./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 527bcce2 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_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/config/TaipanReach.xml -i ../../sv-benchmarks/c/recursive-simple/sum_10x0-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5 --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 68d0cd7d514b491e1404560081afc21267eb1b3dae98cdb9832a8634357d65e4 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 19:45:13,214 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 19:45:13,345 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-21 19:45:13,352 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 19:45:13,353 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 19:45:13,394 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 19:45:13,395 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 19:45:13,395 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 19:45:13,396 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 19:45:13,404 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 19:45:13,404 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-21 19:45:13,406 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-21 19:45:13,406 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-21 19:45:13,408 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-21 19:45:13,409 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-21 19:45:13,409 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-21 19:45:13,410 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-21 19:45:13,410 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-21 19:45:13,410 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-21 19:45:13,411 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-21 19:45:13,411 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-21 19:45:13,412 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-21 19:45:13,413 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 19:45:13,414 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 19:45:13,414 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 19:45:13,415 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 19:45:13,415 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 19:45:13,416 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 19:45:13,416 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 19:45:13,417 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 19:45:13,418 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 19:45:13,418 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 19:45:13,419 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 19:45:13,419 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 19:45:13,419 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 19:45:13,420 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 19:45:13,420 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 19:45:13,420 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:45:13,420 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 19:45:13,421 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 19:45:13,421 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 19:45:13,421 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-21 19:45:13,422 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 19:45:13,422 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 19:45:13,423 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 19:45:13,423 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-21 19:45:13,423 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 19:45:13,423 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_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 68d0cd7d514b491e1404560081afc21267eb1b3dae98cdb9832a8634357d65e4 [2023-11-21 19:45:13,707 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 19:45:13,728 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 19:45:13,731 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 19:45:13,732 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 19:45:13,733 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 19:45:13,734 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/../../sv-benchmarks/c/recursive-simple/sum_10x0-1.c [2023-11-21 19:45:16,921 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 19:45:17,145 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 19:45:17,146 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/sv-benchmarks/c/recursive-simple/sum_10x0-1.c [2023-11-21 19:45:17,154 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/data/eefd04d40/7fdb221193724a1ab3fe0746636da385/FLAGcc5168098 [2023-11-21 19:45:17,169 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/data/eefd04d40/7fdb221193724a1ab3fe0746636da385 [2023-11-21 19:45:17,172 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 19:45:17,174 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 19:45:17,176 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 19:45:17,176 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 19:45:17,182 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 19:45:17,182 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:45:17" (1/1) ... [2023-11-21 19:45:17,184 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28d44125 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:17, skipping insertion in model container [2023-11-21 19:45:17,184 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:45:17" (1/1) ... [2023-11-21 19:45:17,204 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 19:45:17,391 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_a1898e71-2944-4224-9a21-fef792701287/sv-benchmarks/c/recursive-simple/sum_10x0-1.c[481,494] [2023-11-21 19:45:17,396 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:45:17,413 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 19:45:17,432 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_a1898e71-2944-4224-9a21-fef792701287/sv-benchmarks/c/recursive-simple/sum_10x0-1.c[481,494] [2023-11-21 19:45:17,434 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:45:17,449 INFO L206 MainTranslator]: Completed translation [2023-11-21 19:45:17,449 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:17 WrapperNode [2023-11-21 19:45:17,449 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 19:45:17,450 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 19:45:17,451 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 19:45:17,451 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 19:45:17,459 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:17" (1/1) ... [2023-11-21 19:45:17,468 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:17" (1/1) ... [2023-11-21 19:45:17,490 INFO L138 Inliner]: procedures = 12, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 19 [2023-11-21 19:45:17,490 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 19:45:17,491 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 19:45:17,491 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 19:45:17,492 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 19:45:17,501 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:17" (1/1) ... [2023-11-21 19:45:17,502 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:17" (1/1) ... [2023-11-21 19:45:17,503 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:17" (1/1) ... [2023-11-21 19:45:17,504 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:17" (1/1) ... [2023-11-21 19:45:17,509 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:17" (1/1) ... [2023-11-21 19:45:17,510 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:17" (1/1) ... [2023-11-21 19:45:17,518 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:17" (1/1) ... [2023-11-21 19:45:17,519 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:17" (1/1) ... [2023-11-21 19:45:17,521 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 19:45:17,523 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 19:45:17,523 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 19:45:17,523 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 19:45:17,524 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:17" (1/1) ... [2023-11-21 19:45:17,530 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:45:17,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:17,557 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 19:45:17,577 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 19:45:17,597 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 19:45:17,597 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 19:45:17,597 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 19:45:17,598 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2023-11-21 19:45:17,600 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2023-11-21 19:45:17,600 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 19:45:17,661 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 19:45:17,664 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 19:45:17,772 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 19:45:17,792 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 19:45:17,792 INFO L308 CfgBuilder]: Removed 0 assume(true) statements. [2023-11-21 19:45:17,794 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:45:17 BoogieIcfgContainer [2023-11-21 19:45:17,795 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 19:45:17,798 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 19:45:17,799 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 19:45:17,802 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 19:45:17,803 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 07:45:17" (1/3) ... [2023-11-21 19:45:17,804 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6301fe83 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:45:17, skipping insertion in model container [2023-11-21 19:45:17,804 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:45:17" (2/3) ... [2023-11-21 19:45:17,805 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6301fe83 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:45:17, skipping insertion in model container [2023-11-21 19:45:17,805 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:45:17" (3/3) ... [2023-11-21 19:45:17,806 INFO L112 eAbstractionObserver]: Analyzing ICFG sum_10x0-1.c [2023-11-21 19:45:17,828 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 19:45:17,829 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-21 19:45:17,875 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 19:45:17,882 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;@2f755737, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 19:45:17,883 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-21 19:45:17,886 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) [2023-11-21 19:45:17,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-21 19:45:17,893 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:17,894 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:17,895 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:17,900 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:17,901 INFO L85 PathProgramCache]: Analyzing trace with hash 1493244868, now seen corresponding path program 1 times [2023-11-21 19:45:17,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:17,909 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681921731] [2023-11-21 19:45:17,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:17,910 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:18,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:18,273 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:45:18,274 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:18,274 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681921731] [2023-11-21 19:45:18,275 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1681921731] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:45:18,275 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:45:18,276 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-21 19:45:18,277 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [879826297] [2023-11-21 19:45:18,278 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:45:18,282 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 19:45:18,285 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:18,332 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 19:45:18,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:45:18,335 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) [2023-11-21 19:45:18,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:18,474 INFO L93 Difference]: Finished difference Result 22 states and 25 transitions. [2023-11-21 19:45:18,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-21 19:45:18,477 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2023-11-21 19:45:18,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:18,486 INFO L225 Difference]: With dead ends: 22 [2023-11-21 19:45:18,486 INFO L226 Difference]: Without dead ends: 14 [2023-11-21 19:45:18,489 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-21 19:45:18,494 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 [2023-11-21 19:45:18,495 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] [2023-11-21 19:45:18,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-11-21 19:45:18,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2023-11-21 19:45:18,536 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) [2023-11-21 19:45:18,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2023-11-21 19:45:18,538 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2023-11-21 19:45:18,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:18,538 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2023-11-21 19:45:18,539 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.75) internal successors, (7), 4 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-21 19:45:18,539 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2023-11-21 19:45:18,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-21 19:45:18,541 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:18,541 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:18,541 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 19:45:18,542 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:18,542 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:18,543 INFO L85 PathProgramCache]: Analyzing trace with hash -642736818, now seen corresponding path program 1 times [2023-11-21 19:45:18,543 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:18,543 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1757054096] [2023-11-21 19:45:18,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:18,544 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:18,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:18,689 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:45:18,689 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:18,690 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1757054096] [2023-11-21 19:45:18,691 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1757054096] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:18,692 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1606516482] [2023-11-21 19:45:18,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:18,692 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:18,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:18,699 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:18,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 19:45:18,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:18,790 INFO L262 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-21 19:45:18,805 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:18,883 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-21 19:45:18,883 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:19,099 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 19:45:19,100 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1606516482] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:19,100 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1615131526] [2023-11-21 19:45:19,124 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-21 19:45:19,125 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:19,129 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-21 19:45:19,132 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:19,132 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 7] total 9 [2023-11-21 19:45:19,133 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [76069438] [2023-11-21 19:45:19,133 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:19,134 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-21 19:45:19,134 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:19,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-21 19:45:19,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2023-11-21 19:45:19,136 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) [2023-11-21 19:45:19,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:19,189 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2023-11-21 19:45:19,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:45:19,190 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 [2023-11-21 19:45:19,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:19,191 INFO L225 Difference]: With dead ends: 21 [2023-11-21 19:45:19,191 INFO L226 Difference]: Without dead ends: 17 [2023-11-21 19:45:19,192 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 [2023-11-21 19:45:19,194 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 [2023-11-21 19:45:19,194 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] [2023-11-21 19:45:19,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-21 19:45:19,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-21 19:45:19,199 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) [2023-11-21 19:45:19,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2023-11-21 19:45:19,200 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 15 [2023-11-21 19:45:19,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:19,201 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2023-11-21 19:45:19,201 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) [2023-11-21 19:45:19,202 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2023-11-21 19:45:19,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-21 19:45:19,203 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:19,203 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:19,229 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:19,423 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:19,424 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:19,424 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:19,425 INFO L85 PathProgramCache]: Analyzing trace with hash -2123675004, now seen corresponding path program 2 times [2023-11-21 19:45:19,425 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:19,425 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1705391947] [2023-11-21 19:45:19,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:19,426 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:19,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:19,686 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-21 19:45:19,686 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:19,687 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1705391947] [2023-11-21 19:45:19,688 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1705391947] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:19,688 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [529277039] [2023-11-21 19:45:19,689 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:45:19,689 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:19,689 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:19,691 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:19,711 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 19:45:19,772 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-21 19:45:19,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:45:19,779 INFO L262 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-21 19:45:19,781 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:19,830 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-21 19:45:19,830 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:20,276 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 19:45:20,277 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [529277039] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:20,277 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2112344] [2023-11-21 19:45:20,281 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-21 19:45:20,282 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:20,282 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-21 19:45:20,284 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:20,284 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 11 [2023-11-21 19:45:20,285 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503568865] [2023-11-21 19:45:20,285 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:20,285 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-21 19:45:20,286 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:20,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-21 19:45:20,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2023-11-21 19:45:20,288 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) [2023-11-21 19:45:20,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:20,355 INFO L93 Difference]: Finished difference Result 24 states and 25 transitions. [2023-11-21 19:45:20,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-21 19:45:20,360 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 [2023-11-21 19:45:20,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:20,361 INFO L225 Difference]: With dead ends: 24 [2023-11-21 19:45:20,362 INFO L226 Difference]: Without dead ends: 20 [2023-11-21 19:45:20,362 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 [2023-11-21 19:45:20,366 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 [2023-11-21 19:45:20,368 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] [2023-11-21 19:45:20,370 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-21 19:45:20,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-21 19:45:20,378 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) [2023-11-21 19:45:20,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2023-11-21 19:45:20,380 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 21 [2023-11-21 19:45:20,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:20,381 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2023-11-21 19:45:20,381 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) [2023-11-21 19:45:20,385 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2023-11-21 19:45:20,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-21 19:45:20,388 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:20,388 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:20,418 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:20,607 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:20,608 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:20,608 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:20,608 INFO L85 PathProgramCache]: Analyzing trace with hash 54189198, now seen corresponding path program 3 times [2023-11-21 19:45:20,609 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:20,609 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209290988] [2023-11-21 19:45:20,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:20,609 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:20,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:20,832 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-21 19:45:20,833 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:20,833 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209290988] [2023-11-21 19:45:20,836 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [209290988] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:20,836 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1802482031] [2023-11-21 19:45:20,836 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-21 19:45:20,836 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:20,837 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:20,840 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:20,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 19:45:20,924 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-21 19:45:20,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:45:20,926 INFO L262 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-21 19:45:20,928 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:20,986 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-21 19:45:20,986 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:21,592 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 19:45:21,592 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1802482031] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:21,593 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1850259569] [2023-11-21 19:45:21,595 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-21 19:45:21,595 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:21,596 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-21 19:45:21,596 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:21,596 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 11] total 13 [2023-11-21 19:45:21,597 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739071158] [2023-11-21 19:45:21,597 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:21,597 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-21 19:45:21,597 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:21,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-21 19:45:21,599 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2023-11-21 19:45:21,599 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) [2023-11-21 19:45:21,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:21,694 INFO L93 Difference]: Finished difference Result 27 states and 28 transitions. [2023-11-21 19:45:21,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-21 19:45:21,695 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 [2023-11-21 19:45:21,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:21,697 INFO L225 Difference]: With dead ends: 27 [2023-11-21 19:45:21,697 INFO L226 Difference]: Without dead ends: 23 [2023-11-21 19:45:21,698 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 [2023-11-21 19:45:21,702 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 [2023-11-21 19:45:21,706 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] [2023-11-21 19:45:21,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-21 19:45:21,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-11-21 19:45:21,719 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) [2023-11-21 19:45:21,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2023-11-21 19:45:21,721 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 27 [2023-11-21 19:45:21,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:21,722 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2023-11-21 19:45:21,723 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) [2023-11-21 19:45:21,723 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2023-11-21 19:45:21,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-21 19:45:21,726 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:21,727 INFO L195 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:21,756 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:21,945 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:21,945 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:21,945 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:21,946 INFO L85 PathProgramCache]: Analyzing trace with hash -1269749436, now seen corresponding path program 4 times [2023-11-21 19:45:21,946 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:21,946 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1835466073] [2023-11-21 19:45:21,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:21,946 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:21,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:22,089 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-21 19:45:22,089 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:22,091 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1835466073] [2023-11-21 19:45:22,091 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1835466073] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:22,091 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [739602645] [2023-11-21 19:45:22,091 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-21 19:45:22,092 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:22,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:22,096 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:22,119 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 19:45:22,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:22,163 INFO L262 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-21 19:45:22,165 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:22,227 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-21 19:45:22,227 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:23,206 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-21 19:45:23,207 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [739602645] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:23,208 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1136305865] [2023-11-21 19:45:23,213 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-21 19:45:23,214 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:23,214 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-21 19:45:23,216 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:23,216 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 13] total 15 [2023-11-21 19:45:23,216 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848273424] [2023-11-21 19:45:23,216 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:23,219 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-21 19:45:23,219 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:23,221 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-21 19:45:23,221 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2023-11-21 19:45:23,222 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) [2023-11-21 19:45:23,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:23,343 INFO L93 Difference]: Finished difference Result 30 states and 31 transitions. [2023-11-21 19:45:23,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-21 19:45:23,348 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 [2023-11-21 19:45:23,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:23,350 INFO L225 Difference]: With dead ends: 30 [2023-11-21 19:45:23,350 INFO L226 Difference]: Without dead ends: 26 [2023-11-21 19:45:23,351 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 [2023-11-21 19:45:23,352 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 [2023-11-21 19:45:23,352 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] [2023-11-21 19:45:23,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-21 19:45:23,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-11-21 19:45:23,360 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) [2023-11-21 19:45:23,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2023-11-21 19:45:23,361 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 33 [2023-11-21 19:45:23,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:23,362 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2023-11-21 19:45:23,362 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) [2023-11-21 19:45:23,363 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2023-11-21 19:45:23,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2023-11-21 19:45:23,364 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:23,364 INFO L195 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:23,384 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:23,571 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:23,572 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:23,572 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:23,572 INFO L85 PathProgramCache]: Analyzing trace with hash -4035634, now seen corresponding path program 5 times [2023-11-21 19:45:23,572 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:23,572 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369250587] [2023-11-21 19:45:23,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:23,573 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:23,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:23,777 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-11-21 19:45:23,777 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:23,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369250587] [2023-11-21 19:45:23,778 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1369250587] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:23,778 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101671939] [2023-11-21 19:45:23,778 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:45:23,778 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:23,778 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:23,779 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:23,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-21 19:45:23,877 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-11-21 19:45:23,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:45:23,878 INFO L262 TraceCheckSpWp]: Trace formula consists of 137 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-21 19:45:23,883 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:23,945 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2023-11-21 19:45:23,945 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:25,431 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 65 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-21 19:45:25,432 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1101671939] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:25,432 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1658414256] [2023-11-21 19:45:25,438 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-21 19:45:25,439 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:25,439 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-21 19:45:25,439 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:25,440 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 15] total 17 [2023-11-21 19:45:25,440 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855738789] [2023-11-21 19:45:25,440 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:25,441 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-21 19:45:25,441 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:25,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-21 19:45:25,442 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2023-11-21 19:45:25,443 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) [2023-11-21 19:45:25,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:25,592 INFO L93 Difference]: Finished difference Result 33 states and 34 transitions. [2023-11-21 19:45:25,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-21 19:45:25,593 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 [2023-11-21 19:45:25,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:25,594 INFO L225 Difference]: With dead ends: 33 [2023-11-21 19:45:25,595 INFO L226 Difference]: Without dead ends: 29 [2023-11-21 19:45:25,595 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 [2023-11-21 19:45:25,596 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 [2023-11-21 19:45:25,597 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] [2023-11-21 19:45:25,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-11-21 19:45:25,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2023-11-21 19:45:25,607 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) [2023-11-21 19:45:25,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2023-11-21 19:45:25,609 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 39 [2023-11-21 19:45:25,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:25,612 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2023-11-21 19:45:25,612 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) [2023-11-21 19:45:25,612 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2023-11-21 19:45:25,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-11-21 19:45:25,616 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:25,616 INFO L195 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:25,646 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:25,837 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:25,837 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:25,837 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:25,838 INFO L85 PathProgramCache]: Analyzing trace with hash -1047611388, now seen corresponding path program 6 times [2023-11-21 19:45:25,838 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:25,838 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952462593] [2023-11-21 19:45:25,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:25,838 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:25,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:26,154 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-11-21 19:45:26,154 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:26,155 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952462593] [2023-11-21 19:45:26,155 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1952462593] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:26,155 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1984152552] [2023-11-21 19:45:26,155 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-21 19:45:26,155 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:26,156 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:26,157 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:26,161 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-21 19:45:26,273 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-21 19:45:26,274 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:45:26,275 INFO L262 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-21 19:45:26,281 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:26,348 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-11-21 19:45:26,348 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:28,546 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-21 19:45:28,546 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1984152552] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:28,546 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1315804839] [2023-11-21 19:45:28,549 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-21 19:45:28,549 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:28,550 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-21 19:45:28,551 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:28,551 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 17] total 19 [2023-11-21 19:45:28,552 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653940214] [2023-11-21 19:45:28,552 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:28,552 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-11-21 19:45:28,553 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:28,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-11-21 19:45:28,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2023-11-21 19:45:28,554 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) [2023-11-21 19:45:28,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:28,728 INFO L93 Difference]: Finished difference Result 36 states and 37 transitions. [2023-11-21 19:45:28,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-21 19:45:28,729 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 [2023-11-21 19:45:28,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:28,730 INFO L225 Difference]: With dead ends: 36 [2023-11-21 19:45:28,731 INFO L226 Difference]: Without dead ends: 32 [2023-11-21 19:45:28,731 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 [2023-11-21 19:45:28,732 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 [2023-11-21 19:45:28,732 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] [2023-11-21 19:45:28,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-11-21 19:45:28,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2023-11-21 19:45:28,737 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) [2023-11-21 19:45:28,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2023-11-21 19:45:28,738 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 45 [2023-11-21 19:45:28,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:28,739 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2023-11-21 19:45:28,739 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) [2023-11-21 19:45:28,739 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2023-11-21 19:45:28,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-11-21 19:45:28,740 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:28,740 INFO L195 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:28,767 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:28,959 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:28,959 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:28,960 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:28,960 INFO L85 PathProgramCache]: Analyzing trace with hash 1466649358, now seen corresponding path program 7 times [2023-11-21 19:45:28,960 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:28,960 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [604376811] [2023-11-21 19:45:28,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:28,960 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:28,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:29,208 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2023-11-21 19:45:29,208 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:29,208 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [604376811] [2023-11-21 19:45:29,208 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [604376811] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:29,208 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [334020870] [2023-11-21 19:45:29,208 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-21 19:45:29,208 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:29,209 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:29,209 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:29,227 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-21 19:45:29,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:29,323 INFO L262 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 18 conjunts are in the unsatisfiable core [2023-11-21 19:45:29,331 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:29,392 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2023-11-21 19:45:29,392 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:32,050 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2023-11-21 19:45:32,051 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [334020870] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:32,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [585793227] [2023-11-21 19:45:32,056 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-21 19:45:32,056 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:32,056 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-21 19:45:32,057 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:32,058 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 19] total 21 [2023-11-21 19:45:32,058 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [482467521] [2023-11-21 19:45:32,058 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:32,059 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-21 19:45:32,059 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:32,060 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-21 19:45:32,061 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2023-11-21 19:45:32,061 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) [2023-11-21 19:45:32,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:32,193 INFO L93 Difference]: Finished difference Result 39 states and 40 transitions. [2023-11-21 19:45:32,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-21 19:45:32,194 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 [2023-11-21 19:45:32,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:32,196 INFO L225 Difference]: With dead ends: 39 [2023-11-21 19:45:32,197 INFO L226 Difference]: Without dead ends: 35 [2023-11-21 19:45:32,198 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 [2023-11-21 19:45:32,200 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 21 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s 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, 0.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:45:32,200 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 51 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-21 19:45:32,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-11-21 19:45:32,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2023-11-21 19:45:32,211 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) [2023-11-21 19:45:32,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2023-11-21 19:45:32,213 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 51 [2023-11-21 19:45:32,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:32,215 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2023-11-21 19:45:32,216 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) [2023-11-21 19:45:32,216 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2023-11-21 19:45:32,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-11-21 19:45:32,220 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:32,220 INFO L195 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:32,248 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:32,441 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:32,442 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:32,442 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:32,442 INFO L85 PathProgramCache]: Analyzing trace with hash 335541956, now seen corresponding path program 8 times [2023-11-21 19:45:32,442 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:32,442 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [491394629] [2023-11-21 19:45:32,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:32,443 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:32,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:32,704 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2023-11-21 19:45:32,704 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:32,704 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [491394629] [2023-11-21 19:45:32,705 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [491394629] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:32,705 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [669410013] [2023-11-21 19:45:32,705 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:45:32,705 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:32,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:32,706 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:32,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-21 19:45:32,880 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2023-11-21 19:45:32,880 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:45:32,881 INFO L262 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 20 conjunts are in the unsatisfiable core [2023-11-21 19:45:32,888 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:32,968 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2023-11-21 19:45:32,968 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:36,635 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 164 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-21 19:45:36,636 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [669410013] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:36,636 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1934269229] [2023-11-21 19:45:36,638 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-21 19:45:36,638 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:36,638 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-21 19:45:36,639 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:36,639 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 21] total 23 [2023-11-21 19:45:36,639 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2135410035] [2023-11-21 19:45:36,639 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:36,640 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-11-21 19:45:36,640 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:36,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-11-21 19:45:36,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2023-11-21 19:45:36,642 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) [2023-11-21 19:45:36,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:36,812 INFO L93 Difference]: Finished difference Result 42 states and 43 transitions. [2023-11-21 19:45:36,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-21 19:45:36,813 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 [2023-11-21 19:45:36,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:36,814 INFO L225 Difference]: With dead ends: 42 [2023-11-21 19:45:36,814 INFO L226 Difference]: Without dead ends: 38 [2023-11-21 19:45:36,820 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 [2023-11-21 19:45:36,823 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 [2023-11-21 19:45:36,824 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] [2023-11-21 19:45:36,825 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2023-11-21 19:45:36,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2023-11-21 19:45:36,838 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) [2023-11-21 19:45:36,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2023-11-21 19:45:36,842 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 57 [2023-11-21 19:45:36,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:36,842 INFO L495 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2023-11-21 19:45:36,843 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) [2023-11-21 19:45:36,843 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2023-11-21 19:45:36,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-11-21 19:45:36,846 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:36,847 INFO L195 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:36,871 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-11-21 19:45:37,067 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:37,067 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:37,067 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:37,068 INFO L85 PathProgramCache]: Analyzing trace with hash -682001842, now seen corresponding path program 9 times [2023-11-21 19:45:37,068 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:37,068 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1050930427] [2023-11-21 19:45:37,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:37,068 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:37,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:37,341 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2023-11-21 19:45:37,341 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:37,341 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1050930427] [2023-11-21 19:45:37,342 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1050930427] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:37,342 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1233741919] [2023-11-21 19:45:37,342 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-21 19:45:37,342 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:37,343 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:37,348 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:37,367 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-21 19:45:37,542 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-21 19:45:37,542 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:45:37,543 INFO L262 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-21 19:45:37,545 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:37,626 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2023-11-21 19:45:37,626 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:42,565 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 207 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-21 19:45:42,565 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1233741919] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:42,565 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2014077228] [2023-11-21 19:45:42,567 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-21 19:45:42,567 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:42,568 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-21 19:45:42,568 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:42,568 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 23] total 24 [2023-11-21 19:45:42,568 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2132234980] [2023-11-21 19:45:42,568 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:42,569 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-21 19:45:42,569 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:42,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-21 19:45:42,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=397, Unknown=0, NotChecked=0, Total=552 [2023-11-21 19:45:42,571 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) [2023-11-21 19:45:42,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:42,780 INFO L93 Difference]: Finished difference Result 45 states and 46 transitions. [2023-11-21 19:45:42,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-21 19:45:42,791 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 [2023-11-21 19:45:42,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:42,798 INFO L225 Difference]: With dead ends: 45 [2023-11-21 19:45:42,798 INFO L226 Difference]: Without dead ends: 41 [2023-11-21 19:45:42,799 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 [2023-11-21 19:45:42,800 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 [2023-11-21 19:45:42,800 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] [2023-11-21 19:45:42,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-11-21 19:45:42,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-11-21 19:45:42,805 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) [2023-11-21 19:45:42,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2023-11-21 19:45:42,806 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 63 [2023-11-21 19:45:42,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:42,806 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2023-11-21 19:45:42,807 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) [2023-11-21 19:45:42,807 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2023-11-21 19:45:42,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2023-11-21 19:45:42,808 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:45:42,808 INFO L195 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:45:42,830 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:43,019 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-21 19:45:43,019 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:45:43,020 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:45:43,020 INFO L85 PathProgramCache]: Analyzing trace with hash 1904272772, now seen corresponding path program 10 times [2023-11-21 19:45:43,020 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:45:43,020 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1128949033] [2023-11-21 19:45:43,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:45:43,020 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:45:43,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:44,294 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 135 proven. 39 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2023-11-21 19:45:44,294 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:45:44,295 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1128949033] [2023-11-21 19:45:44,295 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1128949033] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:45:44,295 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2134563227] [2023-11-21 19:45:44,295 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-21 19:45:44,295 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:44,295 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:45:44,300 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:45:44,315 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-21 19:45:44,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:45:44,559 INFO L262 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 97 conjunts are in the unsatisfiable core [2023-11-21 19:45:44,562 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:45:45,652 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 19 proven. 155 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2023-11-21 19:45:45,652 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:45:49,487 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 174 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2023-11-21 19:45:49,488 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2134563227] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:45:49,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1696613206] [2023-11-21 19:45:49,492 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-21 19:45:49,492 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:45:49,493 FATAL L? ?]: Ignoring exception! java.lang.IllegalArgumentException: Recursive programs are not supported. at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.topsortRelevant(CallGraph.java:132) at de.uni_freiburg.informatik.ultimate.lib.sifa.CallGraph.(CallGraph.java:97) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.(IcfgInterpreter.java:92) at de.uni_freiburg.informatik.ultimate.plugins.sifa.SifaBuilder.construct(SifaBuilder.java:96) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:98) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:68) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:101) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:77) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:148) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:137) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:85) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:82) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:337) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:431) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:366) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:415) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:302) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:262) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:175) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:154) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:167) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:150) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:127) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:233) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:227) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:144) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:106) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:319) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2023-11-21 19:45:49,494 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:45:49,494 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 59 [2023-11-21 19:45:49,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328544194] [2023-11-21 19:45:49,495 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:45:49,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2023-11-21 19:45:49,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:45:49,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2023-11-21 19:45:49,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=219, Invalid=3203, Unknown=0, NotChecked=0, Total=3422 [2023-11-21 19:45:49,501 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) [2023-11-21 19:45:51,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:45:51,090 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2023-11-21 19:45:51,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-11-21 19:45:51,091 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 [2023-11-21 19:45:51,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:45:51,092 INFO L225 Difference]: With dead ends: 44 [2023-11-21 19:45:51,092 INFO L226 Difference]: Without dead ends: 0 [2023-11-21 19:45:51,095 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 117 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1398 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=664, Invalid=6308, Unknown=0, NotChecked=0, Total=6972 [2023-11-21 19:45:51,096 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 [2023-11-21 19:45:51,096 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] [2023-11-21 19:45:51,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2023-11-21 19:45:51,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2023-11-21 19:45:51,097 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) [2023-11-21 19:45:51,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2023-11-21 19:45:51,097 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 69 [2023-11-21 19:45:51,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:45:51,098 INFO L495 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2023-11-21 19:45:51,098 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) [2023-11-21 19:45:51,098 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2023-11-21 19:45:51,098 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2023-11-21 19:45:51,100 INFO L805 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-11-21 19:45:51,122 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-21 19:45:51,322 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:45:51,324 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2023-11-21 19:45:51,350 INFO L899 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2023-11-21 19:45:51,350 INFO L899 garLoopResultBuilder]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 18) no Hoare annotation was computed. [2023-11-21 19:45:51,351 INFO L899 garLoopResultBuilder]: For program point L18(line 18) no Hoare annotation was computed. [2023-11-21 19:45:51,351 INFO L899 garLoopResultBuilder]: For program point L17(lines 17 19) no Hoare annotation was computed. [2023-11-21 19:45:51,352 INFO L895 garLoopResultBuilder]: At program point L16(line 16) the Hoare annotation is: (= |ULTIMATE.start_main_~a~0#1| 10) [2023-11-21 19:45:51,352 INFO L899 garLoopResultBuilder]: For program point L16-1(line 16) no Hoare annotation was computed. [2023-11-21 19:45:51,353 INFO L899 garLoopResultBuilder]: For program point L13(lines 13 20) no Hoare annotation was computed. [2023-11-21 19:45:51,353 INFO L899 garLoopResultBuilder]: For program point $Ultimate##0(line -1) no Hoare annotation was computed. [2023-11-21 19:45:51,353 INFO L899 garLoopResultBuilder]: For program point sumEXIT(lines 5 11) no Hoare annotation was computed. [2023-11-21 19:45:51,353 INFO L902 garLoopResultBuilder]: At program point $Ultimate##0(lines 5 11) the Hoare annotation is: true [2023-11-21 19:45:51,354 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|))) [2023-11-21 19:45:51,354 INFO L899 garLoopResultBuilder]: For program point L9-1(line 9) no Hoare annotation was computed. [2023-11-21 19:45:51,354 INFO L899 garLoopResultBuilder]: For program point L6(lines 6 10) no Hoare annotation was computed. [2023-11-21 19:45:51,355 INFO L899 garLoopResultBuilder]: For program point sumFINAL(lines 5 11) no Hoare annotation was computed. [2023-11-21 19:45:51,358 INFO L445 BasicCegarLoop]: Path program histogram: [10, 1] [2023-11-21 19:45:51,361 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2023-11-21 19:45:51,366 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.11 07:45:51 BoogieIcfgContainer [2023-11-21 19:45:51,367 INFO L131 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2023-11-21 19:45:51,367 INFO L112 PluginConnector]: ------------------------Witness Printer---------------------------- [2023-11-21 19:45:51,368 INFO L270 PluginConnector]: Initializing Witness Printer... [2023-11-21 19:45:51,368 INFO L274 PluginConnector]: Witness Printer initialized [2023-11-21 19:45:51,368 INFO L184 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:45:17" (3/4) ... [2023-11-21 19:45:51,370 INFO L137 WitnessPrinter]: Generating witness for correct program [2023-11-21 19:45:51,376 INFO L361 RCFGBacktranslator]: Ignoring RootEdge to procedure sum [2023-11-21 19:45:51,382 INFO L943 BoogieBacktranslator]: Reduced CFG by removing 13 nodes and edges [2023-11-21 19:45:51,382 INFO L943 BoogieBacktranslator]: Reduced CFG by removing 5 nodes and edges [2023-11-21 19:45:51,383 INFO L943 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2023-11-21 19:45:51,383 INFO L943 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2023-11-21 19:45:51,484 INFO L149 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/witness.graphml [2023-11-21 19:45:51,485 INFO L149 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/witness.yml [2023-11-21 19:45:51,485 INFO L131 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2023-11-21 19:45:51,485 INFO L158 Benchmark]: Toolchain (without parser) took 34311.44ms. Allocated memory was 130.0MB in the beginning and 327.2MB in the end (delta: 197.1MB). Free memory was 88.0MB in the beginning and 259.6MB in the end (delta: -171.6MB). Peak memory consumption was 26.3MB. Max. memory is 16.1GB. [2023-11-21 19:45:51,486 INFO L158 Benchmark]: CDTParser took 0.25ms. Allocated memory is still 130.0MB. Free memory is still 77.1MB. There was no memory consumed. Max. memory is 16.1GB. [2023-11-21 19:45:51,486 INFO L158 Benchmark]: CACSL2BoogieTranslator took 273.74ms. Allocated memory is still 130.0MB. Free memory was 87.6MB in the beginning and 77.5MB in the end (delta: 10.1MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. [2023-11-21 19:45:51,486 INFO L158 Benchmark]: Boogie Procedure Inliner took 40.22ms. Allocated memory is still 130.0MB. Free memory was 77.5MB in the beginning and 76.2MB in the end (delta: 1.3MB). There was no memory consumed. Max. memory is 16.1GB. [2023-11-21 19:45:51,487 INFO L158 Benchmark]: Boogie Preprocessor took 30.38ms. Allocated memory is still 130.0MB. Free memory was 76.2MB in the beginning and 75.0MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-11-21 19:45:51,487 INFO L158 Benchmark]: RCFGBuilder took 272.10ms. Allocated memory is still 130.0MB. Free memory was 75.0MB in the beginning and 65.8MB in the end (delta: 9.2MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. [2023-11-21 19:45:51,488 INFO L158 Benchmark]: TraceAbstraction took 33568.39ms. Allocated memory was 130.0MB in the beginning and 327.2MB in the end (delta: 197.1MB). Free memory was 64.9MB in the beginning and 263.8MB in the end (delta: -198.9MB). There was no memory consumed. Max. memory is 16.1GB. [2023-11-21 19:45:51,488 INFO L158 Benchmark]: Witness Printer took 117.54ms. Allocated memory is still 327.2MB. Free memory was 263.8MB in the beginning and 259.6MB in the end (delta: 4.2MB). Peak memory consumption was 4.2MB. Max. memory is 16.1GB. [2023-11-21 19:45:51,490 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25ms. Allocated memory is still 130.0MB. Free memory is still 77.1MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 273.74ms. Allocated memory is still 130.0MB. Free memory was 87.6MB in the beginning and 77.5MB in the end (delta: 10.1MB). Peak memory consumption was 10.5MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 40.22ms. Allocated memory is still 130.0MB. Free memory was 77.5MB in the beginning and 76.2MB in the end (delta: 1.3MB). There was no memory consumed. Max. memory is 16.1GB. * Boogie Preprocessor took 30.38ms. Allocated memory is still 130.0MB. Free memory was 76.2MB in the beginning and 75.0MB in the end (delta: 1.3MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 272.10ms. Allocated memory is still 130.0MB. Free memory was 75.0MB in the beginning and 65.8MB in the end (delta: 9.2MB). Peak memory consumption was 8.4MB. Max. memory is 16.1GB. * TraceAbstraction took 33568.39ms. Allocated memory was 130.0MB in the beginning and 327.2MB in the end (delta: 197.1MB). Free memory was 64.9MB in the beginning and 263.8MB in the end (delta: -198.9MB). There was no memory consumed. Max. memory is 16.1GB. * Witness Printer took 117.54ms. Allocated memory is still 327.2MB. Free memory was 263.8MB in the beginning and 259.6MB 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: 33.5s, OverallIterations: 11, TraceHistogramMax: 11, PathProgramHistogramMax: 10, EmptinessCheckTime: 0.0s, AutomataDifference: 3.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 519 SdHoareTripleChecker+Valid, 1.2s 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, 4.8s 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, 26.1s 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! [2023-11-21 19:45:51,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a1898e71-2944-4224-9a21-fef792701287/bin/utaipan-verify-QoSU8krkJ5/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