./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 5e519f3a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI --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 eb57cc67b4a5d1052a722feccb00a81098424cf4bc0bbd7bfe756405ab740d43 --- 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-5e519f3 [2022-11-03 02:40:23,439 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-03 02:40:23,442 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-03 02:40:23,492 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-03 02:40:23,492 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-03 02:40:23,497 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-03 02:40:23,499 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-03 02:40:23,502 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-03 02:40:23,505 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-03 02:40:23,510 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-03 02:40:23,511 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-03 02:40:23,513 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-03 02:40:23,514 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-03 02:40:23,517 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-03 02:40:23,519 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-03 02:40:23,520 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-03 02:40:23,522 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-03 02:40:23,523 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-03 02:40:23,524 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-03 02:40:23,532 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-03 02:40:23,534 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-03 02:40:23,535 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-03 02:40:23,538 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-03 02:40:23,539 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-03 02:40:23,548 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-03 02:40:23,549 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-03 02:40:23,549 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-03 02:40:23,551 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-03 02:40:23,552 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-03 02:40:23,554 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-03 02:40:23,555 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-03 02:40:23,556 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-03 02:40:23,558 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-03 02:40:23,560 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-03 02:40:23,561 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-03 02:40:23,561 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-03 02:40:23,562 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-03 02:40:23,563 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-03 02:40:23,563 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-03 02:40:23,564 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-03 02:40:23,565 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-03 02:40:23,566 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-03 02:40:23,609 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-03 02:40:23,610 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-03 02:40:23,611 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-03 02:40:23,611 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-03 02:40:23,612 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-03 02:40:23,612 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-03 02:40:23,612 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-03 02:40:23,613 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-03 02:40:23,613 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-03 02:40:23,613 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-03 02:40:23,614 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-03 02:40:23,615 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-03 02:40:23,615 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-03 02:40:23,615 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-03 02:40:23,616 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-03 02:40:23,616 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-03 02:40:23,616 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-03 02:40:23,616 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-03 02:40:23,617 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-03 02:40:23,617 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-03 02:40:23,618 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-03 02:40:23,618 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-03 02:40:23,618 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-03 02:40:23,620 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-03 02:40:23,620 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-03 02:40:23,620 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-03 02:40:23,621 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-03 02:40:23,621 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-03 02:40:23,621 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-03 02:40:23,622 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-03 02:40:23,622 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-03 02:40:23,623 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-03 02:40:23,623 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:40:23,623 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-03 02:40:23,623 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-03 02:40:23,624 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-03 02:40:23,624 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-03 02:40:23,624 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-03 02:40:23,624 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-03 02:40:23,625 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-03 02:40:23,625 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-03 02:40:23,625 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_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> eb57cc67b4a5d1052a722feccb00a81098424cf4bc0bbd7bfe756405ab740d43 [2022-11-03 02:40:23,945 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-03 02:40:23,981 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-03 02:40:23,985 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-03 02:40:23,986 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-03 02:40:23,991 INFO L275 PluginConnector]: CDTParser initialized [2022-11-03 02:40:23,992 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/../../sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c [2022-11-03 02:40:24,066 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/data/9d78c579a/37841954d51241c4a370a49df5339b2d/FLAG8883ed9f4 [2022-11-03 02:40:24,609 INFO L306 CDTParser]: Found 1 translation units. [2022-11-03 02:40:24,610 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c [2022-11-03 02:40:24,620 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/data/9d78c579a/37841954d51241c4a370a49df5339b2d/FLAG8883ed9f4 [2022-11-03 02:40:24,945 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/data/9d78c579a/37841954d51241c4a370a49df5339b2d [2022-11-03 02:40:24,950 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-03 02:40:24,952 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-03 02:40:24,957 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-03 02:40:24,957 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-03 02:40:24,960 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-03 02:40:24,961 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:40:24" (1/1) ... [2022-11-03 02:40:24,963 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3f31c067 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:40:24, skipping insertion in model container [2022-11-03 02:40:24,964 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.11 02:40:24" (1/1) ... [2022-11-03 02:40:24,971 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-03 02:40:24,987 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-03 02:40:25,205 WARN L230 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_571535e1-4e19-467b-9e9f-54897bb71843/sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c[946,959] [2022-11-03 02:40:25,208 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:40:25,217 INFO L203 MainTranslator]: Completed pre-run [2022-11-03 02:40:25,237 WARN L230 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_571535e1-4e19-467b-9e9f-54897bb71843/sv-benchmarks/c/recursive-simple/fibo_2calls_5-2.c[946,959] [2022-11-03 02:40:25,238 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-03 02:40:25,254 INFO L208 MainTranslator]: Completed translation [2022-11-03 02:40:25,254 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:40:25 WrapperNode [2022-11-03 02:40:25,255 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-03 02:40:25,256 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-03 02:40:25,257 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-03 02:40:25,257 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-03 02:40:25,265 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:40:25" (1/1) ... [2022-11-03 02:40:25,273 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:40:25" (1/1) ... [2022-11-03 02:40:25,287 INFO L138 Inliner]: procedures = 14, calls = 12, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 21 [2022-11-03 02:40:25,287 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-03 02:40:25,288 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-03 02:40:25,288 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-03 02:40:25,288 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-03 02:40:25,297 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:40:25" (1/1) ... [2022-11-03 02:40:25,297 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:40:25" (1/1) ... [2022-11-03 02:40:25,298 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:40:25" (1/1) ... [2022-11-03 02:40:25,298 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:40:25" (1/1) ... [2022-11-03 02:40:25,301 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:40:25" (1/1) ... [2022-11-03 02:40:25,303 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:40:25" (1/1) ... [2022-11-03 02:40:25,304 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:40:25" (1/1) ... [2022-11-03 02:40:25,305 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:40:25" (1/1) ... [2022-11-03 02:40:25,310 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-03 02:40:25,311 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-03 02:40:25,311 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-03 02:40:25,312 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-03 02:40:25,314 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:40:25" (1/1) ... [2022-11-03 02:40:25,320 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-03 02:40:25,333 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:40:25,349 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-03 02:40:25,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-03 02:40:25,387 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-03 02:40:25,387 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-03 02:40:25,387 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2022-11-03 02:40:25,388 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2022-11-03 02:40:25,388 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2022-11-03 02:40:25,388 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2022-11-03 02:40:25,388 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-03 02:40:25,388 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-03 02:40:25,457 INFO L235 CfgBuilder]: Building ICFG [2022-11-03 02:40:25,459 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-03 02:40:25,655 INFO L276 CfgBuilder]: Performing block encoding [2022-11-03 02:40:25,681 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-03 02:40:25,681 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-11-03 02:40:25,684 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:40:25 BoogieIcfgContainer [2022-11-03 02:40:25,684 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-03 02:40:25,693 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-03 02:40:25,694 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-03 02:40:25,698 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-03 02:40:25,698 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.11 02:40:24" (1/3) ... [2022-11-03 02:40:25,699 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d7beae7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:40:25, skipping insertion in model container [2022-11-03 02:40:25,699 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.11 02:40:25" (2/3) ... [2022-11-03 02:40:25,700 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d7beae7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.11 02:40:25, skipping insertion in model container [2022-11-03 02:40:25,700 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:40:25" (3/3) ... [2022-11-03 02:40:25,702 INFO L112 eAbstractionObserver]: Analyzing ICFG fibo_2calls_5-2.c [2022-11-03 02:40:25,721 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-03 02:40:25,721 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-03 02:40:25,796 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-03 02:40:25,806 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;@26929a26, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-03 02:40:25,806 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-03 02:40:25,811 INFO L276 IsEmpty]: Start isEmpty. Operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2022-11-03 02:40:25,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2022-11-03 02:40:25,829 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:40:25,829 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:40:25,830 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:40:25,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:40:25,837 INFO L85 PathProgramCache]: Analyzing trace with hash 2097990987, now seen corresponding path program 1 times [2022-11-03 02:40:25,847 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:40:25,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2097085903] [2022-11-03 02:40:25,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:40:25,849 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:40:25,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:40:26,158 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:40:26,159 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:40:26,160 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2097085903] [2022-11-03 02:40:26,160 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2097085903] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:40:26,161 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:40:26,161 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 02:40:26,179 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853853024] [2022-11-03 02:40:26,180 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:40:26,184 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:40:26,185 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:40:26,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:40:26,248 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:40:26,250 INFO L87 Difference]: Start difference. First operand has 26 states, 17 states have (on average 1.3529411764705883) internal successors, (23), 18 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-03 02:40:26,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:40:26,322 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2022-11-03 02:40:26,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:40:26,325 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2022-11-03 02:40:26,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:40:26,334 INFO L225 Difference]: With dead ends: 36 [2022-11-03 02:40:26,335 INFO L226 Difference]: Without dead ends: 26 [2022-11-03 02:40:26,338 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:40:26,342 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 2 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 105 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 [2022-11-03 02:40:26,343 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 105 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:40:26,362 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2022-11-03 02:40:26,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2022-11-03 02:40:26,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-03 02:40:26,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2022-11-03 02:40:26,388 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 9 [2022-11-03 02:40:26,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:40:26,388 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2022-11-03 02:40:26,388 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-03 02:40:26,389 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2022-11-03 02:40:26,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2022-11-03 02:40:26,390 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:40:26,390 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:40:26,391 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-03 02:40:26,391 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:40:26,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:40:26,392 INFO L85 PathProgramCache]: Analyzing trace with hash 1328370967, now seen corresponding path program 1 times [2022-11-03 02:40:26,392 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:40:26,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1277158874] [2022-11-03 02:40:26,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:40:26,393 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:40:26,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:40:26,462 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2022-11-03 02:40:26,462 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:40:26,462 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1277158874] [2022-11-03 02:40:26,463 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1277158874] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:40:26,463 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-03 02:40:26,463 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-03 02:40:26,463 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568190361] [2022-11-03 02:40:26,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:40:26,465 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-03 02:40:26,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:40:26,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-03 02:40:26,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:40:26,466 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-03 02:40:26,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:40:26,502 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2022-11-03 02:40:26,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-03 02:40:26,504 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2022-11-03 02:40:26,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:40:26,508 INFO L225 Difference]: With dead ends: 32 [2022-11-03 02:40:26,508 INFO L226 Difference]: Without dead ends: 28 [2022-11-03 02:40:26,508 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-03 02:40:26,510 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-03 02:40:26,511 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 116 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-03 02:40:26,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2022-11-03 02:40:26,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2022-11-03 02:40:26,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 5 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2022-11-03 02:40:26,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2022-11-03 02:40:26,519 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 10 [2022-11-03 02:40:26,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:40:26,520 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2022-11-03 02:40:26,520 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2022-11-03 02:40:26,520 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2022-11-03 02:40:26,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2022-11-03 02:40:26,522 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:40:26,522 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:40:26,522 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-03 02:40:26,523 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:40:26,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:40:26,523 INFO L85 PathProgramCache]: Analyzing trace with hash -1296553538, now seen corresponding path program 1 times [2022-11-03 02:40:26,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:40:26,524 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532158139] [2022-11-03 02:40:26,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:40:26,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:40:26,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:40:26,718 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:40:26,718 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:40:26,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532158139] [2022-11-03 02:40:26,719 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1532158139] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:40:26,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1651574138] [2022-11-03 02:40:26,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:40:26,719 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:40:26,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:40:26,725 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:40:26,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-03 02:40:26,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:40:26,812 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-03 02:40:26,817 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:40:26,933 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:40:26,933 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:40:27,251 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2022-11-03 02:40:27,251 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1651574138] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:40:27,252 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [876489378] [2022-11-03 02:40:27,273 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-03 02:40:27,274 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:40:27,278 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2022-11-03 02:40:27,284 INFO L176 IcfgInterpreter]: Starting interpretation [2022-11-03 02:40:27,285 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2022-11-03 02:40:27,491 INFO L197 IcfgInterpreter]: Interpreting procedure fibo1 with input of size 39 for LOIs [2022-11-03 02:40:27,593 INFO L197 IcfgInterpreter]: Interpreting procedure fibo2 with input of size 39 for LOIs [2022-11-03 02:40:27,610 INFO L180 IcfgInterpreter]: Interpretation finished [2022-11-03 02:40:27,973 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSifa [876489378] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-03 02:40:27,973 INFO L184 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:40:27,973 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [6, 7, 7] total 17 [2022-11-03 02:40:27,974 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913186377] [2022-11-03 02:40:27,974 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-03 02:40:27,975 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-03 02:40:27,975 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:40:27,975 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-03 02:40:27,976 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2022-11-03 02:40:27,976 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 02:40:28,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:40:28,106 INFO L93 Difference]: Finished difference Result 68 states and 91 transitions. [2022-11-03 02:40:28,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-03 02:40:28,107 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) Word has length 22 [2022-11-03 02:40:28,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:40:28,114 INFO L225 Difference]: With dead ends: 68 [2022-11-03 02:40:28,114 INFO L226 Difference]: Without dead ends: 44 [2022-11-03 02:40:28,116 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 52 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=48, Invalid=224, Unknown=0, NotChecked=0, Total=272 [2022-11-03 02:40:28,120 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 18 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:40:28,122 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 110 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:40:28,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2022-11-03 02:40:28,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2022-11-03 02:40:28,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.1428571428571428) internal successors, (32), 28 states have internal predecessors, (32), 9 states have call successors, (9), 4 states have call predecessors, (9), 4 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2022-11-03 02:40:28,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2022-11-03 02:40:28,149 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 22 [2022-11-03 02:40:28,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:40:28,149 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2022-11-03 02:40:28,150 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 2.1666666666666665) internal successors, (13), 4 states have internal predecessors, (13), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2022-11-03 02:40:28,150 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2022-11-03 02:40:28,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2022-11-03 02:40:28,153 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:40:28,154 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:40:28,187 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2022-11-03 02:40:28,366 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:40:28,367 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:40:28,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:40:28,367 INFO L85 PathProgramCache]: Analyzing trace with hash -28918515, now seen corresponding path program 1 times [2022-11-03 02:40:28,368 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:40:28,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1033432895] [2022-11-03 02:40:28,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:40:28,369 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:40:28,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:40:28,550 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 02:40:28,551 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:40:28,552 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1033432895] [2022-11-03 02:40:28,552 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1033432895] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:40:28,554 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2035654482] [2022-11-03 02:40:28,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:40:28,556 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:40:28,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:40:28,560 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:40:28,578 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-03 02:40:28,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:40:28,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-03 02:40:28,623 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:40:28,709 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-03 02:40:28,709 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:40:29,063 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:40:29,064 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2035654482] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:40:29,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1402035318] [2022-11-03 02:40:29,066 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-03 02:40:29,067 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:40:29,068 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-03 02:40:29,070 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:40:29,071 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 9] total 14 [2022-11-03 02:40:29,071 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1285488766] [2022-11-03 02:40:29,071 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:40:29,072 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2022-11-03 02:40:29,072 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:40:29,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2022-11-03 02:40:29,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2022-11-03 02:40:29,073 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-03 02:40:29,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:40:29,310 INFO L93 Difference]: Finished difference Result 85 states and 121 transitions. [2022-11-03 02:40:29,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 02:40:29,311 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) Word has length 35 [2022-11-03 02:40:29,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:40:29,312 INFO L225 Difference]: With dead ends: 85 [2022-11-03 02:40:29,313 INFO L226 Difference]: Without dead ends: 53 [2022-11-03 02:40:29,314 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2022-11-03 02:40:29,315 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 39 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 214 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:40:29,315 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 94 Invalid, 214 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:40:29,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2022-11-03 02:40:29,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 44. [2022-11-03 02:40:29,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 29 states have (on average 1.1379310344827587) internal successors, (33), 30 states have internal predecessors, (33), 9 states have call successors, (9), 4 states have call predecessors, (9), 5 states have return successors, (11), 9 states have call predecessors, (11), 9 states have call successors, (11) [2022-11-03 02:40:29,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 53 transitions. [2022-11-03 02:40:29,327 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 53 transitions. Word has length 35 [2022-11-03 02:40:29,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:40:29,328 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 53 transitions. [2022-11-03 02:40:29,328 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 11 states have (on average 4.0) internal successors, (44), 14 states have internal predecessors, (44), 11 states have call successors, (13), 1 states have call predecessors, (13), 5 states have return successors, (13), 3 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-03 02:40:29,328 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 53 transitions. [2022-11-03 02:40:29,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2022-11-03 02:40:29,330 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:40:29,330 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:40:29,366 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-03 02:40:29,547 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:40:29,547 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:40:29,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:40:29,548 INFO L85 PathProgramCache]: Analyzing trace with hash -243412115, now seen corresponding path program 1 times [2022-11-03 02:40:29,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:40:29,548 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135196094] [2022-11-03 02:40:29,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:40:29,549 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:40:29,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:40:29,757 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-03 02:40:29,758 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:40:29,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135196094] [2022-11-03 02:40:29,758 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135196094] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:40:29,758 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [52109818] [2022-11-03 02:40:29,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:40:29,759 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:40:29,759 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:40:29,760 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:40:29,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-03 02:40:29,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:40:29,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-03 02:40:29,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:40:29,959 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-03 02:40:29,959 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:40:30,365 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2022-11-03 02:40:30,365 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [52109818] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:40:30,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [130797326] [2022-11-03 02:40:30,368 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-03 02:40:30,368 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:40:30,369 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-03 02:40:30,373 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:40:30,373 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 18 [2022-11-03 02:40:30,374 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759809450] [2022-11-03 02:40:30,374 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:40:30,375 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-03 02:40:30,376 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:40:30,377 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-03 02:40:30,377 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2022-11-03 02:40:30,377 INFO L87 Difference]: Start difference. First operand 44 states and 53 transitions. Second operand has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-03 02:40:31,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:40:31,063 INFO L93 Difference]: Finished difference Result 121 states and 203 transitions. [2022-11-03 02:40:31,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2022-11-03 02:40:31,064 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) Word has length 36 [2022-11-03 02:40:31,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:40:31,066 INFO L225 Difference]: With dead ends: 121 [2022-11-03 02:40:31,066 INFO L226 Difference]: Without dead ends: 77 [2022-11-03 02:40:31,068 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 68 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=142, Invalid=670, Unknown=0, NotChecked=0, Total=812 [2022-11-03 02:40:31,069 INFO L413 NwaCegarLoop]: 28 mSDtfsCounter, 72 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 484 mSolverCounterSat, 93 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 76 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 577 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 93 IncrementalHoareTripleChecker+Valid, 484 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2022-11-03 02:40:31,069 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [76 Valid, 198 Invalid, 577 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [93 Valid, 484 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2022-11-03 02:40:31,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-11-03 02:40:31,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 63. [2022-11-03 02:40:31,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 40 states have (on average 1.15) internal successors, (46), 43 states have internal predecessors, (46), 14 states have call successors, (14), 5 states have call predecessors, (14), 8 states have return successors, (31), 14 states have call predecessors, (31), 14 states have call successors, (31) [2022-11-03 02:40:31,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 91 transitions. [2022-11-03 02:40:31,088 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 91 transitions. Word has length 36 [2022-11-03 02:40:31,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:40:31,088 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 91 transitions. [2022-11-03 02:40:31,088 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 16 states have (on average 3.0625) internal successors, (49), 18 states have internal predecessors, (49), 11 states have call successors, (13), 1 states have call predecessors, (13), 7 states have return successors, (13), 6 states have call predecessors, (13), 11 states have call successors, (13) [2022-11-03 02:40:31,089 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 91 transitions. [2022-11-03 02:40:31,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2022-11-03 02:40:31,091 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:40:31,091 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:40:31,132 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2022-11-03 02:40:31,310 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:40:31,311 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:40:31,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:40:31,311 INFO L85 PathProgramCache]: Analyzing trace with hash 403750738, now seen corresponding path program 1 times [2022-11-03 02:40:31,311 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:40:31,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2061885952] [2022-11-03 02:40:31,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:40:31,311 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:40:31,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:40:31,517 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2022-11-03 02:40:31,517 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:40:31,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2061885952] [2022-11-03 02:40:31,518 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2061885952] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:40:31,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1860644557] [2022-11-03 02:40:31,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:40:31,518 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:40:31,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:40:31,519 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:40:31,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-03 02:40:31,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:40:31,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 10 conjunts are in the unsatisfiable core [2022-11-03 02:40:31,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:40:31,702 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2022-11-03 02:40:31,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:40:32,331 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2022-11-03 02:40:32,331 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1860644557] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:40:32,332 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2069038642] [2022-11-03 02:40:32,336 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-03 02:40:32,336 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:40:32,337 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-03 02:40:32,338 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:40:32,338 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 11] total 16 [2022-11-03 02:40:32,339 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [776237032] [2022-11-03 02:40:32,339 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:40:32,340 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2022-11-03 02:40:32,341 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:40:32,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2022-11-03 02:40:32,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=188, Unknown=0, NotChecked=0, Total=240 [2022-11-03 02:40:32,342 INFO L87 Difference]: Start difference. First operand 63 states and 91 transitions. Second operand has 16 states, 15 states have (on average 3.533333333333333) internal successors, (53), 16 states have internal predecessors, (53), 11 states have call successors, (13), 1 states have call predecessors, (13), 8 states have return successors, (17), 8 states have call predecessors, (17), 11 states have call successors, (17) [2022-11-03 02:40:32,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:40:32,624 INFO L93 Difference]: Finished difference Result 119 states and 203 transitions. [2022-11-03 02:40:32,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-03 02:40:32,625 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 3.533333333333333) internal successors, (53), 16 states have internal predecessors, (53), 11 states have call successors, (13), 1 states have call predecessors, (13), 8 states have return successors, (17), 8 states have call predecessors, (17), 11 states have call successors, (17) Word has length 50 [2022-11-03 02:40:32,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:40:32,635 INFO L225 Difference]: With dead ends: 119 [2022-11-03 02:40:32,636 INFO L226 Difference]: Without dead ends: 97 [2022-11-03 02:40:32,638 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 91 SyntacticMatches, 5 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=394, Unknown=0, NotChecked=0, Total=506 [2022-11-03 02:40:32,641 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 53 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 261 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2022-11-03 02:40:32,642 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 101 Invalid, 261 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 196 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2022-11-03 02:40:32,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2022-11-03 02:40:32,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 72. [2022-11-03 02:40:32,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 72 states, 46 states have (on average 1.1304347826086956) internal successors, (52), 49 states have internal predecessors, (52), 14 states have call successors, (14), 5 states have call predecessors, (14), 11 states have return successors, (39), 17 states have call predecessors, (39), 14 states have call successors, (39) [2022-11-03 02:40:32,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 105 transitions. [2022-11-03 02:40:32,681 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 105 transitions. Word has length 50 [2022-11-03 02:40:32,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:40:32,683 INFO L495 AbstractCegarLoop]: Abstraction has 72 states and 105 transitions. [2022-11-03 02:40:32,685 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 15 states have (on average 3.533333333333333) internal successors, (53), 16 states have internal predecessors, (53), 11 states have call successors, (13), 1 states have call predecessors, (13), 8 states have return successors, (17), 8 states have call predecessors, (17), 11 states have call successors, (17) [2022-11-03 02:40:32,686 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 105 transitions. [2022-11-03 02:40:32,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2022-11-03 02:40:32,694 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:40:32,695 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:40:32,737 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-03 02:40:32,895 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:40:32,895 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:40:32,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:40:32,896 INFO L85 PathProgramCache]: Analyzing trace with hash 1766289300, now seen corresponding path program 1 times [2022-11-03 02:40:32,896 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:40:32,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658319548] [2022-11-03 02:40:32,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:40:32,896 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:40:32,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:40:33,049 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 31 proven. 33 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2022-11-03 02:40:33,049 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:40:33,049 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658319548] [2022-11-03 02:40:33,049 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1658319548] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:40:33,050 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1051820654] [2022-11-03 02:40:33,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:40:33,050 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:40:33,050 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:40:33,051 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:40:33,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-03 02:40:33,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:40:33,141 INFO L263 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 8 conjunts are in the unsatisfiable core [2022-11-03 02:40:33,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:40:33,200 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 31 proven. 33 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2022-11-03 02:40:33,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:40:33,614 INFO L134 CoverageAnalysis]: Checked inductivity of 145 backedges. 31 proven. 35 refuted. 0 times theorem prover too weak. 79 trivial. 0 not checked. [2022-11-03 02:40:33,614 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1051820654] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:40:33,615 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [468381808] [2022-11-03 02:40:33,619 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-03 02:40:33,619 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:40:33,620 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-03 02:40:33,620 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:40:33,621 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 9] total 11 [2022-11-03 02:40:33,621 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522096231] [2022-11-03 02:40:33,622 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:40:33,624 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2022-11-03 02:40:33,624 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:40:33,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2022-11-03 02:40:33,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2022-11-03 02:40:33,625 INFO L87 Difference]: Start difference. First operand 72 states and 105 transitions. Second operand has 11 states, 10 states have (on average 4.3) internal successors, (43), 11 states have internal predecessors, (43), 7 states have call successors, (12), 1 states have call predecessors, (12), 4 states have return successors, (12), 6 states have call predecessors, (12), 7 states have call successors, (12) [2022-11-03 02:40:33,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:40:33,769 INFO L93 Difference]: Finished difference Result 101 states and 160 transitions. [2022-11-03 02:40:33,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-03 02:40:33,770 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 4.3) internal successors, (43), 11 states have internal predecessors, (43), 7 states have call successors, (12), 1 states have call predecessors, (12), 4 states have return successors, (12), 6 states have call predecessors, (12), 7 states have call successors, (12) Word has length 79 [2022-11-03 02:40:33,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:40:33,772 INFO L225 Difference]: With dead ends: 101 [2022-11-03 02:40:33,772 INFO L226 Difference]: Without dead ends: 89 [2022-11-03 02:40:33,773 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 153 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2022-11-03 02:40:33,775 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 41 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 151 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:40:33,776 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 68 Invalid, 151 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:40:33,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2022-11-03 02:40:33,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 74. [2022-11-03 02:40:33,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 47 states have (on average 1.127659574468085) internal successors, (53), 51 states have internal predecessors, (53), 14 states have call successors, (14), 5 states have call predecessors, (14), 12 states have return successors, (42), 17 states have call predecessors, (42), 14 states have call successors, (42) [2022-11-03 02:40:33,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 109 transitions. [2022-11-03 02:40:33,814 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 109 transitions. Word has length 79 [2022-11-03 02:40:33,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:40:33,815 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 109 transitions. [2022-11-03 02:40:33,815 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 4.3) internal successors, (43), 11 states have internal predecessors, (43), 7 states have call successors, (12), 1 states have call predecessors, (12), 4 states have return successors, (12), 6 states have call predecessors, (12), 7 states have call successors, (12) [2022-11-03 02:40:33,815 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 109 transitions. [2022-11-03 02:40:33,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2022-11-03 02:40:33,822 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:40:33,823 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 7, 7, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:40:33,862 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-03 02:40:34,042 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2022-11-03 02:40:34,043 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:40:34,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:40:34,043 INFO L85 PathProgramCache]: Analyzing trace with hash 1644440509, now seen corresponding path program 1 times [2022-11-03 02:40:34,044 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:40:34,044 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828630512] [2022-11-03 02:40:34,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:40:34,044 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:40:34,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:40:34,384 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 69 proven. 74 refuted. 0 times theorem prover too weak. 203 trivial. 0 not checked. [2022-11-03 02:40:34,385 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:40:34,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [828630512] [2022-11-03 02:40:34,385 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [828630512] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:40:34,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1172072417] [2022-11-03 02:40:34,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:40:34,387 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:40:34,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:40:34,391 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:40:34,395 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-03 02:40:34,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:40:34,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 12 conjunts are in the unsatisfiable core [2022-11-03 02:40:34,478 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:40:34,575 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 77 proven. 83 refuted. 0 times theorem prover too weak. 186 trivial. 0 not checked. [2022-11-03 02:40:34,576 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:40:35,549 INFO L134 CoverageAnalysis]: Checked inductivity of 346 backedges. 77 proven. 91 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2022-11-03 02:40:35,549 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1172072417] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:40:35,549 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [550358905] [2022-11-03 02:40:35,552 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-03 02:40:35,553 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:40:35,553 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-03 02:40:35,554 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:40:35,555 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 13] total 18 [2022-11-03 02:40:35,555 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376690895] [2022-11-03 02:40:35,555 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:40:35,556 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2022-11-03 02:40:35,556 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:40:35,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2022-11-03 02:40:35,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=243, Unknown=0, NotChecked=0, Total=306 [2022-11-03 02:40:35,557 INFO L87 Difference]: Start difference. First operand 74 states and 109 transitions. Second operand has 18 states, 17 states have (on average 3.5294117647058822) internal successors, (60), 18 states have internal predecessors, (60), 12 states have call successors, (18), 1 states have call predecessors, (18), 6 states have return successors, (20), 9 states have call predecessors, (20), 12 states have call successors, (20) [2022-11-03 02:40:35,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:40:35,895 INFO L93 Difference]: Finished difference Result 124 states and 219 transitions. [2022-11-03 02:40:35,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2022-11-03 02:40:35,896 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 3.5294117647058822) internal successors, (60), 18 states have internal predecessors, (60), 12 states have call successors, (18), 1 states have call predecessors, (18), 6 states have return successors, (20), 9 states have call predecessors, (20), 12 states have call successors, (20) Word has length 119 [2022-11-03 02:40:35,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:40:35,897 INFO L225 Difference]: With dead ends: 124 [2022-11-03 02:40:35,898 INFO L226 Difference]: Without dead ends: 77 [2022-11-03 02:40:35,899 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 227 SyntacticMatches, 6 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 128 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2022-11-03 02:40:35,899 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 45 mSDsluCounter, 156 mSDsCounter, 0 mSdLazyCounter, 338 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 369 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 338 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-03 02:40:35,900 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 177 Invalid, 369 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 338 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-03 02:40:35,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2022-11-03 02:40:35,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2022-11-03 02:40:35,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 50 states have (on average 1.12) internal successors, (56), 53 states have internal predecessors, (56), 13 states have call successors, (13), 6 states have call predecessors, (13), 13 states have return successors, (36), 17 states have call predecessors, (36), 13 states have call successors, (36) [2022-11-03 02:40:35,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 105 transitions. [2022-11-03 02:40:35,918 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 105 transitions. Word has length 119 [2022-11-03 02:40:35,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:40:35,921 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 105 transitions. [2022-11-03 02:40:35,922 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 3.5294117647058822) internal successors, (60), 18 states have internal predecessors, (60), 12 states have call successors, (18), 1 states have call predecessors, (18), 6 states have return successors, (20), 9 states have call predecessors, (20), 12 states have call successors, (20) [2022-11-03 02:40:35,922 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 105 transitions. [2022-11-03 02:40:35,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2022-11-03 02:40:35,929 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:40:35,929 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:40:35,974 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-03 02:40:36,150 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:40:36,151 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:40:36,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:40:36,151 INFO L85 PathProgramCache]: Analyzing trace with hash 1315224845, now seen corresponding path program 2 times [2022-11-03 02:40:36,151 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:40:36,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1929495095] [2022-11-03 02:40:36,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:40:36,152 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:40:36,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-03 02:40:36,270 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 43 proven. 15 refuted. 0 times theorem prover too weak. 131 trivial. 0 not checked. [2022-11-03 02:40:36,270 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-03 02:40:36,270 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1929495095] [2022-11-03 02:40:36,270 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1929495095] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-03 02:40:36,271 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1208890595] [2022-11-03 02:40:36,271 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-03 02:40:36,271 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:40:36,271 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 [2022-11-03 02:40:36,272 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-03 02:40:36,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-03 02:40:36,341 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2022-11-03 02:40:36,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-03 02:40:36,342 INFO L263 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-03 02:40:36,344 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-03 02:40:36,406 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 64 proven. 4 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2022-11-03 02:40:36,407 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-03 02:40:36,705 INFO L134 CoverageAnalysis]: Checked inductivity of 189 backedges. 64 proven. 4 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2022-11-03 02:40:36,706 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1208890595] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-03 02:40:36,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1163076264] [2022-11-03 02:40:36,708 INFO L159 IcfgInterpreter]: Started Sifa with 24 locations of interest [2022-11-03 02:40:36,708 INFO L166 IcfgInterpreter]: Building call graph [2022-11-03 02:40:36,709 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-03 02:40:36,709 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-03 02:40:36,709 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 13 [2022-11-03 02:40:36,709 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974934667] [2022-11-03 02:40:36,709 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-03 02:40:36,710 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2022-11-03 02:40:36,710 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-03 02:40:36,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2022-11-03 02:40:36,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2022-11-03 02:40:36,711 INFO L87 Difference]: Start difference. First operand 77 states and 105 transitions. Second operand has 13 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 13 states have internal predecessors, (44), 4 states have call successors, (8), 1 states have call predecessors, (8), 5 states have return successors, (12), 3 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-03 02:40:36,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-03 02:40:36,926 INFO L93 Difference]: Finished difference Result 138 states and 201 transitions. [2022-11-03 02:40:36,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2022-11-03 02:40:36,927 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 13 states have internal predecessors, (44), 4 states have call successors, (8), 1 states have call predecessors, (8), 5 states have return successors, (12), 3 states have call predecessors, (12), 4 states have call successors, (12) Word has length 91 [2022-11-03 02:40:36,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-03 02:40:36,928 INFO L225 Difference]: With dead ends: 138 [2022-11-03 02:40:36,928 INFO L226 Difference]: Without dead ends: 70 [2022-11-03 02:40:36,928 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 173 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=85, Invalid=295, Unknown=0, NotChecked=0, Total=380 [2022-11-03 02:40:36,929 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 64 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-03 02:40:36,929 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [68 Valid, 78 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-03 02:40:36,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2022-11-03 02:40:36,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 67. [2022-11-03 02:40:36,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 46 states have internal predecessors, (48), 11 states have call successors, (11), 6 states have call predecessors, (11), 11 states have return successors, (23), 14 states have call predecessors, (23), 11 states have call successors, (23) [2022-11-03 02:40:36,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 82 transitions. [2022-11-03 02:40:36,938 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 82 transitions. Word has length 91 [2022-11-03 02:40:36,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-03 02:40:36,939 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 82 transitions. [2022-11-03 02:40:36,939 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 13 states have internal predecessors, (44), 4 states have call successors, (8), 1 states have call predecessors, (8), 5 states have return successors, (12), 3 states have call predecessors, (12), 4 states have call successors, (12) [2022-11-03 02:40:36,939 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 82 transitions. [2022-11-03 02:40:36,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2022-11-03 02:40:36,940 INFO L187 NwaCegarLoop]: Found error trace [2022-11-03 02:40:36,940 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:40:36,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-03 02:40:37,162 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-03 02:40:37,162 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-03 02:40:37,163 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-03 02:40:37,163 INFO L85 PathProgramCache]: Analyzing trace with hash 1839997110, now seen corresponding path program 3 times [2022-11-03 02:40:37,163 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-03 02:40:37,163 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [152310379] [2022-11-03 02:40:37,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-03 02:40:37,163 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-03 02:40:37,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-11-03 02:40:37,194 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2022-11-03 02:40:37,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2022-11-03 02:40:37,243 INFO L130 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2022-11-03 02:40:37,244 INFO L359 BasicCegarLoop]: Counterexample is feasible [2022-11-03 02:40:37,245 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2022-11-03 02:40:37,247 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2022-11-03 02:40:37,251 INFO L444 BasicCegarLoop]: Path program histogram: [3, 1, 1, 1, 1, 1, 1, 1] [2022-11-03 02:40:37,256 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2022-11-03 02:40:37,338 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.11 02:40:37 BoogieIcfgContainer [2022-11-03 02:40:37,338 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2022-11-03 02:40:37,339 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2022-11-03 02:40:37,339 INFO L271 PluginConnector]: Initializing Witness Printer... [2022-11-03 02:40:37,339 INFO L275 PluginConnector]: Witness Printer initialized [2022-11-03 02:40:37,340 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.11 02:40:25" (3/4) ... [2022-11-03 02:40:37,344 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2022-11-03 02:40:37,426 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/witness.graphml [2022-11-03 02:40:37,426 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2022-11-03 02:40:37,427 INFO L158 Benchmark]: Toolchain (without parser) took 12474.66ms. Allocated memory was 98.6MB in the beginning and 151.0MB in the end (delta: 52.4MB). Free memory was 66.2MB in the beginning and 75.9MB in the end (delta: -9.7MB). Peak memory consumption was 42.2MB. Max. memory is 16.1GB. [2022-11-03 02:40:37,427 INFO L158 Benchmark]: CDTParser took 0.28ms. Allocated memory is still 98.6MB. Free memory is still 54.7MB. There was no memory consumed. Max. memory is 16.1GB. [2022-11-03 02:40:37,428 INFO L158 Benchmark]: CACSL2BoogieTranslator took 298.25ms. Allocated memory is still 98.6MB. Free memory was 66.0MB in the beginning and 72.3MB in the end (delta: -6.3MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2022-11-03 02:40:37,428 INFO L158 Benchmark]: Boogie Procedure Inliner took 31.06ms. Allocated memory is still 98.6MB. Free memory was 72.3MB in the beginning and 70.9MB in the end (delta: 1.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2022-11-03 02:40:37,428 INFO L158 Benchmark]: Boogie Preprocessor took 22.80ms. Allocated memory is still 98.6MB. Free memory was 70.9MB in the beginning and 69.9MB in the end (delta: 1.0MB). There was no memory consumed. Max. memory is 16.1GB. [2022-11-03 02:40:37,429 INFO L158 Benchmark]: RCFGBuilder took 373.01ms. Allocated memory is still 98.6MB. Free memory was 69.9MB in the beginning and 59.7MB in the end (delta: 10.2MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2022-11-03 02:40:37,429 INFO L158 Benchmark]: TraceAbstraction took 11644.72ms. Allocated memory was 98.6MB in the beginning and 151.0MB in the end (delta: 52.4MB). Free memory was 59.0MB in the beginning and 79.0MB in the end (delta: -20.1MB). Peak memory consumption was 32.7MB. Max. memory is 16.1GB. [2022-11-03 02:40:37,430 INFO L158 Benchmark]: Witness Printer took 87.60ms. Allocated memory is still 151.0MB. Free memory was 79.0MB in the beginning and 75.9MB in the end (delta: 3.1MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2022-11-03 02:40:37,432 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28ms. Allocated memory is still 98.6MB. Free memory is still 54.7MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 298.25ms. Allocated memory is still 98.6MB. Free memory was 66.0MB in the beginning and 72.3MB in the end (delta: -6.3MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 31.06ms. Allocated memory is still 98.6MB. Free memory was 72.3MB in the beginning and 70.9MB in the end (delta: 1.4MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 22.80ms. Allocated memory is still 98.6MB. Free memory was 70.9MB in the beginning and 69.9MB in the end (delta: 1.0MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 373.01ms. Allocated memory is still 98.6MB. Free memory was 69.9MB in the beginning and 59.7MB in the end (delta: 10.2MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 11644.72ms. Allocated memory was 98.6MB in the beginning and 151.0MB in the end (delta: 52.4MB). Free memory was 59.0MB in the beginning and 79.0MB in the end (delta: -20.1MB). Peak memory consumption was 32.7MB. Max. memory is 16.1GB. * Witness Printer took 87.60ms. Allocated memory is still 151.0MB. Free memory was 79.0MB in the beginning and 75.9MB in the end (delta: 3.1MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 41]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L38] int x = 5; VAL [x=5] [L39] CALL, EXPR fibo1(x) VAL [\old(n)=5] [L10] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L12] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=4] [L20] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L22] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L10] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L12] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L20] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L22] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L10] COND TRUE n < 1 [L11] return 0; VAL [\old(n)=0, \result=0, n=0] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L10] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L12] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L20] COND TRUE n < 1 [L21] return 0; VAL [\old(n)=0, \result=0, n=0] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=5, fibo2(n-1)=3, n=5] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=3] [L20] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L22] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L10] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L12] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L20] COND TRUE n < 1 [L21] return 0; VAL [\old(n)=0, \result=0, n=0] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=5, fibo2(n-1)=3, fibo2(n-2)=2, n=5] [L15] return fibo2(n-1) + fibo2(n-2); [L39] RET, EXPR fibo1(x) VAL [fibo1(x)=5, x=5] [L39] int result = fibo1(x); [L40] COND TRUE result == 5 VAL [result=5, x=5] [L41] reach_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 26 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 11.5s, OverallIterations: 10, TraceHistogramMax: 9, PathProgramHistogramMax: 3, EmptinessCheckTime: 0.1s, AutomataDifference: 2.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 374 SdHoareTripleChecker+Valid, 1.4s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 334 mSDsluCounter, 1047 SdHoareTripleChecker+Invalid, 1.2s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 882 mSDsCounter, 290 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 1583 IncrementalHoareTripleChecker+Invalid, 1873 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 290 mSolverCounterUnsat, 214 mSDtfsCounter, 1583 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 997 GetRequests, 831 SyntacticMatches, 28 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 489 ImplicationChecksByTransitivity, 1.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=77occurred in iteration=8, InterpolantAutomatonStates: 87, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 9 MinimizatonAttempts, 70 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 5.5s InterpolantComputationTime, 988 NumberOfCodeBlocks, 928 NumberOfCodeBlocksAsserted, 19 NumberOfCheckSat, 1292 ConstructedInterpolants, 0 QuantifiedInterpolants, 2411 SizeOfPredicates, 22 NumberOfNonLiveVariables, 1007 ConjunctsInSsa, 58 ConjunctsInUnsatCore, 23 InterpolantComputations, 2 PerfectInterpolantSequences, 1792/2283 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: OVERALL_TIME: 0.3s, ICFG_INTERPRETER_ENTERED_PROCEDURES: 3, DAG_INTERPRETER_EARLY_EXIT_QUERIES_NONTRIVIAL: 15, DAG_INTERPRETER_EARLY_EXITS: 6, TOOLS_POST_APPLICATIONS: 13, TOOLS_POST_TIME: 0.0s, TOOLS_POST_CALL_APPLICATIONS: 8, TOOLS_POST_CALL_TIME: 0.1s, TOOLS_POST_RETURN_APPLICATIONS: 6, TOOLS_POST_RETURN_TIME: 0.0s, TOOLS_QUANTIFIERELIM_APPLICATIONS: 27, TOOLS_QUANTIFIERELIM_TIME: 0.1s, TOOLS_QUANTIFIERELIM_MAX_TIME: 0.0s, FLUID_QUERY_TIME: 0.0s, FLUID_QUERIES: 35, FLUID_YES_ANSWERS: 0, DOMAIN_JOIN_APPLICATIONS: 1, DOMAIN_JOIN_TIME: 0.0s, DOMAIN_ALPHA_APPLICATIONS: 0, DOMAIN_ALPHA_TIME: 0.0s, DOMAIN_WIDEN_APPLICATIONS: 0, DOMAIN_WIDEN_TIME: 0.0s, DOMAIN_ISSUBSETEQ_APPLICATIONS: 0, DOMAIN_ISSUBSETEQ_TIME: 0.0s, DOMAIN_ISBOTTOM_APPLICATIONS: 15, DOMAIN_ISBOTTOM_TIME: 0.1s, LOOP_SUMMARIZER_APPLICATIONS: 0, LOOP_SUMMARIZER_CACHE_MISSES: 0, LOOP_SUMMARIZER_OVERALL_TIME: 0.0s, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 0, CALL_SUMMARIZER_APPLICATIONS: 6, CALL_SUMMARIZER_CACHE_MISSES: 2, CALL_SUMMARIZER_OVERALL_TIME: 0.1s, CALL_SUMMARIZER_NEW_COMPUTATION_TIME: 0.1s, PROCEDURE_GRAPH_BUILDER_TIME: 0.0s, PATH_EXPR_TIME: 0.0s, REGEX_TO_DAG_TIME: 0.0s, DAG_COMPRESSION_TIME: 0.0s, DAG_COMPRESSION_PROCESSED_NODES: 142, DAG_COMPRESSION_RETAINED_NODES: 53, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2022-11-03 02:40:37,490 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_571535e1-4e19-467b-9e9f-54897bb71843/bin/utaipan-7li7fVZpFI/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE