalid=2516, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 15:02:24,397 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 60 mSDsluCounter, 194 mSDsCounter, 0 mSdLazyCounter, 441 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 442 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 441 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:02:24,397 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [60 Valid, 205 Invalid, 442 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 441 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:02:24,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2022-12-14 15:02:24,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 133. [2022-12-14 15:02:24,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.2121212121212122) internal successors, (160), 132 states have internal predecessors, (160), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:24,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 160 transitions. [2022-12-14 15:02:24,488 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 160 transitions. Word has length 25 [2022-12-14 15:02:24,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:02:24,488 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 160 transitions. [2022-12-14 15:02:24,488 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.4137931034482758) internal successors, (41), 29 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:24,488 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 160 transitions. [2022-12-14 15:02:24,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-12-14 15:02:24,489 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:02:24,489 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:02:24,493 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Ended with exit code 0 [2022-12-14 15:02:24,689 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:24,690 INFO L420 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:02:24,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:02:24,691 INFO L85 PathProgramCache]: Analyzing trace with hash 1242682852, now seen corresponding path program 30 times [2022-12-14 15:02:24,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:02:24,692 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375137552] [2022-12-14 15:02:24,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:02:24,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:02:24,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:24,855 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:02:24,856 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:02:24,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [375137552] [2022-12-14 15:02:24,856 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [375137552] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:02:24,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1760862539] [2022-12-14 15:02:24,856 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:02:24,856 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:24,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:02:24,857 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:02:24,857 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2022-12-14 15:02:24,895 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:02:24,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:02:24,896 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 15:02:24,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:02:25,155 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:02:25,156 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:02:25,347 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:02:25,347 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1760862539] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:02:25,347 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1736945031] [2022-12-14 15:02:25,348 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:02:25,348 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:02:25,348 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:02:25,348 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:02:25,348 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:02:25,728 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:02:28,215 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16989#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:02:28,215 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:02:28,215 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:02:28,215 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 34 [2022-12-14 15:02:28,215 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061507804] [2022-12-14 15:02:28,215 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:02:28,216 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-12-14 15:02:28,216 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:02:28,216 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-12-14 15:02:28,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1755, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 15:02:28,216 INFO L87 Difference]: Start difference. First operand 133 states and 160 transitions. Second operand has 34 states, 34 states have (on average 1.6764705882352942) internal successors, (57), 34 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 15:02:30,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:02:30,231 INFO L93 Difference]: Finished difference Result 235 states and 271 transitions. [2022-12-14 15:02:30,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-12-14 15:02:30,232 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.6764705882352942) internal successors, (57), 34 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 26 [2022-12-14 15:02:30,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:02:30,232 INFO L225 Difference]: With dead ends: 235 [2022-12-14 15:02:30,232 INFO L226 Difference]: Without dead ends: 211 [2022-12-14 15:02:30,233 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 43 SyntacticMatches, 6 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1036 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=1008, Invalid=4998, Unknown=0, NotChecked=0, Total=6006 [2022-12-14 15:02:30,233 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 759 mSDsluCounter, 278 mSDsCounter, 0 mSdLazyCounter, 498 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 759 SdHoareTripleChecker+Valid, 303 SdHoareTripleChecker+Invalid, 522 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 498 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:02:30,233 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [759 Valid, 303 Invalid, 522 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 498 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:02:30,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2022-12-14 15:02:30,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 146. [2022-12-14 15:02:30,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 145 states have (on average 1.2137931034482758) internal successors, (176), 145 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 15:02:30,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 176 transitions. [2022-12-14 15:02:30,353 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 176 transitions. Word has length 26 [2022-12-14 15:02:30,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:02:30,354 INFO L495 AbstractCegarLoop]: Abstraction has 146 states and 176 transitions. [2022-12-14 15:02:30,354 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.6764705882352942) internal successors, (57), 34 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 15:02:30,354 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 176 transitions. [2022-12-14 15:02:30,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-12-14 15:02:30,354 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:02:30,355 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:02:30,359 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2022-12-14 15:02:30,555 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2022-12-14 15:02:30,556 INFO L420 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:02:30,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:02:30,556 INFO L85 PathProgramCache]: Analyzing trace with hash 466529335, now seen corresponding path program 31 times [2022-12-14 15:02:30,557 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:02:30,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [274789417] [2022-12-14 15:02:30,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:02:30,557 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:02:30,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:30,746 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:02:30,746 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:02:30,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [274789417] [2022-12-14 15:02:30,746 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [274789417] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:02:30,746 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582181237] [2022-12-14 15:02:30,746 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:02:30,746 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:30,746 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:02:30,747 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:02:30,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2022-12-14 15:02:30,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:30,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 15:02:30,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:02:31,089 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:02:31,089 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:02:31,299 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:02:31,299 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1582181237] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:02:31,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1840727071] [2022-12-14 15:02:31,300 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:02:31,300 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:02:31,300 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:02:31,300 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:02:31,300 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:02:31,627 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:02:33,433 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17977#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:02:33,433 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:02:33,434 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:02:33,434 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 34 [2022-12-14 15:02:33,434 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355996421] [2022-12-14 15:02:33,434 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:02:33,434 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-12-14 15:02:33,434 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:02:33,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-12-14 15:02:33,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=1755, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 15:02:33,435 INFO L87 Difference]: Start difference. First operand 146 states and 176 transitions. Second operand has 34 states, 34 states have (on average 1.6764705882352942) internal successors, (57), 34 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 15:02:34,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:02:34,522 INFO L93 Difference]: Finished difference Result 225 states and 258 transitions. [2022-12-14 15:02:34,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2022-12-14 15:02:34,523 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.6764705882352942) internal successors, (57), 34 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 26 [2022-12-14 15:02:34,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:02:34,524 INFO L225 Difference]: With dead ends: 225 [2022-12-14 15:02:34,524 INFO L226 Difference]: Without dead ends: 214 [2022-12-14 15:02:34,524 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 43 SyntacticMatches, 6 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 516 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=306, Invalid=3116, Unknown=0, NotChecked=0, Total=3422 [2022-12-14 15:02:34,525 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 506 mSDsluCounter, 735 mSDsCounter, 0 mSdLazyCounter, 1063 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 506 SdHoareTripleChecker+Valid, 777 SdHoareTripleChecker+Invalid, 1085 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 1063 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 15:02:34,525 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [506 Valid, 777 Invalid, 1085 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 1063 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 15:02:34,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2022-12-14 15:02:34,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 149. [2022-12-14 15:02:34,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 149 states, 148 states have (on average 1.2094594594594594) internal successors, (179), 148 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 15:02:34,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 179 transitions. [2022-12-14 15:02:34,633 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 179 transitions. Word has length 26 [2022-12-14 15:02:34,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:02:34,633 INFO L495 AbstractCegarLoop]: Abstraction has 149 states and 179 transitions. [2022-12-14 15:02:34,633 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.6764705882352942) internal successors, (57), 34 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 15:02:34,633 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 179 transitions. [2022-12-14 15:02:34,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-12-14 15:02:34,634 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:02:34,634 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:02:34,638 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2022-12-14 15:02:34,834 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2022-12-14 15:02:34,835 INFO L420 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:02:34,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:02:34,836 INFO L85 PathProgramCache]: Analyzing trace with hash -780140226, now seen corresponding path program 32 times [2022-12-14 15:02:34,836 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:02:34,837 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [161486880] [2022-12-14 15:02:34,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:02:34,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:02:34,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:34,903 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 15:02:34,903 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:02:34,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [161486880] [2022-12-14 15:02:34,904 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [161486880] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:02:34,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [192936443] [2022-12-14 15:02:34,904 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:02:34,904 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:34,904 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:02:34,905 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:02:34,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2022-12-14 15:02:34,956 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 15:02:34,956 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:02:34,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 9 conjunts are in the unsatisfiable core [2022-12-14 15:02:34,958 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:02:35,013 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 15:02:35,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:02:35,054 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 15:02:35,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [192936443] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:02:35,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1504424538] [2022-12-14 15:02:35,055 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:02:35,056 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:02:35,056 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:02:35,056 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:02:35,056 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:02:35,413 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:02:37,010 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18895#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:02:37,010 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:02:37,010 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:02:37,010 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2022-12-14 15:02:37,010 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639280229] [2022-12-14 15:02:37,010 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:02:37,010 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-12-14 15:02:37,010 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:02:37,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-12-14 15:02:37,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=539, Unknown=0, NotChecked=0, Total=650 [2022-12-14 15:02:37,011 INFO L87 Difference]: Start difference. First operand 149 states and 179 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:37,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:02:37,346 INFO L93 Difference]: Finished difference Result 290 states and 351 transitions. [2022-12-14 15:02:37,346 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 15:02:37,347 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2022-12-14 15:02:37,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:02:37,347 INFO L225 Difference]: With dead ends: 290 [2022-12-14 15:02:37,347 INFO L226 Difference]: Without dead ends: 239 [2022-12-14 15:02:37,347 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 55 SyntacticMatches, 7 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=163, Invalid=767, Unknown=0, NotChecked=0, Total=930 [2022-12-14 15:02:37,348 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 141 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 163 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 141 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 163 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:02:37,348 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [141 Valid, 114 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 163 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:02:37,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2022-12-14 15:02:37,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 181. [2022-12-14 15:02:37,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 180 states have (on average 1.211111111111111) internal successors, (218), 180 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 15:02:37,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 218 transitions. [2022-12-14 15:02:37,479 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 218 transitions. Word has length 26 [2022-12-14 15:02:37,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:02:37,479 INFO L495 AbstractCegarLoop]: Abstraction has 181 states and 218 transitions. [2022-12-14 15:02:37,479 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:37,479 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 218 transitions. [2022-12-14 15:02:37,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-12-14 15:02:37,479 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:02:37,479 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:02:37,483 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Ended with exit code 0 [2022-12-14 15:02:37,680 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2022-12-14 15:02:37,680 INFO L420 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:02:37,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:02:37,681 INFO L85 PathProgramCache]: Analyzing trace with hash -2070124359, now seen corresponding path program 33 times [2022-12-14 15:02:37,681 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:02:37,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [69166327] [2022-12-14 15:02:37,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:02:37,682 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:02:37,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:37,774 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 15:02:37,775 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:02:37,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [69166327] [2022-12-14 15:02:37,775 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [69166327] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:02:37,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [203598569] [2022-12-14 15:02:37,775 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:02:37,775 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:37,775 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:02:37,776 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:02:37,777 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2022-12-14 15:02:37,826 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:02:37,826 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:02:37,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 9 conjunts are in the unsatisfiable core [2022-12-14 15:02:37,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:02:37,877 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 15:02:37,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:02:37,912 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2022-12-14 15:02:37,912 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [203598569] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:02:37,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [250208499] [2022-12-14 15:02:37,913 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:02:37,914 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:02:37,914 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:02:37,914 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:02:37,914 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:02:38,251 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:02:39,847 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19995#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:02:39,847 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:02:39,847 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:02:39,848 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 16 [2022-12-14 15:02:39,848 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741636780] [2022-12-14 15:02:39,848 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:02:39,848 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-12-14 15:02:39,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:02:39,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-12-14 15:02:39,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=527, Unknown=0, NotChecked=0, Total=650 [2022-12-14 15:02:39,849 INFO L87 Difference]: Start difference. First operand 181 states and 218 transitions. Second operand has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:40,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:02:40,214 INFO L93 Difference]: Finished difference Result 230 states and 273 transitions. [2022-12-14 15:02:40,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-12-14 15:02:40,214 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2022-12-14 15:02:40,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:02:40,214 INFO L225 Difference]: With dead ends: 230 [2022-12-14 15:02:40,214 INFO L226 Difference]: Without dead ends: 219 [2022-12-14 15:02:40,215 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 55 SyntacticMatches, 7 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=175, Invalid=755, Unknown=0, NotChecked=0, Total=930 [2022-12-14 15:02:40,215 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 55 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 96 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 15:02:40,215 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 96 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-12-14 15:02:40,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2022-12-14 15:02:40,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 202. [2022-12-14 15:02:40,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 201 states have (on average 1.2238805970149254) internal successors, (246), 201 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:40,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 246 transitions. [2022-12-14 15:02:40,363 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 246 transitions. Word has length 26 [2022-12-14 15:02:40,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:02:40,363 INFO L495 AbstractCegarLoop]: Abstraction has 202 states and 246 transitions. [2022-12-14 15:02:40,363 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.9375) internal successors, (31), 16 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:40,363 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 246 transitions. [2022-12-14 15:02:40,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-12-14 15:02:40,364 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:02:40,364 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:02:40,368 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Ended with exit code 0 [2022-12-14 15:02:40,564 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2022-12-14 15:02:40,564 INFO L420 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:02:40,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:02:40,564 INFO L85 PathProgramCache]: Analyzing trace with hash 2040355671, now seen corresponding path program 34 times [2022-12-14 15:02:40,565 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:02:40,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [148932412] [2022-12-14 15:02:40,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:02:40,565 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:02:40,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:40,823 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:02:40,823 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:02:40,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [148932412] [2022-12-14 15:02:40,823 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [148932412] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:02:40,823 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [833379230] [2022-12-14 15:02:40,823 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:02:40,823 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:40,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:02:40,824 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:02:40,825 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2022-12-14 15:02:40,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:40,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 50 conjunts are in the unsatisfiable core [2022-12-14 15:02:40,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:02:41,080 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:02:41,080 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:02:41,173 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:02:41,173 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [833379230] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:02:41,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1171084439] [2022-12-14 15:02:41,174 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:02:41,174 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:02:41,175 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:02:41,175 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:02:41,175 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:02:41,513 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:02:43,255 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '21042#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:02:43,255 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:02:43,255 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:02:43,256 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 35 [2022-12-14 15:02:43,256 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436984334] [2022-12-14 15:02:43,256 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:02:43,256 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 15:02:43,256 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:02:43,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 15:02:43,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=1850, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 15:02:43,257 INFO L87 Difference]: Start difference. First operand 202 states and 246 transitions. Second operand has 35 states, 35 states have (on average 1.3142857142857143) internal successors, (46), 35 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:44,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:02:44,434 INFO L93 Difference]: Finished difference Result 375 states and 429 transitions. [2022-12-14 15:02:44,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-12-14 15:02:44,435 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.3142857142857143) internal successors, (46), 35 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-12-14 15:02:44,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:02:44,436 INFO L225 Difference]: With dead ends: 375 [2022-12-14 15:02:44,436 INFO L226 Difference]: Without dead ends: 369 [2022-12-14 15:02:44,436 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 55 SyntacticMatches, 3 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 852 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=279, Invalid=4011, Unknown=0, NotChecked=0, Total=4290 [2022-12-14 15:02:44,437 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 148 mSDsluCounter, 600 mSDsCounter, 0 mSdLazyCounter, 1517 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 635 SdHoareTripleChecker+Invalid, 1518 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 15:02:44,437 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [148 Valid, 635 Invalid, 1518 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1517 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 15:02:44,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2022-12-14 15:02:44,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 208. [2022-12-14 15:02:44,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 208 states, 207 states have (on average 1.2222222222222223) internal successors, (253), 207 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 15:02:44,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 208 states to 208 states and 253 transitions. [2022-12-14 15:02:44,591 INFO L78 Accepts]: Start accepts. Automaton has 208 states and 253 transitions. Word has length 27 [2022-12-14 15:02:44,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:02:44,591 INFO L495 AbstractCegarLoop]: Abstraction has 208 states and 253 transitions. [2022-12-14 15:02:44,591 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.3142857142857143) internal successors, (46), 35 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:44,591 INFO L276 IsEmpty]: Start isEmpty. Operand 208 states and 253 transitions. [2022-12-14 15:02:44,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-12-14 15:02:44,592 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:02:44,592 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:02:44,596 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Ended with exit code 0 [2022-12-14 15:02:44,792 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:44,793 INFO L420 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:02:44,794 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:02:44,794 INFO L85 PathProgramCache]: Analyzing trace with hash -1956485763, now seen corresponding path program 35 times [2022-12-14 15:02:44,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:02:44,794 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [156000613] [2022-12-14 15:02:44,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:02:44,795 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:02:44,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:45,032 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:02:45,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:02:45,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [156000613] [2022-12-14 15:02:45,032 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [156000613] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:02:45,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1458077872] [2022-12-14 15:02:45,032 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:02:45,032 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:45,032 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:02:45,033 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:02:45,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2022-12-14 15:02:45,071 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 15:02:45,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:02:45,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 46 conjunts are in the unsatisfiable core [2022-12-14 15:02:45,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:02:45,296 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:02:45,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:02:45,407 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:02:45,407 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1458077872] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:02:45,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [921000098] [2022-12-14 15:02:45,408 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:02:45,408 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:02:45,408 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:02:45,408 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:02:45,408 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:02:45,795 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:02:47,692 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22405#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:02:47,693 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:02:47,693 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:02:47,693 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 33 [2022-12-14 15:02:47,693 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952908623] [2022-12-14 15:02:47,693 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:02:47,693 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2022-12-14 15:02:47,693 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:02:47,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2022-12-14 15:02:47,693 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1677, Unknown=0, NotChecked=0, Total=1806 [2022-12-14 15:02:47,694 INFO L87 Difference]: Start difference. First operand 208 states and 253 transitions. Second operand has 33 states, 33 states have (on average 1.3636363636363635) internal successors, (45), 33 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 15:02:48,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:02:48,739 INFO L93 Difference]: Finished difference Result 296 states and 340 transitions. [2022-12-14 15:02:48,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-12-14 15:02:48,739 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 1.3636363636363635) internal successors, (45), 33 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 27 [2022-12-14 15:02:48,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:02:48,740 INFO L225 Difference]: With dead ends: 296 [2022-12-14 15:02:48,740 INFO L226 Difference]: Without dead ends: 278 [2022-12-14 15:02:48,740 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 53 SyntacticMatches, 5 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 736 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=258, Invalid=3402, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 15:02:48,741 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 101 mSDsluCounter, 388 mSDsCounter, 0 mSdLazyCounter, 1004 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 101 SdHoareTripleChecker+Valid, 412 SdHoareTripleChecker+Invalid, 1005 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1004 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:02:48,741 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [101 Valid, 412 Invalid, 1005 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1004 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:02:48,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 278 states. [2022-12-14 15:02:48,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 278 to 202. [2022-12-14 15:02:48,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 202 states, 201 states have (on average 1.2238805970149254) internal successors, (246), 201 states have internal predecessors, (246), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:48,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 246 transitions. [2022-12-14 15:02:48,969 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 246 transitions. Word has length 27 [2022-12-14 15:02:48,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:02:48,969 INFO L495 AbstractCegarLoop]: Abstraction has 202 states and 246 transitions. [2022-12-14 15:02:48,969 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 1.3636363636363635) internal successors, (45), 33 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 15:02:48,969 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 246 transitions. [2022-12-14 15:02:48,969 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-12-14 15:02:48,969 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:02:48,969 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:02:48,974 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Ended with exit code 0 [2022-12-14 15:02:49,170 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:49,171 INFO L420 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:02:49,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:02:49,171 INFO L85 PathProgramCache]: Analyzing trace with hash -1132961976, now seen corresponding path program 36 times [2022-12-14 15:02:49,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:02:49,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475220876] [2022-12-14 15:02:49,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:02:49,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:02:49,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:49,289 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 13 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-12-14 15:02:49,289 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:02:49,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475220876] [2022-12-14 15:02:49,289 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [475220876] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:02:49,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [588940893] [2022-12-14 15:02:49,289 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:02:49,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:49,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:02:49,290 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:02:49,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2022-12-14 15:02:49,329 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:02:49,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:02:49,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 15:02:49,331 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:02:49,488 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-12-14 15:02:49,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:02:49,631 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-12-14 15:02:49,631 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [588940893] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:02:49,631 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1329460796] [2022-12-14 15:02:49,632 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:02:49,632 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:02:49,632 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:02:49,632 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:02:49,632 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:02:50,038 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:02:52,018 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '23596#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:02:52,018 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:02:52,018 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:02:52,019 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 25 [2022-12-14 15:02:52,019 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209573937] [2022-12-14 15:02:52,019 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:02:52,019 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 15:02:52,019 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:02:52,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 15:02:52,019 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1076, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 15:02:52,019 INFO L87 Difference]: Start difference. First operand 202 states and 246 transitions. Second operand has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:52,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:02:52,892 INFO L93 Difference]: Finished difference Result 290 states and 344 transitions. [2022-12-14 15:02:52,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 15:02:52,892 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-12-14 15:02:52,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:02:52,893 INFO L225 Difference]: With dead ends: 290 [2022-12-14 15:02:52,893 INFO L226 Difference]: Without dead ends: 252 [2022-12-14 15:02:52,893 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 54 SyntacticMatches, 4 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 449 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=448, Invalid=2308, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 15:02:52,894 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 343 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 276 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 343 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 276 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:02:52,894 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [343 Valid, 160 Invalid, 290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 276 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:02:52,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 252 states. [2022-12-14 15:02:53,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 252 to 218. [2022-12-14 15:02:53,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 218 states, 217 states have (on average 1.2027649769585254) internal successors, (261), 217 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 15:02:53,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 261 transitions. [2022-12-14 15:02:53,065 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 261 transitions. Word has length 27 [2022-12-14 15:02:53,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:02:53,065 INFO L495 AbstractCegarLoop]: Abstraction has 218 states and 261 transitions. [2022-12-14 15:02:53,065 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:53,066 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 261 transitions. [2022-12-14 15:02:53,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-12-14 15:02:53,066 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:02:53,066 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:02:53,070 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Ended with exit code 0 [2022-12-14 15:02:53,267 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:53,267 INFO L420 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:02:53,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:02:53,268 INFO L85 PathProgramCache]: Analyzing trace with hash 77898263, now seen corresponding path program 37 times [2022-12-14 15:02:53,268 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:02:53,268 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1858109255] [2022-12-14 15:02:53,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:02:53,269 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:02:53,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:53,506 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:02:53,506 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:02:53,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1858109255] [2022-12-14 15:02:53,506 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1858109255] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:02:53,506 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [747681117] [2022-12-14 15:02:53,506 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:02:53,506 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:53,507 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:02:53,507 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:02:53,508 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2022-12-14 15:02:53,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:53,548 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 42 conjunts are in the unsatisfiable core [2022-12-14 15:02:53,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:02:53,791 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:02:53,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:02:53,907 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:02:53,907 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [747681117] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:02:53,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [421844366] [2022-12-14 15:02:53,908 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:02:53,908 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:02:53,908 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:02:53,909 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:02:53,909 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:02:54,340 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:02:56,423 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24817#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:02:56,423 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:02:56,423 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:02:56,423 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 31 [2022-12-14 15:02:56,423 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801891042] [2022-12-14 15:02:56,423 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:02:56,423 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2022-12-14 15:02:56,423 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:02:56,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2022-12-14 15:02:56,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=1512, Unknown=0, NotChecked=0, Total=1640 [2022-12-14 15:02:56,424 INFO L87 Difference]: Start difference. First operand 218 states and 261 transitions. Second operand has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:57,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:02:57,374 INFO L93 Difference]: Finished difference Result 281 states and 327 transitions. [2022-12-14 15:02:57,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2022-12-14 15:02:57,374 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-12-14 15:02:57,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:02:57,375 INFO L225 Difference]: With dead ends: 281 [2022-12-14 15:02:57,375 INFO L226 Difference]: Without dead ends: 262 [2022-12-14 15:02:57,376 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 53 SyntacticMatches, 5 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 661 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=253, Invalid=2939, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 15:02:57,376 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 88 mSDsluCounter, 247 mSDsCounter, 0 mSdLazyCounter, 639 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 640 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 639 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:02:57,376 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 262 Invalid, 640 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 639 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:02:57,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2022-12-14 15:02:57,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 217. [2022-12-14 15:02:57,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 216 states have (on average 1.2083333333333333) internal successors, (261), 216 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 15:02:57,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 261 transitions. [2022-12-14 15:02:57,547 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 261 transitions. Word has length 27 [2022-12-14 15:02:57,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:02:57,547 INFO L495 AbstractCegarLoop]: Abstraction has 217 states and 261 transitions. [2022-12-14 15:02:57,547 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.3870967741935485) internal successors, (43), 31 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:02:57,547 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 261 transitions. [2022-12-14 15:02:57,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2022-12-14 15:02:57,547 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:02:57,547 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:02:57,552 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Ended with exit code 0 [2022-12-14 15:02:57,748 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:57,748 INFO L420 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:02:57,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:02:57,750 INFO L85 PathProgramCache]: Analyzing trace with hash -133295118, now seen corresponding path program 38 times [2022-12-14 15:02:57,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:02:57,750 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2075779100] [2022-12-14 15:02:57,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:02:57,751 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:02:57,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:02:57,905 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 17 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-12-14 15:02:57,905 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:02:57,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2075779100] [2022-12-14 15:02:57,905 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2075779100] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:02:57,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [74179051] [2022-12-14 15:02:57,905 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:02:57,905 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:02:57,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:02:57,906 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:02:57,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2022-12-14 15:02:57,947 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 15:02:57,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:02:57,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 18 conjunts are in the unsatisfiable core [2022-12-14 15:02:57,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:02:58,106 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-12-14 15:02:58,106 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:02:58,265 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 4 proven. 12 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-12-14 15:02:58,265 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [74179051] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:02:58,265 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2115464590] [2022-12-14 15:02:58,266 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:02:58,266 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:02:58,266 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:02:58,266 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:02:58,266 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:02:58,618 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:03:00,804 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '26008#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:03:00,804 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:03:00,804 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:03:00,804 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11, 11] total 25 [2022-12-14 15:03:00,804 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737274867] [2022-12-14 15:03:00,804 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:03:00,805 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 15:03:00,805 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:03:00,805 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 15:03:00,805 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1076, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 15:03:00,805 INFO L87 Difference]: Start difference. First operand 217 states and 261 transitions. Second operand has 25 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:01,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:03:01,513 INFO L93 Difference]: Finished difference Result 255 states and 296 transitions. [2022-12-14 15:03:01,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2022-12-14 15:03:01,513 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2022-12-14 15:03:01,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:03:01,514 INFO L225 Difference]: With dead ends: 255 [2022-12-14 15:03:01,514 INFO L226 Difference]: Without dead ends: 234 [2022-12-14 15:03:01,514 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 54 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=218, Invalid=1762, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 15:03:01,514 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 284 mSDsluCounter, 319 mSDsCounter, 0 mSdLazyCounter, 563 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 574 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 563 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:03:01,514 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [284 Valid, 347 Invalid, 574 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 563 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:03:01,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2022-12-14 15:03:01,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 217. [2022-12-14 15:03:01,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 216 states have (on average 1.1805555555555556) internal successors, (255), 216 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 15:03:01,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 255 transitions. [2022-12-14 15:03:01,698 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 255 transitions. Word has length 27 [2022-12-14 15:03:01,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:03:01,698 INFO L495 AbstractCegarLoop]: Abstraction has 217 states and 255 transitions. [2022-12-14 15:03:01,698 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:01,698 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 255 transitions. [2022-12-14 15:03:01,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-12-14 15:03:01,699 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:03:01,699 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:03:01,703 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Ended with exit code 0 [2022-12-14 15:03:01,899 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2022-12-14 15:03:01,900 INFO L420 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:03:01,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:03:01,901 INFO L85 PathProgramCache]: Analyzing trace with hash -710635465, now seen corresponding path program 39 times [2022-12-14 15:03:01,901 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:03:01,901 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1470562463] [2022-12-14 15:03:01,901 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:03:01,902 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:03:01,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:03:02,126 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:03:02,127 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:03:02,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1470562463] [2022-12-14 15:03:02,127 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1470562463] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:03:02,127 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [60265557] [2022-12-14 15:03:02,127 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:03:02,127 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:03:02,127 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:03:02,128 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:03:02,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2022-12-14 15:03:02,164 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:03:02,164 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:03:02,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 15:03:02,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:03:02,474 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:03:02,475 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:03:02,720 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:03:02,720 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [60265557] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:03:02,720 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [205370977] [2022-12-14 15:03:02,721 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:03:02,721 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:03:02,721 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:03:02,721 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:03:02,721 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:03:03,042 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:03:05,138 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '27155#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:03:05,138 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:03:05,138 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:03:05,138 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 39 [2022-12-14 15:03:05,138 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523339272] [2022-12-14 15:03:05,138 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:03:05,139 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-12-14 15:03:05,139 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:03:05,139 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-12-14 15:03:05,139 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=2201, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 15:03:05,139 INFO L87 Difference]: Start difference. First operand 217 states and 255 transitions. Second operand has 39 states, 39 states have (on average 1.5897435897435896) internal successors, (62), 39 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:07,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:03:07,526 INFO L93 Difference]: Finished difference Result 376 states and 426 transitions. [2022-12-14 15:03:07,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-12-14 15:03:07,527 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.5897435897435896) internal successors, (62), 39 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-12-14 15:03:07,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:03:07,527 INFO L225 Difference]: With dead ends: 376 [2022-12-14 15:03:07,527 INFO L226 Difference]: Without dead ends: 349 [2022-12-14 15:03:07,528 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 45 SyntacticMatches, 7 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1522 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=1464, Invalid=7092, Unknown=0, NotChecked=0, Total=8556 [2022-12-14 15:03:07,528 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 694 mSDsluCounter, 402 mSDsCounter, 0 mSdLazyCounter, 783 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 694 SdHoareTripleChecker+Valid, 431 SdHoareTripleChecker+Invalid, 811 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 783 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:03:07,528 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [694 Valid, 431 Invalid, 811 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 783 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:03:07,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 349 states. [2022-12-14 15:03:07,738 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 349 to 241. [2022-12-14 15:03:07,738 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 240 states have (on average 1.1791666666666667) internal successors, (283), 240 states have internal predecessors, (283), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:07,739 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 283 transitions. [2022-12-14 15:03:07,739 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 283 transitions. Word has length 28 [2022-12-14 15:03:07,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:03:07,739 INFO L495 AbstractCegarLoop]: Abstraction has 241 states and 283 transitions. [2022-12-14 15:03:07,739 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.5897435897435896) internal successors, (62), 39 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:07,739 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 283 transitions. [2022-12-14 15:03:07,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-12-14 15:03:07,739 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:03:07,739 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:03:07,744 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Ended with exit code 0 [2022-12-14 15:03:07,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2022-12-14 15:03:07,940 INFO L420 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:03:07,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:03:07,941 INFO L85 PathProgramCache]: Analyzing trace with hash 998409284, now seen corresponding path program 40 times [2022-12-14 15:03:07,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:03:07,942 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [674783108] [2022-12-14 15:03:07,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:03:07,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:03:07,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:03:08,198 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:03:08,198 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:03:08,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [674783108] [2022-12-14 15:03:08,198 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [674783108] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:03:08,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2060518420] [2022-12-14 15:03:08,198 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:03:08,199 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:03:08,199 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:03:08,199 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:03:08,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2022-12-14 15:03:08,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:03:08,245 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 15:03:08,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:03:08,530 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:03:08,530 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:03:08,794 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:03:08,794 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2060518420] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:03:08,795 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [795410653] [2022-12-14 15:03:08,795 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:03:08,795 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:03:08,796 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:03:08,796 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:03:08,796 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:03:09,131 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:03:11,078 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28648#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:03:11,078 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:03:11,078 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:03:11,078 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 39 [2022-12-14 15:03:11,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1819497025] [2022-12-14 15:03:11,078 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:03:11,078 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-12-14 15:03:11,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:03:11,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-12-14 15:03:11,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=2201, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 15:03:11,079 INFO L87 Difference]: Start difference. First operand 241 states and 283 transitions. Second operand has 39 states, 39 states have (on average 1.5897435897435896) internal successors, (62), 39 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:12,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:03:12,784 INFO L93 Difference]: Finished difference Result 365 states and 411 transitions. [2022-12-14 15:03:12,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 15:03:12,785 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.5897435897435896) internal successors, (62), 39 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-12-14 15:03:12,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:03:12,786 INFO L225 Difference]: With dead ends: 365 [2022-12-14 15:03:12,787 INFO L226 Difference]: Without dead ends: 353 [2022-12-14 15:03:12,787 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 45 SyntacticMatches, 7 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 666 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=372, Invalid=4050, Unknown=0, NotChecked=0, Total=4422 [2022-12-14 15:03:12,787 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 590 mSDsluCounter, 988 mSDsCounter, 0 mSdLazyCounter, 1409 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 590 SdHoareTripleChecker+Valid, 1037 SdHoareTripleChecker+Invalid, 1439 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 1409 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 15:03:12,787 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [590 Valid, 1037 Invalid, 1439 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 1409 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 15:03:12,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2022-12-14 15:03:13,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 245. [2022-12-14 15:03:13,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 245 states, 244 states have (on average 1.1762295081967213) internal successors, (287), 244 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 15:03:13,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 245 states to 245 states and 287 transitions. [2022-12-14 15:03:13,022 INFO L78 Accepts]: Start accepts. Automaton has 245 states and 287 transitions. Word has length 28 [2022-12-14 15:03:13,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:03:13,022 INFO L495 AbstractCegarLoop]: Abstraction has 245 states and 287 transitions. [2022-12-14 15:03:13,022 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.5897435897435896) internal successors, (62), 39 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:13,022 INFO L276 IsEmpty]: Start isEmpty. Operand 245 states and 287 transitions. [2022-12-14 15:03:13,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-12-14 15:03:13,022 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:03:13,023 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:03:13,027 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2022-12-14 15:03:13,223 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:03:13,224 INFO L420 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:03:13,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:03:13,225 INFO L85 PathProgramCache]: Analyzing trace with hash 1613373747, now seen corresponding path program 41 times [2022-12-14 15:03:13,225 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:03:13,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1032822178] [2022-12-14 15:03:13,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:03:13,226 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:03:13,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:03:13,318 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 15:03:13,318 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:03:13,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1032822178] [2022-12-14 15:03:13,318 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1032822178] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:03:13,318 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2144128402] [2022-12-14 15:03:13,318 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:03:13,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:03:13,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:03:13,319 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:03:13,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2022-12-14 15:03:13,363 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 15:03:13,363 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:03:13,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 15:03:13,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:03:13,413 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 15:03:13,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:03:13,452 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 15:03:13,452 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2144128402] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:03:13,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1668244233] [2022-12-14 15:03:13,453 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:03:13,453 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:03:13,453 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:03:13,453 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:03:13,453 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:03:13,789 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:03:15,578 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '30053#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:03:15,578 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:03:15,578 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:03:15,578 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2022-12-14 15:03:15,578 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726545513] [2022-12-14 15:03:15,578 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:03:15,579 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 15:03:15,579 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:03:15,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 15:03:15,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=556, Unknown=0, NotChecked=0, Total=702 [2022-12-14 15:03:15,579 INFO L87 Difference]: Start difference. First operand 245 states and 287 transitions. Second operand has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:15,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:03:15,982 INFO L93 Difference]: Finished difference Result 270 states and 309 transitions. [2022-12-14 15:03:15,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-12-14 15:03:15,983 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-12-14 15:03:15,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:03:15,984 INFO L225 Difference]: With dead ends: 270 [2022-12-14 15:03:15,984 INFO L226 Difference]: Without dead ends: 266 [2022-12-14 15:03:15,984 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 60 SyntacticMatches, 8 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 429 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=228, Invalid=828, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 15:03:15,984 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 47 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 122 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 126 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 122 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:03:15,984 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 86 Invalid, 126 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 122 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:03:15,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2022-12-14 15:03:16,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 230. [2022-12-14 15:03:16,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 229 states have (on average 1.1703056768558953) internal successors, (268), 229 states have internal predecessors, (268), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:16,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 268 transitions. [2022-12-14 15:03:16,210 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 268 transitions. Word has length 28 [2022-12-14 15:03:16,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:03:16,210 INFO L495 AbstractCegarLoop]: Abstraction has 230 states and 268 transitions. [2022-12-14 15:03:16,210 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:16,210 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 268 transitions. [2022-12-14 15:03:16,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2022-12-14 15:03:16,211 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:03:16,211 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:03:16,215 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Ended with exit code 0 [2022-12-14 15:03:16,411 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2022-12-14 15:03:16,412 INFO L420 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:03:16,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:03:16,413 INFO L85 PathProgramCache]: Analyzing trace with hash 1739367188, now seen corresponding path program 42 times [2022-12-14 15:03:16,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:03:16,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944958200] [2022-12-14 15:03:16,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:03:16,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:03:16,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:03:16,520 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 15:03:16,520 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:03:16,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944958200] [2022-12-14 15:03:16,520 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944958200] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:03:16,520 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [946657787] [2022-12-14 15:03:16,520 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:03:16,520 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:03:16,521 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:03:16,521 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:03:16,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2022-12-14 15:03:16,566 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:03:16,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:03:16,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 10 conjunts are in the unsatisfiable core [2022-12-14 15:03:16,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:03:16,625 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 15:03:16,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:03:16,675 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 15:03:16,676 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [946657787] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:03:16,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1531682197] [2022-12-14 15:03:16,677 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:03:16,677 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:03:16,677 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:03:16,677 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:03:16,677 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:03:17,031 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:03:18,450 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31226#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:03:18,451 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:03:18,451 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:03:18,451 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2022-12-14 15:03:18,451 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553949806] [2022-12-14 15:03:18,451 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:03:18,451 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2022-12-14 15:03:18,451 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:03:18,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2022-12-14 15:03:18,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=553, Unknown=0, NotChecked=0, Total=702 [2022-12-14 15:03:18,452 INFO L87 Difference]: Start difference. First operand 230 states and 268 transitions. Second operand has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:18,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:03:18,910 INFO L93 Difference]: Finished difference Result 313 states and 363 transitions. [2022-12-14 15:03:18,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-12-14 15:03:18,911 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2022-12-14 15:03:18,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:03:18,912 INFO L225 Difference]: With dead ends: 313 [2022-12-14 15:03:18,912 INFO L226 Difference]: Without dead ends: 254 [2022-12-14 15:03:18,912 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 60 SyntacticMatches, 8 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 426 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=231, Invalid=825, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 15:03:18,913 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 67 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 173 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:03:18,913 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [67 Valid, 147 Invalid, 173 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:03:18,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 254 states. [2022-12-14 15:03:19,123 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 254 to 237. [2022-12-14 15:03:19,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 236 states have (on average 1.1652542372881356) internal successors, (275), 236 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 15:03:19,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 275 transitions. [2022-12-14 15:03:19,124 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 275 transitions. Word has length 28 [2022-12-14 15:03:19,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:03:19,124 INFO L495 AbstractCegarLoop]: Abstraction has 237 states and 275 transitions. [2022-12-14 15:03:19,124 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:19,124 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 275 transitions. [2022-12-14 15:03:19,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-12-14 15:03:19,124 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:03:19,125 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:03:19,129 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2022-12-14 15:03:19,325 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2022-12-14 15:03:19,326 INFO L420 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:03:19,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:03:19,327 INFO L85 PathProgramCache]: Analyzing trace with hash 1348764906, now seen corresponding path program 43 times [2022-12-14 15:03:19,327 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:03:19,327 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687512746] [2022-12-14 15:03:19,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:03:19,328 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:03:19,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:03:19,678 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:03:19,679 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:03:19,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687512746] [2022-12-14 15:03:19,679 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1687512746] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:03:19,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [551045147] [2022-12-14 15:03:19,679 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:03:19,679 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:03:19,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:03:19,680 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:03:19,681 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2022-12-14 15:03:19,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:03:19,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 54 conjunts are in the unsatisfiable core [2022-12-14 15:03:19,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:03:19,958 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:03:19,958 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:03:20,087 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:03:20,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [551045147] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:03:20,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1593997853] [2022-12-14 15:03:20,088 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:03:20,088 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:03:20,088 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:03:20,088 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:03:20,088 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:03:20,516 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:03:22,619 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '32526#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:03:22,619 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:03:22,619 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:03:22,619 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 38 [2022-12-14 15:03:22,620 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124353483] [2022-12-14 15:03:22,620 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:03:22,620 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-12-14 15:03:22,620 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:03:22,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-12-14 15:03:22,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=2119, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 15:03:22,621 INFO L87 Difference]: Start difference. First operand 237 states and 275 transitions. Second operand has 38 states, 38 states have (on average 1.2894736842105263) internal successors, (49), 38 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 15:03:24,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:03:24,351 INFO L93 Difference]: Finished difference Result 438 states and 485 transitions. [2022-12-14 15:03:24,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-12-14 15:03:24,352 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.2894736842105263) internal successors, (49), 38 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2022-12-14 15:03:24,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:03:24,353 INFO L225 Difference]: With dead ends: 438 [2022-12-14 15:03:24,353 INFO L226 Difference]: Without dead ends: 432 [2022-12-14 15:03:24,353 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 60 SyntacticMatches, 3 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 981 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=297, Invalid=4673, Unknown=0, NotChecked=0, Total=4970 [2022-12-14 15:03:24,353 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 159 mSDsluCounter, 793 mSDsCounter, 0 mSdLazyCounter, 1990 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 834 SdHoareTripleChecker+Invalid, 1991 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1990 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 15:03:24,353 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 834 Invalid, 1991 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1990 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 15:03:24,354 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2022-12-14 15:03:24,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 243. [2022-12-14 15:03:24,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 243 states, 242 states have (on average 1.165289256198347) internal successors, (282), 242 states have internal predecessors, (282), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:24,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 243 states to 243 states and 282 transitions. [2022-12-14 15:03:24,718 INFO L78 Accepts]: Start accepts. Automaton has 243 states and 282 transitions. Word has length 29 [2022-12-14 15:03:24,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:03:24,718 INFO L495 AbstractCegarLoop]: Abstraction has 243 states and 282 transitions. [2022-12-14 15:03:24,718 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.2894736842105263) internal successors, (49), 38 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 15:03:24,718 INFO L276 IsEmpty]: Start isEmpty. Operand 243 states and 282 transitions. [2022-12-14 15:03:24,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-12-14 15:03:24,719 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:03:24,719 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:03:24,723 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2022-12-14 15:03:24,920 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2022-12-14 15:03:24,920 INFO L420 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:03:24,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:03:24,921 INFO L85 PathProgramCache]: Analyzing trace with hash 1064273200, now seen corresponding path program 44 times [2022-12-14 15:03:24,922 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:03:24,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [231281547] [2022-12-14 15:03:24,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:03:24,923 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:03:24,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:03:25,187 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:03:25,188 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:03:25,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [231281547] [2022-12-14 15:03:25,188 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [231281547] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:03:25,188 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1343365849] [2022-12-14 15:03:25,188 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:03:25,188 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:03:25,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:03:25,189 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:03:25,190 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2022-12-14 15:03:25,232 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 15:03:25,232 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:03:25,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 50 conjunts are in the unsatisfiable core [2022-12-14 15:03:25,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:03:25,528 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:03:25,528 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:03:25,664 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:03:25,664 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1343365849] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:03:25,664 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1213661488] [2022-12-14 15:03:25,665 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:03:25,665 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:03:25,665 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:03:25,665 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:03:25,665 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:03:26,015 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:03:28,146 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '34100#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:03:28,146 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:03:28,146 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:03:28,146 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 36 [2022-12-14 15:03:28,146 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075120591] [2022-12-14 15:03:28,147 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:03:28,147 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-12-14 15:03:28,147 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:03:28,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-12-14 15:03:28,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=1934, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 15:03:28,148 INFO L87 Difference]: Start difference. First operand 243 states and 282 transitions. Second operand has 36 states, 36 states have (on average 1.3333333333333333) internal successors, (48), 36 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:29,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:03:29,809 INFO L93 Difference]: Finished difference Result 348 states and 386 transitions. [2022-12-14 15:03:29,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-12-14 15:03:29,810 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.3333333333333333) internal successors, (48), 36 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2022-12-14 15:03:29,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:03:29,811 INFO L225 Difference]: With dead ends: 348 [2022-12-14 15:03:29,811 INFO L226 Difference]: Without dead ends: 329 [2022-12-14 15:03:29,812 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 58 SyntacticMatches, 5 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 856 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=275, Invalid=4015, Unknown=0, NotChecked=0, Total=4290 [2022-12-14 15:03:29,812 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 120 mSDsluCounter, 537 mSDsCounter, 0 mSdLazyCounter, 1365 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 120 SdHoareTripleChecker+Valid, 568 SdHoareTripleChecker+Invalid, 1366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 15:03:29,812 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [120 Valid, 568 Invalid, 1366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1365 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 15:03:29,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2022-12-14 15:03:30,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 237. [2022-12-14 15:03:30,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 236 states have (on average 1.1652542372881356) internal successors, (275), 236 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 15:03:30,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 275 transitions. [2022-12-14 15:03:30,060 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 275 transitions. Word has length 29 [2022-12-14 15:03:30,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:03:30,060 INFO L495 AbstractCegarLoop]: Abstraction has 237 states and 275 transitions. [2022-12-14 15:03:30,060 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.3333333333333333) internal successors, (48), 36 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:30,060 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 275 transitions. [2022-12-14 15:03:30,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-12-14 15:03:30,061 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:03:30,061 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:03:30,065 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Ended with exit code 0 [2022-12-14 15:03:30,261 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2022-12-14 15:03:30,261 INFO L420 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:03:30,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:03:30,262 INFO L85 PathProgramCache]: Analyzing trace with hash -1928611030, now seen corresponding path program 45 times [2022-12-14 15:03:30,262 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:03:30,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1249167549] [2022-12-14 15:03:30,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:03:30,263 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:03:30,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:03:30,503 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:03:30,503 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:03:30,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1249167549] [2022-12-14 15:03:30,503 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1249167549] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:03:30,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [986047649] [2022-12-14 15:03:30,503 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:03:30,503 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:03:30,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:03:30,504 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:03:30,505 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2022-12-14 15:03:30,541 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:03:30,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:03:30,542 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 46 conjunts are in the unsatisfiable core [2022-12-14 15:03:30,543 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:03:30,829 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:03:30,829 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:03:30,958 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:03:30,958 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [986047649] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:03:30,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [90818631] [2022-12-14 15:03:30,959 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:03:30,959 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:03:30,959 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:03:30,959 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:03:30,959 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:03:31,280 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:03:33,223 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35486#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:03:33,223 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:03:33,223 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:03:33,223 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 34 [2022-12-14 15:03:33,223 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398642658] [2022-12-14 15:03:33,223 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:03:33,224 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2022-12-14 15:03:33,224 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:03:33,224 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2022-12-14 15:03:33,224 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1757, Unknown=0, NotChecked=0, Total=1892 [2022-12-14 15:03:33,224 INFO L87 Difference]: Start difference. First operand 237 states and 275 transitions. Second operand has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:34,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:03:34,207 INFO L93 Difference]: Finished difference Result 285 states and 322 transitions. [2022-12-14 15:03:34,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 15:03:34,208 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2022-12-14 15:03:34,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:03:34,209 INFO L225 Difference]: With dead ends: 285 [2022-12-14 15:03:34,209 INFO L226 Difference]: Without dead ends: 265 [2022-12-14 15:03:34,209 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 58 SyntacticMatches, 5 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 775 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=270, Invalid=3512, Unknown=0, NotChecked=0, Total=3782 [2022-12-14 15:03:34,209 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 84 mSDsluCounter, 373 mSDsCounter, 0 mSdLazyCounter, 1005 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 392 SdHoareTripleChecker+Invalid, 1006 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1005 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:03:34,209 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 392 Invalid, 1006 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1005 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:03:34,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2022-12-14 15:03:34,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 229. [2022-12-14 15:03:34,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 228 states have (on average 1.1666666666666667) internal successors, (266), 228 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:34,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 266 transitions. [2022-12-14 15:03:34,422 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 266 transitions. Word has length 29 [2022-12-14 15:03:34,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:03:34,422 INFO L495 AbstractCegarLoop]: Abstraction has 229 states and 266 transitions. [2022-12-14 15:03:34,422 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.3529411764705883) internal successors, (46), 34 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:34,422 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 266 transitions. [2022-12-14 15:03:34,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2022-12-14 15:03:34,422 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:03:34,422 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:03:34,427 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Ended with exit code 0 [2022-12-14 15:03:34,623 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:03:34,623 INFO L420 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:03:34,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:03:34,624 INFO L85 PathProgramCache]: Analyzing trace with hash -1554815248, now seen corresponding path program 46 times [2022-12-14 15:03:34,624 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:03:34,625 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607396571] [2022-12-14 15:03:34,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:03:34,625 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:03:34,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:03:34,847 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:03:34,848 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:03:34,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607396571] [2022-12-14 15:03:34,848 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [607396571] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:03:34,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [709538497] [2022-12-14 15:03:34,848 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:03:34,848 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:03:34,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:03:34,849 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:03:34,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2022-12-14 15:03:34,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:03:34,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 42 conjunts are in the unsatisfiable core [2022-12-14 15:03:34,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:03:35,129 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:03:35,129 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:03:35,251 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 22 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:03:35,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [709538497] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:03:35,251 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1650736524] [2022-12-14 15:03:35,252 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:03:35,252 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:03:35,252 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:03:35,253 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:03:35,253 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:03:35,583 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:03:37,803 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '36732#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:03:37,803 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:03:37,803 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:03:37,804 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 32 [2022-12-14 15:03:37,804 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1571246846] [2022-12-14 15:03:37,804 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:03:37,804 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2022-12-14 15:03:37,804 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:03:37,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2022-12-14 15:03:37,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=1588, Unknown=0, NotChecked=0, Total=1722 [2022-12-14 15:03:37,804 INFO L87 Difference]: Start difference. First operand 229 states and 266 transitions. Second operand has 32 states, 32 states have (on average 1.375) internal successors, (44), 32 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:38,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:03:38,583 INFO L93 Difference]: Finished difference Result 262 states and 301 transitions. [2022-12-14 15:03:38,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 15:03:38,584 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.375) internal successors, (44), 32 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2022-12-14 15:03:38,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:03:38,585 INFO L225 Difference]: With dead ends: 262 [2022-12-14 15:03:38,585 INFO L226 Difference]: Without dead ends: 258 [2022-12-14 15:03:38,585 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 58 SyntacticMatches, 5 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 699 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=265, Invalid=3041, Unknown=0, NotChecked=0, Total=3306 [2022-12-14 15:03:38,586 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 64 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 530 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 531 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 530 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:03:38,586 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [64 Valid, 223 Invalid, 531 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 530 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:03:38,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2022-12-14 15:03:38,816 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 238. [2022-12-14 15:03:38,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 238 states, 237 states have (on average 1.1687763713080168) internal successors, (277), 237 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 15:03:38,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 277 transitions. [2022-12-14 15:03:38,816 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 277 transitions. Word has length 29 [2022-12-14 15:03:38,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:03:38,817 INFO L495 AbstractCegarLoop]: Abstraction has 238 states and 277 transitions. [2022-12-14 15:03:38,817 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.375) internal successors, (44), 32 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:38,817 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 277 transitions. [2022-12-14 15:03:38,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-12-14 15:03:38,817 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:03:38,817 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:03:38,821 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Ended with exit code 0 [2022-12-14 15:03:39,017 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2022-12-14 15:03:39,018 INFO L420 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:03:39,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:03:39,019 INFO L85 PathProgramCache]: Analyzing trace with hash -675112700, now seen corresponding path program 47 times [2022-12-14 15:03:39,019 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:03:39,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [358206083] [2022-12-14 15:03:39,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:03:39,020 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:03:39,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:03:39,243 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:03:39,244 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:03:39,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [358206083] [2022-12-14 15:03:39,244 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [358206083] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:03:39,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2128888392] [2022-12-14 15:03:39,244 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:03:39,244 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:03:39,244 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:03:39,245 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:03:39,246 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2022-12-14 15:03:39,293 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 15:03:39,293 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:03:39,294 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 15:03:39,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:03:39,666 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:03:39,666 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:03:40,061 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:03:40,061 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2128888392] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:03:40,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1013799044] [2022-12-14 15:03:40,061 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:03:40,062 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:03:40,062 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:03:40,062 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:03:40,062 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:03:40,404 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:03:42,333 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37968#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:03:42,333 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:03:42,333 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:03:42,333 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 44 [2022-12-14 15:03:42,333 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1192802547] [2022-12-14 15:03:42,333 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:03:42,333 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-12-14 15:03:42,334 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:03:42,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-12-14 15:03:42,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=2697, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 15:03:42,334 INFO L87 Difference]: Start difference. First operand 238 states and 277 transitions. Second operand has 44 states, 44 states have (on average 1.5227272727272727) internal successors, (67), 44 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:45,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:03:45,976 INFO L93 Difference]: Finished difference Result 423 states and 474 transitions. [2022-12-14 15:03:45,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2022-12-14 15:03:45,977 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.5227272727272727) internal successors, (67), 44 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-12-14 15:03:45,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:03:45,978 INFO L225 Difference]: With dead ends: 423 [2022-12-14 15:03:45,978 INFO L226 Difference]: Without dead ends: 394 [2022-12-14 15:03:45,978 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 47 SyntacticMatches, 8 SemanticMatches, 107 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2171 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=2046, Invalid=9726, Unknown=0, NotChecked=0, Total=11772 [2022-12-14 15:03:45,978 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 962 mSDsluCounter, 529 mSDsCounter, 0 mSdLazyCounter, 1020 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 962 SdHoareTripleChecker+Valid, 562 SdHoareTripleChecker+Invalid, 1057 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 1020 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 15:03:45,979 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [962 Valid, 562 Invalid, 1057 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 1020 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 15:03:45,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2022-12-14 15:03:46,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 263. [2022-12-14 15:03:46,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 262 states have (on average 1.16793893129771) internal successors, (306), 262 states have internal predecessors, (306), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:46,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 306 transitions. [2022-12-14 15:03:46,237 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 306 transitions. Word has length 30 [2022-12-14 15:03:46,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:03:46,237 INFO L495 AbstractCegarLoop]: Abstraction has 263 states and 306 transitions. [2022-12-14 15:03:46,237 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.5227272727272727) internal successors, (67), 44 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:46,237 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 306 transitions. [2022-12-14 15:03:46,237 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-12-14 15:03:46,237 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:03:46,238 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:03:46,242 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Ended with exit code 0 [2022-12-14 15:03:46,438 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:03:46,439 INFO L420 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:03:46,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:03:46,439 INFO L85 PathProgramCache]: Analyzing trace with hash 765666967, now seen corresponding path program 48 times [2022-12-14 15:03:46,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:03:46,440 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1290607093] [2022-12-14 15:03:46,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:03:46,441 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:03:46,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:03:46,706 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:03:46,707 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:03:46,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1290607093] [2022-12-14 15:03:46,707 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1290607093] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:03:46,707 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [562549754] [2022-12-14 15:03:46,707 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:03:46,707 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:03:46,707 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:03:46,708 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:03:46,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2022-12-14 15:03:46,744 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:03:46,744 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:03:46,745 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 26 conjunts are in the unsatisfiable core [2022-12-14 15:03:46,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:03:47,218 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:03:47,218 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:03:47,604 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 8 proven. 56 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:03:47,604 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [562549754] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:03:47,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1613748247] [2022-12-14 15:03:47,605 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:03:47,605 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:03:47,605 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:03:47,605 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:03:47,605 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:03:47,951 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:03:50,098 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '39634#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:03:50,098 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:03:50,098 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:03:50,098 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 44 [2022-12-14 15:03:50,098 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249069152] [2022-12-14 15:03:50,098 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:03:50,099 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-12-14 15:03:50,099 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:03:50,099 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-12-14 15:03:50,099 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=2697, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 15:03:50,099 INFO L87 Difference]: Start difference. First operand 263 states and 306 transitions. Second operand has 44 states, 44 states have (on average 1.5227272727272727) internal successors, (67), 44 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:52,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:03:52,322 INFO L93 Difference]: Finished difference Result 411 states and 458 transitions. [2022-12-14 15:03:52,323 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-12-14 15:03:52,323 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.5227272727272727) internal successors, (67), 44 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-12-14 15:03:52,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:03:52,324 INFO L225 Difference]: With dead ends: 411 [2022-12-14 15:03:52,324 INFO L226 Difference]: Without dead ends: 398 [2022-12-14 15:03:52,324 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 47 SyntacticMatches, 8 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 835 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=444, Invalid=5106, Unknown=0, NotChecked=0, Total=5550 [2022-12-14 15:03:52,325 INFO L413 NwaCegarLoop]: 56 mSDtfsCounter, 861 mSDsluCounter, 1284 mSDsCounter, 0 mSdLazyCounter, 1737 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 861 SdHoareTripleChecker+Valid, 1340 SdHoareTripleChecker+Invalid, 1777 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 1737 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 15:03:52,325 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [861 Valid, 1340 Invalid, 1777 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 1737 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 15:03:52,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2022-12-14 15:03:52,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 267. [2022-12-14 15:03:52,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 266 states have (on average 1.1654135338345866) internal successors, (310), 266 states have internal predecessors, (310), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:52,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 310 transitions. [2022-12-14 15:03:52,604 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 310 transitions. Word has length 30 [2022-12-14 15:03:52,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:03:52,604 INFO L495 AbstractCegarLoop]: Abstraction has 267 states and 310 transitions. [2022-12-14 15:03:52,604 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.5227272727272727) internal successors, (67), 44 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:52,604 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 310 transitions. [2022-12-14 15:03:52,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-12-14 15:03:52,605 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:03:52,605 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:03:52,609 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Ended with exit code 0 [2022-12-14 15:03:52,805 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:03:52,806 INFO L420 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:03:52,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:03:52,807 INFO L85 PathProgramCache]: Analyzing trace with hash -595255660, now seen corresponding path program 49 times [2022-12-14 15:03:52,808 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:03:52,808 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583933418] [2022-12-14 15:03:52,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:03:52,809 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:03:52,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:03:52,909 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 15:03:52,909 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:03:52,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583933418] [2022-12-14 15:03:52,909 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1583933418] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:03:52,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [591253509] [2022-12-14 15:03:52,910 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:03:52,910 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:03:52,910 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:03:52,910 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:03:52,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2022-12-14 15:03:52,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:03:52,958 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 11 conjunts are in the unsatisfiable core [2022-12-14 15:03:52,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:03:53,005 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 15:03:53,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:03:53,054 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 15:03:53,055 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [591253509] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:03:53,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [680436214] [2022-12-14 15:03:53,056 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:03:53,056 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:03:53,056 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:03:53,056 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:03:53,056 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:03:53,397 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:03:54,966 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '41191#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:03:54,966 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:03:54,966 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:03:54,966 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2022-12-14 15:03:54,966 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243255474] [2022-12-14 15:03:54,966 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:03:54,966 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 15:03:54,966 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:03:54,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 15:03:54,966 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=676, Unknown=0, NotChecked=0, Total=812 [2022-12-14 15:03:54,967 INFO L87 Difference]: Start difference. First operand 267 states and 310 transitions. Second operand has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 19 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:55,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:03:55,657 INFO L93 Difference]: Finished difference Result 477 states and 560 transitions. [2022-12-14 15:03:55,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 15:03:55,657 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 19 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-12-14 15:03:55,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:03:55,658 INFO L225 Difference]: With dead ends: 477 [2022-12-14 15:03:55,658 INFO L226 Difference]: Without dead ends: 403 [2022-12-14 15:03:55,658 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 64 SyntacticMatches, 9 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 475 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=248, Invalid=1158, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 15:03:55,659 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 233 mSDsluCounter, 140 mSDsCounter, 0 mSdLazyCounter, 244 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 233 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 250 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:03:55,659 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [233 Valid, 166 Invalid, 250 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 244 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:03:55,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2022-12-14 15:03:55,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 317. [2022-12-14 15:03:55,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 317 states, 316 states have (on average 1.1677215189873418) internal successors, (369), 316 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 15:03:55,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 369 transitions. [2022-12-14 15:03:55,985 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 369 transitions. Word has length 30 [2022-12-14 15:03:55,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:03:55,986 INFO L495 AbstractCegarLoop]: Abstraction has 317 states and 369 transitions. [2022-12-14 15:03:55,986 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 19 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:55,986 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 369 transitions. [2022-12-14 15:03:55,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2022-12-14 15:03:55,986 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:03:55,986 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:03:55,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2022-12-14 15:03:56,187 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2022-12-14 15:03:56,187 INFO L420 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:03:56,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:03:56,187 INFO L85 PathProgramCache]: Analyzing trace with hash -984426285, now seen corresponding path program 50 times [2022-12-14 15:03:56,188 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:03:56,188 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700010821] [2022-12-14 15:03:56,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:03:56,188 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:03:56,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:03:56,276 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 15:03:56,276 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:03:56,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700010821] [2022-12-14 15:03:56,276 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1700010821] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:03:56,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2109764474] [2022-12-14 15:03:56,276 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:03:56,276 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:03:56,277 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:03:56,277 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:03:56,278 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2022-12-14 15:03:56,317 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 15:03:56,317 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:03:56,318 INFO L263 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 11 conjunts are in the unsatisfiable core [2022-12-14 15:03:56,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:03:56,382 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 15:03:56,383 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:03:56,431 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-12-14 15:03:56,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2109764474] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:03:56,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1695154854] [2022-12-14 15:03:56,431 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:03:56,432 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:03:56,432 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:03:56,432 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:03:56,432 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:03:56,926 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:03:58,633 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42968#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:03:58,633 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:03:58,634 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:03:58,634 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2022-12-14 15:03:58,634 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117488172] [2022-12-14 15:03:58,634 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:03:58,634 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2022-12-14 15:03:58,634 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:03:58,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2022-12-14 15:03:58,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=661, Unknown=0, NotChecked=0, Total=812 [2022-12-14 15:03:58,635 INFO L87 Difference]: Start difference. First operand 317 states and 369 transitions. Second operand has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 19 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:59,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:03:59,308 INFO L93 Difference]: Finished difference Result 381 states and 440 transitions. [2022-12-14 15:03:59,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 15:03:59,309 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 19 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 30 [2022-12-14 15:03:59,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:03:59,311 INFO L225 Difference]: With dead ends: 381 [2022-12-14 15:03:59,311 INFO L226 Difference]: Without dead ends: 369 [2022-12-14 15:03:59,311 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 64 SyntacticMatches, 9 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 482 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=263, Invalid=1143, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 15:03:59,312 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 90 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:03:59,312 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 110 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:03:59,312 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 369 states. [2022-12-14 15:03:59,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 369 to 344. [2022-12-14 15:03:59,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 343 states have (on average 1.1807580174927115) internal successors, (405), 343 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 15:03:59,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 405 transitions. [2022-12-14 15:03:59,668 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 405 transitions. Word has length 30 [2022-12-14 15:03:59,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:03:59,668 INFO L495 AbstractCegarLoop]: Abstraction has 344 states and 405 transitions. [2022-12-14 15:03:59,669 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.7894736842105263) internal successors, (34), 19 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:03:59,669 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 405 transitions. [2022-12-14 15:03:59,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-12-14 15:03:59,669 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:03:59,669 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:03:59,673 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2022-12-14 15:03:59,870 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2022-12-14 15:03:59,870 INFO L420 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:03:59,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:03:59,871 INFO L85 PathProgramCache]: Analyzing trace with hash -1571279625, now seen corresponding path program 51 times [2022-12-14 15:03:59,871 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:03:59,872 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [561613716] [2022-12-14 15:03:59,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:03:59,872 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:03:59,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:00,233 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 74 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:04:00,233 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:00,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [561613716] [2022-12-14 15:04:00,234 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [561613716] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:04:00,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1455196176] [2022-12-14 15:04:00,234 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:04:00,234 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:00,234 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:00,235 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:04:00,236 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2022-12-14 15:04:00,271 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:04:00,271 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:04:00,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 58 conjunts are in the unsatisfiable core [2022-12-14 15:04:00,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:04:00,537 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 74 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:04:00,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:04:00,640 INFO L134 CoverageAnalysis]: Checked inductivity of 76 backedges. 0 proven. 74 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:04:00,640 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1455196176] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:04:00,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1099667845] [2022-12-14 15:04:00,641 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:04:00,641 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:04:00,641 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:04:00,641 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:04:00,641 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:04:00,988 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:04:02,891 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44635#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:04:02,891 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:04:02,891 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:04:02,892 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 41 [2022-12-14 15:04:02,892 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1868640765] [2022-12-14 15:04:02,892 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:04:02,892 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2022-12-14 15:04:02,892 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:04:02,892 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2022-12-14 15:04:02,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2406, Unknown=0, NotChecked=0, Total=2550 [2022-12-14 15:04:02,892 INFO L87 Difference]: Start difference. First operand 344 states and 405 transitions. Second operand has 41 states, 41 states have (on average 1.2682926829268293) internal successors, (52), 41 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:05,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:04:05,378 INFO L93 Difference]: Finished difference Result 632 states and 705 transitions. [2022-12-14 15:04:05,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-12-14 15:04:05,379 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.2682926829268293) internal successors, (52), 41 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2022-12-14 15:04:05,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:04:05,380 INFO L225 Difference]: With dead ends: 632 [2022-12-14 15:04:05,380 INFO L226 Difference]: Without dead ends: 626 [2022-12-14 15:04:05,381 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 65 SyntacticMatches, 3 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1119 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=315, Invalid=5385, Unknown=0, NotChecked=0, Total=5700 [2022-12-14 15:04:05,381 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 176 mSDsluCounter, 1108 mSDsCounter, 0 mSdLazyCounter, 2812 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 1155 SdHoareTripleChecker+Invalid, 2813 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2812 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 15:04:05,381 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [176 Valid, 1155 Invalid, 2813 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2812 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 15:04:05,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 626 states. [2022-12-14 15:04:05,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 626 to 350. [2022-12-14 15:04:05,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 350 states, 349 states have (on average 1.180515759312321) internal successors, (412), 349 states have internal predecessors, (412), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:05,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 412 transitions. [2022-12-14 15:04:05,749 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 412 transitions. Word has length 31 [2022-12-14 15:04:05,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:04:05,750 INFO L495 AbstractCegarLoop]: Abstraction has 350 states and 412 transitions. [2022-12-14 15:04:05,750 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.2682926829268293) internal successors, (52), 41 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:05,750 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 412 transitions. [2022-12-14 15:04:05,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-12-14 15:04:05,750 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:04:05,750 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:04:05,754 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2022-12-14 15:04:05,951 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:05,951 INFO L420 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:04:05,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:04:05,952 INFO L85 PathProgramCache]: Analyzing trace with hash -1607796067, now seen corresponding path program 52 times [2022-12-14 15:04:05,953 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:04:05,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [874867595] [2022-12-14 15:04:05,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:05,954 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:04:05,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:06,366 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:04:06,366 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:06,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [874867595] [2022-12-14 15:04:06,366 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [874867595] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:04:06,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1994788610] [2022-12-14 15:04:06,366 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:04:06,366 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:06,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:06,367 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:04:06,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2022-12-14 15:04:06,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:06,404 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 54 conjunts are in the unsatisfiable core [2022-12-14 15:04:06,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:04:06,612 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:04:06,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:04:06,829 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:04:06,829 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1994788610] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:04:06,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [786659250] [2022-12-14 15:04:06,830 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:04:06,830 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:04:06,830 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:04:06,830 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:04:06,830 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:04:07,164 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:04:09,029 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '46826#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:04:09,029 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:04:09,029 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:04:09,029 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 39 [2022-12-14 15:04:09,030 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057852188] [2022-12-14 15:04:09,030 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:04:09,030 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-12-14 15:04:09,030 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:04:09,030 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-12-14 15:04:09,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=2210, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 15:04:09,030 INFO L87 Difference]: Start difference. First operand 350 states and 412 transitions. Second operand has 39 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 39 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 15:04:11,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:04:11,056 INFO L93 Difference]: Finished difference Result 520 states and 581 transitions. [2022-12-14 15:04:11,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-12-14 15:04:11,056 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 39 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) Word has length 31 [2022-12-14 15:04:11,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:04:11,057 INFO L225 Difference]: With dead ends: 520 [2022-12-14 15:04:11,057 INFO L226 Difference]: Without dead ends: 500 [2022-12-14 15:04:11,058 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 59 SyntacticMatches, 9 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 822 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=291, Invalid=4679, Unknown=0, NotChecked=0, Total=4970 [2022-12-14 15:04:11,058 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 133 mSDsluCounter, 737 mSDsCounter, 0 mSdLazyCounter, 1905 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 773 SdHoareTripleChecker+Invalid, 1906 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1905 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 15:04:11,058 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [133 Valid, 773 Invalid, 1906 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1905 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 15:04:11,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 500 states. [2022-12-14 15:04:11,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 500 to 344. [2022-12-14 15:04:11,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 343 states have (on average 1.1807580174927115) internal successors, (405), 343 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 15:04:11,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 405 transitions. [2022-12-14 15:04:11,418 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 405 transitions. Word has length 31 [2022-12-14 15:04:11,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:04:11,418 INFO L495 AbstractCegarLoop]: Abstraction has 344 states and 405 transitions. [2022-12-14 15:04:11,418 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 39 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 15:04:11,418 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 405 transitions. [2022-12-14 15:04:11,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-12-14 15:04:11,418 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:04:11,419 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:04:11,422 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Ended with exit code 0 [2022-12-14 15:04:11,619 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2022-12-14 15:04:11,620 INFO L420 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:04:11,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:04:11,621 INFO L85 PathProgramCache]: Analyzing trace with hash 1136620471, now seen corresponding path program 53 times [2022-12-14 15:04:11,621 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:04:11,621 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675084192] [2022-12-14 15:04:11,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:11,622 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:04:11,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:11,972 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:04:11,972 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:11,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675084192] [2022-12-14 15:04:11,972 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675084192] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:04:11,972 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [976801407] [2022-12-14 15:04:11,972 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:04:11,972 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:11,972 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:11,973 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:04:11,974 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2022-12-14 15:04:12,011 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-12-14 15:04:12,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:04:12,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 50 conjunts are in the unsatisfiable core [2022-12-14 15:04:12,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:04:12,233 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:04:12,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:04:12,490 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:04:12,490 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [976801407] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:04:12,490 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1754406202] [2022-12-14 15:04:12,491 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:04:12,491 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:04:12,491 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:04:12,491 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:04:12,491 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:04:12,825 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:04:14,841 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '48786#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:04:14,842 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:04:14,842 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:04:14,842 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 38 [2022-12-14 15:04:14,842 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622164245] [2022-12-14 15:04:14,842 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:04:14,842 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2022-12-14 15:04:14,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:04:14,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2022-12-14 15:04:14,842 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=2111, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 15:04:14,843 INFO L87 Difference]: Start difference. First operand 344 states and 405 transitions. Second operand has 38 states, 38 states have (on average 1.3157894736842106) internal successors, (50), 38 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:16,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:04:16,448 INFO L93 Difference]: Finished difference Result 441 states and 501 transitions. [2022-12-14 15:04:16,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-12-14 15:04:16,449 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.3157894736842106) internal successors, (50), 38 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2022-12-14 15:04:16,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:04:16,450 INFO L225 Difference]: With dead ends: 441 [2022-12-14 15:04:16,450 INFO L226 Difference]: Without dead ends: 420 [2022-12-14 15:04:16,450 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 58 SyntacticMatches, 9 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 828 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=291, Invalid=4265, Unknown=0, NotChecked=0, Total=4556 [2022-12-14 15:04:16,450 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 105 mSDsluCounter, 508 mSDsCounter, 0 mSdLazyCounter, 1392 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 532 SdHoareTripleChecker+Invalid, 1393 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 15:04:16,450 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 532 Invalid, 1393 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1392 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 15:04:16,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 420 states. [2022-12-14 15:04:16,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 420 to 336. [2022-12-14 15:04:16,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 336 states, 335 states have (on average 1.182089552238806) internal successors, (396), 335 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 15:04:16,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 336 states to 336 states and 396 transitions. [2022-12-14 15:04:16,811 INFO L78 Accepts]: Start accepts. Automaton has 336 states and 396 transitions. Word has length 31 [2022-12-14 15:04:16,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:04:16,811 INFO L495 AbstractCegarLoop]: Abstraction has 336 states and 396 transitions. [2022-12-14 15:04:16,811 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.3157894736842106) internal successors, (50), 38 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:16,811 INFO L276 IsEmpty]: Start isEmpty. Operand 336 states and 396 transitions. [2022-12-14 15:04:16,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-12-14 15:04:16,812 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:04:16,812 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:04:16,816 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Ended with exit code 0 [2022-12-14 15:04:17,012 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2022-12-14 15:04:17,012 INFO L420 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:04:17,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:04:17,013 INFO L85 PathProgramCache]: Analyzing trace with hash 498939890, now seen corresponding path program 54 times [2022-12-14 15:04:17,013 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:04:17,013 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [772642330] [2022-12-14 15:04:17,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:17,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:04:17,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:17,190 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 5 proven. 21 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-12-14 15:04:17,190 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:17,190 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [772642330] [2022-12-14 15:04:17,190 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [772642330] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:04:17,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [217868118] [2022-12-14 15:04:17,191 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:04:17,191 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:17,191 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:17,191 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:04:17,192 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2022-12-14 15:04:17,228 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:04:17,228 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:04:17,229 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 15:04:17,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:04:17,440 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-12-14 15:04:17,440 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:04:17,579 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-12-14 15:04:17,579 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [217868118] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:04:17,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1829836749] [2022-12-14 15:04:17,580 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:04:17,580 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:04:17,580 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:04:17,580 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:04:17,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:04:17,914 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:04:19,852 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '50568#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:04:19,852 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:04:19,852 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:04:19,852 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 30 [2022-12-14 15:04:19,852 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667681020] [2022-12-14 15:04:19,852 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:04:19,852 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-12-14 15:04:19,852 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:04:19,853 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-12-14 15:04:19,853 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1431, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 15:04:19,853 INFO L87 Difference]: Start difference. First operand 336 states and 396 transitions. Second operand has 30 states, 30 states have (on average 1.5) internal successors, (45), 30 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 15:04:21,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:04:21,533 INFO L93 Difference]: Finished difference Result 460 states and 533 transitions. [2022-12-14 15:04:21,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-12-14 15:04:21,533 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.5) internal successors, (45), 30 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 31 [2022-12-14 15:04:21,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:04:21,534 INFO L225 Difference]: With dead ends: 460 [2022-12-14 15:04:21,534 INFO L226 Difference]: Without dead ends: 413 [2022-12-14 15:04:21,534 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 62 SyntacticMatches, 5 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 727 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=718, Invalid=3572, Unknown=0, NotChecked=0, Total=4290 [2022-12-14 15:04:21,535 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 464 mSDsluCounter, 265 mSDsCounter, 0 mSdLazyCounter, 475 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 464 SdHoareTripleChecker+Valid, 285 SdHoareTripleChecker+Invalid, 492 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 475 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:04:21,535 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [464 Valid, 285 Invalid, 492 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 475 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:04:21,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2022-12-14 15:04:21,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 366. [2022-12-14 15:04:21,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 366 states, 365 states have (on average 1.1643835616438356) internal successors, (425), 365 states have internal predecessors, (425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:21,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 366 states to 366 states and 425 transitions. [2022-12-14 15:04:21,931 INFO L78 Accepts]: Start accepts. Automaton has 366 states and 425 transitions. Word has length 31 [2022-12-14 15:04:21,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:04:21,931 INFO L495 AbstractCegarLoop]: Abstraction has 366 states and 425 transitions. [2022-12-14 15:04:21,931 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.5) internal successors, (45), 30 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 15:04:21,931 INFO L276 IsEmpty]: Start isEmpty. Operand 366 states and 425 transitions. [2022-12-14 15:04:21,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-12-14 15:04:21,932 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:04:21,932 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:04:21,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2022-12-14 15:04:22,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:22,133 INFO L420 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:04:22,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:04:22,134 INFO L85 PathProgramCache]: Analyzing trace with hash 716327901, now seen corresponding path program 55 times [2022-12-14 15:04:22,134 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:04:22,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [104552314] [2022-12-14 15:04:22,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:22,135 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:04:22,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:22,360 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:04:22,360 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:22,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [104552314] [2022-12-14 15:04:22,360 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [104552314] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:04:22,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1909109787] [2022-12-14 15:04:22,361 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:04:22,361 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:22,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:22,361 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:04:22,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2022-12-14 15:04:22,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:22,411 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 46 conjunts are in the unsatisfiable core [2022-12-14 15:04:22,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:04:22,675 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:04:22,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:04:22,798 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:04:22,798 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1909109787] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:04:22,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [487044071] [2022-12-14 15:04:22,799 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:04:22,799 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:04:22,799 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:04:22,799 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:04:22,799 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:04:23,136 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:04:25,134 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '52465#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:04:25,134 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:04:25,134 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:04:25,134 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 35 [2022-12-14 15:04:25,134 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1614025452] [2022-12-14 15:04:25,135 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:04:25,135 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 15:04:25,135 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:04:25,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 15:04:25,135 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=1839, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 15:04:25,135 INFO L87 Difference]: Start difference. First operand 366 states and 425 transitions. Second operand has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 35 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 15:04:26,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:04:26,419 INFO L93 Difference]: Finished difference Result 436 states and 498 transitions. [2022-12-14 15:04:26,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 15:04:26,419 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 35 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) Word has length 31 [2022-12-14 15:04:26,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:04:26,420 INFO L225 Difference]: With dead ends: 436 [2022-12-14 15:04:26,420 INFO L226 Difference]: Without dead ends: 414 [2022-12-14 15:04:26,420 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 129 GetRequests, 63 SyntacticMatches, 5 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 815 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=282, Invalid=3624, Unknown=0, NotChecked=0, Total=3906 [2022-12-14 15:04:26,420 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 83 mSDsluCounter, 273 mSDsCounter, 0 mSdLazyCounter, 746 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 288 SdHoareTripleChecker+Invalid, 747 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 746 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:04:26,420 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 288 Invalid, 747 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 746 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:04:26,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 414 states. [2022-12-14 15:04:26,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 414 to 364. [2022-12-14 15:04:26,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 364 states, 363 states have (on average 1.1680440771349863) internal successors, (424), 363 states have internal predecessors, (424), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:26,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 424 transitions. [2022-12-14 15:04:26,822 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 424 transitions. Word has length 31 [2022-12-14 15:04:26,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:04:26,823 INFO L495 AbstractCegarLoop]: Abstraction has 364 states and 424 transitions. [2022-12-14 15:04:26,823 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.3428571428571427) internal successors, (47), 35 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 15:04:26,823 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 424 transitions. [2022-12-14 15:04:26,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2022-12-14 15:04:26,823 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:04:26,823 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:04:26,828 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2022-12-14 15:04:27,024 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable61 [2022-12-14 15:04:27,024 INFO L420 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:04:27,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:04:27,025 INFO L85 PathProgramCache]: Analyzing trace with hash 329430856, now seen corresponding path program 56 times [2022-12-14 15:04:27,025 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:04:27,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419548221] [2022-12-14 15:04:27,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:27,026 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:04:27,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:27,211 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2022-12-14 15:04:27,211 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:27,211 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [419548221] [2022-12-14 15:04:27,211 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [419548221] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:04:27,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1500536840] [2022-12-14 15:04:27,212 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:04:27,212 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:27,212 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:27,212 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:04:27,213 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2022-12-14 15:04:27,251 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 15:04:27,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:04:27,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 20 conjunts are in the unsatisfiable core [2022-12-14 15:04:27,252 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:04:27,444 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-12-14 15:04:27,444 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:04:27,615 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 5 proven. 20 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2022-12-14 15:04:27,615 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1500536840] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:04:27,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1665639182] [2022-12-14 15:04:27,616 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:04:27,616 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:04:27,616 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:04:27,616 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:04:27,616 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:04:27,936 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:04:29,872 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '54293#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:04:29,872 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:04:29,872 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:04:29,872 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 13] total 30 [2022-12-14 15:04:29,873 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504701225] [2022-12-14 15:04:29,873 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:04:29,873 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2022-12-14 15:04:29,873 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:04:29,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2022-12-14 15:04:29,873 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1431, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 15:04:29,873 INFO L87 Difference]: Start difference. First operand 364 states and 424 transitions. Second operand has 30 states, 30 states have (on average 1.5333333333333334) internal successors, (46), 30 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:31,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:04:31,099 INFO L93 Difference]: Finished difference Result 415 states and 471 transitions. [2022-12-14 15:04:31,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2022-12-14 15:04:31,100 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.5333333333333334) internal successors, (46), 30 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 31 [2022-12-14 15:04:31,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:04:31,100 INFO L225 Difference]: With dead ends: 415 [2022-12-14 15:04:31,100 INFO L226 Difference]: Without dead ends: 389 [2022-12-14 15:04:31,101 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 62 SyntacticMatches, 5 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 429 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=277, Invalid=2479, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 15:04:31,101 INFO L413 NwaCegarLoop]: 35 mSDtfsCounter, 396 mSDsluCounter, 498 mSDsCounter, 0 mSdLazyCounter, 843 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 396 SdHoareTripleChecker+Valid, 533 SdHoareTripleChecker+Invalid, 859 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 843 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:04:31,101 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [396 Valid, 533 Invalid, 859 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 843 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:04:31,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2022-12-14 15:04:31,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 364. [2022-12-14 15:04:31,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 364 states, 363 states have (on average 1.1460055096418733) internal successors, (416), 363 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 15:04:31,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 364 states to 364 states and 416 transitions. [2022-12-14 15:04:31,519 INFO L78 Accepts]: Start accepts. Automaton has 364 states and 416 transitions. Word has length 31 [2022-12-14 15:04:31,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:04:31,519 INFO L495 AbstractCegarLoop]: Abstraction has 364 states and 416 transitions. [2022-12-14 15:04:31,519 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.5333333333333334) internal successors, (46), 30 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:31,520 INFO L276 IsEmpty]: Start isEmpty. Operand 364 states and 416 transitions. [2022-12-14 15:04:31,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-12-14 15:04:31,520 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:04:31,520 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:04:31,524 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Ended with exit code 0 [2022-12-14 15:04:31,721 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:31,721 INFO L420 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:04:31,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:04:31,722 INFO L85 PathProgramCache]: Analyzing trace with hash -1002179945, now seen corresponding path program 57 times [2022-12-14 15:04:31,722 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:04:31,722 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [889665208] [2022-12-14 15:04:31,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:31,723 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:04:31,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:31,974 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:04:31,974 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:31,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [889665208] [2022-12-14 15:04:31,975 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [889665208] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:04:31,975 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [41389776] [2022-12-14 15:04:31,975 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:04:31,975 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:31,975 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:31,976 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:04:31,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2022-12-14 15:04:32,026 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:04:32,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:04:32,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 15:04:32,029 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:04:32,519 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:04:32,519 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:04:32,957 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:04:32,957 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [41389776] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:04:32,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [957045962] [2022-12-14 15:04:32,958 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:04:32,958 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:04:32,958 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:04:32,958 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:04:32,958 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:04:33,302 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:04:35,658 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '56090#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:04:35,659 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:04:35,659 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:04:35,659 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 49 [2022-12-14 15:04:35,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724657487] [2022-12-14 15:04:35,659 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:04:35,659 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-12-14 15:04:35,659 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:04:35,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-12-14 15:04:35,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=3243, Unknown=0, NotChecked=0, Total=3422 [2022-12-14 15:04:35,660 INFO L87 Difference]: Start difference. First operand 364 states and 416 transitions. Second operand has 49 states, 49 states have (on average 1.469387755102041) internal successors, (72), 49 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:40,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:04:40,556 INFO L93 Difference]: Finished difference Result 633 states and 700 transitions. [2022-12-14 15:04:40,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2022-12-14 15:04:40,556 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.469387755102041) internal successors, (72), 49 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-12-14 15:04:40,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:04:40,557 INFO L225 Difference]: With dead ends: 633 [2022-12-14 15:04:40,558 INFO L226 Difference]: Without dead ends: 601 [2022-12-14 15:04:40,558 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 49 SyntacticMatches, 9 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2998 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=2772, Invalid=12978, Unknown=0, NotChecked=0, Total=15750 [2022-12-14 15:04:40,558 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 1313 mSDsluCounter, 604 mSDsCounter, 0 mSdLazyCounter, 1269 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1313 SdHoareTripleChecker+Valid, 641 SdHoareTripleChecker+Invalid, 1317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 1269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 15:04:40,559 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1313 Valid, 641 Invalid, 1317 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 1269 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 15:04:40,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2022-12-14 15:04:41,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 402. [2022-12-14 15:04:41,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 402 states, 401 states have (on average 1.144638403990025) internal successors, (459), 401 states have internal predecessors, (459), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:41,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 459 transitions. [2022-12-14 15:04:41,034 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 459 transitions. Word has length 32 [2022-12-14 15:04:41,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:04:41,034 INFO L495 AbstractCegarLoop]: Abstraction has 402 states and 459 transitions. [2022-12-14 15:04:41,034 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.469387755102041) internal successors, (72), 49 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:41,034 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 459 transitions. [2022-12-14 15:04:41,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-12-14 15:04:41,034 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:04:41,034 INFO L195 NwaCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:04:41,039 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2022-12-14 15:04:41,235 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2022-12-14 15:04:41,236 INFO L420 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:04:41,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:04:41,236 INFO L85 PathProgramCache]: Analyzing trace with hash 712316772, now seen corresponding path program 58 times [2022-12-14 15:04:41,237 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:04:41,237 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [165951879] [2022-12-14 15:04:41,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:41,237 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:04:41,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:41,480 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:04:41,481 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:41,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [165951879] [2022-12-14 15:04:41,481 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [165951879] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:04:41,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1344887946] [2022-12-14 15:04:41,481 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:04:41,481 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:41,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:41,482 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:04:41,482 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2022-12-14 15:04:41,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:41,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 28 conjunts are in the unsatisfiable core [2022-12-14 15:04:41,520 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:04:42,043 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:04:42,043 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:04:42,447 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 9 proven. 72 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:04:42,447 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1344887946] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:04:42,447 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1584873092] [2022-12-14 15:04:42,448 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:04:42,448 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:04:42,448 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:04:42,448 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:04:42,448 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:04:42,801 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:04:44,806 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '58491#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:04:44,807 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:04:44,807 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:04:44,807 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 49 [2022-12-14 15:04:44,807 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469916218] [2022-12-14 15:04:44,807 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:04:44,807 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-12-14 15:04:44,807 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:04:44,808 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-12-14 15:04:44,808 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=3243, Unknown=0, NotChecked=0, Total=3422 [2022-12-14 15:04:44,808 INFO L87 Difference]: Start difference. First operand 402 states and 459 transitions. Second operand has 49 states, 49 states have (on average 1.469387755102041) internal successors, (72), 49 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:47,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:04:47,932 INFO L93 Difference]: Finished difference Result 620 states and 682 transitions. [2022-12-14 15:04:47,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-12-14 15:04:47,933 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.469387755102041) internal successors, (72), 49 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-12-14 15:04:47,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:04:47,934 INFO L225 Difference]: With dead ends: 620 [2022-12-14 15:04:47,934 INFO L226 Difference]: Without dead ends: 606 [2022-12-14 15:04:47,934 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 49 SyntacticMatches, 9 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1023 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=522, Invalid=6284, Unknown=0, NotChecked=0, Total=6806 [2022-12-14 15:04:47,934 INFO L413 NwaCegarLoop]: 63 mSDtfsCounter, 1127 mSDsluCounter, 1561 mSDsCounter, 0 mSdLazyCounter, 2112 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1127 SdHoareTripleChecker+Valid, 1624 SdHoareTripleChecker+Invalid, 2161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 2112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 15:04:47,934 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1127 Valid, 1624 Invalid, 2161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 2112 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 15:04:47,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 606 states. [2022-12-14 15:04:48,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 606 to 407. [2022-12-14 15:04:48,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 407 states, 406 states have (on average 1.1428571428571428) internal successors, (464), 406 states have internal predecessors, (464), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:48,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 407 states to 407 states and 464 transitions. [2022-12-14 15:04:48,433 INFO L78 Accepts]: Start accepts. Automaton has 407 states and 464 transitions. Word has length 32 [2022-12-14 15:04:48,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:04:48,433 INFO L495 AbstractCegarLoop]: Abstraction has 407 states and 464 transitions. [2022-12-14 15:04:48,433 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.469387755102041) internal successors, (72), 49 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:48,433 INFO L276 IsEmpty]: Start isEmpty. Operand 407 states and 464 transitions. [2022-12-14 15:04:48,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-12-14 15:04:48,433 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:04:48,433 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:04:48,438 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Ended with exit code 0 [2022-12-14 15:04:48,634 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:48,634 INFO L420 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:04:48,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:04:48,635 INFO L85 PathProgramCache]: Analyzing trace with hash 238805657, now seen corresponding path program 59 times [2022-12-14 15:04:48,636 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:04:48,636 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [505157426] [2022-12-14 15:04:48,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:48,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:04:48,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:48,723 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-12-14 15:04:48,723 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:48,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [505157426] [2022-12-14 15:04:48,723 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [505157426] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:04:48,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [841813213] [2022-12-14 15:04:48,723 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:04:48,723 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:48,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:48,724 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:04:48,725 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2022-12-14 15:04:48,766 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 15:04:48,766 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:04:48,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 15:04:48,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:04:48,817 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-12-14 15:04:48,817 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:04:48,856 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-12-14 15:04:48,856 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [841813213] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:04:48,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [260154307] [2022-12-14 15:04:48,857 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:04:48,857 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:04:48,858 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:04:48,858 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:04:48,858 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:04:49,186 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:04:50,525 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '60761#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:04:50,525 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:04:50,525 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:04:50,525 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-12-14 15:04:50,526 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1081871626] [2022-12-14 15:04:50,526 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:04:50,526 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 15:04:50,526 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:04:50,526 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 15:04:50,526 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=687, Unknown=0, NotChecked=0, Total=870 [2022-12-14 15:04:50,526 INFO L87 Difference]: Start difference. First operand 407 states and 464 transitions. Second operand has 20 states, 20 states have (on average 1.7) internal successors, (34), 20 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:51,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:04:51,281 INFO L93 Difference]: Finished difference Result 441 states and 494 transitions. [2022-12-14 15:04:51,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 15:04:51,282 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.7) internal successors, (34), 20 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-12-14 15:04:51,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:04:51,282 INFO L225 Difference]: With dead ends: 441 [2022-12-14 15:04:51,283 INFO L226 Difference]: Without dead ends: 437 [2022-12-14 15:04:51,283 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 69 SyntacticMatches, 10 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 644 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=353, Invalid=1207, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 15:04:51,283 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 62 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:04:51,283 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 116 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:04:51,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2022-12-14 15:04:51,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 390. [2022-12-14 15:04:51,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 390 states, 389 states have (on average 1.1388174807197944) internal successors, (443), 389 states have internal predecessors, (443), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:51,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 390 states to 390 states and 443 transitions. [2022-12-14 15:04:51,758 INFO L78 Accepts]: Start accepts. Automaton has 390 states and 443 transitions. Word has length 32 [2022-12-14 15:04:51,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:04:51,759 INFO L495 AbstractCegarLoop]: Abstraction has 390 states and 443 transitions. [2022-12-14 15:04:51,759 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.7) internal successors, (34), 20 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:51,759 INFO L276 IsEmpty]: Start isEmpty. Operand 390 states and 443 transitions. [2022-12-14 15:04:51,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2022-12-14 15:04:51,759 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:04:51,759 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:04:51,763 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Ended with exit code 0 [2022-12-14 15:04:51,960 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable65,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:51,960 INFO L420 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:04:51,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:04:51,961 INFO L85 PathProgramCache]: Analyzing trace with hash -900549186, now seen corresponding path program 60 times [2022-12-14 15:04:51,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:04:51,962 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [536517237] [2022-12-14 15:04:51,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:51,963 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:04:51,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:52,063 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-12-14 15:04:52,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:52,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [536517237] [2022-12-14 15:04:52,063 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [536517237] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:04:52,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [117388264] [2022-12-14 15:04:52,063 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:04:52,063 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:52,063 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:52,064 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:04:52,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2022-12-14 15:04:52,103 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:04:52,103 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:04:52,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 12 conjunts are in the unsatisfiable core [2022-12-14 15:04:52,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:04:52,151 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-12-14 15:04:52,151 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:04:52,197 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-12-14 15:04:52,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [117388264] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:04:52,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [497289528] [2022-12-14 15:04:52,198 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:04:52,198 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:04:52,198 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:04:52,198 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:04:52,199 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:04:52,544 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:04:54,362 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '62627#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:04:54,362 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:04:54,362 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:04:54,362 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2022-12-14 15:04:54,362 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [252041647] [2022-12-14 15:04:54,362 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:04:54,363 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2022-12-14 15:04:54,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:04:54,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2022-12-14 15:04:54,363 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=684, Unknown=0, NotChecked=0, Total=870 [2022-12-14 15:04:54,363 INFO L87 Difference]: Start difference. First operand 390 states and 443 transitions. Second operand has 20 states, 20 states have (on average 1.7) internal successors, (34), 20 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:55,108 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:04:55,108 INFO L93 Difference]: Finished difference Result 507 states and 575 transitions. [2022-12-14 15:04:55,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 15:04:55,108 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.7) internal successors, (34), 20 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2022-12-14 15:04:55,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:04:55,109 INFO L225 Difference]: With dead ends: 507 [2022-12-14 15:04:55,109 INFO L226 Difference]: Without dead ends: 424 [2022-12-14 15:04:55,109 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 69 SyntacticMatches, 10 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 641 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=356, Invalid=1204, Unknown=0, NotChecked=0, Total=1560 [2022-12-14 15:04:55,110 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 103 mSDsluCounter, 121 mSDsCounter, 0 mSdLazyCounter, 174 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 174 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:04:55,110 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [103 Valid, 153 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 174 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:04:55,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2022-12-14 15:04:55,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 399. [2022-12-14 15:04:55,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 399 states, 398 states have (on average 1.135678391959799) internal successors, (452), 398 states have internal predecessors, (452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:55,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 452 transitions. [2022-12-14 15:04:55,626 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 452 transitions. Word has length 32 [2022-12-14 15:04:55,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:04:55,626 INFO L495 AbstractCegarLoop]: Abstraction has 399 states and 452 transitions. [2022-12-14 15:04:55,626 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.7) internal successors, (34), 20 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:04:55,626 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 452 transitions. [2022-12-14 15:04:55,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-12-14 15:04:55,627 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:04:55,627 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:04:55,631 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2022-12-14 15:04:55,827 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2022-12-14 15:04:55,828 INFO L420 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:04:55,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:04:55,828 INFO L85 PathProgramCache]: Analyzing trace with hash 1069831626, now seen corresponding path program 61 times [2022-12-14 15:04:55,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:04:55,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110494378] [2022-12-14 15:04:55,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:04:55,828 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:04:55,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:56,272 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:04:56,272 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:04:56,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110494378] [2022-12-14 15:04:56,273 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [110494378] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:04:56,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1607943204] [2022-12-14 15:04:56,273 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:04:56,273 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:04:56,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:04:56,274 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:04:56,274 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2022-12-14 15:04:56,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:04:56,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 62 conjunts are in the unsatisfiable core [2022-12-14 15:04:56,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:04:56,727 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:04:56,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:04:56,861 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:04:56,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1607943204] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:04:56,861 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [818532926] [2022-12-14 15:04:56,862 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:04:56,862 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:04:56,862 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:04:56,862 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:04:56,862 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:04:57,187 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:04:59,260 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '64673#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:04:59,260 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:04:59,260 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:04:59,260 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 44 [2022-12-14 15:04:59,260 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1090379089] [2022-12-14 15:04:59,261 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:04:59,261 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-12-14 15:04:59,261 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:04:59,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-12-14 15:04:59,261 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=2711, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 15:04:59,261 INFO L87 Difference]: Start difference. First operand 399 states and 452 transitions. Second operand has 44 states, 44 states have (on average 1.25) internal successors, (55), 44 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:02,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:05:02,318 INFO L93 Difference]: Finished difference Result 726 states and 790 transitions. [2022-12-14 15:05:02,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-12-14 15:05:02,319 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.25) internal successors, (55), 44 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2022-12-14 15:05:02,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:05:02,320 INFO L225 Difference]: With dead ends: 726 [2022-12-14 15:05:02,320 INFO L226 Difference]: Without dead ends: 720 [2022-12-14 15:05:02,320 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 70 SyntacticMatches, 3 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1266 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=333, Invalid=6147, Unknown=0, NotChecked=0, Total=6480 [2022-12-14 15:05:02,320 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 192 mSDsluCounter, 1325 mSDsCounter, 0 mSdLazyCounter, 3322 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 1378 SdHoareTripleChecker+Invalid, 3323 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:05:02,320 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [192 Valid, 1378 Invalid, 3323 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3322 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-12-14 15:05:02,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 720 states. [2022-12-14 15:05:02,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 720 to 405. [2022-12-14 15:05:02,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 405 states, 404 states have (on average 1.136138613861386) internal successors, (459), 404 states have internal predecessors, (459), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:02,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 405 states to 405 states and 459 transitions. [2022-12-14 15:05:02,815 INFO L78 Accepts]: Start accepts. Automaton has 405 states and 459 transitions. Word has length 33 [2022-12-14 15:05:02,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:05:02,815 INFO L495 AbstractCegarLoop]: Abstraction has 405 states and 459 transitions. [2022-12-14 15:05:02,815 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.25) internal successors, (55), 44 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:02,815 INFO L276 IsEmpty]: Start isEmpty. Operand 405 states and 459 transitions. [2022-12-14 15:05:02,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-12-14 15:05:02,816 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:05:02,816 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:05:02,820 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2022-12-14 15:05:03,016 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2022-12-14 15:05:03,017 INFO L420 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:05:03,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:05:03,018 INFO L85 PathProgramCache]: Analyzing trace with hash -1286200944, now seen corresponding path program 62 times [2022-12-14 15:05:03,018 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:05:03,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [64472182] [2022-12-14 15:05:03,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:05:03,019 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:05:03,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:05:03,342 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 62 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:05:03,342 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:05:03,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [64472182] [2022-12-14 15:05:03,342 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [64472182] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:05:03,342 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1344442938] [2022-12-14 15:05:03,342 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:05:03,342 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:05:03,342 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:05:03,343 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:05:03,343 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2022-12-14 15:05:03,387 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 15:05:03,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:05:03,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 58 conjunts are in the unsatisfiable core [2022-12-14 15:05:03,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:05:03,733 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 62 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:05:03,733 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:05:03,861 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 0 proven. 62 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:05:03,861 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1344442938] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:05:03,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1641687025] [2022-12-14 15:05:03,862 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:05:03,862 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:05:03,862 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:05:03,862 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:05:03,862 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:05:04,195 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:05:06,058 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '67177#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:05:06,058 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:05:06,058 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:05:06,058 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 42 [2022-12-14 15:05:06,058 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154524114] [2022-12-14 15:05:06,058 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:05:06,058 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-12-14 15:05:06,058 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:05:06,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-12-14 15:05:06,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=2502, Unknown=0, NotChecked=0, Total=2652 [2022-12-14 15:05:06,059 INFO L87 Difference]: Start difference. First operand 405 states and 459 transitions. Second operand has 42 states, 42 states have (on average 1.2857142857142858) internal successors, (54), 42 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:08,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:05:08,568 INFO L93 Difference]: Finished difference Result 601 states and 654 transitions. [2022-12-14 15:05:08,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-12-14 15:05:08,569 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.2857142857142858) internal successors, (54), 42 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2022-12-14 15:05:08,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:05:08,570 INFO L225 Difference]: With dead ends: 601 [2022-12-14 15:05:08,570 INFO L226 Difference]: Without dead ends: 580 [2022-12-14 15:05:08,570 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 68 SyntacticMatches, 5 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1123 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=309, Invalid=5391, Unknown=0, NotChecked=0, Total=5700 [2022-12-14 15:05:08,571 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 150 mSDsluCounter, 863 mSDsCounter, 0 mSdLazyCounter, 2041 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 906 SdHoareTripleChecker+Invalid, 2042 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2041 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 15:05:08,571 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 906 Invalid, 2042 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2041 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 15:05:08,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 580 states. [2022-12-14 15:05:09,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 580 to 399. [2022-12-14 15:05:09,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 399 states, 398 states have (on average 1.135678391959799) internal successors, (452), 398 states have internal predecessors, (452), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:09,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 452 transitions. [2022-12-14 15:05:09,059 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 452 transitions. Word has length 33 [2022-12-14 15:05:09,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:05:09,059 INFO L495 AbstractCegarLoop]: Abstraction has 399 states and 452 transitions. [2022-12-14 15:05:09,059 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.2857142857142858) internal successors, (54), 42 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:09,059 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 452 transitions. [2022-12-14 15:05:09,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-12-14 15:05:09,059 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:05:09,059 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:05:09,063 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Ended with exit code 0 [2022-12-14 15:05:09,260 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68,66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:05:09,260 INFO L420 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:05:09,261 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:05:09,261 INFO L85 PathProgramCache]: Analyzing trace with hash -427054070, now seen corresponding path program 63 times [2022-12-14 15:05:09,262 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:05:09,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1815354255] [2022-12-14 15:05:09,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:05:09,262 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:05:09,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:05:09,615 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:05:09,615 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:05:09,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1815354255] [2022-12-14 15:05:09,616 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1815354255] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:05:09,616 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1754385849] [2022-12-14 15:05:09,616 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:05:09,616 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:05:09,616 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:05:09,617 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:05:09,617 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2022-12-14 15:05:09,655 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:05:09,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:05:09,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 54 conjunts are in the unsatisfiable core [2022-12-14 15:05:09,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:05:09,940 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:05:09,940 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:05:10,055 INFO L134 CoverageAnalysis]: Checked inductivity of 54 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:05:10,055 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1754385849] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:05:10,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1265576189] [2022-12-14 15:05:10,055 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:05:10,056 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:05:10,056 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:05:10,056 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:05:10,056 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:05:10,408 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:05:12,258 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '69423#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:05:12,259 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:05:12,259 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:05:12,259 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 40 [2022-12-14 15:05:12,259 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684627452] [2022-12-14 15:05:12,259 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:05:12,259 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-12-14 15:05:12,259 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:05:12,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-12-14 15:05:12,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=2301, Unknown=0, NotChecked=0, Total=2450 [2022-12-14 15:05:12,260 INFO L87 Difference]: Start difference. First operand 399 states and 452 transitions. Second operand has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:14,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:05:14,260 INFO L93 Difference]: Finished difference Result 513 states and 565 transitions. [2022-12-14 15:05:14,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-12-14 15:05:14,261 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2022-12-14 15:05:14,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:05:14,261 INFO L225 Difference]: With dead ends: 513 [2022-12-14 15:05:14,262 INFO L226 Difference]: Without dead ends: 491 [2022-12-14 15:05:14,262 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 68 SyntacticMatches, 5 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1030 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=304, Invalid=4808, Unknown=0, NotChecked=0, Total=5112 [2022-12-14 15:05:14,262 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 117 mSDsluCounter, 614 mSDsCounter, 0 mSdLazyCounter, 1586 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 645 SdHoareTripleChecker+Invalid, 1587 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1586 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 15:05:14,263 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [117 Valid, 645 Invalid, 1587 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1586 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 15:05:14,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 491 states. [2022-12-14 15:05:14,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 491 to 391. [2022-12-14 15:05:14,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 390 states have (on average 1.1358974358974359) internal successors, (443), 390 states have internal predecessors, (443), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:14,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 443 transitions. [2022-12-14 15:05:14,755 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 443 transitions. Word has length 33 [2022-12-14 15:05:14,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:05:14,755 INFO L495 AbstractCegarLoop]: Abstraction has 391 states and 443 transitions. [2022-12-14 15:05:14,755 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:14,755 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 443 transitions. [2022-12-14 15:05:14,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-12-14 15:05:14,756 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:05:14,756 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:05:14,760 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Ended with exit code 0 [2022-12-14 15:05:14,956 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2022-12-14 15:05:14,957 INFO L420 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:05:14,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:05:14,958 INFO L85 PathProgramCache]: Analyzing trace with hash 1434968912, now seen corresponding path program 64 times [2022-12-14 15:05:14,958 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:05:14,958 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [259904183] [2022-12-14 15:05:14,958 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:05:14,959 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:05:14,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:05:15,274 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:05:15,274 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:05:15,274 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [259904183] [2022-12-14 15:05:15,274 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [259904183] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:05:15,275 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [711591536] [2022-12-14 15:05:15,275 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:05:15,275 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:05:15,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:05:15,275 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:05:15,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2022-12-14 15:05:15,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:05:15,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 50 conjunts are in the unsatisfiable core [2022-12-14 15:05:15,319 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:05:15,616 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:05:15,617 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:05:15,876 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:05:15,877 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [711591536] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:05:15,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1588884405] [2022-12-14 15:05:15,877 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:05:15,877 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:05:15,877 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:05:15,878 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:05:15,878 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:05:16,220 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:05:18,129 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '71481#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:05:18,129 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:05:18,129 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:05:18,129 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 40 [2022-12-14 15:05:18,129 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846873356] [2022-12-14 15:05:18,129 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:05:18,129 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-12-14 15:05:18,129 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:05:18,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-12-14 15:05:18,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=2295, Unknown=0, NotChecked=0, Total=2450 [2022-12-14 15:05:18,130 INFO L87 Difference]: Start difference. First operand 391 states and 443 transitions. Second operand has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:19,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:05:19,723 INFO L93 Difference]: Finished difference Result 443 states and 494 transitions. [2022-12-14 15:05:19,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 15:05:19,724 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2022-12-14 15:05:19,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:05:19,725 INFO L225 Difference]: With dead ends: 443 [2022-12-14 15:05:19,725 INFO L226 Difference]: Without dead ends: 420 [2022-12-14 15:05:19,725 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 62 SyntacticMatches, 9 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 930 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=308, Invalid=4522, Unknown=0, NotChecked=0, Total=4830 [2022-12-14 15:05:19,725 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 90 mSDsluCounter, 403 mSDsCounter, 0 mSdLazyCounter, 1177 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 422 SdHoareTripleChecker+Invalid, 1178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 15:05:19,725 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [90 Valid, 422 Invalid, 1178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1177 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 15:05:19,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 420 states. [2022-12-14 15:05:20,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 420 to 381. [2022-12-14 15:05:20,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 381 states, 380 states have (on average 1.1368421052631579) internal successors, (432), 380 states have internal predecessors, (432), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:20,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 381 states to 381 states and 432 transitions. [2022-12-14 15:05:20,198 INFO L78 Accepts]: Start accepts. Automaton has 381 states and 432 transitions. Word has length 33 [2022-12-14 15:05:20,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:05:20,198 INFO L495 AbstractCegarLoop]: Abstraction has 381 states and 432 transitions. [2022-12-14 15:05:20,198 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:20,198 INFO L276 IsEmpty]: Start isEmpty. Operand 381 states and 432 transitions. [2022-12-14 15:05:20,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-12-14 15:05:20,199 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:05:20,199 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:05:20,203 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Ended with exit code 0 [2022-12-14 15:05:20,399 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:05:20,400 INFO L420 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:05:20,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:05:20,401 INFO L85 PathProgramCache]: Analyzing trace with hash -1216753078, now seen corresponding path program 65 times [2022-12-14 15:05:20,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:05:20,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [927881585] [2022-12-14 15:05:20,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:05:20,402 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:05:20,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:05:20,642 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:05:20,642 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:05:20,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [927881585] [2022-12-14 15:05:20,642 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [927881585] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:05:20,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1087689530] [2022-12-14 15:05:20,642 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:05:20,642 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:05:20,642 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:05:20,643 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:05:20,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2022-12-14 15:05:20,699 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 15:05:20,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:05:20,701 INFO L263 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 46 conjunts are in the unsatisfiable core [2022-12-14 15:05:20,702 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:05:21,013 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:05:21,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:05:21,139 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:05:21,139 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1087689530] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:05:21,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1037953962] [2022-12-14 15:05:21,140 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:05:21,140 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:05:21,140 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:05:21,140 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:05:21,140 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:05:21,465 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:05:23,580 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '73379#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:05:23,580 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:05:23,581 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:05:23,581 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 36 [2022-12-14 15:05:23,581 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182641876] [2022-12-14 15:05:23,581 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:05:23,581 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2022-12-14 15:05:23,581 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:05:23,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2022-12-14 15:05:23,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1923, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 15:05:23,582 INFO L87 Difference]: Start difference. First operand 381 states and 432 transitions. Second operand has 36 states, 36 states have (on average 1.3333333333333333) internal successors, (48), 36 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:24,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:05:24,881 INFO L93 Difference]: Finished difference Result 417 states and 470 transitions. [2022-12-14 15:05:24,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-12-14 15:05:24,881 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.3333333333333333) internal successors, (48), 36 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2022-12-14 15:05:24,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:05:24,882 INFO L225 Difference]: With dead ends: 417 [2022-12-14 15:05:24,882 INFO L226 Difference]: Without dead ends: 413 [2022-12-14 15:05:24,883 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 68 SyntacticMatches, 5 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 857 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=294, Invalid=3738, Unknown=0, NotChecked=0, Total=4032 [2022-12-14 15:05:24,883 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 65 mSDsluCounter, 239 mSDsCounter, 0 mSdLazyCounter, 634 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 634 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:05:24,883 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 250 Invalid, 635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 634 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:05:24,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2022-12-14 15:05:25,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 391. [2022-12-14 15:05:25,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 390 states have (on average 1.1384615384615384) internal successors, (444), 390 states have internal predecessors, (444), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:25,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 444 transitions. [2022-12-14 15:05:25,383 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 444 transitions. Word has length 33 [2022-12-14 15:05:25,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:05:25,383 INFO L495 AbstractCegarLoop]: Abstraction has 391 states and 444 transitions. [2022-12-14 15:05:25,383 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.3333333333333333) internal successors, (48), 36 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:25,383 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 444 transitions. [2022-12-14 15:05:25,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-12-14 15:05:25,383 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:05:25,384 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:05:25,387 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Ended with exit code 0 [2022-12-14 15:05:25,584 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:05:25,585 INFO L420 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:05:25,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:05:25,586 INFO L85 PathProgramCache]: Analyzing trace with hash -732109788, now seen corresponding path program 66 times [2022-12-14 15:05:25,586 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:05:25,586 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [39850298] [2022-12-14 15:05:25,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:05:25,587 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:05:25,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:05:25,910 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:05:25,911 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:05:25,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [39850298] [2022-12-14 15:05:25,911 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [39850298] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:05:25,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1088463002] [2022-12-14 15:05:25,911 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:05:25,911 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:05:25,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:05:25,912 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:05:25,913 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2022-12-14 15:05:25,950 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:05:25,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:05:25,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 15:05:25,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:05:26,483 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:05:26,483 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:05:26,967 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:05:26,967 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1088463002] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:05:26,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1309688300] [2022-12-14 15:05:26,967 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:05:26,967 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:05:26,968 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:05:26,968 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:05:26,968 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:05:27,312 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:05:29,539 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '75269#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:05:29,539 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:05:29,539 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:05:29,539 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 54 [2022-12-14 15:05:29,539 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1684475901] [2022-12-14 15:05:29,539 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:05:29,540 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-12-14 15:05:29,540 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:05:29,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-12-14 15:05:29,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=3839, Unknown=0, NotChecked=0, Total=4032 [2022-12-14 15:05:29,540 INFO L87 Difference]: Start difference. First operand 391 states and 444 transitions. Second operand has 54 states, 54 states have (on average 1.4259259259259258) internal successors, (77), 54 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:35,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:05:35,958 INFO L93 Difference]: Finished difference Result 696 states and 764 transitions. [2022-12-14 15:05:35,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2022-12-14 15:05:35,959 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.4259259259259258) internal successors, (77), 54 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-12-14 15:05:35,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:05:35,960 INFO L225 Difference]: With dead ends: 696 [2022-12-14 15:05:35,960 INFO L226 Difference]: Without dead ends: 662 [2022-12-14 15:05:35,961 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 203 GetRequests, 51 SyntacticMatches, 10 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4048 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=3661, Invalid=16931, Unknown=0, NotChecked=0, Total=20592 [2022-12-14 15:05:35,961 INFO L413 NwaCegarLoop]: 41 mSDtfsCounter, 1630 mSDsluCounter, 748 mSDsCounter, 0 mSdLazyCounter, 1633 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1630 SdHoareTripleChecker+Valid, 789 SdHoareTripleChecker+Invalid, 1688 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 1633 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 15:05:35,961 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1630 Valid, 789 Invalid, 1688 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 1633 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 15:05:35,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 662 states. [2022-12-14 15:05:36,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 662 to 430. [2022-12-14 15:05:36,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 430 states, 429 states have (on average 1.1375291375291374) internal successors, (488), 429 states have internal predecessors, (488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:36,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 430 states to 430 states and 488 transitions. [2022-12-14 15:05:36,521 INFO L78 Accepts]: Start accepts. Automaton has 430 states and 488 transitions. Word has length 34 [2022-12-14 15:05:36,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:05:36,521 INFO L495 AbstractCegarLoop]: Abstraction has 430 states and 488 transitions. [2022-12-14 15:05:36,521 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.4259259259259258) internal successors, (77), 54 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:36,521 INFO L276 IsEmpty]: Start isEmpty. Operand 430 states and 488 transitions. [2022-12-14 15:05:36,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-12-14 15:05:36,521 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:05:36,521 INFO L195 NwaCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:05:36,525 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Ended with exit code 0 [2022-12-14 15:05:36,722 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable72 [2022-12-14 15:05:36,722 INFO L420 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:05:36,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:05:36,723 INFO L85 PathProgramCache]: Analyzing trace with hash 877680887, now seen corresponding path program 67 times [2022-12-14 15:05:36,723 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:05:36,724 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [431145467] [2022-12-14 15:05:36,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:05:36,724 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:05:36,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:05:37,047 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:05:37,047 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:05:37,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [431145467] [2022-12-14 15:05:37,047 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [431145467] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:05:37,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [185564914] [2022-12-14 15:05:37,047 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:05:37,047 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:05:37,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:05:37,048 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:05:37,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2022-12-14 15:05:37,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:05:37,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 30 conjunts are in the unsatisfiable core [2022-12-14 15:05:37,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:05:37,763 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:05:37,763 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:05:38,394 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 10 proven. 90 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:05:38,394 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [185564914] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:05:38,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [80971710] [2022-12-14 15:05:38,395 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:05:38,395 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:05:38,395 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:05:38,395 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:05:38,395 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:05:38,708 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:05:41,230 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '77891#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:05:41,230 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:05:41,230 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:05:41,230 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 54 [2022-12-14 15:05:41,230 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158099433] [2022-12-14 15:05:41,230 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:05:41,230 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-12-14 15:05:41,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:05:41,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-12-14 15:05:41,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=3839, Unknown=0, NotChecked=0, Total=4032 [2022-12-14 15:05:41,231 INFO L87 Difference]: Start difference. First operand 430 states and 488 transitions. Second operand has 54 states, 54 states have (on average 1.4259259259259258) internal successors, (77), 54 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:45,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:05:45,333 INFO L93 Difference]: Finished difference Result 682 states and 745 transitions. [2022-12-14 15:05:45,334 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-12-14 15:05:45,334 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.4259259259259258) internal successors, (77), 54 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2022-12-14 15:05:45,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:05:45,335 INFO L225 Difference]: With dead ends: 682 [2022-12-14 15:05:45,335 INFO L226 Difference]: Without dead ends: 667 [2022-12-14 15:05:45,335 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 51 SyntacticMatches, 10 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1230 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=606, Invalid=7584, Unknown=0, NotChecked=0, Total=8190 [2022-12-14 15:05:45,335 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 1368 mSDsluCounter, 2079 mSDsCounter, 0 mSdLazyCounter, 2822 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1368 SdHoareTripleChecker+Valid, 2149 SdHoareTripleChecker+Invalid, 2882 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 2822 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:05:45,336 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1368 Valid, 2149 Invalid, 2882 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 2822 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 15:05:45,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 667 states. [2022-12-14 15:05:45,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 667 to 435. [2022-12-14 15:05:45,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 435 states, 434 states have (on average 1.1359447004608294) internal successors, (493), 434 states have internal predecessors, (493), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:45,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 435 states to 435 states and 493 transitions. [2022-12-14 15:05:45,934 INFO L78 Accepts]: Start accepts. Automaton has 435 states and 493 transitions. Word has length 34 [2022-12-14 15:05:45,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:05:45,934 INFO L495 AbstractCegarLoop]: Abstraction has 435 states and 493 transitions. [2022-12-14 15:05:45,934 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.4259259259259258) internal successors, (77), 54 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:45,934 INFO L276 IsEmpty]: Start isEmpty. Operand 435 states and 493 transitions. [2022-12-14 15:05:45,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-12-14 15:05:45,935 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:05:45,935 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:05:45,939 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Ended with exit code 0 [2022-12-14 15:05:46,135 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:05:46,136 INFO L420 AbstractCegarLoop]: === Iteration 75 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:05:46,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:05:46,137 INFO L85 PathProgramCache]: Analyzing trace with hash 1865828158, now seen corresponding path program 68 times [2022-12-14 15:05:46,137 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:05:46,137 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [812312551] [2022-12-14 15:05:46,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:05:46,138 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:05:46,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:05:46,217 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-12-14 15:05:46,218 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:05:46,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [812312551] [2022-12-14 15:05:46,218 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [812312551] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:05:46,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [163397765] [2022-12-14 15:05:46,218 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:05:46,218 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:05:46,218 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:05:46,219 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:05:46,219 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2022-12-14 15:05:46,258 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 15:05:46,258 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:05:46,259 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 13 conjunts are in the unsatisfiable core [2022-12-14 15:05:46,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:05:46,319 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-12-14 15:05:46,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:05:46,363 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-12-14 15:05:46,363 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [163397765] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:05:46,363 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1040822668] [2022-12-14 15:05:46,364 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:05:46,364 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:05:46,364 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:05:46,364 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:05:46,364 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:05:46,696 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:05:48,429 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '80357#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:05:48,429 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:05:48,429 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:05:48,429 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2022-12-14 15:05:48,429 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084610231] [2022-12-14 15:05:48,430 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:05:48,430 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 15:05:48,430 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:05:48,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 15:05:48,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=827, Unknown=0, NotChecked=0, Total=992 [2022-12-14 15:05:48,430 INFO L87 Difference]: Start difference. First operand 435 states and 493 transitions. Second operand has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 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 15:05:49,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:05:49,717 INFO L93 Difference]: Finished difference Result 727 states and 834 transitions. [2022-12-14 15:05:49,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-12-14 15:05:49,718 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 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) Word has length 34 [2022-12-14 15:05:49,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:05:49,719 INFO L225 Difference]: With dead ends: 727 [2022-12-14 15:05:49,719 INFO L226 Difference]: Without dead ends: 626 [2022-12-14 15:05:49,719 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 73 SyntacticMatches, 11 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 680 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=370, Invalid=1700, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 15:05:49,719 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 263 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 277 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 263 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 283 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 277 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:05:49,719 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [263 Valid, 185 Invalid, 283 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 277 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:05:49,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 626 states. [2022-12-14 15:05:50,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 626 to 507. [2022-12-14 15:05:50,374 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 507 states, 506 states have (on average 1.1383399209486167) internal successors, (576), 506 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 15:05:50,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 507 states to 507 states and 576 transitions. [2022-12-14 15:05:50,374 INFO L78 Accepts]: Start accepts. Automaton has 507 states and 576 transitions. Word has length 34 [2022-12-14 15:05:50,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:05:50,374 INFO L495 AbstractCegarLoop]: Abstraction has 507 states and 576 transitions. [2022-12-14 15:05:50,374 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 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 15:05:50,374 INFO L276 IsEmpty]: Start isEmpty. Operand 507 states and 576 transitions. [2022-12-14 15:05:50,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2022-12-14 15:05:50,375 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:05:50,375 INFO L195 NwaCegarLoop]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:05:50,379 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Ended with exit code 0 [2022-12-14 15:05:50,575 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable74 [2022-12-14 15:05:50,576 INFO L420 AbstractCegarLoop]: === Iteration 76 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:05:50,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:05:50,577 INFO L85 PathProgramCache]: Analyzing trace with hash 905566393, now seen corresponding path program 69 times [2022-12-14 15:05:50,577 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:05:50,577 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [737733749] [2022-12-14 15:05:50,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:05:50,578 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:05:50,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:05:50,694 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-12-14 15:05:50,694 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:05:50,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [737733749] [2022-12-14 15:05:50,694 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [737733749] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:05:50,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1665176675] [2022-12-14 15:05:50,695 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:05:50,695 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:05:50,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:05:50,696 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:05:50,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2022-12-14 15:05:50,734 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:05:50,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:05:50,735 INFO L263 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 13 conjunts are in the unsatisfiable core [2022-12-14 15:05:50,735 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:05:50,819 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-12-14 15:05:50,820 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:05:50,877 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-12-14 15:05:50,877 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1665176675] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:05:50,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1131285277] [2022-12-14 15:05:50,878 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:05:50,878 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:05:50,878 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:05:50,878 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:05:50,878 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:05:51,210 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:05:52,899 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '83047#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:05:52,899 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:05:52,899 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:05:52,899 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 22 [2022-12-14 15:05:52,899 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009160021] [2022-12-14 15:05:52,899 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:05:52,900 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2022-12-14 15:05:52,900 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:05:52,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2022-12-14 15:05:52,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=809, Unknown=0, NotChecked=0, Total=992 [2022-12-14 15:05:52,900 INFO L87 Difference]: Start difference. First operand 507 states and 576 transitions. Second operand has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 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 15:05:54,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:05:54,096 INFO L93 Difference]: Finished difference Result 587 states and 664 transitions. [2022-12-14 15:05:54,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-12-14 15:05:54,096 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 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) Word has length 34 [2022-12-14 15:05:54,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:05:54,097 INFO L225 Difference]: With dead ends: 587 [2022-12-14 15:05:54,097 INFO L226 Difference]: Without dead ends: 574 [2022-12-14 15:05:54,098 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 73 SyntacticMatches, 11 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 688 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=388, Invalid=1682, Unknown=0, NotChecked=0, Total=2070 [2022-12-14 15:05:54,098 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 160 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:05:54,098 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [160 Valid, 129 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:05:54,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 574 states. [2022-12-14 15:05:54,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 574 to 540. [2022-12-14 15:05:54,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 540 states, 539 states have (on average 1.150278293135436) internal successors, (620), 539 states have internal predecessors, (620), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:05:54,822 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 540 states to 540 states and 620 transitions. [2022-12-14 15:05:54,822 INFO L78 Accepts]: Start accepts. Automaton has 540 states and 620 transitions. Word has length 34 [2022-12-14 15:05:54,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:05:54,823 INFO L495 AbstractCegarLoop]: Abstraction has 540 states and 620 transitions. [2022-12-14 15:05:54,823 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 22 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 15:05:54,823 INFO L276 IsEmpty]: Start isEmpty. Operand 540 states and 620 transitions. [2022-12-14 15:05:54,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 15:05:54,823 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:05:54,823 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:05:54,827 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Ended with exit code 0 [2022-12-14 15:05:55,024 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:05:55,024 INFO L420 AbstractCegarLoop]: === Iteration 77 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:05:55,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:05:55,025 INFO L85 PathProgramCache]: Analyzing trace with hash 1901151895, now seen corresponding path program 70 times [2022-12-14 15:05:55,025 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:05:55,026 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1343971928] [2022-12-14 15:05:55,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:05:55,026 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:05:55,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:05:55,448 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:05:55,448 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:05:55,448 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1343971928] [2022-12-14 15:05:55,449 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1343971928] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:05:55,449 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1208683060] [2022-12-14 15:05:55,449 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:05:55,449 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:05:55,449 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:05:55,450 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:05:55,450 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2022-12-14 15:05:55,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:05:55,489 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 66 conjunts are in the unsatisfiable core [2022-12-14 15:05:55,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:05:55,871 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:05:55,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:05:56,033 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:05:56,033 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1208683060] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:05:56,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [568296086] [2022-12-14 15:05:56,034 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:05:56,034 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:05:56,034 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:05:56,034 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:05:56,034 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:05:56,364 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:05:58,442 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '85554#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:05:58,442 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:05:58,442 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:05:58,442 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 47 [2022-12-14 15:05:58,442 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438624190] [2022-12-14 15:05:58,442 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:05:58,443 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-12-14 15:05:58,443 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:05:58,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-12-14 15:05:58,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=3034, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 15:05:58,443 INFO L87 Difference]: Start difference. First operand 540 states and 620 transitions. Second operand has 47 states, 47 states have (on average 1.2340425531914894) internal successors, (58), 47 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 15:06:02,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:06:02,689 INFO L93 Difference]: Finished difference Result 988 states and 1082 transitions. [2022-12-14 15:06:02,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-12-14 15:06:02,690 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.2340425531914894) internal successors, (58), 47 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 35 [2022-12-14 15:06:02,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:06:02,691 INFO L225 Difference]: With dead ends: 988 [2022-12-14 15:06:02,691 INFO L226 Difference]: Without dead ends: 982 [2022-12-14 15:06:02,692 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 75 SyntacticMatches, 3 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1422 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=351, Invalid=6959, Unknown=0, NotChecked=0, Total=7310 [2022-12-14 15:06:02,692 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 209 mSDsluCounter, 1465 mSDsCounter, 0 mSdLazyCounter, 3535 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 1524 SdHoareTripleChecker+Invalid, 3536 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3535 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:06:02,692 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [209 Valid, 1524 Invalid, 3536 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3535 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 15:06:02,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 982 states. [2022-12-14 15:06:03,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 982 to 546. [2022-12-14 15:06:03,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 546 states, 545 states have (on average 1.1504587155963302) internal successors, (627), 545 states have internal predecessors, (627), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:06:03,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 546 states to 546 states and 627 transitions. [2022-12-14 15:06:03,433 INFO L78 Accepts]: Start accepts. Automaton has 546 states and 627 transitions. Word has length 35 [2022-12-14 15:06:03,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:06:03,433 INFO L495 AbstractCegarLoop]: Abstraction has 546 states and 627 transitions. [2022-12-14 15:06:03,433 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.2340425531914894) internal successors, (58), 47 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 15:06:03,433 INFO L276 IsEmpty]: Start isEmpty. Operand 546 states and 627 transitions. [2022-12-14 15:06:03,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 15:06:03,434 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:06:03,434 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:06:03,438 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Ended with exit code 0 [2022-12-14 15:06:03,634 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable76,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:06:03,635 INFO L420 AbstractCegarLoop]: === Iteration 78 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:06:03,635 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:06:03,635 INFO L85 PathProgramCache]: Analyzing trace with hash 600250301, now seen corresponding path program 71 times [2022-12-14 15:06:03,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:06:03,635 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [590598166] [2022-12-14 15:06:03,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:06:03,635 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:06:03,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:06:04,032 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:06:04,032 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:06:04,032 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [590598166] [2022-12-14 15:06:04,033 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [590598166] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:06:04,033 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019431814] [2022-12-14 15:06:04,033 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:06:04,033 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:06:04,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:06:04,034 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:06:04,034 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2022-12-14 15:06:04,077 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 15:06:04,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:06:04,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 62 conjunts are in the unsatisfiable core [2022-12-14 15:06:04,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:06:04,255 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:06:04,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:06:04,534 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:06:04,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1019431814] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:06:04,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1524814601] [2022-12-14 15:06:04,535 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:06:04,535 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:06:04,535 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:06:04,535 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:06:04,535 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:06:04,870 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:06:07,109 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '88879#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:06:07,109 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:06:07,109 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:06:07,109 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 45 [2022-12-14 15:06:07,109 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590680940] [2022-12-14 15:06:07,109 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:06:07,109 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-12-14 15:06:07,109 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:06:07,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-12-14 15:06:07,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=2814, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 15:06:07,110 INFO L87 Difference]: Start difference. First operand 546 states and 627 transitions. Second operand has 45 states, 45 states have (on average 1.2666666666666666) internal successors, (57), 45 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 15:06:10,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:06:10,675 INFO L93 Difference]: Finished difference Result 837 states and 917 transitions. [2022-12-14 15:06:10,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-12-14 15:06:10,676 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.2666666666666666) internal successors, (57), 45 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 35 [2022-12-14 15:06:10,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:06:10,677 INFO L225 Difference]: With dead ends: 837 [2022-12-14 15:06:10,677 INFO L226 Difference]: Without dead ends: 815 [2022-12-14 15:06:10,677 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 69 SyntacticMatches, 9 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1021 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=325, Invalid=6155, Unknown=0, NotChecked=0, Total=6480 [2022-12-14 15:06:10,678 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 167 mSDsluCounter, 1080 mSDsCounter, 0 mSdLazyCounter, 2572 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 1128 SdHoareTripleChecker+Invalid, 2573 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2572 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 15:06:10,678 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [167 Valid, 1128 Invalid, 2573 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2572 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 15:06:10,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 815 states. [2022-12-14 15:06:11,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 815 to 540. [2022-12-14 15:06:11,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 540 states, 539 states have (on average 1.150278293135436) internal successors, (620), 539 states have internal predecessors, (620), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:06:11,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 540 states to 540 states and 620 transitions. [2022-12-14 15:06:11,414 INFO L78 Accepts]: Start accepts. Automaton has 540 states and 620 transitions. Word has length 35 [2022-12-14 15:06:11,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:06:11,414 INFO L495 AbstractCegarLoop]: Abstraction has 540 states and 620 transitions. [2022-12-14 15:06:11,414 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.2666666666666666) internal successors, (57), 45 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 15:06:11,414 INFO L276 IsEmpty]: Start isEmpty. Operand 540 states and 620 transitions. [2022-12-14 15:06:11,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 15:06:11,415 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:06:11,415 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:06:11,419 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Ended with exit code 0 [2022-12-14 15:06:11,615 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable77 [2022-12-14 15:06:11,616 INFO L420 AbstractCegarLoop]: === Iteration 79 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:06:11,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:06:11,617 INFO L85 PathProgramCache]: Analyzing trace with hash -2120970921, now seen corresponding path program 72 times [2022-12-14 15:06:11,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:06:11,617 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [453020120] [2022-12-14 15:06:11,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:06:11,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:06:11,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:06:11,997 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:06:11,997 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:06:11,997 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [453020120] [2022-12-14 15:06:11,998 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [453020120] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:06:11,998 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [211206193] [2022-12-14 15:06:11,998 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:06:11,998 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:06:11,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:06:11,999 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:06:11,999 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2022-12-14 15:06:12,037 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:06:12,037 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:06:12,039 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 58 conjunts are in the unsatisfiable core [2022-12-14 15:06:12,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:06:12,448 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:06:12,448 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:06:12,577 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:06:12,577 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [211206193] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:06:12,577 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1789115175] [2022-12-14 15:06:12,578 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:06:12,578 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:06:12,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:06:12,578 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:06:12,578 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:06:12,920 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:06:14,779 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '91894#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:06:14,779 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:06:14,779 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:06:14,779 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 43 [2022-12-14 15:06:14,779 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1387871214] [2022-12-14 15:06:14,779 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:06:14,780 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-12-14 15:06:14,780 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:06:14,780 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-12-14 15:06:14,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=2600, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 15:06:14,780 INFO L87 Difference]: Start difference. First operand 540 states and 620 transitions. Second operand has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:06:17,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:06:17,891 INFO L93 Difference]: Finished difference Result 723 states and 802 transitions. [2022-12-14 15:06:17,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2022-12-14 15:06:17,891 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2022-12-14 15:06:17,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:06:17,892 INFO L225 Difference]: With dead ends: 723 [2022-12-14 15:06:17,893 INFO L226 Difference]: Without dead ends: 700 [2022-12-14 15:06:17,893 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 73 SyntacticMatches, 5 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1171 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=321, Invalid=5531, Unknown=0, NotChecked=0, Total=5852 [2022-12-14 15:06:17,893 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 139 mSDsluCounter, 760 mSDsCounter, 0 mSdLazyCounter, 1973 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 796 SdHoareTripleChecker+Invalid, 1974 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1973 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 15:06:17,893 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 796 Invalid, 1974 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1973 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 15:06:17,894 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 700 states. [2022-12-14 15:06:18,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 700 to 532. [2022-12-14 15:06:18,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 531 states have (on average 1.1506591337099812) internal successors, (611), 531 states have internal predecessors, (611), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:06:18,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 611 transitions. [2022-12-14 15:06:18,625 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 611 transitions. Word has length 35 [2022-12-14 15:06:18,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:06:18,625 INFO L495 AbstractCegarLoop]: Abstraction has 532 states and 611 transitions. [2022-12-14 15:06:18,625 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:06:18,625 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 611 transitions. [2022-12-14 15:06:18,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 15:06:18,625 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:06:18,625 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:06:18,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Forceful destruction successful, exit code 0 [2022-12-14 15:06:18,826 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2022-12-14 15:06:18,827 INFO L420 AbstractCegarLoop]: === Iteration 80 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:06:18,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:06:18,827 INFO L85 PathProgramCache]: Analyzing trace with hash 356542717, now seen corresponding path program 73 times [2022-12-14 15:06:18,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:06:18,828 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [540554208] [2022-12-14 15:06:18,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:06:18,828 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:06:18,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:06:19,223 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:06:19,223 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:06:19,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [540554208] [2022-12-14 15:06:19,223 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [540554208] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:06:19,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [752121116] [2022-12-14 15:06:19,223 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:06:19,223 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:06:19,223 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:06:19,224 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:06:19,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2022-12-14 15:06:19,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:06:19,277 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 54 conjunts are in the unsatisfiable core [2022-12-14 15:06:19,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:06:19,541 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:06:19,542 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:06:19,758 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:06:19,758 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [752121116] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:06:19,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [190621845] [2022-12-14 15:06:19,759 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:06:19,759 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:06:19,759 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:06:19,759 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:06:19,759 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:06:20,110 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:06:22,118 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '94669#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:06:22,119 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:06:22,119 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:06:22,119 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 43 [2022-12-14 15:06:22,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376322448] [2022-12-14 15:06:22,119 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:06:22,119 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2022-12-14 15:06:22,119 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:06:22,119 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2022-12-14 15:06:22,120 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=2594, Unknown=0, NotChecked=0, Total=2756 [2022-12-14 15:06:22,120 INFO L87 Difference]: Start difference. First operand 532 states and 611 transitions. Second operand has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:06:24,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:06:24,575 INFO L93 Difference]: Finished difference Result 638 states and 716 transitions. [2022-12-14 15:06:24,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2022-12-14 15:06:24,576 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2022-12-14 15:06:24,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:06:24,577 INFO L225 Difference]: With dead ends: 638 [2022-12-14 15:06:24,577 INFO L226 Difference]: Without dead ends: 614 [2022-12-14 15:06:24,577 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 67 SyntacticMatches, 9 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1034 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=325, Invalid=5225, Unknown=0, NotChecked=0, Total=5550 [2022-12-14 15:06:24,577 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 105 mSDsluCounter, 577 mSDsCounter, 0 mSdLazyCounter, 1678 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 601 SdHoareTripleChecker+Invalid, 1679 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1678 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 15:06:24,577 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 601 Invalid, 1679 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1678 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 15:06:24,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 614 states. [2022-12-14 15:06:25,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 614 to 522. [2022-12-14 15:06:25,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 522 states, 521 states have (on average 1.1516314779270633) internal successors, (600), 521 states have internal predecessors, (600), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:06:25,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 522 states to 522 states and 600 transitions. [2022-12-14 15:06:25,290 INFO L78 Accepts]: Start accepts. Automaton has 522 states and 600 transitions. Word has length 35 [2022-12-14 15:06:25,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:06:25,290 INFO L495 AbstractCegarLoop]: Abstraction has 522 states and 600 transitions. [2022-12-14 15:06:25,290 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.2790697674418605) internal successors, (55), 43 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:06:25,290 INFO L276 IsEmpty]: Start isEmpty. Operand 522 states and 600 transitions. [2022-12-14 15:06:25,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 15:06:25,290 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:06:25,290 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:06:25,294 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Ended with exit code 0 [2022-12-14 15:06:25,491 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79,77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:06:25,492 INFO L420 AbstractCegarLoop]: === Iteration 81 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:06:25,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:06:25,492 INFO L85 PathProgramCache]: Analyzing trace with hash -1670275128, now seen corresponding path program 74 times [2022-12-14 15:06:25,493 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:06:25,493 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821312081] [2022-12-14 15:06:25,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:06:25,493 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:06:25,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:06:25,674 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-12-14 15:06:25,674 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:06:25,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1821312081] [2022-12-14 15:06:25,675 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1821312081] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:06:25,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [405686585] [2022-12-14 15:06:25,675 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:06:25,675 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:06:25,675 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:06:25,675 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:06:25,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2022-12-14 15:06:25,717 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 15:06:25,717 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:06:25,718 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 15:06:25,720 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:06:25,996 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2022-12-14 15:06:25,997 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:06:26,280 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2022-12-14 15:06:26,281 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [405686585] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:06:26,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1259873882] [2022-12-14 15:06:26,281 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:06:26,282 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:06:26,282 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:06:26,282 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:06:26,282 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:06:26,619 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:06:29,092 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '97250#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:06:29,092 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:06:29,092 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:06:29,092 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 35 [2022-12-14 15:06:29,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400161759] [2022-12-14 15:06:29,092 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:06:29,093 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 15:06:29,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:06:29,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 15:06:29,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=1836, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 15:06:29,093 INFO L87 Difference]: Start difference. First operand 522 states and 600 transitions. Second operand has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:06:32,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:06:32,046 INFO L93 Difference]: Finished difference Result 687 states and 781 transitions. [2022-12-14 15:06:32,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-12-14 15:06:32,047 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2022-12-14 15:06:32,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:06:32,048 INFO L225 Difference]: With dead ends: 687 [2022-12-14 15:06:32,048 INFO L226 Difference]: Without dead ends: 631 [2022-12-14 15:06:32,048 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 70 SyntacticMatches, 6 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1117 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=1083, Invalid=5237, Unknown=0, NotChecked=0, Total=6320 [2022-12-14 15:06:32,048 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 811 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 573 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 811 SdHoareTripleChecker+Valid, 342 SdHoareTripleChecker+Invalid, 599 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 573 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:06:32,049 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [811 Valid, 342 Invalid, 599 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 573 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:06:32,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 631 states. [2022-12-14 15:06:32,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 631 to 570. [2022-12-14 15:06:32,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 570 states, 569 states have (on average 1.1370826010544814) internal successors, (647), 569 states have internal predecessors, (647), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:06:32,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 570 states to 570 states and 647 transitions. [2022-12-14 15:06:32,858 INFO L78 Accepts]: Start accepts. Automaton has 570 states and 647 transitions. Word has length 35 [2022-12-14 15:06:32,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:06:32,858 INFO L495 AbstractCegarLoop]: Abstraction has 570 states and 647 transitions. [2022-12-14 15:06:32,858 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:06:32,858 INFO L276 IsEmpty]: Start isEmpty. Operand 570 states and 647 transitions. [2022-12-14 15:06:32,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 15:06:32,859 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:06:32,859 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:06:32,863 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Ended with exit code 0 [2022-12-14 15:06:33,059 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:06:33,060 INFO L420 AbstractCegarLoop]: === Iteration 82 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:06:33,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:06:33,061 INFO L85 PathProgramCache]: Analyzing trace with hash 1819911191, now seen corresponding path program 75 times [2022-12-14 15:06:33,061 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:06:33,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2068946318] [2022-12-14 15:06:33,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:06:33,062 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:06:33,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:06:33,377 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:06:33,377 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:06:33,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2068946318] [2022-12-14 15:06:33,377 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2068946318] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:06:33,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066846044] [2022-12-14 15:06:33,377 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:06:33,377 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:06:33,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:06:33,378 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:06:33,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2022-12-14 15:06:33,416 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:06:33,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:06:33,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 50 conjunts are in the unsatisfiable core [2022-12-14 15:06:33,418 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:06:33,788 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:06:33,788 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:06:33,930 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:06:33,930 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2066846044] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:06:33,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1817334989] [2022-12-14 15:06:33,931 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:06:33,931 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:06:33,931 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:06:33,932 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:06:33,932 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:06:34,263 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:06:36,777 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '100051#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:06:36,777 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:06:36,777 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:06:36,777 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 39 [2022-12-14 15:06:36,777 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [323218846] [2022-12-14 15:06:36,777 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:06:36,777 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2022-12-14 15:06:36,777 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:06:36,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2022-12-14 15:06:36,778 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=2198, Unknown=0, NotChecked=0, Total=2352 [2022-12-14 15:06:36,778 INFO L87 Difference]: Start difference. First operand 570 states and 647 transitions. Second operand has 39 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 39 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 15:06:38,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:06:38,741 INFO L93 Difference]: Finished difference Result 647 states and 727 transitions. [2022-12-14 15:06:38,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2022-12-14 15:06:38,741 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 39 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) Word has length 35 [2022-12-14 15:06:38,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:06:38,742 INFO L225 Difference]: With dead ends: 647 [2022-12-14 15:06:38,742 INFO L226 Difference]: Without dead ends: 622 [2022-12-14 15:06:38,743 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 73 SyntacticMatches, 5 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 985 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=311, Invalid=4381, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 15:06:38,743 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 83 mSDsluCounter, 326 mSDsCounter, 0 mSdLazyCounter, 915 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 341 SdHoareTripleChecker+Invalid, 916 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 915 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 15:06:38,743 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [83 Valid, 341 Invalid, 916 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 915 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 15:06:38,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 622 states. [2022-12-14 15:06:39,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 622 to 567. [2022-12-14 15:06:39,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 567 states, 566 states have (on average 1.1395759717314489) internal successors, (645), 566 states have internal predecessors, (645), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:06:39,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 567 states to 567 states and 645 transitions. [2022-12-14 15:06:39,541 INFO L78 Accepts]: Start accepts. Automaton has 567 states and 645 transitions. Word has length 35 [2022-12-14 15:06:39,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:06:39,541 INFO L495 AbstractCegarLoop]: Abstraction has 567 states and 645 transitions. [2022-12-14 15:06:39,541 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 39 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 15:06:39,541 INFO L276 IsEmpty]: Start isEmpty. Operand 567 states and 645 transitions. [2022-12-14 15:06:39,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-12-14 15:06:39,541 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:06:39,542 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:06:39,546 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Ended with exit code 0 [2022-12-14 15:06:39,742 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable81,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:06:39,743 INFO L420 AbstractCegarLoop]: === Iteration 83 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:06:39,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:06:39,744 INFO L85 PathProgramCache]: Analyzing trace with hash 934307314, now seen corresponding path program 76 times [2022-12-14 15:06:39,744 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:06:39,744 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790501549] [2022-12-14 15:06:39,745 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:06:39,745 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:06:39,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:06:39,976 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 37 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2022-12-14 15:06:39,976 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:06:39,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790501549] [2022-12-14 15:06:39,976 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [790501549] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:06:39,976 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1717590530] [2022-12-14 15:06:39,976 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:06:39,976 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:06:39,976 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:06:39,977 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:06:39,977 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2022-12-14 15:06:40,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:06:40,021 INFO L263 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 22 conjunts are in the unsatisfiable core [2022-12-14 15:06:40,021 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:06:40,228 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2022-12-14 15:06:40,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:06:40,430 INFO L134 CoverageAnalysis]: Checked inductivity of 74 backedges. 6 proven. 30 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2022-12-14 15:06:40,430 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1717590530] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:06:40,430 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1486643746] [2022-12-14 15:06:40,431 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:06:40,431 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:06:40,431 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:06:40,431 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:06:40,431 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:06:40,767 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:06:42,818 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '102740#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:06:42,818 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:06:42,818 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:06:42,818 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15, 15] total 35 [2022-12-14 15:06:42,818 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779960094] [2022-12-14 15:06:42,819 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:06:42,819 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-12-14 15:06:42,819 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:06:42,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-12-14 15:06:42,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=1836, Unknown=0, NotChecked=0, Total=1980 [2022-12-14 15:06:42,819 INFO L87 Difference]: Start difference. First operand 567 states and 645 transitions. Second operand has 35 states, 35 states have (on average 1.457142857142857) internal successors, (51), 35 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 15:06:44,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:06:44,845 INFO L93 Difference]: Finished difference Result 632 states and 705 transitions. [2022-12-14 15:06:44,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-12-14 15:06:44,846 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.457142857142857) internal successors, (51), 35 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) Word has length 35 [2022-12-14 15:06:44,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:06:44,847 INFO L225 Difference]: With dead ends: 632 [2022-12-14 15:06:44,847 INFO L226 Difference]: Without dead ends: 601 [2022-12-14 15:06:44,847 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 70 SyntacticMatches, 6 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 567 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=342, Invalid=3318, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 15:06:44,847 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 625 mSDsluCounter, 726 mSDsCounter, 0 mSdLazyCounter, 1243 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 625 SdHoareTripleChecker+Valid, 768 SdHoareTripleChecker+Invalid, 1267 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 1243 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 15:06:44,847 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [625 Valid, 768 Invalid, 1267 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 1243 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 15:06:44,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2022-12-14 15:06:45,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 567. [2022-12-14 15:06:45,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 567 states, 566 states have (on average 1.1219081272084805) internal successors, (635), 566 states have internal predecessors, (635), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:06:45,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 567 states to 567 states and 635 transitions. [2022-12-14 15:06:45,678 INFO L78 Accepts]: Start accepts. Automaton has 567 states and 635 transitions. Word has length 35 [2022-12-14 15:06:45,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:06:45,678 INFO L495 AbstractCegarLoop]: Abstraction has 567 states and 635 transitions. [2022-12-14 15:06:45,678 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.457142857142857) internal successors, (51), 35 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 15:06:45,678 INFO L276 IsEmpty]: Start isEmpty. Operand 567 states and 635 transitions. [2022-12-14 15:06:45,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-12-14 15:06:45,678 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:06:45,678 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:06:45,682 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Ended with exit code 0 [2022-12-14 15:06:45,879 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:06:45,879 INFO L420 AbstractCegarLoop]: === Iteration 84 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:06:45,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:06:45,879 INFO L85 PathProgramCache]: Analyzing trace with hash -730985225, now seen corresponding path program 77 times [2022-12-14 15:06:45,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:06:45,879 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [284180490] [2022-12-14 15:06:45,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:06:45,880 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:06:45,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:06:46,197 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:06:46,197 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:06:46,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [284180490] [2022-12-14 15:06:46,197 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [284180490] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:06:46,197 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1253815992] [2022-12-14 15:06:46,197 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:06:46,198 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:06:46,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:06:46,198 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:06:46,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2022-12-14 15:06:46,241 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 15:06:46,241 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:06:46,242 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 15:06:46,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:06:46,952 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:06:46,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:06:47,451 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:06:47,451 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1253815992] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:06:47,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1138636280] [2022-12-14 15:06:47,451 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:06:47,451 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:06:47,452 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:06:47,452 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:06:47,452 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:06:47,802 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:06:50,203 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '105413#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:06:50,204 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:06:50,204 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:06:50,204 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 59 [2022-12-14 15:06:50,204 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118601627] [2022-12-14 15:06:50,204 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:06:50,204 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-12-14 15:06:50,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:06:50,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-12-14 15:06:50,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=4485, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 15:06:50,205 INFO L87 Difference]: Start difference. First operand 567 states and 635 transitions. Second operand has 59 states, 59 states have (on average 1.3898305084745763) internal successors, (82), 59 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:06:59,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:06:59,807 INFO L93 Difference]: Finished difference Result 989 states and 1075 transitions. [2022-12-14 15:06:59,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2022-12-14 15:06:59,808 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.3898305084745763) internal successors, (82), 59 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-12-14 15:06:59,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:06:59,810 INFO L225 Difference]: With dead ends: 989 [2022-12-14 15:06:59,810 INFO L226 Difference]: Without dead ends: 952 [2022-12-14 15:06:59,811 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 53 SyntacticMatches, 11 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5345 ImplicationChecksByTransitivity, 9.6s TimeCoverageRelationStatistics Valid=4733, Invalid=21673, Unknown=0, NotChecked=0, Total=26406 [2022-12-14 15:06:59,811 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 1777 mSDsluCounter, 912 mSDsCounter, 0 mSdLazyCounter, 2120 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1777 SdHoareTripleChecker+Valid, 957 SdHoareTripleChecker+Invalid, 2188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 2120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-12-14 15:06:59,811 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1777 Valid, 957 Invalid, 2188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 2120 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-12-14 15:06:59,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 952 states. [2022-12-14 15:07:00,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 952 to 621. [2022-12-14 15:07:00,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 621 states, 620 states have (on average 1.1209677419354838) internal successors, (695), 620 states have internal predecessors, (695), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:07:00,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 621 states to 621 states and 695 transitions. [2022-12-14 15:07:00,728 INFO L78 Accepts]: Start accepts. Automaton has 621 states and 695 transitions. Word has length 36 [2022-12-14 15:07:00,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:07:00,728 INFO L495 AbstractCegarLoop]: Abstraction has 621 states and 695 transitions. [2022-12-14 15:07:00,728 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.3898305084745763) internal successors, (82), 59 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:07:00,728 INFO L276 IsEmpty]: Start isEmpty. Operand 621 states and 695 transitions. [2022-12-14 15:07:00,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-12-14 15:07:00,729 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:07:00,729 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:07:00,733 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Forceful destruction successful, exit code 0 [2022-12-14 15:07:00,930 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable83 [2022-12-14 15:07:00,930 INFO L420 AbstractCegarLoop]: === Iteration 85 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:07:00,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:07:00,930 INFO L85 PathProgramCache]: Analyzing trace with hash 1927885444, now seen corresponding path program 78 times [2022-12-14 15:07:00,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:07:00,930 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159490535] [2022-12-14 15:07:00,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:07:00,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:07:00,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:07:01,322 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:07:01,322 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:07:01,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [159490535] [2022-12-14 15:07:01,322 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [159490535] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:07:01,322 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [301295089] [2022-12-14 15:07:01,322 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:07:01,322 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:07:01,323 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:07:01,323 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:07:01,324 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2022-12-14 15:07:01,376 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:07:01,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:07:01,378 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 32 conjunts are in the unsatisfiable core [2022-12-14 15:07:01,379 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:07:02,017 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:07:02,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:07:02,676 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 11 proven. 110 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:07:02,676 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [301295089] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:07:02,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1898207852] [2022-12-14 15:07:02,676 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:07:02,677 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:07:02,677 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:07:02,677 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:07:02,677 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:07:03,040 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:07:05,662 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '109044#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:07:05,662 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:07:05,662 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:07:05,662 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 59 [2022-12-14 15:07:05,663 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1649391956] [2022-12-14 15:07:05,663 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:07:05,663 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-12-14 15:07:05,663 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:07:05,663 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-12-14 15:07:05,664 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=4485, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 15:07:05,664 INFO L87 Difference]: Start difference. First operand 621 states and 695 transitions. Second operand has 59 states, 59 states have (on average 1.3898305084745763) internal successors, (82), 59 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:07:11,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:07:11,573 INFO L93 Difference]: Finished difference Result 974 states and 1054 transitions. [2022-12-14 15:07:11,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-12-14 15:07:11,574 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.3898305084745763) internal successors, (82), 59 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2022-12-14 15:07:11,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:07:11,575 INFO L225 Difference]: With dead ends: 974 [2022-12-14 15:07:11,575 INFO L226 Difference]: Without dead ends: 958 [2022-12-14 15:07:11,576 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 53 SyntacticMatches, 11 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1456 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=696, Invalid=9006, Unknown=0, NotChecked=0, Total=9702 [2022-12-14 15:07:11,576 INFO L413 NwaCegarLoop]: 77 mSDtfsCounter, 1482 mSDsluCounter, 2484 mSDsCounter, 0 mSdLazyCounter, 3408 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1482 SdHoareTripleChecker+Valid, 2561 SdHoareTripleChecker+Invalid, 3481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 3408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:07:11,576 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1482 Valid, 2561 Invalid, 3481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 3408 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-12-14 15:07:11,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 958 states. [2022-12-14 15:07:12,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 958 to 627. [2022-12-14 15:07:12,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 627 states, 626 states have (on average 1.1198083067092652) internal successors, (701), 626 states have internal predecessors, (701), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:07:12,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 627 states to 627 states and 701 transitions. [2022-12-14 15:07:12,531 INFO L78 Accepts]: Start accepts. Automaton has 627 states and 701 transitions. Word has length 36 [2022-12-14 15:07:12,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:07:12,531 INFO L495 AbstractCegarLoop]: Abstraction has 627 states and 701 transitions. [2022-12-14 15:07:12,532 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.3898305084745763) internal successors, (82), 59 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:07:12,532 INFO L276 IsEmpty]: Start isEmpty. Operand 627 states and 701 transitions. [2022-12-14 15:07:12,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-12-14 15:07:12,532 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:07:12,532 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:07:12,536 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Ended with exit code 0 [2022-12-14 15:07:12,733 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:07:12,733 INFO L420 AbstractCegarLoop]: === Iteration 86 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:07:12,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:07:12,734 INFO L85 PathProgramCache]: Analyzing trace with hash -149860685, now seen corresponding path program 79 times [2022-12-14 15:07:12,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:07:12,735 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1108736473] [2022-12-14 15:07:12,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:07:12,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:07:12,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:07:12,872 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-12-14 15:07:12,872 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:07:12,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1108736473] [2022-12-14 15:07:12,872 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1108736473] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:07:12,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1362568724] [2022-12-14 15:07:12,872 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:07:12,873 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:07:12,873 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:07:12,873 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:07:12,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2022-12-14 15:07:12,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:07:12,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 15:07:12,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:07:12,998 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-12-14 15:07:12,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:07:13,059 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-12-14 15:07:13,059 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1362568724] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:07:13,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1546435539] [2022-12-14 15:07:13,060 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:07:13,060 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:07:13,060 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:07:13,060 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:07:13,060 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:07:13,384 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:07:15,000 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '112493#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:07:15,000 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:07:15,000 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:07:15,000 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2022-12-14 15:07:15,000 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1573414321] [2022-12-14 15:07:15,000 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:07:15,000 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-12-14 15:07:15,000 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:07:15,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-12-14 15:07:15,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=830, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 15:07:15,001 INFO L87 Difference]: Start difference. First operand 627 states and 701 transitions. Second operand has 23 states, 23 states have (on average 1.608695652173913) internal successors, (37), 23 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 15:07:16,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:07:16,608 INFO L93 Difference]: Finished difference Result 671 states and 740 transitions. [2022-12-14 15:07:16,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-12-14 15:07:16,608 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.608695652173913) internal successors, (37), 23 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) Word has length 36 [2022-12-14 15:07:16,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:07:16,609 INFO L225 Difference]: With dead ends: 671 [2022-12-14 15:07:16,610 INFO L226 Difference]: Without dead ends: 667 [2022-12-14 15:07:16,610 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 78 SyntacticMatches, 12 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 938 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=536, Invalid=1720, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 15:07:16,610 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 72 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 195 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 195 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:07:16,610 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 135 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 195 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:07:16,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 667 states. [2022-12-14 15:07:17,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 667 to 608. [2022-12-14 15:07:17,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 608 states, 607 states have (on average 1.1169686985172982) internal successors, (678), 607 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 15:07:17,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 608 states to 608 states and 678 transitions. [2022-12-14 15:07:17,532 INFO L78 Accepts]: Start accepts. Automaton has 608 states and 678 transitions. Word has length 36 [2022-12-14 15:07:17,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:07:17,532 INFO L495 AbstractCegarLoop]: Abstraction has 608 states and 678 transitions. [2022-12-14 15:07:17,533 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.608695652173913) internal successors, (37), 23 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 15:07:17,533 INFO L276 IsEmpty]: Start isEmpty. Operand 608 states and 678 transitions. [2022-12-14 15:07:17,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-12-14 15:07:17,533 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:07:17,533 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:07:17,537 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Ended with exit code 0 [2022-12-14 15:07:17,734 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable85 [2022-12-14 15:07:17,734 INFO L420 AbstractCegarLoop]: === Iteration 87 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:07:17,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:07:17,735 INFO L85 PathProgramCache]: Analyzing trace with hash -482650220, now seen corresponding path program 80 times [2022-12-14 15:07:17,735 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:07:17,736 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1520832212] [2022-12-14 15:07:17,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:07:17,736 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:07:17,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:07:17,884 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-12-14 15:07:17,884 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:07:17,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1520832212] [2022-12-14 15:07:17,884 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1520832212] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:07:17,884 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1420706754] [2022-12-14 15:07:17,884 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:07:17,885 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:07:17,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:07:17,885 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:07:17,886 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2022-12-14 15:07:17,926 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 15:07:17,926 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:07:17,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 14 conjunts are in the unsatisfiable core [2022-12-14 15:07:17,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:07:18,014 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-12-14 15:07:18,014 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:07:18,078 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-12-14 15:07:18,078 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1420706754] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:07:18,078 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [787205447] [2022-12-14 15:07:18,079 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:07:18,079 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:07:18,079 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:07:18,079 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:07:18,079 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:07:18,409 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:07:19,969 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '115288#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:07:19,969 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:07:19,969 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:07:19,969 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2022-12-14 15:07:19,969 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521776180] [2022-12-14 15:07:19,970 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:07:19,970 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2022-12-14 15:07:19,970 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:07:19,970 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2022-12-14 15:07:19,970 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=827, Unknown=0, NotChecked=0, Total=1056 [2022-12-14 15:07:19,970 INFO L87 Difference]: Start difference. First operand 608 states and 678 transitions. Second operand has 23 states, 23 states have (on average 1.608695652173913) internal successors, (37), 23 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 15:07:21,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:07:21,411 INFO L93 Difference]: Finished difference Result 764 states and 852 transitions. [2022-12-14 15:07:21,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-12-14 15:07:21,412 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.608695652173913) internal successors, (37), 23 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) Word has length 36 [2022-12-14 15:07:21,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:07:21,413 INFO L225 Difference]: With dead ends: 764 [2022-12-14 15:07:21,413 INFO L226 Difference]: Without dead ends: 653 [2022-12-14 15:07:21,413 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 78 SyntacticMatches, 12 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 935 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=539, Invalid=1717, Unknown=0, NotChecked=0, Total=2256 [2022-12-14 15:07:21,413 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 111 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 372 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 356 SdHoareTripleChecker+Invalid, 379 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 372 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:07:21,413 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [111 Valid, 356 Invalid, 379 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 372 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:07:21,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 653 states. [2022-12-14 15:07:22,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 653 to 619. [2022-12-14 15:07:22,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 619 states, 618 states have (on average 1.1148867313915858) internal successors, (689), 618 states have internal predecessors, (689), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:07:22,353 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 619 states to 619 states and 689 transitions. [2022-12-14 15:07:22,353 INFO L78 Accepts]: Start accepts. Automaton has 619 states and 689 transitions. Word has length 36 [2022-12-14 15:07:22,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:07:22,353 INFO L495 AbstractCegarLoop]: Abstraction has 619 states and 689 transitions. [2022-12-14 15:07:22,353 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.608695652173913) internal successors, (37), 23 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 15:07:22,353 INFO L276 IsEmpty]: Start isEmpty. Operand 619 states and 689 transitions. [2022-12-14 15:07:22,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-12-14 15:07:22,354 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:07:22,354 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:07:22,358 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Ended with exit code 0 [2022-12-14 15:07:22,555 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable86,84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:07:22,555 INFO L420 AbstractCegarLoop]: === Iteration 88 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:07:22,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:07:22,556 INFO L85 PathProgramCache]: Analyzing trace with hash 97754794, now seen corresponding path program 81 times [2022-12-14 15:07:22,556 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:07:22,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988476925] [2022-12-14 15:07:22,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:07:22,557 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:07:22,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:07:23,001 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 134 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:07:23,001 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:07:23,001 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988476925] [2022-12-14 15:07:23,001 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988476925] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:07:23,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [219434398] [2022-12-14 15:07:23,002 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:07:23,002 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:07:23,002 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:07:23,003 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:07:23,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2022-12-14 15:07:23,047 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:07:23,047 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:07:23,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 70 conjunts are in the unsatisfiable core [2022-12-14 15:07:23,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:07:23,409 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 134 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:07:23,409 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:07:23,538 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 134 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:07:23,538 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [219434398] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:07:23,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [872666794] [2022-12-14 15:07:23,539 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:07:23,539 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:07:23,539 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:07:23,539 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:07:23,539 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:07:23,866 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:07:25,985 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '118324#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:07:25,985 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:07:25,985 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:07:25,985 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 50 [2022-12-14 15:07:25,985 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2106080933] [2022-12-14 15:07:25,985 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:07:25,985 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-12-14 15:07:25,985 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:07:25,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-12-14 15:07:25,986 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=3375, Unknown=0, NotChecked=0, Total=3540 [2022-12-14 15:07:25,986 INFO L87 Difference]: Start difference. First operand 619 states and 689 transitions. Second operand has 50 states, 50 states have (on average 1.22) internal successors, (61), 50 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 15:07:30,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:07:30,957 INFO L93 Difference]: Finished difference Result 1119 states and 1202 transitions. [2022-12-14 15:07:30,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-12-14 15:07:30,958 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.22) internal successors, (61), 50 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2022-12-14 15:07:30,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:07:30,960 INFO L225 Difference]: With dead ends: 1119 [2022-12-14 15:07:30,960 INFO L226 Difference]: Without dead ends: 1113 [2022-12-14 15:07:30,961 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 80 SyntacticMatches, 3 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1587 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=369, Invalid=7821, Unknown=0, NotChecked=0, Total=8190 [2022-12-14 15:07:30,961 INFO L413 NwaCegarLoop]: 65 mSDtfsCounter, 224 mSDsluCounter, 1848 mSDsCounter, 0 mSdLazyCounter, 4582 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 224 SdHoareTripleChecker+Valid, 1913 SdHoareTripleChecker+Invalid, 4583 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 4582 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:07:30,961 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [224 Valid, 1913 Invalid, 4583 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 4582 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-12-14 15:07:30,962 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1113 states. [2022-12-14 15:07:31,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1113 to 625. [2022-12-14 15:07:31,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 625 states, 624 states have (on average 1.1153846153846154) internal successors, (696), 624 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 15:07:31,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 625 states to 625 states and 696 transitions. [2022-12-14 15:07:31,913 INFO L78 Accepts]: Start accepts. Automaton has 625 states and 696 transitions. Word has length 37 [2022-12-14 15:07:31,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:07:31,913 INFO L495 AbstractCegarLoop]: Abstraction has 625 states and 696 transitions. [2022-12-14 15:07:31,913 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.22) internal successors, (61), 50 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 15:07:31,913 INFO L276 IsEmpty]: Start isEmpty. Operand 625 states and 696 transitions. [2022-12-14 15:07:31,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-12-14 15:07:31,913 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:07:31,913 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:07:31,918 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Forceful destruction successful, exit code 0 [2022-12-14 15:07:32,114 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87,85 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:07:32,115 INFO L420 AbstractCegarLoop]: === Iteration 89 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:07:32,115 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:07:32,116 INFO L85 PathProgramCache]: Analyzing trace with hash 785872368, now seen corresponding path program 82 times [2022-12-14 15:07:32,116 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:07:32,116 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636333370] [2022-12-14 15:07:32,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:07:32,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:07:32,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:07:32,523 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 96 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:07:32,524 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:07:32,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1636333370] [2022-12-14 15:07:32,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1636333370] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:07:32,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [960359529] [2022-12-14 15:07:32,524 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:07:32,524 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:07:32,524 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:07:32,525 INFO L229 MonitoredProcess]: Starting monitored process 86 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:07:32,526 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Waiting until timeout for monitored process [2022-12-14 15:07:32,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:07:32,566 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 66 conjunts are in the unsatisfiable core [2022-12-14 15:07:32,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:07:32,972 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 96 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:07:32,973 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:07:33,129 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 96 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:07:33,130 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [960359529] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:07:33,130 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1012490598] [2022-12-14 15:07:33,130 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:07:33,130 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:07:33,131 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:07:33,131 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:07:33,131 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:07:33,479 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:07:35,471 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '122084#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:07:35,472 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:07:35,472 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:07:35,472 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 48 [2022-12-14 15:07:35,472 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010897583] [2022-12-14 15:07:35,472 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:07:35,472 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-12-14 15:07:35,472 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:07:35,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-12-14 15:07:35,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=3142, Unknown=0, NotChecked=0, Total=3306 [2022-12-14 15:07:35,473 INFO L87 Difference]: Start difference. First operand 625 states and 696 transitions. Second operand has 48 states, 48 states have (on average 1.25) internal successors, (60), 48 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:07:40,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:07:40,444 INFO L93 Difference]: Finished difference Result 953 states and 1023 transitions. [2022-12-14 15:07:40,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-12-14 15:07:40,444 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.25) internal successors, (60), 48 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2022-12-14 15:07:40,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:07:40,446 INFO L225 Difference]: With dead ends: 953 [2022-12-14 15:07:40,446 INFO L226 Difference]: Without dead ends: 930 [2022-12-14 15:07:40,446 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 78 SyntacticMatches, 5 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1426 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=343, Invalid=6967, Unknown=0, NotChecked=0, Total=7310 [2022-12-14 15:07:40,446 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 184 mSDsluCounter, 1349 mSDsCounter, 0 mSdLazyCounter, 3242 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 1404 SdHoareTripleChecker+Invalid, 3243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3242 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:07:40,447 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [184 Valid, 1404 Invalid, 3243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3242 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-12-14 15:07:40,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 930 states. [2022-12-14 15:07:41,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 930 to 619. [2022-12-14 15:07:41,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 619 states, 618 states have (on average 1.1148867313915858) internal successors, (689), 618 states have internal predecessors, (689), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:07:41,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 619 states to 619 states and 689 transitions. [2022-12-14 15:07:41,396 INFO L78 Accepts]: Start accepts. Automaton has 619 states and 689 transitions. Word has length 37 [2022-12-14 15:07:41,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:07:41,396 INFO L495 AbstractCegarLoop]: Abstraction has 619 states and 689 transitions. [2022-12-14 15:07:41,396 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.25) internal successors, (60), 48 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:07:41,396 INFO L276 IsEmpty]: Start isEmpty. Operand 619 states and 689 transitions. [2022-12-14 15:07:41,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-12-14 15:07:41,397 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:07:41,397 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:07:41,401 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (86)] Ended with exit code 0 [2022-12-14 15:07:41,597 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 86 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable88 [2022-12-14 15:07:41,598 INFO L420 AbstractCegarLoop]: === Iteration 90 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:07:41,598 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:07:41,599 INFO L85 PathProgramCache]: Analyzing trace with hash 1353651434, now seen corresponding path program 83 times [2022-12-14 15:07:41,599 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:07:41,599 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172425174] [2022-12-14 15:07:41,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:07:41,600 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:07:41,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:07:42,036 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:07:42,036 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:07:42,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172425174] [2022-12-14 15:07:42,036 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172425174] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:07:42,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2022985725] [2022-12-14 15:07:42,036 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:07:42,036 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:07:42,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:07:42,037 INFO L229 MonitoredProcess]: Starting monitored process 87 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:07:42,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Waiting until timeout for monitored process [2022-12-14 15:07:42,094 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 15:07:42,094 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:07:42,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 62 conjunts are in the unsatisfiable core [2022-12-14 15:07:42,097 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:07:42,466 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:07:42,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:07:42,600 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 68 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:07:42,600 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2022985725] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:07:42,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [592370800] [2022-12-14 15:07:42,600 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:07:42,600 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:07:42,601 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:07:42,601 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:07:42,601 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:07:42,965 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:07:45,115 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '125504#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:07:45,115 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:07:45,115 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:07:45,115 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 46 [2022-12-14 15:07:45,115 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620509855] [2022-12-14 15:07:45,115 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:07:45,116 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-12-14 15:07:45,116 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:07:45,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-12-14 15:07:45,116 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=2917, Unknown=0, NotChecked=0, Total=3080 [2022-12-14 15:07:45,116 INFO L87 Difference]: Start difference. First operand 619 states and 689 transitions. Second operand has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 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 15:07:49,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:07:49,243 INFO L93 Difference]: Finished difference Result 828 states and 897 transitions. [2022-12-14 15:07:49,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-12-14 15:07:49,244 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 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 37 [2022-12-14 15:07:49,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:07:49,245 INFO L225 Difference]: With dead ends: 828 [2022-12-14 15:07:49,245 INFO L226 Difference]: Without dead ends: 804 [2022-12-14 15:07:49,246 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 78 SyntacticMatches, 5 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1321 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=338, Invalid=6304, Unknown=0, NotChecked=0, Total=6642 [2022-12-14 15:07:49,246 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 150 mSDsluCounter, 1052 mSDsCounter, 0 mSdLazyCounter, 2763 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 1095 SdHoareTripleChecker+Invalid, 2764 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2763 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-12-14 15:07:49,246 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 1095 Invalid, 2764 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2763 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-12-14 15:07:49,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 804 states. [2022-12-14 15:07:50,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 804 to 611. [2022-12-14 15:07:50,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 611 states, 610 states have (on average 1.1147540983606556) internal successors, (680), 610 states have internal predecessors, (680), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:07:50,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 611 states to 611 states and 680 transitions. [2022-12-14 15:07:50,184 INFO L78 Accepts]: Start accepts. Automaton has 611 states and 680 transitions. Word has length 37 [2022-12-14 15:07:50,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:07:50,184 INFO L495 AbstractCegarLoop]: Abstraction has 611 states and 680 transitions. [2022-12-14 15:07:50,184 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 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 15:07:50,184 INFO L276 IsEmpty]: Start isEmpty. Operand 611 states and 680 transitions. [2022-12-14 15:07:50,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-12-14 15:07:50,185 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:07:50,185 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:07:50,189 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (87)] Ended with exit code 0 [2022-12-14 15:07:50,386 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 87 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable89 [2022-12-14 15:07:50,386 INFO L420 AbstractCegarLoop]: === Iteration 91 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:07:50,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:07:50,387 INFO L85 PathProgramCache]: Analyzing trace with hash 1382225840, now seen corresponding path program 84 times [2022-12-14 15:07:50,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:07:50,387 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2118857632] [2022-12-14 15:07:50,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:07:50,388 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:07:50,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:07:50,847 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:07:50,847 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:07:50,847 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2118857632] [2022-12-14 15:07:50,847 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2118857632] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:07:50,848 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1153706156] [2022-12-14 15:07:50,848 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:07:50,848 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:07:50,848 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:07:50,849 INFO L229 MonitoredProcess]: Starting monitored process 88 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:07:50,849 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Waiting until timeout for monitored process [2022-12-14 15:07:50,888 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:07:50,888 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:07:50,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 58 conjunts are in the unsatisfiable core [2022-12-14 15:07:50,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:07:51,417 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:07:51,417 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:07:51,603 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:07:51,603 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1153706156] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:07:51,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1530240456] [2022-12-14 15:07:51,604 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:07:51,604 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:07:51,604 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:07:51,604 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:07:51,604 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:07:51,956 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:07:54,039 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '128660#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:07:54,040 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:07:54,040 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:07:54,040 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 44 [2022-12-14 15:07:54,040 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126073402] [2022-12-14 15:07:54,040 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:07:54,040 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-12-14 15:07:54,040 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:07:54,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-12-14 15:07:54,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=2700, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 15:07:54,041 INFO L87 Difference]: Start difference. First operand 611 states and 680 transitions. Second operand has 44 states, 44 states have (on average 1.2727272727272727) internal successors, (56), 44 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 15:07:57,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:07:57,002 INFO L93 Difference]: Finished difference Result 734 states and 802 transitions. [2022-12-14 15:07:57,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-12-14 15:07:57,003 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.2727272727272727) internal successors, (56), 44 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 37 [2022-12-14 15:07:57,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:07:57,004 INFO L225 Difference]: With dead ends: 734 [2022-12-14 15:07:57,004 INFO L226 Difference]: Without dead ends: 709 [2022-12-14 15:07:57,004 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 159 GetRequests, 78 SyntacticMatches, 5 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1220 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=333, Invalid=5673, Unknown=0, NotChecked=0, Total=6006 [2022-12-14 15:07:57,004 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 123 mSDsluCounter, 752 mSDsCounter, 0 mSdLazyCounter, 2011 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 123 SdHoareTripleChecker+Valid, 783 SdHoareTripleChecker+Invalid, 2012 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2011 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 15:07:57,004 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [123 Valid, 783 Invalid, 2012 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2011 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 15:07:57,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 709 states. [2022-12-14 15:07:57,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 709 to 601. [2022-12-14 15:07:57,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 601 states, 600 states have (on average 1.115) internal successors, (669), 600 states have internal predecessors, (669), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:07:57,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 601 states to 601 states and 669 transitions. [2022-12-14 15:07:57,938 INFO L78 Accepts]: Start accepts. Automaton has 601 states and 669 transitions. Word has length 37 [2022-12-14 15:07:57,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:07:57,938 INFO L495 AbstractCegarLoop]: Abstraction has 601 states and 669 transitions. [2022-12-14 15:07:57,938 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.2727272727272727) internal successors, (56), 44 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 15:07:57,938 INFO L276 IsEmpty]: Start isEmpty. Operand 601 states and 669 transitions. [2022-12-14 15:07:57,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-12-14 15:07:57,939 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:07:57,939 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:07:57,943 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (88)] Ended with exit code 0 [2022-12-14 15:07:58,139 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable90,88 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:07:58,140 INFO L420 AbstractCegarLoop]: === Iteration 92 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:07:58,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:07:58,141 INFO L85 PathProgramCache]: Analyzing trace with hash 592796458, now seen corresponding path program 85 times [2022-12-14 15:07:58,141 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:07:58,142 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [279629116] [2022-12-14 15:07:58,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:07:58,142 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:07:58,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:07:58,452 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:07:58,452 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:07:58,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [279629116] [2022-12-14 15:07:58,453 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [279629116] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:07:58,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [183977339] [2022-12-14 15:07:58,453 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:07:58,453 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:07:58,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:07:58,454 INFO L229 MonitoredProcess]: Starting monitored process 89 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:07:58,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Waiting until timeout for monitored process [2022-12-14 15:07:58,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:07:58,493 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 54 conjunts are in the unsatisfiable core [2022-12-14 15:07:58,494 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:07:58,923 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:07:58,923 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:07:59,037 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:07:59,037 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [183977339] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:07:59,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1504465740] [2022-12-14 15:07:59,038 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:07:59,038 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:07:59,038 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:07:59,038 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:07:59,038 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:07:59,371 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:08:01,010 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '131610#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:08:01,010 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:08:01,010 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:08:01,011 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 42 [2022-12-14 15:08:01,011 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720018624] [2022-12-14 15:08:01,011 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:08:01,011 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2022-12-14 15:08:01,011 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:08:01,011 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2022-12-14 15:08:01,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=161, Invalid=2491, Unknown=0, NotChecked=0, Total=2652 [2022-12-14 15:08:01,012 INFO L87 Difference]: Start difference. First operand 601 states and 669 transitions. Second operand has 42 states, 42 states have (on average 1.2857142857142858) internal successors, (54), 42 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:08:03,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:08:03,041 INFO L93 Difference]: Finished difference Result 657 states and 724 transitions. [2022-12-14 15:08:03,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-12-14 15:08:03,042 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 1.2857142857142858) internal successors, (54), 42 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2022-12-14 15:08:03,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:08:03,043 INFO L225 Difference]: With dead ends: 657 [2022-12-14 15:08:03,043 INFO L226 Difference]: Without dead ends: 631 [2022-12-14 15:08:03,043 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 78 SyntacticMatches, 5 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1123 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=328, Invalid=5074, Unknown=0, NotChecked=0, Total=5402 [2022-12-14 15:08:03,043 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 89 mSDsluCounter, 428 mSDsCounter, 0 mSdLazyCounter, 1279 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 447 SdHoareTripleChecker+Invalid, 1280 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 15:08:03,043 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 447 Invalid, 1280 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1279 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 15:08:03,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 631 states. [2022-12-14 15:08:03,962 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 631 to 589. [2022-12-14 15:08:03,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 589 states, 588 states have (on average 1.1156462585034013) internal successors, (656), 588 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 15:08:03,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 589 states to 589 states and 656 transitions. [2022-12-14 15:08:03,963 INFO L78 Accepts]: Start accepts. Automaton has 589 states and 656 transitions. Word has length 37 [2022-12-14 15:08:03,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:08:03,963 INFO L495 AbstractCegarLoop]: Abstraction has 589 states and 656 transitions. [2022-12-14 15:08:03,963 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 1.2857142857142858) internal successors, (54), 42 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:08:03,963 INFO L276 IsEmpty]: Start isEmpty. Operand 589 states and 656 transitions. [2022-12-14 15:08:03,964 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2022-12-14 15:08:03,965 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:08:03,965 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:08:03,969 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (89)] Forceful destruction successful, exit code 0 [2022-12-14 15:08:04,165 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable91,89 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:08:04,166 INFO L420 AbstractCegarLoop]: === Iteration 93 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:08:04,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:08:04,167 INFO L85 PathProgramCache]: Analyzing trace with hash -380507792, now seen corresponding path program 86 times [2022-12-14 15:08:04,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:08:04,167 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [284165267] [2022-12-14 15:08:04,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:08:04,168 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:08:04,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:08:04,451 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 15:08:04,451 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:08:04,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [284165267] [2022-12-14 15:08:04,451 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [284165267] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:08:04,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [415065291] [2022-12-14 15:08:04,451 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:08:04,451 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:08:04,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:08:04,452 INFO L229 MonitoredProcess]: Starting monitored process 90 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:08:04,453 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Waiting until timeout for monitored process [2022-12-14 15:08:04,510 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 15:08:04,511 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:08:04,512 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 50 conjunts are in the unsatisfiable core [2022-12-14 15:08:04,513 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:08:04,864 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 15:08:04,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:08:04,987 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 44 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 15:08:04,987 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [415065291] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:08:04,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1514341293] [2022-12-14 15:08:04,988 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:08:04,988 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:08:04,988 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:08:04,988 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:08:04,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:08:05,344 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:08:07,688 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '134384#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:08:07,688 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:08:07,689 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:08:07,689 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 40 [2022-12-14 15:08:07,689 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480233537] [2022-12-14 15:08:07,689 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:08:07,689 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-12-14 15:08:07,689 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:08:07,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-12-14 15:08:07,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=2290, Unknown=0, NotChecked=0, Total=2450 [2022-12-14 15:08:07,690 INFO L87 Difference]: Start difference. First operand 589 states and 656 transitions. Second operand has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:08:09,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:08:09,802 INFO L93 Difference]: Finished difference Result 628 states and 697 transitions. [2022-12-14 15:08:09,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-12-14 15:08:09,803 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2022-12-14 15:08:09,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:08:09,803 INFO L225 Difference]: With dead ends: 628 [2022-12-14 15:08:09,803 INFO L226 Difference]: Without dead ends: 624 [2022-12-14 15:08:09,804 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 78 SyntacticMatches, 5 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1031 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=323, Invalid=4507, Unknown=0, NotChecked=0, Total=4830 [2022-12-14 15:08:09,804 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 72 mSDsluCounter, 258 mSDsCounter, 0 mSdLazyCounter, 722 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 269 SdHoareTripleChecker+Invalid, 723 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 722 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:08:09,804 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [72 Valid, 269 Invalid, 723 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 722 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-12-14 15:08:09,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 624 states. [2022-12-14 15:08:10,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 624 to 600. [2022-12-14 15:08:10,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 600 states, 599 states have (on average 1.1168614357262103) internal successors, (669), 599 states have internal predecessors, (669), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:08:10,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 600 states to 600 states and 669 transitions. [2022-12-14 15:08:10,770 INFO L78 Accepts]: Start accepts. Automaton has 600 states and 669 transitions. Word has length 37 [2022-12-14 15:08:10,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:08:10,770 INFO L495 AbstractCegarLoop]: Abstraction has 600 states and 669 transitions. [2022-12-14 15:08:10,770 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:08:10,770 INFO L276 IsEmpty]: Start isEmpty. Operand 600 states and 669 transitions. [2022-12-14 15:08:10,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-12-14 15:08:10,770 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:08:10,770 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:08:10,775 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (90)] Ended with exit code 0 [2022-12-14 15:08:10,971 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable92,90 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:08:10,972 INFO L420 AbstractCegarLoop]: === Iteration 94 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:08:10,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:08:10,973 INFO L85 PathProgramCache]: Analyzing trace with hash -801720508, now seen corresponding path program 87 times [2022-12-14 15:08:10,973 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:08:10,973 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120488507] [2022-12-14 15:08:10,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:08:10,974 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:08:10,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:08:11,313 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 12 proven. 132 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:08:11,313 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:08:11,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120488507] [2022-12-14 15:08:11,313 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [120488507] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:08:11,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1851339816] [2022-12-14 15:08:11,313 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:08:11,313 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:08:11,313 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:08:11,314 INFO L229 MonitoredProcess]: Starting monitored process 91 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:08:11,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Waiting until timeout for monitored process [2022-12-14 15:08:11,359 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:08:11,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:08:11,360 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 15:08:11,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:08:12,016 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 12 proven. 132 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:08:12,016 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:08:12,797 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 12 proven. 132 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:08:12,797 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1851339816] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:08:12,798 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1675448827] [2022-12-14 15:08:12,798 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:08:12,798 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:08:12,798 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:08:12,798 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:08:12,798 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:08:13,127 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:08:15,494 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '137152#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:08:15,494 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:08:15,494 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:08:15,494 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 64 [2022-12-14 15:08:15,494 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43597848] [2022-12-14 15:08:15,494 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:08:15,494 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-12-14 15:08:15,494 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:08:15,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-12-14 15:08:15,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=5181, Unknown=0, NotChecked=0, Total=5402 [2022-12-14 15:08:15,495 INFO L87 Difference]: Start difference. First operand 600 states and 669 transitions. Second operand has 64 states, 64 states have (on average 1.359375) internal successors, (87), 64 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 15:08:27,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:08:27,433 INFO L93 Difference]: Finished difference Result 1070 states and 1157 transitions. [2022-12-14 15:08:27,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2022-12-14 15:08:27,434 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.359375) internal successors, (87), 64 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) Word has length 38 [2022-12-14 15:08:27,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:08:27,435 INFO L225 Difference]: With dead ends: 1070 [2022-12-14 15:08:27,435 INFO L226 Difference]: Without dead ends: 1031 [2022-12-14 15:08:27,436 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 55 SyntacticMatches, 12 SemanticMatches, 181 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6933 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=6009, Invalid=27297, Unknown=0, NotChecked=0, Total=33306 [2022-12-14 15:08:27,436 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 2419 mSDsluCounter, 980 mSDsCounter, 0 mSdLazyCounter, 2235 mSolverCounterSat, 84 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2419 SdHoareTripleChecker+Valid, 1029 SdHoareTripleChecker+Invalid, 2319 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 84 IncrementalHoareTripleChecker+Valid, 2235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-12-14 15:08:27,436 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2419 Valid, 1029 Invalid, 2319 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [84 Valid, 2235 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-12-14 15:08:27,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1031 states. [2022-12-14 15:08:28,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1031 to 655. [2022-12-14 15:08:28,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 655 states, 654 states have (on average 1.1162079510703364) internal successors, (730), 654 states have internal predecessors, (730), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:08:28,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 655 states to 655 states and 730 transitions. [2022-12-14 15:08:28,496 INFO L78 Accepts]: Start accepts. Automaton has 655 states and 730 transitions. Word has length 38 [2022-12-14 15:08:28,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:08:28,496 INFO L495 AbstractCegarLoop]: Abstraction has 655 states and 730 transitions. [2022-12-14 15:08:28,496 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.359375) internal successors, (87), 64 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 15:08:28,496 INFO L276 IsEmpty]: Start isEmpty. Operand 655 states and 730 transitions. [2022-12-14 15:08:28,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-12-14 15:08:28,496 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:08:28,496 INFO L195 NwaCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:08:28,500 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (91)] Ended with exit code 0 [2022-12-14 15:08:28,697 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable93,91 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:08:28,698 INFO L420 AbstractCegarLoop]: === Iteration 95 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:08:28,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:08:28,698 INFO L85 PathProgramCache]: Analyzing trace with hash 18891607, now seen corresponding path program 88 times [2022-12-14 15:08:28,699 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:08:28,699 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099842879] [2022-12-14 15:08:28,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:08:28,699 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:08:28,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:08:29,111 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:08:29,111 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:08:29,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099842879] [2022-12-14 15:08:29,111 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2099842879] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:08:29,111 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1951262899] [2022-12-14 15:08:29,111 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:08:29,111 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:08:29,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:08:29,112 INFO L229 MonitoredProcess]: Starting monitored process 92 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:08:29,113 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Waiting until timeout for monitored process [2022-12-14 15:08:29,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:08:29,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 34 conjunts are in the unsatisfiable core [2022-12-14 15:08:29,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:08:29,870 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:08:29,870 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:08:30,484 INFO L134 CoverageAnalysis]: Checked inductivity of 148 backedges. 12 proven. 132 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:08:30,484 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1951262899] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:08:30,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2055955445] [2022-12-14 15:08:30,485 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:08:30,485 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:08:30,485 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:08:30,485 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:08:30,485 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:08:30,817 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:08:33,116 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '141056#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:08:33,116 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:08:33,116 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:08:33,117 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 64 [2022-12-14 15:08:33,117 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1227390577] [2022-12-14 15:08:33,117 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:08:33,117 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-12-14 15:08:33,117 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:08:33,117 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-12-14 15:08:33,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=5181, Unknown=0, NotChecked=0, Total=5402 [2022-12-14 15:08:33,118 INFO L87 Difference]: Start difference. First operand 655 states and 730 transitions. Second operand has 64 states, 64 states have (on average 1.359375) internal successors, (87), 64 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 15:08:40,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:08:40,064 INFO L93 Difference]: Finished difference Result 1054 states and 1135 transitions. [2022-12-14 15:08:40,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-12-14 15:08:40,065 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 64 states have (on average 1.359375) internal successors, (87), 64 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) Word has length 38 [2022-12-14 15:08:40,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:08:40,066 INFO L225 Difference]: With dead ends: 1054 [2022-12-14 15:08:40,066 INFO L226 Difference]: Without dead ends: 1037 [2022-12-14 15:08:40,067 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 55 SyntacticMatches, 12 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1701 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=792, Invalid=10550, Unknown=0, NotChecked=0, Total=11342 [2022-12-14 15:08:40,067 INFO L413 NwaCegarLoop]: 84 mSDtfsCounter, 1953 mSDsluCounter, 3029 mSDsCounter, 0 mSdLazyCounter, 3993 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1953 SdHoareTripleChecker+Valid, 3113 SdHoareTripleChecker+Invalid, 4078 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 3993 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:08:40,067 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1953 Valid, 3113 Invalid, 4078 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 3993 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-12-14 15:08:40,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1037 states. [2022-12-14 15:08:41,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1037 to 661. [2022-12-14 15:08:41,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 661 states, 660 states have (on average 1.1151515151515152) internal successors, (736), 660 states have internal predecessors, (736), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:08:41,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 661 states to 661 states and 736 transitions. [2022-12-14 15:08:41,173 INFO L78 Accepts]: Start accepts. Automaton has 661 states and 736 transitions. Word has length 38 [2022-12-14 15:08:41,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:08:41,173 INFO L495 AbstractCegarLoop]: Abstraction has 661 states and 736 transitions. [2022-12-14 15:08:41,173 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 64 states have (on average 1.359375) internal successors, (87), 64 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 15:08:41,174 INFO L276 IsEmpty]: Start isEmpty. Operand 661 states and 736 transitions. [2022-12-14 15:08:41,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-12-14 15:08:41,174 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:08:41,174 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:08:41,178 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (92)] Ended with exit code 0 [2022-12-14 15:08:41,375 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 92 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable94 [2022-12-14 15:08:41,376 INFO L420 AbstractCegarLoop]: === Iteration 96 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:08:41,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:08:41,377 INFO L85 PathProgramCache]: Analyzing trace with hash -1509059820, now seen corresponding path program 89 times [2022-12-14 15:08:41,377 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:08:41,377 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236006116] [2022-12-14 15:08:41,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:08:41,378 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:08:41,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:08:41,498 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-12-14 15:08:41,498 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:08:41,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236006116] [2022-12-14 15:08:41,499 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [236006116] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:08:41,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [796920970] [2022-12-14 15:08:41,499 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:08:41,499 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:08:41,499 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:08:41,500 INFO L229 MonitoredProcess]: Starting monitored process 93 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:08:41,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Waiting until timeout for monitored process [2022-12-14 15:08:41,542 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 15:08:41,542 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:08:41,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 15 conjunts are in the unsatisfiable core [2022-12-14 15:08:41,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:08:41,636 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-12-14 15:08:41,637 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:08:41,691 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-12-14 15:08:41,691 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [796920970] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:08:41,691 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [840502125] [2022-12-14 15:08:41,692 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:08:41,692 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:08:41,692 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:08:41,692 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:08:41,692 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:08:42,035 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:08:43,531 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '144749#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:08:43,531 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:08:43,531 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:08:43,531 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2022-12-14 15:08:43,531 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709538672] [2022-12-14 15:08:43,531 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:08:43,531 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 15:08:43,531 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:08:43,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 15:08:43,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=992, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 15:08:43,532 INFO L87 Difference]: Start difference. First operand 661 states and 736 transitions. Second operand has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:08:45,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:08:45,652 INFO L93 Difference]: Finished difference Result 1048 states and 1181 transitions. [2022-12-14 15:08:45,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-12-14 15:08:45,653 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2022-12-14 15:08:45,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:08:45,654 INFO L225 Difference]: With dead ends: 1048 [2022-12-14 15:08:45,654 INFO L226 Difference]: Without dead ends: 916 [2022-12-14 15:08:45,654 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 82 SyntacticMatches, 13 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 947 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=538, Invalid=2432, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 15:08:45,655 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 316 mSDsluCounter, 192 mSDsCounter, 0 mSdLazyCounter, 360 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 316 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 367 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 360 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:08:45,655 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [316 Valid, 230 Invalid, 367 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 360 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:08:45,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 916 states. [2022-12-14 15:08:46,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 916 to 759. [2022-12-14 15:08:46,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 759 states, 758 states have (on average 1.1174142480211082) internal successors, (847), 758 states have internal predecessors, (847), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:08:46,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 759 states to 759 states and 847 transitions. [2022-12-14 15:08:46,938 INFO L78 Accepts]: Start accepts. Automaton has 759 states and 847 transitions. Word has length 38 [2022-12-14 15:08:46,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:08:46,938 INFO L495 AbstractCegarLoop]: Abstraction has 759 states and 847 transitions. [2022-12-14 15:08:46,938 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:08:46,938 INFO L276 IsEmpty]: Start isEmpty. Operand 759 states and 847 transitions. [2022-12-14 15:08:46,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2022-12-14 15:08:46,939 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:08:46,939 INFO L195 NwaCegarLoop]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:08:46,943 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (93)] Ended with exit code 0 [2022-12-14 15:08:47,139 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable95,93 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:08:47,140 INFO L420 AbstractCegarLoop]: === Iteration 97 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:08:47,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:08:47,141 INFO L85 PathProgramCache]: Analyzing trace with hash 1059366483, now seen corresponding path program 90 times [2022-12-14 15:08:47,141 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:08:47,141 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [156715698] [2022-12-14 15:08:47,142 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:08:47,142 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:08:47,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:08:47,242 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-12-14 15:08:47,242 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:08:47,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [156715698] [2022-12-14 15:08:47,242 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [156715698] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:08:47,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [181796005] [2022-12-14 15:08:47,243 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:08:47,243 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:08:47,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:08:47,243 INFO L229 MonitoredProcess]: Starting monitored process 94 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:08:47,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Waiting until timeout for monitored process [2022-12-14 15:08:47,291 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:08:47,292 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:08:47,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 249 conjuncts, 15 conjunts are in the unsatisfiable core [2022-12-14 15:08:47,293 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:08:47,401 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-12-14 15:08:47,401 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:08:47,480 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2022-12-14 15:08:47,480 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [181796005] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:08:47,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1626415003] [2022-12-14 15:08:47,481 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:08:47,481 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:08:47,481 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:08:47,481 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:08:47,482 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:08:47,831 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:08:49,766 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '148620#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:08:49,767 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:08:49,767 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:08:49,767 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2022-12-14 15:08:49,767 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975740132] [2022-12-14 15:08:49,767 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:08:49,767 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2022-12-14 15:08:49,767 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:08:49,767 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2022-12-14 15:08:49,767 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=971, Unknown=0, NotChecked=0, Total=1190 [2022-12-14 15:08:49,768 INFO L87 Difference]: Start difference. First operand 759 states and 847 transitions. Second operand has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:08:52,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:08:52,258 INFO L93 Difference]: Finished difference Result 856 states and 953 transitions. [2022-12-14 15:08:52,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2022-12-14 15:08:52,259 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 38 [2022-12-14 15:08:52,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:08:52,260 INFO L225 Difference]: With dead ends: 856 [2022-12-14 15:08:52,260 INFO L226 Difference]: Without dead ends: 842 [2022-12-14 15:08:52,260 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 82 SyntacticMatches, 13 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 957 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=559, Invalid=2411, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 15:08:52,260 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 161 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 345 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 353 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 345 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:08:52,260 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 199 Invalid, 353 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 345 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:08:52,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 842 states. [2022-12-14 15:08:53,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 842 to 798. [2022-12-14 15:08:53,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 798 states, 797 states have (on average 1.1279799247176914) internal successors, (899), 797 states have internal predecessors, (899), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:08:53,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 798 states to 798 states and 899 transitions. [2022-12-14 15:08:53,589 INFO L78 Accepts]: Start accepts. Automaton has 798 states and 899 transitions. Word has length 38 [2022-12-14 15:08:53,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:08:53,589 INFO L495 AbstractCegarLoop]: Abstraction has 798 states and 899 transitions. [2022-12-14 15:08:53,589 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:08:53,589 INFO L276 IsEmpty]: Start isEmpty. Operand 798 states and 899 transitions. [2022-12-14 15:08:53,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 15:08:53,590 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:08:53,590 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:08:53,594 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (94)] Ended with exit code 0 [2022-12-14 15:08:53,791 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 94 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable96 [2022-12-14 15:08:53,791 INFO L420 AbstractCegarLoop]: === Iteration 98 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:08:53,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:08:53,792 INFO L85 PathProgramCache]: Analyzing trace with hash 1048487991, now seen corresponding path program 91 times [2022-12-14 15:08:53,793 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:08:53,793 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801636604] [2022-12-14 15:08:53,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:08:53,794 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:08:53,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:08:54,515 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 0 proven. 158 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:08:54,515 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:08:54,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801636604] [2022-12-14 15:08:54,515 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1801636604] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:08:54,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2036580143] [2022-12-14 15:08:54,516 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:08:54,516 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:08:54,516 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:08:54,516 INFO L229 MonitoredProcess]: Starting monitored process 95 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:08:54,517 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Waiting until timeout for monitored process [2022-12-14 15:08:54,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:08:54,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 74 conjunts are in the unsatisfiable core [2022-12-14 15:08:54,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:08:54,705 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 0 proven. 158 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:08:54,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:08:55,177 INFO L134 CoverageAnalysis]: Checked inductivity of 160 backedges. 0 proven. 158 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:08:55,178 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2036580143] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:08:55,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [798423644] [2022-12-14 15:08:55,178 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:08:55,178 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:08:55,178 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:08:55,178 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:08:55,179 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:08:55,503 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:08:57,825 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '152218#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:08:57,825 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:08:57,825 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:08:57,825 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 52 [2022-12-14 15:08:57,825 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580604300] [2022-12-14 15:08:57,825 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:08:57,826 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-12-14 15:08:57,826 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:08:57,826 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-12-14 15:08:57,826 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=3615, Unknown=0, NotChecked=0, Total=3782 [2022-12-14 15:08:57,826 INFO L87 Difference]: Start difference. First operand 798 states and 899 transitions. Second operand has 52 states, 52 states have (on average 1.1923076923076923) internal successors, (62), 52 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:09:05,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:09:05,537 INFO L93 Difference]: Finished difference Result 1459 states and 1576 transitions. [2022-12-14 15:09:05,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-12-14 15:09:05,538 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.1923076923076923) internal successors, (62), 52 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2022-12-14 15:09:05,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:09:05,539 INFO L225 Difference]: With dead ends: 1459 [2022-12-14 15:09:05,540 INFO L226 Difference]: Without dead ends: 1453 [2022-12-14 15:09:05,540 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 83 SyntacticMatches, 6 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1265 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=381, Invalid=8549, Unknown=0, NotChecked=0, Total=8930 [2022-12-14 15:09:05,540 INFO L413 NwaCegarLoop]: 71 mSDtfsCounter, 238 mSDsluCounter, 2009 mSDsCounter, 0 mSdLazyCounter, 4815 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 238 SdHoareTripleChecker+Valid, 2080 SdHoareTripleChecker+Invalid, 4816 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 4815 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:09:05,540 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [238 Valid, 2080 Invalid, 4816 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 4815 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-12-14 15:09:05,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1453 states. [2022-12-14 15:09:06,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1453 to 804. [2022-12-14 15:09:06,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 804 states, 803 states have (on average 1.12826899128269) internal successors, (906), 803 states have internal predecessors, (906), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:09:06,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 804 states to 804 states and 906 transitions. [2022-12-14 15:09:06,890 INFO L78 Accepts]: Start accepts. Automaton has 804 states and 906 transitions. Word has length 39 [2022-12-14 15:09:06,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:09:06,890 INFO L495 AbstractCegarLoop]: Abstraction has 804 states and 906 transitions. [2022-12-14 15:09:06,890 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.1923076923076923) internal successors, (62), 52 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:09:06,890 INFO L276 IsEmpty]: Start isEmpty. Operand 804 states and 906 transitions. [2022-12-14 15:09:06,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 15:09:06,891 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:09:06,891 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:09:06,895 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (95)] Ended with exit code 0 [2022-12-14 15:09:07,091 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable97,95 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:09:07,092 INFO L420 AbstractCegarLoop]: === Iteration 99 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:09:07,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:09:07,093 INFO L85 PathProgramCache]: Analyzing trace with hash 617397469, now seen corresponding path program 92 times [2022-12-14 15:09:07,093 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:09:07,093 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1899747104] [2022-12-14 15:09:07,093 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:09:07,094 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:09:07,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:09:07,528 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 116 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:09:07,528 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:09:07,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1899747104] [2022-12-14 15:09:07,528 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1899747104] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:09:07,528 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1503454195] [2022-12-14 15:09:07,528 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:09:07,528 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:09:07,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:09:07,529 INFO L229 MonitoredProcess]: Starting monitored process 96 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:09:07,530 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Waiting until timeout for monitored process [2022-12-14 15:09:07,573 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 15:09:07,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:09:07,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 70 conjunts are in the unsatisfiable core [2022-12-14 15:09:07,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:09:08,009 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 116 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:09:08,009 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:09:08,221 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 116 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:09:08,221 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1503454195] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:09:08,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1082370030] [2022-12-14 15:09:08,222 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:09:08,222 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:09:08,222 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:09:08,222 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:09:08,222 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:09:08,566 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:09:11,116 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '157031#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:09:11,116 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:09:11,117 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:09:11,117 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 51 [2022-12-14 15:09:11,117 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1761424261] [2022-12-14 15:09:11,117 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:09:11,117 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-12-14 15:09:11,117 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:09:11,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-12-14 15:09:11,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=3489, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 15:09:11,118 INFO L87 Difference]: Start difference. First operand 804 states and 906 transitions. Second operand has 51 states, 51 states have (on average 1.2352941176470589) internal successors, (63), 51 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 15:09:17,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:09:17,929 INFO L93 Difference]: Finished difference Result 1263 states and 1364 transitions. [2022-12-14 15:09:17,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-12-14 15:09:17,930 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 1.2352941176470589) internal successors, (63), 51 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) Word has length 39 [2022-12-14 15:09:17,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:09:17,932 INFO L225 Difference]: With dead ends: 1263 [2022-12-14 15:09:17,932 INFO L226 Difference]: Without dead ends: 1239 [2022-12-14 15:09:17,932 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 83 SyntacticMatches, 5 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1591 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=360, Invalid=7830, Unknown=0, NotChecked=0, Total=8190 [2022-12-14 15:09:17,932 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 198 mSDsluCounter, 1659 mSDsCounter, 0 mSdLazyCounter, 4090 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 198 SdHoareTripleChecker+Valid, 1719 SdHoareTripleChecker+Invalid, 4091 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 4090 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-12-14 15:09:17,933 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [198 Valid, 1719 Invalid, 4091 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 4090 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-12-14 15:09:17,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1239 states. [2022-12-14 15:09:19,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1239 to 798. [2022-12-14 15:09:19,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 798 states, 797 states have (on average 1.1279799247176914) internal successors, (899), 797 states have internal predecessors, (899), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:09:19,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 798 states to 798 states and 899 transitions. [2022-12-14 15:09:19,275 INFO L78 Accepts]: Start accepts. Automaton has 798 states and 899 transitions. Word has length 39 [2022-12-14 15:09:19,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:09:19,275 INFO L495 AbstractCegarLoop]: Abstraction has 798 states and 899 transitions. [2022-12-14 15:09:19,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 1.2352941176470589) internal successors, (63), 51 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 15:09:19,276 INFO L276 IsEmpty]: Start isEmpty. Operand 798 states and 899 transitions. [2022-12-14 15:09:19,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 15:09:19,276 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:09:19,276 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:09:19,281 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (96)] Ended with exit code 0 [2022-12-14 15:09:19,477 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable98,96 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:09:19,478 INFO L420 AbstractCegarLoop]: === Iteration 100 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:09:19,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:09:19,478 INFO L85 PathProgramCache]: Analyzing trace with hash 1226436343, now seen corresponding path program 93 times [2022-12-14 15:09:19,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:09:19,479 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1345849460] [2022-12-14 15:09:19,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:09:19,479 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:09:19,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:09:19,893 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:09:19,893 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:09:19,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1345849460] [2022-12-14 15:09:19,893 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1345849460] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:09:19,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1469112971] [2022-12-14 15:09:19,894 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:09:19,894 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:09:19,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:09:19,894 INFO L229 MonitoredProcess]: Starting monitored process 97 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:09:19,895 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Waiting until timeout for monitored process [2022-12-14 15:09:19,937 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:09:19,937 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:09:19,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 66 conjunts are in the unsatisfiable core [2022-12-14 15:09:19,940 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:09:20,377 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:09:20,377 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:09:20,537 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:09:20,538 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1469112971] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:09:20,538 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [257060680] [2022-12-14 15:09:20,538 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:09:20,539 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:09:20,539 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:09:20,539 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:09:20,539 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:09:20,873 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:09:22,977 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '161444#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:09:22,977 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:09:22,977 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:09:22,977 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 49 [2022-12-14 15:09:22,977 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [296140186] [2022-12-14 15:09:22,977 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:09:22,977 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-12-14 15:09:22,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:09:22,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-12-14 15:09:22,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=170, Invalid=3252, Unknown=0, NotChecked=0, Total=3422 [2022-12-14 15:09:22,978 INFO L87 Difference]: Start difference. First operand 798 states and 899 transitions. Second operand has 49 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 49 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 15:09:28,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:09:28,800 INFO L93 Difference]: Finished difference Result 1106 states and 1206 transitions. [2022-12-14 15:09:28,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-12-14 15:09:28,801 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 49 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2022-12-14 15:09:28,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:09:28,802 INFO L225 Difference]: With dead ends: 1106 [2022-12-14 15:09:28,802 INFO L226 Difference]: Without dead ends: 1081 [2022-12-14 15:09:28,802 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 83 SyntacticMatches, 5 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1480 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=355, Invalid=7127, Unknown=0, NotChecked=0, Total=7482 [2022-12-14 15:09:28,802 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 168 mSDsluCounter, 1317 mSDsCounter, 0 mSdLazyCounter, 3371 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 1365 SdHoareTripleChecker+Invalid, 3372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:09:28,803 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [168 Valid, 1365 Invalid, 3372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3371 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-12-14 15:09:28,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1081 states. [2022-12-14 15:09:30,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1081 to 790. [2022-12-14 15:09:30,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 790 states, 789 states have (on average 1.1280101394169835) internal successors, (890), 789 states have internal predecessors, (890), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:09:30,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 790 states to 790 states and 890 transitions. [2022-12-14 15:09:30,136 INFO L78 Accepts]: Start accepts. Automaton has 790 states and 890 transitions. Word has length 39 [2022-12-14 15:09:30,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:09:30,136 INFO L495 AbstractCegarLoop]: Abstraction has 790 states and 890 transitions. [2022-12-14 15:09:30,136 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.2448979591836735) internal successors, (61), 49 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 15:09:30,136 INFO L276 IsEmpty]: Start isEmpty. Operand 790 states and 890 transitions. [2022-12-14 15:09:30,137 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 15:09:30,137 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:09:30,137 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:09:30,141 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (97)] Ended with exit code 0 [2022-12-14 15:09:30,337 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 97 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable99 [2022-12-14 15:09:30,338 INFO L420 AbstractCegarLoop]: === Iteration 101 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:09:30,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:09:30,339 INFO L85 PathProgramCache]: Analyzing trace with hash 1992035869, now seen corresponding path program 94 times [2022-12-14 15:09:30,339 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:09:30,339 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [881729340] [2022-12-14 15:09:30,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:09:30,340 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:09:30,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:09:30,768 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 62 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:09:30,768 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:09:30,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [881729340] [2022-12-14 15:09:30,768 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [881729340] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:09:30,768 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209231516] [2022-12-14 15:09:30,768 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:09:30,768 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:09:30,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:09:30,769 INFO L229 MonitoredProcess]: Starting monitored process 98 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:09:30,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Waiting until timeout for monitored process [2022-12-14 15:09:30,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:09:30,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 62 conjunts are in the unsatisfiable core [2022-12-14 15:09:30,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:09:31,244 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 62 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:09:31,244 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:09:31,393 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 62 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:09:31,394 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [209231516] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:09:31,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [210000966] [2022-12-14 15:09:31,394 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:09:31,394 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:09:31,394 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:09:31,395 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:09:31,395 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:09:31,735 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:09:33,688 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '165529#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:09:33,688 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:09:33,688 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:09:33,689 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 47 [2022-12-14 15:09:33,689 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2015209352] [2022-12-14 15:09:33,689 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:09:33,689 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-12-14 15:09:33,689 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:09:33,689 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-12-14 15:09:33,689 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=3023, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 15:09:33,689 INFO L87 Difference]: Start difference. First operand 790 states and 890 transitions. Second operand has 47 states, 47 states have (on average 1.2553191489361701) internal successors, (59), 47 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 15:09:38,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:09:38,039 INFO L93 Difference]: Finished difference Result 986 states and 1085 transitions. [2022-12-14 15:09:38,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2022-12-14 15:09:38,040 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.2553191489361701) internal successors, (59), 47 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2022-12-14 15:09:38,040 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:09:38,041 INFO L225 Difference]: With dead ends: 986 [2022-12-14 15:09:38,041 INFO L226 Difference]: Without dead ends: 960 [2022-12-14 15:09:38,042 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 83 SyntacticMatches, 5 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1373 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=350, Invalid=6456, Unknown=0, NotChecked=0, Total=6806 [2022-12-14 15:09:38,042 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 139 mSDsluCounter, 813 mSDsCounter, 0 mSdLazyCounter, 2140 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 849 SdHoareTripleChecker+Invalid, 2141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2140 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 15:09:38,042 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [139 Valid, 849 Invalid, 2141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2140 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 15:09:38,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 960 states. [2022-12-14 15:09:39,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 960 to 780. [2022-12-14 15:09:39,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 780 states, 779 states have (on average 1.128369704749679) internal successors, (879), 779 states have internal predecessors, (879), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:09:39,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 780 states to 780 states and 879 transitions. [2022-12-14 15:09:39,364 INFO L78 Accepts]: Start accepts. Automaton has 780 states and 879 transitions. Word has length 39 [2022-12-14 15:09:39,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:09:39,364 INFO L495 AbstractCegarLoop]: Abstraction has 780 states and 879 transitions. [2022-12-14 15:09:39,364 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.2553191489361701) internal successors, (59), 47 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 15:09:39,364 INFO L276 IsEmpty]: Start isEmpty. Operand 780 states and 879 transitions. [2022-12-14 15:09:39,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 15:09:39,365 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:09:39,365 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:09:39,369 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (98)] Ended with exit code 0 [2022-12-14 15:09:39,565 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 98 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable100 [2022-12-14 15:09:39,566 INFO L420 AbstractCegarLoop]: === Iteration 102 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:09:39,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:09:39,567 INFO L85 PathProgramCache]: Analyzing trace with hash -1598356041, now seen corresponding path program 95 times [2022-12-14 15:09:39,567 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:09:39,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [700456873] [2022-12-14 15:09:39,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:09:39,567 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:09:39,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:09:39,965 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:09:39,965 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:09:39,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [700456873] [2022-12-14 15:09:39,966 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [700456873] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:09:39,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1557003840] [2022-12-14 15:09:39,966 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:09:39,966 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:09:39,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:09:39,967 INFO L229 MonitoredProcess]: Starting monitored process 99 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:09:39,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Waiting until timeout for monitored process [2022-12-14 15:09:40,011 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 15:09:40,011 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:09:40,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 58 conjunts are in the unsatisfiable core [2022-12-14 15:09:40,013 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:09:40,590 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:09:40,590 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:09:40,790 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:09:40,790 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1557003840] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:09:40,790 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1511507321] [2022-12-14 15:09:40,791 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:09:40,791 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:09:40,791 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:09:40,791 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:09:40,791 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:09:41,144 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:09:43,406 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '169356#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:09:43,406 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:09:43,407 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:09:43,407 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 45 [2022-12-14 15:09:43,407 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337138194] [2022-12-14 15:09:43,407 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:09:43,407 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2022-12-14 15:09:43,407 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:09:43,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2022-12-14 15:09:43,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=2802, Unknown=0, NotChecked=0, Total=2970 [2022-12-14 15:09:43,408 INFO L87 Difference]: Start difference. First operand 780 states and 879 transitions. Second operand has 45 states, 45 states have (on average 1.2666666666666666) internal successors, (57), 45 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 15:09:46,920 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:09:46,920 INFO L93 Difference]: Finished difference Result 895 states and 993 transitions. [2022-12-14 15:09:46,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2022-12-14 15:09:46,921 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 1.2666666666666666) internal successors, (57), 45 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 39 [2022-12-14 15:09:46,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:09:46,922 INFO L225 Difference]: With dead ends: 895 [2022-12-14 15:09:46,922 INFO L226 Difference]: Without dead ends: 868 [2022-12-14 15:09:46,922 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 83 SyntacticMatches, 5 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1270 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=345, Invalid=5817, Unknown=0, NotChecked=0, Total=6162 [2022-12-14 15:09:46,923 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 108 mSDsluCounter, 491 mSDsCounter, 0 mSdLazyCounter, 1458 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 515 SdHoareTripleChecker+Invalid, 1459 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-12-14 15:09:46,923 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 515 Invalid, 1459 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1458 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-12-14 15:09:46,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 868 states. [2022-12-14 15:09:48,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 868 to 768. [2022-12-14 15:09:48,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 768 states, 767 states have (on average 1.1290743155149934) internal successors, (866), 767 states have internal predecessors, (866), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:09:48,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 768 states to 768 states and 866 transitions. [2022-12-14 15:09:48,235 INFO L78 Accepts]: Start accepts. Automaton has 768 states and 866 transitions. Word has length 39 [2022-12-14 15:09:48,235 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:09:48,235 INFO L495 AbstractCegarLoop]: Abstraction has 768 states and 866 transitions. [2022-12-14 15:09:48,235 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 1.2666666666666666) internal successors, (57), 45 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 15:09:48,235 INFO L276 IsEmpty]: Start isEmpty. Operand 768 states and 866 transitions. [2022-12-14 15:09:48,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 15:09:48,236 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:09:48,236 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:09:48,240 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (99)] Ended with exit code 0 [2022-12-14 15:09:48,436 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 99 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable101 [2022-12-14 15:09:48,437 INFO L420 AbstractCegarLoop]: === Iteration 103 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:09:48,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:09:48,438 INFO L85 PathProgramCache]: Analyzing trace with hash 764574194, now seen corresponding path program 96 times [2022-12-14 15:09:48,438 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:09:48,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706502289] [2022-12-14 15:09:48,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:09:48,439 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:09:48,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:09:48,708 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 7 proven. 43 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-12-14 15:09:48,708 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:09:48,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [706502289] [2022-12-14 15:09:48,709 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [706502289] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:09:48,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1833804558] [2022-12-14 15:09:48,709 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:09:48,709 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:09:48,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:09:48,710 INFO L229 MonitoredProcess]: Starting monitored process 100 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:09:48,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Waiting until timeout for monitored process [2022-12-14 15:09:48,750 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:09:48,751 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:09:48,752 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 15:09:48,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:09:49,140 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-12-14 15:09:49,140 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:09:49,508 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-12-14 15:09:49,508 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1833804558] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:09:49,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2057383363] [2022-12-14 15:09:49,508 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:09:49,508 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:09:49,508 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:09:49,509 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:09:49,509 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:09:49,850 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:09:52,494 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '172976#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:09:52,494 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:09:52,494 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:09:52,494 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 40 [2022-12-14 15:09:52,494 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [18886717] [2022-12-14 15:09:52,494 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:09:52,494 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-12-14 15:09:52,494 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:09:52,495 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-12-14 15:09:52,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=2291, Unknown=0, NotChecked=0, Total=2450 [2022-12-14 15:09:52,495 INFO L87 Difference]: Start difference. First operand 768 states and 866 transitions. Second operand has 40 states, 40 states have (on average 1.375) internal successors, (55), 40 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:09:56,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:09:56,635 INFO L93 Difference]: Finished difference Result 979 states and 1096 transitions. [2022-12-14 15:09:56,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2022-12-14 15:09:56,636 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.375) internal successors, (55), 40 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2022-12-14 15:09:56,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:09:56,637 INFO L225 Difference]: With dead ends: 979 [2022-12-14 15:09:56,637 INFO L226 Difference]: Without dead ends: 914 [2022-12-14 15:09:56,638 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 78 SyntacticMatches, 7 SemanticMatches, 93 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1646 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=1559, Invalid=7371, Unknown=0, NotChecked=0, Total=8930 [2022-12-14 15:09:56,638 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 1094 mSDsluCounter, 447 mSDsCounter, 0 mSdLazyCounter, 782 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1094 SdHoareTripleChecker+Valid, 477 SdHoareTripleChecker+Invalid, 812 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 782 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 15:09:56,638 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1094 Valid, 477 Invalid, 812 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 782 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 15:09:56,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 914 states. [2022-12-14 15:09:58,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 914 to 838. [2022-12-14 15:09:58,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 838 states, 837 states have (on average 1.1170848267622462) internal successors, (935), 837 states have internal predecessors, (935), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:09:58,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 838 states to 838 states and 935 transitions. [2022-12-14 15:09:58,090 INFO L78 Accepts]: Start accepts. Automaton has 838 states and 935 transitions. Word has length 39 [2022-12-14 15:09:58,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:09:58,090 INFO L495 AbstractCegarLoop]: Abstraction has 838 states and 935 transitions. [2022-12-14 15:09:58,090 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.375) internal successors, (55), 40 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:09:58,090 INFO L276 IsEmpty]: Start isEmpty. Operand 838 states and 935 transitions. [2022-12-14 15:09:58,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 15:09:58,091 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:09:58,091 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:09:58,095 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (100)] Ended with exit code 0 [2022-12-14 15:09:58,291 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 100 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable102 [2022-12-14 15:09:58,292 INFO L420 AbstractCegarLoop]: === Iteration 104 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:09:58,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:09:58,293 INFO L85 PathProgramCache]: Analyzing trace with hash 2043645789, now seen corresponding path program 97 times [2022-12-14 15:09:58,293 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:09:58,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2091283339] [2022-12-14 15:09:58,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:09:58,294 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:09:58,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:09:58,708 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 15:09:58,709 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:09:58,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2091283339] [2022-12-14 15:09:58,709 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2091283339] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:09:58,709 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1310567632] [2022-12-14 15:09:58,709 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:09:58,709 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:09:58,709 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:09:58,710 INFO L229 MonitoredProcess]: Starting monitored process 101 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:09:58,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Waiting until timeout for monitored process [2022-12-14 15:09:58,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:09:58,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 54 conjunts are in the unsatisfiable core [2022-12-14 15:09:58,751 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:09:59,123 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 15:09:59,123 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:09:59,437 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 48 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 15:09:59,437 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1310567632] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:09:59,437 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1608355667] [2022-12-14 15:09:59,438 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:09:59,438 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:09:59,438 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:09:59,438 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:09:59,438 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:09:59,776 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:10:01,675 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '176945#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:10:01,675 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:10:01,675 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:10:01,676 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 47 [2022-12-14 15:10:01,676 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132987036] [2022-12-14 15:10:01,676 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:10:01,676 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 47 states [2022-12-14 15:10:01,676 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:10:01,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2022-12-14 15:10:01,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=3010, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 15:10:01,676 INFO L87 Difference]: Start difference. First operand 838 states and 935 transitions. Second operand has 47 states, 47 states have (on average 1.2553191489361701) internal successors, (59), 47 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 15:10:05,008 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:10:05,008 INFO L93 Difference]: Finished difference Result 922 states and 1022 transitions. [2022-12-14 15:10:05,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-12-14 15:10:05,009 INFO L78 Accepts]: Start accepts. Automaton has has 47 states, 47 states have (on average 1.2553191489361701) internal successors, (59), 47 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2022-12-14 15:10:05,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:10:05,010 INFO L225 Difference]: With dead ends: 922 [2022-12-14 15:10:05,010 INFO L226 Difference]: Without dead ends: 894 [2022-12-14 15:10:05,010 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 75 SyntacticMatches, 9 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1262 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=359, Invalid=5803, Unknown=0, NotChecked=0, Total=6162 [2022-12-14 15:10:05,011 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 84 mSDsluCounter, 415 mSDsCounter, 0 mSdLazyCounter, 1286 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 430 SdHoareTripleChecker+Invalid, 1287 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1286 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 15:10:05,011 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [84 Valid, 430 Invalid, 1287 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1286 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 15:10:05,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 894 states. [2022-12-14 15:10:06,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 894 to 834. [2022-12-14 15:10:06,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 834 states, 833 states have (on average 1.1188475390156063) internal successors, (932), 833 states have internal predecessors, (932), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:10:06,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 834 states to 834 states and 932 transitions. [2022-12-14 15:10:06,500 INFO L78 Accepts]: Start accepts. Automaton has 834 states and 932 transitions. Word has length 39 [2022-12-14 15:10:06,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:10:06,500 INFO L495 AbstractCegarLoop]: Abstraction has 834 states and 932 transitions. [2022-12-14 15:10:06,500 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 47 states, 47 states have (on average 1.2553191489361701) internal successors, (59), 47 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 15:10:06,500 INFO L276 IsEmpty]: Start isEmpty. Operand 834 states and 932 transitions. [2022-12-14 15:10:06,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-12-14 15:10:06,500 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:10:06,500 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:10:06,505 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (101)] Ended with exit code 0 [2022-12-14 15:10:06,701 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 101 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable103 [2022-12-14 15:10:06,702 INFO L420 AbstractCegarLoop]: === Iteration 105 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:10:06,702 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:10:06,702 INFO L85 PathProgramCache]: Analyzing trace with hash 1378957256, now seen corresponding path program 98 times [2022-12-14 15:10:06,703 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:10:06,703 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023268475] [2022-12-14 15:10:06,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:10:06,703 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:10:06,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:10:06,947 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2022-12-14 15:10:06,947 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:10:06,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023268475] [2022-12-14 15:10:06,947 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2023268475] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:10:06,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1812868397] [2022-12-14 15:10:06,947 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:10:06,947 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:10:06,948 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:10:06,948 INFO L229 MonitoredProcess]: Starting monitored process 102 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:10:06,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Waiting until timeout for monitored process [2022-12-14 15:10:06,992 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 15:10:06,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:10:06,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 24 conjunts are in the unsatisfiable core [2022-12-14 15:10:06,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:10:07,257 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-12-14 15:10:07,257 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:10:07,503 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 7 proven. 42 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked. [2022-12-14 15:10:07,503 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1812868397] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:10:07,504 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [512695476] [2022-12-14 15:10:07,504 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:10:07,504 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:10:07,504 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:10:07,504 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:10:07,504 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:10:07,835 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:10:10,406 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '180751#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:10:10,406 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:10:10,406 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:10:10,407 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17, 17] total 40 [2022-12-14 15:10:10,407 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477577739] [2022-12-14 15:10:10,407 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:10:10,407 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2022-12-14 15:10:10,407 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:10:10,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2022-12-14 15:10:10,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=2291, Unknown=0, NotChecked=0, Total=2450 [2022-12-14 15:10:10,408 INFO L87 Difference]: Start difference. First operand 834 states and 932 transitions. Second operand has 40 states, 40 states have (on average 1.4) internal successors, (56), 40 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 15:10:14,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:10:14,052 INFO L93 Difference]: Finished difference Result 914 states and 1006 transitions. [2022-12-14 15:10:14,053 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2022-12-14 15:10:14,053 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.4) internal successors, (56), 40 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 39 [2022-12-14 15:10:14,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:10:14,054 INFO L225 Difference]: With dead ends: 914 [2022-12-14 15:10:14,054 INFO L226 Difference]: Without dead ends: 878 [2022-12-14 15:10:14,054 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 78 SyntacticMatches, 7 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 724 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=413, Invalid=4279, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 15:10:14,055 INFO L413 NwaCegarLoop]: 49 mSDtfsCounter, 825 mSDsluCounter, 1064 mSDsCounter, 0 mSdLazyCounter, 1766 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 825 SdHoareTripleChecker+Valid, 1113 SdHoareTripleChecker+Invalid, 1797 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 1766 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-12-14 15:10:14,055 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [825 Valid, 1113 Invalid, 1797 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 1766 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-12-14 15:10:14,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 878 states. [2022-12-14 15:10:15,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 878 to 834. [2022-12-14 15:10:15,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 834 states, 833 states have (on average 1.1044417767106842) internal successors, (920), 833 states have internal predecessors, (920), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:10:15,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 834 states to 834 states and 920 transitions. [2022-12-14 15:10:15,574 INFO L78 Accepts]: Start accepts. Automaton has 834 states and 920 transitions. Word has length 39 [2022-12-14 15:10:15,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:10:15,574 INFO L495 AbstractCegarLoop]: Abstraction has 834 states and 920 transitions. [2022-12-14 15:10:15,574 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.4) internal successors, (56), 40 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 15:10:15,574 INFO L276 IsEmpty]: Start isEmpty. Operand 834 states and 920 transitions. [2022-12-14 15:10:15,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-12-14 15:10:15,575 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:10:15,575 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:10:15,579 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (102)] Forceful destruction successful, exit code 0 [2022-12-14 15:10:15,775 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 102 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable104 [2022-12-14 15:10:15,775 INFO L420 AbstractCegarLoop]: === Iteration 106 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:10:15,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:10:15,776 INFO L85 PathProgramCache]: Analyzing trace with hash -1393762473, now seen corresponding path program 99 times [2022-12-14 15:10:15,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:10:15,776 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1006036761] [2022-12-14 15:10:15,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:10:15,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:10:15,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:10:16,206 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 13 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:10:16,206 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:10:16,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1006036761] [2022-12-14 15:10:16,206 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1006036761] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:10:16,206 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2012303989] [2022-12-14 15:10:16,206 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:10:16,207 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:10:16,207 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:10:16,207 INFO L229 MonitoredProcess]: Starting monitored process 103 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:10:16,208 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Waiting until timeout for monitored process [2022-12-14 15:10:16,253 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:10:16,254 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:10:16,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 36 conjunts are in the unsatisfiable core [2022-12-14 15:10:16,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:10:17,058 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 13 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:10:17,058 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:10:17,940 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 13 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:10:17,940 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2012303989] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:10:17,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [825309727] [2022-12-14 15:10:17,940 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:10:17,941 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:10:17,941 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:10:17,941 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:10:17,941 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:10:18,303 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:10:21,282 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '184558#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:10:21,282 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:10:21,282 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:10:21,282 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 69 [2022-12-14 15:10:21,282 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983818085] [2022-12-14 15:10:21,282 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:10:21,282 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-12-14 15:10:21,282 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:10:21,282 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-12-14 15:10:21,283 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=5927, Unknown=0, NotChecked=0, Total=6162 [2022-12-14 15:10:21,283 INFO L87 Difference]: Start difference. First operand 834 states and 920 transitions. Second operand has 69 states, 69 states have (on average 1.3333333333333333) internal successors, (92), 69 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:10:37,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:10:37,749 INFO L93 Difference]: Finished difference Result 1460 states and 1567 transitions. [2022-12-14 15:10:37,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 129 states. [2022-12-14 15:10:37,750 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 1.3333333333333333) internal successors, (92), 69 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2022-12-14 15:10:37,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:10:37,752 INFO L225 Difference]: With dead ends: 1460 [2022-12-14 15:10:37,752 INFO L226 Difference]: Without dead ends: 1418 [2022-12-14 15:10:37,753 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 57 SyntacticMatches, 13 SemanticMatches, 202 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8847 ImplicationChecksByTransitivity, 14.3s TimeCoverageRelationStatistics Valid=7511, Invalid=33901, Unknown=0, NotChecked=0, Total=41412 [2022-12-14 15:10:37,754 INFO L413 NwaCegarLoop]: 53 mSDtfsCounter, 2738 mSDsluCounter, 1186 mSDsCounter, 0 mSdLazyCounter, 2938 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2738 SdHoareTripleChecker+Valid, 1239 SdHoareTripleChecker+Invalid, 3032 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 2938 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:10:37,754 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2738 Valid, 1239 Invalid, 3032 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 2938 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-12-14 15:10:37,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1418 states. [2022-12-14 15:10:39,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1418 to 906. [2022-12-14 15:10:39,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 906 states, 905 states have (on average 1.1038674033149172) internal successors, (999), 905 states have internal predecessors, (999), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:10:39,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 906 states to 906 states and 999 transitions. [2022-12-14 15:10:39,403 INFO L78 Accepts]: Start accepts. Automaton has 906 states and 999 transitions. Word has length 40 [2022-12-14 15:10:39,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:10:39,403 INFO L495 AbstractCegarLoop]: Abstraction has 906 states and 999 transitions. [2022-12-14 15:10:39,403 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 1.3333333333333333) internal successors, (92), 69 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:10:39,403 INFO L276 IsEmpty]: Start isEmpty. Operand 906 states and 999 transitions. [2022-12-14 15:10:39,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-12-14 15:10:39,404 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:10:39,404 INFO L195 NwaCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:10:39,409 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (103)] Ended with exit code 0 [2022-12-14 15:10:39,604 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable105,103 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:10:39,605 INFO L420 AbstractCegarLoop]: === Iteration 107 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:10:39,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:10:39,606 INFO L85 PathProgramCache]: Analyzing trace with hash -1724590684, now seen corresponding path program 100 times [2022-12-14 15:10:39,606 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:10:39,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944612696] [2022-12-14 15:10:39,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:10:39,607 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:10:39,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:10:40,058 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:10:40,058 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:10:40,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944612696] [2022-12-14 15:10:40,058 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944612696] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:10:40,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [615317978] [2022-12-14 15:10:40,058 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:10:40,058 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:10:40,059 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:10:40,059 INFO L229 MonitoredProcess]: Starting monitored process 104 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:10:40,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Waiting until timeout for monitored process [2022-12-14 15:10:40,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:10:40,103 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 36 conjunts are in the unsatisfiable core [2022-12-14 15:10:40,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:10:40,954 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:10:40,955 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:10:41,850 INFO L134 CoverageAnalysis]: Checked inductivity of 173 backedges. 13 proven. 156 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:10:41,850 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [615317978] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:10:41,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1118949275] [2022-12-14 15:10:41,851 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:10:41,851 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:10:41,851 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:10:41,851 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:10:41,851 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:10:42,183 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:10:45,040 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '189789#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:10:45,041 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:10:45,041 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:10:45,041 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 69 [2022-12-14 15:10:45,041 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916788823] [2022-12-14 15:10:45,041 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:10:45,041 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2022-12-14 15:10:45,041 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:10:45,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2022-12-14 15:10:45,042 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=5927, Unknown=0, NotChecked=0, Total=6162 [2022-12-14 15:10:45,042 INFO L87 Difference]: Start difference. First operand 906 states and 999 transitions. Second operand has 69 states, 69 states have (on average 1.3333333333333333) internal successors, (92), 69 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:10:55,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:10:55,620 INFO L93 Difference]: Finished difference Result 1443 states and 1543 transitions. [2022-12-14 15:10:55,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-12-14 15:10:55,621 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 1.3333333333333333) internal successors, (92), 69 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2022-12-14 15:10:55,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:10:55,622 INFO L225 Difference]: With dead ends: 1443 [2022-12-14 15:10:55,622 INFO L226 Difference]: Without dead ends: 1425 [2022-12-14 15:10:55,623 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 57 SyntacticMatches, 13 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1965 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=894, Invalid=12216, Unknown=0, NotChecked=0, Total=13110 [2022-12-14 15:10:55,623 INFO L413 NwaCegarLoop]: 91 mSDtfsCounter, 2195 mSDsluCounter, 3505 mSDsCounter, 0 mSdLazyCounter, 4680 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2195 SdHoareTripleChecker+Valid, 3596 SdHoareTripleChecker+Invalid, 4779 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 4680 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-12-14 15:10:55,623 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2195 Valid, 3596 Invalid, 4779 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 4680 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-12-14 15:10:55,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1425 states. [2022-12-14 15:10:57,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1425 to 913. [2022-12-14 15:10:57,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 913 states, 912 states have (on average 1.1030701754385965) internal successors, (1006), 912 states have internal predecessors, (1006), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:10:57,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 913 states to 913 states and 1006 transitions. [2022-12-14 15:10:57,336 INFO L78 Accepts]: Start accepts. Automaton has 913 states and 1006 transitions. Word has length 40 [2022-12-14 15:10:57,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:10:57,336 INFO L495 AbstractCegarLoop]: Abstraction has 913 states and 1006 transitions. [2022-12-14 15:10:57,336 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 1.3333333333333333) internal successors, (92), 69 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:10:57,336 INFO L276 IsEmpty]: Start isEmpty. Operand 913 states and 1006 transitions. [2022-12-14 15:10:57,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-12-14 15:10:57,337 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:10:57,337 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:10:57,341 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (104)] Ended with exit code 0 [2022-12-14 15:10:57,538 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable106,104 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:10:57,538 INFO L420 AbstractCegarLoop]: === Iteration 108 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:10:57,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:10:57,539 INFO L85 PathProgramCache]: Analyzing trace with hash 119939737, now seen corresponding path program 101 times [2022-12-14 15:10:57,539 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:10:57,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213415621] [2022-12-14 15:10:57,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:10:57,540 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:10:57,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:10:57,678 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-12-14 15:10:57,678 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:10:57,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213415621] [2022-12-14 15:10:57,678 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213415621] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:10:57,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [845862611] [2022-12-14 15:10:57,678 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:10:57,678 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:10:57,678 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:10:57,679 INFO L229 MonitoredProcess]: Starting monitored process 105 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:10:57,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Waiting until timeout for monitored process [2022-12-14 15:10:57,721 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 15:10:57,721 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:10:57,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 15:10:57,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:10:57,823 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-12-14 15:10:57,823 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:10:57,910 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-12-14 15:10:57,910 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [845862611] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:10:57,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [135926179] [2022-12-14 15:10:57,911 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:10:57,911 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:10:57,911 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:10:57,912 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:10:57,912 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:10:58,290 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:11:00,149 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '194779#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:11:00,149 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:11:00,149 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:11:00,149 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2022-12-14 15:11:00,150 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261257563] [2022-12-14 15:11:00,150 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:11:00,150 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 15:11:00,150 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:11:00,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 15:11:00,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=985, Unknown=0, NotChecked=0, Total=1260 [2022-12-14 15:11:00,150 INFO L87 Difference]: Start difference. First operand 913 states and 1006 transitions. Second operand has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:11:02,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:11:02,923 INFO L93 Difference]: Finished difference Result 968 states and 1055 transitions. [2022-12-14 15:11:02,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-12-14 15:11:02,923 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2022-12-14 15:11:02,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:11:02,924 INFO L225 Difference]: With dead ends: 968 [2022-12-14 15:11:02,924 INFO L226 Difference]: Without dead ends: 964 [2022-12-14 15:11:02,925 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 87 SyntacticMatches, 14 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1337 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=793, Invalid=2399, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 15:11:02,925 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 105 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 176 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 105 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:11:02,925 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [105 Valid, 114 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 176 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:11:02,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 964 states. [2022-12-14 15:11:04,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 964 to 892. [2022-12-14 15:11:04,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 892 states, 891 states have (on average 1.101010101010101) internal successors, (981), 891 states have internal predecessors, (981), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:11:04,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 892 states to 892 states and 981 transitions. [2022-12-14 15:11:04,762 INFO L78 Accepts]: Start accepts. Automaton has 892 states and 981 transitions. Word has length 40 [2022-12-14 15:11:04,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:11:04,762 INFO L495 AbstractCegarLoop]: Abstraction has 892 states and 981 transitions. [2022-12-14 15:11:04,762 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:11:04,763 INFO L276 IsEmpty]: Start isEmpty. Operand 892 states and 981 transitions. [2022-12-14 15:11:04,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-12-14 15:11:04,763 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:11:04,764 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:11:04,767 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (105)] Ended with exit code 0 [2022-12-14 15:11:04,964 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 105 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable107 [2022-12-14 15:11:04,964 INFO L420 AbstractCegarLoop]: === Iteration 109 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:11:04,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:11:04,965 INFO L85 PathProgramCache]: Analyzing trace with hash 98790334, now seen corresponding path program 102 times [2022-12-14 15:11:04,965 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:11:04,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1018095429] [2022-12-14 15:11:04,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:11:04,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:11:04,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:11:05,132 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-12-14 15:11:05,132 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:11:05,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1018095429] [2022-12-14 15:11:05,132 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1018095429] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:11:05,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [390179153] [2022-12-14 15:11:05,132 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:11:05,132 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:11:05,132 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:11:05,133 INFO L229 MonitoredProcess]: Starting monitored process 106 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:11:05,134 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Waiting until timeout for monitored process [2022-12-14 15:11:05,174 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:11:05,174 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:11:05,175 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 16 conjunts are in the unsatisfiable core [2022-12-14 15:11:05,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:11:05,259 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-12-14 15:11:05,259 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:11:05,345 INFO L134 CoverageAnalysis]: Checked inductivity of 107 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-12-14 15:11:05,345 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [390179153] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:11:05,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [564690804] [2022-12-14 15:11:05,346 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:11:05,346 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:11:05,346 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:11:05,346 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:11:05,346 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:11:05,700 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:11:07,292 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '198771#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:11:07,292 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:11:07,292 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:11:07,292 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2022-12-14 15:11:07,292 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886523039] [2022-12-14 15:11:07,292 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:11:07,293 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2022-12-14 15:11:07,293 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:11:07,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2022-12-14 15:11:07,293 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=982, Unknown=0, NotChecked=0, Total=1260 [2022-12-14 15:11:07,293 INFO L87 Difference]: Start difference. First operand 892 states and 981 transitions. Second operand has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:11:09,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:11:09,881 INFO L93 Difference]: Finished difference Result 1092 states and 1202 transitions. [2022-12-14 15:11:09,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-12-14 15:11:09,881 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2022-12-14 15:11:09,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:11:09,883 INFO L225 Difference]: With dead ends: 1092 [2022-12-14 15:11:09,883 INFO L226 Difference]: Without dead ends: 949 [2022-12-14 15:11:09,883 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 87 SyntacticMatches, 14 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1334 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=796, Invalid=2396, Unknown=0, NotChecked=0, Total=3192 [2022-12-14 15:11:09,883 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 177 mSDsluCounter, 319 mSDsCounter, 0 mSdLazyCounter, 384 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 363 SdHoareTripleChecker+Invalid, 392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 384 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:11:09,884 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [177 Valid, 363 Invalid, 392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 384 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-12-14 15:11:09,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 949 states. [2022-12-14 15:11:11,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 949 to 905. [2022-12-14 15:11:11,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 905 states, 904 states have (on average 1.0995575221238938) internal successors, (994), 904 states have internal predecessors, (994), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:11:11,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 905 states to 905 states and 994 transitions. [2022-12-14 15:11:11,621 INFO L78 Accepts]: Start accepts. Automaton has 905 states and 994 transitions. Word has length 40 [2022-12-14 15:11:11,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:11:11,621 INFO L495 AbstractCegarLoop]: Abstraction has 905 states and 994 transitions. [2022-12-14 15:11:11,621 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:11:11,621 INFO L276 IsEmpty]: Start isEmpty. Operand 905 states and 994 transitions. [2022-12-14 15:11:11,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-12-14 15:11:11,621 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:11:11,622 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:11:11,625 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (106)] Ended with exit code 0 [2022-12-14 15:11:11,822 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 106 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable108 [2022-12-14 15:11:11,823 INFO L420 AbstractCegarLoop]: === Iteration 110 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:11:11,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:11:11,824 INFO L85 PathProgramCache]: Analyzing trace with hash -1459855478, now seen corresponding path program 103 times [2022-12-14 15:11:11,824 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:11:11,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1297315239] [2022-12-14 15:11:11,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:11:11,825 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:11:11,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:11:12,408 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 0 proven. 184 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:11:12,408 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:11:12,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1297315239] [2022-12-14 15:11:12,409 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1297315239] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:11:12,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1305665699] [2022-12-14 15:11:12,409 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:11:12,409 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:11:12,409 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:11:12,410 INFO L229 MonitoredProcess]: Starting monitored process 107 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:11:12,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Waiting until timeout for monitored process [2022-12-14 15:11:12,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:11:12,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 78 conjunts are in the unsatisfiable core [2022-12-14 15:11:12,468 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:11:13,006 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 0 proven. 184 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:11:13,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:11:13,184 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 0 proven. 184 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:11:13,184 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1305665699] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:11:13,184 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1406969145] [2022-12-14 15:11:13,185 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:11:13,185 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:11:13,185 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:11:13,185 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:11:13,186 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:11:13,609 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:11:15,950 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '203073#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:11:15,950 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:11:15,950 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:11:15,950 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 56 [2022-12-14 15:11:15,951 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737372187] [2022-12-14 15:11:15,951 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:11:15,951 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2022-12-14 15:11:15,951 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:11:15,951 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2022-12-14 15:11:15,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=179, Invalid=4111, Unknown=0, NotChecked=0, Total=4290 [2022-12-14 15:11:15,951 INFO L87 Difference]: Start difference. First operand 905 states and 994 transitions. Second operand has 56 states, 56 states have (on average 1.1964285714285714) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:11:25,991 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:11:25,991 INFO L93 Difference]: Finished difference Result 1633 states and 1737 transitions. [2022-12-14 15:11:25,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2022-12-14 15:11:25,992 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 1.1964285714285714) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2022-12-14 15:11:25,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:11:25,993 INFO L225 Difference]: With dead ends: 1633 [2022-12-14 15:11:25,993 INFO L226 Difference]: Without dead ends: 1627 [2022-12-14 15:11:25,994 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1944 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=405, Invalid=9695, Unknown=0, NotChecked=0, Total=10100 [2022-12-14 15:11:25,994 INFO L413 NwaCegarLoop]: 77 mSDtfsCounter, 257 mSDsluCounter, 2385 mSDsCounter, 0 mSdLazyCounter, 5739 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 257 SdHoareTripleChecker+Valid, 2462 SdHoareTripleChecker+Invalid, 5740 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 5739 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2022-12-14 15:11:25,994 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [257 Valid, 2462 Invalid, 5740 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 5739 Invalid, 0 Unknown, 0 Unchecked, 1.9s Time] [2022-12-14 15:11:25,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1627 states. [2022-12-14 15:11:27,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1627 to 911. [2022-12-14 15:11:27,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 911 states, 910 states have (on average 1.1) internal successors, (1001), 910 states have internal predecessors, (1001), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:11:27,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 911 states to 911 states and 1001 transitions. [2022-12-14 15:11:27,704 INFO L78 Accepts]: Start accepts. Automaton has 911 states and 1001 transitions. Word has length 41 [2022-12-14 15:11:27,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:11:27,704 INFO L495 AbstractCegarLoop]: Abstraction has 911 states and 1001 transitions. [2022-12-14 15:11:27,704 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 1.1964285714285714) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:11:27,704 INFO L276 IsEmpty]: Start isEmpty. Operand 911 states and 1001 transitions. [2022-12-14 15:11:27,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-12-14 15:11:27,705 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:11:27,705 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:11:27,709 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (107)] Ended with exit code 0 [2022-12-14 15:11:27,905 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable109,107 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:11:27,905 INFO L420 AbstractCegarLoop]: === Iteration 111 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:11:27,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:11:27,906 INFO L85 PathProgramCache]: Analyzing trace with hash -1250065840, now seen corresponding path program 104 times [2022-12-14 15:11:27,906 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:11:27,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962014419] [2022-12-14 15:11:27,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:11:27,907 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:11:27,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:11:28,545 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 138 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:11:28,545 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:11:28,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962014419] [2022-12-14 15:11:28,545 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1962014419] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:11:28,545 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1105080030] [2022-12-14 15:11:28,545 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:11:28,545 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:11:28,545 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:11:28,546 INFO L229 MonitoredProcess]: Starting monitored process 108 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:11:28,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Waiting until timeout for monitored process [2022-12-14 15:11:28,603 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-12-14 15:11:28,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:11:28,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 74 conjunts are in the unsatisfiable core [2022-12-14 15:11:28,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:11:29,223 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 138 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:11:29,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:11:29,389 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 138 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:11:29,389 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1105080030] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:11:29,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1031148076] [2022-12-14 15:11:29,389 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:11:29,390 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:11:29,390 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:11:29,390 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:11:29,390 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:11:29,705 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:11:32,082 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '208463#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:11:32,082 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:11:32,082 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:11:32,082 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 54 [2022-12-14 15:11:32,082 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842171857] [2022-12-14 15:11:32,082 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:11:32,082 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-12-14 15:11:32,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:11:32,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-12-14 15:11:32,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=3854, Unknown=0, NotChecked=0, Total=4032 [2022-12-14 15:11:32,083 INFO L87 Difference]: Start difference. First operand 911 states and 1001 transitions. Second operand has 54 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:11:40,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:11:40,794 INFO L93 Difference]: Finished difference Result 1420 states and 1509 transitions. [2022-12-14 15:11:40,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-12-14 15:11:40,795 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2022-12-14 15:11:40,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:11:40,796 INFO L225 Difference]: With dead ends: 1420 [2022-12-14 15:11:40,797 INFO L226 Difference]: Without dead ends: 1395 [2022-12-14 15:11:40,797 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 88 SyntacticMatches, 5 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1765 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=377, Invalid=8743, Unknown=0, NotChecked=0, Total=9120 [2022-12-14 15:11:40,797 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 210 mSDsluCounter, 2193 mSDsCounter, 0 mSdLazyCounter, 5422 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 2260 SdHoareTripleChecker+Invalid, 5423 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 5422 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-12-14 15:11:40,797 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [210 Valid, 2260 Invalid, 5423 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 5422 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-12-14 15:11:40,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1395 states. [2022-12-14 15:11:42,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1395 to 905. [2022-12-14 15:11:42,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 905 states, 904 states have (on average 1.0995575221238938) internal successors, (994), 904 states have internal predecessors, (994), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:11:42,491 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 905 states to 905 states and 994 transitions. [2022-12-14 15:11:42,492 INFO L78 Accepts]: Start accepts. Automaton has 905 states and 994 transitions. Word has length 41 [2022-12-14 15:11:42,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:11:42,492 INFO L495 AbstractCegarLoop]: Abstraction has 905 states and 994 transitions. [2022-12-14 15:11:42,492 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 54 states have (on average 1.2222222222222223) internal successors, (66), 54 states have internal predecessors, (66), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:11:42,492 INFO L276 IsEmpty]: Start isEmpty. Operand 905 states and 994 transitions. [2022-12-14 15:11:42,492 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-12-14 15:11:42,492 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:11:42,493 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:11:42,497 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (108)] Ended with exit code 0 [2022-12-14 15:11:42,693 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable110,108 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:11:42,694 INFO L420 AbstractCegarLoop]: === Iteration 112 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:11:42,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:11:42,694 INFO L85 PathProgramCache]: Analyzing trace with hash 115340746, now seen corresponding path program 105 times [2022-12-14 15:11:42,695 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:11:42,695 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1895255547] [2022-12-14 15:11:42,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:11:42,695 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:11:42,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:11:43,180 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:11:43,181 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:11:43,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1895255547] [2022-12-14 15:11:43,181 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1895255547] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:11:43,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1039607395] [2022-12-14 15:11:43,181 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:11:43,181 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:11:43,181 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:11:43,182 INFO L229 MonitoredProcess]: Starting monitored process 109 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:11:43,182 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Waiting until timeout for monitored process [2022-12-14 15:11:43,239 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:11:43,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:11:43,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 70 conjunts are in the unsatisfiable core [2022-12-14 15:11:43,242 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:11:43,812 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:11:43,812 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:11:44,017 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 102 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:11:44,018 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1039607395] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:11:44,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [785270970] [2022-12-14 15:11:44,018 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:11:44,018 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:11:44,018 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:11:44,018 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:11:44,019 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:11:44,331 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:11:46,660 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '213419#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:11:46,660 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:11:46,660 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:11:46,660 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 52 [2022-12-14 15:11:46,660 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621075391] [2022-12-14 15:11:46,660 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:11:46,660 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2022-12-14 15:11:46,661 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:11:46,661 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2022-12-14 15:11:46,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=3605, Unknown=0, NotChecked=0, Total=3782 [2022-12-14 15:11:46,661 INFO L87 Difference]: Start difference. First operand 905 states and 994 transitions. Second operand has 52 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 52 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:11:53,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:11:53,672 INFO L93 Difference]: Finished difference Result 1250 states and 1338 transitions. [2022-12-14 15:11:53,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-12-14 15:11:53,672 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 52 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2022-12-14 15:11:53,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:11:53,673 INFO L225 Difference]: With dead ends: 1250 [2022-12-14 15:11:53,673 INFO L226 Difference]: Without dead ends: 1224 [2022-12-14 15:11:53,674 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 88 SyntacticMatches, 5 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1648 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=372, Invalid=8000, Unknown=0, NotChecked=0, Total=8372 [2022-12-14 15:11:53,674 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 184 mSDsluCounter, 1575 mSDsCounter, 0 mSdLazyCounter, 4042 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 1630 SdHoareTripleChecker+Invalid, 4043 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 4042 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2022-12-14 15:11:53,674 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [184 Valid, 1630 Invalid, 4043 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 4042 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2022-12-14 15:11:53,675 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1224 states. [2022-12-14 15:11:55,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1224 to 897. [2022-12-14 15:11:55,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 897 states, 896 states have (on average 1.0993303571428572) internal successors, (985), 896 states have internal predecessors, (985), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:11:55,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 897 states to 897 states and 985 transitions. [2022-12-14 15:11:55,344 INFO L78 Accepts]: Start accepts. Automaton has 897 states and 985 transitions. Word has length 41 [2022-12-14 15:11:55,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:11:55,344 INFO L495 AbstractCegarLoop]: Abstraction has 897 states and 985 transitions. [2022-12-14 15:11:55,344 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 1.2307692307692308) internal successors, (64), 52 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:11:55,345 INFO L276 IsEmpty]: Start isEmpty. Operand 897 states and 985 transitions. [2022-12-14 15:11:55,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-12-14 15:11:55,345 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:11:55,345 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:11:55,349 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (109)] Ended with exit code 0 [2022-12-14 15:11:55,546 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 109 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable111 [2022-12-14 15:11:55,546 INFO L420 AbstractCegarLoop]: === Iteration 113 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:11:55,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:11:55,547 INFO L85 PathProgramCache]: Analyzing trace with hash -395377648, now seen corresponding path program 106 times [2022-12-14 15:11:55,547 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:11:55,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1197489033] [2022-12-14 15:11:55,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:11:55,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:11:55,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:11:56,133 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:11:56,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:11:56,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1197489033] [2022-12-14 15:11:56,133 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1197489033] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:11:56,133 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1933008235] [2022-12-14 15:11:56,133 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:11:56,133 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:11:56,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:11:56,134 INFO L229 MonitoredProcess]: Starting monitored process 110 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:11:56,135 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Waiting until timeout for monitored process [2022-12-14 15:11:56,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:11:56,176 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 66 conjunts are in the unsatisfiable core [2022-12-14 15:11:56,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:11:56,637 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:11:56,638 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:11:56,805 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 76 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:11:56,806 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1933008235] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:11:56,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [849481288] [2022-12-14 15:11:56,806 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:11:56,807 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:11:56,807 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:11:56,807 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:11:56,807 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:11:57,136 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:11:59,399 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '218021#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:11:59,400 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:11:59,400 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:11:59,400 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 50 [2022-12-14 15:11:59,400 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615593948] [2022-12-14 15:11:59,400 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:11:59,400 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2022-12-14 15:11:59,400 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:11:59,401 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2022-12-14 15:11:59,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=3364, Unknown=0, NotChecked=0, Total=3540 [2022-12-14 15:11:59,401 INFO L87 Difference]: Start difference. First operand 897 states and 985 transitions. Second operand has 50 states, 50 states have (on average 1.24) internal successors, (62), 50 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:12:05,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:12:05,211 INFO L93 Difference]: Finished difference Result 1119 states and 1206 transitions. [2022-12-14 15:12:05,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-12-14 15:12:05,212 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.24) internal successors, (62), 50 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2022-12-14 15:12:05,212 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:12:05,212 INFO L225 Difference]: With dead ends: 1119 [2022-12-14 15:12:05,212 INFO L226 Difference]: Without dead ends: 1092 [2022-12-14 15:12:05,213 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 88 SyntacticMatches, 5 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1535 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=367, Invalid=7289, Unknown=0, NotChecked=0, Total=7656 [2022-12-14 15:12:05,213 INFO L413 NwaCegarLoop]: 43 mSDtfsCounter, 153 mSDsluCounter, 1206 mSDsCounter, 0 mSdLazyCounter, 2997 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 1249 SdHoareTripleChecker+Invalid, 2998 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 2997 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:12:05,213 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [153 Valid, 1249 Invalid, 2998 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 2997 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2022-12-14 15:12:05,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1092 states. [2022-12-14 15:12:07,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1092 to 887. [2022-12-14 15:12:07,209 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 887 states, 886 states have (on average 1.0993227990970655) internal successors, (974), 886 states have internal predecessors, (974), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:12:07,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 887 states to 887 states and 974 transitions. [2022-12-14 15:12:07,210 INFO L78 Accepts]: Start accepts. Automaton has 887 states and 974 transitions. Word has length 41 [2022-12-14 15:12:07,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:12:07,210 INFO L495 AbstractCegarLoop]: Abstraction has 887 states and 974 transitions. [2022-12-14 15:12:07,210 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.24) internal successors, (62), 50 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:12:07,210 INFO L276 IsEmpty]: Start isEmpty. Operand 887 states and 974 transitions. [2022-12-14 15:12:07,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-12-14 15:12:07,210 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:12:07,210 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:12:07,215 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (110)] Forceful destruction successful, exit code 0 [2022-12-14 15:12:07,411 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 110 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable112 [2022-12-14 15:12:07,412 INFO L420 AbstractCegarLoop]: === Iteration 114 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:12:07,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:12:07,412 INFO L85 PathProgramCache]: Analyzing trace with hash 540171274, now seen corresponding path program 107 times [2022-12-14 15:12:07,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:12:07,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [319647489] [2022-12-14 15:12:07,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:12:07,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:12:07,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:12:07,939 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:12:07,939 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:12:07,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [319647489] [2022-12-14 15:12:07,940 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [319647489] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:12:07,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [980587740] [2022-12-14 15:12:07,940 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:12:07,940 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:12:07,940 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:12:07,941 INFO L229 MonitoredProcess]: Starting monitored process 111 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:12:07,941 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Waiting until timeout for monitored process [2022-12-14 15:12:07,998 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2022-12-14 15:12:07,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:12:08,000 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 62 conjunts are in the unsatisfiable core [2022-12-14 15:12:08,001 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:12:08,624 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:12:08,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:12:08,830 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:12:08,830 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [980587740] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:12:08,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [918408786] [2022-12-14 15:12:08,831 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:12:08,831 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:12:08,832 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:12:08,832 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:12:08,832 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:12:09,179 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:12:11,867 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '222343#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:12:11,867 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:12:11,867 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:12:11,868 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 48 [2022-12-14 15:12:11,868 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1012590333] [2022-12-14 15:12:11,868 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:12:11,868 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-12-14 15:12:11,868 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:12:11,868 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-12-14 15:12:11,869 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=3131, Unknown=0, NotChecked=0, Total=3306 [2022-12-14 15:12:11,869 INFO L87 Difference]: Start difference. First operand 887 states and 974 transitions. Second operand has 48 states, 48 states have (on average 1.25) internal successors, (60), 48 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:12:16,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:12:16,587 INFO L93 Difference]: Finished difference Result 1019 states and 1105 transitions. [2022-12-14 15:12:16,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-12-14 15:12:16,588 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.25) internal successors, (60), 48 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2022-12-14 15:12:16,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:12:16,589 INFO L225 Difference]: With dead ends: 1019 [2022-12-14 15:12:16,589 INFO L226 Difference]: Without dead ends: 991 [2022-12-14 15:12:16,589 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 88 SyntacticMatches, 5 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1426 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=362, Invalid=6610, Unknown=0, NotChecked=0, Total=6972 [2022-12-14 15:12:16,590 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 122 mSDsluCounter, 751 mSDsCounter, 0 mSdLazyCounter, 1980 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 782 SdHoareTripleChecker+Invalid, 1981 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1980 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-12-14 15:12:16,590 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 782 Invalid, 1981 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1980 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-12-14 15:12:16,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 991 states. [2022-12-14 15:12:18,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 991 to 875. [2022-12-14 15:12:18,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 875 states, 874 states have (on average 1.09954233409611) internal successors, (961), 874 states have internal predecessors, (961), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:12:18,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 875 states to 875 states and 961 transitions. [2022-12-14 15:12:18,326 INFO L78 Accepts]: Start accepts. Automaton has 875 states and 961 transitions. Word has length 41 [2022-12-14 15:12:18,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:12:18,326 INFO L495 AbstractCegarLoop]: Abstraction has 875 states and 961 transitions. [2022-12-14 15:12:18,326 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.25) internal successors, (60), 48 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:12:18,326 INFO L276 IsEmpty]: Start isEmpty. Operand 875 states and 961 transitions. [2022-12-14 15:12:18,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-12-14 15:12:18,327 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:12:18,327 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:12:18,331 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (111)] Ended with exit code 0 [2022-12-14 15:12:18,527 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 111 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable113 [2022-12-14 15:12:18,528 INFO L420 AbstractCegarLoop]: === Iteration 115 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:12:18,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:12:18,529 INFO L85 PathProgramCache]: Analyzing trace with hash 572503504, now seen corresponding path program 108 times [2022-12-14 15:12:18,529 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:12:18,530 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1921630166] [2022-12-14 15:12:18,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:12:18,530 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:12:18,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:12:18,904 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 15:12:18,905 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:12:18,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1921630166] [2022-12-14 15:12:18,905 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1921630166] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:12:18,905 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [325092642] [2022-12-14 15:12:18,905 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:12:18,905 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:12:18,905 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:12:18,906 INFO L229 MonitoredProcess]: Starting monitored process 112 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:12:18,907 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Waiting until timeout for monitored process [2022-12-14 15:12:18,948 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:12:18,948 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:12:18,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 58 conjunts are in the unsatisfiable core [2022-12-14 15:12:18,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:12:19,531 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 15:12:19,531 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:12:19,713 INFO L134 CoverageAnalysis]: Checked inductivity of 96 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2022-12-14 15:12:19,713 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [325092642] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:12:19,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [522896976] [2022-12-14 15:12:19,714 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:12:19,714 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:12:19,715 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:12:19,715 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:12:19,715 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:12:20,229 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:12:22,242 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '226443#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:12:22,242 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:12:22,243 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:12:22,243 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 46 [2022-12-14 15:12:22,243 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217415953] [2022-12-14 15:12:22,243 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:12:22,243 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2022-12-14 15:12:22,243 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:12:22,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2022-12-14 15:12:22,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=2906, Unknown=0, NotChecked=0, Total=3080 [2022-12-14 15:12:22,244 INFO L87 Difference]: Start difference. First operand 875 states and 961 transitions. Second operand has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 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 15:12:25,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:12:25,640 INFO L93 Difference]: Finished difference Result 935 states and 1020 transitions. [2022-12-14 15:12:25,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-12-14 15:12:25,641 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 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 41 [2022-12-14 15:12:25,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:12:25,641 INFO L225 Difference]: With dead ends: 935 [2022-12-14 15:12:25,641 INFO L226 Difference]: Without dead ends: 906 [2022-12-14 15:12:25,642 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 88 SyntacticMatches, 5 SemanticMatches, 78 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1321 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=357, Invalid=5963, Unknown=0, NotChecked=0, Total=6320 [2022-12-14 15:12:25,642 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 94 mSDsluCounter, 437 mSDsCounter, 0 mSdLazyCounter, 1359 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 456 SdHoareTripleChecker+Invalid, 1360 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 1359 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-12-14 15:12:25,642 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 456 Invalid, 1360 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 1359 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-12-14 15:12:25,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 906 states. [2022-12-14 15:12:27,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 906 to 861. [2022-12-14 15:12:27,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 861 states, 860 states have (on average 1.1) internal successors, (946), 860 states have internal predecessors, (946), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:12:27,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 861 states to 861 states and 946 transitions. [2022-12-14 15:12:27,313 INFO L78 Accepts]: Start accepts. Automaton has 861 states and 946 transitions. Word has length 41 [2022-12-14 15:12:27,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:12:27,313 INFO L495 AbstractCegarLoop]: Abstraction has 861 states and 946 transitions. [2022-12-14 15:12:27,313 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.2608695652173914) internal successors, (58), 46 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 15:12:27,313 INFO L276 IsEmpty]: Start isEmpty. Operand 861 states and 946 transitions. [2022-12-14 15:12:27,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2022-12-14 15:12:27,314 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:12:27,314 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:12:27,318 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (112)] Ended with exit code 0 [2022-12-14 15:12:27,514 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 112 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable114 [2022-12-14 15:12:27,514 INFO L420 AbstractCegarLoop]: === Iteration 116 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:12:27,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:12:27,515 INFO L85 PathProgramCache]: Analyzing trace with hash -606629302, now seen corresponding path program 109 times [2022-12-14 15:12:27,515 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:12:27,516 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817194767] [2022-12-14 15:12:27,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:12:27,516 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:12:27,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:12:27,929 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2022-12-14 15:12:27,929 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:12:27,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [817194767] [2022-12-14 15:12:27,929 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [817194767] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:12:27,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1329692480] [2022-12-14 15:12:27,930 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:12:27,930 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:12:27,930 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:12:27,931 INFO L229 MonitoredProcess]: Starting monitored process 113 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:12:27,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Waiting until timeout for monitored process [2022-12-14 15:12:27,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:12:27,988 INFO L263 TraceCheckSpWp]: Trace formula consists of 264 conjuncts, 54 conjunts are in the unsatisfiable core [2022-12-14 15:12:27,989 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:12:28,497 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2022-12-14 15:12:28,497 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:12:28,683 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 58 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2022-12-14 15:12:28,684 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1329692480] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:12:28,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1575415726] [2022-12-14 15:12:28,684 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:12:28,685 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:12:28,685 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:12:28,685 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:12:28,685 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:12:29,036 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:12:31,470 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '230349#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:12:31,470 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:12:31,470 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:12:31,470 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 44 [2022-12-14 15:12:31,470 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123324861] [2022-12-14 15:12:31,470 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:12:31,470 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2022-12-14 15:12:31,470 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:12:31,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2022-12-14 15:12:31,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=2689, Unknown=0, NotChecked=0, Total=2862 [2022-12-14 15:12:31,471 INFO L87 Difference]: Start difference. First operand 861 states and 946 transitions. Second operand has 44 states, 44 states have (on average 1.2727272727272727) internal successors, (56), 44 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 15:12:34,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:12:34,726 INFO L93 Difference]: Finished difference Result 903 states and 990 transitions. [2022-12-14 15:12:34,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-12-14 15:12:34,726 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.2727272727272727) internal successors, (56), 44 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 41 [2022-12-14 15:12:34,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:12:34,727 INFO L225 Difference]: With dead ends: 903 [2022-12-14 15:12:34,727 INFO L226 Difference]: Without dead ends: 899 [2022-12-14 15:12:34,727 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 88 SyntacticMatches, 5 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1221 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=352, Invalid=5348, Unknown=0, NotChecked=0, Total=5700 [2022-12-14 15:12:34,727 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 76 mSDsluCounter, 309 mSDsCounter, 0 mSdLazyCounter, 942 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 320 SdHoareTripleChecker+Invalid, 943 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 942 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2022-12-14 15:12:34,728 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 320 Invalid, 943 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 942 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2022-12-14 15:12:34,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 899 states. [2022-12-14 15:12:36,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 899 to 873. [2022-12-14 15:12:36,478 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 873 states, 872 states have (on average 1.1009174311926606) internal successors, (960), 872 states have internal predecessors, (960), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:12:36,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 873 states to 873 states and 960 transitions. [2022-12-14 15:12:36,479 INFO L78 Accepts]: Start accepts. Automaton has 873 states and 960 transitions. Word has length 41 [2022-12-14 15:12:36,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:12:36,479 INFO L495 AbstractCegarLoop]: Abstraction has 873 states and 960 transitions. [2022-12-14 15:12:36,479 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.2727272727272727) internal successors, (56), 44 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 15:12:36,479 INFO L276 IsEmpty]: Start isEmpty. Operand 873 states and 960 transitions. [2022-12-14 15:12:36,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-12-14 15:12:36,480 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:12:36,480 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:12:36,484 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (113)] Ended with exit code 0 [2022-12-14 15:12:36,680 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 113 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable115 [2022-12-14 15:12:36,681 INFO L420 AbstractCegarLoop]: === Iteration 117 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:12:36,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:12:36,682 INFO L85 PathProgramCache]: Analyzing trace with hash -1842998684, now seen corresponding path program 110 times [2022-12-14 15:12:36,682 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:12:36,682 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [383392532] [2022-12-14 15:12:36,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:12:36,683 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:12:36,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:12:37,136 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 14 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:12:37,136 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:12:37,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [383392532] [2022-12-14 15:12:37,137 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [383392532] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:12:37,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [112437740] [2022-12-14 15:12:37,137 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:12:37,137 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:12:37,137 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:12:37,138 INFO L229 MonitoredProcess]: Starting monitored process 114 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:12:37,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Waiting until timeout for monitored process [2022-12-14 15:12:37,197 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-12-14 15:12:37,197 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:12:37,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 38 conjunts are in the unsatisfiable core [2022-12-14 15:12:37,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:12:38,302 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 14 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:12:38,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:12:39,339 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 14 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:12:39,339 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [112437740] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:12:39,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1112876898] [2022-12-14 15:12:39,340 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:12:39,340 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:12:39,340 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:12:39,340 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:12:39,340 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:12:39,695 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:12:42,659 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '234251#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:12:42,659 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:12:42,659 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:12:42,659 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 74 [2022-12-14 15:12:42,659 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1935958843] [2022-12-14 15:12:42,659 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:12:42,660 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2022-12-14 15:12:42,660 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:12:42,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2022-12-14 15:12:42,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=6723, Unknown=0, NotChecked=0, Total=6972 [2022-12-14 15:12:42,661 INFO L87 Difference]: Start difference. First operand 873 states and 960 transitions. Second operand has 74 states, 74 states have (on average 1.3108108108108107) internal successors, (97), 74 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 15:13:03,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:13:03,710 INFO L93 Difference]: Finished difference Result 1561 states and 1669 transitions. [2022-12-14 15:13:03,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 146 states. [2022-12-14 15:13:03,711 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 1.3108108108108107) internal successors, (97), 74 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) Word has length 42 [2022-12-14 15:13:03,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:13:03,712 INFO L225 Difference]: With dead ends: 1561 [2022-12-14 15:13:03,712 INFO L226 Difference]: Without dead ends: 1517 [2022-12-14 15:13:03,714 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 297 GetRequests, 59 SyntacticMatches, 14 SemanticMatches, 224 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11130 ImplicationChecksByTransitivity, 17.5s TimeCoverageRelationStatistics Valid=9262, Invalid=41588, Unknown=0, NotChecked=0, Total=50850 [2022-12-14 15:13:03,714 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 3131 mSDsluCounter, 1331 mSDsCounter, 0 mSdLazyCounter, 3297 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3131 SdHoareTripleChecker+Valid, 1388 SdHoareTripleChecker+Invalid, 3407 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 3297 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:13:03,714 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3131 Valid, 1388 Invalid, 3407 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 3297 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-12-14 15:13:03,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1517 states. [2022-12-14 15:13:05,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1517 to 946. [2022-12-14 15:13:05,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 946 states, 945 states have (on average 1.1005291005291005) internal successors, (1040), 945 states have internal predecessors, (1040), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:13:05,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 946 states to 946 states and 1040 transitions. [2022-12-14 15:13:05,575 INFO L78 Accepts]: Start accepts. Automaton has 946 states and 1040 transitions. Word has length 42 [2022-12-14 15:13:05,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:13:05,575 INFO L495 AbstractCegarLoop]: Abstraction has 946 states and 1040 transitions. [2022-12-14 15:13:05,575 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 1.3108108108108107) internal successors, (97), 74 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 15:13:05,575 INFO L276 IsEmpty]: Start isEmpty. Operand 946 states and 1040 transitions. [2022-12-14 15:13:05,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-12-14 15:13:05,576 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:13:05,576 INFO L195 NwaCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:13:05,579 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (114)] Ended with exit code 0 [2022-12-14 15:13:05,776 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable116,114 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:13:05,776 INFO L420 AbstractCegarLoop]: === Iteration 118 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:13:05,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:13:05,776 INFO L85 PathProgramCache]: Analyzing trace with hash 786228663, now seen corresponding path program 111 times [2022-12-14 15:13:05,777 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:13:05,777 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [711264493] [2022-12-14 15:13:05,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:13:05,777 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:13:05,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:13:06,226 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:13:06,226 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:13:06,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [711264493] [2022-12-14 15:13:06,226 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [711264493] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:13:06,226 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2140690633] [2022-12-14 15:13:06,226 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:13:06,227 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:13:06,227 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:13:06,227 INFO L229 MonitoredProcess]: Starting monitored process 115 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:13:06,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Waiting until timeout for monitored process [2022-12-14 15:13:06,268 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:13:06,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:13:06,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 38 conjunts are in the unsatisfiable core [2022-12-14 15:13:06,271 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:13:07,429 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:13:07,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:13:08,524 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 14 proven. 182 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-12-14 15:13:08,524 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2140690633] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:13:08,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2080714979] [2022-12-14 15:13:08,525 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:13:08,525 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:13:08,526 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:13:08,526 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:13:08,526 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:13:08,988 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:13:12,275 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '239811#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:13:12,275 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:13:12,275 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:13:12,275 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 74 [2022-12-14 15:13:12,275 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107188615] [2022-12-14 15:13:12,275 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:13:12,275 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 74 states [2022-12-14 15:13:12,275 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:13:12,276 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2022-12-14 15:13:12,276 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=249, Invalid=6723, Unknown=0, NotChecked=0, Total=6972 [2022-12-14 15:13:12,276 INFO L87 Difference]: Start difference. First operand 946 states and 1040 transitions. Second operand has 74 states, 74 states have (on average 1.3108108108108107) internal successors, (97), 74 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 15:13:25,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:13:25,389 INFO L93 Difference]: Finished difference Result 1543 states and 1644 transitions. [2022-12-14 15:13:25,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2022-12-14 15:13:25,389 INFO L78 Accepts]: Start accepts. Automaton has has 74 states, 74 states have (on average 1.3108108108108107) internal successors, (97), 74 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) Word has length 42 [2022-12-14 15:13:25,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:13:25,390 INFO L225 Difference]: With dead ends: 1543 [2022-12-14 15:13:25,390 INFO L226 Difference]: Without dead ends: 1524 [2022-12-14 15:13:25,391 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 59 SyntacticMatches, 14 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2248 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=1002, Invalid=14004, Unknown=0, NotChecked=0, Total=15006 [2022-12-14 15:13:25,391 INFO L413 NwaCegarLoop]: 98 mSDtfsCounter, 2658 mSDsluCounter, 4170 mSDsCounter, 0 mSdLazyCounter, 5642 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2658 SdHoareTripleChecker+Valid, 4268 SdHoareTripleChecker+Invalid, 5757 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 5642 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:13:25,391 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2658 Valid, 4268 Invalid, 5757 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 5642 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-12-14 15:13:25,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1524 states. [2022-12-14 15:13:27,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1524 to 953. [2022-12-14 15:13:27,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 953 states, 952 states have (on average 1.0997899159663866) internal successors, (1047), 952 states have internal predecessors, (1047), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:13:27,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 953 states to 953 states and 1047 transitions. [2022-12-14 15:13:27,339 INFO L78 Accepts]: Start accepts. Automaton has 953 states and 1047 transitions. Word has length 42 [2022-12-14 15:13:27,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:13:27,339 INFO L495 AbstractCegarLoop]: Abstraction has 953 states and 1047 transitions. [2022-12-14 15:13:27,339 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 74 states, 74 states have (on average 1.3108108108108107) internal successors, (97), 74 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 15:13:27,339 INFO L276 IsEmpty]: Start isEmpty. Operand 953 states and 1047 transitions. [2022-12-14 15:13:27,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-12-14 15:13:27,339 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:13:27,340 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:13:27,343 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (115)] Ended with exit code 0 [2022-12-14 15:13:27,540 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable117,115 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:13:27,540 INFO L420 AbstractCegarLoop]: === Iteration 119 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:13:27,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:13:27,541 INFO L85 PathProgramCache]: Analyzing trace with hash -999801538, now seen corresponding path program 112 times [2022-12-14 15:13:27,541 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:13:27,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1395631835] [2022-12-14 15:13:27,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:13:27,542 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:13:27,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:13:27,703 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-12-14 15:13:27,703 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:13:27,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1395631835] [2022-12-14 15:13:27,704 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1395631835] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:13:27,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478944114] [2022-12-14 15:13:27,704 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:13:27,704 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:13:27,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:13:27,705 INFO L229 MonitoredProcess]: Starting monitored process 116 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:13:27,706 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Waiting until timeout for monitored process [2022-12-14 15:13:27,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:13:27,748 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 17 conjunts are in the unsatisfiable core [2022-12-14 15:13:27,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:13:27,862 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-12-14 15:13:27,862 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:13:27,938 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-12-14 15:13:27,938 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [478944114] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:13:27,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [423848919] [2022-12-14 15:13:27,939 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:13:27,939 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:13:27,940 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:13:27,940 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:13:27,940 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:13:28,268 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:13:29,989 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '245097#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:13:29,989 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:13:29,989 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:13:29,990 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2022-12-14 15:13:29,990 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1250105428] [2022-12-14 15:13:29,990 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:13:29,990 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 15:13:29,990 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:13:29,990 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 15:13:29,990 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=1171, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 15:13:29,990 INFO L87 Difference]: Start difference. First operand 953 states and 1047 transitions. Second operand has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:13:33,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:13:33,777 INFO L93 Difference]: Finished difference Result 1448 states and 1609 transitions. [2022-12-14 15:13:33,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-12-14 15:13:33,778 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2022-12-14 15:13:33,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:13:33,779 INFO L225 Difference]: With dead ends: 1448 [2022-12-14 15:13:33,779 INFO L226 Difference]: Without dead ends: 1281 [2022-12-14 15:13:33,780 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 91 SyntacticMatches, 15 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1291 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=762, Invalid=3398, Unknown=0, NotChecked=0, Total=4160 [2022-12-14 15:13:33,780 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 345 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 513 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 345 SdHoareTripleChecker+Valid, 275 SdHoareTripleChecker+Invalid, 521 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 513 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:13:33,780 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [345 Valid, 275 Invalid, 521 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 513 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:13:33,781 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1281 states. [2022-12-14 15:13:36,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1281 to 1081. [2022-12-14 15:13:36,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1081 states, 1080 states have (on average 1.1018518518518519) internal successors, (1190), 1080 states have internal predecessors, (1190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:13:36,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1081 states to 1081 states and 1190 transitions. [2022-12-14 15:13:36,060 INFO L78 Accepts]: Start accepts. Automaton has 1081 states and 1190 transitions. Word has length 42 [2022-12-14 15:13:36,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:13:36,061 INFO L495 AbstractCegarLoop]: Abstraction has 1081 states and 1190 transitions. [2022-12-14 15:13:36,061 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:13:36,061 INFO L276 IsEmpty]: Start isEmpty. Operand 1081 states and 1190 transitions. [2022-12-14 15:13:36,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2022-12-14 15:13:36,061 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:13:36,061 INFO L195 NwaCegarLoop]: trace histogram [8, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:13:36,065 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (116)] Ended with exit code 0 [2022-12-14 15:13:36,262 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 116 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable118 [2022-12-14 15:13:36,262 INFO L420 AbstractCegarLoop]: === Iteration 120 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:13:36,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:13:36,263 INFO L85 PathProgramCache]: Analyzing trace with hash -1655433031, now seen corresponding path program 113 times [2022-12-14 15:13:36,264 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:13:36,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [938705233] [2022-12-14 15:13:36,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:13:36,265 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:13:36,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:13:36,450 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-12-14 15:13:36,451 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:13:36,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [938705233] [2022-12-14 15:13:36,451 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [938705233] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:13:36,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [250498318] [2022-12-14 15:13:36,451 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:13:36,451 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:13:36,451 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:13:36,452 INFO L229 MonitoredProcess]: Starting monitored process 117 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:13:36,452 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Waiting until timeout for monitored process [2022-12-14 15:13:36,494 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2022-12-14 15:13:36,494 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:13:36,495 INFO L263 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 17 conjunts are in the unsatisfiable core [2022-12-14 15:13:36,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:13:36,613 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-12-14 15:13:36,613 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:13:36,713 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-12-14 15:13:36,713 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [250498318] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:13:36,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1891174078] [2022-12-14 15:13:36,713 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:13:36,713 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:13:36,714 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:13:36,714 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:13:36,714 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:13:37,047 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:13:38,639 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '250449#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:13:38,640 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:13:38,640 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:13:38,640 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2022-12-14 15:13:38,640 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588509100] [2022-12-14 15:13:38,640 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:13:38,640 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2022-12-14 15:13:38,640 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:13:38,640 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2022-12-14 15:13:38,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=1147, Unknown=0, NotChecked=0, Total=1406 [2022-12-14 15:13:38,641 INFO L87 Difference]: Start difference. First operand 1081 states and 1190 transitions. Second operand has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:13:42,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:13:42,147 INFO L93 Difference]: Finished difference Result 1196 states and 1315 transitions. [2022-12-14 15:13:42,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2022-12-14 15:13:42,148 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 42 [2022-12-14 15:13:42,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:13:42,149 INFO L225 Difference]: With dead ends: 1196 [2022-12-14 15:13:42,149 INFO L226 Difference]: Without dead ends: 1181 [2022-12-14 15:13:42,149 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 91 SyntacticMatches, 15 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1304 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=786, Invalid=3374, Unknown=0, NotChecked=0, Total=4160 [2022-12-14 15:13:42,149 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 200 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 357 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 200 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 366 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 357 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:13:42,149 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [200 Valid, 173 Invalid, 366 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 357 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-12-14 15:13:42,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1181 states. [2022-12-14 15:13:44,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1181 to 1126. [2022-12-14 15:13:44,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1126 states, 1125 states have (on average 1.1111111111111112) internal successors, (1250), 1125 states have internal predecessors, (1250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:13:44,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1126 states to 1126 states and 1250 transitions. [2022-12-14 15:13:44,735 INFO L78 Accepts]: Start accepts. Automaton has 1126 states and 1250 transitions. Word has length 42 [2022-12-14 15:13:44,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:13:44,735 INFO L495 AbstractCegarLoop]: Abstraction has 1126 states and 1250 transitions. [2022-12-14 15:13:44,735 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.5357142857142858) internal successors, (43), 28 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:13:44,735 INFO L276 IsEmpty]: Start isEmpty. Operand 1126 states and 1250 transitions. [2022-12-14 15:13:44,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-12-14 15:13:44,736 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:13:44,736 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:13:44,740 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (117)] Ended with exit code 0 [2022-12-14 15:13:44,936 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 117 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable119 [2022-12-14 15:13:44,937 INFO L420 AbstractCegarLoop]: === Iteration 121 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:13:44,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:13:44,937 INFO L85 PathProgramCache]: Analyzing trace with hash -933867049, now seen corresponding path program 114 times [2022-12-14 15:13:44,938 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:13:44,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1601985181] [2022-12-14 15:13:44,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:13:44,938 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:13:44,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:13:45,599 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:13:45,600 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:13:45,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1601985181] [2022-12-14 15:13:45,600 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1601985181] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:13:45,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1061349199] [2022-12-14 15:13:45,600 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:13:45,600 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:13:45,600 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:13:45,601 INFO L229 MonitoredProcess]: Starting monitored process 118 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:13:45,601 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Waiting until timeout for monitored process [2022-12-14 15:13:45,649 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:13:45,649 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:13:45,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 82 conjunts are in the unsatisfiable core [2022-12-14 15:13:45,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:13:46,213 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:13:46,213 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:13:46,366 INFO L134 CoverageAnalysis]: Checked inductivity of 214 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2022-12-14 15:13:46,366 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1061349199] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:13:46,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1746114190] [2022-12-14 15:13:46,367 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:13:46,367 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:13:46,367 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:13:46,367 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:13:46,367 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:13:46,694 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:13:49,197 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '255424#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:13:49,198 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:13:49,198 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:13:49,198 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 59 [2022-12-14 15:13:49,198 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2100670071] [2022-12-14 15:13:49,198 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:13:49,198 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2022-12-14 15:13:49,198 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:13:49,198 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2022-12-14 15:13:49,198 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=4506, Unknown=0, NotChecked=0, Total=4692 [2022-12-14 15:13:49,199 INFO L87 Difference]: Start difference. First operand 1126 states and 1250 transitions. Second operand has 59 states, 59 states have (on average 1.1864406779661016) internal successors, (70), 59 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:14:03,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:14:03,173 INFO L93 Difference]: Finished difference Result 2061 states and 2203 transitions. [2022-12-14 15:14:03,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2022-12-14 15:14:03,174 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.1864406779661016) internal successors, (70), 59 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2022-12-14 15:14:03,174 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:14:03,175 INFO L225 Difference]: With dead ends: 2061 [2022-12-14 15:14:03,175 INFO L226 Difference]: Without dead ends: 2055 [2022-12-14 15:14:03,176 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 95 SyntacticMatches, 3 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2136 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=423, Invalid=10707, Unknown=0, NotChecked=0, Total=11130 [2022-12-14 15:14:03,176 INFO L413 NwaCegarLoop]: 83 mSDtfsCounter, 273 mSDsluCounter, 2687 mSDsCounter, 0 mSdLazyCounter, 6247 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 273 SdHoareTripleChecker+Valid, 2770 SdHoareTripleChecker+Invalid, 6248 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 6247 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2022-12-14 15:14:03,176 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [273 Valid, 2770 Invalid, 6248 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 6247 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2022-12-14 15:14:03,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2055 states. [2022-12-14 15:14:05,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2055 to 1132. [2022-12-14 15:14:05,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1132 states, 1131 states have (on average 1.1114058355437666) internal successors, (1257), 1131 states have internal predecessors, (1257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:14:05,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1132 states to 1132 states and 1257 transitions. [2022-12-14 15:14:05,450 INFO L78 Accepts]: Start accepts. Automaton has 1132 states and 1257 transitions. Word has length 43 [2022-12-14 15:14:05,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:14:05,450 INFO L495 AbstractCegarLoop]: Abstraction has 1132 states and 1257 transitions. [2022-12-14 15:14:05,451 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.1864406779661016) internal successors, (70), 59 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:14:05,451 INFO L276 IsEmpty]: Start isEmpty. Operand 1132 states and 1257 transitions. [2022-12-14 15:14:05,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-12-14 15:14:05,451 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:14:05,451 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:14:05,455 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (118)] Ended with exit code 0 [2022-12-14 15:14:05,652 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable120,118 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:14:05,652 INFO L420 AbstractCegarLoop]: === Iteration 122 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:14:05,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:14:05,653 INFO L85 PathProgramCache]: Analyzing trace with hash -128849411, now seen corresponding path program 115 times [2022-12-14 15:14:05,653 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:14:05,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35549158] [2022-12-14 15:14:05,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:14:05,654 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:14:05,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:14:06,374 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:14:06,374 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:14:06,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35549158] [2022-12-14 15:14:06,374 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [35549158] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:14:06,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1769177991] [2022-12-14 15:14:06,374 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:14:06,374 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:14:06,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:14:06,375 INFO L229 MonitoredProcess]: Starting monitored process 119 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:14:06,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Waiting until timeout for monitored process [2022-12-14 15:14:06,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:14:06,427 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 78 conjunts are in the unsatisfiable core [2022-12-14 15:14:06,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:14:07,181 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:14:07,181 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:14:07,431 INFO L134 CoverageAnalysis]: Checked inductivity of 168 backedges. 0 proven. 162 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-12-14 15:14:07,431 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1769177991] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:14:07,431 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1715981577] [2022-12-14 15:14:07,432 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:14:07,432 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:14:07,432 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:14:07,432 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:14:07,432 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:14:07,772 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:14:10,178 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '262127#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:14:10,178 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:14:10,178 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:14:10,178 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 57 [2022-12-14 15:14:10,178 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1177578584] [2022-12-14 15:14:10,178 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:14:10,179 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-12-14 15:14:10,179 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:14:10,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-12-14 15:14:10,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=4237, Unknown=0, NotChecked=0, Total=4422 [2022-12-14 15:14:10,179 INFO L87 Difference]: Start difference. First operand 1132 states and 1257 transitions. Second operand has 57 states, 57 states have (on average 1.2105263157894737) internal successors, (69), 57 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 15:14:22,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:14:22,120 INFO L93 Difference]: Finished difference Result 1814 states and 1938 transitions. [2022-12-14 15:14:22,120 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2022-12-14 15:14:22,120 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 1.2105263157894737) internal successors, (69), 57 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 43 [2022-12-14 15:14:22,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:14:22,122 INFO L225 Difference]: With dead ends: 1814 [2022-12-14 15:14:22,122 INFO L226 Difference]: Without dead ends: 1788 [2022-12-14 15:14:22,122 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 93 SyntacticMatches, 5 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1948 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=394, Invalid=9706, Unknown=0, NotChecked=0, Total=10100 [2022-12-14 15:14:22,122 INFO L413 NwaCegarLoop]: 72 mSDtfsCounter, 231 mSDsluCounter, 2158 mSDsCounter, 0 mSdLazyCounter, 5136 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 231 SdHoareTripleChecker+Valid, 2230 SdHoareTripleChecker+Invalid, 5137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 5136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-12-14 15:14:22,122 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [231 Valid, 2230 Invalid, 5137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 5136 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-12-14 15:14:22,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1788 states. [2022-12-14 15:14:24,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1788 to 1126. [2022-12-14 15:14:24,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1126 states, 1125 states have (on average 1.1111111111111112) internal successors, (1250), 1125 states have internal predecessors, (1250), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:14:24,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1126 states to 1126 states and 1250 transitions. [2022-12-14 15:14:24,397 INFO L78 Accepts]: Start accepts. Automaton has 1126 states and 1250 transitions. Word has length 43 [2022-12-14 15:14:24,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:14:24,397 INFO L495 AbstractCegarLoop]: Abstraction has 1126 states and 1250 transitions. [2022-12-14 15:14:24,397 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 1.2105263157894737) internal successors, (69), 57 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 15:14:24,397 INFO L276 IsEmpty]: Start isEmpty. Operand 1126 states and 1250 transitions. [2022-12-14 15:14:24,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-12-14 15:14:24,397 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:14:24,398 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:14:24,402 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (119)] Ended with exit code 0 [2022-12-14 15:14:24,598 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable121,119 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:14:24,599 INFO L420 AbstractCegarLoop]: === Iteration 123 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:14:24,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:14:24,599 INFO L85 PathProgramCache]: Analyzing trace with hash -876242793, now seen corresponding path program 116 times [2022-12-14 15:14:24,600 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:14:24,600 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138490526] [2022-12-14 15:14:24,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:14:24,600 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:14:24,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:14:25,284 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 0 proven. 122 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:14:25,284 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:14:25,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138490526] [2022-12-14 15:14:25,284 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2138490526] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:14:25,284 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [797766764] [2022-12-14 15:14:25,284 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-12-14 15:14:25,285 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:14:25,285 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:14:25,285 INFO L229 MonitoredProcess]: Starting monitored process 120 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:14:25,286 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Waiting until timeout for monitored process [2022-12-14 15:14:25,335 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2022-12-14 15:14:25,335 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:14:25,336 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 74 conjunts are in the unsatisfiable core [2022-12-14 15:14:25,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:14:25,891 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 0 proven. 122 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:14:25,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:14:26,054 INFO L134 CoverageAnalysis]: Checked inductivity of 134 backedges. 0 proven. 122 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-12-14 15:14:26,054 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [797766764] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:14:26,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1098798209] [2022-12-14 15:14:26,055 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:14:26,055 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:14:26,055 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:14:26,055 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:14:26,055 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:14:26,385 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:14:28,871 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '268328#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:14:28,871 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:14:28,871 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:14:28,871 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 55 [2022-12-14 15:14:28,871 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138957211] [2022-12-14 15:14:28,871 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:14:28,871 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2022-12-14 15:14:28,871 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:14:28,872 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2022-12-14 15:14:28,872 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=3976, Unknown=0, NotChecked=0, Total=4160 [2022-12-14 15:14:28,872 INFO L87 Difference]: Start difference. First operand 1126 states and 1250 transitions. Second operand has 55 states, 55 states have (on average 1.2181818181818183) internal successors, (67), 55 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:14:38,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:14:38,842 INFO L93 Difference]: Finished difference Result 1606 states and 1729 transitions. [2022-12-14 15:14:38,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-12-14 15:14:38,843 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.2181818181818183) internal successors, (67), 55 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2022-12-14 15:14:38,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:14:38,844 INFO L225 Difference]: With dead ends: 1606 [2022-12-14 15:14:38,844 INFO L226 Difference]: Without dead ends: 1579 [2022-12-14 15:14:38,845 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 93 SyntacticMatches, 5 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1825 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=389, Invalid=8923, Unknown=0, NotChecked=0, Total=9312 [2022-12-14 15:14:38,845 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 200 mSDsluCounter, 1737 mSDsCounter, 0 mSdLazyCounter, 4332 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 200 SdHoareTripleChecker+Valid, 1797 SdHoareTripleChecker+Invalid, 4333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 4332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2022-12-14 15:14:38,845 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [200 Valid, 1797 Invalid, 4333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 4332 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2022-12-14 15:14:38,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1579 states. [2022-12-14 15:14:41,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1579 to 1118. [2022-12-14 15:14:41,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1118 states, 1117 states have (on average 1.1110116383169204) internal successors, (1241), 1117 states have internal predecessors, (1241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:14:41,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1118 states to 1118 states and 1241 transitions. [2022-12-14 15:14:41,108 INFO L78 Accepts]: Start accepts. Automaton has 1118 states and 1241 transitions. Word has length 43 [2022-12-14 15:14:41,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:14:41,108 INFO L495 AbstractCegarLoop]: Abstraction has 1118 states and 1241 transitions. [2022-12-14 15:14:41,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.2181818181818183) internal successors, (67), 55 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:14:41,109 INFO L276 IsEmpty]: Start isEmpty. Operand 1118 states and 1241 transitions. [2022-12-14 15:14:41,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-12-14 15:14:41,109 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:14:41,109 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:14:41,113 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (120)] Ended with exit code 0 [2022-12-14 15:14:41,310 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 120 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable122 [2022-12-14 15:14:41,310 INFO L420 AbstractCegarLoop]: === Iteration 124 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:14:41,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:14:41,311 INFO L85 PathProgramCache]: Analyzing trace with hash -1321518275, now seen corresponding path program 117 times [2022-12-14 15:14:41,311 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:14:41,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [420595978] [2022-12-14 15:14:41,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:14:41,312 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:14:41,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:14:41,812 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:14:41,812 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:14:41,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [420595978] [2022-12-14 15:14:41,812 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [420595978] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:14:41,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2124712791] [2022-12-14 15:14:41,813 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-12-14 15:14:41,813 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:14:41,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:14:41,813 INFO L229 MonitoredProcess]: Starting monitored process 121 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:14:41,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Waiting until timeout for monitored process [2022-12-14 15:14:41,856 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-12-14 15:14:41,856 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-12-14 15:14:41,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 70 conjunts are in the unsatisfiable core [2022-12-14 15:14:41,859 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:14:42,386 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:14:42,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:14:42,566 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 92 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-12-14 15:14:42,566 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2124712791] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:14:42,566 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1350671752] [2022-12-14 15:14:42,567 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:14:42,567 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:14:42,567 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:14:42,567 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:14:42,567 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:14:42,895 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:14:45,032 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '274099#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:14:45,032 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:14:45,032 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:14:45,032 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 53 [2022-12-14 15:14:45,032 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [595289878] [2022-12-14 15:14:45,032 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:14:45,032 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2022-12-14 15:14:45,032 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:14:45,033 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2022-12-14 15:14:45,033 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=3723, Unknown=0, NotChecked=0, Total=3906 [2022-12-14 15:14:45,033 INFO L87 Difference]: Start difference. First operand 1118 states and 1241 transitions. Second operand has 53 states, 53 states have (on average 1.2264150943396226) internal successors, (65), 53 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:14:53,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-12-14 15:14:53,378 INFO L93 Difference]: Finished difference Result 1443 states and 1565 transitions. [2022-12-14 15:14:53,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2022-12-14 15:14:53,379 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.2264150943396226) internal successors, (65), 53 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 43 [2022-12-14 15:14:53,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-12-14 15:14:53,380 INFO L225 Difference]: With dead ends: 1443 [2022-12-14 15:14:53,380 INFO L226 Difference]: Without dead ends: 1415 [2022-12-14 15:14:53,380 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 93 SyntacticMatches, 5 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1706 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=384, Invalid=8172, Unknown=0, NotChecked=0, Total=8556 [2022-12-14 15:14:53,381 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 169 mSDsluCounter, 1398 mSDsCounter, 0 mSdLazyCounter, 3501 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 169 SdHoareTripleChecker+Valid, 1446 SdHoareTripleChecker+Invalid, 3502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2022-12-14 15:14:53,381 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [169 Valid, 1446 Invalid, 3502 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3501 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2022-12-14 15:14:53,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1415 states. [2022-12-14 15:14:55,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1415 to 1108. [2022-12-14 15:14:55,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1108 states, 1107 states have (on average 1.1111111111111112) internal successors, (1230), 1107 states have internal predecessors, (1230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:14:55,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1108 states to 1108 states and 1230 transitions. [2022-12-14 15:14:55,638 INFO L78 Accepts]: Start accepts. Automaton has 1108 states and 1230 transitions. Word has length 43 [2022-12-14 15:14:55,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-12-14 15:14:55,638 INFO L495 AbstractCegarLoop]: Abstraction has 1108 states and 1230 transitions. [2022-12-14 15:14:55,638 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.2264150943396226) internal successors, (65), 53 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2022-12-14 15:14:55,638 INFO L276 IsEmpty]: Start isEmpty. Operand 1108 states and 1230 transitions. [2022-12-14 15:14:55,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2022-12-14 15:14:55,639 INFO L187 NwaCegarLoop]: Found error trace [2022-12-14 15:14:55,639 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-12-14 15:14:55,643 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (121)] Ended with exit code 0 [2022-12-14 15:14:55,840 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 121 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable123 [2022-12-14 15:14:55,840 INFO L420 AbstractCegarLoop]: === Iteration 125 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-12-14 15:14:55,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-12-14 15:14:55,840 INFO L85 PathProgramCache]: Analyzing trace with hash 1956556631, now seen corresponding path program 118 times [2022-12-14 15:14:55,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-12-14 15:14:55,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772733431] [2022-12-14 15:14:55,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-12-14 15:14:55,840 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-12-14 15:14:55,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:14:56,404 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:14:56,404 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-12-14 15:14:56,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1772733431] [2022-12-14 15:14:56,405 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1772733431] provided 0 perfect and 1 imperfect interpolant sequences [2022-12-14 15:14:56,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087813649] [2022-12-14 15:14:56,405 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-12-14 15:14:56,405 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-12-14 15:14:56,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 [2022-12-14 15:14:56,406 INFO L229 MonitoredProcess]: Starting monitored process 122 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-12-14 15:14:56,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_91f67a75-b38f-4f3e-b0d0-0b7f33677c1b/bin/utaipan-gh47qXpMRh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (122)] Waiting until timeout for monitored process [2022-12-14 15:14:56,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-12-14 15:14:56,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 274 conjuncts, 66 conjunts are in the unsatisfiable core [2022-12-14 15:14:56,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-12-14 15:14:57,146 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:14:57,147 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-12-14 15:14:57,368 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2022-12-14 15:14:57,369 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087813649] provided 0 perfect and 2 imperfect interpolant sequences [2022-12-14 15:14:57,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1367850972] [2022-12-14 15:14:57,369 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2022-12-14 15:14:57,369 INFO L166 IcfgInterpreter]: Building call graph [2022-12-14 15:14:57,370 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-12-14 15:14:57,370 INFO L176 IcfgInterpreter]: Starting interpretation [2022-12-14 15:14:57,370 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-12-14 15:14:57,717 INFO L180 IcfgInterpreter]: Interpretation finished [2022-12-14 15:15:00,417 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '279526#(and (<= |ULTIMATE.start_main_~n~0#1| 109) (= |ULTIMATE.start_student_version_~y~1#1| |ULTIMATE.start_student_version_#res#1|) (not (< |ULTIMATE.start_student_version_~x~1#1| |ULTIMATE.start_student_version_~i~1#1|)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_~n_stones1~0#1| |ULTIMATE.start_main_~n_stones2~0#1|) 1 0)) (<= 0 |ULTIMATE.start_main_~n_stones1~0#1|) (<= 1 |ULTIMATE.start_student_version_#in~m#1|) (<= 1 |ULTIMATE.start_correct_version_~m#1|) (<= 0 |ULTIMATE.start_student_version_~i~1#1|) (<= 1 |ULTIMATE.start_student_version_~n#1|) (<= |ULTIMATE.start_main_~n_stones1~0#1| 2147483647) (<= |ULTIMATE.start_student_version_~m#1| 109) (<= 0 |ULTIMATE.start_correct_version_~y~0#1|) (<= |ULTIMATE.start_correct_version_#in~n#1| 109) (<= |ULTIMATE.start_student_version_~n#1| 109) (<= 1 |ULTIMATE.start_student_version_#in~a#1|) (<= |ULTIMATE.start_student_version_#in~a#1| 109) (<= |ULTIMATE.start_correct_version_~y~0#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~a#1|) (<= 0 |ULTIMATE.start_correct_version_~i~0#1|) (<= |ULTIMATE.start_student_version_#in~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~y~1#1|) (<= 1 |ULTIMATE.start_correct_version_~b~0#1|) (<= |ULTIMATE.start_student_version_#in~n#1| 109) (<= 1 |ULTIMATE.start_student_version_~b~1#1|) (<= 1 |ULTIMATE.start_correct_version_#in~m#1|) (<= |ULTIMATE.start_student_version_~a#1| 109) (<= 1 |ULTIMATE.start_main_~m~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_student_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_~n#1|) (<= 1 |ULTIMATE.start_student_version_~a#1|) (<= 1 |ULTIMATE.start_main_~a~0#1|) (<= 1 |ULTIMATE.start_student_version_~l~1#1|) (<= 0 |ULTIMATE.start_correct_version_#res#1|) (<= |ULTIMATE.start_correct_version_~m#1| 109) (<= 0 |ULTIMATE.start_student_version_~j~1#1|) (<= 1 |ULTIMATE.start_main_~n~0#1|) (= |ULTIMATE.start_main_~n_stones2~0#1| |ULTIMATE.start_student_version_#res#1|) (<= 1 |ULTIMATE.start_correct_version_~l~0#1|) (<= |ULTIMATE.start_correct_version_#in~a#1| 109) (<= 0 |ULTIMATE.start_correct_version_~j~0#1|) (<= |ULTIMATE.start_correct_version_~n#1| 109) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 1 |ULTIMATE.start_student_version_#in~n#1|) (<= |ULTIMATE.start_main_~m~0#1| 109) (<= |ULTIMATE.start_correct_version_~a#1| 109) (= |#NULL.offset| 0) (<= 1 |ULTIMATE.start_correct_version_#in~n#1|) (<= |ULTIMATE.start_correct_version_#in~m#1| 109) (<= 1 |ULTIMATE.start_student_version_~m#1|) (<= |ULTIMATE.start_correct_version_#res#1| 2147483647) (<= 1 |ULTIMATE.start_correct_version_#in~a#1|) (<= 0 |ULTIMATE.start_correct_version_~x~0#1|) (<= 0 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~a~0#1| 109) (= |#NULL.base| 0))' at error location [2022-12-14 15:15:00,417 WARN L310 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2022-12-14 15:15:00,417 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-12-14 15:15:00,417 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 51 [2022-12-14 15:15:00,417 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2048676030] [2022-12-14 15:15:00,417 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-12-14 15:15:00,417 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2022-12-14 15:15:00,418 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-12-14 15:15:00,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2022-12-14 15:15:00,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=182, Invalid=3478, Unknown=0, NotChecked=0, Total=3660 [2022-12-14 15:15:00,418 INFO L87 Difference]: Start difference. First operand 1108 states and 1230 transitions. Second operand has 51 states, 51 states have (on average 1.2352941176470589) internal successors, (63), 51 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)