./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/MultCommutative-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 8393723b 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_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/MultCommutative-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash ce29b37e076ab683230ebf17073db3b7759ea39570dd2ef64322b6d43bb636cd --- Real Ultimate output --- [0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset. This is Ultimate 0.2.2-dev-8393723 [2022-11-19 06:40:13,428 INFO L177 SettingsManager]: Resetting all preferences to default values... [2022-11-19 06:40:13,430 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2022-11-19 06:40:13,453 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2022-11-19 06:40:13,454 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2022-11-19 06:40:13,455 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2022-11-19 06:40:13,457 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2022-11-19 06:40:13,459 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2022-11-19 06:40:13,461 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2022-11-19 06:40:13,462 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2022-11-19 06:40:13,463 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2022-11-19 06:40:13,471 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2022-11-19 06:40:13,471 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2022-11-19 06:40:13,472 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2022-11-19 06:40:13,473 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2022-11-19 06:40:13,475 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2022-11-19 06:40:13,476 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2022-11-19 06:40:13,477 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2022-11-19 06:40:13,485 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2022-11-19 06:40:13,492 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2022-11-19 06:40:13,497 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2022-11-19 06:40:13,504 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2022-11-19 06:40:13,505 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2022-11-19 06:40:13,508 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2022-11-19 06:40:13,513 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2022-11-19 06:40:13,517 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2022-11-19 06:40:13,518 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2022-11-19 06:40:13,519 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2022-11-19 06:40:13,520 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2022-11-19 06:40:13,521 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2022-11-19 06:40:13,522 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2022-11-19 06:40:13,523 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2022-11-19 06:40:13,524 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2022-11-19 06:40:13,525 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2022-11-19 06:40:13,527 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2022-11-19 06:40:13,528 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2022-11-19 06:40:13,529 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2022-11-19 06:40:13,530 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2022-11-19 06:40:13,531 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2022-11-19 06:40:13,532 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2022-11-19 06:40:13,533 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2022-11-19 06:40:13,534 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/config/svcomp-Reach-32bit-Taipan_Default.epf [2022-11-19 06:40:13,577 INFO L113 SettingsManager]: Loading preferences was successful [2022-11-19 06:40:13,577 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2022-11-19 06:40:13,578 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2022-11-19 06:40:13,578 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2022-11-19 06:40:13,579 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2022-11-19 06:40:13,579 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2022-11-19 06:40:13,579 INFO L138 SettingsManager]: * User list type=DISABLED [2022-11-19 06:40:13,580 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2022-11-19 06:40:13,580 INFO L138 SettingsManager]: * Explicit value domain=true [2022-11-19 06:40:13,580 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2022-11-19 06:40:13,581 INFO L138 SettingsManager]: * Octagon Domain=false [2022-11-19 06:40:13,581 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2022-11-19 06:40:13,582 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2022-11-19 06:40:13,582 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2022-11-19 06:40:13,582 INFO L138 SettingsManager]: * Interval Domain=false [2022-11-19 06:40:13,582 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2022-11-19 06:40:13,582 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2022-11-19 06:40:13,583 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2022-11-19 06:40:13,583 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2022-11-19 06:40:13,584 INFO L138 SettingsManager]: * sizeof long=4 [2022-11-19 06:40:13,584 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2022-11-19 06:40:13,584 INFO L138 SettingsManager]: * sizeof POINTER=4 [2022-11-19 06:40:13,584 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2022-11-19 06:40:13,584 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2022-11-19 06:40:13,585 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2022-11-19 06:40:13,585 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2022-11-19 06:40:13,585 INFO L138 SettingsManager]: * sizeof long double=12 [2022-11-19 06:40:13,585 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2022-11-19 06:40:13,585 INFO L138 SettingsManager]: * Use constant arrays=true [2022-11-19 06:40:13,586 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2022-11-19 06:40:13,586 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2022-11-19 06:40:13,586 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2022-11-19 06:40:13,586 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 06:40:13,587 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2022-11-19 06:40:13,587 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2022-11-19 06:40:13,587 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2022-11-19 06:40:13,587 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2022-11-19 06:40:13,588 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2022-11-19 06:40:13,588 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2022-11-19 06:40:13,588 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2022-11-19 06:40:13,588 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2022-11-19 06:40:13,588 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ce29b37e076ab683230ebf17073db3b7759ea39570dd2ef64322b6d43bb636cd [2022-11-19 06:40:13,944 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2022-11-19 06:40:13,979 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2022-11-19 06:40:13,982 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2022-11-19 06:40:13,983 INFO L271 PluginConnector]: Initializing CDTParser... [2022-11-19 06:40:13,984 INFO L275 PluginConnector]: CDTParser initialized [2022-11-19 06:40:13,985 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/../../sv-benchmarks/c/recursive/MultCommutative-2.c [2022-11-19 06:40:14,084 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/data/d54f9afb2/d4d358728cd142809494e2032eee968a/FLAG260dea4b2 [2022-11-19 06:40:14,627 INFO L306 CDTParser]: Found 1 translation units. [2022-11-19 06:40:14,628 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/sv-benchmarks/c/recursive/MultCommutative-2.c [2022-11-19 06:40:14,633 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/data/d54f9afb2/d4d358728cd142809494e2032eee968a/FLAG260dea4b2 [2022-11-19 06:40:15,041 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/data/d54f9afb2/d4d358728cd142809494e2032eee968a [2022-11-19 06:40:15,044 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2022-11-19 06:40:15,047 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2022-11-19 06:40:15,052 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2022-11-19 06:40:15,052 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2022-11-19 06:40:15,056 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2022-11-19 06:40:15,056 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 06:40:15" (1/1) ... [2022-11-19 06:40:15,058 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@182d85d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:40:15, skipping insertion in model container [2022-11-19 06:40:15,058 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 06:40:15" (1/1) ... [2022-11-19 06:40:15,065 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2022-11-19 06:40:15,080 INFO L178 MainTranslator]: Built tables and reachable declarations [2022-11-19 06:40:15,281 WARN L234 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_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/sv-benchmarks/c/recursive/MultCommutative-2.c[970,983] [2022-11-19 06:40:15,286 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 06:40:15,297 INFO L203 MainTranslator]: Completed pre-run [2022-11-19 06:40:15,323 WARN L234 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_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/sv-benchmarks/c/recursive/MultCommutative-2.c[970,983] [2022-11-19 06:40:15,324 INFO L210 PostProcessor]: Analyzing one entry point: main [2022-11-19 06:40:15,345 INFO L208 MainTranslator]: Completed translation [2022-11-19 06:40:15,346 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:40:15 WrapperNode [2022-11-19 06:40:15,346 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2022-11-19 06:40:15,347 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2022-11-19 06:40:15,347 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2022-11-19 06:40:15,347 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2022-11-19 06:40:15,355 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:40:15" (1/1) ... [2022-11-19 06:40:15,363 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:40:15" (1/1) ... [2022-11-19 06:40:15,382 INFO L138 Inliner]: procedures = 13, calls = 11, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 36 [2022-11-19 06:40:15,383 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2022-11-19 06:40:15,384 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2022-11-19 06:40:15,384 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2022-11-19 06:40:15,384 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2022-11-19 06:40:15,393 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:40:15" (1/1) ... [2022-11-19 06:40:15,393 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:40:15" (1/1) ... [2022-11-19 06:40:15,396 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:40:15" (1/1) ... [2022-11-19 06:40:15,396 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:40:15" (1/1) ... [2022-11-19 06:40:15,399 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:40:15" (1/1) ... [2022-11-19 06:40:15,401 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:40:15" (1/1) ... [2022-11-19 06:40:15,402 INFO L185 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:40:15" (1/1) ... [2022-11-19 06:40:15,403 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:40:15" (1/1) ... [2022-11-19 06:40:15,404 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2022-11-19 06:40:15,405 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2022-11-19 06:40:15,406 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2022-11-19 06:40:15,406 INFO L275 PluginConnector]: RCFGBuilder initialized [2022-11-19 06:40:15,407 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:40:15" (1/1) ... [2022-11-19 06:40:15,425 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2022-11-19 06:40:15,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:40:15,458 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2022-11-19 06:40:15,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2022-11-19 06:40:15,495 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2022-11-19 06:40:15,495 INFO L130 BoogieDeclarations]: Found specification of procedure mult [2022-11-19 06:40:15,495 INFO L138 BoogieDeclarations]: Found implementation of procedure mult [2022-11-19 06:40:15,496 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2022-11-19 06:40:15,496 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2022-11-19 06:40:15,496 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2022-11-19 06:40:15,565 INFO L235 CfgBuilder]: Building ICFG [2022-11-19 06:40:15,567 INFO L261 CfgBuilder]: Building CFG for each procedure with an implementation [2022-11-19 06:40:15,752 INFO L276 CfgBuilder]: Performing block encoding [2022-11-19 06:40:15,766 INFO L295 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2022-11-19 06:40:15,766 INFO L300 CfgBuilder]: Removed 0 assume(true) statements. [2022-11-19 06:40:15,769 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 06:40:15 BoogieIcfgContainer [2022-11-19 06:40:15,769 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2022-11-19 06:40:15,771 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2022-11-19 06:40:15,772 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2022-11-19 06:40:15,775 INFO L275 PluginConnector]: TraceAbstraction initialized [2022-11-19 06:40:15,775 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 06:40:15" (1/3) ... [2022-11-19 06:40:15,776 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ed197aa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 06:40:15, skipping insertion in model container [2022-11-19 06:40:15,777 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 06:40:15" (2/3) ... [2022-11-19 06:40:15,777 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ed197aa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 06:40:15, skipping insertion in model container [2022-11-19 06:40:15,777 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 06:40:15" (3/3) ... [2022-11-19 06:40:15,779 INFO L112 eAbstractionObserver]: Analyzing ICFG MultCommutative-2.c [2022-11-19 06:40:15,798 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2022-11-19 06:40:15,798 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2022-11-19 06:40:15,848 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2022-11-19 06:40:15,855 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@51b9b37d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2022-11-19 06:40:15,855 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2022-11-19 06:40:15,859 INFO L276 IsEmpty]: Start isEmpty. Operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2022-11-19 06:40:15,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2022-11-19 06:40:15,868 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:40:15,869 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:40:15,870 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:40:15,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:40:15,875 INFO L85 PathProgramCache]: Analyzing trace with hash 647179642, now seen corresponding path program 1 times [2022-11-19 06:40:15,885 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:40:15,886 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [778949001] [2022-11-19 06:40:15,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:15,887 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:40:15,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:40:16,351 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2022-11-19 06:40:16,352 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:40:16,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [778949001] [2022-11-19 06:40:16,353 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [778949001] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:40:16,353 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:40:16,354 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2022-11-19 06:40:16,356 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188361097] [2022-11-19 06:40:16,357 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:40:16,362 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2022-11-19 06:40:16,370 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:40:16,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2022-11-19 06:40:16,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2022-11-19 06:40:16,421 INFO L87 Difference]: Start difference. First operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 06:40:16,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:40:16,616 INFO L93 Difference]: Finished difference Result 39 states and 50 transitions. [2022-11-19 06:40:16,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2022-11-19 06:40:16,621 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2022-11-19 06:40:16,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:40:16,633 INFO L225 Difference]: With dead ends: 39 [2022-11-19 06:40:16,634 INFO L226 Difference]: Without dead ends: 27 [2022-11-19 06:40:16,637 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2022-11-19 06:40:16,640 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 10 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:40:16,642 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 121 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:40:16,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2022-11-19 06:40:16,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 23. [2022-11-19 06:40:16,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 5 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2022-11-19 06:40:16,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2022-11-19 06:40:16,686 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 19 [2022-11-19 06:40:16,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:40:16,686 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2022-11-19 06:40:16,687 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2022-11-19 06:40:16,687 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2022-11-19 06:40:16,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2022-11-19 06:40:16,689 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:40:16,689 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:40:16,690 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2022-11-19 06:40:16,690 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:40:16,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:40:16,691 INFO L85 PathProgramCache]: Analyzing trace with hash 1580415186, now seen corresponding path program 1 times [2022-11-19 06:40:16,691 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:40:16,692 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [459228886] [2022-11-19 06:40:16,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:16,692 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:40:16,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:40:16,877 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2022-11-19 06:40:16,878 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:40:16,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [459228886] [2022-11-19 06:40:16,879 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [459228886] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:40:16,880 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:40:16,880 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2022-11-19 06:40:16,880 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948387811] [2022-11-19 06:40:16,881 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:40:16,882 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2022-11-19 06:40:16,883 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:40:16,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2022-11-19 06:40:16,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2022-11-19 06:40:16,885 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-19 06:40:16,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:40:16,989 INFO L93 Difference]: Finished difference Result 36 states and 49 transitions. [2022-11-19 06:40:16,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2022-11-19 06:40:16,990 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2022-11-19 06:40:16,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:40:16,994 INFO L225 Difference]: With dead ends: 36 [2022-11-19 06:40:16,995 INFO L226 Difference]: Without dead ends: 32 [2022-11-19 06:40:16,997 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2022-11-19 06:40:16,999 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 4 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:40:17,000 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 123 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:40:17,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2022-11-19 06:40:17,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2022-11-19 06:40:17,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 5 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (9), 6 states have call predecessors, (9), 5 states have call successors, (9) [2022-11-19 06:40:17,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2022-11-19 06:40:17,014 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 25 [2022-11-19 06:40:17,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:40:17,015 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2022-11-19 06:40:17,015 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-19 06:40:17,015 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2022-11-19 06:40:17,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-19 06:40:17,017 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:40:17,017 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:40:17,017 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2022-11-19 06:40:17,017 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:40:17,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:40:17,018 INFO L85 PathProgramCache]: Analyzing trace with hash -124187766, now seen corresponding path program 1 times [2022-11-19 06:40:17,019 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:40:17,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1455004930] [2022-11-19 06:40:17,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:17,021 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:40:17,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:40:17,122 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-19 06:40:17,123 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:40:17,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1455004930] [2022-11-19 06:40:17,123 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1455004930] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:40:17,123 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1832873155] [2022-11-19 06:40:17,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:17,124 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:17,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:40:17,128 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:40:17,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2022-11-19 06:40:17,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:40:17,207 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 4 conjunts are in the unsatisfiable core [2022-11-19 06:40:17,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:40:17,286 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-19 06:40:17,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:40:17,368 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-19 06:40:17,368 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1832873155] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:40:17,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1384285018] [2022-11-19 06:40:17,393 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:40:17,394 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:40:17,399 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:40:17,404 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:40:17,405 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 6 [2022-11-19 06:40:17,405 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [616968476] [2022-11-19 06:40:17,405 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:40:17,406 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2022-11-19 06:40:17,407 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:40:17,408 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2022-11-19 06:40:17,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:40:17,409 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-19 06:40:17,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:40:17,489 INFO L93 Difference]: Finished difference Result 32 states and 46 transitions. [2022-11-19 06:40:17,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 06:40:17,490 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2022-11-19 06:40:17,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:40:17,493 INFO L225 Difference]: With dead ends: 32 [2022-11-19 06:40:17,493 INFO L226 Difference]: Without dead ends: 24 [2022-11-19 06:40:17,493 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 50 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2022-11-19 06:40:17,498 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 8 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:40:17,500 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 41 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:40:17,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-11-19 06:40:17,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2022-11-19 06:40:17,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2022-11-19 06:40:17,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 27 transitions. [2022-11-19 06:40:17,511 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 27 transitions. Word has length 26 [2022-11-19 06:40:17,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:40:17,512 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 27 transitions. [2022-11-19 06:40:17,512 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2022-11-19 06:40:17,512 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 27 transitions. [2022-11-19 06:40:17,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2022-11-19 06:40:17,513 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:40:17,513 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:40:17,524 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2022-11-19 06:40:17,719 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:17,720 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:40:17,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:40:17,720 INFO L85 PathProgramCache]: Analyzing trace with hash -590605896, now seen corresponding path program 2 times [2022-11-19 06:40:17,721 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:40:17,721 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073881658] [2022-11-19 06:40:17,721 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:17,721 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:40:17,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:40:17,826 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2022-11-19 06:40:17,827 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:40:17,827 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073881658] [2022-11-19 06:40:17,827 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2073881658] provided 1 perfect and 0 imperfect interpolant sequences [2022-11-19 06:40:17,828 INFO L184 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2022-11-19 06:40:17,828 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2022-11-19 06:40:17,828 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927818264] [2022-11-19 06:40:17,828 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2022-11-19 06:40:17,829 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2022-11-19 06:40:17,829 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:40:17,829 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2022-11-19 06:40:17,830 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2022-11-19 06:40:17,830 INFO L87 Difference]: Start difference. First operand 21 states and 27 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-19 06:40:17,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:40:17,887 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2022-11-19 06:40:17,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2022-11-19 06:40:17,888 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 26 [2022-11-19 06:40:17,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:40:17,889 INFO L225 Difference]: With dead ends: 25 [2022-11-19 06:40:17,889 INFO L226 Difference]: Without dead ends: 21 [2022-11-19 06:40:17,890 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2022-11-19 06:40:17,891 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 8 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:40:17,891 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 36 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2022-11-19 06:40:17,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2022-11-19 06:40:17,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2022-11-19 06:40:17,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2022-11-19 06:40:17,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2022-11-19 06:40:17,897 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 26 [2022-11-19 06:40:17,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:40:17,897 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2022-11-19 06:40:17,898 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2022-11-19 06:40:17,898 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2022-11-19 06:40:17,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2022-11-19 06:40:17,899 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:40:17,899 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:40:17,899 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2022-11-19 06:40:17,899 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:40:17,900 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:40:17,900 INFO L85 PathProgramCache]: Analyzing trace with hash 132154764, now seen corresponding path program 3 times [2022-11-19 06:40:17,900 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:40:17,900 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429297294] [2022-11-19 06:40:17,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:17,900 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:40:17,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:40:18,521 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2022-11-19 06:40:18,522 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:40:18,522 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429297294] [2022-11-19 06:40:18,525 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [429297294] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:40:18,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1817518359] [2022-11-19 06:40:18,528 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:40:18,528 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:18,528 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:40:18,536 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:40:18,551 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2022-11-19 06:40:18,607 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:40:18,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:40:18,614 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 41 conjunts are in the unsatisfiable core [2022-11-19 06:40:18,617 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:40:18,970 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2022-11-19 06:40:18,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:40:20,295 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 06:40:20,295 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1817518359] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:40:20,296 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1583335580] [2022-11-19 06:40:20,303 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:40:20,304 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:40:20,304 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:40:20,305 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:40:20,305 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 11, 14] total 35 [2022-11-19 06:40:20,305 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411447384] [2022-11-19 06:40:20,305 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:40:20,307 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2022-11-19 06:40:20,307 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:40:20,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2022-11-19 06:40:20,308 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1061, Unknown=0, NotChecked=0, Total=1190 [2022-11-19 06:40:20,308 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 35 states, 32 states have (on average 1.53125) internal successors, (49), 24 states have internal predecessors, (49), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) [2022-11-19 06:40:21,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:40:21,186 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2022-11-19 06:40:21,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2022-11-19 06:40:21,187 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 32 states have (on average 1.53125) internal successors, (49), 24 states have internal predecessors, (49), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) Word has length 33 [2022-11-19 06:40:21,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:40:21,188 INFO L225 Difference]: With dead ends: 40 [2022-11-19 06:40:21,188 INFO L226 Difference]: Without dead ends: 36 [2022-11-19 06:40:21,189 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=293, Invalid=1777, Unknown=0, NotChecked=0, Total=2070 [2022-11-19 06:40:21,190 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 81 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 385 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 459 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 385 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2022-11-19 06:40:21,190 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 147 Invalid, 459 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 385 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2022-11-19 06:40:21,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2022-11-19 06:40:21,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 28. [2022-11-19 06:40:21,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 20 states have internal predecessors, (20), 5 states have call successors, (5), 1 states have call predecessors, (5), 4 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) [2022-11-19 06:40:21,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2022-11-19 06:40:21,199 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 33 [2022-11-19 06:40:21,199 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:40:21,199 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2022-11-19 06:40:21,200 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 32 states have (on average 1.53125) internal successors, (49), 24 states have internal predecessors, (49), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) [2022-11-19 06:40:21,200 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2022-11-19 06:40:21,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2022-11-19 06:40:21,201 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:40:21,201 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:40:21,212 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2022-11-19 06:40:21,407 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:21,408 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:40:21,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:40:21,408 INFO L85 PathProgramCache]: Analyzing trace with hash 169705396, now seen corresponding path program 1 times [2022-11-19 06:40:21,408 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:40:21,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1222108019] [2022-11-19 06:40:21,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:21,409 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:40:21,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:40:21,474 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-19 06:40:21,474 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:40:21,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1222108019] [2022-11-19 06:40:21,474 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1222108019] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:40:21,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1801652588] [2022-11-19 06:40:21,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:21,475 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:21,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:40:21,476 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:40:21,484 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2022-11-19 06:40:21,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:40:21,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 6 conjunts are in the unsatisfiable core [2022-11-19 06:40:21,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:40:21,601 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2022-11-19 06:40:21,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:40:21,779 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2022-11-19 06:40:21,779 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1801652588] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:40:21,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [558796370] [2022-11-19 06:40:21,781 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2022-11-19 06:40:21,781 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:40:21,782 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:40:21,782 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:40:21,782 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 10 [2022-11-19 06:40:21,782 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946474043] [2022-11-19 06:40:21,783 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:40:21,783 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2022-11-19 06:40:21,783 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:40:21,783 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2022-11-19 06:40:21,784 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2022-11-19 06:40:21,784 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-19 06:40:21,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:40:21,922 INFO L93 Difference]: Finished difference Result 56 states and 82 transitions. [2022-11-19 06:40:21,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2022-11-19 06:40:21,923 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 39 [2022-11-19 06:40:21,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:40:21,924 INFO L225 Difference]: With dead ends: 56 [2022-11-19 06:40:21,924 INFO L226 Difference]: Without dead ends: 24 [2022-11-19 06:40:21,925 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=81, Invalid=159, Unknown=0, NotChecked=0, Total=240 [2022-11-19 06:40:21,925 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 31 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:40:21,926 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 58 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2022-11-19 06:40:21,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2022-11-19 06:40:21,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2022-11-19 06:40:21,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.0625) internal successors, (17), 17 states have internal predecessors, (17), 4 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2022-11-19 06:40:21,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2022-11-19 06:40:21,930 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 39 [2022-11-19 06:40:21,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:40:21,931 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2022-11-19 06:40:21,931 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2022-11-19 06:40:21,931 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2022-11-19 06:40:21,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2022-11-19 06:40:21,932 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:40:21,932 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 5, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:40:21,956 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2022-11-19 06:40:22,132 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:22,133 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:40:22,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:40:22,133 INFO L85 PathProgramCache]: Analyzing trace with hash 735115528, now seen corresponding path program 4 times [2022-11-19 06:40:22,133 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:40:22,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [692471896] [2022-11-19 06:40:22,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:22,134 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:40:22,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:40:22,793 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 4 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 06:40:22,793 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:40:22,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [692471896] [2022-11-19 06:40:22,793 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [692471896] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:40:22,794 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966909052] [2022-11-19 06:40:22,794 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:40:22,794 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:22,794 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:40:22,800 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:40:22,835 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2022-11-19 06:40:22,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:40:22,873 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 60 conjunts are in the unsatisfiable core [2022-11-19 06:40:22,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:40:23,555 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 7 proven. 31 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2022-11-19 06:40:23,555 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:40:25,121 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 9 proven. 37 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2022-11-19 06:40:25,122 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1966909052] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:40:25,122 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [503901891] [2022-11-19 06:40:25,124 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:40:25,124 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:40:25,124 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:40:25,125 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:40:25,126 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 22] total 48 [2022-11-19 06:40:25,126 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068317695] [2022-11-19 06:40:25,126 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:40:25,127 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2022-11-19 06:40:25,127 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:40:25,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2022-11-19 06:40:25,128 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=2063, Unknown=0, NotChecked=0, Total=2256 [2022-11-19 06:40:25,129 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 48 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 34 states have internal predecessors, (66), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (15), 14 states have call predecessors, (15), 12 states have call successors, (15) [2022-11-19 06:40:26,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:40:26,278 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2022-11-19 06:40:26,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-19 06:40:26,278 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 34 states have internal predecessors, (66), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (15), 14 states have call predecessors, (15), 12 states have call successors, (15) Word has length 40 [2022-11-19 06:40:26,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:40:26,280 INFO L225 Difference]: With dead ends: 45 [2022-11-19 06:40:26,280 INFO L226 Difference]: Without dead ends: 39 [2022-11-19 06:40:26,281 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 47 SyntacticMatches, 5 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 870 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=434, Invalid=3472, Unknown=0, NotChecked=0, Total=3906 [2022-11-19 06:40:26,282 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 85 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 729 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 94 SdHoareTripleChecker+Valid, 193 SdHoareTripleChecker+Invalid, 797 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 729 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2022-11-19 06:40:26,282 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [94 Valid, 193 Invalid, 797 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 729 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2022-11-19 06:40:26,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2022-11-19 06:40:26,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 31. [2022-11-19 06:40:26,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 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), 4 states have return successors, (12), 6 states have call predecessors, (12), 5 states have call successors, (12) [2022-11-19 06:40:26,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 40 transitions. [2022-11-19 06:40:26,290 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 40 transitions. Word has length 40 [2022-11-19 06:40:26,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:40:26,291 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 40 transitions. [2022-11-19 06:40:26,291 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 43 states have (on average 1.5348837209302326) internal successors, (66), 34 states have internal predecessors, (66), 12 states have call successors, (12), 1 states have call predecessors, (12), 8 states have return successors, (15), 14 states have call predecessors, (15), 12 states have call successors, (15) [2022-11-19 06:40:26,291 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 40 transitions. [2022-11-19 06:40:26,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-19 06:40:26,292 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:40:26,293 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:40:26,305 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2022-11-19 06:40:26,499 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:26,499 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:40:26,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:40:26,500 INFO L85 PathProgramCache]: Analyzing trace with hash -1490504886, now seen corresponding path program 5 times [2022-11-19 06:40:26,500 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:40:26,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409798053] [2022-11-19 06:40:26,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:26,502 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:40:26,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:40:27,638 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-19 06:40:27,639 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:40:27,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409798053] [2022-11-19 06:40:27,639 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [409798053] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:40:27,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [538975037] [2022-11-19 06:40:27,639 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:40:27,639 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:27,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:40:27,642 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:40:27,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2022-11-19 06:40:27,712 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2022-11-19 06:40:27,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:40:27,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 85 conjunts are in the unsatisfiable core [2022-11-19 06:40:27,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:40:28,663 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 3 proven. 61 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2022-11-19 06:40:28,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:40:31,238 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 20 proven. 80 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-19 06:40:31,239 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [538975037] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:40:31,239 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1843504916] [2022-11-19 06:40:31,242 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:40:31,242 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:40:31,244 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:40:31,244 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:40:31,245 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 16, 24] total 57 [2022-11-19 06:40:31,245 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612624449] [2022-11-19 06:40:31,245 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:40:31,246 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2022-11-19 06:40:31,246 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:40:31,247 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2022-11-19 06:40:31,249 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=2997, Unknown=0, NotChecked=0, Total=3192 [2022-11-19 06:40:31,249 INFO L87 Difference]: Start difference. First operand 31 states and 40 transitions. Second operand has 57 states, 52 states have (on average 1.5) internal successors, (78), 39 states have internal predecessors, (78), 15 states have call successors, (15), 1 states have call predecessors, (15), 12 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19) [2022-11-19 06:40:33,367 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:40:33,367 INFO L93 Difference]: Finished difference Result 56 states and 75 transitions. [2022-11-19 06:40:33,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-19 06:40:33,368 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 52 states have (on average 1.5) internal successors, (78), 39 states have internal predecessors, (78), 15 states have call successors, (15), 1 states have call predecessors, (15), 12 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19) Word has length 54 [2022-11-19 06:40:33,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:40:33,369 INFO L225 Difference]: With dead ends: 56 [2022-11-19 06:40:33,369 INFO L226 Difference]: Without dead ends: 48 [2022-11-19 06:40:33,372 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 74 SyntacticMatches, 6 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1309 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=592, Invalid=5414, Unknown=0, NotChecked=0, Total=6006 [2022-11-19 06:40:33,373 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 170 mSDsluCounter, 259 mSDsCounter, 0 mSdLazyCounter, 1156 mSolverCounterSat, 158 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 1314 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 158 IncrementalHoareTripleChecker+Valid, 1156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:40:33,374 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [174 Valid, 274 Invalid, 1314 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [158 Valid, 1156 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-19 06:40:33,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2022-11-19 06:40:33,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 34. [2022-11-19 06:40:33,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 24 states have internal predecessors, (25), 5 states have call successors, (5), 2 states have call predecessors, (5), 5 states have return successors, (14), 7 states have call predecessors, (14), 5 states have call successors, (14) [2022-11-19 06:40:33,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 44 transitions. [2022-11-19 06:40:33,390 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 44 transitions. Word has length 54 [2022-11-19 06:40:33,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:40:33,390 INFO L495 AbstractCegarLoop]: Abstraction has 34 states and 44 transitions. [2022-11-19 06:40:33,390 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 52 states have (on average 1.5) internal successors, (78), 39 states have internal predecessors, (78), 15 states have call successors, (15), 1 states have call predecessors, (15), 12 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19) [2022-11-19 06:40:33,391 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 44 transitions. [2022-11-19 06:40:33,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2022-11-19 06:40:33,395 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:40:33,395 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 9, 7, 7, 7, 7, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:40:33,405 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2022-11-19 06:40:33,601 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:33,601 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:40:33,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:40:33,601 INFO L85 PathProgramCache]: Analyzing trace with hash -71623192, now seen corresponding path program 6 times [2022-11-19 06:40:33,602 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:40:33,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1536286694] [2022-11-19 06:40:33,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:33,602 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:40:33,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:40:34,989 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2022-11-19 06:40:34,990 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:40:34,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1536286694] [2022-11-19 06:40:34,990 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1536286694] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:40:34,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [772478851] [2022-11-19 06:40:34,991 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:40:34,991 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:34,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:40:34,996 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:40:35,011 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2022-11-19 06:40:35,068 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:40:35,068 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:40:35,071 WARN L261 TraceCheckSpWp]: Trace formula consists of 216 conjuncts, 109 conjunts are in the unsatisfiable core [2022-11-19 06:40:35,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:40:36,313 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 4 proven. 106 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2022-11-19 06:40:36,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:40:40,243 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [772478851] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:40:40,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [745883786] [2022-11-19 06:40:40,246 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:40:40,246 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:40:40,246 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:40:40,247 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:40:40,248 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 18] total 49 [2022-11-19 06:40:40,248 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [472791931] [2022-11-19 06:40:40,248 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:40:40,249 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2022-11-19 06:40:40,249 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:40:40,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2022-11-19 06:40:40,251 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=245, Invalid=4585, Unknown=0, NotChecked=0, Total=4830 [2022-11-19 06:40:40,251 INFO L87 Difference]: Start difference. First operand 34 states and 44 transitions. Second operand has 49 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 34 states have internal predecessors, (64), 11 states have call successors, (11), 1 states have call predecessors, (11), 13 states have return successors, (15), 15 states have call predecessors, (15), 11 states have call successors, (15) [2022-11-19 06:40:41,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:40:41,834 INFO L93 Difference]: Finished difference Result 49 states and 64 transitions. [2022-11-19 06:40:41,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-19 06:40:41,835 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 34 states have internal predecessors, (64), 11 states have call successors, (11), 1 states have call predecessors, (11), 13 states have return successors, (15), 15 states have call predecessors, (15), 11 states have call successors, (15) Word has length 68 [2022-11-19 06:40:41,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:40:41,836 INFO L225 Difference]: With dead ends: 49 [2022-11-19 06:40:41,836 INFO L226 Difference]: Without dead ends: 43 [2022-11-19 06:40:41,838 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 79 SyntacticMatches, 6 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1473 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=614, Invalid=6526, Unknown=0, NotChecked=0, Total=7140 [2022-11-19 06:40:41,839 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 80 mSDsluCounter, 269 mSDsCounter, 0 mSdLazyCounter, 941 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 284 SdHoareTripleChecker+Invalid, 979 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 941 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 06:40:41,840 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [81 Valid, 284 Invalid, 979 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 941 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 06:40:41,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2022-11-19 06:40:41,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 39. [2022-11-19 06:40:41,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 27 states have internal predecessors, (28), 6 states have call successors, (6), 2 states have call predecessors, (6), 6 states have return successors, (20), 9 states have call predecessors, (20), 6 states have call successors, (20) [2022-11-19 06:40:41,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 54 transitions. [2022-11-19 06:40:41,850 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 54 transitions. Word has length 68 [2022-11-19 06:40:41,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:40:41,850 INFO L495 AbstractCegarLoop]: Abstraction has 39 states and 54 transitions. [2022-11-19 06:40:41,850 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 45 states have (on average 1.4222222222222223) internal successors, (64), 34 states have internal predecessors, (64), 11 states have call successors, (11), 1 states have call predecessors, (11), 13 states have return successors, (15), 15 states have call predecessors, (15), 11 states have call successors, (15) [2022-11-19 06:40:41,851 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 54 transitions. [2022-11-19 06:40:41,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2022-11-19 06:40:41,852 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:40:41,852 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 10, 8, 8, 8, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:40:41,864 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2022-11-19 06:40:42,058 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2022-11-19 06:40:42,058 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:40:42,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:40:42,059 INFO L85 PathProgramCache]: Analyzing trace with hash 1265942364, now seen corresponding path program 7 times [2022-11-19 06:40:42,059 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:40:42,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1413523659] [2022-11-19 06:40:42,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:42,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:40:42,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:40:43,791 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 0 proven. 232 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2022-11-19 06:40:43,791 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:40:43,791 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1413523659] [2022-11-19 06:40:43,792 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1413523659] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:40:43,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [259945695] [2022-11-19 06:40:43,792 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:40:43,792 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:43,792 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:40:43,794 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:40:43,796 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2022-11-19 06:40:43,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:40:43,875 WARN L261 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 121 conjunts are in the unsatisfiable core [2022-11-19 06:40:43,879 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:40:45,264 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 5 proven. 134 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2022-11-19 06:40:45,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:40:49,949 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [259945695] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:40:49,949 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [489232450] [2022-11-19 06:40:49,951 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:40:49,951 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:40:49,952 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:40:49,953 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:40:49,953 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 20] total 54 [2022-11-19 06:40:49,953 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572510777] [2022-11-19 06:40:49,953 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:40:49,954 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 54 states [2022-11-19 06:40:49,954 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:40:49,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2022-11-19 06:40:49,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=5583, Unknown=0, NotChecked=0, Total=5852 [2022-11-19 06:40:49,957 INFO L87 Difference]: Start difference. First operand 39 states and 54 transitions. Second operand has 54 states, 50 states have (on average 1.42) internal successors, (71), 37 states have internal predecessors, (71), 12 states have call successors, (12), 1 states have call predecessors, (12), 15 states have return successors, (17), 17 states have call predecessors, (17), 12 states have call successors, (17) [2022-11-19 06:40:51,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:40:51,735 INFO L93 Difference]: Finished difference Result 50 states and 68 transitions. [2022-11-19 06:40:51,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2022-11-19 06:40:51,736 INFO L78 Accepts]: Start accepts. Automaton has has 54 states, 50 states have (on average 1.42) internal successors, (71), 37 states have internal predecessors, (71), 12 states have call successors, (12), 1 states have call predecessors, (12), 15 states have return successors, (17), 17 states have call predecessors, (17), 12 states have call successors, (17) Word has length 75 [2022-11-19 06:40:51,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:40:51,739 INFO L225 Difference]: With dead ends: 50 [2022-11-19 06:40:51,739 INFO L226 Difference]: Without dead ends: 46 [2022-11-19 06:40:51,752 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 88 SyntacticMatches, 7 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1743 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=713, Invalid=7659, Unknown=0, NotChecked=0, Total=8372 [2022-11-19 06:40:51,753 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 112 mSDsluCounter, 350 mSDsCounter, 0 mSdLazyCounter, 1176 mSolverCounterSat, 50 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 1226 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 50 IncrementalHoareTripleChecker+Valid, 1176 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-19 06:40:51,753 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [113 Valid, 366 Invalid, 1226 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [50 Valid, 1176 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-19 06:40:51,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2022-11-19 06:40:51,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2022-11-19 06:40:51,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 28 states have (on average 1.0714285714285714) internal successors, (30), 29 states have internal predecessors, (30), 6 states have call successors, (6), 2 states have call predecessors, (6), 7 states have return successors, (25), 10 states have call predecessors, (25), 6 states have call successors, (25) [2022-11-19 06:40:51,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 61 transitions. [2022-11-19 06:40:51,773 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 61 transitions. Word has length 75 [2022-11-19 06:40:51,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:40:51,773 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 61 transitions. [2022-11-19 06:40:51,774 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 54 states, 50 states have (on average 1.42) internal successors, (71), 37 states have internal predecessors, (71), 12 states have call successors, (12), 1 states have call predecessors, (12), 15 states have return successors, (17), 17 states have call predecessors, (17), 12 states have call successors, (17) [2022-11-19 06:40:51,774 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 61 transitions. [2022-11-19 06:40:51,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-19 06:40:51,776 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:40:51,776 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 6, 6, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:40:51,786 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2022-11-19 06:40:51,986 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:51,987 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:40:51,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:40:51,987 INFO L85 PathProgramCache]: Analyzing trace with hash -87767316, now seen corresponding path program 8 times [2022-11-19 06:40:51,987 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:40:51,987 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1861080059] [2022-11-19 06:40:51,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:40:51,988 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:40:52,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:40:52,951 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 4 proven. 138 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-19 06:40:52,951 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:40:52,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1861080059] [2022-11-19 06:40:52,952 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1861080059] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:40:52,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [105145278] [2022-11-19 06:40:52,952 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:40:52,952 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:40:52,952 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:40:52,953 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:40:52,957 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2022-11-19 06:40:53,057 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2022-11-19 06:40:53,058 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:40:53,060 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 93 conjunts are in the unsatisfiable core [2022-11-19 06:40:53,063 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:40:54,085 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 32 proven. 80 refuted. 0 times theorem prover too weak. 58 trivial. 0 not checked. [2022-11-19 06:40:54,085 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:40:57,176 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 8 proven. 134 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2022-11-19 06:40:57,177 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [105145278] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:40:57,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [274450464] [2022-11-19 06:40:57,179 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:40:57,179 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:40:57,179 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:40:57,180 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:40:57,181 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 25, 29] total 73 [2022-11-19 06:40:57,181 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1666689114] [2022-11-19 06:40:57,181 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:40:57,182 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2022-11-19 06:40:57,182 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:40:57,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2022-11-19 06:40:57,184 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=5006, Unknown=0, NotChecked=0, Total=5256 [2022-11-19 06:40:57,184 INFO L87 Difference]: Start difference. First operand 42 states and 61 transitions. Second operand has 73 states, 70 states have (on average 1.5285714285714285) internal successors, (107), 49 states have internal predecessors, (107), 18 states have call successors, (18), 1 states have call predecessors, (18), 20 states have return successors, (24), 24 states have call predecessors, (24), 18 states have call successors, (24) [2022-11-19 06:41:00,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:41:00,469 INFO L93 Difference]: Finished difference Result 89 states and 122 transitions. [2022-11-19 06:41:00,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-19 06:41:00,470 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 70 states have (on average 1.5285714285714285) internal successors, (107), 49 states have internal predecessors, (107), 18 states have call successors, (18), 1 states have call predecessors, (18), 20 states have return successors, (24), 24 states have call predecessors, (24), 18 states have call successors, (24) Word has length 61 [2022-11-19 06:41:00,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:41:00,472 INFO L225 Difference]: With dead ends: 89 [2022-11-19 06:41:00,472 INFO L226 Difference]: Without dead ends: 81 [2022-11-19 06:41:00,475 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 75 SyntacticMatches, 3 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2170 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=990, Invalid=9722, Unknown=0, NotChecked=0, Total=10712 [2022-11-19 06:41:00,476 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 155 mSDsluCounter, 568 mSDsCounter, 0 mSdLazyCounter, 2177 mSolverCounterSat, 169 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 588 SdHoareTripleChecker+Invalid, 2346 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 169 IncrementalHoareTripleChecker+Valid, 2177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-19 06:41:00,476 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [161 Valid, 588 Invalid, 2346 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [169 Valid, 2177 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-19 06:41:00,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2022-11-19 06:41:00,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 69. [2022-11-19 06:41:00,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 46 states have (on average 1.0869565217391304) internal successors, (50), 47 states have internal predecessors, (50), 10 states have call successors, (10), 4 states have call predecessors, (10), 12 states have return successors, (39), 17 states have call predecessors, (39), 10 states have call successors, (39) [2022-11-19 06:41:00,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 99 transitions. [2022-11-19 06:41:00,492 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 99 transitions. Word has length 61 [2022-11-19 06:41:00,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:41:00,493 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 99 transitions. [2022-11-19 06:41:00,493 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 70 states have (on average 1.5285714285714285) internal successors, (107), 49 states have internal predecessors, (107), 18 states have call successors, (18), 1 states have call predecessors, (18), 20 states have return successors, (24), 24 states have call predecessors, (24), 18 states have call successors, (24) [2022-11-19 06:41:00,493 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 99 transitions. [2022-11-19 06:41:00,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-19 06:41:00,494 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:41:00,495 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 9, 9, 9, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:41:00,504 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2022-11-19 06:41:00,700 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:00,700 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:41:00,701 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:41:00,701 INFO L85 PathProgramCache]: Analyzing trace with hash 510736696, now seen corresponding path program 9 times [2022-11-19 06:41:00,701 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:41:00,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1461305883] [2022-11-19 06:41:00,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:00,701 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:41:00,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:41:02,441 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 1 proven. 287 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-11-19 06:41:02,441 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:41:02,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1461305883] [2022-11-19 06:41:02,441 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1461305883] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:41:02,441 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1515431811] [2022-11-19 06:41:02,442 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:41:02,442 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:02,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:41:02,444 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:41:02,467 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2022-11-19 06:41:02,547 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:41:02,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:41:02,551 WARN L261 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 133 conjunts are in the unsatisfiable core [2022-11-19 06:41:02,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:41:04,029 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 6 proven. 165 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2022-11-19 06:41:04,029 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:41:11,550 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 35 proven. 253 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-11-19 06:41:11,550 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1515431811] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:41:11,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1178750940] [2022-11-19 06:41:11,552 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:41:11,553 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:41:11,553 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:41:11,554 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:41:11,554 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 22, 37] total 85 [2022-11-19 06:41:11,554 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173044908] [2022-11-19 06:41:11,555 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:41:11,555 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2022-11-19 06:41:11,555 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:41:11,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2022-11-19 06:41:11,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=6838, Unknown=3, NotChecked=0, Total=7140 [2022-11-19 06:41:11,558 INFO L87 Difference]: Start difference. First operand 69 states and 99 transitions. Second operand has 85 states, 79 states have (on average 1.5316455696202531) internal successors, (121), 56 states have internal predecessors, (121), 23 states have call successors, (23), 1 states have call predecessors, (23), 20 states have return successors, (30), 29 states have call predecessors, (30), 23 states have call successors, (30) [2022-11-19 06:41:14,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:41:14,975 INFO L93 Difference]: Finished difference Result 90 states and 132 transitions. [2022-11-19 06:41:14,975 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2022-11-19 06:41:14,976 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 79 states have (on average 1.5316455696202531) internal successors, (121), 56 states have internal predecessors, (121), 23 states have call successors, (23), 1 states have call predecessors, (23), 20 states have return successors, (30), 29 states have call predecessors, (30), 23 states have call successors, (30) Word has length 82 [2022-11-19 06:41:14,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:41:14,977 INFO L225 Difference]: With dead ends: 90 [2022-11-19 06:41:14,978 INFO L226 Difference]: Without dead ends: 84 [2022-11-19 06:41:14,979 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 112 SyntacticMatches, 9 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2683 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=1012, Invalid=10975, Unknown=3, NotChecked=0, Total=11990 [2022-11-19 06:41:14,980 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 219 mSDsluCounter, 546 mSDsCounter, 0 mSdLazyCounter, 2332 mSolverCounterSat, 167 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 223 SdHoareTripleChecker+Valid, 564 SdHoareTripleChecker+Invalid, 2545 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 167 IncrementalHoareTripleChecker+Valid, 2332 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 46 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-11-19 06:41:14,980 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [223 Valid, 564 Invalid, 2545 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [167 Valid, 2332 Invalid, 0 Unknown, 46 Unchecked, 1.8s Time] [2022-11-19 06:41:14,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-11-19 06:41:14,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 76. [2022-11-19 06:41:14,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 51 states have (on average 1.0980392156862746) internal successors, (56), 52 states have internal predecessors, (56), 11 states have call successors, (11), 5 states have call predecessors, (11), 13 states have return successors, (41), 18 states have call predecessors, (41), 11 states have call successors, (41) [2022-11-19 06:41:14,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 108 transitions. [2022-11-19 06:41:14,997 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 108 transitions. Word has length 82 [2022-11-19 06:41:14,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:41:14,998 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 108 transitions. [2022-11-19 06:41:14,998 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 79 states have (on average 1.5316455696202531) internal successors, (121), 56 states have internal predecessors, (121), 23 states have call successors, (23), 1 states have call predecessors, (23), 20 states have return successors, (30), 29 states have call predecessors, (30), 23 states have call successors, (30) [2022-11-19 06:41:14,999 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 108 transitions. [2022-11-19 06:41:15,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2022-11-19 06:41:15,000 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:41:15,000 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 8, 6, 6, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:41:15,006 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2022-11-19 06:41:15,206 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2022-11-19 06:41:15,206 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:41:15,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:41:15,207 INFO L85 PathProgramCache]: Analyzing trace with hash 834620298, now seen corresponding path program 10 times [2022-11-19 06:41:15,207 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:41:15,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [491337716] [2022-11-19 06:41:15,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:15,207 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:41:15,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:41:16,351 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 1 proven. 137 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-19 06:41:16,352 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:41:16,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [491337716] [2022-11-19 06:41:16,352 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [491337716] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:41:16,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [816992415] [2022-11-19 06:41:16,352 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:41:16,353 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:16,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:41:16,354 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:41:16,358 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2022-11-19 06:41:16,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:41:16,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 97 conjunts are in the unsatisfiable core [2022-11-19 06:41:16,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:41:17,465 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 4 proven. 83 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2022-11-19 06:41:17,466 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:41:20,355 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 23 proven. 115 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2022-11-19 06:41:20,356 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [816992415] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:41:20,356 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [305050715] [2022-11-19 06:41:20,358 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:41:20,358 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:41:20,358 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:41:20,359 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:41:20,359 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 18, 27] total 64 [2022-11-19 06:41:20,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050064252] [2022-11-19 06:41:20,360 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:41:20,360 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2022-11-19 06:41:20,360 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:41:20,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2022-11-19 06:41:20,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=3808, Unknown=0, NotChecked=0, Total=4032 [2022-11-19 06:41:20,362 INFO L87 Difference]: Start difference. First operand 76 states and 108 transitions. Second operand has 64 states, 59 states have (on average 1.5084745762711864) internal successors, (89), 43 states have internal predecessors, (89), 17 states have call successors, (17), 1 states have call predecessors, (17), 14 states have return successors, (22), 21 states have call predecessors, (22), 17 states have call successors, (22) [2022-11-19 06:41:22,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:41:22,373 INFO L93 Difference]: Finished difference Result 90 states and 119 transitions. [2022-11-19 06:41:22,373 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-19 06:41:22,373 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 59 states have (on average 1.5084745762711864) internal successors, (89), 43 states have internal predecessors, (89), 17 states have call successors, (17), 1 states have call predecessors, (17), 14 states have return successors, (22), 21 states have call predecessors, (22), 17 states have call successors, (22) Word has length 61 [2022-11-19 06:41:22,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:41:22,375 INFO L225 Difference]: With dead ends: 90 [2022-11-19 06:41:22,375 INFO L226 Difference]: Without dead ends: 84 [2022-11-19 06:41:22,376 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 83 SyntacticMatches, 7 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1620 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=692, Invalid=6448, Unknown=0, NotChecked=0, Total=7140 [2022-11-19 06:41:22,377 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 100 mSDsluCounter, 347 mSDsCounter, 0 mSdLazyCounter, 1219 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 104 SdHoareTripleChecker+Valid, 364 SdHoareTripleChecker+Invalid, 1282 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 1219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2022-11-19 06:41:22,377 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [104 Valid, 364 Invalid, 1282 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 1219 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2022-11-19 06:41:22,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2022-11-19 06:41:22,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 70. [2022-11-19 06:41:22,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 48 states have internal predecessors, (51), 9 states have call successors, (9), 4 states have call predecessors, (9), 13 states have return successors, (34), 17 states have call predecessors, (34), 9 states have call successors, (34) [2022-11-19 06:41:22,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 94 transitions. [2022-11-19 06:41:22,396 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 94 transitions. Word has length 61 [2022-11-19 06:41:22,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:41:22,397 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 94 transitions. [2022-11-19 06:41:22,397 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 59 states have (on average 1.5084745762711864) internal successors, (89), 43 states have internal predecessors, (89), 17 states have call successors, (17), 1 states have call predecessors, (17), 14 states have return successors, (22), 21 states have call predecessors, (22), 17 states have call successors, (22) [2022-11-19 06:41:22,398 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 94 transitions. [2022-11-19 06:41:22,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2022-11-19 06:41:22,399 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:41:22,399 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 7, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:41:22,409 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2022-11-19 06:41:22,605 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2022-11-19 06:41:22,605 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:41:22,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:41:22,605 INFO L85 PathProgramCache]: Analyzing trace with hash 1966394026, now seen corresponding path program 11 times [2022-11-19 06:41:22,606 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:41:22,606 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1124123900] [2022-11-19 06:41:22,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:22,606 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:41:22,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:41:23,388 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 2 proven. 98 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2022-11-19 06:41:23,389 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:41:23,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1124123900] [2022-11-19 06:41:23,389 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1124123900] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:41:23,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1928065278] [2022-11-19 06:41:23,389 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:41:23,389 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:23,390 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:41:23,391 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:41:23,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2022-11-19 06:41:23,500 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2022-11-19 06:41:23,500 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:41:23,503 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 81 conjunts are in the unsatisfiable core [2022-11-19 06:41:23,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:41:24,265 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 86 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2022-11-19 06:41:24,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:41:25,968 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 104 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2022-11-19 06:41:25,968 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1928065278] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:41:25,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1117602877] [2022-11-19 06:41:25,970 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:41:25,970 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:41:25,970 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:41:25,971 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:41:25,972 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 22, 25] total 61 [2022-11-19 06:41:25,972 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1497607016] [2022-11-19 06:41:25,972 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:41:25,972 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2022-11-19 06:41:25,973 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:41:25,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2022-11-19 06:41:25,974 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=3434, Unknown=0, NotChecked=0, Total=3660 [2022-11-19 06:41:25,974 INFO L87 Difference]: Start difference. First operand 70 states and 94 transitions. Second operand has 61 states, 57 states have (on average 1.5789473684210527) internal successors, (90), 40 states have internal predecessors, (90), 16 states have call successors, (16), 1 states have call predecessors, (16), 14 states have return successors, (21), 21 states have call predecessors, (21), 16 states have call successors, (21) [2022-11-19 06:41:27,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:41:27,494 INFO L93 Difference]: Finished difference Result 86 states and 119 transitions. [2022-11-19 06:41:27,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2022-11-19 06:41:27,494 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 57 states have (on average 1.5789473684210527) internal successors, (90), 40 states have internal predecessors, (90), 16 states have call successors, (16), 1 states have call predecessors, (16), 14 states have return successors, (21), 21 states have call predecessors, (21), 16 states have call successors, (21) Word has length 54 [2022-11-19 06:41:27,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:41:27,496 INFO L225 Difference]: With dead ends: 86 [2022-11-19 06:41:27,496 INFO L226 Difference]: Without dead ends: 80 [2022-11-19 06:41:27,497 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1428 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=642, Invalid=5838, Unknown=0, NotChecked=0, Total=6480 [2022-11-19 06:41:27,498 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 88 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 1113 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 271 SdHoareTripleChecker+Invalid, 1183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 1113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2022-11-19 06:41:27,498 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [91 Valid, 271 Invalid, 1183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 1113 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2022-11-19 06:41:27,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2022-11-19 06:41:27,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 70. [2022-11-19 06:41:27,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 47 states have (on average 1.0851063829787233) internal successors, (51), 48 states have internal predecessors, (51), 9 states have call successors, (9), 4 states have call predecessors, (9), 13 states have return successors, (32), 17 states have call predecessors, (32), 9 states have call successors, (32) [2022-11-19 06:41:27,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 92 transitions. [2022-11-19 06:41:27,521 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 92 transitions. Word has length 54 [2022-11-19 06:41:27,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:41:27,522 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 92 transitions. [2022-11-19 06:41:27,522 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 57 states have (on average 1.5789473684210527) internal successors, (90), 40 states have internal predecessors, (90), 16 states have call successors, (16), 1 states have call predecessors, (16), 14 states have return successors, (21), 21 states have call predecessors, (21), 16 states have call successors, (21) [2022-11-19 06:41:27,522 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 92 transitions. [2022-11-19 06:41:27,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2022-11-19 06:41:27,523 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:41:27,524 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 11, 9, 9, 9, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:41:27,529 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2022-11-19 06:41:27,729 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:27,729 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:41:27,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:41:27,730 INFO L85 PathProgramCache]: Analyzing trace with hash -1392852054, now seen corresponding path program 12 times [2022-11-19 06:41:27,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:41:27,730 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [874202] [2022-11-19 06:41:27,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:27,730 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:41:27,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:41:29,556 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 0 proven. 288 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-11-19 06:41:29,557 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:41:29,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [874202] [2022-11-19 06:41:29,557 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [874202] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:41:29,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [201276179] [2022-11-19 06:41:29,557 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:41:29,557 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:29,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:41:29,560 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:41:29,562 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2022-11-19 06:41:29,665 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:41:29,665 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:41:29,668 WARN L261 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 133 conjunts are in the unsatisfiable core [2022-11-19 06:41:29,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:41:31,354 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 167 refuted. 0 times theorem prover too weak. 173 trivial. 0 not checked. [2022-11-19 06:41:31,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:41:36,289 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 32 proven. 256 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2022-11-19 06:41:36,290 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [201276179] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:41:36,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1602499571] [2022-11-19 06:41:36,291 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:41:36,292 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:41:36,292 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:41:36,296 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:41:36,296 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 24, 36] total 85 [2022-11-19 06:41:36,296 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484759071] [2022-11-19 06:41:36,296 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:41:36,300 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 85 states [2022-11-19 06:41:36,300 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:41:36,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 85 interpolants. [2022-11-19 06:41:36,302 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=291, Invalid=6849, Unknown=0, NotChecked=0, Total=7140 [2022-11-19 06:41:36,304 INFO L87 Difference]: Start difference. First operand 70 states and 92 transitions. Second operand has 85 states, 80 states have (on average 1.525) internal successors, (122), 55 states have internal predecessors, (122), 23 states have call successors, (23), 1 states have call predecessors, (23), 20 states have return successors, (31), 30 states have call predecessors, (31), 23 states have call successors, (31) [2022-11-19 06:41:39,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:41:39,483 INFO L93 Difference]: Finished difference Result 93 states and 126 transitions. [2022-11-19 06:41:39,483 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2022-11-19 06:41:39,483 INFO L78 Accepts]: Start accepts. Automaton has has 85 states, 80 states have (on average 1.525) internal successors, (122), 55 states have internal predecessors, (122), 23 states have call successors, (23), 1 states have call predecessors, (23), 20 states have return successors, (31), 30 states have call predecessors, (31), 23 states have call successors, (31) Word has length 82 [2022-11-19 06:41:39,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:41:39,485 INFO L225 Difference]: With dead ends: 93 [2022-11-19 06:41:39,485 INFO L226 Difference]: Without dead ends: 87 [2022-11-19 06:41:39,487 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 110 SyntacticMatches, 10 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2792 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=1074, Invalid=11358, Unknown=0, NotChecked=0, Total=12432 [2022-11-19 06:41:39,488 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 209 mSDsluCounter, 609 mSDsCounter, 0 mSdLazyCounter, 2198 mSolverCounterSat, 138 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 629 SdHoareTripleChecker+Invalid, 2336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 138 IncrementalHoareTripleChecker+Valid, 2198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-19 06:41:39,488 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [212 Valid, 629 Invalid, 2336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [138 Valid, 2198 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-19 06:41:39,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2022-11-19 06:41:39,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 73. [2022-11-19 06:41:39,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 49 states have (on average 1.0816326530612246) internal successors, (53), 50 states have internal predecessors, (53), 9 states have call successors, (9), 4 states have call predecessors, (9), 14 states have return successors, (35), 18 states have call predecessors, (35), 9 states have call successors, (35) [2022-11-19 06:41:39,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 97 transitions. [2022-11-19 06:41:39,503 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 97 transitions. Word has length 82 [2022-11-19 06:41:39,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:41:39,504 INFO L495 AbstractCegarLoop]: Abstraction has 73 states and 97 transitions. [2022-11-19 06:41:39,504 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 85 states, 80 states have (on average 1.525) internal successors, (122), 55 states have internal predecessors, (122), 23 states have call successors, (23), 1 states have call predecessors, (23), 20 states have return successors, (31), 30 states have call predecessors, (31), 23 states have call successors, (31) [2022-11-19 06:41:39,504 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 97 transitions. [2022-11-19 06:41:39,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2022-11-19 06:41:39,505 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:41:39,506 INFO L195 NwaCegarLoop]: trace histogram [12, 12, 12, 10, 10, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:41:39,515 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2022-11-19 06:41:39,711 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2022-11-19 06:41:39,711 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:41:39,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:41:39,712 INFO L85 PathProgramCache]: Analyzing trace with hash 1149449002, now seen corresponding path program 13 times [2022-11-19 06:41:39,712 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:41:39,712 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [560474841] [2022-11-19 06:41:39,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:39,712 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:41:39,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:41:41,890 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 350 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-19 06:41:41,890 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:41:41,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [560474841] [2022-11-19 06:41:41,891 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [560474841] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:41:41,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [605745384] [2022-11-19 06:41:41,891 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:41:41,891 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:41,891 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:41:41,892 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:41:41,915 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2022-11-19 06:41:42,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:41:42,029 WARN L261 TraceCheckSpWp]: Trace formula consists of 273 conjuncts, 145 conjunts are in the unsatisfiable core [2022-11-19 06:41:42,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:41:43,943 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 8 proven. 201 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2022-11-19 06:41:43,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:41:49,876 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 35 proven. 315 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2022-11-19 06:41:49,876 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [605745384] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:41:49,876 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2074464672] [2022-11-19 06:41:49,878 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:41:49,878 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:41:49,879 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:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:41:49,880 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:41:49,880 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 26, 39] total 92 [2022-11-19 06:41:49,880 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223350653] [2022-11-19 06:41:49,880 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:41:49,881 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 92 states [2022-11-19 06:41:49,881 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:41:49,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 92 interpolants. [2022-11-19 06:41:49,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=315, Invalid=8057, Unknown=0, NotChecked=0, Total=8372 [2022-11-19 06:41:49,883 INFO L87 Difference]: Start difference. First operand 73 states and 97 transitions. Second operand has 92 states, 87 states have (on average 1.528735632183908) internal successors, (133), 59 states have internal predecessors, (133), 25 states have call successors, (25), 1 states have call predecessors, (25), 22 states have return successors, (34), 33 states have call predecessors, (34), 25 states have call successors, (34) [2022-11-19 06:41:53,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:41:53,534 INFO L93 Difference]: Finished difference Result 96 states and 131 transitions. [2022-11-19 06:41:53,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2022-11-19 06:41:53,534 INFO L78 Accepts]: Start accepts. Automaton has has 92 states, 87 states have (on average 1.528735632183908) internal successors, (133), 59 states have internal predecessors, (133), 25 states have call successors, (25), 1 states have call predecessors, (25), 22 states have return successors, (34), 33 states have call predecessors, (34), 25 states have call successors, (34) Word has length 89 [2022-11-19 06:41:53,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:41:53,536 INFO L225 Difference]: With dead ends: 96 [2022-11-19 06:41:53,536 INFO L226 Difference]: Without dead ends: 90 [2022-11-19 06:41:53,537 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 119 SyntacticMatches, 11 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3281 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=1219, Invalid=13301, Unknown=0, NotChecked=0, Total=14520 [2022-11-19 06:41:53,538 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 260 mSDsluCounter, 828 mSDsCounter, 0 mSdLazyCounter, 2735 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 851 SdHoareTripleChecker+Invalid, 2884 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 2735 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2022-11-19 06:41:53,538 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [262 Valid, 851 Invalid, 2884 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 2735 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2022-11-19 06:41:53,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-11-19 06:41:53,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 76. [2022-11-19 06:41:53,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 52 states have internal predecessors, (55), 9 states have call successors, (9), 4 states have call predecessors, (9), 15 states have return successors, (38), 19 states have call predecessors, (38), 9 states have call successors, (38) [2022-11-19 06:41:53,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 102 transitions. [2022-11-19 06:41:53,556 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 102 transitions. Word has length 89 [2022-11-19 06:41:53,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:41:53,556 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 102 transitions. [2022-11-19 06:41:53,557 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 92 states, 87 states have (on average 1.528735632183908) internal successors, (133), 59 states have internal predecessors, (133), 25 states have call successors, (25), 1 states have call predecessors, (25), 22 states have return successors, (34), 33 states have call predecessors, (34), 25 states have call successors, (34) [2022-11-19 06:41:53,557 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 102 transitions. [2022-11-19 06:41:53,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-11-19 06:41:53,567 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:41:53,567 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 11, 11, 11, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:41:53,576 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2022-11-19 06:41:53,773 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2022-11-19 06:41:53,773 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:41:53,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:41:53,774 INFO L85 PathProgramCache]: Analyzing trace with hash -545950054, now seen corresponding path program 14 times [2022-11-19 06:41:53,774 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:41:53,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908859209] [2022-11-19 06:41:53,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:41:53,774 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:41:53,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:41:56,107 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 0 proven. 418 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2022-11-19 06:41:56,107 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:41:56,107 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908859209] [2022-11-19 06:41:56,108 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1908859209] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:41:56,108 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1895164851] [2022-11-19 06:41:56,108 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:41:56,108 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:41:56,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:41:56,109 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:41:56,111 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2022-11-19 06:41:56,240 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2022-11-19 06:41:56,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:41:56,244 WARN L261 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 157 conjunts are in the unsatisfiable core [2022-11-19 06:41:56,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:41:57,969 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 5 proven. 233 refuted. 0 times theorem prover too weak. 262 trivial. 0 not checked. [2022-11-19 06:41:57,969 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:42:03,347 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1895164851] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:42:03,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1560852148] [2022-11-19 06:42:03,349 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:42:03,349 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:42:03,350 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:42:03,351 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:42:03,351 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 22] total 65 [2022-11-19 06:42:03,351 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651464023] [2022-11-19 06:42:03,351 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:42:03,352 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2022-11-19 06:42:03,352 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:42:03,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2022-11-19 06:42:03,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=7347, Unknown=0, NotChecked=0, Total=7656 [2022-11-19 06:42:03,354 INFO L87 Difference]: Start difference. First operand 76 states and 102 transitions. Second operand has 65 states, 61 states have (on average 1.4426229508196722) internal successors, (88), 44 states have internal predecessors, (88), 15 states have call successors, (15), 1 states have call predecessors, (15), 19 states have return successors, (21), 21 states have call predecessors, (21), 15 states have call successors, (21) [2022-11-19 06:42:05,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:42:05,258 INFO L93 Difference]: Finished difference Result 86 states and 112 transitions. [2022-11-19 06:42:05,258 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2022-11-19 06:42:05,258 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 61 states have (on average 1.4426229508196722) internal successors, (88), 44 states have internal predecessors, (88), 15 states have call successors, (15), 1 states have call predecessors, (15), 19 states have return successors, (21), 21 states have call predecessors, (21), 15 states have call successors, (21) Word has length 96 [2022-11-19 06:42:05,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:42:05,260 INFO L225 Difference]: With dead ends: 86 [2022-11-19 06:42:05,260 INFO L226 Difference]: Without dead ends: 82 [2022-11-19 06:42:05,261 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 107 SyntacticMatches, 7 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1973 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=868, Invalid=10052, Unknown=0, NotChecked=0, Total=10920 [2022-11-19 06:42:05,262 INFO L413 NwaCegarLoop]: 18 mSDtfsCounter, 108 mSDsluCounter, 471 mSDsCounter, 0 mSdLazyCounter, 1257 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 489 SdHoareTripleChecker+Invalid, 1305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 1257 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2022-11-19 06:42:05,262 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [110 Valid, 489 Invalid, 1305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 1257 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2022-11-19 06:42:05,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2022-11-19 06:42:05,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 76. [2022-11-19 06:42:05,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 51 states have (on average 1.0784313725490196) internal successors, (55), 52 states have internal predecessors, (55), 9 states have call successors, (9), 4 states have call predecessors, (9), 15 states have return successors, (38), 19 states have call predecessors, (38), 9 states have call successors, (38) [2022-11-19 06:42:05,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 102 transitions. [2022-11-19 06:42:05,279 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 102 transitions. Word has length 96 [2022-11-19 06:42:05,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:42:05,280 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 102 transitions. [2022-11-19 06:42:05,280 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 61 states have (on average 1.4426229508196722) internal successors, (88), 44 states have internal predecessors, (88), 15 states have call successors, (15), 1 states have call predecessors, (15), 19 states have return successors, (21), 21 states have call predecessors, (21), 15 states have call successors, (21) [2022-11-19 06:42:05,280 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 102 transitions. [2022-11-19 06:42:05,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-11-19 06:42:05,282 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:42:05,282 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 16, 14, 14, 14, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:42:05,292 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2022-11-19 06:42:05,488 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2022-11-19 06:42:05,488 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:42:05,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:42:05,489 INFO L85 PathProgramCache]: Analyzing trace with hash -663953108, now seen corresponding path program 15 times [2022-11-19 06:42:05,489 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:42:05,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468651675] [2022-11-19 06:42:05,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:42:05,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:42:05,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:42:08,589 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 658 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-11-19 06:42:08,589 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:42:08,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468651675] [2022-11-19 06:42:08,589 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [468651675] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:42:08,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1190752722] [2022-11-19 06:42:08,589 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:42:08,589 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:42:08,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:42:08,596 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:42:08,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2022-11-19 06:42:08,736 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:42:08,736 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:42:08,747 WARN L261 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 193 conjunts are in the unsatisfiable core [2022-11-19 06:42:08,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:42:11,281 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 9 proven. 361 refuted. 0 times theorem prover too weak. 412 trivial. 0 not checked. [2022-11-19 06:42:11,282 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:42:20,087 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1190752722] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:42:20,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1542562262] [2022-11-19 06:42:20,089 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:42:20,089 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:42:20,089 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:42:20,090 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:42:20,090 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 28] total 80 [2022-11-19 06:42:20,090 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932509370] [2022-11-19 06:42:20,091 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:42:20,091 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2022-11-19 06:42:20,091 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:42:20,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2022-11-19 06:42:20,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=389, Invalid=11821, Unknown=0, NotChecked=0, Total=12210 [2022-11-19 06:42:20,094 INFO L87 Difference]: Start difference. First operand 76 states and 102 transitions. Second operand has 80 states, 76 states have (on average 1.4342105263157894) internal successors, (109), 53 states have internal predecessors, (109), 18 states have call successors, (18), 1 states have call predecessors, (18), 25 states have return successors, (27), 27 states have call predecessors, (27), 18 states have call successors, (27) [2022-11-19 06:42:23,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:42:23,221 INFO L93 Difference]: Finished difference Result 89 states and 123 transitions. [2022-11-19 06:42:23,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-19 06:42:23,222 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 76 states have (on average 1.4342105263157894) internal successors, (109), 53 states have internal predecessors, (109), 18 states have call successors, (18), 1 states have call predecessors, (18), 25 states have return successors, (27), 27 states have call predecessors, (27), 18 states have call successors, (27) Word has length 117 [2022-11-19 06:42:23,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:42:23,223 INFO L225 Difference]: With dead ends: 89 [2022-11-19 06:42:23,223 INFO L226 Difference]: Without dead ends: 85 [2022-11-19 06:42:23,225 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 138 SyntacticMatches, 11 SemanticMatches, 132 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3537 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=1315, Invalid=16507, Unknown=0, NotChecked=0, Total=17822 [2022-11-19 06:42:23,226 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 359 mSDsluCounter, 857 mSDsCounter, 0 mSdLazyCounter, 2216 mSolverCounterSat, 176 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 360 SdHoareTripleChecker+Valid, 880 SdHoareTripleChecker+Invalid, 2392 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 176 IncrementalHoareTripleChecker+Valid, 2216 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-19 06:42:23,226 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [360 Valid, 880 Invalid, 2392 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [176 Valid, 2216 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-19 06:42:23,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-11-19 06:42:23,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 81. [2022-11-19 06:42:23,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 54 states have (on average 1.0740740740740742) internal successors, (58), 55 states have internal predecessors, (58), 10 states have call successors, (10), 4 states have call predecessors, (10), 16 states have return successors, (48), 21 states have call predecessors, (48), 10 states have call successors, (48) [2022-11-19 06:42:23,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 116 transitions. [2022-11-19 06:42:23,241 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 116 transitions. Word has length 117 [2022-11-19 06:42:23,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:42:23,241 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 116 transitions. [2022-11-19 06:42:23,241 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 76 states have (on average 1.4342105263157894) internal successors, (109), 53 states have internal predecessors, (109), 18 states have call successors, (18), 1 states have call predecessors, (18), 25 states have return successors, (27), 27 states have call predecessors, (27), 18 states have call successors, (27) [2022-11-19 06:42:23,242 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 116 transitions. [2022-11-19 06:42:23,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-19 06:42:23,243 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:42:23,243 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 17, 15, 15, 15, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:42:23,255 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2022-11-19 06:42:23,450 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2022-11-19 06:42:23,451 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:42:23,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:42:23,451 INFO L85 PathProgramCache]: Analyzing trace with hash -1625676038, now seen corresponding path program 16 times [2022-11-19 06:42:23,451 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:42:23,451 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [816002948] [2022-11-19 06:42:23,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:42:23,451 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:42:23,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:42:26,934 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 0 proven. 744 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2022-11-19 06:42:26,934 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:42:26,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [816002948] [2022-11-19 06:42:26,934 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [816002948] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:42:26,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [918500012] [2022-11-19 06:42:26,934 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:42:26,935 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:42:26,935 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:42:26,940 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:42:26,944 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2022-11-19 06:42:27,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:42:27,093 WARN L261 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 205 conjunts are in the unsatisfiable core [2022-11-19 06:42:27,107 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:42:29,685 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 9 proven. 408 refuted. 0 times theorem prover too weak. 473 trivial. 0 not checked. [2022-11-19 06:42:29,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:42:38,536 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [918500012] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:42:38,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [667869091] [2022-11-19 06:42:38,538 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:42:38,538 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:42:38,538 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:42:38,538 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:42:38,539 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 28] total 81 [2022-11-19 06:42:38,539 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [306972231] [2022-11-19 06:42:38,539 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:42:38,539 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 81 states [2022-11-19 06:42:38,540 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:42:38,540 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 81 interpolants. [2022-11-19 06:42:38,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=12037, Unknown=0, NotChecked=0, Total=12432 [2022-11-19 06:42:38,542 INFO L87 Difference]: Start difference. First operand 81 states and 116 transitions. Second operand has 81 states, 77 states have (on average 1.4025974025974026) internal successors, (108), 53 states have internal predecessors, (108), 17 states have call successors, (17), 1 states have call predecessors, (17), 26 states have return successors, (28), 28 states have call predecessors, (28), 17 states have call successors, (28) [2022-11-19 06:42:41,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:42:41,731 INFO L93 Difference]: Finished difference Result 89 states and 122 transitions. [2022-11-19 06:42:41,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-19 06:42:41,732 INFO L78 Accepts]: Start accepts. Automaton has has 81 states, 77 states have (on average 1.4025974025974026) internal successors, (108), 53 states have internal predecessors, (108), 17 states have call successors, (17), 1 states have call predecessors, (17), 26 states have return successors, (28), 28 states have call predecessors, (28), 17 states have call successors, (28) Word has length 124 [2022-11-19 06:42:41,732 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:42:41,733 INFO L225 Difference]: With dead ends: 89 [2022-11-19 06:42:41,734 INFO L226 Difference]: Without dead ends: 85 [2022-11-19 06:42:41,735 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 147 SyntacticMatches, 11 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3540 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=1302, Invalid=16788, Unknown=0, NotChecked=0, Total=18090 [2022-11-19 06:42:41,736 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 166 mSDsluCounter, 869 mSDsCounter, 0 mSdLazyCounter, 2296 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 167 SdHoareTripleChecker+Valid, 892 SdHoareTripleChecker+Invalid, 2373 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 2296 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2022-11-19 06:42:41,736 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [167 Valid, 892 Invalid, 2373 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 2296 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2022-11-19 06:42:41,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-11-19 06:42:41,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 79. [2022-11-19 06:42:41,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 53 states have (on average 1.0754716981132075) internal successors, (57), 54 states have internal predecessors, (57), 9 states have call successors, (9), 4 states have call predecessors, (9), 16 states have return successors, (46), 20 states have call predecessors, (46), 9 states have call successors, (46) [2022-11-19 06:42:41,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 112 transitions. [2022-11-19 06:42:41,751 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 112 transitions. Word has length 124 [2022-11-19 06:42:41,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:42:41,752 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 112 transitions. [2022-11-19 06:42:41,752 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 81 states, 77 states have (on average 1.4025974025974026) internal successors, (108), 53 states have internal predecessors, (108), 17 states have call successors, (17), 1 states have call predecessors, (17), 26 states have return successors, (28), 28 states have call predecessors, (28), 17 states have call successors, (28) [2022-11-19 06:42:41,752 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 112 transitions. [2022-11-19 06:42:41,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2022-11-19 06:42:41,753 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:42:41,754 INFO L195 NwaCegarLoop]: trace histogram [13, 13, 13, 11, 11, 11, 11, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:42:41,759 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2022-11-19 06:42:41,958 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:42:41,959 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:42:41,959 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:42:41,959 INFO L85 PathProgramCache]: Analyzing trace with hash -2050033702, now seen corresponding path program 17 times [2022-11-19 06:42:41,959 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:42:41,959 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240198203] [2022-11-19 06:42:41,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:42:41,959 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:42:41,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:42:44,181 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 0 proven. 418 refuted. 0 times theorem prover too weak. 82 trivial. 0 not checked. [2022-11-19 06:42:44,181 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:42:44,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240198203] [2022-11-19 06:42:44,181 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240198203] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:42:44,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [525170847] [2022-11-19 06:42:44,181 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:42:44,182 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:42:44,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:42:44,182 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:42:44,185 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2022-11-19 06:42:44,350 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2022-11-19 06:42:44,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:42:44,355 WARN L261 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 156 conjunts are in the unsatisfiable core [2022-11-19 06:42:44,357 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:42:46,898 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 24 proven. 247 refuted. 0 times theorem prover too weak. 229 trivial. 0 not checked. [2022-11-19 06:42:46,899 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:42:54,535 INFO L134 CoverageAnalysis]: Checked inductivity of 500 backedges. 39 proven. 383 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2022-11-19 06:42:54,535 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [525170847] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:42:54,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [248938775] [2022-11-19 06:42:54,537 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:42:54,537 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:42:54,537 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:42:54,537 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:42:54,538 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 32, 46] total 104 [2022-11-19 06:42:54,538 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798502069] [2022-11-19 06:42:54,538 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:42:54,538 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2022-11-19 06:42:54,538 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:42:54,539 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2022-11-19 06:42:54,540 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=431, Invalid=10281, Unknown=0, NotChecked=0, Total=10712 [2022-11-19 06:42:54,541 INFO L87 Difference]: Start difference. First operand 79 states and 112 transitions. Second operand has 104 states, 97 states have (on average 1.5360824742268042) internal successors, (149), 68 states have internal predecessors, (149), 28 states have call successors, (28), 1 states have call predecessors, (28), 24 states have return successors, (38), 36 states have call predecessors, (38), 28 states have call successors, (38) [2022-11-19 06:42:57,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:42:57,843 INFO L93 Difference]: Finished difference Result 99 states and 135 transitions. [2022-11-19 06:42:57,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-19 06:42:57,843 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 97 states have (on average 1.5360824742268042) internal successors, (149), 68 states have internal predecessors, (149), 28 states have call successors, (28), 1 states have call predecessors, (28), 24 states have return successors, (38), 36 states have call predecessors, (38), 28 states have call successors, (38) Word has length 96 [2022-11-19 06:42:57,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:42:57,845 INFO L225 Difference]: With dead ends: 99 [2022-11-19 06:42:57,845 INFO L226 Difference]: Without dead ends: 93 [2022-11-19 06:42:57,847 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 266 GetRequests, 122 SyntacticMatches, 13 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4120 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=1462, Invalid=16094, Unknown=0, NotChecked=0, Total=17556 [2022-11-19 06:42:57,847 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 148 mSDsluCounter, 717 mSDsCounter, 0 mSdLazyCounter, 2583 mSolverCounterSat, 78 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 739 SdHoareTripleChecker+Invalid, 2661 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 78 IncrementalHoareTripleChecker+Valid, 2583 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2022-11-19 06:42:57,848 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [163 Valid, 739 Invalid, 2661 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [78 Valid, 2583 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2022-11-19 06:42:57,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2022-11-19 06:42:57,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 79. [2022-11-19 06:42:57,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 53 states have (on average 1.0754716981132075) internal successors, (57), 54 states have internal predecessors, (57), 9 states have call successors, (9), 4 states have call predecessors, (9), 16 states have return successors, (41), 20 states have call predecessors, (41), 9 states have call successors, (41) [2022-11-19 06:42:57,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 107 transitions. [2022-11-19 06:42:57,864 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 107 transitions. Word has length 96 [2022-11-19 06:42:57,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:42:57,865 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 107 transitions. [2022-11-19 06:42:57,865 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 97 states have (on average 1.5360824742268042) internal successors, (149), 68 states have internal predecessors, (149), 28 states have call successors, (28), 1 states have call predecessors, (28), 24 states have return successors, (38), 36 states have call predecessors, (38), 28 states have call successors, (38) [2022-11-19 06:42:57,865 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 107 transitions. [2022-11-19 06:42:57,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-19 06:42:57,866 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:42:57,867 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 12, 12, 12, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:42:57,873 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2022-11-19 06:42:58,073 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:42:58,073 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:42:58,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:42:58,073 INFO L85 PathProgramCache]: Analyzing trace with hash -772884420, now seen corresponding path program 18 times [2022-11-19 06:42:58,073 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:42:58,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790581566] [2022-11-19 06:42:58,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:42:58,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:42:58,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:43:00,481 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 0 proven. 492 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2022-11-19 06:43:00,481 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:43:00,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790581566] [2022-11-19 06:43:00,481 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [790581566] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:43:00,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [621352495] [2022-11-19 06:43:00,481 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:43:00,481 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:43:00,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:43:00,482 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:43:00,485 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2022-11-19 06:43:00,649 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:43:00,649 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:43:00,653 WARN L261 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 169 conjunts are in the unsatisfiable core [2022-11-19 06:43:00,656 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:43:02,655 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 5 proven. 274 refuted. 0 times theorem prover too weak. 308 trivial. 0 not checked. [2022-11-19 06:43:02,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:43:08,644 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [621352495] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:43:08,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1408938933] [2022-11-19 06:43:08,645 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:43:08,645 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:43:08,646 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:43:08,646 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:43:08,646 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 24] total 70 [2022-11-19 06:43:08,646 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729172571] [2022-11-19 06:43:08,646 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:43:08,647 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2022-11-19 06:43:08,647 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:43:08,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2022-11-19 06:43:08,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=8232, Unknown=0, NotChecked=0, Total=8556 [2022-11-19 06:43:08,648 INFO L87 Difference]: Start difference. First operand 79 states and 107 transitions. Second operand has 70 states, 66 states have (on average 1.4393939393939394) internal successors, (95), 47 states have internal predecessors, (95), 16 states have call successors, (16), 1 states have call predecessors, (16), 21 states have return successors, (23), 23 states have call predecessors, (23), 16 states have call successors, (23) [2022-11-19 06:43:10,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:43:10,949 INFO L93 Difference]: Finished difference Result 89 states and 117 transitions. [2022-11-19 06:43:10,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2022-11-19 06:43:10,960 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 66 states have (on average 1.4393939393939394) internal successors, (95), 47 states have internal predecessors, (95), 16 states have call successors, (16), 1 states have call predecessors, (16), 21 states have return successors, (23), 23 states have call predecessors, (23), 16 states have call successors, (23) Word has length 103 [2022-11-19 06:43:10,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:43:10,961 INFO L225 Difference]: With dead ends: 89 [2022-11-19 06:43:10,961 INFO L226 Difference]: Without dead ends: 85 [2022-11-19 06:43:10,963 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 112 SyntacticMatches, 7 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2205 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=972, Invalid=11460, Unknown=0, NotChecked=0, Total=12432 [2022-11-19 06:43:10,964 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 247 mSDsluCounter, 637 mSDsCounter, 0 mSdLazyCounter, 1595 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 249 SdHoareTripleChecker+Valid, 657 SdHoareTripleChecker+Invalid, 1714 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 1595 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:43:10,964 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [249 Valid, 657 Invalid, 1714 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 1595 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2022-11-19 06:43:10,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2022-11-19 06:43:10,979 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 79. [2022-11-19 06:43:10,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 53 states have (on average 1.0754716981132075) internal successors, (57), 54 states have internal predecessors, (57), 9 states have call successors, (9), 4 states have call predecessors, (9), 16 states have return successors, (41), 20 states have call predecessors, (41), 9 states have call successors, (41) [2022-11-19 06:43:10,980 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 107 transitions. [2022-11-19 06:43:10,980 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 107 transitions. Word has length 103 [2022-11-19 06:43:10,981 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:43:10,981 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 107 transitions. [2022-11-19 06:43:10,981 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 66 states have (on average 1.4393939393939394) internal successors, (95), 47 states have internal predecessors, (95), 16 states have call successors, (16), 1 states have call predecessors, (16), 21 states have return successors, (23), 23 states have call predecessors, (23), 16 states have call successors, (23) [2022-11-19 06:43:10,981 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 107 transitions. [2022-11-19 06:43:10,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-19 06:43:10,982 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:43:10,983 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 17, 15, 15, 15, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:43:10,990 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2022-11-19 06:43:11,189 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:43:11,189 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:43:11,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:43:11,190 INFO L85 PathProgramCache]: Analyzing trace with hash 1826787688, now seen corresponding path program 19 times [2022-11-19 06:43:11,190 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:43:11,190 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [675116320] [2022-11-19 06:43:11,190 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:43:11,190 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:43:11,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:43:14,383 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 1 proven. 746 refuted. 0 times theorem prover too weak. 143 trivial. 0 not checked. [2022-11-19 06:43:14,384 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:43:14,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [675116320] [2022-11-19 06:43:14,384 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [675116320] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:43:14,384 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [605240470] [2022-11-19 06:43:14,384 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:43:14,384 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:43:14,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:43:14,385 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:43:14,391 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2022-11-19 06:43:14,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:43:14,579 WARN L261 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 205 conjunts are in the unsatisfiable core [2022-11-19 06:43:14,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:43:17,395 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 10 proven. 410 refuted. 0 times theorem prover too weak. 470 trivial. 0 not checked. [2022-11-19 06:43:17,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:45:01,105 WARN L233 SmtUtils]: Spent 10.23s on a formula simplification that was a NOOP. DAG size: 47 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 06:45:03,248 WARN L837 $PredicateComparison]: unable to prove that (and (forall ((|aux_mod_v_mult_#in~n_BEFORE_CALL_277_48| Int) (|aux_div_v_mult_#in~n_BEFORE_CALL_277_48| Int)) (let ((.cse0 (* |aux_div_v_mult_#in~n_BEFORE_CALL_277_48| 4)) (.cse1 (* 2 |aux_mod_v_mult_#in~n_BEFORE_CALL_277_48|))) (let ((.cse2 (* 2 |c_mult_#in~n|)) (.cse3 (+ .cse0 .cse1 11))) (or (< (* 21 (div (+ (* (- 2) (div (* (- 3) |aux_mod_v_mult_#in~n_BEFORE_CALL_277_48|) 2)) 21 |aux_mod_v_mult_#in~n_BEFORE_CALL_277_48|) 8)) (+ (* 8 |aux_mod_v_mult_#in~n_BEFORE_CALL_277_48|) 55)) (not (< (+ .cse0 .cse1 9) .cse2)) (>= |aux_mod_v_mult_#in~n_BEFORE_CALL_277_48| 2) (not (< .cse2 .cse3)) (< (+ c_mult_~n |c_mult_#t~ret5| |c_mult_#in~n|) .cse3))))) (<= |c_mult_#in~m| 1) (or (< |c_mult_#in~n| (+ c_mult_~n |c_mult_#t~ret5| 1)) (< (* 2 (div |c_mult_#in~n| 2)) |c_mult_#in~n|)) (<= 1 |c_mult_#in~m|)) is different from false [2022-11-19 06:45:14,076 WARN L233 SmtUtils]: Spent 10.18s on a formula simplification that was a NOOP. DAG size: 52 (called from [L 361] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2022-11-19 06:45:14,076 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [605240470] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:45:14,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1610731069] [2022-11-19 06:45:14,077 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:45:14,077 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:45:14,078 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:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:45:14,078 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:45:14,078 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 30] total 84 [2022-11-19 06:45:14,078 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1867578386] [2022-11-19 06:45:14,078 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:45:14,079 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2022-11-19 06:45:14,079 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:45:14,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2022-11-19 06:45:14,083 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=447, Invalid=14773, Unknown=36, NotChecked=244, Total=15500 [2022-11-19 06:45:14,084 INFO L87 Difference]: Start difference. First operand 79 states and 107 transitions. Second operand has 84 states, 80 states have (on average 1.4125) internal successors, (113), 55 states have internal predecessors, (113), 18 states have call successors, (18), 1 states have call predecessors, (18), 27 states have return successors, (29), 29 states have call predecessors, (29), 18 states have call successors, (29) [2022-11-19 06:45:21,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:45:21,891 INFO L93 Difference]: Finished difference Result 92 states and 128 transitions. [2022-11-19 06:45:21,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-19 06:45:21,892 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 80 states have (on average 1.4125) internal successors, (113), 55 states have internal predecessors, (113), 18 states have call successors, (18), 1 states have call predecessors, (18), 27 states have return successors, (29), 29 states have call predecessors, (29), 18 states have call successors, (29) Word has length 124 [2022-11-19 06:45:21,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:45:21,893 INFO L225 Difference]: With dead ends: 92 [2022-11-19 06:45:21,893 INFO L226 Difference]: Without dead ends: 88 [2022-11-19 06:45:21,896 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 148 SyntacticMatches, 12 SemanticMatches, 148 ConstructedPredicates, 1 IntricatePredicates, 1 DeprecatedPredicates, 4809 ImplicationChecksByTransitivity, 114.1s TimeCoverageRelationStatistics Valid=1534, Invalid=20486, Unknown=36, NotChecked=294, Total=22350 [2022-11-19 06:45:21,896 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 132 mSDsluCounter, 951 mSDsCounter, 0 mSdLazyCounter, 2567 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 974 SdHoareTripleChecker+Invalid, 2629 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 2567 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2022-11-19 06:45:21,897 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 974 Invalid, 2629 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 2567 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2022-11-19 06:45:21,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-19 06:45:21,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 84. [2022-11-19 06:45:21,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 56 states have (on average 1.0714285714285714) internal successors, (60), 57 states have internal predecessors, (60), 10 states have call successors, (10), 4 states have call predecessors, (10), 17 states have return successors, (51), 22 states have call predecessors, (51), 10 states have call successors, (51) [2022-11-19 06:45:21,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 121 transitions. [2022-11-19 06:45:21,916 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 121 transitions. Word has length 124 [2022-11-19 06:45:21,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:45:21,916 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 121 transitions. [2022-11-19 06:45:21,917 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 80 states have (on average 1.4125) internal successors, (113), 55 states have internal predecessors, (113), 18 states have call successors, (18), 1 states have call predecessors, (18), 27 states have return successors, (29), 29 states have call predecessors, (29), 18 states have call successors, (29) [2022-11-19 06:45:21,917 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 121 transitions. [2022-11-19 06:45:21,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-11-19 06:45:21,918 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:45:21,919 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 18, 16, 16, 16, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:45:21,925 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2022-11-19 06:45:22,124 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:45:22,125 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:45:22,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:45:22,125 INFO L85 PathProgramCache]: Analyzing trace with hash -2116040742, now seen corresponding path program 20 times [2022-11-19 06:45:22,126 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:45:22,126 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2132655203] [2022-11-19 06:45:22,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:45:22,126 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:45:22,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:45:28,529 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 0 proven. 845 refuted. 0 times theorem prover too weak. 160 trivial. 0 not checked. [2022-11-19 06:45:28,529 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:45:28,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2132655203] [2022-11-19 06:45:28,529 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2132655203] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:45:28,529 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [73598355] [2022-11-19 06:45:28,529 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:45:28,530 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:45:28,530 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:45:28,531 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:45:28,534 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2022-11-19 06:45:28,759 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2022-11-19 06:45:28,759 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:45:28,764 WARN L261 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 217 conjunts are in the unsatisfiable core [2022-11-19 06:45:28,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:45:35,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 21 proven. 450 refuted. 0 times theorem prover too weak. 534 trivial. 0 not checked. [2022-11-19 06:45:35,079 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:45:56,035 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [73598355] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:45:56,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1349725088] [2022-11-19 06:45:56,037 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:45:56,037 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:45:56,037 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:45:56,041 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:45:56,042 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 30] total 87 [2022-11-19 06:45:56,042 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [766030500] [2022-11-19 06:45:56,042 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:45:56,043 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2022-11-19 06:45:56,043 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:45:56,043 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2022-11-19 06:45:56,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=422, Invalid=13858, Unknown=0, NotChecked=0, Total=14280 [2022-11-19 06:45:56,046 INFO L87 Difference]: Start difference. First operand 84 states and 121 transitions. Second operand has 87 states, 83 states have (on average 1.4457831325301205) internal successors, (120), 57 states have internal predecessors, (120), 19 states have call successors, (19), 1 states have call predecessors, (19), 28 states have return successors, (30), 30 states have call predecessors, (30), 19 states have call successors, (30) [2022-11-19 06:46:03,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:46:03,059 INFO L93 Difference]: Finished difference Result 94 states and 131 transitions. [2022-11-19 06:46:03,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-19 06:46:03,060 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 83 states have (on average 1.4457831325301205) internal successors, (120), 57 states have internal predecessors, (120), 19 states have call successors, (19), 1 states have call predecessors, (19), 28 states have return successors, (30), 30 states have call predecessors, (30), 19 states have call successors, (30) Word has length 131 [2022-11-19 06:46:03,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:46:03,062 INFO L225 Difference]: With dead ends: 94 [2022-11-19 06:46:03,062 INFO L226 Difference]: Without dead ends: 90 [2022-11-19 06:46:03,066 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 153 SyntacticMatches, 14 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4161 ImplicationChecksByTransitivity, 25.3s TimeCoverageRelationStatistics Valid=1483, Invalid=19397, Unknown=0, NotChecked=0, Total=20880 [2022-11-19 06:46:03,066 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 440 mSDsluCounter, 982 mSDsCounter, 0 mSdLazyCounter, 2634 mSolverCounterSat, 216 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 441 SdHoareTripleChecker+Valid, 1006 SdHoareTripleChecker+Invalid, 2850 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 216 IncrementalHoareTripleChecker+Valid, 2634 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2022-11-19 06:46:03,067 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [441 Valid, 1006 Invalid, 2850 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [216 Valid, 2634 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2022-11-19 06:46:03,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2022-11-19 06:46:03,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 84. [2022-11-19 06:46:03,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 56 states have (on average 1.0714285714285714) internal successors, (60), 57 states have internal predecessors, (60), 10 states have call successors, (10), 4 states have call predecessors, (10), 17 states have return successors, (51), 22 states have call predecessors, (51), 10 states have call successors, (51) [2022-11-19 06:46:03,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 121 transitions. [2022-11-19 06:46:03,087 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 121 transitions. Word has length 131 [2022-11-19 06:46:03,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:46:03,087 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 121 transitions. [2022-11-19 06:46:03,088 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 83 states have (on average 1.4457831325301205) internal successors, (120), 57 states have internal predecessors, (120), 19 states have call successors, (19), 1 states have call predecessors, (19), 28 states have return successors, (30), 30 states have call predecessors, (30), 19 states have call successors, (30) [2022-11-19 06:46:03,088 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 121 transitions. [2022-11-19 06:46:03,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2022-11-19 06:46:03,089 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:46:03,089 INFO L195 NwaCegarLoop]: trace histogram [19, 19, 19, 17, 17, 17, 17, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:46:03,096 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2022-11-19 06:46:03,295 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2022-11-19 06:46:03,296 INFO L420 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:46:03,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:46:03,296 INFO L85 PathProgramCache]: Analyzing trace with hash -1843883272, now seen corresponding path program 21 times [2022-11-19 06:46:03,296 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:46:03,296 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [404677630] [2022-11-19 06:46:03,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:46:03,297 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:46:03,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:46:11,128 INFO L134 CoverageAnalysis]: Checked inductivity of 1127 backedges. 0 proven. 952 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2022-11-19 06:46:11,128 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:46:11,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [404677630] [2022-11-19 06:46:11,128 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [404677630] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:46:11,128 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [64951131] [2022-11-19 06:46:11,129 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:46:11,129 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:46:11,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:46:11,132 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:46:11,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2022-11-19 06:46:11,371 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:46:11,371 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:46:11,376 WARN L261 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 229 conjunts are in the unsatisfiable core [2022-11-19 06:46:11,381 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:46:18,248 INFO L134 CoverageAnalysis]: Checked inductivity of 1127 backedges. 10 proven. 513 refuted. 0 times theorem prover too weak. 604 trivial. 0 not checked. [2022-11-19 06:46:18,248 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:46:42,170 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [64951131] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:46:42,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [194695765] [2022-11-19 06:46:42,172 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:46:42,172 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:46:42,172 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:46:42,172 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:46:42,172 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 30] total 91 [2022-11-19 06:46:42,173 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22278708] [2022-11-19 06:46:42,173 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:46:42,173 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2022-11-19 06:46:42,173 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:46:42,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2022-11-19 06:46:42,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=14815, Unknown=0, NotChecked=0, Total=15252 [2022-11-19 06:46:42,176 INFO L87 Difference]: Start difference. First operand 84 states and 121 transitions. Second operand has 91 states, 87 states have (on average 1.4482758620689655) internal successors, (126), 60 states have internal predecessors, (126), 21 states have call successors, (21), 1 states have call predecessors, (21), 29 states have return successors, (31), 31 states have call predecessors, (31), 21 states have call successors, (31) [2022-11-19 06:46:50,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:46:50,214 INFO L93 Difference]: Finished difference Result 92 states and 127 transitions. [2022-11-19 06:46:50,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2022-11-19 06:46:50,214 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 87 states have (on average 1.4482758620689655) internal successors, (126), 60 states have internal predecessors, (126), 21 states have call successors, (21), 1 states have call predecessors, (21), 29 states have return successors, (31), 31 states have call predecessors, (31), 21 states have call successors, (31) Word has length 138 [2022-11-19 06:46:50,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:46:50,215 INFO L225 Difference]: With dead ends: 92 [2022-11-19 06:46:50,215 INFO L226 Difference]: Without dead ends: 88 [2022-11-19 06:46:50,217 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 320 GetRequests, 161 SyntacticMatches, 12 SemanticMatches, 147 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4096 ImplicationChecksByTransitivity, 29.3s TimeCoverageRelationStatistics Valid=1546, Invalid=20506, Unknown=0, NotChecked=0, Total=22052 [2022-11-19 06:46:50,218 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 349 mSDsluCounter, 1104 mSDsCounter, 0 mSdLazyCounter, 2888 mSolverCounterSat, 168 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 350 SdHoareTripleChecker+Valid, 1128 SdHoareTripleChecker+Invalid, 3056 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 168 IncrementalHoareTripleChecker+Valid, 2888 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:46:50,218 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [350 Valid, 1128 Invalid, 3056 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [168 Valid, 2888 Invalid, 0 Unknown, 0 Unchecked, 4.2s Time] [2022-11-19 06:46:50,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-19 06:46:50,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 82. [2022-11-19 06:46:50,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 55 states have (on average 1.0727272727272728) internal successors, (59), 56 states have internal predecessors, (59), 9 states have call successors, (9), 4 states have call predecessors, (9), 17 states have return successors, (49), 21 states have call predecessors, (49), 9 states have call successors, (49) [2022-11-19 06:46:50,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 117 transitions. [2022-11-19 06:46:50,237 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 117 transitions. Word has length 138 [2022-11-19 06:46:50,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:46:50,237 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 117 transitions. [2022-11-19 06:46:50,238 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 87 states have (on average 1.4482758620689655) internal successors, (126), 60 states have internal predecessors, (126), 21 states have call successors, (21), 1 states have call predecessors, (21), 29 states have return successors, (31), 31 states have call predecessors, (31), 21 states have call successors, (31) [2022-11-19 06:46:50,238 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 117 transitions. [2022-11-19 06:46:50,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2022-11-19 06:46:50,252 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:46:50,253 INFO L195 NwaCegarLoop]: trace histogram [14, 14, 14, 12, 12, 12, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:46:50,260 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2022-11-19 06:46:50,459 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2022-11-19 06:46:50,460 INFO L420 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:46:50,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:46:50,461 INFO L85 PathProgramCache]: Analyzing trace with hash 1109932794, now seen corresponding path program 22 times [2022-11-19 06:46:50,461 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:46:50,461 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1841305608] [2022-11-19 06:46:50,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:46:50,461 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:46:50,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:46:54,778 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 0 proven. 492 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2022-11-19 06:46:54,778 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:46:54,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1841305608] [2022-11-19 06:46:54,779 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1841305608] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:46:54,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [160332794] [2022-11-19 06:46:54,779 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:46:54,779 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:46:54,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:46:54,788 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:46:54,794 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2022-11-19 06:46:55,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:46:55,033 WARN L261 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 169 conjunts are in the unsatisfiable core [2022-11-19 06:46:55,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:47:00,864 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 10 proven. 278 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked. [2022-11-19 06:47:00,865 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:47:17,941 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 41 proven. 451 refuted. 0 times theorem prover too weak. 95 trivial. 0 not checked. [2022-11-19 06:47:17,942 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [160332794] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:47:17,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1840639532] [2022-11-19 06:47:17,943 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:47:17,943 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:47:17,943 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:47:17,944 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:47:17,944 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 30, 45] total 106 [2022-11-19 06:47:17,944 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725368041] [2022-11-19 06:47:17,944 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:47:17,945 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 106 states [2022-11-19 06:47:17,945 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:47:17,945 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 106 interpolants. [2022-11-19 06:47:17,946 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363, Invalid=10767, Unknown=0, NotChecked=0, Total=11130 [2022-11-19 06:47:17,947 INFO L87 Difference]: Start difference. First operand 82 states and 117 transitions. Second operand has 106 states, 101 states have (on average 1.5346534653465347) internal successors, (155), 67 states have internal predecessors, (155), 29 states have call successors, (29), 1 states have call predecessors, (29), 26 states have return successors, (40), 39 states have call predecessors, (40), 29 states have call successors, (40) [2022-11-19 06:47:27,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:47:27,387 INFO L93 Difference]: Finished difference Result 102 states and 140 transitions. [2022-11-19 06:47:27,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2022-11-19 06:47:27,388 INFO L78 Accepts]: Start accepts. Automaton has has 106 states, 101 states have (on average 1.5346534653465347) internal successors, (155), 67 states have internal predecessors, (155), 29 states have call successors, (29), 1 states have call predecessors, (29), 26 states have return successors, (40), 39 states have call predecessors, (40), 29 states have call successors, (40) Word has length 103 [2022-11-19 06:47:27,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:47:27,390 INFO L225 Difference]: With dead ends: 102 [2022-11-19 06:47:27,390 INFO L226 Difference]: Without dead ends: 96 [2022-11-19 06:47:27,393 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 137 SyntacticMatches, 13 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4378 ImplicationChecksByTransitivity, 21.6s TimeCoverageRelationStatistics Valid=1533, Invalid=17649, Unknown=0, NotChecked=0, Total=19182 [2022-11-19 06:47:27,393 INFO L413 NwaCegarLoop]: 24 mSDtfsCounter, 307 mSDsluCounter, 1027 mSDsCounter, 0 mSdLazyCounter, 3448 mSolverCounterSat, 187 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 310 SdHoareTripleChecker+Valid, 1051 SdHoareTripleChecker+Invalid, 3635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 187 IncrementalHoareTripleChecker+Valid, 3448 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:47:27,394 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [310 Valid, 1051 Invalid, 3635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [187 Valid, 3448 Invalid, 0 Unknown, 0 Unchecked, 5.1s Time] [2022-11-19 06:47:27,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2022-11-19 06:47:27,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 82. [2022-11-19 06:47:27,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 55 states have (on average 1.0727272727272728) internal successors, (59), 56 states have internal predecessors, (59), 9 states have call successors, (9), 4 states have call predecessors, (9), 17 states have return successors, (44), 21 states have call predecessors, (44), 9 states have call successors, (44) [2022-11-19 06:47:27,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 112 transitions. [2022-11-19 06:47:27,414 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 112 transitions. Word has length 103 [2022-11-19 06:47:27,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:47:27,414 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 112 transitions. [2022-11-19 06:47:27,415 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 106 states, 101 states have (on average 1.5346534653465347) internal successors, (155), 67 states have internal predecessors, (155), 29 states have call successors, (29), 1 states have call predecessors, (29), 26 states have return successors, (40), 39 states have call predecessors, (40), 29 states have call successors, (40) [2022-11-19 06:47:27,415 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 112 transitions. [2022-11-19 06:47:27,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-11-19 06:47:27,416 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:47:27,416 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 13, 13, 13, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:47:27,428 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2022-11-19 06:47:27,629 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:47:27,629 INFO L420 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:47:27,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:47:27,629 INFO L85 PathProgramCache]: Analyzing trace with hash 1650246186, now seen corresponding path program 23 times [2022-11-19 06:47:27,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:47:27,629 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20433885] [2022-11-19 06:47:27,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:47:27,630 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:47:27,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:47:32,957 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 572 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2022-11-19 06:47:32,957 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:47:32,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20433885] [2022-11-19 06:47:32,958 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [20433885] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:47:32,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1205398802] [2022-11-19 06:47:32,958 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:47:32,958 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:47:32,958 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:47:32,959 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:47:32,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2022-11-19 06:47:33,244 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2022-11-19 06:47:33,244 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:47:33,249 WARN L261 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 181 conjunts are in the unsatisfiable core [2022-11-19 06:47:33,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:47:37,894 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 5 proven. 318 refuted. 0 times theorem prover too weak. 358 trivial. 0 not checked. [2022-11-19 06:47:37,894 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:47:51,620 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1205398802] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:47:51,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1936133911] [2022-11-19 06:47:51,622 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:47:51,622 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:47:51,622 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:47:51,623 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:47:51,624 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 26] total 75 [2022-11-19 06:47:51,624 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146508879] [2022-11-19 06:47:51,624 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:47:51,624 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 75 states [2022-11-19 06:47:51,624 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:47:51,625 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 75 interpolants. [2022-11-19 06:47:51,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=339, Invalid=9167, Unknown=0, NotChecked=0, Total=9506 [2022-11-19 06:47:51,627 INFO L87 Difference]: Start difference. First operand 82 states and 112 transitions. Second operand has 75 states, 71 states have (on average 1.4366197183098592) internal successors, (102), 50 states have internal predecessors, (102), 17 states have call successors, (17), 1 states have call predecessors, (17), 23 states have return successors, (25), 25 states have call predecessors, (25), 17 states have call successors, (25) [2022-11-19 06:47:57,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:47:57,155 INFO L93 Difference]: Finished difference Result 92 states and 122 transitions. [2022-11-19 06:47:57,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2022-11-19 06:47:57,155 INFO L78 Accepts]: Start accepts. Automaton has has 75 states, 71 states have (on average 1.4366197183098592) internal successors, (102), 50 states have internal predecessors, (102), 17 states have call successors, (17), 1 states have call predecessors, (17), 23 states have return successors, (25), 25 states have call predecessors, (25), 17 states have call successors, (25) Word has length 110 [2022-11-19 06:47:57,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:47:57,157 INFO L225 Difference]: With dead ends: 92 [2022-11-19 06:47:57,157 INFO L226 Difference]: Without dead ends: 88 [2022-11-19 06:47:57,159 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 117 SyntacticMatches, 7 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2453 ImplicationChecksByTransitivity, 18.3s TimeCoverageRelationStatistics Valid=1080, Invalid=12962, Unknown=0, NotChecked=0, Total=14042 [2022-11-19 06:47:57,160 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 355 mSDsluCounter, 610 mSDsCounter, 0 mSdLazyCounter, 1922 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 356 SdHoareTripleChecker+Valid, 629 SdHoareTripleChecker+Invalid, 2093 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 1922 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2022-11-19 06:47:57,160 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [356 Valid, 629 Invalid, 2093 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 1922 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2022-11-19 06:47:57,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2022-11-19 06:47:57,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 82. [2022-11-19 06:47:57,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 55 states have (on average 1.0727272727272728) internal successors, (59), 56 states have internal predecessors, (59), 9 states have call successors, (9), 4 states have call predecessors, (9), 17 states have return successors, (44), 21 states have call predecessors, (44), 9 states have call successors, (44) [2022-11-19 06:47:57,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 112 transitions. [2022-11-19 06:47:57,180 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 112 transitions. Word has length 110 [2022-11-19 06:47:57,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:47:57,181 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 112 transitions. [2022-11-19 06:47:57,181 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 75 states, 71 states have (on average 1.4366197183098592) internal successors, (102), 50 states have internal predecessors, (102), 17 states have call successors, (17), 1 states have call predecessors, (17), 23 states have return successors, (25), 25 states have call predecessors, (25), 17 states have call successors, (25) [2022-11-19 06:47:57,181 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 112 transitions. [2022-11-19 06:47:57,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2022-11-19 06:47:57,182 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:47:57,182 INFO L195 NwaCegarLoop]: trace histogram [15, 15, 15, 13, 13, 13, 13, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:47:57,189 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2022-11-19 06:47:57,389 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2022-11-19 06:47:57,389 INFO L420 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:47:57,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:47:57,390 INFO L85 PathProgramCache]: Analyzing trace with hash 209449994, now seen corresponding path program 24 times [2022-11-19 06:47:57,390 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:47:57,390 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [964254478] [2022-11-19 06:47:57,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:47:57,390 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:47:57,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:48:02,181 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 572 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2022-11-19 06:48:02,181 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:48:02,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [964254478] [2022-11-19 06:48:02,182 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [964254478] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:48:02,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1812431602] [2022-11-19 06:48:02,182 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:48:02,182 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:48:02,182 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:48:02,183 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:48:02,186 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2022-11-19 06:48:02,459 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:48:02,459 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:48:02,463 WARN L261 TraceCheckSpWp]: Trace formula consists of 330 conjuncts, 181 conjunts are in the unsatisfiable core [2022-11-19 06:48:02,467 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:48:08,675 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 11 proven. 321 refuted. 0 times theorem prover too weak. 349 trivial. 0 not checked. [2022-11-19 06:48:08,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:48:27,582 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 44 proven. 528 refuted. 0 times theorem prover too weak. 109 trivial. 0 not checked. [2022-11-19 06:48:27,582 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1812431602] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:48:27,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [543337341] [2022-11-19 06:48:27,584 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:48:27,584 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:48:27,584 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:48:27,584 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:48:27,584 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 32, 48] total 113 [2022-11-19 06:48:27,584 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166747440] [2022-11-19 06:48:27,585 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:48:27,585 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2022-11-19 06:48:27,585 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:48:27,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2022-11-19 06:48:27,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=387, Invalid=12269, Unknown=0, NotChecked=0, Total=12656 [2022-11-19 06:48:27,587 INFO L87 Difference]: Start difference. First operand 82 states and 112 transitions. Second operand has 113 states, 108 states have (on average 1.537037037037037) internal successors, (166), 71 states have internal predecessors, (166), 31 states have call successors, (31), 1 states have call predecessors, (31), 28 states have return successors, (43), 42 states have call predecessors, (43), 31 states have call successors, (43) [2022-11-19 06:48:38,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:48:38,875 INFO L93 Difference]: Finished difference Result 105 states and 146 transitions. [2022-11-19 06:48:38,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2022-11-19 06:48:38,875 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 108 states have (on average 1.537037037037037) internal successors, (166), 71 states have internal predecessors, (166), 31 states have call successors, (31), 1 states have call predecessors, (31), 28 states have return successors, (43), 42 states have call predecessors, (43), 31 states have call successors, (43) Word has length 110 [2022-11-19 06:48:38,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:48:38,876 INFO L225 Difference]: With dead ends: 105 [2022-11-19 06:48:38,876 INFO L226 Difference]: Without dead ends: 99 [2022-11-19 06:48:38,878 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 146 SyntacticMatches, 14 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4987 ImplicationChecksByTransitivity, 23.9s TimeCoverageRelationStatistics Valid=1702, Invalid=20054, Unknown=0, NotChecked=0, Total=21756 [2022-11-19 06:48:38,879 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 723 mSDsluCounter, 1178 mSDsCounter, 0 mSdLazyCounter, 3896 mSolverCounterSat, 398 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 725 SdHoareTripleChecker+Valid, 1204 SdHoareTripleChecker+Invalid, 4294 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 398 IncrementalHoareTripleChecker+Valid, 3896 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.1s IncrementalHoareTripleChecker+Time [2022-11-19 06:48:38,879 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [725 Valid, 1204 Invalid, 4294 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [398 Valid, 3896 Invalid, 0 Unknown, 0 Unchecked, 6.1s Time] [2022-11-19 06:48:38,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-11-19 06:48:38,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 85. [2022-11-19 06:48:38,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 57 states have (on average 1.0701754385964912) internal successors, (61), 58 states have internal predecessors, (61), 9 states have call successors, (9), 4 states have call predecessors, (9), 18 states have return successors, (47), 22 states have call predecessors, (47), 9 states have call successors, (47) [2022-11-19 06:48:38,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 117 transitions. [2022-11-19 06:48:38,901 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 117 transitions. Word has length 110 [2022-11-19 06:48:38,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:48:38,902 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 117 transitions. [2022-11-19 06:48:38,902 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 108 states have (on average 1.537037037037037) internal successors, (166), 71 states have internal predecessors, (166), 31 states have call successors, (31), 1 states have call predecessors, (31), 28 states have return successors, (43), 42 states have call predecessors, (43), 31 states have call successors, (43) [2022-11-19 06:48:38,902 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 117 transitions. [2022-11-19 06:48:38,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-11-19 06:48:38,904 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:48:38,904 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 16, 14, 14, 14, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:48:38,917 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2022-11-19 06:48:39,111 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2022-11-19 06:48:39,111 INFO L420 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:48:39,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:48:39,112 INFO L85 PathProgramCache]: Analyzing trace with hash -736446292, now seen corresponding path program 25 times [2022-11-19 06:48:39,112 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:48:39,112 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [755817283] [2022-11-19 06:48:39,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:48:39,112 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:48:39,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:48:44,177 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 658 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-11-19 06:48:44,177 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:48:44,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [755817283] [2022-11-19 06:48:44,177 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [755817283] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:48:44,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [439831887] [2022-11-19 06:48:44,177 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:48:44,177 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:48:44,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:48:44,178 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:48:44,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2022-11-19 06:48:44,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:48:44,442 WARN L261 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 193 conjunts are in the unsatisfiable core [2022-11-19 06:48:44,445 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:48:50,056 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 5 proven. 365 refuted. 0 times theorem prover too weak. 412 trivial. 0 not checked. [2022-11-19 06:48:50,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:49:03,916 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [439831887] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:49:03,916 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2000318613] [2022-11-19 06:49:03,918 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:49:03,918 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:49:03,918 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:49:03,918 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:49:03,918 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 28] total 80 [2022-11-19 06:49:03,919 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [445240402] [2022-11-19 06:49:03,919 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:49:03,919 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 80 states [2022-11-19 06:49:03,919 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:49:03,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 80 interpolants. [2022-11-19 06:49:03,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=10150, Unknown=0, NotChecked=0, Total=10506 [2022-11-19 06:49:03,920 INFO L87 Difference]: Start difference. First operand 85 states and 117 transitions. Second operand has 80 states, 76 states have (on average 1.4342105263157894) internal successors, (109), 53 states have internal predecessors, (109), 18 states have call successors, (18), 1 states have call predecessors, (18), 25 states have return successors, (27), 27 states have call predecessors, (27), 18 states have call successors, (27) [2022-11-19 06:49:10,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:49:10,754 INFO L93 Difference]: Finished difference Result 95 states and 127 transitions. [2022-11-19 06:49:10,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2022-11-19 06:49:10,755 INFO L78 Accepts]: Start accepts. Automaton has has 80 states, 76 states have (on average 1.4342105263157894) internal successors, (109), 53 states have internal predecessors, (109), 18 states have call successors, (18), 1 states have call predecessors, (18), 25 states have return successors, (27), 27 states have call predecessors, (27), 18 states have call successors, (27) Word has length 117 [2022-11-19 06:49:10,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:49:10,757 INFO L225 Difference]: With dead ends: 95 [2022-11-19 06:49:10,757 INFO L226 Difference]: Without dead ends: 91 [2022-11-19 06:49:10,759 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 253 GetRequests, 122 SyntacticMatches, 7 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2715 ImplicationChecksByTransitivity, 20.0s TimeCoverageRelationStatistics Valid=1194, Invalid=14556, Unknown=0, NotChecked=0, Total=15750 [2022-11-19 06:49:10,760 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 451 mSDsluCounter, 832 mSDsCounter, 0 mSdLazyCounter, 2160 mSolverCounterSat, 220 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 453 SdHoareTripleChecker+Valid, 854 SdHoareTripleChecker+Invalid, 2380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 220 IncrementalHoareTripleChecker+Valid, 2160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2022-11-19 06:49:10,761 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [453 Valid, 854 Invalid, 2380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [220 Valid, 2160 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2022-11-19 06:49:10,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2022-11-19 06:49:10,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 85. [2022-11-19 06:49:10,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 57 states have (on average 1.0701754385964912) internal successors, (61), 58 states have internal predecessors, (61), 9 states have call successors, (9), 4 states have call predecessors, (9), 18 states have return successors, (47), 22 states have call predecessors, (47), 9 states have call successors, (47) [2022-11-19 06:49:10,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 117 transitions. [2022-11-19 06:49:10,783 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 117 transitions. Word has length 117 [2022-11-19 06:49:10,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:49:10,783 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 117 transitions. [2022-11-19 06:49:10,784 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 80 states, 76 states have (on average 1.4342105263157894) internal successors, (109), 53 states have internal predecessors, (109), 18 states have call successors, (18), 1 states have call predecessors, (18), 25 states have return successors, (27), 27 states have call predecessors, (27), 18 states have call successors, (27) [2022-11-19 06:49:10,784 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 117 transitions. [2022-11-19 06:49:10,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2022-11-19 06:49:10,785 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:49:10,785 INFO L195 NwaCegarLoop]: trace histogram [16, 16, 16, 14, 14, 14, 14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:49:10,793 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2022-11-19 06:49:10,992 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2022-11-19 06:49:10,992 INFO L420 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:49:10,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:49:10,993 INFO L85 PathProgramCache]: Analyzing trace with hash 1925053130, now seen corresponding path program 26 times [2022-11-19 06:49:10,993 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:49:10,993 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [261475383] [2022-11-19 06:49:10,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:49:10,993 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:49:11,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:49:16,613 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 0 proven. 658 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-11-19 06:49:16,614 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:49:16,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [261475383] [2022-11-19 06:49:16,614 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [261475383] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:49:16,614 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1465219446] [2022-11-19 06:49:16,614 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:49:16,614 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:49:16,614 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:49:16,615 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:49:16,618 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2022-11-19 06:49:16,917 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2022-11-19 06:49:16,917 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:49:16,921 WARN L261 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 193 conjunts are in the unsatisfiable core [2022-11-19 06:49:16,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:49:23,325 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 12 proven. 367 refuted. 0 times theorem prover too weak. 403 trivial. 0 not checked. [2022-11-19 06:49:23,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:49:45,457 INFO L134 CoverageAnalysis]: Checked inductivity of 782 backedges. 47 proven. 611 refuted. 0 times theorem prover too weak. 124 trivial. 0 not checked. [2022-11-19 06:49:45,457 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1465219446] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:49:45,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [236646958] [2022-11-19 06:49:45,459 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:49:45,459 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:49:45,459 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:49:45,459 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:49:45,460 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 34, 51] total 120 [2022-11-19 06:49:45,460 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672753070] [2022-11-19 06:49:45,460 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:49:45,460 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 120 states [2022-11-19 06:49:45,461 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:49:45,461 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 120 interpolants. [2022-11-19 06:49:45,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=411, Invalid=13869, Unknown=0, NotChecked=0, Total=14280 [2022-11-19 06:49:45,463 INFO L87 Difference]: Start difference. First operand 85 states and 117 transitions. Second operand has 120 states, 115 states have (on average 1.5391304347826087) internal successors, (177), 75 states have internal predecessors, (177), 33 states have call successors, (33), 1 states have call predecessors, (33), 30 states have return successors, (46), 45 states have call predecessors, (46), 33 states have call successors, (46) [2022-11-19 06:49:56,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:49:56,698 INFO L93 Difference]: Finished difference Result 108 states and 151 transitions. [2022-11-19 06:49:56,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2022-11-19 06:49:56,698 INFO L78 Accepts]: Start accepts. Automaton has has 120 states, 115 states have (on average 1.5391304347826087) internal successors, (177), 75 states have internal predecessors, (177), 33 states have call successors, (33), 1 states have call predecessors, (33), 30 states have return successors, (46), 45 states have call predecessors, (46), 33 states have call successors, (46) Word has length 117 [2022-11-19 06:49:56,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:49:56,700 INFO L225 Difference]: With dead ends: 108 [2022-11-19 06:49:56,700 INFO L226 Difference]: Without dead ends: 102 [2022-11-19 06:49:56,703 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 155 SyntacticMatches, 15 SemanticMatches, 155 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5637 ImplicationChecksByTransitivity, 26.3s TimeCoverageRelationStatistics Valid=1879, Invalid=22613, Unknown=0, NotChecked=0, Total=24492 [2022-11-19 06:49:56,703 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 723 mSDsluCounter, 984 mSDsCounter, 0 mSdLazyCounter, 3590 mSolverCounterSat, 396 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 726 SdHoareTripleChecker+Valid, 1009 SdHoareTripleChecker+Invalid, 3986 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 396 IncrementalHoareTripleChecker+Valid, 3590 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.7s IncrementalHoareTripleChecker+Time [2022-11-19 06:49:56,704 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [726 Valid, 1009 Invalid, 3986 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [396 Valid, 3590 Invalid, 0 Unknown, 0 Unchecked, 5.7s Time] [2022-11-19 06:49:56,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2022-11-19 06:49:56,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 88. [2022-11-19 06:49:56,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 88 states, 59 states have (on average 1.0677966101694916) internal successors, (63), 60 states have internal predecessors, (63), 9 states have call successors, (9), 4 states have call predecessors, (9), 19 states have return successors, (50), 23 states have call predecessors, (50), 9 states have call successors, (50) [2022-11-19 06:49:56,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 122 transitions. [2022-11-19 06:49:56,724 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 122 transitions. Word has length 117 [2022-11-19 06:49:56,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:49:56,725 INFO L495 AbstractCegarLoop]: Abstraction has 88 states and 122 transitions. [2022-11-19 06:49:56,725 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 120 states, 115 states have (on average 1.5391304347826087) internal successors, (177), 75 states have internal predecessors, (177), 33 states have call successors, (33), 1 states have call predecessors, (33), 30 states have return successors, (46), 45 states have call predecessors, (46), 33 states have call successors, (46) [2022-11-19 06:49:56,725 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 122 transitions. [2022-11-19 06:49:56,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-19 06:49:56,726 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:49:56,727 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 17, 15, 15, 15, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:49:56,738 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2022-11-19 06:49:56,933 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2022-11-19 06:49:56,933 INFO L420 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:49:56,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:49:56,934 INFO L85 PathProgramCache]: Analyzing trace with hash -124701254, now seen corresponding path program 27 times [2022-11-19 06:49:56,934 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:49:56,934 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1740862528] [2022-11-19 06:49:56,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:49:56,934 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:49:56,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:50:02,718 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 1 proven. 746 refuted. 0 times theorem prover too weak. 143 trivial. 0 not checked. [2022-11-19 06:50:02,719 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:50:02,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1740862528] [2022-11-19 06:50:02,719 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1740862528] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:50:02,719 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [116871549] [2022-11-19 06:50:02,719 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:50:02,719 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:50:02,720 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:50:02,722 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:50:02,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2022-11-19 06:50:03,018 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:50:03,018 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:50:03,022 WARN L261 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 205 conjunts are in the unsatisfiable core [2022-11-19 06:50:03,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:50:09,394 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 5 proven. 415 refuted. 0 times theorem prover too weak. 470 trivial. 0 not checked. [2022-11-19 06:50:09,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:50:27,540 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 17 proven. 703 refuted. 0 times theorem prover too weak. 170 trivial. 0 not checked. [2022-11-19 06:50:27,540 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [116871549] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:50:27,540 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2033765019] [2022-11-19 06:50:27,541 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:50:27,542 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:50:27,542 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:50:27,543 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:50:27,543 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 30, 39] total 109 [2022-11-19 06:50:27,543 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833394791] [2022-11-19 06:50:27,543 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:50:27,544 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2022-11-19 06:50:27,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:50:27,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2022-11-19 06:50:27,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=11388, Unknown=0, NotChecked=0, Total=11772 [2022-11-19 06:50:27,546 INFO L87 Difference]: Start difference. First operand 88 states and 122 transitions. Second operand has 109 states, 104 states have (on average 1.5192307692307692) internal successors, (158), 69 states have internal predecessors, (158), 29 states have call successors, (29), 1 states have call predecessors, (29), 28 states have return successors, (41), 40 states have call predecessors, (41), 29 states have call successors, (41) [2022-11-19 06:50:37,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:50:37,122 INFO L93 Difference]: Finished difference Result 104 states and 153 transitions. [2022-11-19 06:50:37,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2022-11-19 06:50:37,122 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 104 states have (on average 1.5192307692307692) internal successors, (158), 69 states have internal predecessors, (158), 29 states have call successors, (29), 1 states have call predecessors, (29), 28 states have return successors, (41), 40 states have call predecessors, (41), 29 states have call successors, (41) Word has length 124 [2022-11-19 06:50:37,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:50:37,123 INFO L225 Difference]: With dead ends: 104 [2022-11-19 06:50:37,124 INFO L226 Difference]: Without dead ends: 98 [2022-11-19 06:50:37,126 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 182 SyntacticMatches, 16 SemanticMatches, 139 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4287 ImplicationChecksByTransitivity, 22.6s TimeCoverageRelationStatistics Valid=1553, Invalid=18187, Unknown=0, NotChecked=0, Total=19740 [2022-11-19 06:50:37,127 INFO L413 NwaCegarLoop]: 23 mSDtfsCounter, 284 mSDsluCounter, 931 mSDsCounter, 0 mSdLazyCounter, 3828 mSolverCounterSat, 208 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 286 SdHoareTripleChecker+Valid, 954 SdHoareTripleChecker+Invalid, 4036 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 208 IncrementalHoareTripleChecker+Valid, 3828 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2022-11-19 06:50:37,127 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [286 Valid, 954 Invalid, 4036 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [208 Valid, 3828 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2022-11-19 06:50:37,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-11-19 06:50:37,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 86. [2022-11-19 06:50:37,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 58 states have (on average 1.0689655172413792) internal successors, (62), 59 states have internal predecessors, (62), 8 states have call successors, (8), 4 states have call predecessors, (8), 19 states have return successors, (48), 22 states have call predecessors, (48), 8 states have call successors, (48) [2022-11-19 06:50:37,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 118 transitions. [2022-11-19 06:50:37,146 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 118 transitions. Word has length 124 [2022-11-19 06:50:37,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:50:37,147 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 118 transitions. [2022-11-19 06:50:37,147 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 104 states have (on average 1.5192307692307692) internal successors, (158), 69 states have internal predecessors, (158), 29 states have call successors, (29), 1 states have call predecessors, (29), 28 states have return successors, (41), 40 states have call predecessors, (41), 29 states have call successors, (41) [2022-11-19 06:50:37,147 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 118 transitions. [2022-11-19 06:50:37,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2022-11-19 06:50:37,148 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:50:37,148 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 17, 15, 15, 15, 15, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:50:37,159 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2022-11-19 06:50:37,355 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:50:37,356 INFO L420 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:50:37,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:50:37,356 INFO L85 PathProgramCache]: Analyzing trace with hash 430880826, now seen corresponding path program 28 times [2022-11-19 06:50:37,356 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:50:37,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1177192585] [2022-11-19 06:50:37,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:50:37,357 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:50:37,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:50:43,192 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 0 proven. 750 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2022-11-19 06:50:43,192 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:50:43,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1177192585] [2022-11-19 06:50:43,192 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1177192585] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:50:43,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [29574864] [2022-11-19 06:50:43,193 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:50:43,193 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:50:43,193 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:50:43,194 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:50:43,197 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2022-11-19 06:50:43,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:50:43,514 WARN L261 TraceCheckSpWp]: Trace formula consists of 368 conjuncts, 205 conjunts are in the unsatisfiable core [2022-11-19 06:50:43,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:50:51,012 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 13 proven. 416 refuted. 0 times theorem prover too weak. 461 trivial. 0 not checked. [2022-11-19 06:50:51,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:51:14,116 INFO L134 CoverageAnalysis]: Checked inductivity of 890 backedges. 50 proven. 700 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2022-11-19 06:51:14,116 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [29574864] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:51:14,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1720387084] [2022-11-19 06:51:14,117 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:51:14,117 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:51:14,118 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:51:14,119 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:51:14,119 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 36, 54] total 127 [2022-11-19 06:51:14,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2070187335] [2022-11-19 06:51:14,119 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:51:14,120 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2022-11-19 06:51:14,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:51:14,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2022-11-19 06:51:14,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=15567, Unknown=0, NotChecked=0, Total=16002 [2022-11-19 06:51:14,123 INFO L87 Difference]: Start difference. First operand 86 states and 118 transitions. Second operand has 127 states, 122 states have (on average 1.540983606557377) internal successors, (188), 79 states have internal predecessors, (188), 35 states have call successors, (35), 1 states have call predecessors, (35), 32 states have return successors, (49), 48 states have call predecessors, (49), 35 states have call successors, (49) [2022-11-19 06:51:25,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:51:25,587 INFO L93 Difference]: Finished difference Result 105 states and 148 transitions. [2022-11-19 06:51:25,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2022-11-19 06:51:25,587 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 122 states have (on average 1.540983606557377) internal successors, (188), 79 states have internal predecessors, (188), 35 states have call successors, (35), 1 states have call predecessors, (35), 32 states have return successors, (49), 48 states have call predecessors, (49), 35 states have call successors, (49) Word has length 124 [2022-11-19 06:51:25,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:51:25,589 INFO L225 Difference]: With dead ends: 105 [2022-11-19 06:51:25,589 INFO L226 Difference]: Without dead ends: 99 [2022-11-19 06:51:25,592 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 343 GetRequests, 164 SyntacticMatches, 16 SemanticMatches, 163 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6235 ImplicationChecksByTransitivity, 28.1s TimeCoverageRelationStatistics Valid=2060, Invalid=25000, Unknown=0, NotChecked=0, Total=27060 [2022-11-19 06:51:25,592 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 649 mSDsluCounter, 1111 mSDsCounter, 0 mSdLazyCounter, 4252 mSolverCounterSat, 358 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 651 SdHoareTripleChecker+Valid, 1137 SdHoareTripleChecker+Invalid, 4610 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 358 IncrementalHoareTripleChecker+Valid, 4252 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.0s IncrementalHoareTripleChecker+Time [2022-11-19 06:51:25,592 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [651 Valid, 1137 Invalid, 4610 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [358 Valid, 4252 Invalid, 0 Unknown, 0 Unchecked, 6.0s Time] [2022-11-19 06:51:25,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2022-11-19 06:51:25,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 89. [2022-11-19 06:51:25,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 60 states have (on average 1.0666666666666667) internal successors, (64), 61 states have internal predecessors, (64), 8 states have call successors, (8), 4 states have call predecessors, (8), 20 states have return successors, (51), 23 states have call predecessors, (51), 8 states have call successors, (51) [2022-11-19 06:51:25,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 123 transitions. [2022-11-19 06:51:25,612 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 123 transitions. Word has length 124 [2022-11-19 06:51:25,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:51:25,613 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 123 transitions. [2022-11-19 06:51:25,613 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 122 states have (on average 1.540983606557377) internal successors, (188), 79 states have internal predecessors, (188), 35 states have call successors, (35), 1 states have call predecessors, (35), 32 states have return successors, (49), 48 states have call predecessors, (49), 35 states have call successors, (49) [2022-11-19 06:51:25,613 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 123 transitions. [2022-11-19 06:51:25,614 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2022-11-19 06:51:25,615 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:51:25,615 INFO L195 NwaCegarLoop]: trace histogram [21, 21, 21, 19, 19, 19, 19, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:51:25,626 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Ended with exit code 0 [2022-11-19 06:51:25,822 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:51:25,822 INFO L420 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:51:25,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:51:25,830 INFO L85 PathProgramCache]: Analyzing trace with hash 1105786888, now seen corresponding path program 29 times [2022-11-19 06:51:25,830 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:51:25,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1399457846] [2022-11-19 06:51:25,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:51:25,831 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:51:25,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:51:34,778 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 0 proven. 1178 refuted. 0 times theorem prover too weak. 214 trivial. 0 not checked. [2022-11-19 06:51:34,778 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:51:34,778 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1399457846] [2022-11-19 06:51:34,778 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1399457846] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:51:34,779 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1474721307] [2022-11-19 06:51:34,779 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2022-11-19 06:51:34,779 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:51:34,779 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:51:34,780 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:51:34,782 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2022-11-19 06:51:35,158 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 26 check-sat command(s) [2022-11-19 06:51:35,158 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:51:35,164 WARN L261 TraceCheckSpWp]: Trace formula consists of 444 conjuncts, 253 conjunts are in the unsatisfiable core [2022-11-19 06:51:35,167 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:51:43,825 INFO L134 CoverageAnalysis]: Checked inductivity of 1392 backedges. 14 proven. 636 refuted. 0 times theorem prover too weak. 742 trivial. 0 not checked. [2022-11-19 06:51:43,826 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:52:14,688 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1474721307] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:52:14,689 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [963264643] [2022-11-19 06:52:14,690 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:52:14,690 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:52:14,690 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:52:14,691 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:52:14,691 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 38] total 105 [2022-11-19 06:52:14,691 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364702859] [2022-11-19 06:52:14,691 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:52:14,692 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 105 states [2022-11-19 06:52:14,692 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:52:14,693 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 105 interpolants. [2022-11-19 06:52:14,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=509, Invalid=20661, Unknown=0, NotChecked=0, Total=21170 [2022-11-19 06:52:14,694 INFO L87 Difference]: Start difference. First operand 89 states and 123 transitions. Second operand has 105 states, 101 states have (on average 1.4257425742574257) internal successors, (144), 68 states have internal predecessors, (144), 23 states have call successors, (23), 1 states have call predecessors, (23), 35 states have return successors, (37), 37 states have call predecessors, (37), 23 states have call successors, (37) [2022-11-19 06:52:25,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:52:25,583 INFO L93 Difference]: Finished difference Result 102 states and 143 transitions. [2022-11-19 06:52:25,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-19 06:52:25,584 INFO L78 Accepts]: Start accepts. Automaton has has 105 states, 101 states have (on average 1.4257425742574257) internal successors, (144), 68 states have internal predecessors, (144), 23 states have call successors, (23), 1 states have call predecessors, (23), 35 states have return successors, (37), 37 states have call predecessors, (37), 23 states have call successors, (37) Word has length 152 [2022-11-19 06:52:25,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:52:25,585 INFO L225 Difference]: With dead ends: 102 [2022-11-19 06:52:25,585 INFO L226 Difference]: Without dead ends: 98 [2022-11-19 06:52:25,589 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 183 SyntacticMatches, 16 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6662 ImplicationChecksByTransitivity, 36.6s TimeCoverageRelationStatistics Valid=2180, Invalid=29682, Unknown=0, NotChecked=0, Total=31862 [2022-11-19 06:52:25,590 INFO L413 NwaCegarLoop]: 25 mSDtfsCounter, 456 mSDsluCounter, 1233 mSDsCounter, 0 mSdLazyCounter, 3971 mSolverCounterSat, 224 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 457 SdHoareTripleChecker+Valid, 1258 SdHoareTripleChecker+Invalid, 4195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 224 IncrementalHoareTripleChecker+Valid, 3971 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2022-11-19 06:52:25,590 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [457 Valid, 1258 Invalid, 4195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [224 Valid, 3971 Invalid, 0 Unknown, 0 Unchecked, 5.6s Time] [2022-11-19 06:52:25,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2022-11-19 06:52:25,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 94. [2022-11-19 06:52:25,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 63 states have (on average 1.0634920634920635) internal successors, (67), 64 states have internal predecessors, (67), 9 states have call successors, (9), 4 states have call predecessors, (9), 21 states have return successors, (60), 25 states have call predecessors, (60), 9 states have call successors, (60) [2022-11-19 06:52:25,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 136 transitions. [2022-11-19 06:52:25,618 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 136 transitions. Word has length 152 [2022-11-19 06:52:25,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:52:25,619 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 136 transitions. [2022-11-19 06:52:25,619 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 105 states, 101 states have (on average 1.4257425742574257) internal successors, (144), 68 states have internal predecessors, (144), 23 states have call successors, (23), 1 states have call predecessors, (23), 35 states have return successors, (37), 37 states have call predecessors, (37), 23 states have call successors, (37) [2022-11-19 06:52:25,619 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 136 transitions. [2022-11-19 06:52:25,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2022-11-19 06:52:25,621 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:52:25,621 INFO L195 NwaCegarLoop]: trace histogram [22, 22, 22, 20, 20, 20, 20, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:52:25,629 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2022-11-19 06:52:25,829 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:52:25,829 INFO L420 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:52:25,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:52:25,830 INFO L85 PathProgramCache]: Analyzing trace with hash 1764552570, now seen corresponding path program 30 times [2022-11-19 06:52:25,830 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:52:25,830 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630035079] [2022-11-19 06:52:25,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:52:25,830 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:52:25,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:52:34,987 INFO L134 CoverageAnalysis]: Checked inductivity of 1535 backedges. 0 proven. 1300 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2022-11-19 06:52:34,988 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:52:34,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630035079] [2022-11-19 06:52:34,988 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1630035079] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:52:34,988 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [126933301] [2022-11-19 06:52:34,988 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2022-11-19 06:52:34,988 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:52:34,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:52:34,989 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:52:34,991 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2022-11-19 06:52:35,367 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2022-11-19 06:52:35,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2022-11-19 06:52:35,372 WARN L261 TraceCheckSpWp]: Trace formula consists of 463 conjuncts, 265 conjunts are in the unsatisfiable core [2022-11-19 06:52:35,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:52:45,494 INFO L134 CoverageAnalysis]: Checked inductivity of 1535 backedges. 14 proven. 698 refuted. 0 times theorem prover too weak. 823 trivial. 0 not checked. [2022-11-19 06:52:45,494 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:53:16,989 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [126933301] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:53:16,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1397939828] [2022-11-19 06:53:16,991 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:53:16,991 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:53:16,991 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:53:16,992 INFO L184 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2022-11-19 06:53:16,992 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 38] total 108 [2022-11-19 06:53:16,992 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [97504110] [2022-11-19 06:53:16,992 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2022-11-19 06:53:16,993 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 108 states [2022-11-19 06:53:16,993 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:53:16,993 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 108 interpolants. [2022-11-19 06:53:16,995 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=521, Invalid=21531, Unknown=0, NotChecked=0, Total=22052 [2022-11-19 06:53:16,995 INFO L87 Difference]: Start difference. First operand 94 states and 136 transitions. Second operand has 108 states, 104 states have (on average 1.4326923076923077) internal successors, (149), 70 states have internal predecessors, (149), 24 states have call successors, (24), 1 states have call predecessors, (24), 36 states have return successors, (38), 38 states have call predecessors, (38), 24 states have call successors, (38) [2022-11-19 06:53:28,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2022-11-19 06:53:28,152 INFO L93 Difference]: Finished difference Result 104 states and 146 transitions. [2022-11-19 06:53:28,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2022-11-19 06:53:28,152 INFO L78 Accepts]: Start accepts. Automaton has has 108 states, 104 states have (on average 1.4326923076923077) internal successors, (149), 70 states have internal predecessors, (149), 24 states have call successors, (24), 1 states have call predecessors, (24), 36 states have return successors, (38), 38 states have call predecessors, (38), 24 states have call successors, (38) Word has length 159 [2022-11-19 06:53:28,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2022-11-19 06:53:28,154 INFO L225 Difference]: With dead ends: 104 [2022-11-19 06:53:28,154 INFO L226 Difference]: Without dead ends: 100 [2022-11-19 06:53:28,158 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 190 SyntacticMatches, 16 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6669 ImplicationChecksByTransitivity, 38.4s TimeCoverageRelationStatistics Valid=2225, Invalid=30717, Unknown=0, NotChecked=0, Total=32942 [2022-11-19 06:53:28,158 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 624 mSDsluCounter, 1351 mSDsCounter, 0 mSdLazyCounter, 3947 mSolverCounterSat, 306 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 626 SdHoareTripleChecker+Valid, 1377 SdHoareTripleChecker+Invalid, 4253 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 306 IncrementalHoareTripleChecker+Valid, 3947 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.7s IncrementalHoareTripleChecker+Time [2022-11-19 06:53:28,158 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [626 Valid, 1377 Invalid, 4253 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [306 Valid, 3947 Invalid, 0 Unknown, 0 Unchecked, 5.7s Time] [2022-11-19 06:53:28,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2022-11-19 06:53:28,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 94. [2022-11-19 06:53:28,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 63 states have (on average 1.0634920634920635) internal successors, (67), 64 states have internal predecessors, (67), 9 states have call successors, (9), 4 states have call predecessors, (9), 21 states have return successors, (60), 25 states have call predecessors, (60), 9 states have call successors, (60) [2022-11-19 06:53:28,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 136 transitions. [2022-11-19 06:53:28,181 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 136 transitions. Word has length 159 [2022-11-19 06:53:28,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2022-11-19 06:53:28,182 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 136 transitions. [2022-11-19 06:53:28,182 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 108 states, 104 states have (on average 1.4326923076923077) internal successors, (149), 70 states have internal predecessors, (149), 24 states have call successors, (24), 1 states have call predecessors, (24), 36 states have return successors, (38), 38 states have call predecessors, (38), 24 states have call successors, (38) [2022-11-19 06:53:28,182 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 136 transitions. [2022-11-19 06:53:28,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2022-11-19 06:53:28,184 INFO L187 NwaCegarLoop]: Found error trace [2022-11-19 06:53:28,184 INFO L195 NwaCegarLoop]: trace histogram [18, 18, 18, 16, 16, 16, 16, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2022-11-19 06:53:28,191 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2022-11-19 06:53:28,387 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:53:28,388 INFO L420 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2022-11-19 06:53:28,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2022-11-19 06:53:28,388 INFO L85 PathProgramCache]: Analyzing trace with hash 2065134234, now seen corresponding path program 31 times [2022-11-19 06:53:28,388 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2022-11-19 06:53:28,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741534982] [2022-11-19 06:53:28,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2022-11-19 06:53:28,389 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2022-11-19 06:53:28,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:53:35,171 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 0 proven. 848 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2022-11-19 06:53:35,171 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2022-11-19 06:53:35,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741534982] [2022-11-19 06:53:35,171 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1741534982] provided 0 perfect and 1 imperfect interpolant sequences [2022-11-19 06:53:35,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1048916793] [2022-11-19 06:53:35,171 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2022-11-19 06:53:35,172 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2022-11-19 06:53:35,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 [2022-11-19 06:53:35,176 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2022-11-19 06:53:35,179 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8b5d71c4-dfc7-42ff-8bcd-a4c437236d03/bin/utaipan-I9t0OCRTmS/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2022-11-19 06:53:35,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2022-11-19 06:53:35,570 WARN L261 TraceCheckSpWp]: Trace formula consists of 387 conjuncts, 217 conjunts are in the unsatisfiable core [2022-11-19 06:53:35,573 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2022-11-19 06:53:43,668 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 14 proven. 468 refuted. 0 times theorem prover too weak. 523 trivial. 0 not checked. [2022-11-19 06:53:43,668 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2022-11-19 06:54:09,603 INFO L134 CoverageAnalysis]: Checked inductivity of 1005 backedges. 53 proven. 795 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2022-11-19 06:54:09,603 INFO L157 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1048916793] provided 0 perfect and 2 imperfect interpolant sequences [2022-11-19 06:54:09,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1981642280] [2022-11-19 06:54:09,604 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2022-11-19 06:54:09,605 INFO L166 IcfgInterpreter]: Building call graph [2022-11-19 06:54:09,605 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:94) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:266) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:147) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:336) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2022-11-19 06:54:09,606 INFO L184 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2022-11-19 06:54:09,606 INFO L197 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 38, 57] total 134 [2022-11-19 06:54:09,606 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399267931] [2022-11-19 06:54:09,606 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2022-11-19 06:54:09,607 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 134 states [2022-11-19 06:54:09,607 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2022-11-19 06:54:09,608 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2022-11-19 06:54:09,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=459, Invalid=17363, Unknown=0, NotChecked=0, Total=17822 [2022-11-19 06:54:09,610 INFO L87 Difference]: Start difference. First operand 94 states and 136 transitions. Second operand has 134 states, 129 states have (on average 1.5426356589147288) internal successors, (199), 83 states have internal predecessors, (199), 37 states have call successors, (37), 1 states have call predecessors, (37), 34 states have return successors, (52), 51 states have call predecessors, (52), 37 states have call successors, (52)