./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/neural-networks/lunarlander_76_unsafe.c-amalgamation.i --full-output --architecture 32bit


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


Checking for ERROR reachability
Using default analysis
Version 30e01a73
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_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/neural-networks/lunarlander_76_unsafe.c-amalgamation.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire --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 0003d2fcbff772392c004fecdb84e624cfefc3dc7935cdf9f8d951c45f39b7b3
--- Real Ultimate output ---
This is Ultimate 0.2.3-dev-30e01a7
[2023-11-23 21:08:16,173 INFO  L188        SettingsManager]: Resetting all preferences to default values...
[2023-11-23 21:08:16,322 INFO  L114        SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf
[2023-11-23 21:08:16,333 WARN  L101        SettingsManager]: Preference file contains the following unknown settings:
[2023-11-23 21:08:16,334 WARN  L103        SettingsManager]:   * de.uni_freiburg.informatik.ultimate.core.Log level for class
[2023-11-23 21:08:16,373 INFO  L130        SettingsManager]: Preferences different from defaults after loading the file:
[2023-11-23 21:08:16,374 INFO  L151        SettingsManager]: Preferences of UltimateCore differ from their defaults:
[2023-11-23 21:08:16,375 INFO  L153        SettingsManager]:  * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR;
[2023-11-23 21:08:16,376 INFO  L151        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2023-11-23 21:08:16,381 INFO  L153        SettingsManager]:  * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS
[2023-11-23 21:08:16,381 INFO  L153        SettingsManager]:  * User list type=DISABLED
[2023-11-23 21:08:16,382 INFO  L151        SettingsManager]: Preferences of Abstract Interpretation differ from their defaults:
[2023-11-23 21:08:16,383 INFO  L153        SettingsManager]:  * Explicit value domain=true
[2023-11-23 21:08:16,384 INFO  L153        SettingsManager]:  * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain
[2023-11-23 21:08:16,385 INFO  L153        SettingsManager]:  * Octagon Domain=false
[2023-11-23 21:08:16,385 INFO  L153        SettingsManager]:  * Abstract domain=CompoundDomain
[2023-11-23 21:08:16,386 INFO  L153        SettingsManager]:  * Check feasibility of abstract posts with an SMT solver=true
[2023-11-23 21:08:16,386 INFO  L153        SettingsManager]:  * Use the RCFG-of-the-future interface=true
[2023-11-23 21:08:16,387 INFO  L153        SettingsManager]:  * Interval Domain=false
[2023-11-23 21:08:16,387 INFO  L151        SettingsManager]: Preferences of Sifa differ from their defaults:
[2023-11-23 21:08:16,388 INFO  L153        SettingsManager]:  * Call Summarizer=TopInputCallSummarizer
[2023-11-23 21:08:16,388 INFO  L153        SettingsManager]:  * Simplification Technique=POLY_PAC
[2023-11-23 21:08:16,390 INFO  L151        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2023-11-23 21:08:16,390 INFO  L153        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2023-11-23 21:08:16,391 INFO  L153        SettingsManager]:  * sizeof long=4
[2023-11-23 21:08:16,391 INFO  L153        SettingsManager]:  * Overapproximate operations on floating types=true
[2023-11-23 21:08:16,392 INFO  L153        SettingsManager]:  * sizeof POINTER=4
[2023-11-23 21:08:16,392 INFO  L153        SettingsManager]:  * Check division by zero=IGNORE
[2023-11-23 21:08:16,392 INFO  L153        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2023-11-23 21:08:16,393 INFO  L153        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2023-11-23 21:08:16,394 INFO  L153        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2023-11-23 21:08:16,395 INFO  L153        SettingsManager]:  * sizeof long double=12
[2023-11-23 21:08:16,395 INFO  L153        SettingsManager]:  * Check if freed pointer was valid=false
[2023-11-23 21:08:16,395 INFO  L153        SettingsManager]:  * Use constant arrays=true
[2023-11-23 21:08:16,396 INFO  L151        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2023-11-23 21:08:16,396 INFO  L153        SettingsManager]:  * Only consider context switches at boundaries of atomic blocks=true
[2023-11-23 21:08:16,396 INFO  L153        SettingsManager]:  * SMT solver=External_DefaultMode
[2023-11-23 21:08:16,397 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2023-11-23 21:08:16,397 INFO  L151        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2023-11-23 21:08:16,397 INFO  L153        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2023-11-23 21:08:16,398 INFO  L153        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopHeads
[2023-11-23 21:08:16,398 INFO  L153        SettingsManager]:  * Trace refinement strategy=SIFA_TAIPAN
[2023-11-23 21:08:16,398 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2023-11-23 21:08:16,399 INFO  L153        SettingsManager]:  * Apply one-shot large block encoding in concurrent analysis=false
[2023-11-23 21:08:16,399 INFO  L153        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2023-11-23 21:08:16,399 INFO  L153        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2023-11-23 21:08:16,400 INFO  L153        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
[2023-11-23 21:08:16,400 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_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/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_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire
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 -> 0003d2fcbff772392c004fecdb84e624cfefc3dc7935cdf9f8d951c45f39b7b3
[2023-11-23 21:08:16,682 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2023-11-23 21:08:16,702 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2023-11-23 21:08:16,705 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2023-11-23 21:08:16,706 INFO  L270        PluginConnector]: Initializing CDTParser...
[2023-11-23 21:08:16,707 INFO  L274        PluginConnector]: CDTParser initialized
[2023-11-23 21:08:16,708 INFO  L431   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/neural-networks/lunarlander_76_unsafe.c-amalgamation.i
[2023-11-23 21:08:19,782 INFO  L533              CDTParser]: Created temporary CDT project at NULL
[2023-11-23 21:08:20,262 INFO  L384              CDTParser]: Found 1 translation units.
[2023-11-23 21:08:20,263 INFO  L180              CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/sv-benchmarks/c/neural-networks/lunarlander_76_unsafe.c-amalgamation.i
[2023-11-23 21:08:20,310 INFO  L427              CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/data/74ddb3f0e/5af69fd0e8244d698e885b3f1bd74e7b/FLAG1d086789f
[2023-11-23 21:08:20,392 INFO  L435              CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/data/74ddb3f0e/5af69fd0e8244d698e885b3f1bd74e7b
[2023-11-23 21:08:20,395 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2023-11-23 21:08:20,396 INFO  L133        ToolchainWalker]: Walking toolchain with 6 elements.
[2023-11-23 21:08:20,401 INFO  L112        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2023-11-23 21:08:20,401 INFO  L270        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2023-11-23 21:08:20,408 INFO  L274        PluginConnector]: CACSL2BoogieTranslator initialized
[2023-11-23 21:08:20,409 INFO  L184        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:08:20" (1/1) ...
[2023-11-23 21:08:20,410 INFO  L204        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19de73fb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:20, skipping insertion in model container
[2023-11-23 21:08:20,410 INFO  L184        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:08:20" (1/1) ...
[2023-11-23 21:08:20,522 INFO  L177         MainTranslator]: Built tables and reachable declarations
[2023-11-23 21:08:20,794 WARN  L635        FunctionHandler]: implicit declaration of function __builtin_bswap16
[2023-11-23 21:08:21,402 WARN  L240   ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/sv-benchmarks/c/neural-networks/lunarlander_76_unsafe.c-amalgamation.i[64324,64337]
[2023-11-23 21:08:21,615 INFO  L209          PostProcessor]: Analyzing one entry point: main
[2023-11-23 21:08:21,785 INFO  L202         MainTranslator]: Completed pre-run
[2023-11-23 21:08:21,810 WARN  L635        FunctionHandler]: implicit declaration of function __builtin_bswap16
[2023-11-23 21:08:21,850 WARN  L240   ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/sv-benchmarks/c/neural-networks/lunarlander_76_unsafe.c-amalgamation.i[64324,64337]
[2023-11-23 21:08:21,962 INFO  L209          PostProcessor]: Analyzing one entry point: main
[2023-11-23 21:08:22,468 WARN  L675               CHandler]: The function __builtin_bswap16 is called, but not defined or handled by StandardFunctionHandler.
[2023-11-23 21:08:22,475 INFO  L206         MainTranslator]: Completed translation
[2023-11-23 21:08:22,475 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:22 WrapperNode
[2023-11-23 21:08:22,475 INFO  L131        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2023-11-23 21:08:22,476 INFO  L112        PluginConnector]: ------------------------Boogie Procedure Inliner----------------------------
[2023-11-23 21:08:22,476 INFO  L270        PluginConnector]: Initializing Boogie Procedure Inliner...
[2023-11-23 21:08:22,476 INFO  L274        PluginConnector]: Boogie Procedure Inliner initialized
[2023-11-23 21:08:22,481 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:22" (1/1) ...
[2023-11-23 21:08:22,593 INFO  L184        PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:22" (1/1) ...
[2023-11-23 21:08:22,827 INFO  L138                Inliner]: procedures = 621, calls = 5149, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 5469
[2023-11-23 21:08:22,827 INFO  L131        PluginConnector]: ------------------------ END Boogie Procedure Inliner----------------------------
[2023-11-23 21:08:22,828 INFO  L112        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2023-11-23 21:08:22,828 INFO  L270        PluginConnector]: Initializing Boogie Preprocessor...
[2023-11-23 21:08:22,828 INFO  L274        PluginConnector]: Boogie Preprocessor initialized
[2023-11-23 21:08:22,837 INFO  L184        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:22" (1/1) ...
[2023-11-23 21:08:22,838 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:22" (1/1) ...
[2023-11-23 21:08:22,888 INFO  L184        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:22" (1/1) ...
[2023-11-23 21:08:22,889 INFO  L184        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:22" (1/1) ...
[2023-11-23 21:08:23,074 INFO  L184        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:22" (1/1) ...
[2023-11-23 21:08:23,091 INFO  L184        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:22" (1/1) ...
[2023-11-23 21:08:23,175 INFO  L184        PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:22" (1/1) ...
[2023-11-23 21:08:23,191 INFO  L184        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:22" (1/1) ...
[2023-11-23 21:08:23,209 INFO  L131        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2023-11-23 21:08:23,210 INFO  L112        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2023-11-23 21:08:23,210 INFO  L270        PluginConnector]: Initializing RCFGBuilder...
[2023-11-23 21:08:23,211 INFO  L274        PluginConnector]: RCFGBuilder initialized
[2023-11-23 21:08:23,211 INFO  L184        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:22" (1/1) ...
[2023-11-23 21:08:23,217 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2023-11-23 21:08:23,228 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3
[2023-11-23 21:08:23,246 INFO  L229       MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
[2023-11-23 21:08:23,262 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process
[2023-11-23 21:08:23,291 INFO  L130     BoogieDeclarations]: Found specification of procedure read~real
[2023-11-23 21:08:23,292 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc
[2023-11-23 21:08:23,292 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~real
[2023-11-23 21:08:23,292 INFO  L130     BoogieDeclarations]: Found specification of procedure write~real
[2023-11-23 21:08:23,292 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit
[2023-11-23 21:08:23,292 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2023-11-23 21:08:23,292 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2023-11-23 21:08:23,292 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack
[2023-11-23 21:08:23,293 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int
[2023-11-23 21:08:23,525 INFO  L241             CfgBuilder]: Building ICFG
[2023-11-23 21:08:23,527 INFO  L267             CfgBuilder]: Building CFG for each procedure with an implementation
[2023-11-23 21:08:32,790 INFO  L282             CfgBuilder]: Performing block encoding
[2023-11-23 21:08:35,572 INFO  L304             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2023-11-23 21:08:35,573 INFO  L309             CfgBuilder]: Removed 12 assume(true) statements.
[2023-11-23 21:08:35,575 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:08:35 BoogieIcfgContainer
[2023-11-23 21:08:35,575 INFO  L131        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2023-11-23 21:08:35,579 INFO  L112        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2023-11-23 21:08:35,579 INFO  L270        PluginConnector]: Initializing TraceAbstraction...
[2023-11-23 21:08:35,583 INFO  L274        PluginConnector]: TraceAbstraction initialized
[2023-11-23 21:08:35,584 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:08:20" (1/3) ...
[2023-11-23 21:08:35,586 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f614c53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:08:35, skipping insertion in model container
[2023-11-23 21:08:35,587 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:22" (2/3) ...
[2023-11-23 21:08:35,587 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f614c53 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:08:35, skipping insertion in model container
[2023-11-23 21:08:35,587 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:08:35" (3/3) ...
[2023-11-23 21:08:35,589 INFO  L112   eAbstractionObserver]: Analyzing ICFG lunarlander_76_unsafe.c-amalgamation.i
[2023-11-23 21:08:35,609 INFO  L203   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2023-11-23 21:08:35,610 INFO  L162   ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations.
[2023-11-23 21:08:35,671 INFO  L356      AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ========
[2023-11-23 21:08:35,680 INFO  L357      AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@147111e4, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms]
[2023-11-23 21:08:35,681 INFO  L358      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2023-11-23 21:08:35,685 INFO  L276                IsEmpty]: Start isEmpty. Operand  has 18 states, 16 states have (on average 1.875) internal successors, (30), 17 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)
[2023-11-23 21:08:35,693 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 10
[2023-11-23 21:08:35,693 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-23 21:08:35,694 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-23 21:08:35,695 INFO  L420      AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-23 21:08:35,703 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-23 21:08:35,703 INFO  L85        PathProgramCache]: Analyzing trace with hash -1487389057, now seen corresponding path program 1 times
[2023-11-23 21:08:35,714 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-23 21:08:35,714 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1195395087]
[2023-11-23 21:08:35,715 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:08:35,715 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-23 21:08:36,780 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 21:08:38,167 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-23 21:08:38,168 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-23 21:08:38,168 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1195395087]
[2023-11-23 21:08:38,169 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1195395087] provided 1 perfect and 0 imperfect interpolant sequences
[2023-11-23 21:08:38,170 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-11-23 21:08:38,170 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2
[2023-11-23 21:08:38,172 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806870972]
[2023-11-23 21:08:38,173 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-23 21:08:38,177 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 3 states
[2023-11-23 21:08:38,178 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-23 21:08:38,220 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2023-11-23 21:08:38,220 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2023-11-23 21:08:38,222 INFO  L87              Difference]: Start difference. First operand  has 18 states, 16 states have (on average 1.875) internal successors, (30), 17 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 3 states, 3 states have (on average 3.0) internal successors, (9), 2 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)
[2023-11-23 21:08:38,668 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-23 21:08:38,668 INFO  L93              Difference]: Finished difference Result 35 states and 59 transitions.
[2023-11-23 21:08:38,670 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2023-11-23 21:08:38,671 INFO  L78                 Accepts]: Start accepts. Automaton has  has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 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
[2023-11-23 21:08:38,672 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-23 21:08:38,679 INFO  L225             Difference]: With dead ends: 35
[2023-11-23 21:08:38,680 INFO  L226             Difference]: Without dead ends: 17
[2023-11-23 21:08:38,683 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2023-11-23 21:08:38,688 INFO  L413           NwaCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time
[2023-11-23 21:08:38,689 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time]
[2023-11-23 21:08:38,706 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 17 states.
[2023-11-23 21:08:38,717 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17.
[2023-11-23 21:08:38,719 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 17 states, 16 states have (on average 1.75) internal successors, (28), 16 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-23 21:08:38,720 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 28 transitions.
[2023-11-23 21:08:38,722 INFO  L78                 Accepts]: Start accepts. Automaton has 17 states and 28 transitions. Word has length 9
[2023-11-23 21:08:38,722 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-23 21:08:38,722 INFO  L495      AbstractCegarLoop]: Abstraction has 17 states and 28 transitions.
[2023-11-23 21:08:38,723 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 3 states, 3 states have (on average 3.0) internal successors, (9), 2 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)
[2023-11-23 21:08:38,723 INFO  L276                IsEmpty]: Start isEmpty. Operand 17 states and 28 transitions.
[2023-11-23 21:08:38,724 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 11
[2023-11-23 21:08:38,724 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-23 21:08:38,724 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-23 21:08:38,724 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2023-11-23 21:08:38,725 INFO  L420      AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-23 21:08:38,726 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-23 21:08:38,726 INFO  L85        PathProgramCache]: Analyzing trace with hash -499980868, now seen corresponding path program 1 times
[2023-11-23 21:08:38,727 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-23 21:08:38,727 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1775253162]
[2023-11-23 21:08:38,727 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:08:38,727 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-23 21:08:39,356 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 21:08:40,614 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-23 21:08:40,615 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-23 21:08:40,615 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1775253162]
[2023-11-23 21:08:40,616 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1775253162] provided 0 perfect and 1 imperfect interpolant sequences
[2023-11-23 21:08:40,617 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [958404506]
[2023-11-23 21:08:40,617 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:08:40,621 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-23 21:08:40,622 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3
[2023-11-23 21:08:40,624 INFO  L229       MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-11-23 21:08:40,660 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process
[2023-11-23 21:08:42,645 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 21:08:42,690 INFO  L262         TraceCheckSpWp]: Trace formula consists of 6070 conjuncts, 6 conjunts are in the unsatisfiable core
[2023-11-23 21:08:42,703 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-11-23 21:08:42,734 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-23 21:08:42,734 INFO  L327         TraceCheckSpWp]: Computing backward predicates...
[2023-11-23 21:08:42,759 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2023-11-23 21:08:42,760 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [958404506] provided 1 perfect and 1 imperfect interpolant sequences
[2023-11-23 21:08:42,761 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences.
[2023-11-23 21:08:42,761 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 4] total 6
[2023-11-23 21:08:42,762 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566229456]
[2023-11-23 21:08:42,762 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-23 21:08:42,763 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 3 states
[2023-11-23 21:08:42,763 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-23 21:08:42,765 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2023-11-23 21:08:42,765 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2023-11-23 21:08:42,766 INFO  L87              Difference]: Start difference. First operand 17 states and 28 transitions. Second operand  has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-23 21:08:43,276 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-23 21:08:43,276 INFO  L93              Difference]: Finished difference Result 28 states and 46 transitions.
[2023-11-23 21:08:43,276 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2023-11-23 21:08:43,277 INFO  L78                 Accepts]: Start accepts. Automaton has  has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10
[2023-11-23 21:08:43,277 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-23 21:08:43,277 INFO  L225             Difference]: With dead ends: 28
[2023-11-23 21:08:43,277 INFO  L226             Difference]: Without dead ends: 18
[2023-11-23 21:08:43,278 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2023-11-23 21:08:43,279 INFO  L413           NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time
[2023-11-23 21:08:43,280 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time]
[2023-11-23 21:08:43,281 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 18 states.
[2023-11-23 21:08:43,284 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18.
[2023-11-23 21:08:43,284 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 18 states, 17 states have (on average 1.7058823529411764) internal successors, (29), 17 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-23 21:08:43,285 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 29 transitions.
[2023-11-23 21:08:43,285 INFO  L78                 Accepts]: Start accepts. Automaton has 18 states and 29 transitions. Word has length 10
[2023-11-23 21:08:43,285 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-23 21:08:43,285 INFO  L495      AbstractCegarLoop]: Abstraction has 18 states and 29 transitions.
[2023-11-23 21:08:43,286 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-23 21:08:43,286 INFO  L276                IsEmpty]: Start isEmpty. Operand 18 states and 29 transitions.
[2023-11-23 21:08:43,286 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 12
[2023-11-23 21:08:43,287 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-23 21:08:43,287 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-23 21:08:43,327 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0
[2023-11-23 21:08:43,487 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-23 21:08:43,488 INFO  L420      AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-23 21:08:43,488 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-23 21:08:43,488 INFO  L85        PathProgramCache]: Analyzing trace with hash 1122006345, now seen corresponding path program 1 times
[2023-11-23 21:08:43,488 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-23 21:08:43,489 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031409290]
[2023-11-23 21:08:43,489 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:08:43,489 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-23 21:08:44,021 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 21:08:45,307 INFO  L134       CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2023-11-23 21:08:45,307 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-23 21:08:45,310 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031409290]
[2023-11-23 21:08:45,313 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1031409290] provided 0 perfect and 1 imperfect interpolant sequences
[2023-11-23 21:08:45,315 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714479175]
[2023-11-23 21:08:45,315 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:08:45,315 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-23 21:08:45,319 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3
[2023-11-23 21:08:45,322 INFO  L229       MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-11-23 21:08:45,340 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process
[2023-11-23 21:08:47,251 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 21:08:47,298 INFO  L262         TraceCheckSpWp]: Trace formula consists of 6082 conjuncts, 6 conjunts are in the unsatisfiable core
[2023-11-23 21:08:47,306 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-11-23 21:08:47,321 INFO  L134       CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2023-11-23 21:08:47,321 INFO  L327         TraceCheckSpWp]: Computing backward predicates...
[2023-11-23 21:08:47,337 INFO  L134       CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked.
[2023-11-23 21:08:47,338 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1714479175] provided 1 perfect and 1 imperfect interpolant sequences
[2023-11-23 21:08:47,338 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences.
[2023-11-23 21:08:47,338 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 4] total 6
[2023-11-23 21:08:47,339 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1830072587]
[2023-11-23 21:08:47,339 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-23 21:08:47,339 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 3 states
[2023-11-23 21:08:47,340 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-23 21:08:47,341 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2023-11-23 21:08:47,342 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2023-11-23 21:08:47,343 INFO  L87              Difference]: Start difference. First operand 18 states and 29 transitions. Second operand  has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-23 21:08:47,813 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-23 21:08:47,813 INFO  L93              Difference]: Finished difference Result 25 states and 39 transitions.
[2023-11-23 21:08:47,814 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2023-11-23 21:08:47,814 INFO  L78                 Accepts]: Start accepts. Automaton has  has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 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 11
[2023-11-23 21:08:47,815 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-23 21:08:47,815 INFO  L225             Difference]: With dead ends: 25
[2023-11-23 21:08:47,815 INFO  L226             Difference]: Without dead ends: 19
[2023-11-23 21:08:47,816 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2023-11-23 21:08:47,817 INFO  L413           NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time
[2023-11-23 21:08:47,817 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 16 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time]
[2023-11-23 21:08:47,818 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 19 states.
[2023-11-23 21:08:47,821 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19.
[2023-11-23 21:08:47,822 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 19 states, 18 states have (on average 1.6666666666666667) 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)
[2023-11-23 21:08:47,822 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 30 transitions.
[2023-11-23 21:08:47,823 INFO  L78                 Accepts]: Start accepts. Automaton has 19 states and 30 transitions. Word has length 11
[2023-11-23 21:08:47,823 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-23 21:08:47,823 INFO  L495      AbstractCegarLoop]: Abstraction has 19 states and 30 transitions.
[2023-11-23 21:08:47,823 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-23 21:08:47,823 INFO  L276                IsEmpty]: Start isEmpty. Operand 19 states and 30 transitions.
[2023-11-23 21:08:47,824 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 13
[2023-11-23 21:08:47,824 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-23 21:08:47,824 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-23 21:08:47,866 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0
[2023-11-23 21:08:48,025 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-23 21:08:48,025 INFO  L420      AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-23 21:08:48,026 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-23 21:08:48,026 INFO  L85        PathProgramCache]: Analyzing trace with hash 431625581, now seen corresponding path program 1 times
[2023-11-23 21:08:48,026 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-23 21:08:48,026 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [261194091]
[2023-11-23 21:08:48,026 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:08:48,027 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-23 21:08:48,644 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 21:08:49,595 INFO  L134       CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked.
[2023-11-23 21:08:49,595 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-23 21:08:49,597 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [261194091]
[2023-11-23 21:08:49,601 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [261194091] provided 0 perfect and 1 imperfect interpolant sequences
[2023-11-23 21:08:49,601 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [253581935]
[2023-11-23 21:08:49,601 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:08:49,602 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-23 21:08:49,602 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3
[2023-11-23 21:08:49,603 INFO  L229       MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-11-23 21:08:49,624 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process
[2023-11-23 21:08:51,360 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 21:08:51,398 INFO  L262         TraceCheckSpWp]: Trace formula consists of 6094 conjuncts, 11 conjunts are in the unsatisfiable core
[2023-11-23 21:08:51,407 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-11-23 21:08:51,422 INFO  L134       CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked.
[2023-11-23 21:08:51,422 INFO  L327         TraceCheckSpWp]: Computing backward predicates...
[2023-11-23 21:08:51,443 INFO  L134       CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked.
[2023-11-23 21:08:51,444 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [253581935] provided 1 perfect and 1 imperfect interpolant sequences
[2023-11-23 21:08:51,444 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences.
[2023-11-23 21:08:51,444 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 6
[2023-11-23 21:08:51,444 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1088691792]
[2023-11-23 21:08:51,445 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-23 21:08:51,445 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 3 states
[2023-11-23 21:08:51,445 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-23 21:08:51,446 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2023-11-23 21:08:51,446 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2023-11-23 21:08:51,447 INFO  L87              Difference]: Start difference. First operand 19 states and 30 transitions. Second operand  has 3 states, 3 states have (on average 4.0) 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)
[2023-11-23 21:08:51,876 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-23 21:08:51,876 INFO  L93              Difference]: Finished difference Result 33 states and 52 transitions.
[2023-11-23 21:08:51,877 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2023-11-23 21:08:51,877 INFO  L78                 Accepts]: Start accepts. Automaton has  has 3 states, 3 states have (on average 4.0) 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
[2023-11-23 21:08:51,878 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-23 21:08:51,878 INFO  L225             Difference]: With dead ends: 33
[2023-11-23 21:08:51,878 INFO  L226             Difference]: Without dead ends: 20
[2023-11-23 21:08:51,879 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2023-11-23 21:08:51,880 INFO  L413           NwaCegarLoop]: 7 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time
[2023-11-23 21:08:51,881 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time]
[2023-11-23 21:08:51,882 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 20 states.
[2023-11-23 21:08:51,885 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20.
[2023-11-23 21:08:51,886 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 20 states, 19 states have (on average 1.631578947368421) internal successors, (31), 19 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-23 21:08:51,887 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 31 transitions.
[2023-11-23 21:08:51,887 INFO  L78                 Accepts]: Start accepts. Automaton has 20 states and 31 transitions. Word has length 12
[2023-11-23 21:08:51,887 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-23 21:08:51,888 INFO  L495      AbstractCegarLoop]: Abstraction has 20 states and 31 transitions.
[2023-11-23 21:08:51,888 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 3 states, 3 states have (on average 4.0) 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)
[2023-11-23 21:08:51,888 INFO  L276                IsEmpty]: Start isEmpty. Operand 20 states and 31 transitions.
[2023-11-23 21:08:51,889 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 15
[2023-11-23 21:08:51,889 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-23 21:08:51,889 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-23 21:08:51,927 INFO  L552       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0
[2023-11-23 21:08:52,105 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-23 21:08:52,105 INFO  L420      AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-23 21:08:52,105 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-23 21:08:52,106 INFO  L85        PathProgramCache]: Analyzing trace with hash -59773102, now seen corresponding path program 1 times
[2023-11-23 21:08:52,106 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-23 21:08:52,106 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1555923120]
[2023-11-23 21:08:52,106 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:08:52,106 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-23 21:08:52,623 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 21:08:53,639 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked.
[2023-11-23 21:08:53,640 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-23 21:08:53,640 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1555923120]
[2023-11-23 21:08:53,640 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1555923120] provided 0 perfect and 1 imperfect interpolant sequences
[2023-11-23 21:08:53,640 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1242289091]
[2023-11-23 21:08:53,640 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:08:53,641 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-23 21:08:53,641 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3
[2023-11-23 21:08:53,642 INFO  L229       MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-11-23 21:08:53,669 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process
[2023-11-23 21:08:55,367 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 21:08:55,420 INFO  L262         TraceCheckSpWp]: Trace formula consists of 6100 conjuncts, 12 conjunts are in the unsatisfiable core
[2023-11-23 21:08:55,428 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-11-23 21:08:55,467 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked.
[2023-11-23 21:08:55,467 INFO  L327         TraceCheckSpWp]: Computing backward predicates...
[2023-11-23 21:08:55,482 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked.
[2023-11-23 21:08:55,482 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1242289091] provided 1 perfect and 1 imperfect interpolant sequences
[2023-11-23 21:08:55,482 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences.
[2023-11-23 21:08:55,482 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 4] total 7
[2023-11-23 21:08:55,483 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1853759809]
[2023-11-23 21:08:55,483 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-23 21:08:55,483 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 3 states
[2023-11-23 21:08:55,484 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-23 21:08:55,484 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2023-11-23 21:08:55,484 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42
[2023-11-23 21:08:55,485 INFO  L87              Difference]: Start difference. First operand 20 states and 31 transitions. Second operand  has 3 states, 3 states have (on average 4.666666666666667) 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)
[2023-11-23 21:08:55,830 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-23 21:08:55,830 INFO  L93              Difference]: Finished difference Result 29 states and 44 transitions.
[2023-11-23 21:08:55,831 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2023-11-23 21:08:55,831 INFO  L78                 Accepts]: Start accepts. Automaton has  has 3 states, 3 states have (on average 4.666666666666667) 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
[2023-11-23 21:08:55,831 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-23 21:08:55,832 INFO  L225             Difference]: With dead ends: 29
[2023-11-23 21:08:55,832 INFO  L226             Difference]: Without dead ends: 21
[2023-11-23 21:08:55,832 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42
[2023-11-23 21:08:55,833 INFO  L413           NwaCegarLoop]: 7 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time
[2023-11-23 21:08:55,833 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time]
[2023-11-23 21:08:55,834 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 21 states.
[2023-11-23 21:08:55,837 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21.
[2023-11-23 21:08:55,838 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 21 states, 20 states have (on average 1.6) internal successors, (32), 20 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-23 21:08:55,838 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 32 transitions.
[2023-11-23 21:08:55,838 INFO  L78                 Accepts]: Start accepts. Automaton has 21 states and 32 transitions. Word has length 14
[2023-11-23 21:08:55,839 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-23 21:08:55,839 INFO  L495      AbstractCegarLoop]: Abstraction has 21 states and 32 transitions.
[2023-11-23 21:08:55,839 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 3 states, 3 states have (on average 4.666666666666667) 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)
[2023-11-23 21:08:55,839 INFO  L276                IsEmpty]: Start isEmpty. Operand 21 states and 32 transitions.
[2023-11-23 21:08:55,839 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 17
[2023-11-23 21:08:55,840 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-23 21:08:55,840 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-23 21:08:55,880 INFO  L552       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0
[2023-11-23 21:08:56,060 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-23 21:08:56,061 INFO  L420      AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-23 21:08:56,061 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-23 21:08:56,061 INFO  L85        PathProgramCache]: Analyzing trace with hash -1265201996, now seen corresponding path program 1 times
[2023-11-23 21:08:56,061 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-23 21:08:56,061 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [238845736]
[2023-11-23 21:08:56,061 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:08:56,062 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-23 21:08:56,481 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 21:08:57,340 INFO  L134       CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked.
[2023-11-23 21:08:57,340 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-23 21:08:57,341 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [238845736]
[2023-11-23 21:08:57,341 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [238845736] provided 0 perfect and 1 imperfect interpolant sequences
[2023-11-23 21:08:57,341 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [676654081]
[2023-11-23 21:08:57,341 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:08:57,341 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-23 21:08:57,342 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3
[2023-11-23 21:08:57,343 INFO  L229       MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-11-23 21:08:57,352 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process
[2023-11-23 21:08:59,040 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 21:08:59,071 INFO  L262         TraceCheckSpWp]: Trace formula consists of 6106 conjuncts, 12 conjunts are in the unsatisfiable core
[2023-11-23 21:08:59,076 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-11-23 21:08:59,114 INFO  L134       CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked.
[2023-11-23 21:08:59,115 INFO  L327         TraceCheckSpWp]: Computing backward predicates...
[2023-11-23 21:08:59,130 INFO  L134       CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked.
[2023-11-23 21:08:59,131 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [676654081] provided 1 perfect and 1 imperfect interpolant sequences
[2023-11-23 21:08:59,131 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences.
[2023-11-23 21:08:59,131 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 4] total 7
[2023-11-23 21:08:59,132 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138316176]
[2023-11-23 21:08:59,132 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-23 21:08:59,132 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 3 states
[2023-11-23 21:08:59,132 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-23 21:08:59,133 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2023-11-23 21:08:59,133 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42
[2023-11-23 21:08:59,133 INFO  L87              Difference]: Start difference. First operand 21 states and 32 transitions. Second operand  has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-23 21:08:59,436 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-23 21:08:59,436 INFO  L93              Difference]: Finished difference Result 25 states and 36 transitions.
[2023-11-23 21:08:59,436 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2023-11-23 21:08:59,437 INFO  L78                 Accepts]: Start accepts. Automaton has  has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 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 16
[2023-11-23 21:08:59,437 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-23 21:08:59,437 INFO  L225             Difference]: With dead ends: 25
[2023-11-23 21:08:59,437 INFO  L226             Difference]: Without dead ends: 22
[2023-11-23 21:08:59,438 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42
[2023-11-23 21:08:59,439 INFO  L413           NwaCegarLoop]: 7 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time
[2023-11-23 21:08:59,439 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time]
[2023-11-23 21:08:59,440 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 22 states.
[2023-11-23 21:08:59,443 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22.
[2023-11-23 21:08:59,443 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 22 states, 21 states have (on average 1.5714285714285714) internal successors, (33), 21 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-23 21:08:59,444 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 33 transitions.
[2023-11-23 21:08:59,444 INFO  L78                 Accepts]: Start accepts. Automaton has 22 states and 33 transitions. Word has length 16
[2023-11-23 21:08:59,444 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-23 21:08:59,444 INFO  L495      AbstractCegarLoop]: Abstraction has 22 states and 33 transitions.
[2023-11-23 21:08:59,445 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 3 states, 3 states have (on average 5.333333333333333) internal successors, (16), 3 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-23 21:08:59,445 INFO  L276                IsEmpty]: Start isEmpty. Operand 22 states and 33 transitions.
[2023-11-23 21:08:59,445 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 19
[2023-11-23 21:08:59,445 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-23 21:08:59,446 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-23 21:08:59,481 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0
[2023-11-23 21:08:59,660 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-23 21:08:59,661 INFO  L420      AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-23 21:08:59,661 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-23 21:08:59,661 INFO  L85        PathProgramCache]: Analyzing trace with hash -496013008, now seen corresponding path program 1 times
[2023-11-23 21:08:59,661 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-23 21:08:59,662 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172008348]
[2023-11-23 21:08:59,662 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:08:59,662 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-23 21:09:00,014 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 21:09:00,841 INFO  L134       CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked.
[2023-11-23 21:09:00,841 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-23 21:09:00,842 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172008348]
[2023-11-23 21:09:00,842 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172008348] provided 0 perfect and 1 imperfect interpolant sequences
[2023-11-23 21:09:00,842 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1676353664]
[2023-11-23 21:09:00,842 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:09:00,842 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-23 21:09:00,843 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3
[2023-11-23 21:09:00,845 INFO  L229       MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-11-23 21:09:00,872 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_81918a0f-b8ec-4000-bf39-25ecad3e8d6b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process