./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/recursive-simple/sum_10x0-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/sum_10x0-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ --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 68d0cd7d514b491e1404560081afc21267eb1b3dae98cdb9832a8634357d65e4 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:19:37,166 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:19:37,282 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:19:37,307 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:19:37,308 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:19:37,338 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:19:37,339 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:19:37,340 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:19:37,341 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:19:37,341 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:19:37,342 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:19:37,343 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:19:37,344 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:19:37,344 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:19:37,345 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:19:37,346 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:19:37,347 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:19:37,348 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:19:37,348 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:19:37,349 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:19:37,350 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:19:37,351 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:19:37,352 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:19:37,352 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:19:37,353 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:19:37,354 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:19:37,354 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:19:37,355 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:19:37,355 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:19:37,356 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:19:37,357 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:19:37,357 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:19:37,358 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:19:37,358 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:19:37,359 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:19:37,359 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:19:37,360 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:19:37,361 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:19:37,361 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:19:37,362 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:19:37,362 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:19:37,363 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:19:37,363 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:19:37,364 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:19:37,364 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:19:37,365 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_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 68d0cd7d514b491e1404560081afc21267eb1b3dae98cdb9832a8634357d65e4 [2023-11-19 05:19:37,796 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:19:37,834 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:19:37,837 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:19:37,838 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:19:37,839 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:19:37,841 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/recursive-simple/sum_10x0-1.c [2023-11-19 05:19:41,056 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:19:41,282 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:19:41,283 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/sv-benchmarks/c/recursive-simple/sum_10x0-1.c [2023-11-19 05:19:41,292 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/data/90713f42b/c18bf10c08cc40919ddcd90d255a4d70/FLAGc8182fa62 [2023-11-19 05:19:41,310 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/data/90713f42b/c18bf10c08cc40919ddcd90d255a4d70 [2023-11-19 05:19:41,313 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:19:41,315 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:19:41,316 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:19:41,316 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:19:41,323 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:19:41,324 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:19:41" (1/1) ... [2023-11-19 05:19:41,325 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@35fb9231 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:41, skipping insertion in model container [2023-11-19 05:19:41,326 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:19:41" (1/1) ... [2023-11-19 05:19:41,362 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:19:41,646 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/sv-benchmarks/c/recursive-simple/sum_10x0-1.c[481,494] [2023-11-19 05:19:41,652 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:19:41,663 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:19:41,680 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/sv-benchmarks/c/recursive-simple/sum_10x0-1.c[481,494] [2023-11-19 05:19:41,681 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:19:41,698 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:19:41,699 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:41 WrapperNode [2023-11-19 05:19:41,699 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:19:41,701 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:19:41,701 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:19:41,701 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:19:41,713 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:41" (1/1) ... [2023-11-19 05:19:41,722 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:41" (1/1) ... [2023-11-19 05:19:41,750 INFO L138 Inliner]: procedures = 12, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 19 [2023-11-19 05:19:41,750 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:19:41,751 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:19:41,751 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:19:41,752 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:19:41,761 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:41" (1/1) ... [2023-11-19 05:19:41,762 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:41" (1/1) ... [2023-11-19 05:19:41,763 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:41" (1/1) ... [2023-11-19 05:19:41,763 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:41" (1/1) ... [2023-11-19 05:19:41,767 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:41" (1/1) ... [2023-11-19 05:19:41,769 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:41" (1/1) ... [2023-11-19 05:19:41,776 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:41" (1/1) ... [2023-11-19 05:19:41,777 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:41" (1/1) ... [2023-11-19 05:19:41,779 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:19:41,780 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:19:41,780 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:19:41,781 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:19:41,782 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:41" (1/1) ... [2023-11-19 05:19:41,789 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:19:41,803 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:19:41,822 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:19:41,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:19:41,879 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:19:41,879 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:19:41,880 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:19:41,880 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2023-11-19 05:19:41,880 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2023-11-19 05:19:41,880 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:19:41,944 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:19:41,947 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:19:42,143 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:19:42,162 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:19:42,163 INFO L302 CfgBuilder]: Removed 0 assume(true) statements. [2023-11-19 05:19:42,168 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:19:42 BoogieIcfgContainer [2023-11-19 05:19:42,168 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:19:42,172 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:19:42,172 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:19:42,176 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:19:42,177 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:19:41" (1/3) ... [2023-11-19 05:19:42,178 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1abcd808 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:19:42, skipping insertion in model container [2023-11-19 05:19:42,178 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:19:41" (2/3) ... [2023-11-19 05:19:42,179 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1abcd808 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:19:42, skipping insertion in model container [2023-11-19 05:19:42,179 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:19:42" (3/3) ... [2023-11-19 05:19:42,181 INFO L112 eAbstractionObserver]: Analyzing ICFG sum_10x0-1.c [2023-11-19 05:19:42,205 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:19:42,206 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:19:42,261 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:19:42,269 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@11dfcefe, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:19:42,270 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:19:42,274 INFO L276 IsEmpty]: Start isEmpty. Operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 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) [2023-11-19 05:19:42,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-19 05:19:42,284 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:42,285 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:42,286 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:19:42,292 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:42,293 INFO L85 PathProgramCache]: Analyzing trace with hash 1493244868, now seen corresponding path program 1 times [2023-11-19 05:19:42,306 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:42,307 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [62524926] [2023-11-19 05:19:42,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:42,308 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:42,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:42,703 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:19:42,704 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:42,704 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [62524926] [2023-11-19 05:19:42,706 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [62524926] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:19:42,706 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:19:42,706 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 05:19:42,708 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414345044] [2023-11-19 05:19:42,709 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:19:42,713 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:19:42,714 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:42,747 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:19:42,748 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:19:42,750 INFO L87 Difference]: Start difference. First operand has 14 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 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) Second operand has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:19:42,860 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:42,860 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2023-11-19 05:19:42,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 05:19:42,863 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2023-11-19 05:19:42,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:42,874 INFO L225 Difference]: With dead ends: 22 [2023-11-19 05:19:42,875 INFO L226 Difference]: Without dead ends: 14 [2023-11-19 05:19:42,878 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:19:42,882 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 9 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:42,883 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 17 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:19:42,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-11-19 05:19:42,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2023-11-19 05:19:42,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 9 states have (on average 1.1111111111111112) internal successors, (10), 10 states have internal predecessors, (10), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-19 05:19:42,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2023-11-19 05:19:42,928 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2023-11-19 05:19:42,928 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:42,928 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2023-11-19 05:19:42,929 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:19:42,929 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2023-11-19 05:19:42,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-19 05:19:42,931 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:42,931 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:42,931 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:19:42,932 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:19:42,933 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:42,933 INFO L85 PathProgramCache]: Analyzing trace with hash -642736818, now seen corresponding path program 1 times [2023-11-19 05:19:42,933 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:42,933 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328286811] [2023-11-19 05:19:42,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:42,934 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:42,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:43,083 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:19:43,083 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:43,084 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328286811] [2023-11-19 05:19:43,084 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1328286811] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:19:43,084 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2124175338] [2023-11-19 05:19:43,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:43,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:19:43,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:19:43,088 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:19:43,112 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:19:43,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:43,165 INFO L262 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-19 05:19:43,171 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:19:43,266 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 05:19:43,267 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:19:43,488 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 05:19:43,488 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2124175338] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:19:43,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [873617236] [2023-11-19 05:19:43,530 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-19 05:19:43,531 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:19:43,536 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-19 05:19:43,541 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:19:43,542 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2023-11-19 05:19:43,543 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760513385] [2023-11-19 05:19:43,543 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:19:43,544 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-19 05:19:43,548 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:43,549 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-19 05:19:43,550 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2023-11-19 05:19:43,550 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 9 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 states have internal predecessors, (15), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-19 05:19:43,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:43,630 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2023-11-19 05:19:43,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:19:43,631 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 states have internal predecessors, (15), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) Word has length 15 [2023-11-19 05:19:43,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:43,632 INFO L225 Difference]: With dead ends: 21 [2023-11-19 05:19:43,633 INFO L226 Difference]: Without dead ends: 17 [2023-11-19 05:19:43,633 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2023-11-19 05:19:43,635 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 9 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:43,636 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 25 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:19:43,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-19 05:19:43,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-19 05:19:43,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 12 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 3 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-19 05:19:43,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2023-11-19 05:19:43,644 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2023-11-19 05:19:43,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:43,644 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2023-11-19 05:19:43,645 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 2.142857142857143) internal successors, (15), 8 states have internal predecessors, (15), 4 states have call successors, (4), 1 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-19 05:19:43,645 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2023-11-19 05:19:43,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-19 05:19:43,647 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:43,647 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:43,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:19:43,864 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:19:43,865 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:19:43,865 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:43,866 INFO L85 PathProgramCache]: Analyzing trace with hash -2123675004, now seen corresponding path program 2 times [2023-11-19 05:19:43,866 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:43,866 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1234746824] [2023-11-19 05:19:43,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:43,867 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:43,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:44,140 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-19 05:19:44,141 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:44,141 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1234746824] [2023-11-19 05:19:44,142 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1234746824] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:19:44,142 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [854009829] [2023-11-19 05:19:44,142 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:19:44,142 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:19:44,143 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:19:44,144 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:19:44,148 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:19:44,211 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-19 05:19:44,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:19:44,212 INFO L262 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 05:19:44,231 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:19:44,311 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-19 05:19:44,311 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:19:44,774 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 05:19:44,775 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [854009829] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:19:44,775 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2145974410] [2023-11-19 05:19:44,779 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-19 05:19:44,780 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:19:44,780 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-19 05:19:44,782 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:19:44,783 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2023-11-19 05:19:44,783 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56321272] [2023-11-19 05:19:44,784 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:19:44,786 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-19 05:19:44,787 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:44,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-19 05:19:44,791 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2023-11-19 05:19:44,792 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 11 states, 9 states have (on average 2.111111111111111) internal successors, (19), 10 states have internal predecessors, (19), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) [2023-11-19 05:19:44,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:44,876 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2023-11-19 05:19:44,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 05:19:44,877 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 9 states have (on average 2.111111111111111) internal successors, (19), 10 states have internal predecessors, (19), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) Word has length 21 [2023-11-19 05:19:44,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:44,878 INFO L225 Difference]: With dead ends: 24 [2023-11-19 05:19:44,878 INFO L226 Difference]: Without dead ends: 20 [2023-11-19 05:19:44,879 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 37 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2023-11-19 05:19:44,881 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 22 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:44,881 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 25 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:19:44,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-19 05:19:44,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-19 05:19:44,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 13 states have (on average 1.0769230769230769) internal successors, (14), 14 states have internal predecessors, (14), 2 states have call successors, (2), 1 states have call predecessors, (2), 4 states have return successors, (5), 4 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-19 05:19:44,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2023-11-19 05:19:44,889 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 21 [2023-11-19 05:19:44,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:44,891 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2023-11-19 05:19:44,896 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 9 states have (on average 2.111111111111111) internal successors, (19), 10 states have internal predecessors, (19), 5 states have call successors, (5), 1 states have call predecessors, (5), 3 states have return successors, (6), 3 states have call predecessors, (6), 5 states have call successors, (6) [2023-11-19 05:19:44,897 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2023-11-19 05:19:44,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-19 05:19:44,900 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:44,900 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:44,928 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:19:45,116 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:19:45,117 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:19:45,117 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:45,117 INFO L85 PathProgramCache]: Analyzing trace with hash 54189198, now seen corresponding path program 3 times [2023-11-19 05:19:45,118 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:45,118 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [884547471] [2023-11-19 05:19:45,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:45,118 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:45,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:45,345 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 05:19:45,345 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:45,346 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [884547471] [2023-11-19 05:19:45,346 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [884547471] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:19:45,346 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1382111401] [2023-11-19 05:19:45,346 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:19:45,347 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:19:45,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:19:45,348 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:19:45,376 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:19:45,418 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:19:45,418 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:19:45,419 INFO L262 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-19 05:19:45,422 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:19:45,473 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 05:19:45,473 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:19:46,192 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 05:19:46,193 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1382111401] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:19:46,194 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1001805748] [2023-11-19 05:19:46,199 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-19 05:19:46,199 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:19:46,200 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-19 05:19:46,201 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:19:46,201 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 13 [2023-11-19 05:19:46,202 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1996742562] [2023-11-19 05:19:46,202 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:19:46,203 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-19 05:19:46,203 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:46,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-19 05:19:46,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2023-11-19 05:19:46,207 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 12 states have internal predecessors, (23), 6 states have call successors, (6), 1 states have call predecessors, (6), 4 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) [2023-11-19 05:19:46,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:46,316 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2023-11-19 05:19:46,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 05:19:46,318 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 12 states have internal predecessors, (23), 6 states have call successors, (6), 1 states have call predecessors, (6), 4 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) Word has length 27 [2023-11-19 05:19:46,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:46,320 INFO L225 Difference]: With dead ends: 27 [2023-11-19 05:19:46,320 INFO L226 Difference]: Without dead ends: 23 [2023-11-19 05:19:46,322 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 48 SyntacticMatches, 4 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2023-11-19 05:19:46,326 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 13 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:46,326 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 35 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:19:46,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-19 05:19:46,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-11-19 05:19:46,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.0666666666666667) internal successors, (16), 16 states have internal predecessors, (16), 2 states have call successors, (2), 1 states have call predecessors, (2), 5 states have return successors, (6), 5 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 05:19:46,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2023-11-19 05:19:46,333 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 27 [2023-11-19 05:19:46,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:46,334 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2023-11-19 05:19:46,335 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 11 states have (on average 2.090909090909091) internal successors, (23), 12 states have internal predecessors, (23), 6 states have call successors, (6), 1 states have call predecessors, (6), 4 states have return successors, (8), 4 states have call predecessors, (8), 6 states have call successors, (8) [2023-11-19 05:19:46,335 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2023-11-19 05:19:46,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-19 05:19:46,337 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:46,337 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:46,359 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-19 05:19:46,549 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:19:46,550 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:19:46,550 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:46,550 INFO L85 PathProgramCache]: Analyzing trace with hash -1269749436, now seen corresponding path program 4 times [2023-11-19 05:19:46,551 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:46,551 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1772401845] [2023-11-19 05:19:46,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:46,551 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:46,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:46,895 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-19 05:19:46,895 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:46,897 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1772401845] [2023-11-19 05:19:46,897 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1772401845] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:19:46,901 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1076397603] [2023-11-19 05:19:46,901 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:19:46,901 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:19:46,903 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:19:46,904 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:19:46,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:19:46,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:46,986 INFO L262 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-19 05:19:46,993 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:19:47,066 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-19 05:19:47,066 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:19:48,117 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 05:19:48,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1076397603] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:19:48,119 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1935767122] [2023-11-19 05:19:48,123 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-19 05:19:48,124 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:19:48,125 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-19 05:19:48,127 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:19:48,127 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 15 [2023-11-19 05:19:48,127 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1430029927] [2023-11-19 05:19:48,128 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:19:48,129 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-19 05:19:48,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:48,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-19 05:19:48,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2023-11-19 05:19:48,132 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 15 states, 13 states have (on average 2.076923076923077) internal successors, (27), 14 states have internal predecessors, (27), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) [2023-11-19 05:19:48,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:48,255 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2023-11-19 05:19:48,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-19 05:19:48,256 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 13 states have (on average 2.076923076923077) internal successors, (27), 14 states have internal predecessors, (27), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) Word has length 33 [2023-11-19 05:19:48,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:48,258 INFO L225 Difference]: With dead ends: 30 [2023-11-19 05:19:48,258 INFO L226 Difference]: Without dead ends: 26 [2023-11-19 05:19:48,259 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 59 SyntacticMatches, 5 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2023-11-19 05:19:48,260 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 18 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:48,261 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 35 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:19:48,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-19 05:19:48,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-11-19 05:19:48,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 17 states have (on average 1.0588235294117647) internal successors, (18), 18 states have internal predecessors, (18), 2 states have call successors, (2), 1 states have call predecessors, (2), 6 states have return successors, (7), 6 states have call predecessors, (7), 2 states have call successors, (7) [2023-11-19 05:19:48,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2023-11-19 05:19:48,282 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 33 [2023-11-19 05:19:48,282 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:48,282 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2023-11-19 05:19:48,283 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 13 states have (on average 2.076923076923077) internal successors, (27), 14 states have internal predecessors, (27), 7 states have call successors, (7), 1 states have call predecessors, (7), 5 states have return successors, (10), 5 states have call predecessors, (10), 7 states have call successors, (10) [2023-11-19 05:19:48,283 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2023-11-19 05:19:48,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-11-19 05:19:48,286 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:48,287 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:48,312 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-11-19 05:19:48,512 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:19:48,512 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:19:48,513 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:48,513 INFO L85 PathProgramCache]: Analyzing trace with hash -4035634, now seen corresponding path program 5 times [2023-11-19 05:19:48,513 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:48,513 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1774803948] [2023-11-19 05:19:48,513 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:48,513 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:48,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:48,818 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-11-19 05:19:48,818 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:48,818 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1774803948] [2023-11-19 05:19:48,818 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1774803948] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:19:48,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [190728108] [2023-11-19 05:19:48,819 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:19:48,819 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:19:48,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:19:48,820 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:19:48,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:19:48,928 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-11-19 05:19:48,928 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:19:48,930 INFO L262 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-19 05:19:48,936 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:19:48,998 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-11-19 05:19:48,998 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:19:50,455 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-19 05:19:50,455 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [190728108] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:19:50,456 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [11642689] [2023-11-19 05:19:50,461 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-19 05:19:50,462 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:19:50,462 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-19 05:19:50,463 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:19:50,464 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 15] total 17 [2023-11-19 05:19:50,464 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380078496] [2023-11-19 05:19:50,464 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:19:50,465 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-19 05:19:50,465 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:50,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-19 05:19:50,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2023-11-19 05:19:50,466 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 17 states, 15 states have (on average 2.066666666666667) internal successors, (31), 16 states have internal predecessors, (31), 8 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (12), 6 states have call predecessors, (12), 8 states have call successors, (12) [2023-11-19 05:19:50,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:50,606 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2023-11-19 05:19:50,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:19:50,607 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 15 states have (on average 2.066666666666667) internal successors, (31), 16 states have internal predecessors, (31), 8 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (12), 6 states have call predecessors, (12), 8 states have call successors, (12) Word has length 39 [2023-11-19 05:19:50,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:50,617 INFO L225 Difference]: With dead ends: 33 [2023-11-19 05:19:50,617 INFO L226 Difference]: Without dead ends: 29 [2023-11-19 05:19:50,618 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 70 SyntacticMatches, 6 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2023-11-19 05:19:50,621 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 17 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:50,622 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 47 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:19:50,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-11-19 05:19:50,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2023-11-19 05:19:50,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 19 states have (on average 1.0526315789473684) internal successors, (20), 20 states have internal predecessors, (20), 2 states have call successors, (2), 1 states have call predecessors, (2), 7 states have return successors, (8), 7 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-19 05:19:50,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2023-11-19 05:19:50,637 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 39 [2023-11-19 05:19:50,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:50,637 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2023-11-19 05:19:50,638 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 15 states have (on average 2.066666666666667) internal successors, (31), 16 states have internal predecessors, (31), 8 states have call successors, (8), 1 states have call predecessors, (8), 6 states have return successors, (12), 6 states have call predecessors, (12), 8 states have call successors, (12) [2023-11-19 05:19:50,638 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2023-11-19 05:19:50,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-11-19 05:19:50,639 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:50,640 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:50,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 05:19:50,855 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:19:50,856 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:19:50,856 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:50,856 INFO L85 PathProgramCache]: Analyzing trace with hash -1047611388, now seen corresponding path program 6 times [2023-11-19 05:19:50,856 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:50,856 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042715602] [2023-11-19 05:19:50,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:50,857 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:50,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:51,066 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-11-19 05:19:51,066 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:51,066 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042715602] [2023-11-19 05:19:51,067 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1042715602] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:19:51,067 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1073771326] [2023-11-19 05:19:51,068 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:19:51,070 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:19:51,071 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:19:51,072 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:19:51,076 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:19:51,176 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:19:51,176 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:19:51,177 INFO L262 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-19 05:19:51,182 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:19:51,245 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-11-19 05:19:51,245 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:19:53,454 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-19 05:19:53,454 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1073771326] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:19:53,454 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1099962428] [2023-11-19 05:19:53,457 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-19 05:19:53,457 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:19:53,457 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-19 05:19:53,458 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:19:53,458 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 17] total 19 [2023-11-19 05:19:53,458 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [900875206] [2023-11-19 05:19:53,458 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:19:53,459 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-19 05:19:53,459 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:53,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-19 05:19:53,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2023-11-19 05:19:53,461 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand has 19 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 18 states have internal predecessors, (35), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (14), 7 states have call predecessors, (14), 9 states have call successors, (14) [2023-11-19 05:19:53,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:53,624 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2023-11-19 05:19:53,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-19 05:19:53,624 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 18 states have internal predecessors, (35), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (14), 7 states have call predecessors, (14), 9 states have call successors, (14) Word has length 45 [2023-11-19 05:19:53,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:53,626 INFO L225 Difference]: With dead ends: 36 [2023-11-19 05:19:53,626 INFO L226 Difference]: Without dead ends: 32 [2023-11-19 05:19:53,627 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 81 SyntacticMatches, 7 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2023-11-19 05:19:53,628 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 52 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:53,628 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 45 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:19:53,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-11-19 05:19:53,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-11-19 05:19:53,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 21 states have (on average 1.0476190476190477) internal successors, (22), 22 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 8 states have return successors, (9), 8 states have call predecessors, (9), 2 states have call successors, (9) [2023-11-19 05:19:53,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2023-11-19 05:19:53,635 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 45 [2023-11-19 05:19:53,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:53,635 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2023-11-19 05:19:53,636 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 18 states have internal predecessors, (35), 9 states have call successors, (9), 1 states have call predecessors, (9), 7 states have return successors, (14), 7 states have call predecessors, (14), 9 states have call successors, (14) [2023-11-19 05:19:53,636 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2023-11-19 05:19:53,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-11-19 05:19:53,638 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:53,638 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:53,662 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 05:19:53,852 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:19:53,853 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:19:53,853 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:53,853 INFO L85 PathProgramCache]: Analyzing trace with hash 1466649358, now seen corresponding path program 7 times [2023-11-19 05:19:53,853 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:53,853 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [487471479] [2023-11-19 05:19:53,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:53,854 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:53,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:54,161 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2023-11-19 05:19:54,162 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:54,162 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [487471479] [2023-11-19 05:19:54,162 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [487471479] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:19:54,162 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1266377525] [2023-11-19 05:19:54,162 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:19:54,163 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:19:54,163 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:19:54,164 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:19:54,167 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 05:19:54,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:54,302 INFO L262 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-19 05:19:54,313 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:19:54,387 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2023-11-19 05:19:54,388 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:19:57,190 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-11-19 05:19:57,191 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1266377525] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:19:57,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [173969936] [2023-11-19 05:19:57,197 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-19 05:19:57,197 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:19:57,198 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-19 05:19:57,199 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:19:57,199 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 19] total 21 [2023-11-19 05:19:57,199 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798861606] [2023-11-19 05:19:57,199 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:19:57,200 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-19 05:19:57,201 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:19:57,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-19 05:19:57,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2023-11-19 05:19:57,203 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand has 21 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 20 states have internal predecessors, (39), 10 states have call successors, (10), 1 states have call predecessors, (10), 8 states have return successors, (16), 8 states have call predecessors, (16), 10 states have call successors, (16) [2023-11-19 05:19:57,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:19:57,364 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2023-11-19 05:19:57,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-19 05:19:57,367 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 20 states have internal predecessors, (39), 10 states have call successors, (10), 1 states have call predecessors, (10), 8 states have return successors, (16), 8 states have call predecessors, (16), 10 states have call successors, (16) Word has length 51 [2023-11-19 05:19:57,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:19:57,370 INFO L225 Difference]: With dead ends: 39 [2023-11-19 05:19:57,370 INFO L226 Difference]: Without dead ends: 35 [2023-11-19 05:19:57,371 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 92 SyntacticMatches, 8 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2023-11-19 05:19:57,373 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 21 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:19:57,374 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 51 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:19:57,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-11-19 05:19:57,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2023-11-19 05:19:57,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 23 states have (on average 1.0434782608695652) internal successors, (24), 24 states have internal predecessors, (24), 2 states have call successors, (2), 1 states have call predecessors, (2), 9 states have return successors, (10), 9 states have call predecessors, (10), 2 states have call successors, (10) [2023-11-19 05:19:57,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2023-11-19 05:19:57,388 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 51 [2023-11-19 05:19:57,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:19:57,389 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2023-11-19 05:19:57,389 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 19 states have (on average 2.0526315789473686) internal successors, (39), 20 states have internal predecessors, (39), 10 states have call successors, (10), 1 states have call predecessors, (10), 8 states have return successors, (16), 8 states have call predecessors, (16), 10 states have call successors, (16) [2023-11-19 05:19:57,389 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2023-11-19 05:19:57,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-11-19 05:19:57,395 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:19:57,395 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:19:57,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 05:19:57,615 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:19:57,615 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:19:57,616 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:19:57,616 INFO L85 PathProgramCache]: Analyzing trace with hash 335541956, now seen corresponding path program 8 times [2023-11-19 05:19:57,616 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:19:57,616 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [236698065] [2023-11-19 05:19:57,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:19:57,617 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:19:57,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:19:57,931 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2023-11-19 05:19:57,931 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:19:57,931 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [236698065] [2023-11-19 05:19:57,931 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [236698065] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:19:57,931 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [793141780] [2023-11-19 05:19:57,932 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:19:57,932 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:19:57,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:19:57,937 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:19:57,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 05:19:58,101 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2023-11-19 05:19:58,101 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:19:58,103 INFO L262 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-19 05:19:58,111 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:19:58,197 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2023-11-19 05:19:58,197 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:20:01,950 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-19 05:20:01,951 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [793141780] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:20:01,951 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [80003723] [2023-11-19 05:20:01,953 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-19 05:20:01,954 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:20:01,954 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-19 05:20:01,955 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:20:01,955 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 21] total 23 [2023-11-19 05:20:01,956 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96667730] [2023-11-19 05:20:01,956 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:20:01,957 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-19 05:20:01,957 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:01,958 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-19 05:20:01,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2023-11-19 05:20:01,959 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand has 23 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 22 states have internal predecessors, (43), 11 states have call successors, (11), 1 states have call predecessors, (11), 9 states have return successors, (18), 9 states have call predecessors, (18), 11 states have call successors, (18) [2023-11-19 05:20:02,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:02,152 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2023-11-19 05:20:02,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-19 05:20:02,152 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 22 states have internal predecessors, (43), 11 states have call successors, (11), 1 states have call predecessors, (11), 9 states have return successors, (18), 9 states have call predecessors, (18), 11 states have call successors, (18) Word has length 57 [2023-11-19 05:20:02,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:02,158 INFO L225 Difference]: With dead ends: 42 [2023-11-19 05:20:02,158 INFO L226 Difference]: Without dead ends: 38 [2023-11-19 05:20:02,159 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 103 SyntacticMatches, 9 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2023-11-19 05:20:02,162 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 87 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 113 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:02,163 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [98 Valid, 51 Invalid, 113 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:20:02,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-11-19 05:20:02,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2023-11-19 05:20:02,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 25 states have (on average 1.04) internal successors, (26), 26 states have internal predecessors, (26), 2 states have call successors, (2), 1 states have call predecessors, (2), 10 states have return successors, (11), 10 states have call predecessors, (11), 2 states have call successors, (11) [2023-11-19 05:20:02,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2023-11-19 05:20:02,181 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 57 [2023-11-19 05:20:02,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:02,181 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2023-11-19 05:20:02,182 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 22 states have internal predecessors, (43), 11 states have call successors, (11), 1 states have call predecessors, (11), 9 states have return successors, (18), 9 states have call predecessors, (18), 11 states have call successors, (18) [2023-11-19 05:20:02,182 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2023-11-19 05:20:02,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-11-19 05:20:02,189 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:02,190 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:02,220 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-19 05:20:02,411 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:02,412 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:02,412 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:02,412 INFO L85 PathProgramCache]: Analyzing trace with hash -682001842, now seen corresponding path program 9 times [2023-11-19 05:20:02,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:02,412 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [74809072] [2023-11-19 05:20:02,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:02,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:02,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:02,784 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2023-11-19 05:20:02,784 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:02,785 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [74809072] [2023-11-19 05:20:02,785 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [74809072] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:20:02,785 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1612519035] [2023-11-19 05:20:02,785 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:20:02,785 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:02,786 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:20:02,787 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:20:02,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-19 05:20:03,016 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:20:03,016 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:20:03,018 INFO L262 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-19 05:20:03,022 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:20:03,103 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2023-11-19 05:20:03,104 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:20:08,354 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-19 05:20:08,354 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1612519035] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:20:08,354 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [857082509] [2023-11-19 05:20:08,356 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-19 05:20:08,356 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:20:08,357 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-19 05:20:08,358 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:20:08,358 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 24 [2023-11-19 05:20:08,359 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [90519355] [2023-11-19 05:20:08,359 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:20:08,360 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-19 05:20:08,360 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:08,361 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-19 05:20:08,361 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2023-11-19 05:20:08,362 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 24 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 11 states have call successors, (11), 1 states have call predecessors, (11), 10 states have return successors, (19), 10 states have call predecessors, (19), 11 states have call successors, (19) [2023-11-19 05:20:08,572 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:08,572 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2023-11-19 05:20:08,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-19 05:20:08,573 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 11 states have call successors, (11), 1 states have call predecessors, (11), 10 states have return successors, (19), 10 states have call predecessors, (19), 11 states have call successors, (19) Word has length 63 [2023-11-19 05:20:08,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:08,574 INFO L225 Difference]: With dead ends: 45 [2023-11-19 05:20:08,574 INFO L226 Difference]: Without dead ends: 41 [2023-11-19 05:20:08,575 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 114 SyntacticMatches, 11 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=385, Invalid=737, Unknown=0, NotChecked=0, Total=1122 [2023-11-19 05:20:08,576 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 77 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:08,577 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 57 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:20:08,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-11-19 05:20:08,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-11-19 05:20:08,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 27 states have (on average 1.037037037037037) internal successors, (28), 28 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 11 states have return successors, (12), 11 states have call predecessors, (12), 2 states have call successors, (12) [2023-11-19 05:20:08,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2023-11-19 05:20:08,583 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 63 [2023-11-19 05:20:08,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:08,583 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2023-11-19 05:20:08,584 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 23 states have (on average 2.0) internal successors, (46), 23 states have internal predecessors, (46), 11 states have call successors, (11), 1 states have call predecessors, (11), 10 states have return successors, (19), 10 states have call predecessors, (19), 11 states have call successors, (19) [2023-11-19 05:20:08,584 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2023-11-19 05:20:08,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2023-11-19 05:20:08,585 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:20:08,585 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:20:08,609 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-19 05:20:08,808 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-19 05:20:08,809 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:20:08,809 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:20:08,809 INFO L85 PathProgramCache]: Analyzing trace with hash 1904272772, now seen corresponding path program 10 times [2023-11-19 05:20:08,809 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:20:08,810 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2058310760] [2023-11-19 05:20:08,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:20:08,810 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:20:08,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:10,333 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 135 proven. 39 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2023-11-19 05:20:10,333 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:20:10,334 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2058310760] [2023-11-19 05:20:10,334 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2058310760] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:20:10,334 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [666989420] [2023-11-19 05:20:10,334 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:20:10,334 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:20:10,334 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:20:10,337 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:20:10,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-19 05:20:10,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:20:10,652 INFO L262 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 97 conjunts are in the unsatisfiable core [2023-11-19 05:20:10,661 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:20:11,957 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 19 proven. 155 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2023-11-19 05:20:11,958 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:20:16,281 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 174 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2023-11-19 05:20:16,282 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [666989420] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:20:16,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1399388545] [2023-11-19 05:20:16,288 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-19 05:20:16,289 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:20:16,289 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-19 05:20:16,290 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:20:16,290 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 59 [2023-11-19 05:20:16,291 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [337487721] [2023-11-19 05:20:16,291 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:20:16,292 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2023-11-19 05:20:16,292 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:20:16,293 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2023-11-19 05:20:16,295 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=3203, Unknown=0, NotChecked=0, Total=3422 [2023-11-19 05:20:16,296 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand has 59 states, 54 states have (on average 1.1666666666666667) internal successors, (63), 36 states have internal predecessors, (63), 7 states have call successors, (7), 1 states have call predecessors, (7), 23 states have return successors, (24), 22 states have call predecessors, (24), 7 states have call successors, (24) [2023-11-19 05:20:17,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:20:17,990 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2023-11-19 05:20:17,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-11-19 05:20:17,991 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 54 states have (on average 1.1666666666666667) internal successors, (63), 36 states have internal predecessors, (63), 7 states have call successors, (7), 1 states have call predecessors, (7), 23 states have return successors, (24), 22 states have call predecessors, (24), 7 states have call successors, (24) Word has length 69 [2023-11-19 05:20:17,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:20:17,992 INFO L225 Difference]: With dead ends: 44 [2023-11-19 05:20:17,992 INFO L226 Difference]: Without dead ends: 0 [2023-11-19 05:20:17,996 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1398 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=664, Invalid=6308, Unknown=0, NotChecked=0, Total=6972 [2023-11-19 05:20:17,997 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 118 mSDsluCounter, 336 mSDsCounter, 0 mSdLazyCounter, 924 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 119 SdHoareTripleChecker+Valid, 350 SdHoareTripleChecker+Invalid, 986 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 924 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-19 05:20:17,998 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [119 Valid, 350 Invalid, 986 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 924 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-19 05:20:17,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2023-11-19 05:20:17,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2023-11-19 05:20:17,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:20:17,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2023-11-19 05:20:17,999 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 69 [2023-11-19 05:20:17,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:20:17,999 INFO L495 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2023-11-19 05:20:18,000 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 54 states have (on average 1.1666666666666667) internal successors, (63), 36 states have internal predecessors, (63), 7 states have call successors, (7), 1 states have call predecessors, (7), 23 states have return successors, (24), 22 states have call predecessors, (24), 7 states have call successors, (24) [2023-11-19 05:20:18,000 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2023-11-19 05:20:18,000 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2023-11-19 05:20:18,003 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-11-19 05:20:18,029 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-19 05:20:18,228 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-19 05:20:18,230 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2023-11-19 05:20:18,258 INFO L899 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2023-11-19 05:20:18,258 INFO L899 garLoopResultBuilder]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 18) no Hoare annotation was computed. [2023-11-19 05:20:18,258 INFO L899 garLoopResultBuilder]: For program point L18(line 18) no Hoare annotation was computed. [2023-11-19 05:20:18,259 INFO L899 garLoopResultBuilder]: For program point L17(lines 17 19) no Hoare annotation was computed. [2023-11-19 05:20:18,259 INFO L895 garLoopResultBuilder]: At program point L16(line 16) the Hoare annotation is: (= |ULTIMATE.start_main_~a~0#1| 10) [2023-11-19 05:20:18,259 INFO L899 garLoopResultBuilder]: For program point L16-1(line 16) no Hoare annotation was computed. [2023-11-19 05:20:18,259 INFO L899 garLoopResultBuilder]: For program point L13(lines 13 20) no Hoare annotation was computed. [2023-11-19 05:20:18,260 INFO L899 garLoopResultBuilder]: For program point $Ultimate##0(line -1) no Hoare annotation was computed. [2023-11-19 05:20:18,260 INFO L899 garLoopResultBuilder]: For program point sumEXIT(lines 5 11) no Hoare annotation was computed. [2023-11-19 05:20:18,260 INFO L902 garLoopResultBuilder]: At program point $Ultimate##0(lines 5 11) the Hoare annotation is: true [2023-11-19 05:20:18,260 INFO L895 garLoopResultBuilder]: At program point L9(line 9) the Hoare annotation is: (and (= sum_~m |sum_#in~m|) (<= 1 sum_~n) (= (+ sum_~n sum_~m) (+ |sum_#in~n| |sum_#in~m|))) [2023-11-19 05:20:18,261 INFO L899 garLoopResultBuilder]: For program point L9-1(line 9) no Hoare annotation was computed. [2023-11-19 05:20:18,261 INFO L899 garLoopResultBuilder]: For program point L6(lines 6 10) no Hoare annotation was computed. [2023-11-19 05:20:18,261 INFO L899 garLoopResultBuilder]: For program point sumFINAL(lines 5 11) no Hoare annotation was computed. [2023-11-19 05:20:18,265 INFO L445 BasicCegarLoop]: Path program histogram: [10, 1] [2023-11-19 05:20:18,267 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2023-11-19 05:20:18,272 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.11 05:20:18 BoogieIcfgContainer [2023-11-19 05:20:18,273 INFO L131 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2023-11-19 05:20:18,273 INFO L112 PluginConnector]: ------------------------Witness Printer---------------------------- [2023-11-19 05:20:18,273 INFO L270 PluginConnector]: Initializing Witness Printer... [2023-11-19 05:20:18,274 INFO L274 PluginConnector]: Witness Printer initialized [2023-11-19 05:20:18,274 INFO L184 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:19:42" (3/4) ... [2023-11-19 05:20:18,276 INFO L137 WitnessPrinter]: Generating witness for correct program [2023-11-19 05:20:18,281 INFO L361 RCFGBacktranslator]: Ignoring RootEdge to procedure sum [2023-11-19 05:20:18,286 INFO L943 BoogieBacktranslator]: Reduced CFG by removing 13 nodes and edges [2023-11-19 05:20:18,286 INFO L943 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2023-11-19 05:20:18,287 INFO L943 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2023-11-19 05:20:18,287 INFO L943 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2023-11-19 05:20:18,388 INFO L149 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/witness.graphml [2023-11-19 05:20:18,389 INFO L149 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/witness.yml [2023-11-19 05:20:18,389 INFO L131 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2023-11-19 05:20:18,390 INFO L158 Benchmark]: Toolchain (without parser) took 37075.17ms. Allocated memory was 184.5MB in the beginning and 323.0MB in the end (delta: 138.4MB). Free memory was 153.2MB in the beginning and 221.6MB in the end (delta: -68.4MB). Peak memory consumption was 69.0MB. Max. memory is 16.1GB. [2023-11-19 05:20:18,390 INFO L158 Benchmark]: CDTParser took 0.23ms. Allocated memory is still 121.6MB. Free memory is still 88.6MB. There was no memory consumed. Max. memory is 16.1GB. [2023-11-19 05:20:18,391 INFO L158 Benchmark]: CACSL2BoogieTranslator took 383.50ms. Allocated memory is still 184.5MB. Free memory was 152.2MB in the beginning and 147.8MB in the end (delta: 4.4MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2023-11-19 05:20:18,391 INFO L158 Benchmark]: Boogie Procedure Inliner took 49.97ms. Allocated memory is still 184.5MB. Free memory was 147.8MB in the beginning and 145.7MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-11-19 05:20:18,391 INFO L158 Benchmark]: Boogie Preprocessor took 27.96ms. Allocated memory is still 184.5MB. Free memory was 145.7MB in the beginning and 144.7MB in the end (delta: 1.0MB). There was no memory consumed. Max. memory is 16.1GB. [2023-11-19 05:20:18,392 INFO L158 Benchmark]: RCFGBuilder took 388.51ms. Allocated memory is still 184.5MB. Free memory was 144.7MB in the beginning and 135.2MB in the end (delta: 9.4MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2023-11-19 05:20:18,392 INFO L158 Benchmark]: TraceAbstraction took 36101.03ms. Allocated memory was 184.5MB in the beginning and 323.0MB in the end (delta: 138.4MB). Free memory was 134.2MB in the beginning and 225.8MB in the end (delta: -91.6MB). Peak memory consumption was 49.9MB. Max. memory is 16.1GB. [2023-11-19 05:20:18,393 INFO L158 Benchmark]: Witness Printer took 115.81ms. Allocated memory is still 323.0MB. Free memory was 225.8MB in the beginning and 221.6MB in the end (delta: 4.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2023-11-19 05:20:18,395 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23ms. Allocated memory is still 121.6MB. Free memory is still 88.6MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 383.50ms. Allocated memory is still 184.5MB. Free memory was 152.2MB in the beginning and 147.8MB in the end (delta: 4.4MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 49.97ms. Allocated memory is still 184.5MB. Free memory was 147.8MB in the beginning and 145.7MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 27.96ms. Allocated memory is still 184.5MB. Free memory was 145.7MB in the beginning and 144.7MB in the end (delta: 1.0MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 388.51ms. Allocated memory is still 184.5MB. Free memory was 144.7MB in the beginning and 135.2MB in the end (delta: 9.4MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * TraceAbstraction took 36101.03ms. Allocated memory was 184.5MB in the beginning and 323.0MB in the end (delta: 138.4MB). Free memory was 134.2MB in the beginning and 225.8MB in the end (delta: -91.6MB). Peak memory consumption was 49.9MB. Max. memory is 16.1GB. * Witness Printer took 115.81ms. Allocated memory is still 323.0MB. Free memory was 225.8MB in the beginning and 221.6MB in the end (delta: 4.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 18]: a call to reach_error is unreachable For all program executions holds that a call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 14 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 36.0s, OverallIterations: 11, TraceHistogramMax: 11, PathProgramHistogramMax: 10, EmptinessCheckTime: 0.0s, AutomataDifference: 3.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 519 SdHoareTripleChecker+Valid, 1.3s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 443 mSDsluCounter, 738 SdHoareTripleChecker+Invalid, 1.1s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 654 mSDsCounter, 158 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 1528 IncrementalHoareTripleChecker+Invalid, 1686 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 158 mSolverCounterUnsat, 84 mSDtfsCounter, 1528 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 1078 GetRequests, 749 SyntacticMatches, 55 SemanticMatches, 274 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2467 ImplicationChecksByTransitivity, 5.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=41occurred in iteration=10, InterpolantAutomatonStates: 125, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 11 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 3 LocationsWithAnnotation, 5 PreInvPairs, 5 NumberOfFragments, 18 HoareAnnotationTreeSize, 5 FomulaSimplifications, 4 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 3 FomulaSimplificationsInter, 3 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 28.3s InterpolantComputationTime, 849 NumberOfCodeBlocks, 849 NumberOfCodeBlocksAsserted, 39 NumberOfCheckSat, 1238 ConstructedInterpolants, 0 QuantifiedInterpolants, 4193 SizeOfPredicates, 68 NumberOfNonLiveVariables, 1460 ConjunctsInSsa, 223 ConjunctsInUnsatCore, 31 InterpolantComputations, 1 PerfectInterpolantSequences, 1627/3630 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! [2023-11-19 05:20:18,441 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ca5facc6-6561-4d15-9ed0-5b43a1e2c872/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE