./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4fc63b2a Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2 --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash a8791b6973aa1a0d5421161a634fa2e6c3276aa5fd05ed6d81de7a2762aa206a --- Real Ultimate output --- This is Ultimate 0.2.5-dev-4fc63b2 [2024-11-02 11:25:17,595 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-02 11:25:17,694 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-02 11:25:17,701 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-02 11:25:17,704 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-02 11:25:17,745 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-02 11:25:17,746 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-02 11:25:17,747 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-02 11:25:17,748 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-02 11:25:17,750 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-02 11:25:17,751 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-02 11:25:17,752 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-02 11:25:17,753 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-02 11:25:17,753 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-02 11:25:17,753 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-02 11:25:17,754 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-02 11:25:17,758 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-02 11:25:17,758 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-02 11:25:17,759 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-02 11:25:17,759 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-02 11:25:17,759 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-02 11:25:17,764 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-02 11:25:17,765 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-02 11:25:17,765 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-02 11:25:17,765 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-02 11:25:17,765 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-02 11:25:17,766 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-02 11:25:17,766 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-02 11:25:17,766 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-02 11:25:17,766 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-02 11:25:17,767 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-02 11:25:17,767 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-02 11:25:17,768 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-02 11:25:17,768 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-02 11:25:17,769 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-02 11:25:17,770 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-02 11:25:17,770 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-02 11:25:17,771 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-02 11:25:17,772 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-02 11:25:17,772 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-02 11:25:17,772 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-02 11:25:17,773 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-02 11:25:17,773 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-02 11:25:17,773 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-02 11:25:17,774 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-02 11:25:17,774 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-02 11:25:17,774 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-02 11:25:17,775 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_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a8791b6973aa1a0d5421161a634fa2e6c3276aa5fd05ed6d81de7a2762aa206a [2024-11-02 11:25:18,098 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-02 11:25:18,125 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-02 11:25:18,127 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-02 11:25:18,131 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-02 11:25:18,132 INFO L274 PluginConnector]: CDTParser initialized [2024-11-02 11:25:18,133 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/../../sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c Unable to find full path for "g++" [2024-11-02 11:25:20,174 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-02 11:25:20,410 INFO L384 CDTParser]: Found 1 translation units. [2024-11-02 11:25:20,411 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c [2024-11-02 11:25:20,420 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/data/2dcfe0b5b/1ac3a9836d14471bbd4b22207b37e1e2/FLAG7ef4ba58f [2024-11-02 11:25:20,440 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/data/2dcfe0b5b/1ac3a9836d14471bbd4b22207b37e1e2 [2024-11-02 11:25:20,444 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-02 11:25:20,445 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-02 11:25:20,447 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-02 11:25:20,447 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-02 11:25:20,453 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-02 11:25:20,456 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 11:25:20" (1/1) ... [2024-11-02 11:25:20,457 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@47525771 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:20, skipping insertion in model container [2024-11-02 11:25:20,457 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 11:25:20" (1/1) ... [2024-11-02 11:25:20,485 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-02 11:25:20,688 WARN L251 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c[468,481] [2024-11-02 11:25:20,708 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-02 11:25:20,719 INFO L200 MainTranslator]: Completed pre-run [2024-11-02 11:25:20,733 WARN L251 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/sv-benchmarks/c/loops-crafted-1/nested_delay_notd2.c[468,481] [2024-11-02 11:25:20,739 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-02 11:25:20,761 INFO L204 MainTranslator]: Completed translation [2024-11-02 11:25:20,762 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:20 WrapperNode [2024-11-02 11:25:20,762 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-02 11:25:20,763 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-02 11:25:20,764 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-02 11:25:20,764 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-02 11:25:20,773 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:20" (1/1) ... [2024-11-02 11:25:20,782 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:20" (1/1) ... [2024-11-02 11:25:20,803 INFO L138 Inliner]: procedures = 14, calls = 9, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 62 [2024-11-02 11:25:20,804 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-02 11:25:20,805 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-02 11:25:20,805 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-02 11:25:20,805 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-02 11:25:20,814 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:20" (1/1) ... [2024-11-02 11:25:20,814 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:20" (1/1) ... [2024-11-02 11:25:20,816 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:20" (1/1) ... [2024-11-02 11:25:20,816 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:20" (1/1) ... [2024-11-02 11:25:20,819 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:20" (1/1) ... [2024-11-02 11:25:20,827 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:20" (1/1) ... [2024-11-02 11:25:20,828 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:20" (1/1) ... [2024-11-02 11:25:20,829 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:20" (1/1) ... [2024-11-02 11:25:20,831 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-02 11:25:20,832 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-02 11:25:20,832 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-02 11:25:20,832 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-02 11:25:20,833 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:20" (1/1) ... [2024-11-02 11:25:20,843 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-02 11:25:20,859 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:25:20,871 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-02 11:25:20,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-02 11:25:20,901 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-02 11:25:20,902 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-02 11:25:20,902 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-02 11:25:20,902 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-02 11:25:20,970 INFO L238 CfgBuilder]: Building ICFG [2024-11-02 11:25:20,973 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-02 11:25:21,146 INFO L? ?]: Removed 13 outVars from TransFormulas that were not future-live. [2024-11-02 11:25:21,146 INFO L287 CfgBuilder]: Performing block encoding [2024-11-02 11:25:21,278 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-02 11:25:21,278 INFO L316 CfgBuilder]: Removed 2 assume(true) statements. [2024-11-02 11:25:21,279 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 11:25:21 BoogieIcfgContainer [2024-11-02 11:25:21,279 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-02 11:25:21,282 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-02 11:25:21,282 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-02 11:25:21,286 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-02 11:25:21,286 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 11:25:20" (1/3) ... [2024-11-02 11:25:21,287 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ad7267a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 11:25:21, skipping insertion in model container [2024-11-02 11:25:21,287 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 11:25:20" (2/3) ... [2024-11-02 11:25:21,288 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3ad7267a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 11:25:21, skipping insertion in model container [2024-11-02 11:25:21,288 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 11:25:21" (3/3) ... [2024-11-02 11:25:21,290 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_delay_notd2.c [2024-11-02 11:25:21,310 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-02 11:25:21,310 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-11-02 11:25:21,378 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-02 11:25:21,386 INFO L333 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@66a98127, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-02 11:25:21,386 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-02 11:25:21,391 INFO L276 IsEmpty]: Start isEmpty. Operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 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) [2024-11-02 11:25:21,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2024-11-02 11:25:21,397 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:25:21,398 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2024-11-02 11:25:21,398 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:25:21,403 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:25:21,403 INFO L85 PathProgramCache]: Analyzing trace with hash 110532394, now seen corresponding path program 1 times [2024-11-02 11:25:21,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:25:21,414 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1744603784] [2024-11-02 11:25:21,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:21,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:25:21,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:25:21,814 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:25:21,814 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:25:21,815 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1744603784] [2024-11-02 11:25:21,815 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1744603784] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 11:25:21,816 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 11:25:21,816 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-11-02 11:25:21,819 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2017346068] [2024-11-02 11:25:21,820 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 11:25:21,825 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-02 11:25:21,826 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:25:21,855 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-02 11:25:21,856 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2024-11-02 11:25:21,858 INFO L87 Difference]: Start difference. First operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 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) Second operand has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 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) [2024-11-02 11:25:21,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:25:21,892 INFO L93 Difference]: Finished difference Result 15 states and 21 transitions. [2024-11-02 11:25:21,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-02 11:25:21,895 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 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) Word has length 5 [2024-11-02 11:25:21,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:25:21,903 INFO L225 Difference]: With dead ends: 15 [2024-11-02 11:25:21,903 INFO L226 Difference]: Without dead ends: 8 [2024-11-02 11:25:21,906 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2024-11-02 11:25:21,910 INFO L432 NwaCegarLoop]: 5 mSDtfsCounter, 7 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-02 11:25:21,912 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 9 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-02 11:25:21,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2024-11-02 11:25:21,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2024-11-02 11:25:21,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 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) [2024-11-02 11:25:21,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2024-11-02 11:25:21,946 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 5 [2024-11-02 11:25:21,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:25:21,946 INFO L471 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2024-11-02 11:25:21,946 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.25) internal successors, (5), 3 states have internal predecessors, (5), 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) [2024-11-02 11:25:21,947 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2024-11-02 11:25:21,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2024-11-02 11:25:21,947 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:25:21,947 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2024-11-02 11:25:21,948 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-02 11:25:21,948 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:25:21,949 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:25:21,949 INFO L85 PathProgramCache]: Analyzing trace with hash -868517856, now seen corresponding path program 1 times [2024-11-02 11:25:21,949 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:25:21,949 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1727213821] [2024-11-02 11:25:21,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:21,950 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:25:21,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:25:22,122 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:25:22,122 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:25:22,122 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1727213821] [2024-11-02 11:25:22,123 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1727213821] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:25:22,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1094078501] [2024-11-02 11:25:22,123 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:22,123 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:22,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:25:22,126 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:25:22,128 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-02 11:25:22,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:25:22,200 INFO L255 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-02 11:25:22,205 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:25:22,299 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:25:22,299 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:25:22,366 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:25:22,367 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1094078501] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:25:22,367 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [769109373] [2024-11-02 11:25:22,399 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2024-11-02 11:25:22,399 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:25:22,403 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:25:22,413 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:25:22,415 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:25:22,982 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:25:23,647 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '88#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~last~0) (= ~SIZE~0 20) (<= ~last~0 2147483647) (exists ((|v_ULTIMATE.start_main_~st~0#1_58| Int) (|v_ULTIMATE.start_main_#t~post6#1_34| Int) (|v_ULTIMATE.start_main_~a~0#1_46| Int) (|v_ULTIMATE.start_main_~c~0#1_56| Int) (|v_ULTIMATE.start_main_~a~0#1_47| Int) (|v_ULTIMATE.start_main_~b~0#1_40| Int)) (and (or (and (= |v_ULTIMATE.start_main_~st~0#1_58| 0) (= |v_ULTIMATE.start_main_~b~0#1_40| 3) (= 3 |v_ULTIMATE.start_main_~a~0#1_47|) (= (+ ~last~0 1) |v_ULTIMATE.start_main_~c~0#1_56|)) (and (or (not (= |v_ULTIMATE.start_main_~st~0#1_58| 0)) (not (= (+ ~last~0 1) |v_ULTIMATE.start_main_~c~0#1_56|))) (= |v_ULTIMATE.start_main_~b~0#1_40| 2) (= 2 |v_ULTIMATE.start_main_~a~0#1_47|))) (or (not (= |v_ULTIMATE.start_main_~c~0#1_56| 20)) (not (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|))) (= |v_ULTIMATE.start_main_~b~0#1_40| |ULTIMATE.start_main_~b~0#1|) (<= |v_ULTIMATE.start_main_~st~0#1_58| 1) (or (and (= |v_ULTIMATE.start_main_~st~0#1_58| 0) (= (+ |v_ULTIMATE.start_main_~a~0#1_47| 1) |v_ULTIMATE.start_main_~a~0#1_46|) (= ~last~0 |v_ULTIMATE.start_main_~c~0#1_56|) (= |ULTIMATE.start_main_#t~post6#1| |v_ULTIMATE.start_main_#t~post6#1_34|) (= |ULTIMATE.start_main_~d~0#1| 0)) (and (or (not (= |v_ULTIMATE.start_main_~st~0#1_58| 0)) (not (= ~last~0 |v_ULTIMATE.start_main_~c~0#1_56|))) (or (and (= |ULTIMATE.start_main_~d~0#1| 1) (<= 20 ~last~0) (= |v_ULTIMATE.start_main_~st~0#1_58| 1)) (and (or (< ~last~0 20) (not (= |v_ULTIMATE.start_main_~st~0#1_58| 1))) (= |ULTIMATE.start_main_#t~post6#1| |v_ULTIMATE.start_main_#t~post6#1_34|) (= |ULTIMATE.start_main_~d~0#1| 0))) (= |v_ULTIMATE.start_main_~a~0#1_47| |v_ULTIMATE.start_main_~a~0#1_46|))) (<= 20 |v_ULTIMATE.start_main_~c~0#1_56|) (= |ULTIMATE.start_main_~a~0#1| |v_ULTIMATE.start_main_~a~0#1_46|))))' at error location [2024-11-02 11:25:23,647 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:25:23,648 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:25:23,648 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2024-11-02 11:25:23,649 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046609465] [2024-11-02 11:25:23,650 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:25:23,650 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2024-11-02 11:25:23,652 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:25:23,652 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2024-11-02 11:25:23,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=127, Unknown=0, NotChecked=0, Total=182 [2024-11-02 11:25:23,653 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 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) [2024-11-02 11:25:23,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:25:23,742 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2024-11-02 11:25:23,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2024-11-02 11:25:23,745 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 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) Word has length 6 [2024-11-02 11:25:23,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:25:23,745 INFO L225 Difference]: With dead ends: 18 [2024-11-02 11:25:23,745 INFO L226 Difference]: Without dead ends: 11 [2024-11-02 11:25:23,746 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=73, Invalid=167, Unknown=0, NotChecked=0, Total=240 [2024-11-02 11:25:23,747 INFO L432 NwaCegarLoop]: 5 mSDtfsCounter, 9 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-02 11:25:23,750 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 17 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-02 11:25:23,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2024-11-02 11:25:23,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2024-11-02 11:25:23,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 states have internal predecessors, (12), 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) [2024-11-02 11:25:23,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2024-11-02 11:25:23,758 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 6 [2024-11-02 11:25:23,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:25:23,758 INFO L471 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2024-11-02 11:25:23,758 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.3) internal successors, (13), 9 states have internal predecessors, (13), 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) [2024-11-02 11:25:23,759 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2024-11-02 11:25:23,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2024-11-02 11:25:23,761 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:25:23,761 INFO L215 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1] [2024-11-02 11:25:23,783 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-11-02 11:25:23,965 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2024-11-02 11:25:23,966 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:25:23,966 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:25:23,966 INFO L85 PathProgramCache]: Analyzing trace with hash -1186847574, now seen corresponding path program 2 times [2024-11-02 11:25:23,967 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:25:23,967 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1028102395] [2024-11-02 11:25:23,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:23,968 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:25:23,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:25:24,150 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:25:24,151 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:25:24,151 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1028102395] [2024-11-02 11:25:24,151 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1028102395] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:25:24,151 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [23497165] [2024-11-02 11:25:24,152 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-02 11:25:24,152 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:24,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:25:24,154 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:25:24,157 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-02 11:25:24,226 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2024-11-02 11:25:24,226 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-02 11:25:24,228 INFO L255 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjuncts are in the unsatisfiable core [2024-11-02 11:25:24,229 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:25:24,341 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:25:24,341 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:25:24,440 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:25:24,440 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [23497165] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:25:24,440 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [874320816] [2024-11-02 11:25:24,442 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2024-11-02 11:25:24,443 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:25:24,443 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:25:24,443 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:25:24,443 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:25:24,719 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:25:25,322 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '207#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~last~0) (= ~SIZE~0 20) (<= ~last~0 2147483647) (exists ((|v_ULTIMATE.start_main_~c~0#1_70| Int) (|v_ULTIMATE.start_main_#t~post6#1_36| Int) (|v_ULTIMATE.start_main_~a~0#1_46| Int) (|v_ULTIMATE.start_main_~a~0#1_47| Int) (|v_ULTIMATE.start_main_~b~0#1_40| Int) (|v_ULTIMATE.start_main_~st~0#1_67| Int)) (and (<= 20 |v_ULTIMATE.start_main_~c~0#1_70|) (or (and (= |v_ULTIMATE.start_main_~b~0#1_40| 2) (= 2 |v_ULTIMATE.start_main_~a~0#1_47|) (or (not (= (+ ~last~0 1) |v_ULTIMATE.start_main_~c~0#1_70|)) (not (= |v_ULTIMATE.start_main_~st~0#1_67| 0)))) (and (= |v_ULTIMATE.start_main_~b~0#1_40| 3) (= 3 |v_ULTIMATE.start_main_~a~0#1_47|) (= (+ ~last~0 1) |v_ULTIMATE.start_main_~c~0#1_70|) (= |v_ULTIMATE.start_main_~st~0#1_67| 0))) (or (and (or (not (= ~last~0 |v_ULTIMATE.start_main_~c~0#1_70|)) (not (= |v_ULTIMATE.start_main_~st~0#1_67| 0))) (or (and (= |ULTIMATE.start_main_~d~0#1| 1) (<= 20 ~last~0) (= |v_ULTIMATE.start_main_~st~0#1_67| 1)) (and (= |ULTIMATE.start_main_#t~post6#1| |v_ULTIMATE.start_main_#t~post6#1_36|) (= |ULTIMATE.start_main_~d~0#1| 0) (or (not (= |v_ULTIMATE.start_main_~st~0#1_67| 1)) (< ~last~0 20)))) (= |v_ULTIMATE.start_main_~a~0#1_47| |v_ULTIMATE.start_main_~a~0#1_46|)) (and (= (+ |v_ULTIMATE.start_main_~a~0#1_47| 1) |v_ULTIMATE.start_main_~a~0#1_46|) (= |ULTIMATE.start_main_#t~post6#1| |v_ULTIMATE.start_main_#t~post6#1_36|) (= |ULTIMATE.start_main_~d~0#1| 0) (= ~last~0 |v_ULTIMATE.start_main_~c~0#1_70|) (= |v_ULTIMATE.start_main_~st~0#1_67| 0))) (= |v_ULTIMATE.start_main_~b~0#1_40| |ULTIMATE.start_main_~b~0#1|) (<= |v_ULTIMATE.start_main_~st~0#1_67| 1) (= |ULTIMATE.start_main_~a~0#1| |v_ULTIMATE.start_main_~a~0#1_46|) (or (not (= |v_ULTIMATE.start_main_~c~0#1_70| 20)) (not (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|))))))' at error location [2024-11-02 11:25:25,322 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:25:25,322 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:25:25,323 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 18 [2024-11-02 11:25:25,323 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156031329] [2024-11-02 11:25:25,323 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:25:25,323 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2024-11-02 11:25:25,324 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:25:25,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2024-11-02 11:25:25,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=163, Invalid=343, Unknown=0, NotChecked=0, Total=506 [2024-11-02 11:25:25,325 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 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) [2024-11-02 11:25:25,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:25:25,497 INFO L93 Difference]: Finished difference Result 27 states and 35 transitions. [2024-11-02 11:25:25,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2024-11-02 11:25:25,498 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 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) Word has length 9 [2024-11-02 11:25:25,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:25:25,498 INFO L225 Difference]: With dead ends: 27 [2024-11-02 11:25:25,498 INFO L226 Difference]: Without dead ends: 17 [2024-11-02 11:25:25,499 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=238, Invalid=518, Unknown=0, NotChecked=0, Total=756 [2024-11-02 11:25:25,500 INFO L432 NwaCegarLoop]: 5 mSDtfsCounter, 24 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-02 11:25:25,501 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 25 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-02 11:25:25,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2024-11-02 11:25:25,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2024-11-02 11:25:25,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.125) internal successors, (18), 16 states have internal predecessors, (18), 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) [2024-11-02 11:25:25,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2024-11-02 11:25:25,505 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 9 [2024-11-02 11:25:25,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:25:25,505 INFO L471 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2024-11-02 11:25:25,506 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 18 states have internal predecessors, (22), 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) [2024-11-02 11:25:25,506 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2024-11-02 11:25:25,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2024-11-02 11:25:25,506 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:25:25,506 INFO L215 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1] [2024-11-02 11:25:25,530 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2024-11-02 11:25:25,711 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:25,711 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:25:25,712 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:25:25,712 INFO L85 PathProgramCache]: Analyzing trace with hash 2036093162, now seen corresponding path program 3 times [2024-11-02 11:25:25,712 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:25:25,714 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1718259727] [2024-11-02 11:25:25,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:25,715 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:25:25,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:25:26,119 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:25:26,120 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:25:26,120 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1718259727] [2024-11-02 11:25:26,120 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1718259727] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:25:26,121 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [588244520] [2024-11-02 11:25:26,121 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-02 11:25:26,121 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:26,121 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:25:26,124 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:25:26,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-02 11:25:26,197 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-02 11:25:26,197 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-02 11:25:26,198 INFO L255 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 13 conjuncts are in the unsatisfiable core [2024-11-02 11:25:26,200 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:25:26,448 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:25:26,448 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:25:26,770 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:25:26,771 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [588244520] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:25:26,771 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1549414860] [2024-11-02 11:25:26,773 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2024-11-02 11:25:26,773 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:25:26,773 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:25:26,774 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:25:26,775 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:25:26,997 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:25:27,629 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '414#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~last~0) (= ~SIZE~0 20) (exists ((|v_ULTIMATE.start_main_~st~0#1_82| Int) (|v_ULTIMATE.start_main_~a~0#1_46| Int) (|v_ULTIMATE.start_main_#t~post6#1_38| Int) (|v_ULTIMATE.start_main_~a~0#1_47| Int) (|v_ULTIMATE.start_main_~b~0#1_40| Int) (|v_ULTIMATE.start_main_~c~0#1_96| Int)) (and (or (and (= |ULTIMATE.start_main_#t~post6#1| |v_ULTIMATE.start_main_#t~post6#1_38|) (= (+ |v_ULTIMATE.start_main_~a~0#1_47| 1) |v_ULTIMATE.start_main_~a~0#1_46|) (= |v_ULTIMATE.start_main_~st~0#1_82| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= ~last~0 |v_ULTIMATE.start_main_~c~0#1_96|)) (and (or (and (= |ULTIMATE.start_main_~d~0#1| 1) (<= 20 ~last~0) (= |v_ULTIMATE.start_main_~st~0#1_82| 1)) (and (= |ULTIMATE.start_main_#t~post6#1| |v_ULTIMATE.start_main_#t~post6#1_38|) (or (not (= |v_ULTIMATE.start_main_~st~0#1_82| 1)) (< ~last~0 20)) (= |ULTIMATE.start_main_~d~0#1| 0))) (or (not (= ~last~0 |v_ULTIMATE.start_main_~c~0#1_96|)) (not (= |v_ULTIMATE.start_main_~st~0#1_82| 0))) (= |v_ULTIMATE.start_main_~a~0#1_47| |v_ULTIMATE.start_main_~a~0#1_46|))) (= |v_ULTIMATE.start_main_~b~0#1_40| |ULTIMATE.start_main_~b~0#1|) (or (and (or (not (= (+ ~last~0 1) |v_ULTIMATE.start_main_~c~0#1_96|)) (not (= |v_ULTIMATE.start_main_~st~0#1_82| 0))) (= |v_ULTIMATE.start_main_~b~0#1_40| 2) (= 2 |v_ULTIMATE.start_main_~a~0#1_47|)) (and (= (+ ~last~0 1) |v_ULTIMATE.start_main_~c~0#1_96|) (= |v_ULTIMATE.start_main_~b~0#1_40| 3) (= |v_ULTIMATE.start_main_~st~0#1_82| 0) (= 3 |v_ULTIMATE.start_main_~a~0#1_47|))) (= |ULTIMATE.start_main_~a~0#1| |v_ULTIMATE.start_main_~a~0#1_46|) (<= 20 |v_ULTIMATE.start_main_~c~0#1_96|) (or (not (= |v_ULTIMATE.start_main_~c~0#1_96| 20)) (not (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|))) (<= |v_ULTIMATE.start_main_~st~0#1_82| 1))) (<= ~last~0 2147483647))' at error location [2024-11-02 11:25:27,630 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:25:27,630 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:25:27,630 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 34 [2024-11-02 11:25:27,630 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1574625377] [2024-11-02 11:25:27,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:25:27,631 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2024-11-02 11:25:27,632 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:25:27,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2024-11-02 11:25:27,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=528, Invalid=954, Unknown=0, NotChecked=0, Total=1482 [2024-11-02 11:25:27,634 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand has 35 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 34 states have internal predecessors, (39), 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) [2024-11-02 11:25:28,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:25:28,015 INFO L93 Difference]: Finished difference Result 43 states and 55 transitions. [2024-11-02 11:25:28,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2024-11-02 11:25:28,017 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 34 states have internal predecessors, (39), 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) Word has length 15 [2024-11-02 11:25:28,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:25:28,018 INFO L225 Difference]: With dead ends: 43 [2024-11-02 11:25:28,018 INFO L226 Difference]: Without dead ends: 27 [2024-11-02 11:25:28,019 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 905 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=753, Invalid=1503, Unknown=0, NotChecked=0, Total=2256 [2024-11-02 11:25:28,023 INFO L432 NwaCegarLoop]: 5 mSDtfsCounter, 16 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 21 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 [2024-11-02 11:25:28,023 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [16 Valid, 21 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-02 11:25:28,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2024-11-02 11:25:28,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2024-11-02 11:25:28,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0769230769230769) internal successors, (28), 26 states have internal predecessors, (28), 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) [2024-11-02 11:25:28,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2024-11-02 11:25:28,034 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 15 [2024-11-02 11:25:28,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:25:28,034 INFO L471 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2024-11-02 11:25:28,036 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 34 states have internal predecessors, (39), 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) [2024-11-02 11:25:28,036 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2024-11-02 11:25:28,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2024-11-02 11:25:28,038 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:25:28,038 INFO L215 NwaCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1] [2024-11-02 11:25:28,061 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2024-11-02 11:25:28,238 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:28,239 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:25:28,240 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:25:28,242 INFO L85 PathProgramCache]: Analyzing trace with hash -359343446, now seen corresponding path program 4 times [2024-11-02 11:25:28,242 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:25:28,242 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351934545] [2024-11-02 11:25:28,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:28,243 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:25:28,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:25:31,484 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:25:31,485 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:25:31,486 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [351934545] [2024-11-02 11:25:31,488 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [351934545] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:25:31,488 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [465343563] [2024-11-02 11:25:31,488 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-02 11:25:31,489 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:31,489 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:25:31,491 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:25:31,493 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-02 11:25:31,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:25:31,576 WARN L253 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 77 conjuncts are in the unsatisfiable core [2024-11-02 11:25:31,582 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:25:34,923 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:25:34,924 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 11:25:40,943 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 11:25:40,944 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [465343563] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 11:25:40,944 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2066684004] [2024-11-02 11:25:40,946 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2024-11-02 11:25:40,946 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 11:25:40,946 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 11:25:40,946 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 11:25:40,947 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 11:25:41,099 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 11:25:41,858 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '776#(and (<= 1 |#StackHeapBarrier|) (<= 1 ~last~0) (exists ((|v_ULTIMATE.start_main_#t~post6#1_41| Int) (|v_ULTIMATE.start_main_~c~0#1_142| Int) (|v_ULTIMATE.start_main_~st~0#1_128| Int) (|v_ULTIMATE.start_main_~a~0#1_46| Int) (|v_ULTIMATE.start_main_~a~0#1_47| Int) (|v_ULTIMATE.start_main_~b~0#1_40| Int)) (and (or (and (or (and (= |ULTIMATE.start_main_~d~0#1| 1) (<= 20 ~last~0) (= |v_ULTIMATE.start_main_~st~0#1_128| 1)) (and (= |ULTIMATE.start_main_~d~0#1| 0) (or (not (= |v_ULTIMATE.start_main_~st~0#1_128| 1)) (< ~last~0 20)) (= |ULTIMATE.start_main_#t~post6#1| |v_ULTIMATE.start_main_#t~post6#1_41|))) (= |v_ULTIMATE.start_main_~a~0#1_47| |v_ULTIMATE.start_main_~a~0#1_46|) (or (not (= |v_ULTIMATE.start_main_~st~0#1_128| 0)) (not (= ~last~0 |v_ULTIMATE.start_main_~c~0#1_142|)))) (and (= (+ |v_ULTIMATE.start_main_~a~0#1_47| 1) |v_ULTIMATE.start_main_~a~0#1_46|) (= ~last~0 |v_ULTIMATE.start_main_~c~0#1_142|) (= |v_ULTIMATE.start_main_~st~0#1_128| 0) (= |ULTIMATE.start_main_~d~0#1| 0) (= |ULTIMATE.start_main_#t~post6#1| |v_ULTIMATE.start_main_#t~post6#1_41|))) (= |v_ULTIMATE.start_main_~b~0#1_40| |ULTIMATE.start_main_~b~0#1|) (<= 20 |v_ULTIMATE.start_main_~c~0#1_142|) (<= |v_ULTIMATE.start_main_~st~0#1_128| 1) (or (and (= |v_ULTIMATE.start_main_~b~0#1_40| 3) (= 3 |v_ULTIMATE.start_main_~a~0#1_47|) (= |v_ULTIMATE.start_main_~st~0#1_128| 0) (= |v_ULTIMATE.start_main_~c~0#1_142| (+ ~last~0 1))) (and (= |v_ULTIMATE.start_main_~b~0#1_40| 2) (= 2 |v_ULTIMATE.start_main_~a~0#1_47|) (or (not (= |v_ULTIMATE.start_main_~c~0#1_142| (+ ~last~0 1))) (not (= |v_ULTIMATE.start_main_~st~0#1_128| 0))))) (or (not (= |v_ULTIMATE.start_main_~c~0#1_142| 20)) (not (= |ULTIMATE.start_main_~a~0#1| |ULTIMATE.start_main_~b~0#1|))) (= |ULTIMATE.start_main_~a~0#1| |v_ULTIMATE.start_main_~a~0#1_46|))) (= ~SIZE~0 20) (<= ~last~0 2147483647))' at error location [2024-11-02 11:25:41,858 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 11:25:41,858 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 11:25:41,858 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 69 [2024-11-02 11:25:41,858 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20789913] [2024-11-02 11:25:41,858 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 11:25:41,859 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 70 states [2024-11-02 11:25:41,859 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:25:41,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2024-11-02 11:25:41,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1333, Invalid=4069, Unknown=0, NotChecked=0, Total=5402 [2024-11-02 11:25:41,863 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand has 70 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 69 states have internal predecessors, (72), 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) [2024-11-02 11:25:47,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:25:47,405 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2024-11-02 11:25:47,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2024-11-02 11:25:47,406 INFO L78 Accepts]: Start accepts. Automaton has has 70 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 69 states have internal predecessors, (72), 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) Word has length 25 [2024-11-02 11:25:47,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:25:47,407 INFO L225 Difference]: With dead ends: 78 [2024-11-02 11:25:47,407 INFO L226 Difference]: Without dead ends: 76 [2024-11-02 11:25:47,413 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4219 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=3483, Invalid=10089, Unknown=0, NotChecked=0, Total=13572 [2024-11-02 11:25:47,414 INFO L432 NwaCegarLoop]: 4 mSDtfsCounter, 47 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 106 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-02 11:25:47,414 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 34 Invalid, 106 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-02 11:25:47,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2024-11-02 11:25:47,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 74. [2024-11-02 11:25:47,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0547945205479452) internal successors, (77), 73 states have internal predecessors, (77), 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) [2024-11-02 11:25:47,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 77 transitions. [2024-11-02 11:25:47,438 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 77 transitions. Word has length 25 [2024-11-02 11:25:47,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:25:47,438 INFO L471 AbstractCegarLoop]: Abstraction has 74 states and 77 transitions. [2024-11-02 11:25:47,439 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 70 states, 70 states have (on average 1.0285714285714285) internal successors, (72), 69 states have internal predecessors, (72), 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) [2024-11-02 11:25:47,439 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 77 transitions. [2024-11-02 11:25:47,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2024-11-02 11:25:47,440 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:25:47,440 INFO L215 NwaCegarLoop]: trace histogram [41, 2, 2, 1, 1, 1, 1, 1] [2024-11-02 11:25:47,458 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2024-11-02 11:25:47,644 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:47,644 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:25:47,645 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:25:47,645 INFO L85 PathProgramCache]: Analyzing trace with hash 1689444428, now seen corresponding path program 1 times [2024-11-02 11:25:47,645 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:25:47,645 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1815137569] [2024-11-02 11:25:47,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:47,645 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:25:47,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:25:48,346 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 254 proven. 440 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2024-11-02 11:25:48,347 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 11:25:48,347 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1815137569] [2024-11-02 11:25:48,347 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1815137569] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 11:25:48,347 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [259618951] [2024-11-02 11:25:48,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:48,348 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 11:25:48,348 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 11:25:48,350 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 11:25:48,351 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-02 11:25:48,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 11:25:48,439 INFO L255 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 23 conjuncts are in the unsatisfiable core [2024-11-02 11:25:48,441 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 11:25:49,366 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 694 proven. 0 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2024-11-02 11:25:49,366 INFO L307 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2024-11-02 11:25:49,367 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [259618951] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 11:25:49,367 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2024-11-02 11:25:49,367 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [23] total 44 [2024-11-02 11:25:49,367 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560563573] [2024-11-02 11:25:49,367 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 11:25:49,368 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2024-11-02 11:25:49,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 11:25:49,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2024-11-02 11:25:49,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=720, Invalid=1260, Unknown=0, NotChecked=0, Total=1980 [2024-11-02 11:25:49,370 INFO L87 Difference]: Start difference. First operand 74 states and 77 transitions. Second operand has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 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) [2024-11-02 11:25:49,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 11:25:49,483 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2024-11-02 11:25:49,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2024-11-02 11:25:49,486 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 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) Word has length 50 [2024-11-02 11:25:49,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 11:25:49,488 INFO L225 Difference]: With dead ends: 126 [2024-11-02 11:25:49,488 INFO L226 Difference]: Without dead ends: 74 [2024-11-02 11:25:49,489 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=720, Invalid=1260, Unknown=0, NotChecked=0, Total=1980 [2024-11-02 11:25:49,492 INFO L432 NwaCegarLoop]: 5 mSDtfsCounter, 2 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 11:25:49,492 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 25 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 11:25:49,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2024-11-02 11:25:49,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2024-11-02 11:25:49,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0136986301369864) internal successors, (74), 73 states have internal predecessors, (74), 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) [2024-11-02 11:25:49,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 74 transitions. [2024-11-02 11:25:49,530 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 74 transitions. Word has length 50 [2024-11-02 11:25:49,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 11:25:49,530 INFO L471 AbstractCegarLoop]: Abstraction has 74 states and 74 transitions. [2024-11-02 11:25:49,530 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 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) [2024-11-02 11:25:49,530 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 74 transitions. [2024-11-02 11:25:49,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2024-11-02 11:25:49,532 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 11:25:49,532 INFO L215 NwaCegarLoop]: trace histogram [60, 3, 3, 2, 2, 1, 1, 1] [2024-11-02 11:25:49,556 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2024-11-02 11:25:49,733 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c90de34-d5c9-493c-9993-41cb9da97fcf/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2024-11-02 11:25:49,733 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 11:25:49,734 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 11:25:49,734 INFO L85 PathProgramCache]: Analyzing trace with hash -1335370670, now seen corresponding path program 2 times [2024-11-02 11:25:49,734 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 11:25:49,734 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1599756941] [2024-11-02 11:25:49,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 11:25:49,734 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 11:25:49,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat