./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.4.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit


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


Checking for ERROR reachability
Using default analysis
Version 4fc63b2a
Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2f34c16-a953-4ccd-81de-907433ff28d2/bin/utaipan-verify-DbMuA5NWw2/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2f34c16-a953-4ccd-81de-907433ff28d2/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_f2f34c16-a953-4ccd-81de-907433ff28d2/bin/utaipan-verify-DbMuA5NWw2/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2f34c16-a953-4ccd-81de-907433ff28d2/bin/utaipan-verify-DbMuA5NWw2/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.4.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2f34c16-a953-4ccd-81de-907433ff28d2/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_f2f34c16-a953-4ccd-81de-907433ff28d2/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 205f0e0aff0d53187144e7eaaf7c9176a7ca6bc04dd0065235effeefd306421c
--- Real Ultimate output ---
This is Ultimate 0.2.5-dev-4fc63b2
[2024-11-02 12:24:59,021 INFO  L188        SettingsManager]: Resetting all preferences to default values...
[2024-11-02 12:24:59,112 INFO  L114        SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2f34c16-a953-4ccd-81de-907433ff28d2/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-Reach-32bit-Taipan_Default.epf
[2024-11-02 12:24:59,117 WARN  L101        SettingsManager]: Preference file contains the following unknown settings:
[2024-11-02 12:24:59,119 WARN  L103        SettingsManager]:   * de.uni_freiburg.informatik.ultimate.core.Log level for class
[2024-11-02 12:24:59,154 INFO  L130        SettingsManager]: Preferences different from defaults after loading the file:
[2024-11-02 12:24:59,155 INFO  L151        SettingsManager]: Preferences of UltimateCore differ from their defaults:
[2024-11-02 12:24:59,156 INFO  L153        SettingsManager]:  * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR;
[2024-11-02 12:24:59,157 INFO  L151        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2024-11-02 12:24:59,158 INFO  L153        SettingsManager]:  * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS
[2024-11-02 12:24:59,158 INFO  L153        SettingsManager]:  * User list type=DISABLED
[2024-11-02 12:24:59,159 INFO  L151        SettingsManager]: Preferences of Abstract Interpretation differ from their defaults:
[2024-11-02 12:24:59,159 INFO  L153        SettingsManager]:  * Explicit value domain=true
[2024-11-02 12:24:59,160 INFO  L153        SettingsManager]:  * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain
[2024-11-02 12:24:59,162 INFO  L153        SettingsManager]:  * Octagon Domain=false
[2024-11-02 12:24:59,163 INFO  L153        SettingsManager]:  * Abstract domain=CompoundDomain
[2024-11-02 12:24:59,163 INFO  L153        SettingsManager]:  * Check feasibility of abstract posts with an SMT solver=true
[2024-11-02 12:24:59,163 INFO  L153        SettingsManager]:  * Use the RCFG-of-the-future interface=true
[2024-11-02 12:24:59,164 INFO  L153        SettingsManager]:  * Interval Domain=false
[2024-11-02 12:24:59,164 INFO  L151        SettingsManager]: Preferences of Sifa differ from their defaults:
[2024-11-02 12:24:59,164 INFO  L153        SettingsManager]:  * Call Summarizer=TopInputCallSummarizer
[2024-11-02 12:24:59,167 INFO  L153        SettingsManager]:  * Simplification Technique=POLY_PAC
[2024-11-02 12:24:59,168 INFO  L151        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2024-11-02 12:24:59,168 INFO  L153        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2024-11-02 12:24:59,169 INFO  L153        SettingsManager]:  * sizeof long=4
[2024-11-02 12:24:59,169 INFO  L153        SettingsManager]:  * Overapproximate operations on floating types=true
[2024-11-02 12:24:59,169 INFO  L153        SettingsManager]:  * sizeof POINTER=4
[2024-11-02 12:24:59,170 INFO  L153        SettingsManager]:  * Check division by zero=IGNORE
[2024-11-02 12:24:59,170 INFO  L153        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2024-11-02 12:24:59,170 INFO  L153        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2024-11-02 12:24:59,171 INFO  L153        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2024-11-02 12:24:59,173 INFO  L153        SettingsManager]:  * Allow undefined functions=false
[2024-11-02 12:24:59,174 INFO  L153        SettingsManager]:  * sizeof long double=12
[2024-11-02 12:24:59,174 INFO  L153        SettingsManager]:  * Check if freed pointer was valid=false
[2024-11-02 12:24:59,174 INFO  L153        SettingsManager]:  * Use constant arrays=true
[2024-11-02 12:24:59,175 INFO  L151        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2024-11-02 12:24:59,176 INFO  L153        SettingsManager]:  * Only consider context switches at boundaries of atomic blocks=true
[2024-11-02 12:24:59,188 INFO  L153        SettingsManager]:  * SMT solver=External_DefaultMode
[2024-11-02 12:24:59,189 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2024-11-02 12:24:59,189 INFO  L151        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2024-11-02 12:24:59,189 INFO  L153        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2024-11-02 12:24:59,190 INFO  L153        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopHeads
[2024-11-02 12:24:59,190 INFO  L153        SettingsManager]:  * Trace refinement strategy=SIFA_TAIPAN
[2024-11-02 12:24:59,190 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2024-11-02 12:24:59,191 INFO  L153        SettingsManager]:  * Apply one-shot large block encoding in concurrent analysis=false
[2024-11-02 12:24:59,191 INFO  L153        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2024-11-02 12:24:59,191 INFO  L153        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
[2024-11-02 12:24:59,191 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_f2f34c16-a953-4ccd-81de-907433ff28d2/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_f2f34c16-a953-4ccd-81de-907433ff28d2/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 -> 205f0e0aff0d53187144e7eaaf7c9176a7ca6bc04dd0065235effeefd306421c
[2024-11-02 12:24:59,520 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2024-11-02 12:24:59,557 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2024-11-02 12:24:59,560 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2024-11-02 12:24:59,562 INFO  L270        PluginConnector]: Initializing CDTParser...
[2024-11-02 12:24:59,563 INFO  L274        PluginConnector]: CDTParser initialized
[2024-11-02 12:24:59,564 INFO  L431   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2f34c16-a953-4ccd-81de-907433ff28d2/bin/utaipan-verify-DbMuA5NWw2/../../sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.4.ufo.UNBOUNDED.pals.c
Unable to find full path for "g++"
[2024-11-02 12:25:01,521 INFO  L533              CDTParser]: Created temporary CDT project at NULL
[2024-11-02 12:25:01,821 INFO  L384              CDTParser]: Found 1 translation units.
[2024-11-02 12:25:01,823 INFO  L180              CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2f34c16-a953-4ccd-81de-907433ff28d2/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.4.ufo.UNBOUNDED.pals.c
[2024-11-02 12:25:01,835 INFO  L427              CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2f34c16-a953-4ccd-81de-907433ff28d2/bin/utaipan-verify-DbMuA5NWw2/data/02e606b34/3a0cb5a9fdea415a9202dadd7447ea6e/FLAGd04fecc67
[2024-11-02 12:25:01,851 INFO  L435              CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2f34c16-a953-4ccd-81de-907433ff28d2/bin/utaipan-verify-DbMuA5NWw2/data/02e606b34/3a0cb5a9fdea415a9202dadd7447ea6e
[2024-11-02 12:25:01,854 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2024-11-02 12:25:01,855 INFO  L133        ToolchainWalker]: Walking toolchain with 6 elements.
[2024-11-02 12:25:01,857 INFO  L112        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2024-11-02 12:25:01,857 INFO  L270        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2024-11-02 12:25:01,864 INFO  L274        PluginConnector]: CACSL2BoogieTranslator initialized
[2024-11-02 12:25:01,865 INFO  L184        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 12:25:01" (1/1) ...
[2024-11-02 12:25:01,867 INFO  L204        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4682fb21 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:25:01, skipping insertion in model container
[2024-11-02 12:25:01,867 INFO  L184        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 12:25:01" (1/1) ...
[2024-11-02 12:25:01,920 INFO  L175         MainTranslator]: Built tables and reachable declarations
[2024-11-02 12:25:02,274 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_f2f34c16-a953-4ccd-81de-907433ff28d2/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.4.ufo.UNBOUNDED.pals.c[14511,14524]
[2024-11-02 12:25:02,281 INFO  L210          PostProcessor]: Analyzing one entry point: main
[2024-11-02 12:25:02,297 INFO  L200         MainTranslator]: Completed pre-run
[2024-11-02 12:25:02,374 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_f2f34c16-a953-4ccd-81de-907433ff28d2/sv-benchmarks/c/seq-mthreaded/pals_opt-floodmax.3.4.ufo.UNBOUNDED.pals.c[14511,14524]
[2024-11-02 12:25:02,375 INFO  L210          PostProcessor]: Analyzing one entry point: main
[2024-11-02 12:25:02,408 INFO  L204         MainTranslator]: Completed translation
[2024-11-02 12:25:02,408 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:25:02 WrapperNode
[2024-11-02 12:25:02,408 INFO  L131        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2024-11-02 12:25:02,409 INFO  L112        PluginConnector]: ------------------------Boogie Procedure Inliner----------------------------
[2024-11-02 12:25:02,409 INFO  L270        PluginConnector]: Initializing Boogie Procedure Inliner...
[2024-11-02 12:25:02,409 INFO  L274        PluginConnector]: Boogie Procedure Inliner initialized
[2024-11-02 12:25:02,417 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:25:02" (1/1) ...
[2024-11-02 12:25:02,428 INFO  L184        PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:25:02" (1/1) ...
[2024-11-02 12:25:02,477 INFO  L138                Inliner]: procedures = 23, calls = 14, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 496
[2024-11-02 12:25:02,477 INFO  L131        PluginConnector]: ------------------------ END Boogie Procedure Inliner----------------------------
[2024-11-02 12:25:02,478 INFO  L112        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2024-11-02 12:25:02,478 INFO  L270        PluginConnector]: Initializing Boogie Preprocessor...
[2024-11-02 12:25:02,478 INFO  L274        PluginConnector]: Boogie Preprocessor initialized
[2024-11-02 12:25:02,488 INFO  L184        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:25:02" (1/1) ...
[2024-11-02 12:25:02,488 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:25:02" (1/1) ...
[2024-11-02 12:25:02,493 INFO  L184        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:25:02" (1/1) ...
[2024-11-02 12:25:02,493 INFO  L184        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:25:02" (1/1) ...
[2024-11-02 12:25:02,504 INFO  L184        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:25:02" (1/1) ...
[2024-11-02 12:25:02,515 INFO  L184        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:25:02" (1/1) ...
[2024-11-02 12:25:02,520 INFO  L184        PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:25:02" (1/1) ...
[2024-11-02 12:25:02,523 INFO  L184        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:25:02" (1/1) ...
[2024-11-02 12:25:02,531 INFO  L131        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2024-11-02 12:25:02,532 INFO  L112        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2024-11-02 12:25:02,533 INFO  L270        PluginConnector]: Initializing RCFGBuilder...
[2024-11-02 12:25:02,533 INFO  L274        PluginConnector]: RCFGBuilder initialized
[2024-11-02 12:25:02,535 INFO  L184        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:25:02" (1/1) ...
[2024-11-02 12:25:02,547 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2024-11-02 12:25:02,560 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2f34c16-a953-4ccd-81de-907433ff28d2/bin/utaipan-verify-DbMuA5NWw2/z3
[2024-11-02 12:25:02,578 INFO  L229       MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2f34c16-a953-4ccd-81de-907433ff28d2/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
[2024-11-02 12:25:02,586 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2f34c16-a953-4ccd-81de-907433ff28d2/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process
[2024-11-02 12:25:02,622 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit
[2024-11-02 12:25:02,622 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int
[2024-11-02 12:25:02,622 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2024-11-02 12:25:02,624 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2024-11-02 12:25:02,763 INFO  L238             CfgBuilder]: Building ICFG
[2024-11-02 12:25:02,765 INFO  L264             CfgBuilder]: Building CFG for each procedure with an implementation
[2024-11-02 12:25:03,563 INFO  L?                        ?]: Removed 48 outVars from TransFormulas that were not future-live.
[2024-11-02 12:25:03,563 INFO  L287             CfgBuilder]: Performing block encoding
[2024-11-02 12:25:04,501 INFO  L311             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2024-11-02 12:25:04,501 INFO  L316             CfgBuilder]: Removed 1 assume(true) statements.
[2024-11-02 12:25:04,501 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 12:25:04 BoogieIcfgContainer
[2024-11-02 12:25:04,502 INFO  L131        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2024-11-02 12:25:04,504 INFO  L112        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2024-11-02 12:25:04,505 INFO  L270        PluginConnector]: Initializing TraceAbstraction...
[2024-11-02 12:25:04,509 INFO  L274        PluginConnector]: TraceAbstraction initialized
[2024-11-02 12:25:04,509 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 12:25:01" (1/3) ...
[2024-11-02 12:25:04,510 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30d3de30 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 12:25:04, skipping insertion in model container
[2024-11-02 12:25:04,511 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:25:02" (2/3) ...
[2024-11-02 12:25:04,512 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30d3de30 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 12:25:04, skipping insertion in model container
[2024-11-02 12:25:04,512 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 12:25:04" (3/3) ...
[2024-11-02 12:25:04,513 INFO  L112   eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.3.4.ufo.UNBOUNDED.pals.c
[2024-11-02 12:25:04,534 INFO  L214   ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2024-11-02 12:25:04,535 INFO  L154   ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations.
[2024-11-02 12:25:04,611 INFO  L332      AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ========
[2024-11-02 12:25:04,619 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;@4366088d, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms]
[2024-11-02 12:25:04,620 INFO  L334      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2024-11-02 12:25:04,625 INFO  L276                IsEmpty]: Start isEmpty. Operand  has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 18 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:04,631 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 7
[2024-11-02 12:25:04,632 INFO  L207           NwaCegarLoop]: Found error trace
[2024-11-02 12:25:04,632 INFO  L215           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1]
[2024-11-02 12:25:04,633 INFO  L396      AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2024-11-02 12:25:04,638 INFO  L157       PredicateUnifier]: Initialized classic predicate unifier
[2024-11-02 12:25:04,639 INFO  L85        PathProgramCache]: Analyzing trace with hash 527512674, now seen corresponding path program 1 times
[2024-11-02 12:25:04,650 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2024-11-02 12:25:04,651 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136196029]
[2024-11-02 12:25:04,651 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:25:04,652 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2024-11-02 12:25:04,978 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:25:07,924 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2024-11-02 12:25:07,925 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2024-11-02 12:25:07,926 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136196029]
[2024-11-02 12:25:07,927 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136196029] provided 1 perfect and 0 imperfect interpolant sequences
[2024-11-02 12:25:07,928 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2024-11-02 12:25:07,928 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2024-11-02 12:25:07,930 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [508267847]
[2024-11-02 12:25:07,930 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2024-11-02 12:25:07,935 INFO  L548      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2024-11-02 12:25:07,937 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2024-11-02 12:25:07,962 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2024-11-02 12:25:07,963 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2024-11-02 12:25:07,966 INFO  L87              Difference]: Start difference. First operand  has 19 states, 17 states have (on average 1.7647058823529411) internal successors, (30), 18 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand  has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:08,151 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2024-11-02 12:25:08,152 INFO  L93              Difference]: Finished difference Result 54 states and 90 transitions.
[2024-11-02 12:25:08,153 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2024-11-02 12:25:08,154 INFO  L78                 Accepts]: Start accepts. Automaton has  has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6
[2024-11-02 12:25:08,155 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2024-11-02 12:25:08,164 INFO  L225             Difference]: With dead ends: 54
[2024-11-02 12:25:08,164 INFO  L226             Difference]: Without dead ends: 36
[2024-11-02 12:25:08,167 INFO  L431           NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2024-11-02 12:25:08,171 INFO  L432           NwaCegarLoop]: 15 mSDtfsCounter, 23 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time
[2024-11-02 12:25:08,172 INFO  L433           NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 39 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time]
[2024-11-02 12:25:08,191 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 36 states.
[2024-11-02 12:25:08,204 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27.
[2024-11-02 12:25:08,205 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 27 states, 26 states have (on average 1.6153846153846154) internal successors, (42), 26 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:08,206 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 42 transitions.
[2024-11-02 12:25:08,208 INFO  L78                 Accepts]: Start accepts. Automaton has 27 states and 42 transitions. Word has length 6
[2024-11-02 12:25:08,208 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2024-11-02 12:25:08,208 INFO  L471      AbstractCegarLoop]: Abstraction has 27 states and 42 transitions.
[2024-11-02 12:25:08,209 INFO  L472      AbstractCegarLoop]: INTERPOLANT automaton has  has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:08,209 INFO  L276                IsEmpty]: Start isEmpty. Operand 27 states and 42 transitions.
[2024-11-02 12:25:08,209 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 8
[2024-11-02 12:25:08,210 INFO  L207           NwaCegarLoop]: Found error trace
[2024-11-02 12:25:08,210 INFO  L215           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1]
[2024-11-02 12:25:08,210 WARN  L453      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2024-11-02 12:25:08,210 INFO  L396      AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2024-11-02 12:25:08,211 INFO  L157       PredicateUnifier]: Initialized classic predicate unifier
[2024-11-02 12:25:08,211 INFO  L85        PathProgramCache]: Analyzing trace with hash -889697299, now seen corresponding path program 1 times
[2024-11-02 12:25:08,211 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2024-11-02 12:25:08,212 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [571525073]
[2024-11-02 12:25:08,212 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:25:08,212 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2024-11-02 12:25:08,263 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:25:09,799 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2024-11-02 12:25:09,800 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2024-11-02 12:25:09,801 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [571525073]
[2024-11-02 12:25:09,801 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [571525073] provided 1 perfect and 0 imperfect interpolant sequences
[2024-11-02 12:25:09,801 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2024-11-02 12:25:09,802 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2024-11-02 12:25:09,802 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1514020200]
[2024-11-02 12:25:09,802 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2024-11-02 12:25:09,803 INFO  L548      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2024-11-02 12:25:09,804 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2024-11-02 12:25:09,805 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2024-11-02 12:25:09,805 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2024-11-02 12:25:09,806 INFO  L87              Difference]: Start difference. First operand 27 states and 42 transitions. Second operand  has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:09,930 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2024-11-02 12:25:09,931 INFO  L93              Difference]: Finished difference Result 53 states and 80 transitions.
[2024-11-02 12:25:09,932 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2024-11-02 12:25:09,932 INFO  L78                 Accepts]: Start accepts. Automaton has  has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7
[2024-11-02 12:25:09,932 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2024-11-02 12:25:09,934 INFO  L225             Difference]: With dead ends: 53
[2024-11-02 12:25:09,935 INFO  L226             Difference]: Without dead ends: 36
[2024-11-02 12:25:09,935 INFO  L431           NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2024-11-02 12:25:09,937 INFO  L432           NwaCegarLoop]: 18 mSDtfsCounter, 21 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2024-11-02 12:25:09,938 INFO  L433           NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 46 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2024-11-02 12:25:09,940 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 36 states.
[2024-11-02 12:25:09,944 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27.
[2024-11-02 12:25:09,945 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 27 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 26 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:09,946 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 41 transitions.
[2024-11-02 12:25:09,946 INFO  L78                 Accepts]: Start accepts. Automaton has 27 states and 41 transitions. Word has length 7
[2024-11-02 12:25:09,946 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2024-11-02 12:25:09,947 INFO  L471      AbstractCegarLoop]: Abstraction has 27 states and 41 transitions.
[2024-11-02 12:25:09,947 INFO  L472      AbstractCegarLoop]: INTERPOLANT automaton has  has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:09,947 INFO  L276                IsEmpty]: Start isEmpty. Operand 27 states and 41 transitions.
[2024-11-02 12:25:09,947 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 9
[2024-11-02 12:25:09,948 INFO  L207           NwaCegarLoop]: Found error trace
[2024-11-02 12:25:09,948 INFO  L215           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1]
[2024-11-02 12:25:09,948 WARN  L453      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2024-11-02 12:25:09,948 INFO  L396      AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2024-11-02 12:25:09,949 INFO  L157       PredicateUnifier]: Initialized classic predicate unifier
[2024-11-02 12:25:09,949 INFO  L85        PathProgramCache]: Analyzing trace with hash -1868081749, now seen corresponding path program 1 times
[2024-11-02 12:25:09,949 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2024-11-02 12:25:09,949 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2132537668]
[2024-11-02 12:25:09,949 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:25:09,949 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2024-11-02 12:25:10,011 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:25:11,228 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2024-11-02 12:25:11,229 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2024-11-02 12:25:11,229 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2132537668]
[2024-11-02 12:25:11,230 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2132537668] provided 1 perfect and 0 imperfect interpolant sequences
[2024-11-02 12:25:11,230 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2024-11-02 12:25:11,231 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2024-11-02 12:25:11,231 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1659266900]
[2024-11-02 12:25:11,232 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2024-11-02 12:25:11,232 INFO  L548      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2024-11-02 12:25:11,232 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2024-11-02 12:25:11,233 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2024-11-02 12:25:11,233 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2024-11-02 12:25:11,233 INFO  L87              Difference]: Start difference. First operand 27 states and 41 transitions. Second operand  has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:11,367 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2024-11-02 12:25:11,367 INFO  L93              Difference]: Finished difference Result 53 states and 79 transitions.
[2024-11-02 12:25:11,368 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2024-11-02 12:25:11,368 INFO  L78                 Accepts]: Start accepts. Automaton has  has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8
[2024-11-02 12:25:11,368 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2024-11-02 12:25:11,369 INFO  L225             Difference]: With dead ends: 53
[2024-11-02 12:25:11,370 INFO  L226             Difference]: Without dead ends: 36
[2024-11-02 12:25:11,371 INFO  L431           NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2024-11-02 12:25:11,373 INFO  L432           NwaCegarLoop]: 18 mSDtfsCounter, 19 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2024-11-02 12:25:11,375 INFO  L433           NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 45 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2024-11-02 12:25:11,376 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 36 states.
[2024-11-02 12:25:11,382 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27.
[2024-11-02 12:25:11,383 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 27 states, 26 states have (on average 1.5384615384615385) internal successors, (40), 26 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:11,384 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 40 transitions.
[2024-11-02 12:25:11,384 INFO  L78                 Accepts]: Start accepts. Automaton has 27 states and 40 transitions. Word has length 8
[2024-11-02 12:25:11,386 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2024-11-02 12:25:11,386 INFO  L471      AbstractCegarLoop]: Abstraction has 27 states and 40 transitions.
[2024-11-02 12:25:11,386 INFO  L472      AbstractCegarLoop]: INTERPOLANT automaton has  has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:11,387 INFO  L276                IsEmpty]: Start isEmpty. Operand 27 states and 40 transitions.
[2024-11-02 12:25:11,387 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 10
[2024-11-02 12:25:11,387 INFO  L207           NwaCegarLoop]: Found error trace
[2024-11-02 12:25:11,387 INFO  L215           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1]
[2024-11-02 12:25:11,388 WARN  L453      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2024-11-02 12:25:11,389 INFO  L396      AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2024-11-02 12:25:11,389 INFO  L157       PredicateUnifier]: Initialized classic predicate unifier
[2024-11-02 12:25:11,389 INFO  L85        PathProgramCache]: Analyzing trace with hash -2127776874, now seen corresponding path program 1 times
[2024-11-02 12:25:11,390 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2024-11-02 12:25:11,391 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112970872]
[2024-11-02 12:25:11,391 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:25:11,391 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2024-11-02 12:25:11,440 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:25:12,791 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2024-11-02 12:25:12,792 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2024-11-02 12:25:12,792 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112970872]
[2024-11-02 12:25:12,792 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112970872] provided 1 perfect and 0 imperfect interpolant sequences
[2024-11-02 12:25:12,793 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2024-11-02 12:25:12,793 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2024-11-02 12:25:12,793 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278026991]
[2024-11-02 12:25:12,793 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2024-11-02 12:25:12,794 INFO  L548      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2024-11-02 12:25:12,794 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2024-11-02 12:25:12,795 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2024-11-02 12:25:12,795 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2024-11-02 12:25:12,795 INFO  L87              Difference]: Start difference. First operand 27 states and 40 transitions. Second operand  has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:12,928 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2024-11-02 12:25:12,929 INFO  L93              Difference]: Finished difference Result 53 states and 78 transitions.
[2024-11-02 12:25:12,929 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2024-11-02 12:25:12,930 INFO  L78                 Accepts]: Start accepts. Automaton has  has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9
[2024-11-02 12:25:12,930 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2024-11-02 12:25:12,930 INFO  L225             Difference]: With dead ends: 53
[2024-11-02 12:25:12,932 INFO  L226             Difference]: Without dead ends: 36
[2024-11-02 12:25:12,933 INFO  L431           NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2024-11-02 12:25:12,934 INFO  L432           NwaCegarLoop]: 18 mSDtfsCounter, 17 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2024-11-02 12:25:12,937 INFO  L433           NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 46 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2024-11-02 12:25:12,938 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 36 states.
[2024-11-02 12:25:12,943 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 27.
[2024-11-02 12:25:12,945 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 27 states, 26 states have (on average 1.5) internal successors, (39), 26 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:12,946 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 39 transitions.
[2024-11-02 12:25:12,946 INFO  L78                 Accepts]: Start accepts. Automaton has 27 states and 39 transitions. Word has length 9
[2024-11-02 12:25:12,947 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2024-11-02 12:25:12,947 INFO  L471      AbstractCegarLoop]: Abstraction has 27 states and 39 transitions.
[2024-11-02 12:25:12,947 INFO  L472      AbstractCegarLoop]: INTERPOLANT automaton has  has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:12,947 INFO  L276                IsEmpty]: Start isEmpty. Operand 27 states and 39 transitions.
[2024-11-02 12:25:12,948 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 13
[2024-11-02 12:25:12,948 INFO  L207           NwaCegarLoop]: Found error trace
[2024-11-02 12:25:12,948 INFO  L215           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2024-11-02 12:25:12,948 WARN  L453      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2024-11-02 12:25:12,949 INFO  L396      AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2024-11-02 12:25:12,949 INFO  L157       PredicateUnifier]: Initialized classic predicate unifier
[2024-11-02 12:25:12,950 INFO  L85        PathProgramCache]: Analyzing trace with hash -2082663070, now seen corresponding path program 1 times
[2024-11-02 12:25:12,950 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2024-11-02 12:25:12,950 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073006755]
[2024-11-02 12:25:12,951 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:25:12,951 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2024-11-02 12:25:13,130 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:25:14,457 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2024-11-02 12:25:14,457 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2024-11-02 12:25:14,458 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073006755]
[2024-11-02 12:25:14,458 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2073006755] provided 1 perfect and 0 imperfect interpolant sequences
[2024-11-02 12:25:14,458 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2024-11-02 12:25:14,458 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2024-11-02 12:25:14,459 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442569520]
[2024-11-02 12:25:14,459 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2024-11-02 12:25:14,461 INFO  L548      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2024-11-02 12:25:14,461 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2024-11-02 12:25:14,462 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2024-11-02 12:25:14,462 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2024-11-02 12:25:14,462 INFO  L87              Difference]: Start difference. First operand 27 states and 39 transitions. Second operand  has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:14,568 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2024-11-02 12:25:14,569 INFO  L93              Difference]: Finished difference Result 54 states and 79 transitions.
[2024-11-02 12:25:14,569 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2024-11-02 12:25:14,569 INFO  L78                 Accepts]: Start accepts. Automaton has  has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12
[2024-11-02 12:25:14,570 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2024-11-02 12:25:14,570 INFO  L225             Difference]: With dead ends: 54
[2024-11-02 12:25:14,570 INFO  L226             Difference]: Without dead ends: 35
[2024-11-02 12:25:14,571 INFO  L431           NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2024-11-02 12:25:14,573 INFO  L432           NwaCegarLoop]: 21 mSDtfsCounter, 12 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2024-11-02 12:25:14,574 INFO  L433           NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 57 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2024-11-02 12:25:14,574 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 35 states.
[2024-11-02 12:25:14,577 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 27.
[2024-11-02 12:25:14,578 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:14,578 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 37 transitions.
[2024-11-02 12:25:14,579 INFO  L78                 Accepts]: Start accepts. Automaton has 27 states and 37 transitions. Word has length 12
[2024-11-02 12:25:14,579 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2024-11-02 12:25:14,579 INFO  L471      AbstractCegarLoop]: Abstraction has 27 states and 37 transitions.
[2024-11-02 12:25:14,579 INFO  L472      AbstractCegarLoop]: INTERPOLANT automaton has  has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:14,580 INFO  L276                IsEmpty]: Start isEmpty. Operand 27 states and 37 transitions.
[2024-11-02 12:25:14,580 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 15
[2024-11-02 12:25:14,580 INFO  L207           NwaCegarLoop]: Found error trace
[2024-11-02 12:25:14,580 INFO  L215           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2024-11-02 12:25:14,581 WARN  L453      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2024-11-02 12:25:14,581 INFO  L396      AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2024-11-02 12:25:14,581 INFO  L157       PredicateUnifier]: Initialized classic predicate unifier
[2024-11-02 12:25:14,581 INFO  L85        PathProgramCache]: Analyzing trace with hash 1526569064, now seen corresponding path program 1 times
[2024-11-02 12:25:14,582 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2024-11-02 12:25:14,582 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1577278103]
[2024-11-02 12:25:14,582 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:25:14,582 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2024-11-02 12:25:14,762 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:25:16,307 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2024-11-02 12:25:16,307 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2024-11-02 12:25:16,307 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1577278103]
[2024-11-02 12:25:16,308 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1577278103] provided 1 perfect and 0 imperfect interpolant sequences
[2024-11-02 12:25:16,308 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2024-11-02 12:25:16,308 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2024-11-02 12:25:16,308 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911570815]
[2024-11-02 12:25:16,308 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2024-11-02 12:25:16,308 INFO  L548      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2024-11-02 12:25:16,309 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2024-11-02 12:25:16,309 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2024-11-02 12:25:16,309 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2024-11-02 12:25:16,309 INFO  L87              Difference]: Start difference. First operand 27 states and 37 transitions. Second operand  has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:16,406 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2024-11-02 12:25:16,407 INFO  L93              Difference]: Finished difference Result 52 states and 73 transitions.
[2024-11-02 12:25:16,409 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2024-11-02 12:25:16,410 INFO  L78                 Accepts]: Start accepts. Automaton has  has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14
[2024-11-02 12:25:16,410 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2024-11-02 12:25:16,410 INFO  L225             Difference]: With dead ends: 52
[2024-11-02 12:25:16,410 INFO  L226             Difference]: Without dead ends: 35
[2024-11-02 12:25:16,411 INFO  L431           NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2024-11-02 12:25:16,411 INFO  L432           NwaCegarLoop]: 20 mSDtfsCounter, 7 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2024-11-02 12:25:16,412 INFO  L433           NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 52 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2024-11-02 12:25:16,412 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 35 states.
[2024-11-02 12:25:16,417 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 28.
[2024-11-02 12:25:16,420 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 28 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 27 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:16,421 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions.
[2024-11-02 12:25:16,421 INFO  L78                 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 14
[2024-11-02 12:25:16,421 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2024-11-02 12:25:16,422 INFO  L471      AbstractCegarLoop]: Abstraction has 28 states and 38 transitions.
[2024-11-02 12:25:16,422 INFO  L472      AbstractCegarLoop]: INTERPOLANT automaton has  has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:16,423 INFO  L276                IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions.
[2024-11-02 12:25:16,423 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 16
[2024-11-02 12:25:16,423 INFO  L207           NwaCegarLoop]: Found error trace
[2024-11-02 12:25:16,423 INFO  L215           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2024-11-02 12:25:16,424 WARN  L453      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2024-11-02 12:25:16,424 INFO  L396      AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2024-11-02 12:25:16,425 INFO  L157       PredicateUnifier]: Initialized classic predicate unifier
[2024-11-02 12:25:16,425 INFO  L85        PathProgramCache]: Analyzing trace with hash 67788358, now seen corresponding path program 1 times
[2024-11-02 12:25:16,425 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2024-11-02 12:25:16,425 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [796226832]
[2024-11-02 12:25:16,426 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:25:16,426 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2024-11-02 12:25:16,480 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:25:17,813 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2024-11-02 12:25:17,814 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2024-11-02 12:25:17,814 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [796226832]
[2024-11-02 12:25:17,814 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [796226832] provided 1 perfect and 0 imperfect interpolant sequences
[2024-11-02 12:25:17,815 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2024-11-02 12:25:17,815 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2024-11-02 12:25:17,815 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [832611634]
[2024-11-02 12:25:17,815 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2024-11-02 12:25:17,816 INFO  L548      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2024-11-02 12:25:17,816 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2024-11-02 12:25:17,817 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2024-11-02 12:25:17,818 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2024-11-02 12:25:17,819 INFO  L87              Difference]: Start difference. First operand 28 states and 38 transitions. Second operand  has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:17,974 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2024-11-02 12:25:17,974 INFO  L93              Difference]: Finished difference Result 56 states and 79 transitions.
[2024-11-02 12:25:17,975 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2024-11-02 12:25:17,975 INFO  L78                 Accepts]: Start accepts. Automaton has  has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15
[2024-11-02 12:25:17,975 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2024-11-02 12:25:17,976 INFO  L225             Difference]: With dead ends: 56
[2024-11-02 12:25:17,976 INFO  L226             Difference]: Without dead ends: 39
[2024-11-02 12:25:17,976 INFO  L431           NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42
[2024-11-02 12:25:17,977 INFO  L432           NwaCegarLoop]: 23 mSDtfsCounter, 10 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2024-11-02 12:25:17,978 INFO  L433           NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 73 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2024-11-02 12:25:17,978 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 39 states.
[2024-11-02 12:25:17,981 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 33.
[2024-11-02 12:25:17,982 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 33 states, 32 states have (on average 1.34375) internal successors, (43), 32 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:17,982 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 43 transitions.
[2024-11-02 12:25:17,983 INFO  L78                 Accepts]: Start accepts. Automaton has 33 states and 43 transitions. Word has length 15
[2024-11-02 12:25:17,983 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2024-11-02 12:25:17,983 INFO  L471      AbstractCegarLoop]: Abstraction has 33 states and 43 transitions.
[2024-11-02 12:25:17,983 INFO  L472      AbstractCegarLoop]: INTERPOLANT automaton has  has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2024-11-02 12:25:17,983 INFO  L276                IsEmpty]: Start isEmpty. Operand 33 states and 43 transitions.
[2024-11-02 12:25:17,986 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 21
[2024-11-02 12:25:17,987 INFO  L207           NwaCegarLoop]: Found error trace
[2024-11-02 12:25:17,987 INFO  L215           NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2024-11-02 12:25:17,988 WARN  L453      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6
[2024-11-02 12:25:17,989 INFO  L396      AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2024-11-02 12:25:17,989 INFO  L157       PredicateUnifier]: Initialized classic predicate unifier
[2024-11-02 12:25:17,990 INFO  L85        PathProgramCache]: Analyzing trace with hash 260664120, now seen corresponding path program 1 times
[2024-11-02 12:25:17,990 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2024-11-02 12:25:17,990 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2062474067]
[2024-11-02 12:25:17,990 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:25:17,990 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2024-11-02 12:25:18,404 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:25:21,478 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2024-11-02 12:25:21,478 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2024-11-02 12:25:21,478 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2062474067]
[2024-11-02 12:25:21,478 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2062474067] provided 0 perfect and 1 imperfect interpolant sequences
[2024-11-02 12:25:21,479 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [62303206]
[2024-11-02 12:25:21,479 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2024-11-02 12:25:21,479 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2024-11-02 12:25:21,479 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2f34c16-a953-4ccd-81de-907433ff28d2/bin/utaipan-verify-DbMuA5NWw2/z3
[2024-11-02 12:25:21,482 INFO  L229       MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2f34c16-a953-4ccd-81de-907433ff28d2/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2024-11-02 12:25:21,483 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f2f34c16-a953-4ccd-81de-907433ff28d2/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process
[2024-11-02 12:25:21,765 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2024-11-02 12:25:21,771 INFO  L255         TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 15 conjuncts are in the unsatisfiable core
[2024-11-02 12:25:21,800 INFO  L278         TraceCheckSpWp]: Computing forward predicates...