./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/fibo_25-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 527bcce2 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_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/fibo_25-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5 --witnessprinter.witness.filename witness --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 9030972e60093099261ffd255cd123d40a9b99982e16d5d1c2c77af1369268fd --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 19:44:54,305 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 19:44:54,405 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-21 19:44:54,409 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 19:44:54,410 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 19:44:54,447 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 19:44:54,448 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 19:44:54,448 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 19:44:54,449 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 19:44:54,454 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 19:44:54,455 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-21 19:44:54,456 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-21 19:44:54,456 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-21 19:44:54,458 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-21 19:44:54,458 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-21 19:44:54,459 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-21 19:44:54,459 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-21 19:44:54,459 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-21 19:44:54,460 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-21 19:44:54,460 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-21 19:44:54,461 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-21 19:44:54,461 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-21 19:44:54,462 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 19:44:54,463 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 19:44:54,463 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 19:44:54,463 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 19:44:54,464 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 19:44:54,464 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 19:44:54,465 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 19:44:54,465 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 19:44:54,466 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 19:44:54,466 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 19:44:54,467 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 19:44:54,467 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 19:44:54,467 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 19:44:54,467 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 19:44:54,468 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 19:44:54,468 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:44:54,468 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 19:44:54,468 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 19:44:54,468 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 19:44:54,471 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-21 19:44:54,471 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 19:44:54,471 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 19:44:54,472 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 19:44:54,472 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-21 19:44:54,472 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 19:44:54,472 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES 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_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9030972e60093099261ffd255cd123d40a9b99982e16d5d1c2c77af1369268fd [2023-11-21 19:44:54,792 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 19:44:54,826 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 19:44:54,828 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 19:44:54,831 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 19:44:54,831 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 19:44:54,833 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/../../sv-benchmarks/c/recursive-simple/fibo_25-2.c [2023-11-21 19:44:58,021 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 19:44:58,293 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 19:44:58,294 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/sv-benchmarks/c/recursive-simple/fibo_25-2.c [2023-11-21 19:44:58,302 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/data/eedb3e912/21b7bb9ed43c4729a386574de1e495a2/FLAG2b9fce14d [2023-11-21 19:44:58,326 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/data/eedb3e912/21b7bb9ed43c4729a386574de1e495a2 [2023-11-21 19:44:58,329 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 19:44:58,330 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 19:44:58,332 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 19:44:58,332 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 19:44:58,344 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 19:44:58,347 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:44:58" (1/1) ... [2023-11-21 19:44:58,349 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@213ad389 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:58, skipping insertion in model container [2023-11-21 19:44:58,349 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:44:58" (1/1) ... [2023-11-21 19:44:58,367 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 19:44:58,544 WARN L240 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_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/sv-benchmarks/c/recursive-simple/fibo_25-2.c[746,759] [2023-11-21 19:44:58,552 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:44:58,568 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 19:44:58,586 WARN L240 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_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/sv-benchmarks/c/recursive-simple/fibo_25-2.c[746,759] [2023-11-21 19:44:58,587 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:44:58,605 INFO L206 MainTranslator]: Completed translation [2023-11-21 19:44:58,606 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:58 WrapperNode [2023-11-21 19:44:58,606 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 19:44:58,608 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 19:44:58,608 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 19:44:58,609 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 19:44:58,616 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:58" (1/1) ... [2023-11-21 19:44:58,624 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:58" (1/1) ... [2023-11-21 19:44:58,638 INFO L138 Inliner]: procedures = 13, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 20 [2023-11-21 19:44:58,639 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 19:44:58,639 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 19:44:58,640 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 19:44:58,640 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 19:44:58,649 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:58" (1/1) ... [2023-11-21 19:44:58,649 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:58" (1/1) ... [2023-11-21 19:44:58,651 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:58" (1/1) ... [2023-11-21 19:44:58,651 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:58" (1/1) ... [2023-11-21 19:44:58,654 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:58" (1/1) ... [2023-11-21 19:44:58,656 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:58" (1/1) ... [2023-11-21 19:44:58,657 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:58" (1/1) ... [2023-11-21 19:44:58,657 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:58" (1/1) ... [2023-11-21 19:44:58,659 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 19:44:58,660 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 19:44:58,660 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 19:44:58,660 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 19:44:58,661 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:58" (1/1) ... [2023-11-21 19:44:58,667 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:44:58,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:44:58,696 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 19:44:58,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 19:44:58,741 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 19:44:58,741 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 19:44:58,742 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 19:44:58,742 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 19:44:58,744 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2023-11-21 19:44:58,745 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2023-11-21 19:44:58,801 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 19:44:58,803 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 19:44:58,924 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 19:44:58,945 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 19:44:58,945 INFO L308 CfgBuilder]: Removed 0 assume(true) statements. [2023-11-21 19:44:58,947 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:44:58 BoogieIcfgContainer [2023-11-21 19:44:58,947 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 19:44:58,949 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 19:44:58,949 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 19:44:58,953 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 19:44:58,953 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 07:44:58" (1/3) ... [2023-11-21 19:44:58,954 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ef9a4da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:44:58, skipping insertion in model container [2023-11-21 19:44:58,954 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:44:58" (2/3) ... [2023-11-21 19:44:58,955 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ef9a4da and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:44:58, skipping insertion in model container [2023-11-21 19:44:58,955 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:44:58" (3/3) ... [2023-11-21 19:44:58,956 INFO L112 eAbstractionObserver]: Analyzing ICFG fibo_25-2.c [2023-11-21 19:44:58,977 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 19:44:58,977 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-21 19:44:59,030 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 19:44:59,037 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=LoopHeads, 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;@2795b118, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 19:44:59,037 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-21 19:44:59,041 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-21 19:44:59,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-21 19:44:59,047 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:59,048 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:44:59,049 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:44:59,054 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:59,055 INFO L85 PathProgramCache]: Analyzing trace with hash -798924922, now seen corresponding path program 1 times [2023-11-21 19:44:59,065 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:59,065 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [212895545] [2023-11-21 19:44:59,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:59,066 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:59,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:59,393 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:44:59,394 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:59,394 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [212895545] [2023-11-21 19:44:59,395 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [212895545] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:44:59,395 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:44:59,395 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-21 19:44:59,397 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077247231] [2023-11-21 19:44:59,398 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:44:59,402 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 19:44:59,402 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:44:59,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 19:44:59,431 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:44:59,434 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 5 states, 4 states have (on average 1.75) 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) [2023-11-21 19:44:59,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:44:59,516 INFO L93 Difference]: Finished difference Result 25 states and 31 transitions. [2023-11-21 19:44:59,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-21 19:44:59,519 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) 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 [2023-11-21 19:44:59,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:44:59,527 INFO L225 Difference]: With dead ends: 25 [2023-11-21 19:44:59,527 INFO L226 Difference]: Without dead ends: 17 [2023-11-21 19:44:59,530 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:44:59,534 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 12 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:44:59,535 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 27 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:44:59,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-21 19:44:59,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-21 19:44:59,574 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-21 19:44:59,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-11-21 19:44:59,576 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 9 [2023-11-21 19:44:59,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:44:59,577 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-11-21 19:44:59,577 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) 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) [2023-11-21 19:44:59,578 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-11-21 19:44:59,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-21 19:44:59,579 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:59,579 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:44:59,580 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 19:44:59,580 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:44:59,581 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:59,581 INFO L85 PathProgramCache]: Analyzing trace with hash 1717873930, now seen corresponding path program 1 times [2023-11-21 19:44:59,581 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:59,582 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1277590524] [2023-11-21 19:44:59,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:59,582 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:59,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:44:59,711 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:44:59,712 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:44:59,712 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1277590524] [2023-11-21 19:44:59,712 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1277590524] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:44:59,712 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:44:59,713 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-21 19:44:59,713 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402610919] [2023-11-21 19:44:59,713 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:44:59,714 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 19:44:59,715 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:44:59,716 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 19:44:59,716 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:44:59,716 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 5 states, 4 states have (on average 2.0) 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) [2023-11-21 19:44:59,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:44:59,833 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2023-11-21 19:44:59,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-21 19:44:59,835 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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 [2023-11-21 19:44:59,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:44:59,838 INFO L225 Difference]: With dead ends: 23 [2023-11-21 19:44:59,838 INFO L226 Difference]: Without dead ends: 19 [2023-11-21 19:44:59,844 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:44:59,848 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 10 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:44:59,848 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 24 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:44:59,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-21 19:44:59,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 17. [2023-11-21 19:44:59,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 12 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (5), 3 states have call predecessors, (5), 3 states have call successors, (5) [2023-11-21 19:44:59,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-11-21 19:44:59,857 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 10 [2023-11-21 19:44:59,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:44:59,858 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-11-21 19:44:59,858 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 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) [2023-11-21 19:44:59,858 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-11-21 19:44:59,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-21 19:44:59,859 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:44:59,859 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:44:59,860 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-21 19:44:59,860 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:44:59,861 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:44:59,861 INFO L85 PathProgramCache]: Analyzing trace with hash 913644549, now seen corresponding path program 1 times [2023-11-21 19:44:59,861 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:44:59,861 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026699304] [2023-11-21 19:44:59,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:44:59,862 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:44:59,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:00,013 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-21 19:45:00,013 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:00,014 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026699304] [2023-11-21 19:45:00,014 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2026699304] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:00,014 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353806676] [2023-11-21 19:45:00,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:00,015 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:00,016 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:00,023 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:00,026 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 19:45:00,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:00,092 INFO L262 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-21 19:45:00,097 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:00,196 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-21 19:45:00,197 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:00,401 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 19:45:00,401 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353806676] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:00,401 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1875346154] [2023-11-21 19:45:00,424 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-21 19:45:00,424 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:00,429 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-21 19:45:00,431 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:00,432 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 11 [2023-11-21 19:45:00,432 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1824083037] [2023-11-21 19:45:00,432 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:00,433 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-21 19:45:00,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:00,434 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-21 19:45:00,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2023-11-21 19:45:00,435 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 11 states, 8 states have (on average 3.375) internal successors, (27), 11 states have internal predecessors, (27), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 2 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-21 19:45:00,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:00,552 INFO L93 Difference]: Finished difference Result 34 states and 45 transitions. [2023-11-21 19:45:00,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-21 19:45:00,553 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 3.375) internal successors, (27), 11 states have internal predecessors, (27), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 2 states have call predecessors, (8), 8 states have call successors, (8) Word has length 22 [2023-11-21 19:45:00,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:00,555 INFO L225 Difference]: With dead ends: 34 [2023-11-21 19:45:00,555 INFO L226 Difference]: Without dead ends: 19 [2023-11-21 19:45:00,556 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 40 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2023-11-21 19:45:00,557 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 15 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 89 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 89 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:00,558 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 59 Invalid, 100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 89 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:45:00,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-21 19:45:00,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-11-21 19:45:00,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 14 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2023-11-21 19:45:00,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2023-11-21 19:45:00,565 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 22 [2023-11-21 19:45:00,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:00,566 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2023-11-21 19:45:00,566 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 3.375) internal successors, (27), 11 states have internal predecessors, (27), 8 states have call successors, (8), 1 states have call predecessors, (8), 4 states have return successors, (8), 2 states have call predecessors, (8), 8 states have call successors, (8) [2023-11-21 19:45:00,567 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2023-11-21 19:45:00,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-21 19:45:00,568 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:00,568 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:00,585 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:00,779 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:00,779 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:00,780 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:00,780 INFO L85 PathProgramCache]: Analyzing trace with hash -252103063, now seen corresponding path program 1 times [2023-11-21 19:45:00,780 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:00,780 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [482360730] [2023-11-21 19:45:00,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:00,781 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:00,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:00,910 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-21 19:45:00,910 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:00,910 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [482360730] [2023-11-21 19:45:00,911 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [482360730] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:00,911 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [101852134] [2023-11-21 19:45:00,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:00,911 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:00,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:00,912 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:00,935 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 19:45:00,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:00,974 INFO L262 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-21 19:45:00,977 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:01,008 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-21 19:45:01,008 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:01,203 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 19:45:01,203 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [101852134] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:01,204 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [678314682] [2023-11-21 19:45:01,207 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-21 19:45:01,207 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:01,208 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-21 19:45:01,209 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:01,210 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2023-11-21 19:45:01,210 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489933828] [2023-11-21 19:45:01,210 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:01,211 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-21 19:45:01,211 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:01,212 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-21 19:45:01,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2023-11-21 19:45:01,213 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 9 states, 7 states have (on average 3.142857142857143) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-21 19:45:01,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:01,281 INFO L93 Difference]: Finished difference Result 28 states and 37 transitions. [2023-11-21 19:45:01,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:45:01,282 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 3.142857142857143) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 5 states have call successors, (5) Word has length 23 [2023-11-21 19:45:01,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:01,284 INFO L225 Difference]: With dead ends: 28 [2023-11-21 19:45:01,284 INFO L226 Difference]: Without dead ends: 24 [2023-11-21 19:45:01,285 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2023-11-21 19:45:01,289 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 15 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:01,291 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 30 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:45:01,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-21 19:45:01,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-11-21 19:45:01,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 17 states have internal predecessors, (17), 4 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (12), 5 states have call predecessors, (12), 4 states have call successors, (12) [2023-11-21 19:45:01,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2023-11-21 19:45:01,311 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 23 [2023-11-21 19:45:01,311 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:01,312 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2023-11-21 19:45:01,312 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 3.142857142857143) internal successors, (22), 9 states have internal predecessors, (22), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (5), 2 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-21 19:45:01,312 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2023-11-21 19:45:01,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-11-21 19:45:01,317 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:01,317 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:01,330 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:01,523 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:01,523 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:01,524 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:01,524 INFO L85 PathProgramCache]: Analyzing trace with hash 659330, now seen corresponding path program 2 times [2023-11-21 19:45:01,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:01,524 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325975788] [2023-11-21 19:45:01,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:01,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:01,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:01,704 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-21 19:45:01,704 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:01,704 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1325975788] [2023-11-21 19:45:01,704 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1325975788] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:01,705 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [426381535] [2023-11-21 19:45:01,705 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:45:01,705 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:01,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:01,706 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:01,727 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 19:45:01,764 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-21 19:45:01,765 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:45:01,766 INFO L262 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-21 19:45:01,769 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:01,824 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 18 proven. 8 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-21 19:45:01,824 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:02,020 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 18 proven. 9 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-21 19:45:02,020 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [426381535] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:02,021 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1212464918] [2023-11-21 19:45:02,023 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-21 19:45:02,023 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:02,024 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-21 19:45:02,024 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:02,024 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6, 7] total 14 [2023-11-21 19:45:02,024 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396110931] [2023-11-21 19:45:02,024 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:02,025 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-21 19:45:02,025 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:02,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-21 19:45:02,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=142, Unknown=0, NotChecked=0, Total=182 [2023-11-21 19:45:02,026 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand has 14 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 14 states have internal predecessors, (37), 7 states have call successors, (12), 1 states have call predecessors, (12), 5 states have return successors, (13), 8 states have call predecessors, (13), 7 states have call successors, (13) [2023-11-21 19:45:02,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:02,246 INFO L93 Difference]: Finished difference Result 55 states and 85 transitions. [2023-11-21 19:45:02,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-21 19:45:02,247 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 14 states have internal predecessors, (37), 7 states have call successors, (12), 1 states have call predecessors, (12), 5 states have return successors, (13), 8 states have call predecessors, (13), 7 states have call successors, (13) Word has length 36 [2023-11-21 19:45:02,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:02,248 INFO L225 Difference]: With dead ends: 55 [2023-11-21 19:45:02,249 INFO L226 Difference]: Without dead ends: 33 [2023-11-21 19:45:02,250 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2023-11-21 19:45:02,250 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 26 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 131 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 75 SdHoareTripleChecker+Invalid, 149 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:02,251 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 75 Invalid, 149 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 131 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:45:02,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2023-11-21 19:45:02,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 27. [2023-11-21 19:45:02,258 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 19 states have internal predecessors, (20), 4 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (11), 5 states have call predecessors, (11), 4 states have call successors, (11) [2023-11-21 19:45:02,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 35 transitions. [2023-11-21 19:45:02,259 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 35 transitions. Word has length 36 [2023-11-21 19:45:02,259 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:02,260 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 35 transitions. [2023-11-21 19:45:02,260 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 12 states have (on average 3.0833333333333335) internal successors, (37), 14 states have internal predecessors, (37), 7 states have call successors, (12), 1 states have call predecessors, (12), 5 states have return successors, (13), 8 states have call predecessors, (13), 7 states have call successors, (13) [2023-11-21 19:45:02,260 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 35 transitions. [2023-11-21 19:45:02,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-21 19:45:02,262 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:02,262 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:02,288 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:02,487 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:02,488 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:02,488 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:02,488 INFO L85 PathProgramCache]: Analyzing trace with hash 2099733774, now seen corresponding path program 3 times [2023-11-21 19:45:02,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:02,488 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126107751] [2023-11-21 19:45:02,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:02,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:02,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:02,591 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-21 19:45:02,592 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:02,592 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126107751] [2023-11-21 19:45:02,592 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126107751] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:02,592 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1064114040] [2023-11-21 19:45:02,592 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-21 19:45:02,592 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:02,593 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:02,593 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:02,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 19:45:02,649 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-21 19:45:02,649 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:45:02,650 INFO L262 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-21 19:45:02,652 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:02,690 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-11-21 19:45:02,690 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:03,017 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-21 19:45:03,017 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1064114040] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:03,018 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1168579348] [2023-11-21 19:45:03,022 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-21 19:45:03,022 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:03,023 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-21 19:45:03,023 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:03,023 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2023-11-21 19:45:03,024 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [728324267] [2023-11-21 19:45:03,024 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:03,025 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-21 19:45:03,025 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:03,026 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-21 19:45:03,026 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2023-11-21 19:45:03,027 INFO L87 Difference]: Start difference. First operand 27 states and 35 transitions. Second operand has 11 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 11 states have internal predecessors, (30), 7 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 3 states have call predecessors, (8), 7 states have call successors, (8) [2023-11-21 19:45:03,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:03,125 INFO L93 Difference]: Finished difference Result 36 states and 50 transitions. [2023-11-21 19:45:03,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-21 19:45:03,126 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 11 states have internal predecessors, (30), 7 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 3 states have call predecessors, (8), 7 states have call successors, (8) Word has length 37 [2023-11-21 19:45:03,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:03,129 INFO L225 Difference]: With dead ends: 36 [2023-11-21 19:45:03,129 INFO L226 Difference]: Without dead ends: 32 [2023-11-21 19:45:03,130 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 71 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2023-11-21 19:45:03,131 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 34 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:03,131 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 36 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:45:03,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-11-21 19:45:03,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-11-21 19:45:03,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 22 states have internal predecessors, (23), 5 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (18), 7 states have call predecessors, (18), 5 states have call successors, (18) [2023-11-21 19:45:03,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 46 transitions. [2023-11-21 19:45:03,146 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 46 transitions. Word has length 37 [2023-11-21 19:45:03,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:03,147 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 46 transitions. [2023-11-21 19:45:03,147 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 3.3333333333333335) internal successors, (30), 11 states have internal predecessors, (30), 7 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 3 states have call predecessors, (8), 7 states have call successors, (8) [2023-11-21 19:45:03,147 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 46 transitions. [2023-11-21 19:45:03,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2023-11-21 19:45:03,156 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:03,156 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 9, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:03,181 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:03,372 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:03,373 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:03,373 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:03,373 INFO L85 PathProgramCache]: Analyzing trace with hash -1019643787, now seen corresponding path program 4 times [2023-11-21 19:45:03,373 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:03,374 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [366197011] [2023-11-21 19:45:03,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:03,374 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:03,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:03,562 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 22 proven. 127 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2023-11-21 19:45:03,562 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:03,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [366197011] [2023-11-21 19:45:03,563 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [366197011] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:03,563 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1389385213] [2023-11-21 19:45:03,563 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-21 19:45:03,563 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:03,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:03,566 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:03,587 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-21 19:45:03,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:03,637 INFO L262 TraceCheckSpWp]: Trace formula consists of 194 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-21 19:45:03,641 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:03,702 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 22 proven. 127 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2023-11-21 19:45:03,702 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:04,273 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 22 proven. 142 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2023-11-21 19:45:04,274 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1389385213] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:04,274 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1067083482] [2023-11-21 19:45:04,276 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-21 19:45:04,277 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:04,277 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-21 19:45:04,277 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:04,277 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 13 [2023-11-21 19:45:04,278 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280442866] [2023-11-21 19:45:04,278 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:04,279 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-21 19:45:04,279 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:04,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-21 19:45:04,280 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2023-11-21 19:45:04,280 INFO L87 Difference]: Start difference. First operand 32 states and 46 transitions. Second operand has 13 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 13 states have internal predecessors, (39), 10 states have call successors, (11), 1 states have call predecessors, (11), 5 states have return successors, (13), 5 states have call predecessors, (13), 10 states have call successors, (13) [2023-11-21 19:45:04,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:04,399 INFO L93 Difference]: Finished difference Result 41 states and 63 transitions. [2023-11-21 19:45:04,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-21 19:45:04,400 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 13 states have internal predecessors, (39), 10 states have call successors, (11), 1 states have call predecessors, (11), 5 states have return successors, (13), 5 states have call predecessors, (13), 10 states have call successors, (13) Word has length 78 [2023-11-21 19:45:04,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:04,402 INFO L225 Difference]: With dead ends: 41 [2023-11-21 19:45:04,402 INFO L226 Difference]: Without dead ends: 37 [2023-11-21 19:45:04,403 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 150 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2023-11-21 19:45:04,403 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 25 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:04,404 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [34 Valid, 47 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:45:04,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2023-11-21 19:45:04,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2023-11-21 19:45:04,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 25 states have internal predecessors, (26), 6 states have call successors, (6), 2 states have call predecessors, (6), 6 states have return successors, (27), 9 states have call predecessors, (27), 6 states have call successors, (27) [2023-11-21 19:45:04,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 59 transitions. [2023-11-21 19:45:04,412 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 59 transitions. Word has length 78 [2023-11-21 19:45:04,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:04,413 INFO L495 AbstractCegarLoop]: Abstraction has 37 states and 59 transitions. [2023-11-21 19:45:04,413 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 3.5454545454545454) internal successors, (39), 13 states have internal predecessors, (39), 10 states have call successors, (11), 1 states have call predecessors, (11), 5 states have return successors, (13), 5 states have call predecessors, (13), 10 states have call successors, (13) [2023-11-21 19:45:04,413 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 59 transitions. [2023-11-21 19:45:04,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2023-11-21 19:45:04,415 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:04,416 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 17, 10, 10, 10, 10, 10, 10, 10, 7, 4, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:04,441 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:04,631 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:04,631 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:04,631 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:04,632 INFO L85 PathProgramCache]: Analyzing trace with hash 2016719210, now seen corresponding path program 5 times [2023-11-21 19:45:04,632 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:04,632 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1056697279] [2023-11-21 19:45:04,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:04,632 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:04,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:04,926 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 57 proven. 377 refuted. 0 times theorem prover too weak. 722 trivial. 0 not checked. [2023-11-21 19:45:04,927 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:04,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1056697279] [2023-11-21 19:45:04,927 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1056697279] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:04,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [579216032] [2023-11-21 19:45:04,927 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:45:04,927 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:04,928 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:04,928 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:04,955 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-21 19:45:05,034 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2023-11-21 19:45:05,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:45:05,036 INFO L262 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-21 19:45:05,047 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:05,163 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 393 proven. 34 refuted. 0 times theorem prover too weak. 729 trivial. 0 not checked. [2023-11-21 19:45:05,163 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:05,918 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 393 proven. 41 refuted. 0 times theorem prover too weak. 722 trivial. 0 not checked. [2023-11-21 19:45:05,919 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [579216032] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:05,919 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [149639883] [2023-11-21 19:45:05,922 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-21 19:45:05,922 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:05,922 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-21 19:45:05,923 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:05,924 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 11] total 20 [2023-11-21 19:45:05,924 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073269934] [2023-11-21 19:45:05,924 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:05,925 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2023-11-21 19:45:05,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:05,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2023-11-21 19:45:05,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2023-11-21 19:45:05,927 INFO L87 Difference]: Start difference. First operand 37 states and 59 transitions. Second operand has 20 states, 19 states have (on average 3.1578947368421053) internal successors, (60), 20 states have internal predecessors, (60), 13 states have call successors, (17), 1 states have call predecessors, (17), 11 states have return successors, (24), 13 states have call predecessors, (24), 13 states have call successors, (24) [2023-11-21 19:45:06,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:06,279 INFO L93 Difference]: Finished difference Result 95 states and 196 transitions. [2023-11-21 19:45:06,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-21 19:45:06,280 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 3.1578947368421053) internal successors, (60), 20 states have internal predecessors, (60), 13 states have call successors, (17), 1 states have call predecessors, (17), 11 states have return successors, (24), 13 states have call predecessors, (24), 13 states have call successors, (24) Word has length 146 [2023-11-21 19:45:06,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:06,287 INFO L225 Difference]: With dead ends: 95 [2023-11-21 19:45:06,287 INFO L226 Difference]: Without dead ends: 63 [2023-11-21 19:45:06,292 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 317 GetRequests, 282 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=272, Invalid=850, Unknown=0, NotChecked=0, Total=1122 [2023-11-21 19:45:06,294 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 80 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 284 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 128 SdHoareTripleChecker+Invalid, 362 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 284 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:06,294 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 128 Invalid, 362 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 284 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:45:06,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-11-21 19:45:06,314 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2023-11-21 19:45:06,314 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 44 states have (on average 1.0454545454545454) internal successors, (46), 43 states have internal predecessors, (46), 11 states have call successors, (11), 8 states have call predecessors, (11), 7 states have return successors, (24), 11 states have call predecessors, (24), 11 states have call successors, (24) [2023-11-21 19:45:06,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 81 transitions. [2023-11-21 19:45:06,316 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 81 transitions. Word has length 146 [2023-11-21 19:45:06,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:06,318 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 81 transitions. [2023-11-21 19:45:06,320 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 3.1578947368421053) internal successors, (60), 20 states have internal predecessors, (60), 13 states have call successors, (17), 1 states have call predecessors, (17), 11 states have return successors, (24), 13 states have call predecessors, (24), 13 states have call successors, (24) [2023-11-21 19:45:06,320 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 81 transitions. [2023-11-21 19:45:06,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2023-11-21 19:45:06,328 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:06,328 INFO L195 NwaCegarLoop]: trace histogram [31, 31, 25, 15, 15, 15, 15, 15, 15, 15, 10, 6, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:06,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:06,545 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:06,545 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:06,545 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:06,545 INFO L85 PathProgramCache]: Analyzing trace with hash -1272855121, now seen corresponding path program 6 times [2023-11-21 19:45:06,545 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:06,546 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2103614072] [2023-11-21 19:45:06,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:06,546 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:06,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:06,984 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 108 proven. 716 refuted. 0 times theorem prover too weak. 1756 trivial. 0 not checked. [2023-11-21 19:45:06,984 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:06,985 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2103614072] [2023-11-21 19:45:06,985 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2103614072] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:06,985 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1543174732] [2023-11-21 19:45:06,985 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-21 19:45:06,985 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:06,986 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:06,987 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:07,015 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-21 19:45:07,116 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-21 19:45:07,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:45:07,118 INFO L262 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-21 19:45:07,124 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:07,356 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 463 proven. 843 refuted. 0 times theorem prover too weak. 1274 trivial. 0 not checked. [2023-11-21 19:45:07,356 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:09,797 INFO L134 CoverageAnalysis]: Checked inductivity of 2580 backedges. 463 proven. 891 refuted. 0 times theorem prover too weak. 1226 trivial. 0 not checked. [2023-11-21 19:45:09,797 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1543174732] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:09,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1058177549] [2023-11-21 19:45:09,804 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-21 19:45:09,804 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:09,805 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-21 19:45:09,806 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:09,806 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15, 23] total 27 [2023-11-21 19:45:09,809 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241047411] [2023-11-21 19:45:09,809 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:09,811 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-11-21 19:45:09,812 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:09,815 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-11-21 19:45:09,816 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=586, Unknown=0, NotChecked=0, Total=702 [2023-11-21 19:45:09,817 INFO L87 Difference]: Start difference. First operand 63 states and 81 transitions. Second operand has 27 states, 26 states have (on average 3.1923076923076925) internal successors, (83), 27 states have internal predecessors, (83), 22 states have call successors, (24), 1 states have call predecessors, (24), 13 states have return successors, (32), 12 states have call predecessors, (32), 22 states have call successors, (32) [2023-11-21 19:45:10,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:10,361 INFO L93 Difference]: Finished difference Result 151 states and 238 transitions. [2023-11-21 19:45:10,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-11-21 19:45:10,362 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 3.1923076923076925) internal successors, (83), 27 states have internal predecessors, (83), 22 states have call successors, (24), 1 states have call predecessors, (24), 13 states have return successors, (32), 12 states have call predecessors, (32), 22 states have call successors, (32) Word has length 214 [2023-11-21 19:45:10,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:10,364 INFO L225 Difference]: With dead ends: 151 [2023-11-21 19:45:10,365 INFO L226 Difference]: Without dead ends: 94 [2023-11-21 19:45:10,366 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 405 SyntacticMatches, 11 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 472 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=561, Invalid=1695, Unknown=0, NotChecked=0, Total=2256 [2023-11-21 19:45:10,367 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 164 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 274 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 165 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 432 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:10,367 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [165 Valid, 126 Invalid, 432 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 274 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-21 19:45:10,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2023-11-21 19:45:10,380 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 87. [2023-11-21 19:45:10,381 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 60 states have internal predecessors, (65), 16 states have call successors, (16), 13 states have call predecessors, (16), 8 states have return successors, (40), 13 states have call predecessors, (40), 16 states have call successors, (40) [2023-11-21 19:45:10,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 121 transitions. [2023-11-21 19:45:10,382 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 121 transitions. Word has length 214 [2023-11-21 19:45:10,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:10,383 INFO L495 AbstractCegarLoop]: Abstraction has 87 states and 121 transitions. [2023-11-21 19:45:10,383 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 3.1923076923076925) internal successors, (83), 27 states have internal predecessors, (83), 22 states have call successors, (24), 1 states have call predecessors, (24), 13 states have return successors, (32), 12 states have call predecessors, (32), 22 states have call successors, (32) [2023-11-21 19:45:10,383 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 121 transitions. [2023-11-21 19:45:10,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 351 [2023-11-21 19:45:10,389 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:10,389 INFO L195 NwaCegarLoop]: trace histogram [51, 51, 41, 25, 25, 25, 25, 25, 25, 25, 16, 10, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:10,416 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:10,611 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:10,611 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:10,612 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:10,612 INFO L85 PathProgramCache]: Analyzing trace with hash -1898290875, now seen corresponding path program 7 times [2023-11-21 19:45:10,612 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:10,612 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1468807313] [2023-11-21 19:45:10,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:10,612 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:10,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:11,424 INFO L134 CoverageAnalysis]: Checked inductivity of 7120 backedges. 214 proven. 1491 refuted. 0 times theorem prover too weak. 5415 trivial. 0 not checked. [2023-11-21 19:45:11,424 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:11,424 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1468807313] [2023-11-21 19:45:11,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1468807313] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:11,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [986504975] [2023-11-21 19:45:11,425 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-21 19:45:11,425 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:11,425 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:11,426 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:11,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-21 19:45:11,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:11,633 INFO L262 TraceCheckSpWp]: Trace formula consists of 798 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-21 19:45:11,640 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:11,740 INFO L134 CoverageAnalysis]: Checked inductivity of 7120 backedges. 214 proven. 1491 refuted. 0 times theorem prover too weak. 5415 trivial. 0 not checked. [2023-11-21 19:45:11,740 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:14,173 INFO L134 CoverageAnalysis]: Checked inductivity of 7120 backedges. 214 proven. 1548 refuted. 0 times theorem prover too weak. 5358 trivial. 0 not checked. [2023-11-21 19:45:14,173 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [986504975] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:14,173 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [212415142] [2023-11-21 19:45:14,176 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-21 19:45:14,176 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:14,176 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-21 19:45:14,177 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:14,177 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 17] total 19 [2023-11-21 19:45:14,177 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173771326] [2023-11-21 19:45:14,178 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:14,180 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-21 19:45:14,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:14,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-21 19:45:14,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2023-11-21 19:45:14,181 INFO L87 Difference]: Start difference. First operand 87 states and 121 transitions. Second operand has 19 states, 17 states have (on average 3.3529411764705883) internal successors, (57), 19 states have internal predecessors, (57), 16 states have call successors, (17), 1 states have call predecessors, (17), 8 states have return successors, (22), 8 states have call predecessors, (22), 16 states have call successors, (22) [2023-11-21 19:45:14,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:14,334 INFO L93 Difference]: Finished difference Result 96 states and 141 transitions. [2023-11-21 19:45:14,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-21 19:45:14,335 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 3.3529411764705883) internal successors, (57), 19 states have internal predecessors, (57), 16 states have call successors, (17), 1 states have call predecessors, (17), 8 states have return successors, (22), 8 states have call predecessors, (22), 16 states have call successors, (22) Word has length 350 [2023-11-21 19:45:14,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:14,337 INFO L225 Difference]: With dead ends: 96 [2023-11-21 19:45:14,338 INFO L226 Difference]: Without dead ends: 92 [2023-11-21 19:45:14,338 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 722 GetRequests, 691 SyntacticMatches, 7 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2023-11-21 19:45:14,339 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 40 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 63 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:14,339 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 63 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:45:14,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-11-21 19:45:14,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2023-11-21 19:45:14,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 65 states have (on average 1.0461538461538462) internal successors, (68), 63 states have internal predecessors, (68), 17 states have call successors, (17), 13 states have call predecessors, (17), 9 states have return successors, (49), 15 states have call predecessors, (49), 17 states have call successors, (49) [2023-11-21 19:45:14,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 134 transitions. [2023-11-21 19:45:14,352 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 134 transitions. Word has length 350 [2023-11-21 19:45:14,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:14,353 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 134 transitions. [2023-11-21 19:45:14,353 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 3.3529411764705883) internal successors, (57), 19 states have internal predecessors, (57), 16 states have call successors, (17), 1 states have call predecessors, (17), 8 states have return successors, (22), 8 states have call predecessors, (22), 16 states have call successors, (22) [2023-11-21 19:45:14,353 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 134 transitions. [2023-11-21 19:45:14,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 501 [2023-11-21 19:45:14,363 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:14,364 INFO L195 NwaCegarLoop]: trace histogram [73, 73, 59, 36, 36, 36, 36, 36, 36, 36, 23, 14, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:14,388 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:14,583 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-21 19:45:14,583 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:14,584 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:14,584 INFO L85 PathProgramCache]: Analyzing trace with hash 1162383426, now seen corresponding path program 8 times [2023-11-21 19:45:14,584 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:14,584 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [325774793] [2023-11-21 19:45:14,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:14,585 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:14,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:15,663 INFO L134 CoverageAnalysis]: Checked inductivity of 14743 backedges. 376 proven. 2523 refuted. 0 times theorem prover too weak. 11844 trivial. 0 not checked. [2023-11-21 19:45:15,664 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:15,664 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [325774793] [2023-11-21 19:45:15,664 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [325774793] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:15,664 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [857019167] [2023-11-21 19:45:15,664 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:45:15,665 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:15,665 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:15,666 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:15,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-21 19:45:15,913 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2023-11-21 19:45:15,914 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:45:15,917 INFO L262 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-21 19:45:15,926 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:16,042 INFO L134 CoverageAnalysis]: Checked inductivity of 14743 backedges. 5016 proven. 123 refuted. 0 times theorem prover too weak. 9604 trivial. 0 not checked. [2023-11-21 19:45:16,043 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:17,693 INFO L134 CoverageAnalysis]: Checked inductivity of 14743 backedges. 1954 proven. 390 refuted. 0 times theorem prover too weak. 12399 trivial. 0 not checked. [2023-11-21 19:45:17,693 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [857019167] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:17,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1533465065] [2023-11-21 19:45:17,696 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-21 19:45:17,696 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:17,696 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-21 19:45:17,697 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:17,698 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10, 13] total 22 [2023-11-21 19:45:17,698 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200858876] [2023-11-21 19:45:17,698 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:17,699 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-21 19:45:17,700 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:17,700 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-21 19:45:17,701 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=373, Unknown=0, NotChecked=0, Total=462 [2023-11-21 19:45:17,701 INFO L87 Difference]: Start difference. First operand 92 states and 134 transitions. Second operand has 22 states, 21 states have (on average 3.6666666666666665) internal successors, (77), 22 states have internal predecessors, (77), 16 states have call successors, (25), 2 states have call predecessors, (25), 13 states have return successors, (36), 17 states have call predecessors, (36), 16 states have call successors, (36) [2023-11-21 19:45:18,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:18,332 INFO L93 Difference]: Finished difference Result 213 states and 376 transitions. [2023-11-21 19:45:18,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2023-11-21 19:45:18,333 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 3.6666666666666665) internal successors, (77), 22 states have internal predecessors, (77), 16 states have call successors, (25), 2 states have call predecessors, (25), 13 states have return successors, (36), 17 states have call predecessors, (36), 16 states have call successors, (36) Word has length 500 [2023-11-21 19:45:18,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:18,338 INFO L225 Difference]: With dead ends: 213 [2023-11-21 19:45:18,338 INFO L226 Difference]: Without dead ends: 131 [2023-11-21 19:45:18,341 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1047 GetRequests, 991 SyntacticMatches, 6 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 591 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=646, Invalid=2006, Unknown=0, NotChecked=0, Total=2652 [2023-11-21 19:45:18,341 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 186 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 278 mSolverCounterSat, 155 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 187 SdHoareTripleChecker+Valid, 115 SdHoareTripleChecker+Invalid, 433 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 155 IncrementalHoareTripleChecker+Valid, 278 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:18,342 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [187 Valid, 115 Invalid, 433 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [155 Valid, 278 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-21 19:45:18,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2023-11-21 19:45:18,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 120. [2023-11-21 19:45:18,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 120 states, 86 states have (on average 1.058139534883721) internal successors, (91), 83 states have internal predecessors, (91), 23 states have call successors, (23), 19 states have call predecessors, (23), 10 states have return successors, (59), 17 states have call predecessors, (59), 23 states have call successors, (59) [2023-11-21 19:45:18,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 173 transitions. [2023-11-21 19:45:18,370 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 173 transitions. Word has length 500 [2023-11-21 19:45:18,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:18,370 INFO L495 AbstractCegarLoop]: Abstraction has 120 states and 173 transitions. [2023-11-21 19:45:18,371 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 21 states have (on average 3.6666666666666665) internal successors, (77), 22 states have internal predecessors, (77), 16 states have call successors, (25), 2 states have call predecessors, (25), 13 states have return successors, (36), 17 states have call predecessors, (36), 16 states have call successors, (36) [2023-11-21 19:45:18,371 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 173 transitions. [2023-11-21 19:45:18,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 746 [2023-11-21 19:45:18,395 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:18,395 INFO L195 NwaCegarLoop]: trace histogram [109, 109, 88, 54, 54, 54, 54, 54, 54, 54, 34, 21, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:18,416 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:18,616 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-21 19:45:18,617 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:18,617 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:18,617 INFO L85 PathProgramCache]: Analyzing trace with hash -1994288690, now seen corresponding path program 9 times [2023-11-21 19:45:18,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:18,617 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [317766520] [2023-11-21 19:45:18,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:18,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:18,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:20,492 INFO L134 CoverageAnalysis]: Checked inductivity of 33096 backedges. 659 proven. 4380 refuted. 0 times theorem prover too weak. 28057 trivial. 0 not checked. [2023-11-21 19:45:20,493 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:20,493 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [317766520] [2023-11-21 19:45:20,493 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [317766520] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:20,494 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [111647104] [2023-11-21 19:45:20,494 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-21 19:45:20,494 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:20,494 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:20,495 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:20,519 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-21 19:45:20,853 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-21 19:45:20,853 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:45:20,860 INFO L262 TraceCheckSpWp]: Trace formula consists of 1675 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-21 19:45:20,874 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:20,996 INFO L134 CoverageAnalysis]: Checked inductivity of 33096 backedges. 659 proven. 4380 refuted. 0 times theorem prover too weak. 28057 trivial. 0 not checked. [2023-11-21 19:45:20,996 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:26,075 INFO L134 CoverageAnalysis]: Checked inductivity of 33096 backedges. 659 proven. 4480 refuted. 0 times theorem prover too weak. 27957 trivial. 0 not checked. [2023-11-21 19:45:26,076 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [111647104] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:26,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1833632161] [2023-11-21 19:45:26,078 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-21 19:45:26,078 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:26,078 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-21 19:45:26,079 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:26,079 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 21] total 23 [2023-11-21 19:45:26,080 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517782973] [2023-11-21 19:45:26,080 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:26,081 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-21 19:45:26,082 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:26,082 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-21 19:45:26,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2023-11-21 19:45:26,083 INFO L87 Difference]: Start difference. First operand 120 states and 173 transitions. Second operand has 23 states, 21 states have (on average 3.2857142857142856) internal successors, (69), 23 states have internal predecessors, (69), 20 states have call successors, (21), 1 states have call predecessors, (21), 10 states have return successors, (28), 10 states have call predecessors, (28), 20 states have call successors, (28) [2023-11-21 19:45:26,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:26,295 INFO L93 Difference]: Finished difference Result 129 states and 194 transitions. [2023-11-21 19:45:26,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-21 19:45:26,296 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 3.2857142857142856) internal successors, (69), 23 states have internal predecessors, (69), 20 states have call successors, (21), 1 states have call predecessors, (21), 10 states have return successors, (28), 10 states have call predecessors, (28), 20 states have call successors, (28) Word has length 745 [2023-11-21 19:45:26,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:26,299 INFO L225 Difference]: With dead ends: 129 [2023-11-21 19:45:26,300 INFO L226 Difference]: Without dead ends: 125 [2023-11-21 19:45:26,301 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1518 GetRequests, 1479 SyntacticMatches, 9 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2023-11-21 19:45:26,301 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 36 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 134 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:26,302 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 78 Invalid, 134 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 103 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:45:26,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2023-11-21 19:45:26,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2023-11-21 19:45:26,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 89 states have (on average 1.0561797752808988) internal successors, (94), 86 states have internal predecessors, (94), 24 states have call successors, (24), 19 states have call predecessors, (24), 11 states have return successors, (69), 19 states have call predecessors, (69), 24 states have call successors, (69) [2023-11-21 19:45:26,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 187 transitions. [2023-11-21 19:45:26,314 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 187 transitions. Word has length 745 [2023-11-21 19:45:26,315 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:26,315 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 187 transitions. [2023-11-21 19:45:26,316 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 3.2857142857142856) internal successors, (69), 23 states have internal predecessors, (69), 20 states have call successors, (21), 1 states have call predecessors, (21), 10 states have return successors, (28), 10 states have call predecessors, (28), 20 states have call successors, (28) [2023-11-21 19:45:26,316 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 187 transitions. [2023-11-21 19:45:26,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1318 [2023-11-21 19:45:26,333 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:26,334 INFO L195 NwaCegarLoop]: trace histogram [193, 193, 156, 96, 96, 96, 96, 96, 96, 96, 60, 37, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:26,367 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:26,547 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-21 19:45:26,547 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:26,547 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:26,547 INFO L85 PathProgramCache]: Analyzing trace with hash -291355840, now seen corresponding path program 10 times [2023-11-21 19:45:26,548 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:26,548 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [157900563] [2023-11-21 19:45:26,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:26,548 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:27,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:30,709 INFO L134 CoverageAnalysis]: Checked inductivity of 104442 backedges. 1204 proven. 9076 refuted. 0 times theorem prover too weak. 94162 trivial. 0 not checked. [2023-11-21 19:45:30,710 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:30,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [157900563] [2023-11-21 19:45:30,710 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [157900563] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:30,710 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [620136353] [2023-11-21 19:45:30,710 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-21 19:45:30,710 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:30,711 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:30,712 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:30,731 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-21 19:45:31,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:31,295 INFO L262 TraceCheckSpWp]: Trace formula consists of 2945 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-21 19:45:31,319 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:31,515 INFO L134 CoverageAnalysis]: Checked inductivity of 104442 backedges. 1204 proven. 9076 refuted. 0 times theorem prover too weak. 94162 trivial. 0 not checked. [2023-11-21 19:45:31,515 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:38,873 INFO L134 CoverageAnalysis]: Checked inductivity of 104442 backedges. 1204 proven. 9202 refuted. 0 times theorem prover too weak. 94036 trivial. 0 not checked. [2023-11-21 19:45:38,874 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [620136353] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:38,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [161411930] [2023-11-21 19:45:38,878 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-21 19:45:38,878 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:38,879 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:96) 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:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) 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:337) 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:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) 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) [2023-11-21 19:45:38,880 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:38,881 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 25 [2023-11-21 19:45:38,882 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713526248] [2023-11-21 19:45:38,883 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:38,887 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-21 19:45:38,887 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:38,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-21 19:45:38,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2023-11-21 19:45:38,890 INFO L87 Difference]: Start difference. First operand 125 states and 187 transitions. Second operand has 25 states, 23 states have (on average 3.260869565217391) internal successors, (75), 25 states have internal predecessors, (75), 22 states have call successors, (23), 1 states have call predecessors, (23), 11 states have return successors, (31), 11 states have call predecessors, (31), 22 states have call successors, (31) [2023-11-21 19:45:39,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:39,228 INFO L93 Difference]: Finished difference Result 134 states and 210 transitions. [2023-11-21 19:45:39,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-21 19:45:39,229 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 23 states have (on average 3.260869565217391) internal successors, (75), 25 states have internal predecessors, (75), 22 states have call successors, (23), 1 states have call predecessors, (23), 11 states have return successors, (31), 11 states have call predecessors, (31), 22 states have call successors, (31) Word has length 1317 [2023-11-21 19:45:39,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:39,233 INFO L225 Difference]: With dead ends: 134 [2023-11-21 19:45:39,233 INFO L226 Difference]: Without dead ends: 130 [2023-11-21 19:45:39,235 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2665 GetRequests, 2622 SyntacticMatches, 10 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2023-11-21 19:45:39,235 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 173 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 237 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 190 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 237 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:39,235 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [190 Valid, 83 Invalid, 339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [237 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:45:39,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2023-11-21 19:45:39,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2023-11-21 19:45:39,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 92 states have (on average 1.0543478260869565) internal successors, (97), 89 states have internal predecessors, (97), 25 states have call successors, (25), 19 states have call predecessors, (25), 12 states have return successors, (81), 21 states have call predecessors, (81), 25 states have call successors, (81) [2023-11-21 19:45:39,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 203 transitions. [2023-11-21 19:45:39,249 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 203 transitions. Word has length 1317 [2023-11-21 19:45:39,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:39,250 INFO L495 AbstractCegarLoop]: Abstraction has 130 states and 203 transitions. [2023-11-21 19:45:39,250 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 23 states have (on average 3.260869565217391) internal successors, (75), 25 states have internal predecessors, (75), 22 states have call successors, (23), 1 states have call predecessors, (23), 11 states have return successors, (31), 11 states have call predecessors, (31), 22 states have call successors, (31) [2023-11-21 19:45:39,251 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 203 transitions. [2023-11-21 19:45:39,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2571 [2023-11-21 19:45:39,306 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:39,307 INFO L195 NwaCegarLoop]: trace histogram [377, 377, 305, 188, 188, 188, 188, 188, 188, 188, 117, 72, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:39,335 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:39,530 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7d2a3a7-71f2-418e-b4dd-778cf8ebc185/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-21 19:45:39,530 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:39,531 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:39,531 INFO L85 PathProgramCache]: Analyzing trace with hash 2036180518, now seen corresponding path program 11 times [2023-11-21 19:45:39,531 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:39,532 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1442678752] [2023-11-21 19:45:39,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:39,532 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:40,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat