./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive/MultCommutative-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4fc63b2a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive/MultCommutative-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2 --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 ce29b37e076ab683230ebf17073db3b7759ea39570dd2ef64322b6d43bb636cd --- Real Ultimate output --- This is Ultimate 0.2.5-dev-4fc63b2 [2024-11-02 11:26:50,039 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-02 11:26:50,142 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-02 11:26:50,149 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-02 11:26:50,152 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-02 11:26:50,186 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-02 11:26:50,187 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-02 11:26:50,187 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-02 11:26:50,188 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-02 11:26:50,190 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-02 11:26:50,191 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-02 11:26:50,191 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-02 11:26:50,192 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-02 11:26:50,195 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-02 11:26:50,196 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-02 11:26:50,196 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-02 11:26:50,196 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-02 11:26:50,197 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-02 11:26:50,197 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-02 11:26:50,197 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-02 11:26:50,197 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-02 11:26:50,200 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-02 11:26:50,201 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-02 11:26:50,201 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-02 11:26:50,201 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-02 11:26:50,201 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-02 11:26:50,202 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-02 11:26:50,202 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-02 11:26:50,202 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-02 11:26:50,202 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-02 11:26:50,203 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-02 11:26:50,203 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-02 11:26:50,203 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-02 11:26:50,204 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-02 11:26:50,205 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-02 11:26:50,206 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-02 11:26:50,206 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-02 11:26:50,206 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-02 11:26:50,206 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-02 11:26:50,207 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-02 11:26:50,207 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-02 11:26:50,207 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-02 11:26:50,208 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-02 11:26:50,208 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-02 11:26:50,208 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-02 11:26:50,209 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-02 11:26:50,209 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-02 11:26:50,209 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_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ce29b37e076ab683230ebf17073db3b7759ea39570dd2ef64322b6d43bb636cd [2024-11-02 11:26:50,487 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-02 11:26:50,520 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-02 11:26:50,524 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-02 11:26:50,526 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-02 11:26:50,527 INFO L274 PluginConnector]: CDTParser initialized [2024-11-02 11:26:50,528 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/../../sv-benchmarks/c/recursive/MultCommutative-2.c Unable to find full path for "g++" [2024-11-02 11:26:52,551 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-02 11:26:52,777 INFO L384 CDTParser]: Found 1 translation units. [2024-11-02 11:26:52,777 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/sv-benchmarks/c/recursive/MultCommutative-2.c [2024-11-02 11:26:52,783 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/data/a63267c29/d6eb4786ad0e47d486d4b94e5b67d2cb/FLAGd66f6d717 [2024-11-02 11:26:52,800 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/data/a63267c29/d6eb4786ad0e47d486d4b94e5b67d2cb [2024-11-02 11:26:52,802 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-02 11:26:52,804 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-02 11:26:52,805 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-02 11:26:52,806 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-02 11:26:52,812 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-02 11:26:52,813 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 11:26:52" (1/1) ... [2024-11-02 11:26:52,814 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@20f188ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:52, skipping insertion in model container [2024-11-02 11:26:52,814 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 11:26:52" (1/1) ... [2024-11-02 11:26:52,834 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-02 11:26:53,023 WARN L251 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_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/sv-benchmarks/c/recursive/MultCommutative-2.c[970,983] [2024-11-02 11:26:53,028 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-02 11:26:53,039 INFO L200 MainTranslator]: Completed pre-run [2024-11-02 11:26:53,054 WARN L251 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_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/sv-benchmarks/c/recursive/MultCommutative-2.c[970,983] [2024-11-02 11:26:53,055 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-02 11:26:53,074 INFO L204 MainTranslator]: Completed translation [2024-11-02 11:26:53,074 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:53 WrapperNode [2024-11-02 11:26:53,074 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-02 11:26:53,075 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-02 11:26:53,076 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-02 11:26:53,076 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-02 11:26:53,083 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:53" (1/1) ... [2024-11-02 11:26:53,088 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:53" (1/1) ... [2024-11-02 11:26:53,102 INFO L138 Inliner]: procedures = 13, calls = 11, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 37 [2024-11-02 11:26:53,102 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-02 11:26:53,103 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-02 11:26:53,103 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-02 11:26:53,104 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-02 11:26:53,113 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:53" (1/1) ... [2024-11-02 11:26:53,113 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:53" (1/1) ... [2024-11-02 11:26:53,114 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:53" (1/1) ... [2024-11-02 11:26:53,115 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:53" (1/1) ... [2024-11-02 11:26:53,117 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:53" (1/1) ... [2024-11-02 11:26:53,119 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:53" (1/1) ... [2024-11-02 11:26:53,120 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:53" (1/1) ... [2024-11-02 11:26:53,121 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:53" (1/1) ... [2024-11-02 11:26:53,123 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-02 11:26:53,124 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-02 11:26:53,124 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-02 11:26:53,124 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-02 11:26:53,125 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:53" (1/1) ... [2024-11-02 11:26:53,135 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-02 11:26:53,149 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:26:53,165 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-02 11:26:53,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-02 11:26:53,204 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-02 11:26:53,205 INFO L130 BoogieDeclarations]: Found specification of procedure mult [2024-11-02 11:26:53,205 INFO L138 BoogieDeclarations]: Found implementation of procedure mult [2024-11-02 11:26:53,207 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-02 11:26:53,207 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-02 11:26:53,207 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-02 11:26:53,274 INFO L238 CfgBuilder]: Building ICFG [2024-11-02 11:26:53,276 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-02 11:26:53,433 INFO L? ?]: Removed 14 outVars from TransFormulas that were not future-live. [2024-11-02 11:26:53,433 INFO L287 CfgBuilder]: Performing block encoding [2024-11-02 11:26:53,461 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-02 11:26:53,461 INFO L316 CfgBuilder]: Removed 0 assume(true) statements. [2024-11-02 11:26:53,461 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 11:26:53 BoogieIcfgContainer [2024-11-02 11:26:53,461 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-02 11:26:53,463 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-02 11:26:53,463 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-02 11:26:53,466 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-02 11:26:53,466 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 11:26:52" (1/3) ... [2024-11-02 11:26:53,467 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5039ff0a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 11:26:53, skipping insertion in model container [2024-11-02 11:26:53,467 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:26:53" (2/3) ... [2024-11-02 11:26:53,467 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5039ff0a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 11:26:53, skipping insertion in model container [2024-11-02 11:26:53,467 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 11:26:53" (3/3) ... [2024-11-02 11:26:53,469 INFO L112 eAbstractionObserver]: Analyzing ICFG MultCommutative-2.c [2024-11-02 11:26:53,483 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-02 11:26:53,483 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-11-02 11:26:53,545 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-02 11:26:53,551 INFO L333 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, 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;@26c036fe, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-02 11:26:53,551 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-02 11:26:53,554 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) [2024-11-02 11:26:53,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2024-11-02 11:26:53,561 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:26:53,562 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:26:53,562 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:26:53,566 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:26:53,567 INFO L85 PathProgramCache]: Analyzing trace with hash 647179642, now seen corresponding path program 1 times [2024-11-02 11:26:53,577 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:26:53,577 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1425857849] [2024-11-02 11:26:53,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:53,578 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:26:53,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:53,952 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2024-11-02 11:26:53,952 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:26:53,953 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1425857849] [2024-11-02 11:26:53,953 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1425857849] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 11:26:53,954 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 11:26:53,954 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2024-11-02 11:26:53,958 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436014009] [2024-11-02 11:26:53,959 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 11:26:53,963 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-11-02 11:26:53,963 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:26:53,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-11-02 11:26:53,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2024-11-02 11:26:53,987 INFO L87 Difference]: Start difference. First operand has 21 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 15 states have internal predecessors, (20), 4 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-11-02 11:26:54,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:26:54,095 INFO L93 Difference]: Finished difference Result 33 states and 46 transitions. [2024-11-02 11:26:54,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-11-02 11:26:54,098 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2024-11-02 11:26:54,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:26:54,106 INFO L225 Difference]: With dead ends: 33 [2024-11-02 11:26:54,107 INFO L226 Difference]: Without dead ends: 25 [2024-11-02 11:26:54,110 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2024-11-02 11:26:54,113 INFO L432 NwaCegarLoop]: 21 mSDtfsCounter, 2 mSDsluCounter, 101 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 122 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-02 11:26:54,115 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 122 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-02 11:26:54,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2024-11-02 11:26:54,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2024-11-02 11:26:54,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 5 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (9), 5 states have call predecessors, (9), 5 states have call successors, (9) [2024-11-02 11:26:54,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2024-11-02 11:26:54,157 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 19 [2024-11-02 11:26:54,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:26:54,158 INFO L471 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2024-11-02 11:26:54,158 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2024-11-02 11:26:54,159 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2024-11-02 11:26:54,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2024-11-02 11:26:54,161 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:26:54,161 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:26:54,162 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-02 11:26:54,162 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:26:54,163 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:26:54,163 INFO L85 PathProgramCache]: Analyzing trace with hash 1580415186, now seen corresponding path program 1 times [2024-11-02 11:26:54,163 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:26:54,163 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1187976844] [2024-11-02 11:26:54,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:54,164 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:26:54,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:54,461 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2024-11-02 11:26:54,462 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:26:54,462 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1187976844] [2024-11-02 11:26:54,463 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1187976844] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 11:26:54,463 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 11:26:54,463 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2024-11-02 11:26:54,463 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962981056] [2024-11-02 11:26:54,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 11:26:54,466 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-11-02 11:26:54,466 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:26:54,467 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-11-02 11:26:54,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2024-11-02 11:26:54,467 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2024-11-02 11:26:54,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:26:54,547 INFO L93 Difference]: Finished difference Result 34 states and 48 transitions. [2024-11-02 11:26:54,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-11-02 11:26:54,548 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 25 [2024-11-02 11:26:54,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:26:54,550 INFO L225 Difference]: With dead ends: 34 [2024-11-02 11:26:54,550 INFO L226 Difference]: Without dead ends: 30 [2024-11-02 11:26:54,551 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2024-11-02 11:26:54,552 INFO L432 NwaCegarLoop]: 20 mSDtfsCounter, 1 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 40 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-02 11:26:54,553 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 131 Invalid, 40 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-02 11:26:54,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2024-11-02 11:26:54,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 24. [2024-11-02 11:26:54,562 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) [2024-11-02 11:26:54,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 32 transitions. [2024-11-02 11:26:54,564 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 32 transitions. Word has length 25 [2024-11-02 11:26:54,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:26:54,564 INFO L471 AbstractCegarLoop]: Abstraction has 24 states and 32 transitions. [2024-11-02 11:26:54,565 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2024-11-02 11:26:54,565 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 32 transitions. [2024-11-02 11:26:54,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2024-11-02 11:26:54,566 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:26:54,567 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:26:54,567 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-11-02 11:26:54,567 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:26:54,568 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:26:54,568 INFO L85 PathProgramCache]: Analyzing trace with hash -124187766, now seen corresponding path program 1 times [2024-11-02 11:26:54,569 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:26:54,569 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [282561554] [2024-11-02 11:26:54,570 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:54,570 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:26:54,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:54,701 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2024-11-02 11:26:54,701 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:26:54,701 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [282561554] [2024-11-02 11:26:54,702 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [282561554] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:26:54,702 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [28423084] [2024-11-02 11:26:54,702 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:54,702 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:54,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:26:54,707 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:26:54,712 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-02 11:26:54,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:54,802 INFO L255 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-02 11:26:54,807 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:26:54,864 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2024-11-02 11:26:54,864 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:26:54,976 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2024-11-02 11:26:54,977 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [28423084] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:26:54,977 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1532273650] [2024-11-02 11:26:54,999 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2024-11-02 11:26:54,999 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:26:55,004 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:426) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:312) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:273) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:167) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-02 11:26:55,006 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:26:55,006 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 6 [2024-11-02 11:26:55,006 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614947607] [2024-11-02 11:26:55,007 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:26:55,007 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2024-11-02 11:26:55,007 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:26:55,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2024-11-02 11:26:55,008 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-02 11:26:55,009 INFO L87 Difference]: Start difference. First operand 24 states and 32 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2024-11-02 11:26:55,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:26:55,138 INFO L93 Difference]: Finished difference Result 34 states and 52 transitions. [2024-11-02 11:26:55,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-11-02 11:26:55,140 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 26 [2024-11-02 11:26:55,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:26:55,141 INFO L225 Difference]: With dead ends: 34 [2024-11-02 11:26:55,141 INFO L226 Difference]: Without dead ends: 26 [2024-11-02 11:26:55,142 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 51 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2024-11-02 11:26:55,143 INFO L432 NwaCegarLoop]: 16 mSDtfsCounter, 6 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 11:26:55,146 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 48 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 11:26:55,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2024-11-02 11:26:55,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 21. [2024-11-02 11:26:55,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (7), 4 states have call predecessors, (7), 4 states have call successors, (7) [2024-11-02 11:26:55,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 27 transitions. [2024-11-02 11:26:55,156 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 27 transitions. Word has length 26 [2024-11-02 11:26:55,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:26:55,157 INFO L471 AbstractCegarLoop]: Abstraction has 21 states and 27 transitions. [2024-11-02 11:26:55,157 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2024-11-02 11:26:55,157 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 27 transitions. [2024-11-02 11:26:55,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2024-11-02 11:26:55,158 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:26:55,158 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:26:55,180 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-11-02 11:26:55,359 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:55,359 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:26:55,360 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:26:55,361 INFO L85 PathProgramCache]: Analyzing trace with hash -590605896, now seen corresponding path program 2 times [2024-11-02 11:26:55,361 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:26:55,361 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077856011] [2024-11-02 11:26:55,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:55,362 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:26:55,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:55,462 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2024-11-02 11:26:55,462 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:26:55,463 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1077856011] [2024-11-02 11:26:55,463 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1077856011] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 11:26:55,463 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 11:26:55,463 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2024-11-02 11:26:55,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917509337] [2024-11-02 11:26:55,464 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 11:26:55,464 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-02 11:26:55,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:26:55,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-02 11:26:55,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2024-11-02 11:26:55,466 INFO L87 Difference]: Start difference. First operand 21 states and 27 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2024-11-02 11:26:55,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:26:55,551 INFO L93 Difference]: Finished difference Result 27 states and 34 transitions. [2024-11-02 11:26:55,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-11-02 11:26:55,552 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 26 [2024-11-02 11:26:55,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:26:55,554 INFO L225 Difference]: With dead ends: 27 [2024-11-02 11:26:55,556 INFO L226 Difference]: Without dead ends: 23 [2024-11-02 11:26:55,557 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2024-11-02 11:26:55,558 INFO L432 NwaCegarLoop]: 16 mSDtfsCounter, 6 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 11:26:55,558 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 43 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 11:26:55,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2024-11-02 11:26:55,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2024-11-02 11:26:55,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (6), 4 states have call predecessors, (6), 4 states have call successors, (6) [2024-11-02 11:26:55,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2024-11-02 11:26:55,570 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 26 [2024-11-02 11:26:55,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:26:55,570 INFO L471 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2024-11-02 11:26:55,571 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2024-11-02 11:26:55,571 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2024-11-02 11:26:55,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2024-11-02 11:26:55,572 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:26:55,572 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:26:55,572 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2024-11-02 11:26:55,573 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:26:55,573 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:26:55,573 INFO L85 PathProgramCache]: Analyzing trace with hash 132154764, now seen corresponding path program 3 times [2024-11-02 11:26:55,574 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:26:55,574 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1306995536] [2024-11-02 11:26:55,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:55,574 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:26:55,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:56,491 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 22 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-02 11:26:56,494 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:26:56,494 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1306995536] [2024-11-02 11:26:56,494 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1306995536] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:26:56,495 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1598875065] [2024-11-02 11:26:56,495 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-02 11:26:56,495 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:56,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:26:56,499 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:26:56,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-02 11:26:56,570 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-02 11:26:56,570 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-02 11:26:56,572 INFO L255 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 41 conjuncts are in the unsatisfiable core [2024-11-02 11:26:56,576 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:26:57,014 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 14 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2024-11-02 11:26:57,014 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:26:58,475 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 14 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2024-11-02 11:26:58,477 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1598875065] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:26:58,477 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1774099595] [2024-11-02 11:26:58,481 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2024-11-02 11:26:58,482 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:26:58,483 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:426) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:312) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:273) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:167) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-02 11:26:58,487 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:26:58,487 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 11, 14] total 35 [2024-11-02 11:26:58,487 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346188410] [2024-11-02 11:26:58,487 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:26:58,488 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2024-11-02 11:26:58,488 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:26:58,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2024-11-02 11:26:58,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1061, Unknown=0, NotChecked=0, Total=1190 [2024-11-02 11:26:58,490 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 35 states, 32 states have (on average 1.53125) internal successors, (49), 24 states have internal predecessors, (49), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) [2024-11-02 11:26:59,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:26:59,361 INFO L93 Difference]: Finished difference Result 37 states and 48 transitions. [2024-11-02 11:26:59,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2024-11-02 11:26:59,361 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 32 states have (on average 1.53125) internal successors, (49), 24 states have internal predecessors, (49), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) Word has length 33 [2024-11-02 11:26:59,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:26:59,364 INFO L225 Difference]: With dead ends: 37 [2024-11-02 11:26:59,365 INFO L226 Difference]: Without dead ends: 33 [2024-11-02 11:26:59,367 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 388 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=274, Invalid=1796, Unknown=0, NotChecked=0, Total=2070 [2024-11-02 11:26:59,368 INFO L432 NwaCegarLoop]: 13 mSDtfsCounter, 56 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 410 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-02 11:26:59,368 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 121 Invalid, 410 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-02 11:26:59,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2024-11-02 11:26:59,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 28. [2024-11-02 11:26:59,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 20 states have internal predecessors, (20), 5 states have call successors, (5), 1 states have call predecessors, (5), 4 states have return successors, (13), 6 states have call predecessors, (13), 5 states have call successors, (13) [2024-11-02 11:26:59,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions. [2024-11-02 11:26:59,384 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 33 [2024-11-02 11:26:59,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:26:59,385 INFO L471 AbstractCegarLoop]: Abstraction has 28 states and 38 transitions. [2024-11-02 11:26:59,385 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 32 states have (on average 1.53125) internal successors, (49), 24 states have internal predecessors, (49), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (11), 11 states have call predecessors, (11), 9 states have call successors, (11) [2024-11-02 11:26:59,385 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions. [2024-11-02 11:26:59,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2024-11-02 11:26:59,387 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:26:59,387 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:26:59,413 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-11-02 11:26:59,591 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:59,592 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:26:59,593 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:26:59,593 INFO L85 PathProgramCache]: Analyzing trace with hash 169705396, now seen corresponding path program 1 times [2024-11-02 11:26:59,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:26:59,593 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1664673931] [2024-11-02 11:26:59,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:59,594 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:26:59,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:59,694 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 21 proven. 2 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-02 11:26:59,694 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:26:59,694 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1664673931] [2024-11-02 11:26:59,694 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1664673931] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:26:59,695 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [571748561] [2024-11-02 11:26:59,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:26:59,695 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:26:59,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:26:59,698 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:26:59,699 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-02 11:26:59,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:26:59,788 INFO L255 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 6 conjuncts are in the unsatisfiable core [2024-11-02 11:26:59,790 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:26:59,841 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2024-11-02 11:26:59,841 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:27:00,060 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2024-11-02 11:27:00,060 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [571748561] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:27:00,060 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [344185198] [2024-11-02 11:27:00,065 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2024-11-02 11:27:00,065 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:27:00,066 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:426) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:312) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:273) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:167) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-02 11:27:00,066 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:27:00,066 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 10 [2024-11-02 11:27:00,067 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [663842167] [2024-11-02 11:27:00,067 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:27:00,068 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2024-11-02 11:27:00,069 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:27:00,069 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2024-11-02 11:27:00,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2024-11-02 11:27:00,070 INFO L87 Difference]: Start difference. First operand 28 states and 38 transitions. Second operand has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2024-11-02 11:27:00,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:27:00,245 INFO L93 Difference]: Finished difference Result 56 states and 82 transitions. [2024-11-02 11:27:00,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2024-11-02 11:27:00,247 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 39 [2024-11-02 11:27:00,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:27:00,248 INFO L225 Difference]: With dead ends: 56 [2024-11-02 11:27:00,248 INFO L226 Difference]: Without dead ends: 24 [2024-11-02 11:27:00,249 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 75 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=71, Invalid=139, Unknown=0, NotChecked=0, Total=210 [2024-11-02 11:27:00,252 INFO L432 NwaCegarLoop]: 18 mSDtfsCounter, 14 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 11:27:00,253 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 76 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 11:27:00,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2024-11-02 11:27:00,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2024-11-02 11:27:00,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 16 states have (on average 1.0625) internal successors, (17), 17 states have internal predecessors, (17), 4 states have call successors, (4), 1 states have call predecessors, (4), 3 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2024-11-02 11:27:00,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2024-11-02 11:27:00,261 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 39 [2024-11-02 11:27:00,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:27:00,262 INFO L471 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2024-11-02 11:27:00,262 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 10 states have internal predecessors, (32), 5 states have call successors, (7), 1 states have call predecessors, (7), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2024-11-02 11:27:00,262 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2024-11-02 11:27:00,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2024-11-02 11:27:00,263 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:27:00,264 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 5, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:27:00,290 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2024-11-02 11:27:00,466 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:27:00,467 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:27:00,467 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:27:00,467 INFO L85 PathProgramCache]: Analyzing trace with hash 735115528, now seen corresponding path program 4 times [2024-11-02 11:27:00,467 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:27:00,467 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840846551] [2024-11-02 11:27:00,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:27:00,468 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:27:00,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:27:01,179 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 4 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2024-11-02 11:27:01,179 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:27:01,180 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1840846551] [2024-11-02 11:27:01,180 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1840846551] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:27:01,180 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726056904] [2024-11-02 11:27:01,180 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-02 11:27:01,180 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:27:01,180 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:27:01,183 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:27:01,185 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-02 11:27:01,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:27:01,250 INFO L255 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 57 conjuncts are in the unsatisfiable core [2024-11-02 11:27:01,252 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:27:01,879 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 17 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2024-11-02 11:27:01,879 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:27:03,596 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 8 proven. 38 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2024-11-02 11:27:03,597 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [726056904] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:27:03,597 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [298895625] [2024-11-02 11:27:03,599 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2024-11-02 11:27:03,599 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:27:03,600 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:426) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:312) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:273) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:167) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-02 11:27:03,601 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:27:03,601 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19, 20] total 49 [2024-11-02 11:27:03,601 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344433270] [2024-11-02 11:27:03,601 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:27:03,602 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2024-11-02 11:27:03,602 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:27:03,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2024-11-02 11:27:03,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=2171, Unknown=0, NotChecked=0, Total=2352 [2024-11-02 11:27:03,605 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 49 states, 46 states have (on average 1.5434782608695652) internal successors, (71), 34 states have internal predecessors, (71), 12 states have call successors, (12), 1 states have call predecessors, (12), 11 states have return successors, (15), 15 states have call predecessors, (15), 12 states have call successors, (15) [2024-11-02 11:27:05,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:27:05,090 INFO L93 Difference]: Finished difference Result 53 states and 68 transitions. [2024-11-02 11:27:05,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2024-11-02 11:27:05,092 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 46 states have (on average 1.5434782608695652) internal successors, (71), 34 states have internal predecessors, (71), 12 states have call successors, (12), 1 states have call predecessors, (12), 11 states have return successors, (15), 15 states have call predecessors, (15), 12 states have call successors, (15) Word has length 40 [2024-11-02 11:27:05,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:27:05,094 INFO L225 Difference]: With dead ends: 53 [2024-11-02 11:27:05,094 INFO L226 Difference]: Without dead ends: 47 [2024-11-02 11:27:05,096 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 926 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=462, Invalid=3960, Unknown=0, NotChecked=0, Total=4422 [2024-11-02 11:27:05,097 INFO L432 NwaCegarLoop]: 13 mSDtfsCounter, 41 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 719 mSolverCounterSat, 63 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 197 SdHoareTripleChecker+Invalid, 782 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 63 IncrementalHoareTripleChecker+Valid, 719 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2024-11-02 11:27:05,098 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 197 Invalid, 782 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [63 Valid, 719 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2024-11-02 11:27:05,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2024-11-02 11:27:05,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 39. [2024-11-02 11:27:05,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 39 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 27 states have internal predecessors, (28), 6 states have call successors, (6), 2 states have call predecessors, (6), 6 states have return successors, (19), 9 states have call predecessors, (19), 6 states have call successors, (19) [2024-11-02 11:27:05,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 53 transitions. [2024-11-02 11:27:05,109 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 53 transitions. Word has length 40 [2024-11-02 11:27:05,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:27:05,110 INFO L471 AbstractCegarLoop]: Abstraction has 39 states and 53 transitions. [2024-11-02 11:27:05,110 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 46 states have (on average 1.5434782608695652) internal successors, (71), 34 states have internal predecessors, (71), 12 states have call successors, (12), 1 states have call predecessors, (12), 11 states have return successors, (15), 15 states have call predecessors, (15), 12 states have call successors, (15) [2024-11-02 11:27:05,110 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 53 transitions. [2024-11-02 11:27:05,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2024-11-02 11:27:05,112 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:27:05,112 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 5, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:27:05,134 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2024-11-02 11:27:05,314 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2024-11-02 11:27:05,315 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:27:05,316 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:27:05,316 INFO L85 PathProgramCache]: Analyzing trace with hash 2110838554, now seen corresponding path program 5 times [2024-11-02 11:27:05,316 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:27:05,317 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1153971897] [2024-11-02 11:27:05,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:27:05,317 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:27:05,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:27:05,976 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 2 proven. 40 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2024-11-02 11:27:05,977 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:27:05,977 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1153971897] [2024-11-02 11:27:05,977 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1153971897] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:27:05,977 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [3711758] [2024-11-02 11:27:05,978 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-02 11:27:05,978 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:27:05,978 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:27:05,979 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:27:05,981 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-02 11:27:06,067 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2024-11-02 11:27:06,067 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-02 11:27:06,069 INFO L255 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 61 conjuncts are in the unsatisfiable core [2024-11-02 11:27:06,076 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:27:06,823 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 3 proven. 28 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-02 11:27:06,824 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:27:07,795 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2024-11-02 11:27:07,795 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [3711758] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:27:07,796 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [986074509] [2024-11-02 11:27:07,798 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2024-11-02 11:27:07,798 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:27:07,799 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:426) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:312) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:273) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:167) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-02 11:27:07,799 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:27:07,799 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 14, 15] total 42 [2024-11-02 11:27:07,799 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617888050] [2024-11-02 11:27:07,800 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:27:07,800 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2024-11-02 11:27:07,800 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:27:07,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2024-11-02 11:27:07,802 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1587, Unknown=0, NotChecked=0, Total=1722 [2024-11-02 11:27:07,802 INFO L87 Difference]: Start difference. First operand 39 states and 53 transitions. Second operand has 42 states, 38 states have (on average 1.5526315789473684) internal successors, (59), 29 states have internal predecessors, (59), 10 states have call successors, (10), 1 states have call predecessors, (10), 8 states have return successors, (13), 13 states have call predecessors, (13), 10 states have call successors, (13) [2024-11-02 11:27:09,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:27:09,361 INFO L93 Difference]: Finished difference Result 56 states and 74 transitions. [2024-11-02 11:27:09,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2024-11-02 11:27:09,364 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 38 states have (on average 1.5526315789473684) internal successors, (59), 29 states have internal predecessors, (59), 10 states have call successors, (10), 1 states have call predecessors, (10), 8 states have return successors, (13), 13 states have call predecessors, (13), 10 states have call successors, (13) Word has length 40 [2024-11-02 11:27:09,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:27:09,365 INFO L225 Difference]: With dead ends: 56 [2024-11-02 11:27:09,366 INFO L226 Difference]: Without dead ends: 48 [2024-11-02 11:27:09,371 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 728 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=435, Invalid=3347, Unknown=0, NotChecked=0, Total=3782 [2024-11-02 11:27:09,372 INFO L432 NwaCegarLoop]: 13 mSDtfsCounter, 19 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 761 mSolverCounterSat, 42 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 803 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 42 IncrementalHoareTripleChecker+Valid, 761 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-02 11:27:09,373 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 187 Invalid, 803 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [42 Valid, 761 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-02 11:27:09,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2024-11-02 11:27:09,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 43. [2024-11-02 11:27:09,397 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 29 states have (on average 1.103448275862069) internal successors, (32), 30 states have internal predecessors, (32), 7 states have call successors, (7), 3 states have call predecessors, (7), 6 states have return successors, (19), 9 states have call predecessors, (19), 7 states have call successors, (19) [2024-11-02 11:27:09,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 58 transitions. [2024-11-02 11:27:09,400 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 58 transitions. Word has length 40 [2024-11-02 11:27:09,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:27:09,404 INFO L471 AbstractCegarLoop]: Abstraction has 43 states and 58 transitions. [2024-11-02 11:27:09,405 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 38 states have (on average 1.5526315789473684) internal successors, (59), 29 states have internal predecessors, (59), 10 states have call successors, (10), 1 states have call predecessors, (10), 8 states have return successors, (13), 13 states have call predecessors, (13), 10 states have call successors, (13) [2024-11-02 11:27:09,405 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 58 transitions. [2024-11-02 11:27:09,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2024-11-02 11:27:09,407 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:27:09,407 INFO L215 NwaCegarLoop]: trace histogram [7, 7, 7, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:27:09,437 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2024-11-02 11:27:09,608 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:27:09,608 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:27:09,609 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:27:09,609 INFO L85 PathProgramCache]: Analyzing trace with hash -1021797736, now seen corresponding path program 6 times [2024-11-02 11:27:09,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:27:09,610 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1517503335] [2024-11-02 11:27:09,610 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:27:09,610 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:27:09,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:27:10,681 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-02 11:27:10,681 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:27:10,682 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1517503335] [2024-11-02 11:27:10,682 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1517503335] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:27:10,682 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [246300707] [2024-11-02 11:27:10,682 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-02 11:27:10,682 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:27:10,683 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:27:10,685 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:27:10,686 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-02 11:27:10,762 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-02 11:27:10,762 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-02 11:27:10,765 INFO L255 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 85 conjuncts are in the unsatisfiable core [2024-11-02 11:27:10,767 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:27:11,585 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 2 proven. 62 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2024-11-02 11:27:11,585 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:27:13,622 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 20 proven. 80 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-02 11:27:13,623 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [246300707] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:27:13,624 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1081787378] [2024-11-02 11:27:13,626 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2024-11-02 11:27:13,630 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:27:13,631 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:426) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:312) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:273) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:167) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-02 11:27:13,631 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:27:13,632 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 16, 24] total 58 [2024-11-02 11:27:13,632 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514614006] [2024-11-02 11:27:13,632 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:27:13,633 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2024-11-02 11:27:13,633 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:27:13,634 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2024-11-02 11:27:13,635 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=201, Invalid=3105, Unknown=0, NotChecked=0, Total=3306 [2024-11-02 11:27:13,639 INFO L87 Difference]: Start difference. First operand 43 states and 58 transitions. Second operand has 58 states, 53 states have (on average 1.490566037735849) internal successors, (79), 40 states have internal predecessors, (79), 15 states have call successors, (15), 1 states have call predecessors, (15), 13 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19) [2024-11-02 11:27:15,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:27:15,868 INFO L93 Difference]: Finished difference Result 68 states and 95 transitions. [2024-11-02 11:27:15,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2024-11-02 11:27:15,872 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 53 states have (on average 1.490566037735849) internal successors, (79), 40 states have internal predecessors, (79), 15 states have call successors, (15), 1 states have call predecessors, (15), 13 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19) Word has length 54 [2024-11-02 11:27:15,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:27:15,881 INFO L225 Difference]: With dead ends: 68 [2024-11-02 11:27:15,881 INFO L226 Difference]: Without dead ends: 57 [2024-11-02 11:27:15,883 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 81 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1342 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=682, Invalid=6124, Unknown=0, NotChecked=0, Total=6806 [2024-11-02 11:27:15,892 INFO L432 NwaCegarLoop]: 14 mSDtfsCounter, 42 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 1266 mSolverCounterSat, 68 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 1334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 68 IncrementalHoareTripleChecker+Valid, 1266 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2024-11-02 11:27:15,893 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 289 Invalid, 1334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [68 Valid, 1266 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2024-11-02 11:27:15,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2024-11-02 11:27:15,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 52. [2024-11-02 11:27:15,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 36 states have internal predecessors, (39), 9 states have call successors, (9), 4 states have call predecessors, (9), 7 states have return successors, (26), 11 states have call predecessors, (26), 9 states have call successors, (26) [2024-11-02 11:27:15,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 74 transitions. [2024-11-02 11:27:15,931 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 74 transitions. Word has length 54 [2024-11-02 11:27:15,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:27:15,932 INFO L471 AbstractCegarLoop]: Abstraction has 52 states and 74 transitions. [2024-11-02 11:27:15,932 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 53 states have (on average 1.490566037735849) internal successors, (79), 40 states have internal predecessors, (79), 15 states have call successors, (15), 1 states have call predecessors, (15), 13 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19) [2024-11-02 11:27:15,932 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 74 transitions. [2024-11-02 11:27:15,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2024-11-02 11:27:15,934 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:27:15,942 INFO L215 NwaCegarLoop]: trace histogram [7, 7, 7, 5, 5, 5, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 11:27:15,974 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2024-11-02 11:27:16,143 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:27:16,144 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:27:16,145 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:27:16,145 INFO L85 PathProgramCache]: Analyzing trace with hash -1490504886, now seen corresponding path program 7 times [2024-11-02 11:27:16,145 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:27:16,145 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626859236] [2024-11-02 11:27:16,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:27:16,146 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:27:16,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:27:17,463 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-02 11:27:17,463 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:27:17,463 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626859236] [2024-11-02 11:27:17,463 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [626859236] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:27:17,464 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [764456718] [2024-11-02 11:27:17,464 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-02 11:27:17,464 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:27:17,464 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:27:17,466 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:27:17,470 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ed2d8694-8d35-4da9-b9e1-66978afdcb7c/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-02 11:27:17,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:27:17,535 INFO L255 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 85 conjuncts are in the unsatisfiable core [2024-11-02 11:27:17,538 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:27:18,546 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 3 proven. 61 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2024-11-02 11:27:18,546 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:27:20,829 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 20 proven. 80 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-02 11:27:20,830 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [764456718] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:27:20,830 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1453397948] [2024-11-02 11:27:20,832 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2024-11-02 11:27:20,833 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:27:20,833 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:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:407) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:342) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:324) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:426) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:312) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:273) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:167) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:143) 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) [2024-11-02 11:27:20,834 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:27:20,834 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 16, 24] total 57 [2024-11-02 11:27:20,835 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994522080] [2024-11-02 11:27:20,835 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:27:20,836 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2024-11-02 11:27:20,836 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:27:20,837 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2024-11-02 11:27:20,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=2997, Unknown=0, NotChecked=0, Total=3192 [2024-11-02 11:27:20,838 INFO L87 Difference]: Start difference. First operand 52 states and 74 transitions. Second operand has 57 states, 52 states have (on average 1.5) internal successors, (78), 39 states have internal predecessors, (78), 15 states have call successors, (15), 1 states have call predecessors, (15), 12 states have return successors, (19), 18 states have call predecessors, (19), 15 states have call successors, (19)