./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/Ackermann04.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/Ackermann04.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 85f83c4bcdce9397140788b204098e14e4fa25f5b66f064340f4aaa544fbb462 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 15:08:38,911 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 15:08:38,972 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 15:08:38,976 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 15:08:38,977 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 15:08:39,001 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 15:08:39,001 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 15:08:39,002 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 15:08:39,003 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 15:08:39,003 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 15:08:39,004 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 15:08:39,004 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 15:08:39,005 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 15:08:39,005 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 15:08:39,006 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 15:08:39,006 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 15:08:39,007 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 15:08:39,007 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 15:08:39,008 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 15:08:39,008 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 15:08:39,009 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 15:08:39,011 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 15:08:39,011 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 15:08:39,012 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 15:08:39,012 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 15:08:39,012 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 15:08:39,013 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 15:08:39,013 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 15:08:39,013 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 15:08:39,013 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 15:08:39,014 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 15:08:39,014 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 15:08:39,015 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 15:08:39,015 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 15:08:39,015 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 15:08:39,015 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 15:08:39,016 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 15:08:39,016 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 15:08:39,016 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 15:08:39,016 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 15:08:39,017 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 15:08:39,017 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 15:08:39,017 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 15:08:39,017 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 15:08:39,017 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 15:08:39,018 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 15:08:39,018 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 15:08:39,018 INFO L153 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 85f83c4bcdce9397140788b204098e14e4fa25f5b66f064340f4aaa544fbb462 [2023-12-02 15:08:39,218 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 15:08:39,239 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 15:08:39,242 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 15:08:39,243 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 15:08:39,244 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 15:08:39,245 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/recursive/Ackermann04.c [2023-12-02 15:08:41,963 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 15:08:42,136 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 15:08:42,136 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/sv-benchmarks/c/recursive/Ackermann04.c [2023-12-02 15:08:42,142 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/data/7b5239fac/0e634165d9d34aadb670192141b7a4e0/FLAGd1b0ee547 [2023-12-02 15:08:42,155 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/data/7b5239fac/0e634165d9d34aadb670192141b7a4e0 [2023-12-02 15:08:42,158 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 15:08:42,160 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 15:08:42,161 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 15:08:42,161 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 15:08:42,167 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 15:08:42,167 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 03:08:42" (1/1) ... [2023-12-02 15:08:42,169 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@79c5bffa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:08:42, skipping insertion in model container [2023-12-02 15:08:42,169 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 03:08:42" (1/1) ... [2023-12-02 15:08:42,189 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 15:08:42,329 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/sv-benchmarks/c/recursive/Ackermann04.c[1166,1179] [2023-12-02 15:08:42,333 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 15:08:42,342 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 15:08:42,356 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/sv-benchmarks/c/recursive/Ackermann04.c[1166,1179] [2023-12-02 15:08:42,356 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 15:08:42,370 INFO L206 MainTranslator]: Completed translation [2023-12-02 15:08:42,371 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:08:42 WrapperNode [2023-12-02 15:08:42,371 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 15:08:42,372 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 15:08:42,372 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 15:08:42,373 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 15:08:42,379 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:08:42" (1/1) ... [2023-12-02 15:08:42,385 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:08:42" (1/1) ... [2023-12-02 15:08:42,399 INFO L138 Inliner]: procedures = 13, calls = 11, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 33 [2023-12-02 15:08:42,399 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 15:08:42,400 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 15:08:42,400 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 15:08:42,400 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 15:08:42,408 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:08:42" (1/1) ... [2023-12-02 15:08:42,409 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:08:42" (1/1) ... [2023-12-02 15:08:42,410 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:08:42" (1/1) ... [2023-12-02 15:08:42,410 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:08:42" (1/1) ... [2023-12-02 15:08:42,413 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:08:42" (1/1) ... [2023-12-02 15:08:42,415 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:08:42" (1/1) ... [2023-12-02 15:08:42,416 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:08:42" (1/1) ... [2023-12-02 15:08:42,417 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:08:42" (1/1) ... [2023-12-02 15:08:42,418 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 15:08:42,419 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 15:08:42,420 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 15:08:42,420 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 15:08:42,421 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:08:42" (1/1) ... [2023-12-02 15:08:42,427 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 15:08:42,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:08:42,455 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 15:08:42,461 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 15:08:42,491 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 15:08:42,492 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 15:08:42,492 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 15:08:42,492 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2023-12-02 15:08:42,492 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2023-12-02 15:08:42,492 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 15:08:42,558 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 15:08:42,560 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 15:08:42,678 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 15:08:42,694 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 15:08:42,694 INFO L309 CfgBuilder]: Removed 0 assume(true) statements. [2023-12-02 15:08:42,695 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 03:08:42 BoogieIcfgContainer [2023-12-02 15:08:42,695 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 15:08:42,699 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 15:08:42,699 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 15:08:42,702 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 15:08:42,702 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 03:08:42" (1/3) ... [2023-12-02 15:08:42,703 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@354c232c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 03:08:42, skipping insertion in model container [2023-12-02 15:08:42,703 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 03:08:42" (2/3) ... [2023-12-02 15:08:42,704 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@354c232c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 03:08:42, skipping insertion in model container [2023-12-02 15:08:42,704 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 03:08:42" (3/3) ... [2023-12-02 15:08:42,705 INFO L112 eAbstractionObserver]: Analyzing ICFG Ackermann04.c [2023-12-02 15:08:42,723 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 15:08:42,723 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 15:08:42,763 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 15:08:42,769 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@4247088, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 15:08:42,769 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 15:08:42,772 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) [2023-12-02 15:08:42,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 15:08:42,778 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:08:42,779 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:08:42,779 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:08:42,784 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:08:42,784 INFO L85 PathProgramCache]: Analyzing trace with hash 1538870455, now seen corresponding path program 1 times [2023-12-02 15:08:42,794 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:08:42,795 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2038623791] [2023-12-02 15:08:42,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:08:42,795 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:08:42,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:08:43,055 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 15:08:43,056 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:08:43,056 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2038623791] [2023-12-02 15:08:43,057 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2038623791] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 15:08:43,057 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 15:08:43,057 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-12-02 15:08:43,058 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368408732] [2023-12-02 15:08:43,059 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 15:08:43,062 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 15:08:43,062 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:08:43,092 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 15:08:43,092 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-12-02 15:08:43,094 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 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-12-02 15:08:43,207 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:08:43,207 INFO L93 Difference]: Finished difference Result 33 states and 45 transitions. [2023-12-02 15:08:43,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 15:08:43,210 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2023-12-02 15:08:43,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:08:43,217 INFO L225 Difference]: With dead ends: 33 [2023-12-02 15:08:43,217 INFO L226 Difference]: Without dead ends: 24 [2023-12-02 15:08:43,220 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-12-02 15:08:43,223 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 13 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:08:43,225 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 52 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:08:43,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-12-02 15:08:43,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-12-02 15:08:43,257 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) [2023-12-02 15:08:43,259 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2023-12-02 15:08:43,260 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 11 [2023-12-02 15:08:43,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:08:43,261 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2023-12-02 15:08:43,261 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-12-02 15:08:43,261 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2023-12-02 15:08:43,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-12-02 15:08:43,263 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:08:43,263 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:08:43,264 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 15:08:43,264 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:08:43,265 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:08:43,265 INFO L85 PathProgramCache]: Analyzing trace with hash -108557995, now seen corresponding path program 1 times [2023-12-02 15:08:43,265 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:08:43,265 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1198314229] [2023-12-02 15:08:43,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:08:43,266 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:08:43,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:08:43,373 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 15:08:43,373 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:08:43,373 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1198314229] [2023-12-02 15:08:43,373 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1198314229] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:08:43,374 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [804277876] [2023-12-02 15:08:43,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:08:43,374 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:08:43,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:08:43,380 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:08:43,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 15:08:43,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:08:43,435 INFO L262 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 15:08:43,441 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:08:43,493 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 15:08:43,494 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:08:43,587 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 15:08:43,587 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [804277876] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:08:43,587 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1018085613] [2023-12-02 15:08:43,605 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-12-02 15:08:43,606 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:08:43,609 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 15:08:43,610 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:08:43,610 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-12-02 15:08:43,611 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1835466073] [2023-12-02 15:08:43,611 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:08:43,612 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 15:08:43,612 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:08:43,613 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 15:08:43,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2023-12-02 15:08:43,614 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-12-02 15:08:43,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:08:43,728 INFO L93 Difference]: Finished difference Result 64 states and 114 transitions. [2023-12-02 15:08:43,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 15:08:43,729 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 18 [2023-12-02 15:08:43,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:08:43,732 INFO L225 Difference]: With dead ends: 64 [2023-12-02 15:08:43,732 INFO L226 Difference]: Without dead ends: 40 [2023-12-02 15:08:43,734 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2023-12-02 15:08:43,735 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 13 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 89 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:08:43,736 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 60 Invalid, 89 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:08:43,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2023-12-02 15:08:43,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2023-12-02 15:08:43,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 26 states have (on average 1.1538461538461537) internal successors, (30), 27 states have internal predecessors, (30), 8 states have call successors, (8), 2 states have call predecessors, (8), 5 states have return successors, (27), 10 states have call predecessors, (27), 8 states have call successors, (27) [2023-12-02 15:08:43,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 65 transitions. [2023-12-02 15:08:43,752 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 65 transitions. Word has length 18 [2023-12-02 15:08:43,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:08:43,752 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 65 transitions. [2023-12-02 15:08:43,753 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 3 states have call successors, (3), 1 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-12-02 15:08:43,753 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 65 transitions. [2023-12-02 15:08:43,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-12-02 15:08:43,757 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:08:43,757 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:08:43,768 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 15:08:43,960 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-12-02 15:08:43,960 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:08:43,961 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:08:43,961 INFO L85 PathProgramCache]: Analyzing trace with hash 1262121361, now seen corresponding path program 1 times [2023-12-02 15:08:43,961 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:08:43,961 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1205737723] [2023-12-02 15:08:43,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:08:43,962 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:08:43,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:08:44,153 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 15:08:44,154 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:08:44,154 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1205737723] [2023-12-02 15:08:44,154 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1205737723] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:08:44,154 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396696972] [2023-12-02 15:08:44,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:08:44,155 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:08:44,155 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:08:44,156 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:08:44,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 15:08:44,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:08:44,214 INFO L262 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 10 conjunts are in the unsatisfiable core [2023-12-02 15:08:44,217 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:08:44,286 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2023-12-02 15:08:44,286 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:08:44,849 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 6 proven. 27 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2023-12-02 15:08:44,849 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1396696972] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:08:44,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1502213370] [2023-12-02 15:08:44,853 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-12-02 15:08:44,853 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:08:44,853 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 15:08:44,854 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:08:44,854 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 8 [2023-12-02 15:08:44,854 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715508868] [2023-12-02 15:08:44,854 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:08:44,855 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 15:08:44,855 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:08:44,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 15:08:44,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2023-12-02 15:08:44,856 INFO L87 Difference]: Start difference. First operand 40 states and 65 transitions. Second operand has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 4 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 2 states have call predecessors, (6), 4 states have call successors, (6) [2023-12-02 15:08:44,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:08:44,937 INFO L93 Difference]: Finished difference Result 57 states and 112 transitions. [2023-12-02 15:08:44,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 15:08:44,938 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 4 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 2 states have call predecessors, (6), 4 states have call successors, (6) Word has length 44 [2023-12-02 15:08:44,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:08:44,942 INFO L225 Difference]: With dead ends: 57 [2023-12-02 15:08:44,942 INFO L226 Difference]: Without dead ends: 53 [2023-12-02 15:08:44,943 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 88 SyntacticMatches, 5 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2023-12-02 15:08:44,944 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 14 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 15:08:44,945 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 52 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 15:08:44,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2023-12-02 15:08:44,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2023-12-02 15:08:44,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 34 states have (on average 1.1176470588235294) internal successors, (38), 35 states have internal predecessors, (38), 10 states have call successors, (10), 2 states have call predecessors, (10), 8 states have return successors, (60), 15 states have call predecessors, (60), 10 states have call successors, (60) [2023-12-02 15:08:44,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 108 transitions. [2023-12-02 15:08:44,965 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 108 transitions. Word has length 44 [2023-12-02 15:08:44,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:08:44,965 INFO L495 AbstractCegarLoop]: Abstraction has 53 states and 108 transitions. [2023-12-02 15:08:44,965 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 4 states have call successors, (6), 1 states have call predecessors, (6), 3 states have return successors, (6), 2 states have call predecessors, (6), 4 states have call successors, (6) [2023-12-02 15:08:44,965 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 108 transitions. [2023-12-02 15:08:44,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2023-12-02 15:08:44,973 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:08:44,973 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 11, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:08:44,979 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 15:08:45,176 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:08:45,176 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:08:45,176 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:08:45,177 INFO L85 PathProgramCache]: Analyzing trace with hash -1462639456, now seen corresponding path program 2 times [2023-12-02 15:08:45,177 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:08:45,177 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1528625341] [2023-12-02 15:08:45,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:08:45,177 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:08:45,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:08:45,624 INFO L134 CoverageAnalysis]: Checked inductivity of 669 backedges. 124 proven. 289 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2023-12-02 15:08:45,624 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:08:45,624 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1528625341] [2023-12-02 15:08:45,624 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1528625341] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:08:45,624 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [183710189] [2023-12-02 15:08:45,625 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 15:08:45,625 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:08:45,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:08:45,626 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:08:45,629 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 15:08:45,731 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2023-12-02 15:08:45,731 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 15:08:45,735 INFO L262 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 19 conjunts are in the unsatisfiable core [2023-12-02 15:08:45,740 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:08:45,929 INFO L134 CoverageAnalysis]: Checked inductivity of 669 backedges. 182 proven. 101 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2023-12-02 15:08:45,929 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:08:47,924 INFO L134 CoverageAnalysis]: Checked inductivity of 669 backedges. 202 proven. 86 refuted. 0 times theorem prover too weak. 381 trivial. 0 not checked. [2023-12-02 15:08:47,924 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [183710189] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:08:47,924 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1838449057] [2023-12-02 15:08:47,927 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-12-02 15:08:47,927 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:08:47,928 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 15:08:47,928 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:08:47,928 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 15] total 33 [2023-12-02 15:08:47,928 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031654120] [2023-12-02 15:08:47,929 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:08:47,930 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-12-02 15:08:47,930 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:08:47,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-12-02 15:08:47,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=950, Unknown=0, NotChecked=0, Total=1056 [2023-12-02 15:08:47,932 INFO L87 Difference]: Start difference. First operand 53 states and 108 transitions. Second operand has 33 states, 33 states have (on average 2.212121212121212) internal successors, (73), 27 states have internal predecessors, (73), 12 states have call successors, (17), 1 states have call predecessors, (17), 16 states have return successors, (31), 18 states have call predecessors, (31), 12 states have call successors, (31) [2023-12-02 15:08:48,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:08:48,928 INFO L93 Difference]: Finished difference Result 143 states and 410 transitions. [2023-12-02 15:08:48,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-12-02 15:08:48,929 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.212121212121212) internal successors, (73), 27 states have internal predecessors, (73), 12 states have call successors, (17), 1 states have call predecessors, (17), 16 states have return successors, (31), 18 states have call predecessors, (31), 12 states have call successors, (31) Word has length 118 [2023-12-02 15:08:48,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:08:48,933 INFO L225 Difference]: With dead ends: 143 [2023-12-02 15:08:48,933 INFO L226 Difference]: Without dead ends: 81 [2023-12-02 15:08:48,939 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 283 GetRequests, 221 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 700 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=684, Invalid=3222, Unknown=0, NotChecked=0, Total=3906 [2023-12-02 15:08:48,940 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 114 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 696 mSolverCounterSat, 119 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 815 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 119 IncrementalHoareTripleChecker+Valid, 696 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:08:48,941 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 172 Invalid, 815 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [119 Valid, 696 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 15:08:48,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-12-02 15:08:48,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2023-12-02 15:08:48,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 51 states have (on average 1.1568627450980393) internal successors, (59), 54 states have internal predecessors, (59), 15 states have call successors, (15), 7 states have call predecessors, (15), 11 states have return successors, (68), 16 states have call predecessors, (68), 15 states have call successors, (68) [2023-12-02 15:08:48,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 142 transitions. [2023-12-02 15:08:48,962 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 142 transitions. Word has length 118 [2023-12-02 15:08:48,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:08:48,962 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 142 transitions. [2023-12-02 15:08:48,963 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.212121212121212) internal successors, (73), 27 states have internal predecessors, (73), 12 states have call successors, (17), 1 states have call predecessors, (17), 16 states have return successors, (31), 18 states have call predecessors, (31), 12 states have call successors, (31) [2023-12-02 15:08:48,963 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 142 transitions. [2023-12-02 15:08:48,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2023-12-02 15:08:48,966 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:08:48,966 INFO L195 NwaCegarLoop]: trace histogram [17, 17, 10, 7, 6, 6, 6, 6, 6, 6, 6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:08:48,971 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 15:08:49,171 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:08:49,172 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:08:49,172 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:08:49,172 INFO L85 PathProgramCache]: Analyzing trace with hash -1076207297, now seen corresponding path program 3 times [2023-12-02 15:08:49,172 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:08:49,172 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1096405991] [2023-12-02 15:08:49,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:08:49,172 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:08:49,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:08:49,598 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 118 proven. 220 refuted. 0 times theorem prover too weak. 323 trivial. 0 not checked. [2023-12-02 15:08:49,598 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:08:49,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1096405991] [2023-12-02 15:08:49,598 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1096405991] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:08:49,599 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1803101857] [2023-12-02 15:08:49,599 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 15:08:49,599 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:08:49,599 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:08:49,602 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:08:49,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 15:08:49,721 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 15:08:49,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 15:08:49,726 INFO L262 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 21 conjunts are in the unsatisfiable core [2023-12-02 15:08:49,731 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:08:49,818 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 236 proven. 115 refuted. 0 times theorem prover too weak. 310 trivial. 0 not checked. [2023-12-02 15:08:49,818 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:08:51,244 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 252 proven. 113 refuted. 0 times theorem prover too weak. 296 trivial. 0 not checked. [2023-12-02 15:08:51,244 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1803101857] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:08:51,244 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [56469094] [2023-12-02 15:08:51,247 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-12-02 15:08:51,247 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:08:51,247 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 15:08:51,248 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:08:51,248 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 13, 16] total 21 [2023-12-02 15:08:51,248 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849471264] [2023-12-02 15:08:51,248 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:08:51,249 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-12-02 15:08:51,249 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:08:51,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-12-02 15:08:51,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2023-12-02 15:08:51,251 INFO L87 Difference]: Start difference. First operand 78 states and 142 transitions. Second operand has 21 states, 21 states have (on average 2.619047619047619) internal successors, (55), 18 states have internal predecessors, (55), 10 states have call successors, (13), 1 states have call predecessors, (13), 11 states have return successors, (24), 10 states have call predecessors, (24), 10 states have call successors, (24) [2023-12-02 15:08:52,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:08:52,036 INFO L93 Difference]: Finished difference Result 236 states and 534 transitions. [2023-12-02 15:08:52,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2023-12-02 15:08:52,037 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 2.619047619047619) internal successors, (55), 18 states have internal predecessors, (55), 10 states have call successors, (13), 1 states have call predecessors, (13), 11 states have return successors, (24), 10 states have call predecessors, (24), 10 states have call successors, (24) Word has length 117 [2023-12-02 15:08:52,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:08:52,042 INFO L225 Difference]: With dead ends: 236 [2023-12-02 15:08:52,042 INFO L226 Difference]: Without dead ends: 151 [2023-12-02 15:08:52,045 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 220 SyntacticMatches, 11 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 715 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=689, Invalid=2281, Unknown=0, NotChecked=0, Total=2970 [2023-12-02 15:08:52,046 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 55 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 339 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 415 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 339 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-12-02 15:08:52,046 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 135 Invalid, 415 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 339 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-12-02 15:08:52,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2023-12-02 15:08:52,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 115. [2023-12-02 15:08:52,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 75 states have (on average 1.12) internal successors, (84), 77 states have internal predecessors, (84), 22 states have call successors, (22), 9 states have call predecessors, (22), 17 states have return successors, (73), 28 states have call predecessors, (73), 22 states have call successors, (73) [2023-12-02 15:08:52,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 179 transitions. [2023-12-02 15:08:52,077 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 179 transitions. Word has length 117 [2023-12-02 15:08:52,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:08:52,078 INFO L495 AbstractCegarLoop]: Abstraction has 115 states and 179 transitions. [2023-12-02 15:08:52,078 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 2.619047619047619) internal successors, (55), 18 states have internal predecessors, (55), 10 states have call successors, (13), 1 states have call predecessors, (13), 11 states have return successors, (24), 10 states have call predecessors, (24), 10 states have call successors, (24) [2023-12-02 15:08:52,078 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 179 transitions. [2023-12-02 15:08:52,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-12-02 15:08:52,081 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:08:52,081 INFO L195 NwaCegarLoop]: trace histogram [23, 23, 13, 10, 9, 9, 9, 9, 9, 9, 9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:08:52,086 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 15:08:52,281 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:08:52,282 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:08:52,282 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:08:52,282 INFO L85 PathProgramCache]: Analyzing trace with hash -511219076, now seen corresponding path program 4 times [2023-12-02 15:08:52,282 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:08:52,283 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [754842818] [2023-12-02 15:08:52,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:08:52,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:08:52,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:08:53,107 INFO L134 CoverageAnalysis]: Checked inductivity of 1246 backedges. 439 proven. 281 refuted. 0 times theorem prover too weak. 526 trivial. 0 not checked. [2023-12-02 15:08:53,107 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:08:53,107 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [754842818] [2023-12-02 15:08:53,107 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [754842818] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:08:53,107 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [863443791] [2023-12-02 15:08:53,108 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 15:08:53,108 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:08:53,108 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:08:53,109 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:08:53,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 15:08:53,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:08:53,277 INFO L262 TraceCheckSpWp]: Trace formula consists of 476 conjuncts, 35 conjunts are in the unsatisfiable core [2023-12-02 15:08:53,285 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:08:53,411 INFO L134 CoverageAnalysis]: Checked inductivity of 1246 backedges. 421 proven. 286 refuted. 0 times theorem prover too weak. 539 trivial. 0 not checked. [2023-12-02 15:08:53,411 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:08:57,509 INFO L134 CoverageAnalysis]: Checked inductivity of 1246 backedges. 467 proven. 286 refuted. 0 times theorem prover too weak. 493 trivial. 0 not checked. [2023-12-02 15:08:57,509 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [863443791] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:08:57,509 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2113847376] [2023-12-02 15:08:57,511 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-12-02 15:08:57,511 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:08:57,511 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 15:08:57,511 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:08:57,512 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 20, 27] total 35 [2023-12-02 15:08:57,512 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1991810811] [2023-12-02 15:08:57,512 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:08:57,512 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-12-02 15:08:57,512 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:08:57,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-12-02 15:08:57,514 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=1038, Unknown=0, NotChecked=0, Total=1190 [2023-12-02 15:08:57,514 INFO L87 Difference]: Start difference. First operand 115 states and 179 transitions. Second operand has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 29 states have internal predecessors, (74), 14 states have call successors, (17), 1 states have call predecessors, (17), 17 states have return successors, (32), 17 states have call predecessors, (32), 14 states have call successors, (32) [2023-12-02 15:08:58,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:08:58,805 INFO L93 Difference]: Finished difference Result 293 states and 531 transitions. [2023-12-02 15:08:58,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2023-12-02 15:08:58,806 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 29 states have internal predecessors, (74), 14 states have call successors, (17), 1 states have call predecessors, (17), 17 states have return successors, (32), 17 states have call predecessors, (32), 14 states have call successors, (32) Word has length 156 [2023-12-02 15:08:58,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:08:58,810 INFO L225 Difference]: With dead ends: 293 [2023-12-02 15:08:58,810 INFO L226 Difference]: Without dead ends: 186 [2023-12-02 15:08:58,815 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 295 SyntacticMatches, 14 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1993 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1514, Invalid=5968, Unknown=0, NotChecked=0, Total=7482 [2023-12-02 15:08:58,816 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 86 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 790 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 242 SdHoareTripleChecker+Invalid, 913 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 790 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:08:58,817 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 242 Invalid, 913 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 790 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 15:08:58,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2023-12-02 15:08:58,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 143. [2023-12-02 15:08:58,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 91 states have (on average 1.098901098901099) internal successors, (100), 93 states have internal predecessors, (100), 30 states have call successors, (30), 9 states have call predecessors, (30), 21 states have return successors, (108), 40 states have call predecessors, (108), 30 states have call successors, (108) [2023-12-02 15:08:58,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 238 transitions. [2023-12-02 15:08:58,849 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 238 transitions. Word has length 156 [2023-12-02 15:08:58,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:08:58,850 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 238 transitions. [2023-12-02 15:08:58,851 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.1142857142857143) internal successors, (74), 29 states have internal predecessors, (74), 14 states have call successors, (17), 1 states have call predecessors, (17), 17 states have return successors, (32), 17 states have call predecessors, (32), 14 states have call successors, (32) [2023-12-02 15:08:58,851 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 238 transitions. [2023-12-02 15:08:58,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2023-12-02 15:08:58,854 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:08:58,854 INFO L195 NwaCegarLoop]: trace histogram [25, 25, 14, 11, 10, 10, 10, 10, 10, 10, 10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:08:58,860 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-12-02 15:08:59,056 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-12-02 15:08:59,056 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:08:59,056 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:08:59,057 INFO L85 PathProgramCache]: Analyzing trace with hash -1922447937, now seen corresponding path program 5 times [2023-12-02 15:08:59,057 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:08:59,057 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924284106] [2023-12-02 15:08:59,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:08:59,057 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:08:59,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:08:59,714 INFO L134 CoverageAnalysis]: Checked inductivity of 1483 backedges. 495 proven. 368 refuted. 0 times theorem prover too weak. 620 trivial. 0 not checked. [2023-12-02 15:08:59,714 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:08:59,714 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924284106] [2023-12-02 15:08:59,714 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [924284106] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:08:59,714 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1382553945] [2023-12-02 15:08:59,715 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 15:08:59,715 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:08:59,715 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:08:59,716 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:08:59,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 15:08:59,938 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2023-12-02 15:08:59,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 15:08:59,941 INFO L262 TraceCheckSpWp]: Trace formula consists of 488 conjuncts, 37 conjunts are in the unsatisfiable core [2023-12-02 15:08:59,945 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:09:00,041 INFO L134 CoverageAnalysis]: Checked inductivity of 1483 backedges. 477 proven. 372 refuted. 0 times theorem prover too weak. 634 trivial. 0 not checked. [2023-12-02 15:09:00,041 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:09:04,188 INFO L134 CoverageAnalysis]: Checked inductivity of 1483 backedges. 525 proven. 384 refuted. 0 times theorem prover too weak. 574 trivial. 0 not checked. [2023-12-02 15:09:04,189 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1382553945] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:09:04,189 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [330388732] [2023-12-02 15:09:04,191 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-12-02 15:09:04,191 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:09:04,191 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 15:09:04,192 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:09:04,192 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 21, 28] total 32 [2023-12-02 15:09:04,192 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706612827] [2023-12-02 15:09:04,192 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:09:04,193 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2023-12-02 15:09:04,193 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:09:04,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2023-12-02 15:09:04,194 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=854, Unknown=0, NotChecked=0, Total=992 [2023-12-02 15:09:04,195 INFO L87 Difference]: Start difference. First operand 143 states and 238 transitions. Second operand has 32 states, 32 states have (on average 2.34375) internal successors, (75), 28 states have internal predecessors, (75), 15 states have call successors, (18), 1 states have call predecessors, (18), 17 states have return successors, (32), 15 states have call predecessors, (32), 15 states have call successors, (32) [2023-12-02 15:09:05,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:09:05,393 INFO L93 Difference]: Finished difference Result 345 states and 661 transitions. [2023-12-02 15:09:05,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2023-12-02 15:09:05,394 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.34375) internal successors, (75), 28 states have internal predecessors, (75), 15 states have call successors, (18), 1 states have call predecessors, (18), 17 states have return successors, (32), 15 states have call predecessors, (32), 15 states have call successors, (32) Word has length 169 [2023-12-02 15:09:05,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:09:05,399 INFO L225 Difference]: With dead ends: 345 [2023-12-02 15:09:05,399 INFO L226 Difference]: Without dead ends: 210 [2023-12-02 15:09:05,403 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 427 GetRequests, 321 SyntacticMatches, 19 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2277 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1635, Invalid=6197, Unknown=0, NotChecked=0, Total=7832 [2023-12-02 15:09:05,404 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 66 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 729 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 839 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 729 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 15:09:05,405 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [66 Valid, 234 Invalid, 839 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 729 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 15:09:05,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 210 states. [2023-12-02 15:09:05,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 210 to 158. [2023-12-02 15:09:05,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 100 states have (on average 1.09) internal successors, (109), 102 states have internal predecessors, (109), 33 states have call successors, (33), 9 states have call predecessors, (33), 24 states have return successors, (133), 46 states have call predecessors, (133), 33 states have call successors, (133) [2023-12-02 15:09:05,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 275 transitions. [2023-12-02 15:09:05,431 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 275 transitions. Word has length 169 [2023-12-02 15:09:05,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:09:05,431 INFO L495 AbstractCegarLoop]: Abstraction has 158 states and 275 transitions. [2023-12-02 15:09:05,432 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.34375) internal successors, (75), 28 states have internal predecessors, (75), 15 states have call successors, (18), 1 states have call predecessors, (18), 17 states have return successors, (32), 15 states have call predecessors, (32), 15 states have call successors, (32) [2023-12-02 15:09:05,432 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 275 transitions. [2023-12-02 15:09:05,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 183 [2023-12-02 15:09:05,434 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 15:09:05,434 INFO L195 NwaCegarLoop]: trace histogram [27, 27, 15, 12, 11, 11, 11, 11, 11, 11, 11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 15:09:05,439 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 15:09:05,634 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:09:05,635 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 15:09:05,635 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 15:09:05,635 INFO L85 PathProgramCache]: Analyzing trace with hash -2140695240, now seen corresponding path program 6 times [2023-12-02 15:09:05,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 15:09:05,635 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [849993557] [2023-12-02 15:09:05,635 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 15:09:05,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 15:09:05,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 15:09:06,382 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 681 proven. 75 refuted. 0 times theorem prover too weak. 985 trivial. 0 not checked. [2023-12-02 15:09:06,382 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 15:09:06,382 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [849993557] [2023-12-02 15:09:06,382 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [849993557] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 15:09:06,382 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [4502963] [2023-12-02 15:09:06,382 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 15:09:06,382 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:09:06,382 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 15:09:06,383 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 15:09:06,384 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 15:09:06,583 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 15:09:06,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 15:09:06,587 INFO L262 TraceCheckSpWp]: Trace formula consists of 552 conjuncts, 40 conjunts are in the unsatisfiable core [2023-12-02 15:09:06,590 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 15:09:06,653 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 657 proven. 84 refuted. 0 times theorem prover too weak. 1000 trivial. 0 not checked. [2023-12-02 15:09:06,653 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 15:09:13,679 INFO L134 CoverageAnalysis]: Checked inductivity of 1741 backedges. 711 proven. 75 refuted. 0 times theorem prover too weak. 955 trivial. 0 not checked. [2023-12-02 15:09:13,679 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [4502963] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 15:09:13,679 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1557482149] [2023-12-02 15:09:13,680 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-12-02 15:09:13,681 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 15:09:13,681 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-12-02 15:09:13,681 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 15:09:13,681 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 23, 33] total 37 [2023-12-02 15:09:13,681 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131175019] [2023-12-02 15:09:13,681 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 15:09:13,682 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2023-12-02 15:09:13,682 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 15:09:13,682 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2023-12-02 15:09:13,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1184, Unknown=0, NotChecked=0, Total=1332 [2023-12-02 15:09:13,683 INFO L87 Difference]: Start difference. First operand 158 states and 275 transitions. Second operand has 37 states, 37 states have (on average 1.5135135135135136) internal successors, (56), 30 states have internal predecessors, (56), 6 states have call successors, (9), 1 states have call predecessors, (9), 15 states have return successors, (23), 13 states have call predecessors, (23), 6 states have call successors, (23) [2023-12-02 15:09:15,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 15:09:15,404 INFO L93 Difference]: Finished difference Result 256 states and 421 transitions. [2023-12-02 15:09:15,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2023-12-02 15:09:15,404 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 1.5135135135135136) internal successors, (56), 30 states have internal predecessors, (56), 6 states have call successors, (9), 1 states have call predecessors, (9), 15 states have return successors, (23), 13 states have call predecessors, (23), 6 states have call successors, (23) Word has length 182 [2023-12-02 15:09:15,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 15:09:15,405 INFO L225 Difference]: With dead ends: 256 [2023-12-02 15:09:15,405 INFO L226 Difference]: Without dead ends: 0 [2023-12-02 15:09:15,410 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 342 SyntacticMatches, 20 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1973 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1317, Invalid=5655, Unknown=0, NotChecked=0, Total=6972 [2023-12-02 15:09:15,410 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 79 mSDsluCounter, 205 mSDsCounter, 0 mSdLazyCounter, 1289 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 231 SdHoareTripleChecker+Invalid, 1391 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 1289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-12-02 15:09:15,410 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [79 Valid, 231 Invalid, 1391 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 1289 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-12-02 15:09:15,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2023-12-02 15:09:15,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2023-12-02 15:09:15,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 15:09:15,411 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2023-12-02 15:09:15,411 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 182 [2023-12-02 15:09:15,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 15:09:15,412 INFO L495 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2023-12-02 15:09:15,412 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 1.5135135135135136) internal successors, (56), 30 states have internal predecessors, (56), 6 states have call successors, (9), 1 states have call predecessors, (9), 15 states have return successors, (23), 13 states have call predecessors, (23), 6 states have call successors, (23) [2023-12-02 15:09:15,412 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2023-12-02 15:09:15,412 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2023-12-02 15:09:15,414 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-12-02 15:09:15,419 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 15:09:15,614 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 15:09:15,616 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2023-12-02 15:09:19,983 INFO L899 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2023-12-02 15:09:19,983 INFO L899 garLoopResultBuilder]: For program point L29(lines 29 33) no Hoare annotation was computed. [2023-12-02 15:09:19,983 INFO L899 garLoopResultBuilder]: For program point L27(lines 27 47) no Hoare annotation was computed. [2023-12-02 15:09:19,983 INFO L899 garLoopResultBuilder]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 45) no Hoare annotation was computed. [2023-12-02 15:09:19,983 INFO L899 garLoopResultBuilder]: For program point L45(line 45) no Hoare annotation was computed. [2023-12-02 15:09:19,983 INFO L899 garLoopResultBuilder]: For program point L42(lines 42 46) no Hoare annotation was computed. [2023-12-02 15:09:19,983 INFO L899 garLoopResultBuilder]: For program point $Ultimate##0(line -1) no Hoare annotation was computed. [2023-12-02 15:09:19,984 INFO L902 garLoopResultBuilder]: At program point L41(line 41) the Hoare annotation is: true [2023-12-02 15:09:19,984 INFO L899 garLoopResultBuilder]: For program point L41-1(line 41) no Hoare annotation was computed. [2023-12-02 15:09:19,984 INFO L899 garLoopResultBuilder]: For program point L35(lines 35 40) no Hoare annotation was computed. [2023-12-02 15:09:19,984 INFO L899 garLoopResultBuilder]: For program point ackermannEXIT(lines 16 24) no Hoare annotation was computed. [2023-12-02 15:09:19,984 INFO L895 garLoopResultBuilder]: At program point L23(line 23) the Hoare annotation is: (and (<= |ackermann_#in~n| ackermann_~n) (= ackermann_~m |ackermann_#in~m|) (or (= ackermann_~n 1) (= ackermann_~n |ackermann_#in~n|)) (not (= |ackermann_#in~m| 0))) [2023-12-02 15:09:19,985 INFO L899 garLoopResultBuilder]: For program point L23-1(line 23) no Hoare annotation was computed. [2023-12-02 15:09:19,985 INFO L895 garLoopResultBuilder]: At program point L21(line 21) the Hoare annotation is: (and (= ackermann_~m |ackermann_#in~m|) (or (= ackermann_~n 1) (= ackermann_~n |ackermann_#in~n|)) (not (= |ackermann_#in~m| 0)) (<= |ackermann_#in~n| 0)) [2023-12-02 15:09:19,985 INFO L895 garLoopResultBuilder]: At program point L23-2(line 23) the Hoare annotation is: (let ((.cse3 (<= 3 |ackermann_#t~ret5|)) (.cse0 (<= 5 |ackermann_#t~ret5|)) (.cse6 (= |ackermann_#in~m| 1)) (.cse7 (<= 6 |ackermann_#t~ret5|)) (.cse5 (<= |ackermann_#in~n| 1))) (and (let ((.cse2 (<= 2 |ackermann_#in~m|)) (.cse4 (= ackermann_~m |ackermann_#in~m|)) (.cse1 (or (= ackermann_~n 1) (= ackermann_~n |ackermann_#in~n|)))) (or (and (= |ackermann_#in~m| 2) .cse0 (= ackermann_~m 2) .cse1) (and .cse2 .cse3 .cse4 .cse1 .cse5) (and (= ackermann_~m 1) (<= 2 |ackermann_#t~ret5|) .cse1 .cse6) (and .cse7 .cse2 .cse4 .cse1))) (let ((.cse8 (<= |ackermann_#in~n| ackermann_~n))) (or (and .cse8 (<= |ackermann_#in~n| 2) .cse3) (and .cse8 (<= |ackermann_#in~n| 3) (<= 4 |ackermann_#t~ret5|) .cse6) (and .cse8 .cse0 (<= |ackermann_#in~n| 4) .cse6) (and .cse8 .cse7) .cse5)))) [2023-12-02 15:09:19,985 INFO L899 garLoopResultBuilder]: For program point L20(lines 20 22) no Hoare annotation was computed. [2023-12-02 15:09:19,985 INFO L899 garLoopResultBuilder]: For program point L21-1(line 21) no Hoare annotation was computed. [2023-12-02 15:09:19,986 INFO L899 garLoopResultBuilder]: For program point L23-3(line 23) no Hoare annotation was computed. [2023-12-02 15:09:19,986 INFO L899 garLoopResultBuilder]: For program point L17(lines 17 19) no Hoare annotation was computed. [2023-12-02 15:09:19,986 INFO L902 garLoopResultBuilder]: At program point $Ultimate##0(lines 16 24) the Hoare annotation is: true [2023-12-02 15:09:19,986 INFO L899 garLoopResultBuilder]: For program point ackermannFINAL(lines 16 24) no Hoare annotation was computed. [2023-12-02 15:09:19,989 INFO L445 BasicCegarLoop]: Path program histogram: [6, 1, 1] [2023-12-02 15:09:19,991 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2023-12-02 15:09:19,995 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.12 03:09:19 BoogieIcfgContainer [2023-12-02 15:09:19,995 INFO L131 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2023-12-02 15:09:19,995 INFO L112 PluginConnector]: ------------------------Witness Printer---------------------------- [2023-12-02 15:09:19,995 INFO L270 PluginConnector]: Initializing Witness Printer... [2023-12-02 15:09:19,996 INFO L274 PluginConnector]: Witness Printer initialized [2023-12-02 15:09:19,996 INFO L184 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 03:08:42" (3/4) ... [2023-12-02 15:09:19,998 INFO L137 WitnessPrinter]: Generating witness for correct program [2023-12-02 15:09:20,001 INFO L361 RCFGBacktranslator]: Ignoring RootEdge to procedure ackermann [2023-12-02 15:09:20,005 INFO L943 BoogieBacktranslator]: Reduced CFG by removing 13 nodes and edges [2023-12-02 15:09:20,005 INFO L943 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2023-12-02 15:09:20,006 INFO L943 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2023-12-02 15:09:20,006 INFO L943 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2023-12-02 15:09:20,077 INFO L149 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/witness.graphml [2023-12-02 15:09:20,077 INFO L149 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/witness.yml [2023-12-02 15:09:20,077 INFO L131 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2023-12-02 15:09:20,078 INFO L158 Benchmark]: Toolchain (without parser) took 37918.48ms. Allocated memory was 159.4MB in the beginning and 406.8MB in the end (delta: 247.5MB). Free memory was 114.2MB in the beginning and 356.5MB in the end (delta: -242.4MB). Peak memory consumption was 7.0MB. Max. memory is 16.1GB. [2023-12-02 15:09:20,078 INFO L158 Benchmark]: CDTParser took 0.20ms. Allocated memory is still 113.2MB. Free memory is still 63.0MB. There was no memory consumed. Max. memory is 16.1GB. [2023-12-02 15:09:20,079 INFO L158 Benchmark]: CACSL2BoogieTranslator took 210.15ms. Allocated memory is still 159.4MB. Free memory was 114.2MB in the beginning and 103.7MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2023-12-02 15:09:20,079 INFO L158 Benchmark]: Boogie Procedure Inliner took 27.12ms. Allocated memory is still 159.4MB. Free memory was 103.7MB in the beginning and 102.5MB in the end (delta: 1.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-12-02 15:09:20,080 INFO L158 Benchmark]: Boogie Preprocessor took 18.78ms. Allocated memory is still 159.4MB. Free memory was 102.5MB in the beginning and 101.5MB in the end (delta: 946.8kB). There was no memory consumed. Max. memory is 16.1GB. [2023-12-02 15:09:20,080 INFO L158 Benchmark]: RCFGBuilder took 276.04ms. Allocated memory is still 159.4MB. Free memory was 101.4MB in the beginning and 90.4MB in the end (delta: 11.0MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2023-12-02 15:09:20,081 INFO L158 Benchmark]: TraceAbstraction took 37296.24ms. Allocated memory was 159.4MB in the beginning and 406.8MB in the end (delta: 247.5MB). Free memory was 89.5MB in the beginning and 360.7MB in the end (delta: -271.2MB). Peak memory consumption was 212.5MB. Max. memory is 16.1GB. [2023-12-02 15:09:20,081 INFO L158 Benchmark]: Witness Printer took 82.29ms. Allocated memory is still 406.8MB. Free memory was 360.7MB in the beginning and 356.5MB in the end (delta: 4.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-12-02 15:09:20,083 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20ms. Allocated memory is still 113.2MB. Free memory is still 63.0MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 210.15ms. Allocated memory is still 159.4MB. Free memory was 114.2MB in the beginning and 103.7MB in the end (delta: 10.5MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 27.12ms. Allocated memory is still 159.4MB. Free memory was 103.7MB in the beginning and 102.5MB in the end (delta: 1.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 18.78ms. Allocated memory is still 159.4MB. Free memory was 102.5MB in the beginning and 101.5MB in the end (delta: 946.8kB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 276.04ms. Allocated memory is still 159.4MB. Free memory was 101.4MB in the beginning and 90.4MB in the end (delta: 11.0MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * TraceAbstraction took 37296.24ms. Allocated memory was 159.4MB in the beginning and 406.8MB in the end (delta: 247.5MB). Free memory was 89.5MB in the beginning and 360.7MB in the end (delta: -271.2MB). Peak memory consumption was 212.5MB. Max. memory is 16.1GB. * Witness Printer took 82.29ms. Allocated memory is still 406.8MB. Free memory was 360.7MB in the beginning and 356.5MB in the end (delta: 4.2MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 45]: a call to reach_error is unreachable For all program executions holds that a call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 21 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 37.2s, OverallIterations: 8, TraceHistogramMax: 27, PathProgramHistogramMax: 6, EmptinessCheckTime: 0.0s, AutomataDifference: 6.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 4.4s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 457 SdHoareTripleChecker+Valid, 2.3s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 440 mSDsluCounter, 1178 SdHoareTripleChecker+Invalid, 2.0s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 996 mSDsCounter, 549 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 4022 IncrementalHoareTripleChecker+Invalid, 4571 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 549 mSolverCounterUnsat, 182 mSDtfsCounter, 4022 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 1982 GetRequests, 1524 SyntacticMatches, 70 SemanticMatches, 388 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7672 ImplicationChecksByTransitivity, 5.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=158occurred in iteration=7, InterpolantAutomatonStates: 264, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 8 MinimizatonAttempts, 134 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 5 LocationsWithAnnotation, 553 PreInvPairs, 1355 NumberOfFragments, 158 HoareAnnotationTreeSize, 553 FomulaSimplifications, 110922 FormulaSimplificationTreeSizeReduction, 3.0s HoareSimplificationTime, 5 FomulaSimplificationsInter, 7350 FormulaSimplificationTreeSizeReductionInter, 1.4s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 23.4s InterpolantComputationTime, 1619 NumberOfCodeBlocks, 1581 NumberOfCodeBlocksAsserted, 42 NumberOfCheckSat, 2401 ConstructedInterpolants, 0 QuantifiedInterpolants, 4793 SizeOfPredicates, 49 NumberOfNonLiveVariables, 2382 ConjunctsInSsa, 166 ConjunctsInUnsatCore, 22 InterpolantComputations, 1 PerfectInterpolantSequences, 14400/17613 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2023-12-02 15:09:20,100 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_785b0865-6b0b-4daf-b906-074ac961432e/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE