./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/cohendiv-ll_valuebound20.c --full-output --architecture 32bit


--------------------------------------------------------------------------------


Checking for ERROR reachability
Using default analysis
Version 4fc63b2a
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_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/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_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/config/TaipanReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/cohendiv-ll_valuebound20.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/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_60081efd-4c37-4030-aaf4-67006b056d7a/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 014459ae7f9a4506b7655fe1f167856eb64829e3739070f7d1f854e4ecd5b5bc
--- Real Ultimate output ---
This is Ultimate 0.2.5-dev-4fc63b2
[2024-11-02 12:34:24,364 INFO  L188        SettingsManager]: Resetting all preferences to default values...
[2024-11-02 12:34:24,455 INFO  L114        SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-Reach-32bit-Taipan_Default.epf
[2024-11-02 12:34:24,460 WARN  L101        SettingsManager]: Preference file contains the following unknown settings:
[2024-11-02 12:34:24,460 WARN  L103        SettingsManager]:   * de.uni_freiburg.informatik.ultimate.core.Log level for class
[2024-11-02 12:34:24,490 INFO  L130        SettingsManager]: Preferences different from defaults after loading the file:
[2024-11-02 12:34:24,491 INFO  L151        SettingsManager]: Preferences of UltimateCore differ from their defaults:
[2024-11-02 12:34:24,491 INFO  L153        SettingsManager]:  * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR;
[2024-11-02 12:34:24,492 INFO  L151        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2024-11-02 12:34:24,492 INFO  L153        SettingsManager]:  * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS
[2024-11-02 12:34:24,493 INFO  L153        SettingsManager]:  * User list type=DISABLED
[2024-11-02 12:34:24,493 INFO  L151        SettingsManager]: Preferences of Abstract Interpretation differ from their defaults:
[2024-11-02 12:34:24,493 INFO  L153        SettingsManager]:  * Explicit value domain=true
[2024-11-02 12:34:24,494 INFO  L153        SettingsManager]:  * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain
[2024-11-02 12:34:24,494 INFO  L153        SettingsManager]:  * Octagon Domain=false
[2024-11-02 12:34:24,494 INFO  L153        SettingsManager]:  * Abstract domain=CompoundDomain
[2024-11-02 12:34:24,495 INFO  L153        SettingsManager]:  * Check feasibility of abstract posts with an SMT solver=true
[2024-11-02 12:34:24,501 INFO  L153        SettingsManager]:  * Use the RCFG-of-the-future interface=true
[2024-11-02 12:34:24,501 INFO  L153        SettingsManager]:  * Interval Domain=false
[2024-11-02 12:34:24,502 INFO  L151        SettingsManager]: Preferences of Sifa differ from their defaults:
[2024-11-02 12:34:24,502 INFO  L153        SettingsManager]:  * Call Summarizer=TopInputCallSummarizer
[2024-11-02 12:34:24,503 INFO  L153        SettingsManager]:  * Simplification Technique=POLY_PAC
[2024-11-02 12:34:24,503 INFO  L151        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2024-11-02 12:34:24,504 INFO  L153        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2024-11-02 12:34:24,506 INFO  L153        SettingsManager]:  * sizeof long=4
[2024-11-02 12:34:24,507 INFO  L153        SettingsManager]:  * Overapproximate operations on floating types=true
[2024-11-02 12:34:24,507 INFO  L153        SettingsManager]:  * sizeof POINTER=4
[2024-11-02 12:34:24,507 INFO  L153        SettingsManager]:  * Check division by zero=IGNORE
[2024-11-02 12:34:24,508 INFO  L153        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2024-11-02 12:34:24,508 INFO  L153        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2024-11-02 12:34:24,508 INFO  L153        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2024-11-02 12:34:24,508 INFO  L153        SettingsManager]:  * Allow undefined functions=false
[2024-11-02 12:34:24,508 INFO  L153        SettingsManager]:  * sizeof long double=12
[2024-11-02 12:34:24,509 INFO  L153        SettingsManager]:  * Check if freed pointer was valid=false
[2024-11-02 12:34:24,509 INFO  L153        SettingsManager]:  * Use constant arrays=true
[2024-11-02 12:34:24,509 INFO  L151        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2024-11-02 12:34:24,510 INFO  L153        SettingsManager]:  * Only consider context switches at boundaries of atomic blocks=true
[2024-11-02 12:34:24,510 INFO  L153        SettingsManager]:  * SMT solver=External_DefaultMode
[2024-11-02 12:34:24,511 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2024-11-02 12:34:24,511 INFO  L151        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2024-11-02 12:34:24,511 INFO  L153        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2024-11-02 12:34:24,512 INFO  L153        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopHeads
[2024-11-02 12:34:24,512 INFO  L153        SettingsManager]:  * Trace refinement strategy=SIFA_TAIPAN
[2024-11-02 12:34:24,512 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2024-11-02 12:34:24,513 INFO  L153        SettingsManager]:  * Apply one-shot large block encoding in concurrent analysis=false
[2024-11-02 12:34:24,513 INFO  L153        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2024-11-02 12:34:24,513 INFO  L153        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
[2024-11-02 12:34:24,513 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_60081efd-4c37-4030-aaf4-67006b056d7a/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_60081efd-4c37-4030-aaf4-67006b056d7a/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 -> 014459ae7f9a4506b7655fe1f167856eb64829e3739070f7d1f854e4ecd5b5bc
[2024-11-02 12:34:24,811 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2024-11-02 12:34:24,839 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2024-11-02 12:34:24,842 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2024-11-02 12:34:24,845 INFO  L270        PluginConnector]: Initializing CDTParser...
[2024-11-02 12:34:24,846 INFO  L274        PluginConnector]: CDTParser initialized
[2024-11-02 12:34:24,847 INFO  L431   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/../../sv-benchmarks/c/nla-digbench-scaling/cohendiv-ll_valuebound20.c
Unable to find full path for "g++"
[2024-11-02 12:34:26,916 INFO  L533              CDTParser]: Created temporary CDT project at NULL
[2024-11-02 12:34:27,173 INFO  L384              CDTParser]: Found 1 translation units.
[2024-11-02 12:34:27,174 INFO  L180              CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/sv-benchmarks/c/nla-digbench-scaling/cohendiv-ll_valuebound20.c
[2024-11-02 12:34:27,182 INFO  L427              CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/data/9f84e3b9f/7b616d23d73b4a8f8861e3aa1d80251e/FLAGc2c005294
[2024-11-02 12:34:27,204 INFO  L435              CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/data/9f84e3b9f/7b616d23d73b4a8f8861e3aa1d80251e
[2024-11-02 12:34:27,208 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2024-11-02 12:34:27,211 INFO  L133        ToolchainWalker]: Walking toolchain with 6 elements.
[2024-11-02 12:34:27,215 INFO  L112        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2024-11-02 12:34:27,215 INFO  L270        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2024-11-02 12:34:27,221 INFO  L274        PluginConnector]: CACSL2BoogieTranslator initialized
[2024-11-02 12:34:27,222 INFO  L184        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 12:34:27" (1/1) ...
[2024-11-02 12:34:27,223 INFO  L204        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@168800ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:34:27, skipping insertion in model container
[2024-11-02 12:34:27,223 INFO  L184        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 12:34:27" (1/1) ...
[2024-11-02 12:34:27,249 INFO  L175         MainTranslator]: Built tables and reachable declarations
[2024-11-02 12:34:27,445 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_60081efd-4c37-4030-aaf4-67006b056d7a/sv-benchmarks/c/nla-digbench-scaling/cohendiv-ll_valuebound20.c[576,589]
[2024-11-02 12:34:27,463 INFO  L210          PostProcessor]: Analyzing one entry point: main
[2024-11-02 12:34:27,472 INFO  L200         MainTranslator]: Completed pre-run
[2024-11-02 12:34:27,485 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_60081efd-4c37-4030-aaf4-67006b056d7a/sv-benchmarks/c/nla-digbench-scaling/cohendiv-ll_valuebound20.c[576,589]
[2024-11-02 12:34:27,491 INFO  L210          PostProcessor]: Analyzing one entry point: main
[2024-11-02 12:34:27,509 INFO  L204         MainTranslator]: Completed translation
[2024-11-02 12:34:27,510 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:34:27 WrapperNode
[2024-11-02 12:34:27,510 INFO  L131        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2024-11-02 12:34:27,511 INFO  L112        PluginConnector]: ------------------------Boogie Procedure Inliner----------------------------
[2024-11-02 12:34:27,511 INFO  L270        PluginConnector]: Initializing Boogie Procedure Inliner...
[2024-11-02 12:34:27,512 INFO  L274        PluginConnector]: Boogie Procedure Inliner initialized
[2024-11-02 12:34:27,520 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:34:27" (1/1) ...
[2024-11-02 12:34:27,526 INFO  L184        PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:34:27" (1/1) ...
[2024-11-02 12:34:27,548 INFO  L138                Inliner]: procedures = 14, calls = 17, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 57
[2024-11-02 12:34:27,550 INFO  L131        PluginConnector]: ------------------------ END Boogie Procedure Inliner----------------------------
[2024-11-02 12:34:27,551 INFO  L112        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2024-11-02 12:34:27,551 INFO  L270        PluginConnector]: Initializing Boogie Preprocessor...
[2024-11-02 12:34:27,551 INFO  L274        PluginConnector]: Boogie Preprocessor initialized
[2024-11-02 12:34:27,562 INFO  L184        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:34:27" (1/1) ...
[2024-11-02 12:34:27,562 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:34:27" (1/1) ...
[2024-11-02 12:34:27,567 INFO  L184        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:34:27" (1/1) ...
[2024-11-02 12:34:27,568 INFO  L184        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:34:27" (1/1) ...
[2024-11-02 12:34:27,571 INFO  L184        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:34:27" (1/1) ...
[2024-11-02 12:34:27,578 INFO  L184        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:34:27" (1/1) ...
[2024-11-02 12:34:27,582 INFO  L184        PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:34:27" (1/1) ...
[2024-11-02 12:34:27,583 INFO  L184        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:34:27" (1/1) ...
[2024-11-02 12:34:27,584 INFO  L131        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2024-11-02 12:34:27,589 INFO  L112        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2024-11-02 12:34:27,589 INFO  L270        PluginConnector]: Initializing RCFGBuilder...
[2024-11-02 12:34:27,589 INFO  L274        PluginConnector]: RCFGBuilder initialized
[2024-11-02 12:34:27,590 INFO  L184        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:34:27" (1/1) ...
[2024-11-02 12:34:27,598 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2024-11-02 12:34:27,610 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3
[2024-11-02 12:34:27,624 INFO  L229       MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
[2024-11-02 12:34:27,627 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process
[2024-11-02 12:34:27,661 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit
[2024-11-02 12:34:27,662 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2024-11-02 12:34:27,662 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2024-11-02 12:34:27,663 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int
[2024-11-02 12:34:27,664 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2024-11-02 12:34:27,664 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2024-11-02 12:34:27,664 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2024-11-02 12:34:27,664 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2024-11-02 12:34:27,738 INFO  L238             CfgBuilder]: Building ICFG
[2024-11-02 12:34:27,741 INFO  L264             CfgBuilder]: Building CFG for each procedure with an implementation
[2024-11-02 12:34:27,930 INFO  L?                        ?]: Removed 5 outVars from TransFormulas that were not future-live.
[2024-11-02 12:34:27,931 INFO  L287             CfgBuilder]: Performing block encoding
[2024-11-02 12:34:27,968 INFO  L311             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2024-11-02 12:34:27,969 INFO  L316             CfgBuilder]: Removed 2 assume(true) statements.
[2024-11-02 12:34:27,969 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 12:34:27 BoogieIcfgContainer
[2024-11-02 12:34:27,970 INFO  L131        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2024-11-02 12:34:27,973 INFO  L112        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2024-11-02 12:34:27,973 INFO  L270        PluginConnector]: Initializing TraceAbstraction...
[2024-11-02 12:34:27,977 INFO  L274        PluginConnector]: TraceAbstraction initialized
[2024-11-02 12:34:27,978 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 12:34:27" (1/3) ...
[2024-11-02 12:34:27,979 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b5de13b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 12:34:27, skipping insertion in model container
[2024-11-02 12:34:27,979 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:34:27" (2/3) ...
[2024-11-02 12:34:27,980 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b5de13b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 12:34:27, skipping insertion in model container
[2024-11-02 12:34:27,980 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 12:34:27" (3/3) ...
[2024-11-02 12:34:27,982 INFO  L112   eAbstractionObserver]: Analyzing ICFG cohendiv-ll_valuebound20.c
[2024-11-02 12:34:28,004 INFO  L214   ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2024-11-02 12:34:28,004 INFO  L154   ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations.
[2024-11-02 12:34:28,065 INFO  L332      AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ========
[2024-11-02 12:34:28,071 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;@68e8c949, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms]
[2024-11-02 12:34:28,071 INFO  L334      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2024-11-02 12:34:28,075 INFO  L276                IsEmpty]: Start isEmpty. Operand  has 29 states, 15 states have (on average 1.4) internal successors, (21), 16 states have internal predecessors, (21), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10)
[2024-11-02 12:34:28,083 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 18
[2024-11-02 12:34:28,084 INFO  L207           NwaCegarLoop]: Found error trace
[2024-11-02 12:34:28,084 INFO  L215           NwaCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2024-11-02 12:34:28,085 INFO  L396      AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2024-11-02 12:34:28,092 INFO  L157       PredicateUnifier]: Initialized classic predicate unifier
[2024-11-02 12:34:28,093 INFO  L85        PathProgramCache]: Analyzing trace with hash -1646389938, now seen corresponding path program 1 times
[2024-11-02 12:34:28,106 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2024-11-02 12:34:28,110 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1109527110]
[2024-11-02 12:34:28,110 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:34:28,111 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2024-11-02 12:34:28,254 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unknown
[2024-11-02 12:34:28,260 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [793582866]
[2024-11-02 12:34:28,260 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:34:28,261 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2024-11-02 12:34:28,261 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3
[2024-11-02 12:34:28,262 INFO  L229       MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2024-11-02 12:34:28,266 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process
[2024-11-02 12:34:28,357 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:34:28,363 INFO  L255         TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 7 conjuncts are in the unsatisfiable core
[2024-11-02 12:34:28,379 INFO  L278         TraceCheckSpWp]: Computing forward predicates...
[2024-11-02 12:34:28,617 INFO  L134       CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2024-11-02 12:34:28,617 INFO  L307         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2024-11-02 12:34:28,617 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2024-11-02 12:34:28,618 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1109527110]
[2024-11-02 12:34:28,618 WARN  L311   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2024-11-02 12:34:28,619 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [793582866]
[2024-11-02 12:34:28,619 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [793582866] provided 1 perfect and 0 imperfect interpolant sequences
[2024-11-02 12:34:28,620 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2024-11-02 12:34:28,620 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2024-11-02 12:34:28,622 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097555210]
[2024-11-02 12:34:28,623 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2024-11-02 12:34:28,631 INFO  L548      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2024-11-02 12:34:28,632 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2024-11-02 12:34:28,656 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2024-11-02 12:34:28,657 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2024-11-02 12:34:28,660 INFO  L87              Difference]: Start difference. First operand  has 29 states, 15 states have (on average 1.4) internal successors, (21), 16 states have internal predecessors, (21), 10 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) Second operand  has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3)
[2024-11-02 12:34:28,852 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2024-11-02 12:34:28,852 INFO  L93              Difference]: Finished difference Result 60 states and 97 transitions.
[2024-11-02 12:34:28,858 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2024-11-02 12:34:28,859 INFO  L78                 Accepts]: Start accepts. Automaton has  has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 17
[2024-11-02 12:34:28,860 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2024-11-02 12:34:28,876 INFO  L225             Difference]: With dead ends: 60
[2024-11-02 12:34:28,876 INFO  L226             Difference]: Without dead ends: 36
[2024-11-02 12:34:28,881 INFO  L431           NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2024-11-02 12:34:28,896 INFO  L432           NwaCegarLoop]: 32 mSDtfsCounter, 4 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2024-11-02 12:34:28,898 INFO  L433           NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 116 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2024-11-02 12:34:28,938 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 36 states.
[2024-11-02 12:34:28,965 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33.
[2024-11-02 12:34:28,969 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 33 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 20 states have internal predecessors, (21), 11 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 9 states have call predecessors, (10), 10 states have call successors, (10)
[2024-11-02 12:34:28,971 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 42 transitions.
[2024-11-02 12:34:28,972 INFO  L78                 Accepts]: Start accepts. Automaton has 33 states and 42 transitions. Word has length 17
[2024-11-02 12:34:28,973 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2024-11-02 12:34:28,973 INFO  L471      AbstractCegarLoop]: Abstraction has 33 states and 42 transitions.
[2024-11-02 12:34:28,974 INFO  L472      AbstractCegarLoop]: INTERPOLANT automaton has  has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3)
[2024-11-02 12:34:28,974 INFO  L276                IsEmpty]: Start isEmpty. Operand 33 states and 42 transitions.
[2024-11-02 12:34:28,975 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 23
[2024-11-02 12:34:28,975 INFO  L207           NwaCegarLoop]: Found error trace
[2024-11-02 12:34:28,976 INFO  L215           NwaCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2024-11-02 12:34:28,994 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0
[2024-11-02 12:34:29,180 WARN  L453      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0
[2024-11-02 12:34:29,181 INFO  L396      AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2024-11-02 12:34:29,182 INFO  L157       PredicateUnifier]: Initialized classic predicate unifier
[2024-11-02 12:34:29,182 INFO  L85        PathProgramCache]: Analyzing trace with hash -849077806, now seen corresponding path program 1 times
[2024-11-02 12:34:29,182 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2024-11-02 12:34:29,182 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1180501987]
[2024-11-02 12:34:29,182 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:34:29,183 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2024-11-02 12:34:29,249 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unknown
[2024-11-02 12:34:29,253 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1355338197]
[2024-11-02 12:34:29,254 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:34:29,255 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2024-11-02 12:34:29,255 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3
[2024-11-02 12:34:29,259 INFO  L229       MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2024-11-02 12:34:29,265 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process
[2024-11-02 12:34:29,354 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:34:29,356 INFO  L255         TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 7 conjuncts are in the unsatisfiable core
[2024-11-02 12:34:29,358 INFO  L278         TraceCheckSpWp]: Computing forward predicates...
[2024-11-02 12:34:29,488 INFO  L134       CoverageAnalysis]: Checked inductivity of 8 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2024-11-02 12:34:29,489 INFO  L307         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2024-11-02 12:34:29,489 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2024-11-02 12:34:29,489 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1180501987]
[2024-11-02 12:34:29,489 WARN  L311   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2024-11-02 12:34:29,489 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355338197]
[2024-11-02 12:34:29,490 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1355338197] provided 1 perfect and 0 imperfect interpolant sequences
[2024-11-02 12:34:29,490 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2024-11-02 12:34:29,490 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2024-11-02 12:34:29,490 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084438963]
[2024-11-02 12:34:29,490 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2024-11-02 12:34:29,491 INFO  L548      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2024-11-02 12:34:29,491 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2024-11-02 12:34:29,492 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2024-11-02 12:34:29,492 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2024-11-02 12:34:29,492 INFO  L87              Difference]: Start difference. First operand 33 states and 42 transitions. Second operand  has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4)
[2024-11-02 12:34:29,624 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2024-11-02 12:34:29,625 INFO  L93              Difference]: Finished difference Result 50 states and 65 transitions.
[2024-11-02 12:34:29,626 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2024-11-02 12:34:29,626 INFO  L78                 Accepts]: Start accepts. Automaton has  has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 22
[2024-11-02 12:34:29,627 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2024-11-02 12:34:29,629 INFO  L225             Difference]: With dead ends: 50
[2024-11-02 12:34:29,629 INFO  L226             Difference]: Without dead ends: 47
[2024-11-02 12:34:29,630 INFO  L431           NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2024-11-02 12:34:29,631 INFO  L432           NwaCegarLoop]: 28 mSDtfsCounter, 9 mSDsluCounter, 73 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2024-11-02 12:34:29,632 INFO  L433           NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 101 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2024-11-02 12:34:29,633 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 47 states.
[2024-11-02 12:34:29,649 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46.
[2024-11-02 12:34:29,651 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 46 states, 25 states have (on average 1.16) internal successors, (29), 26 states have internal predecessors, (29), 16 states have call successors, (16), 4 states have call predecessors, (16), 4 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15)
[2024-11-02 12:34:29,653 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 60 transitions.
[2024-11-02 12:34:29,655 INFO  L78                 Accepts]: Start accepts. Automaton has 46 states and 60 transitions. Word has length 22
[2024-11-02 12:34:29,656 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2024-11-02 12:34:29,656 INFO  L471      AbstractCegarLoop]: Abstraction has 46 states and 60 transitions.
[2024-11-02 12:34:29,656 INFO  L472      AbstractCegarLoop]: INTERPOLANT automaton has  has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4)
[2024-11-02 12:34:29,657 INFO  L276                IsEmpty]: Start isEmpty. Operand 46 states and 60 transitions.
[2024-11-02 12:34:29,657 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 30
[2024-11-02 12:34:29,658 INFO  L207           NwaCegarLoop]: Found error trace
[2024-11-02 12:34:29,658 INFO  L215           NwaCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2024-11-02 12:34:29,680 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0
[2024-11-02 12:34:29,862 WARN  L453      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1
[2024-11-02 12:34:29,865 INFO  L396      AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2024-11-02 12:34:29,866 INFO  L157       PredicateUnifier]: Initialized classic predicate unifier
[2024-11-02 12:34:29,866 INFO  L85        PathProgramCache]: Analyzing trace with hash -1967169097, now seen corresponding path program 1 times
[2024-11-02 12:34:29,867 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2024-11-02 12:34:29,867 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1900509579]
[2024-11-02 12:34:29,867 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:34:29,867 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2024-11-02 12:34:29,927 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unknown
[2024-11-02 12:34:29,936 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1999638640]
[2024-11-02 12:34:29,936 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:34:29,940 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2024-11-02 12:34:29,940 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3
[2024-11-02 12:34:29,945 INFO  L229       MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2024-11-02 12:34:29,946 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process
[2024-11-02 12:34:30,032 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:34:30,033 INFO  L255         TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 7 conjuncts are in the unsatisfiable core
[2024-11-02 12:34:30,035 INFO  L278         TraceCheckSpWp]: Computing forward predicates...
[2024-11-02 12:34:30,111 INFO  L134       CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked.
[2024-11-02 12:34:30,112 INFO  L307         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2024-11-02 12:34:30,112 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2024-11-02 12:34:30,112 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1900509579]
[2024-11-02 12:34:30,112 WARN  L311   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2024-11-02 12:34:30,112 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1999638640]
[2024-11-02 12:34:30,113 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1999638640] provided 1 perfect and 0 imperfect interpolant sequences
[2024-11-02 12:34:30,113 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2024-11-02 12:34:30,114 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2024-11-02 12:34:30,115 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362474837]
[2024-11-02 12:34:30,115 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2024-11-02 12:34:30,115 INFO  L548      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2024-11-02 12:34:30,116 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2024-11-02 12:34:30,116 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2024-11-02 12:34:30,116 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2024-11-02 12:34:30,117 INFO  L87              Difference]: Start difference. First operand 46 states and 60 transitions. Second operand  has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5)
[2024-11-02 12:34:30,242 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2024-11-02 12:34:30,242 INFO  L93              Difference]: Finished difference Result 72 states and 98 transitions.
[2024-11-02 12:34:30,244 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2024-11-02 12:34:30,244 INFO  L78                 Accepts]: Start accepts. Automaton has  has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 29
[2024-11-02 12:34:30,245 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2024-11-02 12:34:30,246 INFO  L225             Difference]: With dead ends: 72
[2024-11-02 12:34:30,246 INFO  L226             Difference]: Without dead ends: 70
[2024-11-02 12:34:30,246 INFO  L431           NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2024-11-02 12:34:30,247 INFO  L432           NwaCegarLoop]: 33 mSDtfsCounter, 8 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2024-11-02 12:34:30,248 INFO  L433           NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 114 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2024-11-02 12:34:30,251 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 70 states.
[2024-11-02 12:34:30,269 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 63.
[2024-11-02 12:34:30,270 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 63 states, 34 states have (on average 1.1764705882352942) internal successors, (40), 36 states have internal predecessors, (40), 23 states have call successors, (23), 5 states have call predecessors, (23), 5 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22)
[2024-11-02 12:34:30,274 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 85 transitions.
[2024-11-02 12:34:30,275 INFO  L78                 Accepts]: Start accepts. Automaton has 63 states and 85 transitions. Word has length 29
[2024-11-02 12:34:30,275 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2024-11-02 12:34:30,275 INFO  L471      AbstractCegarLoop]: Abstraction has 63 states and 85 transitions.
[2024-11-02 12:34:30,275 INFO  L472      AbstractCegarLoop]: INTERPOLANT automaton has  has 5 states, 5 states have (on average 2.6) internal successors, (13), 4 states have internal predecessors, (13), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5)
[2024-11-02 12:34:30,276 INFO  L276                IsEmpty]: Start isEmpty. Operand 63 states and 85 transitions.
[2024-11-02 12:34:30,278 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 40
[2024-11-02 12:34:30,279 INFO  L207           NwaCegarLoop]: Found error trace
[2024-11-02 12:34:30,279 INFO  L215           NwaCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2024-11-02 12:34:30,300 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0
[2024-11-02 12:34:30,483 WARN  L453      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2024-11-02 12:34:30,485 INFO  L396      AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2024-11-02 12:34:30,487 INFO  L157       PredicateUnifier]: Initialized classic predicate unifier
[2024-11-02 12:34:30,487 INFO  L85        PathProgramCache]: Analyzing trace with hash 927902903, now seen corresponding path program 1 times
[2024-11-02 12:34:30,488 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2024-11-02 12:34:30,488 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [714316919]
[2024-11-02 12:34:30,488 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:34:30,488 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2024-11-02 12:34:30,563 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:34:31,030 INFO  L134       CoverageAnalysis]: Checked inductivity of 38 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked.
[2024-11-02 12:34:31,030 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2024-11-02 12:34:31,031 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [714316919]
[2024-11-02 12:34:31,031 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [714316919] provided 0 perfect and 1 imperfect interpolant sequences
[2024-11-02 12:34:31,031 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1577004211]
[2024-11-02 12:34:31,031 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:34:31,031 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2024-11-02 12:34:31,032 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3
[2024-11-02 12:34:31,035 INFO  L229       MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2024-11-02 12:34:31,036 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process
[2024-11-02 12:34:31,105 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:34:31,106 INFO  L255         TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 19 conjuncts are in the unsatisfiable core
[2024-11-02 12:34:31,109 INFO  L278         TraceCheckSpWp]: Computing forward predicates...
[2024-11-02 12:34:31,286 INFO  L134       CoverageAnalysis]: Checked inductivity of 38 backedges. 9 proven. 10 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked.
[2024-11-02 12:34:31,286 INFO  L311         TraceCheckSpWp]: Computing backward predicates...
[2024-11-02 12:34:31,557 INFO  L134       CoverageAnalysis]: Checked inductivity of 38 backedges. 9 proven. 10 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked.
[2024-11-02 12:34:31,557 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1577004211] provided 0 perfect and 2 imperfect interpolant sequences
[2024-11-02 12:34:31,558 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [691914287]
[2024-11-02 12:34:31,585 INFO  L159        IcfgInterpreter]: Started Sifa with 22 locations of interest
[2024-11-02 12:34:31,585 INFO  L166        IcfgInterpreter]: Building call graph
[2024-11-02 12:34:31,589 INFO  L171        IcfgInterpreter]: Initial procedures are [ULTIMATE.start]
[2024-11-02 12:34:31,597 INFO  L176        IcfgInterpreter]: Starting interpretation
[2024-11-02 12:34:31,597 INFO  L197        IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs
[2024-11-02 12:34:32,679 INFO  L197        IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs
[2024-11-02 12:34:32,695 INFO  L197        IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs
[2024-11-02 12:34:32,697 INFO  L180        IcfgInterpreter]: Interpretation finished
[2024-11-02 12:34:33,787 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSifa [691914287] provided 1 perfect and 0 imperfect interpolant sequences
[2024-11-02 12:34:33,788 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences.
[2024-11-02 12:34:33,789 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [8, 10, 9] total 28
[2024-11-02 12:34:33,790 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1345949978]
[2024-11-02 12:34:33,790 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2024-11-02 12:34:33,792 INFO  L548      AbstractCegarLoop]: INTERPOLANT automaton has 13 states
[2024-11-02 12:34:33,792 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2024-11-02 12:34:33,793 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2024-11-02 12:34:33,793 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=131, Invalid=625, Unknown=0, NotChecked=0, Total=756
[2024-11-02 12:34:33,794 INFO  L87              Difference]: Start difference. First operand 63 states and 85 transitions. Second operand  has 13 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7)
[2024-11-02 12:34:34,113 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2024-11-02 12:34:34,113 INFO  L93              Difference]: Finished difference Result 80 states and 100 transitions.
[2024-11-02 12:34:34,114 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. 
[2024-11-02 12:34:34,114 INFO  L78                 Accepts]: Start accepts. Automaton has  has 13 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 39
[2024-11-02 12:34:34,115 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2024-11-02 12:34:34,117 INFO  L225             Difference]: With dead ends: 80
[2024-11-02 12:34:34,118 INFO  L226             Difference]: Without dead ends: 78
[2024-11-02 12:34:34,120 INFO  L431           NwaCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 92 SyntacticMatches, 5 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=131, Invalid=625, Unknown=0, NotChecked=0, Total=756
[2024-11-02 12:34:34,122 INFO  L432           NwaCegarLoop]: 16 mSDtfsCounter, 29 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 158 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time
[2024-11-02 12:34:34,123 INFO  L433           NwaCegarLoop]: SdHoareTripleChecker [37 Valid, 43 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 158 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time]
[2024-11-02 12:34:34,124 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 78 states.
[2024-11-02 12:34:34,156 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 75.
[2024-11-02 12:34:34,157 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 75 states, 43 states have (on average 1.1395348837209303) internal successors, (49), 45 states have internal predecessors, (49), 23 states have call successors, (23), 8 states have call predecessors, (23), 8 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22)
[2024-11-02 12:34:34,161 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 94 transitions.
[2024-11-02 12:34:34,162 INFO  L78                 Accepts]: Start accepts. Automaton has 75 states and 94 transitions. Word has length 39
[2024-11-02 12:34:34,163 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2024-11-02 12:34:34,163 INFO  L471      AbstractCegarLoop]: Abstraction has 75 states and 94 transitions.
[2024-11-02 12:34:34,164 INFO  L472      AbstractCegarLoop]: INTERPOLANT automaton has  has 13 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 8 states have internal predecessors, (12), 5 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7)
[2024-11-02 12:34:34,164 INFO  L276                IsEmpty]: Start isEmpty. Operand 75 states and 94 transitions.
[2024-11-02 12:34:34,165 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 46
[2024-11-02 12:34:34,165 INFO  L207           NwaCegarLoop]: Found error trace
[2024-11-02 12:34:34,165 INFO  L215           NwaCegarLoop]: trace histogram [6, 5, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2024-11-02 12:34:34,186 INFO  L552       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0
[2024-11-02 12:34:34,366 WARN  L453      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2024-11-02 12:34:34,366 INFO  L396      AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2024-11-02 12:34:34,366 INFO  L157       PredicateUnifier]: Initialized classic predicate unifier
[2024-11-02 12:34:34,367 INFO  L85        PathProgramCache]: Analyzing trace with hash 794028461, now seen corresponding path program 1 times
[2024-11-02 12:34:34,367 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2024-11-02 12:34:34,367 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [192400120]
[2024-11-02 12:34:34,371 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:34:34,372 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2024-11-02 12:34:34,403 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:34:34,662 INFO  L134       CoverageAnalysis]: Checked inductivity of 56 backedges. 15 proven. 7 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked.
[2024-11-02 12:34:34,662 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2024-11-02 12:34:34,663 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [192400120]
[2024-11-02 12:34:34,663 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [192400120] provided 0 perfect and 1 imperfect interpolant sequences
[2024-11-02 12:34:34,663 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2013752695]
[2024-11-02 12:34:34,664 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:34:34,664 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2024-11-02 12:34:34,664 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3
[2024-11-02 12:34:34,666 INFO  L229       MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2024-11-02 12:34:34,668 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process
[2024-11-02 12:34:34,729 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:34:34,730 INFO  L255         TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 7 conjuncts are in the unsatisfiable core
[2024-11-02 12:34:34,732 INFO  L278         TraceCheckSpWp]: Computing forward predicates...
[2024-11-02 12:34:34,828 INFO  L134       CoverageAnalysis]: Checked inductivity of 56 backedges. 10 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked.
[2024-11-02 12:34:34,830 INFO  L307         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2024-11-02 12:34:34,831 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [2013752695] provided 1 perfect and 0 imperfect interpolant sequences
[2024-11-02 12:34:34,831 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences.
[2024-11-02 12:34:34,831 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7] total 11
[2024-11-02 12:34:34,831 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550209161]
[2024-11-02 12:34:34,831 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2024-11-02 12:34:34,832 INFO  L548      AbstractCegarLoop]: INTERPOLANT automaton has 6 states
[2024-11-02 12:34:34,832 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2024-11-02 12:34:34,833 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2024-11-02 12:34:34,833 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110
[2024-11-02 12:34:34,833 INFO  L87              Difference]: Start difference. First operand 75 states and 94 transitions. Second operand  has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8)
[2024-11-02 12:34:35,020 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2024-11-02 12:34:35,021 INFO  L93              Difference]: Finished difference Result 88 states and 110 transitions.
[2024-11-02 12:34:35,021 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2024-11-02 12:34:35,021 INFO  L78                 Accepts]: Start accepts. Automaton has  has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 45
[2024-11-02 12:34:35,022 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2024-11-02 12:34:35,023 INFO  L225             Difference]: With dead ends: 88
[2024-11-02 12:34:35,023 INFO  L226             Difference]: Without dead ends: 86
[2024-11-02 12:34:35,024 INFO  L431           NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156
[2024-11-02 12:34:35,025 INFO  L432           NwaCegarLoop]: 34 mSDtfsCounter, 8 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 72 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 144 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 72 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2024-11-02 12:34:35,027 INFO  L433           NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 144 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 72 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2024-11-02 12:34:35,030 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 86 states.
[2024-11-02 12:34:35,077 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 81.
[2024-11-02 12:34:35,079 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 81 states, 46 states have (on average 1.1304347826086956) internal successors, (52), 50 states have internal predecessors, (52), 25 states have call successors, (25), 9 states have call predecessors, (25), 9 states have return successors, (24), 21 states have call predecessors, (24), 24 states have call successors, (24)
[2024-11-02 12:34:35,080 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 101 transitions.
[2024-11-02 12:34:35,081 INFO  L78                 Accepts]: Start accepts. Automaton has 81 states and 101 transitions. Word has length 45
[2024-11-02 12:34:35,082 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2024-11-02 12:34:35,082 INFO  L471      AbstractCegarLoop]: Abstraction has 81 states and 101 transitions.
[2024-11-02 12:34:35,084 INFO  L472      AbstractCegarLoop]: INTERPOLANT automaton has  has 6 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8)
[2024-11-02 12:34:35,084 INFO  L276                IsEmpty]: Start isEmpty. Operand 81 states and 101 transitions.
[2024-11-02 12:34:35,086 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 53
[2024-11-02 12:34:35,086 INFO  L207           NwaCegarLoop]: Found error trace
[2024-11-02 12:34:35,086 INFO  L215           NwaCegarLoop]: trace histogram [7, 6, 6, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2024-11-02 12:34:35,109 INFO  L552       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0
[2024-11-02 12:34:35,287 WARN  L453      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2024-11-02 12:34:35,288 INFO  L396      AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2024-11-02 12:34:35,288 INFO  L157       PredicateUnifier]: Initialized classic predicate unifier
[2024-11-02 12:34:35,288 INFO  L85        PathProgramCache]: Analyzing trace with hash 1669435945, now seen corresponding path program 1 times
[2024-11-02 12:34:35,289 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2024-11-02 12:34:35,289 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199820614]
[2024-11-02 12:34:35,289 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:34:35,289 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2024-11-02 12:34:35,307 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unknown
[2024-11-02 12:34:35,308 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1769949553]
[2024-11-02 12:34:35,309 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:34:35,309 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2024-11-02 12:34:35,309 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3
[2024-11-02 12:34:35,311 INFO  L229       MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2024-11-02 12:34:35,313 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process
[2024-11-02 12:34:35,372 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:34:35,374 INFO  L255         TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 25 conjuncts are in the unsatisfiable core
[2024-11-02 12:34:35,377 INFO  L278         TraceCheckSpWp]: Computing forward predicates...
[2024-11-02 12:34:35,672 INFO  L134       CoverageAnalysis]: Checked inductivity of 81 backedges. 23 proven. 7 refuted. 0 times theorem prover too weak. 51 trivial. 0 not checked.
[2024-11-02 12:34:35,672 INFO  L311         TraceCheckSpWp]: Computing backward predicates...
[2024-11-02 12:34:35,970 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2024-11-02 12:34:35,970 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199820614]
[2024-11-02 12:34:35,970 WARN  L311   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2024-11-02 12:34:35,971 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1769949553]
[2024-11-02 12:34:35,971 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1769949553] provided 0 perfect and 1 imperfect interpolant sequences
[2024-11-02 12:34:35,971 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [426147510]
[2024-11-02 12:34:35,973 INFO  L159        IcfgInterpreter]: Started Sifa with 24 locations of interest
[2024-11-02 12:34:35,974 INFO  L166        IcfgInterpreter]: Building call graph
[2024-11-02 12:34:35,974 INFO  L171        IcfgInterpreter]: Initial procedures are [ULTIMATE.start]
[2024-11-02 12:34:35,974 INFO  L176        IcfgInterpreter]: Starting interpretation
[2024-11-02 12:34:35,974 INFO  L197        IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs
[2024-11-02 12:34:39,704 INFO  L197        IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs
[2024-11-02 12:34:39,709 INFO  L197        IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs
[2024-11-02 12:34:39,710 INFO  L180        IcfgInterpreter]: Interpretation finished
[2024-11-02 12:34:42,033 INFO  L133             SifaRunner]: Sifa could not show that error location is unreachable, found '1951#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location
[2024-11-02 12:34:42,033 WARN  L311   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED
[2024-11-02 12:34:42,033 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences.
[2024-11-02 12:34:42,033 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11
[2024-11-02 12:34:42,034 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255693562]
[2024-11-02 12:34:42,034 INFO  L85    oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton
[2024-11-02 12:34:42,034 INFO  L548      AbstractCegarLoop]: INTERPOLANT automaton has 11 states
[2024-11-02 12:34:42,034 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2024-11-02 12:34:42,035 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2024-11-02 12:34:42,035 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=824, Unknown=0, NotChecked=0, Total=992
[2024-11-02 12:34:42,035 INFO  L87              Difference]: Start difference. First operand 81 states and 101 transitions. Second operand  has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 9 states have internal predecessors, (19), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9)
[2024-11-02 12:34:42,259 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2024-11-02 12:34:42,259 INFO  L93              Difference]: Finished difference Result 129 states and 163 transitions.
[2024-11-02 12:34:42,260 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. 
[2024-11-02 12:34:42,260 INFO  L78                 Accepts]: Start accepts. Automaton has  has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 9 states have internal predecessors, (19), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9) Word has length 52
[2024-11-02 12:34:42,260 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2024-11-02 12:34:42,261 INFO  L225             Difference]: With dead ends: 129
[2024-11-02 12:34:42,261 INFO  L226             Difference]: Without dead ends: 83
[2024-11-02 12:34:42,263 INFO  L431           NwaCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 97 SyntacticMatches, 6 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 1 DeprecatedPredicates, 405 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=176, Invalid=880, Unknown=0, NotChecked=0, Total=1056
[2024-11-02 12:34:42,263 INFO  L432           NwaCegarLoop]: 24 mSDtfsCounter, 13 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 156 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 156 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time
[2024-11-02 12:34:42,264 INFO  L433           NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 123 Invalid, 169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 156 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time]
[2024-11-02 12:34:42,264 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 83 states.
[2024-11-02 12:34:42,297 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 81.
[2024-11-02 12:34:42,298 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 81 states, 46 states have (on average 1.108695652173913) internal successors, (51), 50 states have internal predecessors, (51), 25 states have call successors, (25), 9 states have call predecessors, (25), 9 states have return successors, (24), 21 states have call predecessors, (24), 24 states have call successors, (24)
[2024-11-02 12:34:42,299 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 100 transitions.
[2024-11-02 12:34:42,299 INFO  L78                 Accepts]: Start accepts. Automaton has 81 states and 100 transitions. Word has length 52
[2024-11-02 12:34:42,300 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2024-11-02 12:34:42,300 INFO  L471      AbstractCegarLoop]: Abstraction has 81 states and 100 transitions.
[2024-11-02 12:34:42,300 INFO  L472      AbstractCegarLoop]: INTERPOLANT automaton has  has 11 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 9 states have internal predecessors, (19), 4 states have call successors, (10), 2 states have call predecessors, (10), 2 states have return successors, (9), 5 states have call predecessors, (9), 4 states have call successors, (9)
[2024-11-02 12:34:42,301 INFO  L276                IsEmpty]: Start isEmpty. Operand 81 states and 100 transitions.
[2024-11-02 12:34:42,301 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 53
[2024-11-02 12:34:42,302 INFO  L207           NwaCegarLoop]: Found error trace
[2024-11-02 12:34:42,302 INFO  L215           NwaCegarLoop]: trace histogram [7, 6, 6, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2024-11-02 12:34:42,326 INFO  L552       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0
[2024-11-02 12:34:42,502 WARN  L453      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2024-11-02 12:34:42,503 INFO  L396      AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2024-11-02 12:34:42,503 INFO  L157       PredicateUnifier]: Initialized classic predicate unifier
[2024-11-02 12:34:42,504 INFO  L85        PathProgramCache]: Analyzing trace with hash -1502084271, now seen corresponding path program 1 times
[2024-11-02 12:34:42,504 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2024-11-02 12:34:42,504 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [614536240]
[2024-11-02 12:34:42,504 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:34:42,504 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2024-11-02 12:34:42,524 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unknown
[2024-11-02 12:34:42,525 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [370645436]
[2024-11-02 12:34:42,525 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:34:42,526 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2024-11-02 12:34:42,526 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3
[2024-11-02 12:34:42,528 INFO  L229       MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2024-11-02 12:34:42,531 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process
[2024-11-02 12:34:42,590 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:34:42,591 INFO  L255         TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 11 conjuncts are in the unsatisfiable core
[2024-11-02 12:34:42,595 INFO  L278         TraceCheckSpWp]: Computing forward predicates...
[2024-11-02 12:34:42,676 INFO  L134       CoverageAnalysis]: Checked inductivity of 80 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked.
[2024-11-02 12:34:42,676 INFO  L311         TraceCheckSpWp]: Computing backward predicates...
[2024-11-02 12:34:42,775 INFO  L134       CoverageAnalysis]: Checked inductivity of 80 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 68 trivial. 0 not checked.
[2024-11-02 12:34:42,775 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2024-11-02 12:34:42,776 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [614536240]
[2024-11-02 12:34:42,776 WARN  L311   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2024-11-02 12:34:42,776 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [370645436]
[2024-11-02 12:34:42,776 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [370645436] provided 1 perfect and 1 imperfect interpolant sequences
[2024-11-02 12:34:42,776 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences.
[2024-11-02 12:34:42,777 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 7
[2024-11-02 12:34:42,777 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862044328]
[2024-11-02 12:34:42,777 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2024-11-02 12:34:42,777 INFO  L548      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2024-11-02 12:34:42,778 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2024-11-02 12:34:42,778 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2024-11-02 12:34:42,779 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42
[2024-11-02 12:34:42,779 INFO  L87              Difference]: Start difference. First operand 81 states and 100 transitions. Second operand  has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9)
[2024-11-02 12:34:42,868 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2024-11-02 12:34:42,869 INFO  L93              Difference]: Finished difference Result 87 states and 105 transitions.
[2024-11-02 12:34:42,869 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2024-11-02 12:34:42,870 INFO  L78                 Accepts]: Start accepts. Automaton has  has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9) Word has length 52
[2024-11-02 12:34:42,870 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2024-11-02 12:34:42,872 INFO  L225             Difference]: With dead ends: 87
[2024-11-02 12:34:42,875 INFO  L226             Difference]: Without dead ends: 85
[2024-11-02 12:34:42,875 INFO  L431           NwaCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 95 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56
[2024-11-02 12:34:42,876 INFO  L432           NwaCegarLoop]: 24 mSDtfsCounter, 7 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 81 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2024-11-02 12:34:42,877 INFO  L433           NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 81 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2024-11-02 12:34:42,878 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 85 states.
[2024-11-02 12:34:42,913 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85.
[2024-11-02 12:34:42,914 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 85 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 53 states have internal predecessors, (54), 25 states have call successors, (25), 10 states have call predecessors, (25), 10 states have return successors, (24), 21 states have call predecessors, (24), 24 states have call successors, (24)
[2024-11-02 12:34:42,915 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 103 transitions.
[2024-11-02 12:34:42,916 INFO  L78                 Accepts]: Start accepts. Automaton has 85 states and 103 transitions. Word has length 52
[2024-11-02 12:34:42,916 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2024-11-02 12:34:42,916 INFO  L471      AbstractCegarLoop]: Abstraction has 85 states and 103 transitions.
[2024-11-02 12:34:42,917 INFO  L472      AbstractCegarLoop]: INTERPOLANT automaton has  has 5 states, 5 states have (on average 3.0) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 2 states have call predecessors, (9), 2 states have call successors, (9)
[2024-11-02 12:34:42,917 INFO  L276                IsEmpty]: Start isEmpty. Operand 85 states and 103 transitions.
[2024-11-02 12:34:42,918 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 63
[2024-11-02 12:34:42,918 INFO  L207           NwaCegarLoop]: Found error trace
[2024-11-02 12:34:42,918 INFO  L215           NwaCegarLoop]: trace histogram [9, 8, 8, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2024-11-02 12:34:42,939 INFO  L552       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0
[2024-11-02 12:34:43,122 WARN  L453      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2024-11-02 12:34:43,123 INFO  L396      AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2024-11-02 12:34:43,123 INFO  L157       PredicateUnifier]: Initialized classic predicate unifier
[2024-11-02 12:34:43,123 INFO  L85        PathProgramCache]: Analyzing trace with hash 1929745873, now seen corresponding path program 2 times
[2024-11-02 12:34:43,123 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2024-11-02 12:34:43,123 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1736104608]
[2024-11-02 12:34:43,123 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:34:43,124 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2024-11-02 12:34:43,135 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:34:43,278 INFO  L134       CoverageAnalysis]: Checked inductivity of 138 backedges. 31 proven. 10 refuted. 0 times theorem prover too weak. 97 trivial. 0 not checked.
[2024-11-02 12:34:43,279 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2024-11-02 12:34:43,279 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1736104608]
[2024-11-02 12:34:43,279 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1736104608] provided 0 perfect and 1 imperfect interpolant sequences
[2024-11-02 12:34:43,279 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1573165147]
[2024-11-02 12:34:43,279 INFO  L93    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2
[2024-11-02 12:34:43,279 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2024-11-02 12:34:43,280 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3
[2024-11-02 12:34:43,285 INFO  L229       MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2024-11-02 12:34:43,288 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process
[2024-11-02 12:34:43,341 INFO  L227   tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s)
[2024-11-02 12:34:43,341 INFO  L228   tOrderPrioritization]: Conjunction of SSA is unsat
[2024-11-02 12:34:43,342 INFO  L255         TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 10 conjuncts are in the unsatisfiable core
[2024-11-02 12:34:43,348 INFO  L278         TraceCheckSpWp]: Computing forward predicates...
[2024-11-02 12:34:43,434 INFO  L134       CoverageAnalysis]: Checked inductivity of 138 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked.
[2024-11-02 12:34:43,435 INFO  L311         TraceCheckSpWp]: Computing backward predicates...
[2024-11-02 12:34:43,553 INFO  L134       CoverageAnalysis]: Checked inductivity of 138 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked.
[2024-11-02 12:34:43,554 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1573165147] provided 0 perfect and 2 imperfect interpolant sequences
[2024-11-02 12:34:43,554 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [60385103]
[2024-11-02 12:34:43,556 INFO  L159        IcfgInterpreter]: Started Sifa with 25 locations of interest
[2024-11-02 12:34:43,556 INFO  L166        IcfgInterpreter]: Building call graph
[2024-11-02 12:34:43,557 INFO  L171        IcfgInterpreter]: Initial procedures are [ULTIMATE.start]
[2024-11-02 12:34:43,557 INFO  L176        IcfgInterpreter]: Starting interpretation
[2024-11-02 12:34:43,557 INFO  L197        IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs
[2024-11-02 12:34:45,066 INFO  L197        IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs
[2024-11-02 12:34:45,072 INFO  L197        IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs
[2024-11-02 12:34:45,073 INFO  L180        IcfgInterpreter]: Interpretation finished
[2024-11-02 12:34:47,034 INFO  L133             SifaRunner]: Sifa could not show that error location is unreachable, found '3273#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location
[2024-11-02 12:34:47,034 WARN  L311   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED
[2024-11-02 12:34:47,034 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2024-11-02 12:34:47,034 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7, 7] total 11
[2024-11-02 12:34:47,035 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120468890]
[2024-11-02 12:34:47,035 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2024-11-02 12:34:47,035 INFO  L548      AbstractCegarLoop]: INTERPOLANT automaton has 11 states
[2024-11-02 12:34:47,036 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2024-11-02 12:34:47,036 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2024-11-02 12:34:47,037 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=580, Unknown=0, NotChecked=0, Total=702
[2024-11-02 12:34:47,037 INFO  L87              Difference]: Start difference. First operand 85 states and 103 transitions. Second operand  has 11 states, 10 states have (on average 2.8) internal successors, (28), 10 states have internal predecessors, (28), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (20), 4 states have call predecessors, (20), 4 states have call successors, (20)
[2024-11-02 12:34:47,259 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2024-11-02 12:34:47,260 INFO  L93              Difference]: Finished difference Result 91 states and 108 transitions.
[2024-11-02 12:34:47,261 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. 
[2024-11-02 12:34:47,261 INFO  L78                 Accepts]: Start accepts. Automaton has  has 11 states, 10 states have (on average 2.8) internal successors, (28), 10 states have internal predecessors, (28), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (20), 4 states have call predecessors, (20), 4 states have call successors, (20) Word has length 62
[2024-11-02 12:34:47,261 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2024-11-02 12:34:47,263 INFO  L225             Difference]: With dead ends: 91
[2024-11-02 12:34:47,263 INFO  L226             Difference]: Without dead ends: 89
[2024-11-02 12:34:47,264 INFO  L431           NwaCegarLoop]: 0 DeclaredPredicates, 194 GetRequests, 163 SyntacticMatches, 4 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=140, Invalid=672, Unknown=0, NotChecked=0, Total=812
[2024-11-02 12:34:47,264 INFO  L432           NwaCegarLoop]: 19 mSDtfsCounter, 16 mSDsluCounter, 127 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 193 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time
[2024-11-02 12:34:47,265 INFO  L433           NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 146 Invalid, 193 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time]
[2024-11-02 12:34:47,265 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 89 states.
[2024-11-02 12:34:47,286 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89.
[2024-11-02 12:34:47,286 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 89 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 56 states have internal predecessors, (57), 25 states have call successors, (25), 11 states have call predecessors, (25), 11 states have return successors, (24), 21 states have call predecessors, (24), 24 states have call successors, (24)
[2024-11-02 12:34:47,287 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 106 transitions.
[2024-11-02 12:34:47,288 INFO  L78                 Accepts]: Start accepts. Automaton has 89 states and 106 transitions. Word has length 62
[2024-11-02 12:34:47,288 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2024-11-02 12:34:47,288 INFO  L471      AbstractCegarLoop]: Abstraction has 89 states and 106 transitions.
[2024-11-02 12:34:47,289 INFO  L472      AbstractCegarLoop]: INTERPOLANT automaton has  has 11 states, 10 states have (on average 2.8) internal successors, (28), 10 states have internal predecessors, (28), 4 states have call successors, (20), 3 states have call predecessors, (20), 3 states have return successors, (20), 4 states have call predecessors, (20), 4 states have call successors, (20)
[2024-11-02 12:34:47,289 INFO  L276                IsEmpty]: Start isEmpty. Operand 89 states and 106 transitions.
[2024-11-02 12:34:47,290 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 69
[2024-11-02 12:34:47,290 INFO  L207           NwaCegarLoop]: Found error trace
[2024-11-02 12:34:47,290 INFO  L215           NwaCegarLoop]: trace histogram [10, 9, 9, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2024-11-02 12:34:47,310 INFO  L552       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0
[2024-11-02 12:34:47,490 WARN  L453      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2024-11-02 12:34:47,491 INFO  L396      AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2024-11-02 12:34:47,491 INFO  L157       PredicateUnifier]: Initialized classic predicate unifier
[2024-11-02 12:34:47,491 INFO  L85        PathProgramCache]: Analyzing trace with hash 903485255, now seen corresponding path program 3 times
[2024-11-02 12:34:47,491 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2024-11-02 12:34:47,491 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [46161601]
[2024-11-02 12:34:47,491 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:34:47,491 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2024-11-02 12:34:47,509 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:34:47,671 INFO  L134       CoverageAnalysis]: Checked inductivity of 174 backedges. 39 proven. 7 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked.
[2024-11-02 12:34:47,672 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2024-11-02 12:34:47,672 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [46161601]
[2024-11-02 12:34:47,672 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [46161601] provided 0 perfect and 1 imperfect interpolant sequences
[2024-11-02 12:34:47,672 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [40312048]
[2024-11-02 12:34:47,672 INFO  L93    rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST
[2024-11-02 12:34:47,672 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2024-11-02 12:34:47,673 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3
[2024-11-02 12:34:47,675 INFO  L229       MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2024-11-02 12:34:47,676 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process
[2024-11-02 12:34:47,735 INFO  L227   tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s)
[2024-11-02 12:34:47,736 INFO  L228   tOrderPrioritization]: Conjunction of SSA is unsat
[2024-11-02 12:34:47,737 INFO  L255         TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 9 conjuncts are in the unsatisfiable core
[2024-11-02 12:34:47,740 INFO  L278         TraceCheckSpWp]: Computing forward predicates...
[2024-11-02 12:34:47,799 INFO  L134       CoverageAnalysis]: Checked inductivity of 174 backedges. 39 proven. 7 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked.
[2024-11-02 12:34:47,800 INFO  L311         TraceCheckSpWp]: Computing backward predicates...
[2024-11-02 12:34:47,921 INFO  L134       CoverageAnalysis]: Checked inductivity of 174 backedges. 39 proven. 7 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked.
[2024-11-02 12:34:47,921 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [40312048] provided 0 perfect and 2 imperfect interpolant sequences
[2024-11-02 12:34:47,921 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [361898953]
[2024-11-02 12:34:47,924 INFO  L159        IcfgInterpreter]: Started Sifa with 25 locations of interest
[2024-11-02 12:34:47,924 INFO  L166        IcfgInterpreter]: Building call graph
[2024-11-02 12:34:47,924 INFO  L171        IcfgInterpreter]: Initial procedures are [ULTIMATE.start]
[2024-11-02 12:34:47,924 INFO  L176        IcfgInterpreter]: Starting interpretation
[2024-11-02 12:34:47,924 INFO  L197        IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs
[2024-11-02 12:34:49,478 INFO  L197        IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 3 for LOIs
[2024-11-02 12:34:49,486 INFO  L197        IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 3 for LOIs
[2024-11-02 12:34:49,487 INFO  L180        IcfgInterpreter]: Interpretation finished
[2024-11-02 12:34:50,873 INFO  L133             SifaRunner]: Sifa could not show that error location is unreachable, found '3995#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0))' at error location
[2024-11-02 12:34:50,874 WARN  L311   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED
[2024-11-02 12:34:50,874 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2024-11-02 12:34:50,874 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8] total 11
[2024-11-02 12:34:50,874 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608144124]
[2024-11-02 12:34:50,874 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2024-11-02 12:34:50,875 INFO  L548      AbstractCegarLoop]: INTERPOLANT automaton has 11 states
[2024-11-02 12:34:50,875 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2024-11-02 12:34:50,883 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2024-11-02 12:34:50,884 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=590, Unknown=0, NotChecked=0, Total=702
[2024-11-02 12:34:50,885 INFO  L87              Difference]: Start difference. First operand 89 states and 106 transitions. Second operand  has 11 states, 10 states have (on average 2.4) internal successors, (24), 8 states have internal predecessors, (24), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15)
[2024-11-02 12:34:51,081 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2024-11-02 12:34:51,082 INFO  L93              Difference]: Finished difference Result 95 states and 111 transitions.
[2024-11-02 12:34:51,082 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2024-11-02 12:34:51,082 INFO  L78                 Accepts]: Start accepts. Automaton has  has 11 states, 10 states have (on average 2.4) internal successors, (24), 8 states have internal predecessors, (24), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 68
[2024-11-02 12:34:51,083 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2024-11-02 12:34:51,083 INFO  L225             Difference]: With dead ends: 95
[2024-11-02 12:34:51,083 INFO  L226             Difference]: Without dead ends: 93
[2024-11-02 12:34:51,084 INFO  L431           NwaCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 179 SyntacticMatches, 7 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=127, Invalid=685, Unknown=0, NotChecked=0, Total=812
[2024-11-02 12:34:51,085 INFO  L432           NwaCegarLoop]: 19 mSDtfsCounter, 16 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2024-11-02 12:34:51,085 INFO  L433           NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 124 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2024-11-02 12:34:51,086 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 93 states.
[2024-11-02 12:34:51,102 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 87.
[2024-11-02 12:34:51,103 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 87 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 54 states have internal predecessors, (57), 23 states have call successors, (23), 11 states have call predecessors, (23), 11 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22)
[2024-11-02 12:34:51,104 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 102 transitions.
[2024-11-02 12:34:51,104 INFO  L78                 Accepts]: Start accepts. Automaton has 87 states and 102 transitions. Word has length 68
[2024-11-02 12:34:51,104 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2024-11-02 12:34:51,105 INFO  L471      AbstractCegarLoop]: Abstraction has 87 states and 102 transitions.
[2024-11-02 12:34:51,105 INFO  L472      AbstractCegarLoop]: INTERPOLANT automaton has  has 11 states, 10 states have (on average 2.4) internal successors, (24), 8 states have internal predecessors, (24), 4 states have call successors, (15), 3 states have call predecessors, (15), 2 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15)
[2024-11-02 12:34:51,105 INFO  L276                IsEmpty]: Start isEmpty. Operand 87 states and 102 transitions.
[2024-11-02 12:34:51,106 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 76
[2024-11-02 12:34:51,106 INFO  L207           NwaCegarLoop]: Found error trace
[2024-11-02 12:34:51,106 INFO  L215           NwaCegarLoop]: trace histogram [11, 10, 10, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2024-11-02 12:34:51,125 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0
[2024-11-02 12:34:51,307 WARN  L453      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2024-11-02 12:34:51,307 INFO  L396      AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2024-11-02 12:34:51,307 INFO  L157       PredicateUnifier]: Initialized classic predicate unifier
[2024-11-02 12:34:51,308 INFO  L85        PathProgramCache]: Analyzing trace with hash 747881295, now seen corresponding path program 1 times
[2024-11-02 12:34:51,308 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2024-11-02 12:34:51,308 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [966700855]
[2024-11-02 12:34:51,308 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:34:51,308 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2024-11-02 12:34:51,339 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unknown
[2024-11-02 12:34:51,344 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [716756916]
[2024-11-02 12:34:51,344 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:34:51,344 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2024-11-02 12:34:51,344 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3
[2024-11-02 12:34:51,347 INFO  L229       MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2024-11-02 12:34:51,348 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60081efd-4c37-4030-aaf4-67006b056d7a/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process
[2024-11-02 12:34:51,411 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:34:51,413 INFO  L255         TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 29 conjuncts are in the unsatisfiable core
[2024-11-02 12:34:51,415 INFO  L278         TraceCheckSpWp]: Computing forward predicates...
[2024-11-02 12:34:51,809 INFO  L134       CoverageAnalysis]: Checked inductivity of 214 backedges. 31 proven. 24 refuted. 0 times theorem prover too weak. 159 trivial. 0 not checked.
[2024-11-02 12:34:51,809 INFO  L311         TraceCheckSpWp]: Computing backward predicates...
[2024-11-02 12:34:54,649 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2024-11-02 12:34:54,649 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [966700855]
[2024-11-02 12:34:54,649 WARN  L311   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2024-11-02 12:34:54,649 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [716756916]
[2024-11-02 12:34:54,650 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [716756916] provided 0 perfect and 1 imperfect interpolant sequences
[2024-11-02 12:34:54,650 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1574274723]
[2024-11-02 12:34:54,652 INFO  L159        IcfgInterpreter]: Started Sifa with 26 locations of interest
[2024-11-02 12:34:54,652 INFO  L166        IcfgInterpreter]: Building call graph
[2024-11-02 12:34:54,653 INFO  L171        IcfgInterpreter]: Initial procedures are [ULTIMATE.start]
[2024-11-02 12:34:54,653 INFO  L176        IcfgInterpreter]: Starting interpretation
[2024-11-02 12:34:54,653 INFO  L197        IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs