./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4_overflow.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit


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


Checking for ERROR reachability
Using default analysis
Version 30e01a73
Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ff2c507-63c9-4813-b199-50d280746579/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ff2c507-63c9-4813-b199-50d280746579/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_1ff2c507-63c9-4813-b199-50d280746579/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ff2c507-63c9-4813-b199-50d280746579/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4_overflow.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ff2c507-63c9-4813-b199-50d280746579/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_1ff2c507-63c9-4813-b199-50d280746579/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 8cf9a91c8f1111f4616406dfb4a7fdeef392d21e591ff8d6357140f3015668db
--- Real Ultimate output ---
This is Ultimate 0.2.3-dev-30e01a7
[2023-11-23 21:31:28,401 INFO  L188        SettingsManager]: Resetting all preferences to default values...
[2023-11-23 21:31:28,477 INFO  L114        SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ff2c507-63c9-4813-b199-50d280746579/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf
[2023-11-23 21:31:28,482 WARN  L101        SettingsManager]: Preference file contains the following unknown settings:
[2023-11-23 21:31:28,482 WARN  L103        SettingsManager]:   * de.uni_freiburg.informatik.ultimate.core.Log level for class
[2023-11-23 21:31:28,512 INFO  L130        SettingsManager]: Preferences different from defaults after loading the file:
[2023-11-23 21:31:28,513 INFO  L151        SettingsManager]: Preferences of UltimateCore differ from their defaults:
[2023-11-23 21:31:28,514 INFO  L153        SettingsManager]:  * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR;
[2023-11-23 21:31:28,514 INFO  L151        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2023-11-23 21:31:28,515 INFO  L153        SettingsManager]:  * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS
[2023-11-23 21:31:28,516 INFO  L153        SettingsManager]:  * User list type=DISABLED
[2023-11-23 21:31:28,516 INFO  L151        SettingsManager]: Preferences of Abstract Interpretation differ from their defaults:
[2023-11-23 21:31:28,517 INFO  L153        SettingsManager]:  * Explicit value domain=true
[2023-11-23 21:31:28,517 INFO  L153        SettingsManager]:  * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain
[2023-11-23 21:31:28,518 INFO  L153        SettingsManager]:  * Octagon Domain=false
[2023-11-23 21:31:28,519 INFO  L153        SettingsManager]:  * Abstract domain=CompoundDomain
[2023-11-23 21:31:28,519 INFO  L153        SettingsManager]:  * Check feasibility of abstract posts with an SMT solver=true
[2023-11-23 21:31:28,520 INFO  L153        SettingsManager]:  * Use the RCFG-of-the-future interface=true
[2023-11-23 21:31:28,520 INFO  L153        SettingsManager]:  * Interval Domain=false
[2023-11-23 21:31:28,521 INFO  L151        SettingsManager]: Preferences of Sifa differ from their defaults:
[2023-11-23 21:31:28,522 INFO  L153        SettingsManager]:  * Call Summarizer=TopInputCallSummarizer
[2023-11-23 21:31:28,526 INFO  L153        SettingsManager]:  * Simplification Technique=POLY_PAC
[2023-11-23 21:31:28,527 INFO  L151        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2023-11-23 21:31:28,527 INFO  L153        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2023-11-23 21:31:28,528 INFO  L153        SettingsManager]:  * sizeof long=4
[2023-11-23 21:31:28,528 INFO  L153        SettingsManager]:  * Overapproximate operations on floating types=true
[2023-11-23 21:31:28,529 INFO  L153        SettingsManager]:  * sizeof POINTER=4
[2023-11-23 21:31:28,529 INFO  L153        SettingsManager]:  * Check division by zero=IGNORE
[2023-11-23 21:31:28,530 INFO  L153        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2023-11-23 21:31:28,530 INFO  L153        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2023-11-23 21:31:28,531 INFO  L153        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2023-11-23 21:31:28,531 INFO  L153        SettingsManager]:  * sizeof long double=12
[2023-11-23 21:31:28,532 INFO  L153        SettingsManager]:  * Check if freed pointer was valid=false
[2023-11-23 21:31:28,532 INFO  L153        SettingsManager]:  * Use constant arrays=true
[2023-11-23 21:31:28,533 INFO  L151        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2023-11-23 21:31:28,533 INFO  L153        SettingsManager]:  * Only consider context switches at boundaries of atomic blocks=true
[2023-11-23 21:31:28,533 INFO  L153        SettingsManager]:  * SMT solver=External_DefaultMode
[2023-11-23 21:31:28,534 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2023-11-23 21:31:28,534 INFO  L151        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2023-11-23 21:31:28,534 INFO  L153        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2023-11-23 21:31:28,534 INFO  L153        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopHeads
[2023-11-23 21:31:28,535 INFO  L153        SettingsManager]:  * Trace refinement strategy=SIFA_TAIPAN
[2023-11-23 21:31:28,535 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2023-11-23 21:31:28,535 INFO  L153        SettingsManager]:  * Apply one-shot large block encoding in concurrent analysis=false
[2023-11-23 21:31:28,535 INFO  L153        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2023-11-23 21:31:28,536 INFO  L153        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2023-11-23 21:31:28,536 INFO  L153        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
[2023-11-23 21:31:28,536 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_1ff2c507-63c9-4813-b199-50d280746579/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_1ff2c507-63c9-4813-b199-50d280746579/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 -> 8cf9a91c8f1111f4616406dfb4a7fdeef392d21e591ff8d6357140f3015668db
[2023-11-23 21:31:28,799 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2023-11-23 21:31:28,822 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2023-11-23 21:31:28,825 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2023-11-23 21:31:28,826 INFO  L270        PluginConnector]: Initializing CDTParser...
[2023-11-23 21:31:28,827 INFO  L274        PluginConnector]: CDTParser initialized
[2023-11-23 21:31:28,828 INFO  L431   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ff2c507-63c9-4813-b199-50d280746579/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.4_overflow.ufo.UNBOUNDED.pals.c
[2023-11-23 21:31:31,845 INFO  L533              CDTParser]: Created temporary CDT project at NULL
[2023-11-23 21:31:32,115 INFO  L384              CDTParser]: Found 1 translation units.
[2023-11-23 21:31:32,116 INFO  L180              CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ff2c507-63c9-4813-b199-50d280746579/sv-benchmarks/c/seq-mthreaded/pals_lcr.4_overflow.ufo.UNBOUNDED.pals.c
[2023-11-23 21:31:32,135 INFO  L427              CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ff2c507-63c9-4813-b199-50d280746579/bin/utaipan-verify-mE87zJ7Ire/data/bd04ab083/23e7562a6e664873ba2cd53a6c0cb58f/FLAGe9700242a
[2023-11-23 21:31:32,151 INFO  L435              CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ff2c507-63c9-4813-b199-50d280746579/bin/utaipan-verify-mE87zJ7Ire/data/bd04ab083/23e7562a6e664873ba2cd53a6c0cb58f
[2023-11-23 21:31:32,154 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2023-11-23 21:31:32,155 INFO  L133        ToolchainWalker]: Walking toolchain with 6 elements.
[2023-11-23 21:31:32,157 INFO  L112        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2023-11-23 21:31:32,157 INFO  L270        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2023-11-23 21:31:32,163 INFO  L274        PluginConnector]: CACSL2BoogieTranslator initialized
[2023-11-23 21:31:32,163 INFO  L184        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:31:32" (1/1) ...
[2023-11-23 21:31:32,165 INFO  L204        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3589bdb6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:32, skipping insertion in model container
[2023-11-23 21:31:32,165 INFO  L184        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:31:32" (1/1) ...
[2023-11-23 21:31:32,202 INFO  L177         MainTranslator]: Built tables and reachable declarations
[2023-11-23 21:31:32,476 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_1ff2c507-63c9-4813-b199-50d280746579/sv-benchmarks/c/seq-mthreaded/pals_lcr.4_overflow.ufo.UNBOUNDED.pals.c[8379,8392]
[2023-11-23 21:31:32,486 INFO  L209          PostProcessor]: Analyzing one entry point: main
[2023-11-23 21:31:32,498 INFO  L202         MainTranslator]: Completed pre-run
[2023-11-23 21:31:32,544 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_1ff2c507-63c9-4813-b199-50d280746579/sv-benchmarks/c/seq-mthreaded/pals_lcr.4_overflow.ufo.UNBOUNDED.pals.c[8379,8392]
[2023-11-23 21:31:32,545 INFO  L209          PostProcessor]: Analyzing one entry point: main
[2023-11-23 21:31:32,568 INFO  L206         MainTranslator]: Completed translation
[2023-11-23 21:31:32,569 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:32 WrapperNode
[2023-11-23 21:31:32,569 INFO  L131        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2023-11-23 21:31:32,570 INFO  L112        PluginConnector]: ------------------------Boogie Procedure Inliner----------------------------
[2023-11-23 21:31:32,570 INFO  L270        PluginConnector]: Initializing Boogie Procedure Inliner...
[2023-11-23 21:31:32,571 INFO  L274        PluginConnector]: Boogie Procedure Inliner initialized
[2023-11-23 21:31:32,578 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:32" (1/1) ...
[2023-11-23 21:31:32,592 INFO  L184        PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:32" (1/1) ...
[2023-11-23 21:31:32,626 INFO  L138                Inliner]: procedures = 24, calls = 15, calls flagged for inlining = 10, calls inlined = 10, statements flattened = 272
[2023-11-23 21:31:32,627 INFO  L131        PluginConnector]: ------------------------ END Boogie Procedure Inliner----------------------------
[2023-11-23 21:31:32,628 INFO  L112        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2023-11-23 21:31:32,628 INFO  L270        PluginConnector]: Initializing Boogie Preprocessor...
[2023-11-23 21:31:32,628 INFO  L274        PluginConnector]: Boogie Preprocessor initialized
[2023-11-23 21:31:32,639 INFO  L184        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:32" (1/1) ...
[2023-11-23 21:31:32,640 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:32" (1/1) ...
[2023-11-23 21:31:32,654 INFO  L184        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:32" (1/1) ...
[2023-11-23 21:31:32,654 INFO  L184        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:32" (1/1) ...
[2023-11-23 21:31:32,662 INFO  L184        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:32" (1/1) ...
[2023-11-23 21:31:32,670 INFO  L184        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:32" (1/1) ...
[2023-11-23 21:31:32,673 INFO  L184        PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:32" (1/1) ...
[2023-11-23 21:31:32,675 INFO  L184        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:32" (1/1) ...
[2023-11-23 21:31:32,679 INFO  L131        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2023-11-23 21:31:32,680 INFO  L112        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2023-11-23 21:31:32,680 INFO  L270        PluginConnector]: Initializing RCFGBuilder...
[2023-11-23 21:31:32,680 INFO  L274        PluginConnector]: RCFGBuilder initialized
[2023-11-23 21:31:32,681 INFO  L184        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:32" (1/1) ...
[2023-11-23 21:31:32,700 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2023-11-23 21:31:32,750 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ff2c507-63c9-4813-b199-50d280746579/bin/utaipan-verify-mE87zJ7Ire/z3
[2023-11-23 21:31:32,763 INFO  L229       MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ff2c507-63c9-4813-b199-50d280746579/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
[2023-11-23 21:31:32,785 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ff2c507-63c9-4813-b199-50d280746579/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process
[2023-11-23 21:31:32,808 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit
[2023-11-23 21:31:32,808 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int
[2023-11-23 21:31:32,808 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2023-11-23 21:31:32,810 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2023-11-23 21:31:32,902 INFO  L241             CfgBuilder]: Building ICFG
[2023-11-23 21:31:32,904 INFO  L267             CfgBuilder]: Building CFG for each procedure with an implementation
[2023-11-23 21:31:33,335 INFO  L282             CfgBuilder]: Performing block encoding
[2023-11-23 21:31:33,850 INFO  L304             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2023-11-23 21:31:33,850 INFO  L309             CfgBuilder]: Removed 1 assume(true) statements.
[2023-11-23 21:31:33,852 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:31:33 BoogieIcfgContainer
[2023-11-23 21:31:33,852 INFO  L131        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2023-11-23 21:31:33,857 INFO  L112        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2023-11-23 21:31:33,857 INFO  L270        PluginConnector]: Initializing TraceAbstraction...
[2023-11-23 21:31:33,861 INFO  L274        PluginConnector]: TraceAbstraction initialized
[2023-11-23 21:31:33,862 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:31:32" (1/3) ...
[2023-11-23 21:31:33,864 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c8f0a95 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:31:33, skipping insertion in model container
[2023-11-23 21:31:33,864 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:32" (2/3) ...
[2023-11-23 21:31:33,866 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3c8f0a95 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:31:33, skipping insertion in model container
[2023-11-23 21:31:33,867 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:31:33" (3/3) ...
[2023-11-23 21:31:33,868 INFO  L112   eAbstractionObserver]: Analyzing ICFG pals_lcr.4_overflow.ufo.UNBOUNDED.pals.c
[2023-11-23 21:31:33,894 INFO  L203   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2023-11-23 21:31:33,895 INFO  L162   ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations.
[2023-11-23 21:31:33,958 INFO  L356      AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ========
[2023-11-23 21:31:33,964 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;@188a7134, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms]
[2023-11-23 21:31:33,965 INFO  L358      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2023-11-23 21:31:33,968 INFO  L276                IsEmpty]: Start isEmpty. Operand  has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 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 21:31:33,972 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 7
[2023-11-23 21:31:33,973 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-23 21:31:33,973 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1]
[2023-11-23 21:31:33,974 INFO  L420      AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-23 21:31:33,978 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-23 21:31:33,978 INFO  L85        PathProgramCache]: Analyzing trace with hash 154961817, now seen corresponding path program 1 times
[2023-11-23 21:31:33,985 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-23 21:31:33,986 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [233098655]
[2023-11-23 21:31:33,986 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:31:33,987 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-23 21:31:34,151 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 21:31:35,433 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 21:31:35,433 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-23 21:31:35,433 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [233098655]
[2023-11-23 21:31:35,434 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [233098655] provided 1 perfect and 0 imperfect interpolant sequences
[2023-11-23 21:31:35,434 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-11-23 21:31:35,435 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2023-11-23 21:31:35,438 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071801684]
[2023-11-23 21:31:35,438 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-23 21:31:35,443 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2023-11-23 21:31:35,443 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-23 21:31:35,488 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2023-11-23 21:31:35,489 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2023-11-23 21:31:35,492 INFO  L87              Difference]: Start difference. First operand  has 12 states, 10 states have (on average 1.6) internal successors, (16), 11 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) 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)
[2023-11-23 21:31:35,582 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-23 21:31:35,582 INFO  L93              Difference]: Finished difference Result 33 states and 48 transitions.
[2023-11-23 21:31:35,583 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2023-11-23 21:31:35,584 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
[2023-11-23 21:31:35,585 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-23 21:31:35,592 INFO  L225             Difference]: With dead ends: 33
[2023-11-23 21:31:35,592 INFO  L226             Difference]: Without dead ends: 22
[2023-11-23 21:31:35,595 INFO  L412           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
[2023-11-23 21:31:35,601 INFO  L413           NwaCegarLoop]: 7 mSDtfsCounter, 11 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2023-11-23 21:31:35,603 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 19 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2023-11-23 21:31:35,621 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 22 states.
[2023-11-23 21:31:35,633 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 13.
[2023-11-23 21:31:35,635 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 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 21:31:35,636 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions.
[2023-11-23 21:31:35,637 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 6
[2023-11-23 21:31:35,638 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-23 21:31:35,639 INFO  L495      AbstractCegarLoop]: Abstraction has 13 states and 16 transitions.
[2023-11-23 21:31:35,639 INFO  L496      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)
[2023-11-23 21:31:35,639 INFO  L276                IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions.
[2023-11-23 21:31:35,640 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 9
[2023-11-23 21:31:35,640 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-23 21:31:35,640 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-23 21:31:35,640 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2023-11-23 21:31:35,641 INFO  L420      AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-23 21:31:35,641 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-23 21:31:35,642 INFO  L85        PathProgramCache]: Analyzing trace with hash 2130964127, now seen corresponding path program 1 times
[2023-11-23 21:31:35,642 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-23 21:31:35,642 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903933795]
[2023-11-23 21:31:35,642 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:31:35,643 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-23 21:31:35,733 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 21:31:36,086 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 21:31:36,087 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-23 21:31:36,088 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903933795]
[2023-11-23 21:31:36,088 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [903933795] provided 1 perfect and 0 imperfect interpolant sequences
[2023-11-23 21:31:36,088 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-11-23 21:31:36,089 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2023-11-23 21:31:36,089 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698232495]
[2023-11-23 21:31:36,089 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-23 21:31:36,090 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2023-11-23 21:31:36,091 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-23 21:31:36,092 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2023-11-23 21:31:36,092 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2023-11-23 21:31:36,092 INFO  L87              Difference]: Start difference. First operand 13 states and 16 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)
[2023-11-23 21:31:36,136 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-23 21:31:36,137 INFO  L93              Difference]: Finished difference Result 32 states and 40 transitions.
[2023-11-23 21:31:36,137 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2023-11-23 21:31:36,138 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
[2023-11-23 21:31:36,138 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-23 21:31:36,138 INFO  L225             Difference]: With dead ends: 32
[2023-11-23 21:31:36,139 INFO  L226             Difference]: Without dead ends: 22
[2023-11-23 21:31:36,139 INFO  L412           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
[2023-11-23 21:31:36,141 INFO  L413           NwaCegarLoop]: 9 mSDtfsCounter, 9 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time
[2023-11-23 21:31:36,141 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 24 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time]
[2023-11-23 21:31:36,142 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 22 states.
[2023-11-23 21:31:36,146 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 14.
[2023-11-23 21:31:36,146 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 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 21:31:36,147 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions.
[2023-11-23 21:31:36,147 INFO  L78                 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 8
[2023-11-23 21:31:36,147 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-23 21:31:36,148 INFO  L495      AbstractCegarLoop]: Abstraction has 14 states and 17 transitions.
[2023-11-23 21:31:36,148 INFO  L496      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)
[2023-11-23 21:31:36,148 INFO  L276                IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions.
[2023-11-23 21:31:36,149 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 9
[2023-11-23 21:31:36,149 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-23 21:31:36,149 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-23 21:31:36,149 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2023-11-23 21:31:36,150 INFO  L420      AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-23 21:31:36,150 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-23 21:31:36,150 INFO  L85        PathProgramCache]: Analyzing trace with hash 2131857857, now seen corresponding path program 1 times
[2023-11-23 21:31:36,151 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-23 21:31:36,151 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [46659300]
[2023-11-23 21:31:36,151 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:31:36,151 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-23 21:31:36,178 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 21:31:36,877 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 21:31:36,877 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-23 21:31:36,878 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [46659300]
[2023-11-23 21:31:36,878 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [46659300] provided 1 perfect and 0 imperfect interpolant sequences
[2023-11-23 21:31:36,878 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-11-23 21:31:36,878 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2023-11-23 21:31:36,879 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471123276]
[2023-11-23 21:31:36,879 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-23 21:31:36,879 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2023-11-23 21:31:36,880 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-23 21:31:36,880 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2023-11-23 21:31:36,881 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2023-11-23 21:31:36,881 INFO  L87              Difference]: Start difference. First operand 14 states and 17 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)
[2023-11-23 21:31:36,938 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-23 21:31:36,938 INFO  L93              Difference]: Finished difference Result 32 states and 39 transitions.
[2023-11-23 21:31:36,939 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2023-11-23 21:31:36,939 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
[2023-11-23 21:31:36,939 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-23 21:31:36,941 INFO  L225             Difference]: With dead ends: 32
[2023-11-23 21:31:36,942 INFO  L226             Difference]: Without dead ends: 22
[2023-11-23 21:31:36,943 INFO  L412           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
[2023-11-23 21:31:36,944 INFO  L413           NwaCegarLoop]: 8 mSDtfsCounter, 7 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time
[2023-11-23 21:31:36,945 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 19 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time]
[2023-11-23 21:31:36,946 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 22 states.
[2023-11-23 21:31:36,949 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 15.
[2023-11-23 21:31:36,950 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-23 21:31:36,951 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions.
[2023-11-23 21:31:36,951 INFO  L78                 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 8
[2023-11-23 21:31:36,951 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-23 21:31:36,951 INFO  L495      AbstractCegarLoop]: Abstraction has 15 states and 18 transitions.
[2023-11-23 21:31:36,952 INFO  L496      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)
[2023-11-23 21:31:36,952 INFO  L276                IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions.
[2023-11-23 21:31:36,952 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 10
[2023-11-23 21:31:36,953 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-23 21:31:36,953 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-23 21:31:36,953 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2023-11-23 21:31:36,953 INFO  L420      AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-23 21:31:36,954 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-23 21:31:36,954 INFO  L85        PathProgramCache]: Analyzing trace with hash 1650291533, now seen corresponding path program 1 times
[2023-11-23 21:31:36,954 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-23 21:31:36,955 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1349012876]
[2023-11-23 21:31:36,955 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:31:36,955 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-23 21:31:36,977 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 21:31:37,661 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 21:31:37,661 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-23 21:31:37,661 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1349012876]
[2023-11-23 21:31:37,662 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1349012876] provided 1 perfect and 0 imperfect interpolant sequences
[2023-11-23 21:31:37,662 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-11-23 21:31:37,662 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2023-11-23 21:31:37,662 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333601425]
[2023-11-23 21:31:37,663 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-23 21:31:37,663 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2023-11-23 21:31:37,663 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-23 21:31:37,664 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2023-11-23 21:31:37,664 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2023-11-23 21:31:37,665 INFO  L87              Difference]: Start difference. First operand 15 states and 18 transitions. Second operand  has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 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 21:31:37,739 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-23 21:31:37,739 INFO  L93              Difference]: Finished difference Result 27 states and 30 transitions.
[2023-11-23 21:31:37,739 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2023-11-23 21:31:37,740 INFO  L78                 Accepts]: Start accepts. Automaton has  has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 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 21:31:37,740 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-23 21:31:37,741 INFO  L225             Difference]: With dead ends: 27
[2023-11-23 21:31:37,741 INFO  L226             Difference]: Without dead ends: 25
[2023-11-23 21:31:37,742 INFO  L412           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
[2023-11-23 21:31:37,743 INFO  L413           NwaCegarLoop]: 11 mSDtfsCounter, 11 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time
[2023-11-23 21:31:37,744 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 34 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time]
[2023-11-23 21:31:37,745 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 25 states.
[2023-11-23 21:31:37,748 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 18.
[2023-11-23 21:31:37,749 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 18 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 17 states have internal predecessors, (21), 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 21:31:37,749 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions.
[2023-11-23 21:31:37,750 INFO  L78                 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 9
[2023-11-23 21:31:37,750 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-23 21:31:37,750 INFO  L495      AbstractCegarLoop]: Abstraction has 18 states and 21 transitions.
[2023-11-23 21:31:37,750 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 5 states, 5 states have (on average 1.8) internal successors, (9), 5 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 21:31:37,751 INFO  L276                IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions.
[2023-11-23 21:31:37,751 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 15
[2023-11-23 21:31:37,751 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-23 21:31:37,752 INFO  L195           NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-23 21:31:37,752 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2023-11-23 21:31:37,752 INFO  L420      AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-23 21:31:37,752 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-23 21:31:37,753 INFO  L85        PathProgramCache]: Analyzing trace with hash 1992860839, now seen corresponding path program 1 times
[2023-11-23 21:31:37,753 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-23 21:31:37,753 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [342615345]
[2023-11-23 21:31:37,753 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:31:37,754 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-23 21:31:37,857 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 21:31:41,877 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-23 21:31:41,878 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-23 21:31:41,878 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [342615345]
[2023-11-23 21:31:41,878 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [342615345] provided 0 perfect and 1 imperfect interpolant sequences
[2023-11-23 21:31:41,879 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1962390284]
[2023-11-23 21:31:41,881 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 21:31:41,881 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-23 21:31:41,882 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ff2c507-63c9-4813-b199-50d280746579/bin/utaipan-verify-mE87zJ7Ire/z3
[2023-11-23 21:31:41,883 INFO  L229       MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ff2c507-63c9-4813-b199-50d280746579/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-11-23 21:31:41,921 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1ff2c507-63c9-4813-b199-50d280746579/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process
[2023-11-23 21:31:42,102 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 21:31:42,105 INFO  L262         TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 39 conjunts are in the unsatisfiable core
[2023-11-23 21:31:42,121 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-11-23 21:31:46,609 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-23 21:31:46,610 INFO  L327         TraceCheckSpWp]: Computing backward predicates...