./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.2.ufo.UNBOUNDED.pals.c --full-output --architecture 32bit


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


Checking for ERROR reachability
Using default analysis
Version 47ea0209
Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.2.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8 --witnessprinter.witness.filename witness.graphml --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 dc5c360927b8f961c81c15f32a759fd4b0c6971bec3efffa8564070a88946c3e
--- Real Ultimate output ---
This is Ultimate 0.2.1-dev-47ea020
[2021-11-07 01:27:53,583 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2021-11-07 01:27:53,587 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2021-11-07 01:27:53,648 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2021-11-07 01:27:53,648 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2021-11-07 01:27:53,655 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2021-11-07 01:27:53,657 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2021-11-07 01:27:53,661 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2021-11-07 01:27:53,664 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2021-11-07 01:27:53,669 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2021-11-07 01:27:53,670 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2021-11-07 01:27:53,672 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2021-11-07 01:27:53,673 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2021-11-07 01:27:53,676 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2021-11-07 01:27:53,678 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2021-11-07 01:27:53,684 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2021-11-07 01:27:53,686 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2021-11-07 01:27:53,687 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2021-11-07 01:27:53,694 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2021-11-07 01:27:53,701 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2021-11-07 01:27:53,703 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2021-11-07 01:27:53,708 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2021-11-07 01:27:53,709 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2021-11-07 01:27:53,710 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2021-11-07 01:27:53,714 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2021-11-07 01:27:53,714 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2021-11-07 01:27:53,715 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2021-11-07 01:27:53,716 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2021-11-07 01:27:53,716 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2021-11-07 01:27:53,717 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2021-11-07 01:27:53,718 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2021-11-07 01:27:53,719 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2021-11-07 01:27:53,719 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2021-11-07 01:27:53,720 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2021-11-07 01:27:53,721 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2021-11-07 01:27:53,722 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2021-11-07 01:27:53,722 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2021-11-07 01:27:53,722 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2021-11-07 01:27:53,723 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2021-11-07 01:27:53,724 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2021-11-07 01:27:53,724 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2021-11-07 01:27:53,725 INFO  L101        SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf
[2021-11-07 01:27:53,767 INFO  L113        SettingsManager]: Loading preferences was successful
[2021-11-07 01:27:53,767 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2021-11-07 01:27:53,768 INFO  L136        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2021-11-07 01:27:53,769 INFO  L138        SettingsManager]:  * User list type=DISABLED
[2021-11-07 01:27:53,769 INFO  L136        SettingsManager]: Preferences of Abstract Interpretation differ from their defaults:
[2021-11-07 01:27:53,769 INFO  L138        SettingsManager]:  * Explicit value domain=true
[2021-11-07 01:27:53,769 INFO  L138        SettingsManager]:  * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain
[2021-11-07 01:27:53,769 INFO  L138        SettingsManager]:  * Octagon Domain=false
[2021-11-07 01:27:53,776 INFO  L138        SettingsManager]:  * Abstract domain=CompoundDomain
[2021-11-07 01:27:53,776 INFO  L138        SettingsManager]:  * Check feasibility of abstract posts with an SMT solver=true
[2021-11-07 01:27:53,777 INFO  L138        SettingsManager]:  * Use the RCFG-of-the-future interface=true
[2021-11-07 01:27:53,777 INFO  L138        SettingsManager]:  * Interval Domain=false
[2021-11-07 01:27:53,778 INFO  L136        SettingsManager]: Preferences of Sifa differ from their defaults:
[2021-11-07 01:27:53,778 INFO  L138        SettingsManager]:  * Call Summarizer=TopInputCallSummarizer
[2021-11-07 01:27:53,778 INFO  L138        SettingsManager]:  * Simplification Technique=SIMPLIFY_QUICK
[2021-11-07 01:27:53,779 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2021-11-07 01:27:53,779 INFO  L138        SettingsManager]:  * sizeof long=4
[2021-11-07 01:27:53,779 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2021-11-07 01:27:53,780 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2021-11-07 01:27:53,780 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2021-11-07 01:27:53,780 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2021-11-07 01:27:53,780 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2021-11-07 01:27:53,780 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2021-11-07 01:27:53,781 INFO  L138        SettingsManager]:  * Adapt memory model on pointer casts if necessary=true
[2021-11-07 01:27:53,781 INFO  L138        SettingsManager]:  * sizeof long double=12
[2021-11-07 01:27:53,781 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2021-11-07 01:27:53,781 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2021-11-07 01:27:53,782 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2021-11-07 01:27:53,782 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2021-11-07 01:27:53,784 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2021-11-07 01:27:53,784 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2021-11-07 01:27:53,785 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2021-11-07 01:27:53,785 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2021-11-07 01:27:53,785 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2021-11-07 01:27:53,785 INFO  L138        SettingsManager]:  * Trace refinement strategy=SIFA_TAIPAN
[2021-11-07 01:27:53,786 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2021-11-07 01:27:53,786 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2021-11-07 01:27:53,786 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2021-11-07 01:27:53,786 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
[2021-11-07 01:27:53,786 INFO  L138        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_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8/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_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8
Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml
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 -> dc5c360927b8f961c81c15f32a759fd4b0c6971bec3efffa8564070a88946c3e
[2021-11-07 01:27:54,059 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2021-11-07 01:27:54,082 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2021-11-07 01:27:54,085 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2021-11-07 01:27:54,087 INFO  L271        PluginConnector]: Initializing CDTParser...
[2021-11-07 01:27:54,087 INFO  L275        PluginConnector]: CDTParser initialized
[2021-11-07 01:27:54,088 INFO  L432   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.2.ufo.UNBOUNDED.pals.c
[2021-11-07 01:27:54,183 INFO  L220              CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8/data/73862d235/e3f63fb0894f45d89d93af0374d03b1d/FLAGd316cfb79
[2021-11-07 01:27:54,784 INFO  L306              CDTParser]: Found 1 translation units.
[2021-11-07 01:27:54,784 INFO  L160              CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b9408c-f9cb-4b68-bf11-2db4e585fe23/sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.2.ufo.UNBOUNDED.pals.c
[2021-11-07 01:27:54,799 INFO  L349              CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8/data/73862d235/e3f63fb0894f45d89d93af0374d03b1d/FLAGd316cfb79
[2021-11-07 01:27:55,075 INFO  L357              CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8/data/73862d235/e3f63fb0894f45d89d93af0374d03b1d
[2021-11-07 01:27:55,077 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2021-11-07 01:27:55,079 INFO  L131        ToolchainWalker]: Walking toolchain with 6 elements.
[2021-11-07 01:27:55,080 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2021-11-07 01:27:55,081 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2021-11-07 01:27:55,084 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2021-11-07 01:27:55,084 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:27:55" (1/1) ...
[2021-11-07 01:27:55,085 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@189fbdd3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:55, skipping insertion in model container
[2021-11-07 01:27:55,086 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:27:55" (1/1) ...
[2021-11-07 01:27:55,093 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2021-11-07 01:27:55,128 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2021-11-07 01:27:55,357 WARN  L228   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_90b9408c-f9cb-4b68-bf11-2db4e585fe23/sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.2.ufo.UNBOUNDED.pals.c[12914,12927]
[2021-11-07 01:27:55,360 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2021-11-07 01:27:55,369 INFO  L203         MainTranslator]: Completed pre-run
[2021-11-07 01:27:55,428 WARN  L228   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_90b9408c-f9cb-4b68-bf11-2db4e585fe23/sv-benchmarks/c/seq-mthreaded/pals_floodmax.3.2.ufo.UNBOUNDED.pals.c[12914,12927]
[2021-11-07 01:27:55,429 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2021-11-07 01:27:55,444 INFO  L208         MainTranslator]: Completed translation
[2021-11-07 01:27:55,445 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:55 WrapperNode
[2021-11-07 01:27:55,445 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2021-11-07 01:27:55,446 INFO  L113        PluginConnector]: ------------------------Boogie Procedure Inliner----------------------------
[2021-11-07 01:27:55,446 INFO  L271        PluginConnector]: Initializing Boogie Procedure Inliner...
[2021-11-07 01:27:55,446 INFO  L275        PluginConnector]: Boogie Procedure Inliner initialized
[2021-11-07 01:27:55,454 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:55" (1/1) ...
[2021-11-07 01:27:55,465 INFO  L185        PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:55" (1/1) ...
[2021-11-07 01:27:55,502 INFO  L132        PluginConnector]: ------------------------ END Boogie Procedure Inliner----------------------------
[2021-11-07 01:27:55,515 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2021-11-07 01:27:55,516 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2021-11-07 01:27:55,516 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2021-11-07 01:27:55,524 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:55" (1/1) ...
[2021-11-07 01:27:55,524 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:55" (1/1) ...
[2021-11-07 01:27:55,529 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:55" (1/1) ...
[2021-11-07 01:27:55,530 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:55" (1/1) ...
[2021-11-07 01:27:55,540 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:55" (1/1) ...
[2021-11-07 01:27:55,549 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:55" (1/1) ...
[2021-11-07 01:27:55,552 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:55" (1/1) ...
[2021-11-07 01:27:55,558 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2021-11-07 01:27:55,559 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2021-11-07 01:27:55,575 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2021-11-07 01:27:55,575 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2021-11-07 01:27:55,576 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:55" (1/1) ...
[2021-11-07 01:27:55,584 INFO  L168          SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2021-11-07 01:27:55,599 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8/z3
[2021-11-07 01:27:55,625 INFO  L229       MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
[2021-11-07 01:27:55,635 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process
[2021-11-07 01:27:55,663 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int
[2021-11-07 01:27:55,663 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack
[2021-11-07 01:27:55,663 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2021-11-07 01:27:55,663 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2021-11-07 01:27:58,238 INFO  L294             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2021-11-07 01:27:58,238 INFO  L299             CfgBuilder]: Removed 17 assume(true) statements.
[2021-11-07 01:27:58,241 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:27:58 BoogieIcfgContainer
[2021-11-07 01:27:58,241 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2021-11-07 01:27:58,243 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2021-11-07 01:27:58,243 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2021-11-07 01:27:58,247 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2021-11-07 01:27:58,247 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:27:55" (1/3) ...
[2021-11-07 01:27:58,248 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6eb5d6c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:27:58, skipping insertion in model container
[2021-11-07 01:27:58,248 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:27:55" (2/3) ...
[2021-11-07 01:27:58,248 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6eb5d6c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:27:58, skipping insertion in model container
[2021-11-07 01:27:58,249 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:27:58" (3/3) ...
[2021-11-07 01:27:58,250 INFO  L111   eAbstractionObserver]: Analyzing ICFG pals_floodmax.3.2.ufo.UNBOUNDED.pals.c
[2021-11-07 01:27:58,256 INFO  L204   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2021-11-07 01:27:58,256 INFO  L163   ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations.
[2021-11-07 01:27:58,329 INFO  L338      AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ========
[2021-11-07 01:27:58,338 INFO  L339      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=LoopsAndPotentialCycles, 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, mLoopAccelerationTechnique=FAST_UPR
[2021-11-07 01:27:58,338 INFO  L340      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2021-11-07 01:27:58,361 INFO  L276                IsEmpty]: Start isEmpty. Operand  has 18 states, 16 states have (on average 1.8125) 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)
[2021-11-07 01:27:58,368 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 7
[2021-11-07 01:27:58,368 INFO  L505         BasicCegarLoop]: Found error trace
[2021-11-07 01:27:58,369 INFO  L513         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1]
[2021-11-07 01:27:58,369 INFO  L402      AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2021-11-07 01:27:58,390 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2021-11-07 01:27:58,390 INFO  L85        PathProgramCache]: Analyzing trace with hash -5822625, now seen corresponding path program 1 times
[2021-11-07 01:27:58,400 INFO  L121   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2021-11-07 01:27:58,401 INFO  L332   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [233684001]
[2021-11-07 01:27:58,401 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2021-11-07 01:27:58,402 INFO  L126          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2021-11-07 01:27:58,767 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2021-11-07 01:27:59,078 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2021-11-07 01:27:59,078 INFO  L139   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2021-11-07 01:27:59,079 INFO  L332   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [233684001]
[2021-11-07 01:27:59,080 INFO  L160   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [233684001] provided 1 perfect and 0 imperfect interpolant sequences
[2021-11-07 01:27:59,080 INFO  L186   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2021-11-07 01:27:59,080 INFO  L199   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2021-11-07 01:27:59,082 INFO  L115   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073798720]
[2021-11-07 01:27:59,089 INFO  L546      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2021-11-07 01:27:59,090 INFO  L103   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2021-11-07 01:27:59,109 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2021-11-07 01:27:59,110 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2021-11-07 01:27:59,112 INFO  L87              Difference]: Start difference. First operand  has 18 states, 16 states have (on average 1.8125) 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) 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)
[2021-11-07 01:27:59,245 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2021-11-07 01:27:59,245 INFO  L93              Difference]: Finished difference Result 51 states and 87 transitions.
[2021-11-07 01:27:59,246 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2021-11-07 01:27:59,247 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
[2021-11-07 01:27:59,248 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2021-11-07 01:27:59,258 INFO  L225             Difference]: With dead ends: 51
[2021-11-07 01:27:59,259 INFO  L226             Difference]: Without dead ends: 34
[2021-11-07 01:27:59,264 INFO  L786         BasicCegarLoop]: 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
[2021-11-07 01:27:59,280 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 34 states.
[2021-11-07 01:27:59,306 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26.
[2021-11-07 01:27:59,308 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 26 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2021-11-07 01:27:59,310 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 41 transitions.
[2021-11-07 01:27:59,312 INFO  L78                 Accepts]: Start accepts. Automaton has 26 states and 41 transitions. Word has length 6
[2021-11-07 01:27:59,312 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2021-11-07 01:27:59,312 INFO  L470      AbstractCegarLoop]: Abstraction has 26 states and 41 transitions.
[2021-11-07 01:27:59,313 INFO  L471      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)
[2021-11-07 01:27:59,313 INFO  L276                IsEmpty]: Start isEmpty. Operand 26 states and 41 transitions.
[2021-11-07 01:27:59,314 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 8
[2021-11-07 01:27:59,314 INFO  L505         BasicCegarLoop]: Found error trace
[2021-11-07 01:27:59,314 INFO  L513         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1]
[2021-11-07 01:27:59,314 WARN  L452      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2021-11-07 01:27:59,315 INFO  L402      AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2021-11-07 01:27:59,318 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2021-11-07 01:27:59,318 INFO  L85        PathProgramCache]: Analyzing trace with hash -243164739, now seen corresponding path program 1 times
[2021-11-07 01:27:59,318 INFO  L121   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2021-11-07 01:27:59,319 INFO  L332   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1193547464]
[2021-11-07 01:27:59,319 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2021-11-07 01:27:59,319 INFO  L126          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2021-11-07 01:27:59,441 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2021-11-07 01:27:59,587 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2021-11-07 01:27:59,588 INFO  L139   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2021-11-07 01:27:59,588 INFO  L332   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1193547464]
[2021-11-07 01:27:59,588 INFO  L160   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1193547464] provided 1 perfect and 0 imperfect interpolant sequences
[2021-11-07 01:27:59,589 INFO  L186   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2021-11-07 01:27:59,589 INFO  L199   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2021-11-07 01:27:59,589 INFO  L115   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000128208]
[2021-11-07 01:27:59,590 INFO  L546      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2021-11-07 01:27:59,591 INFO  L103   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2021-11-07 01:27:59,593 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2021-11-07 01:27:59,593 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2021-11-07 01:27:59,594 INFO  L87              Difference]: Start difference. First operand 26 states and 41 transitions. Second operand  has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2021-11-07 01:27:59,679 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2021-11-07 01:27:59,679 INFO  L93              Difference]: Finished difference Result 50 states and 77 transitions.
[2021-11-07 01:27:59,679 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2021-11-07 01:27:59,681 INFO  L78                 Accepts]: Start accepts. Automaton has  has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7
[2021-11-07 01:27:59,681 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2021-11-07 01:27:59,682 INFO  L225             Difference]: With dead ends: 50
[2021-11-07 01:27:59,682 INFO  L226             Difference]: Without dead ends: 34
[2021-11-07 01:27:59,683 INFO  L786         BasicCegarLoop]: 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
[2021-11-07 01:27:59,684 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 34 states.
[2021-11-07 01:27:59,688 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26.
[2021-11-07 01:27:59,689 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 26 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2021-11-07 01:27:59,690 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 40 transitions.
[2021-11-07 01:27:59,690 INFO  L78                 Accepts]: Start accepts. Automaton has 26 states and 40 transitions. Word has length 7
[2021-11-07 01:27:59,690 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2021-11-07 01:27:59,691 INFO  L470      AbstractCegarLoop]: Abstraction has 26 states and 40 transitions.
[2021-11-07 01:27:59,691 INFO  L471      AbstractCegarLoop]: INTERPOLANT automaton has  has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2021-11-07 01:27:59,691 INFO  L276                IsEmpty]: Start isEmpty. Operand 26 states and 40 transitions.
[2021-11-07 01:27:59,692 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 9
[2021-11-07 01:27:59,692 INFO  L505         BasicCegarLoop]: Found error trace
[2021-11-07 01:27:59,692 INFO  L513         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1]
[2021-11-07 01:27:59,693 WARN  L452      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2021-11-07 01:27:59,693 INFO  L402      AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2021-11-07 01:27:59,693 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2021-11-07 01:27:59,694 INFO  L85        PathProgramCache]: Analyzing trace with hash 994616072, now seen corresponding path program 1 times
[2021-11-07 01:27:59,694 INFO  L121   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2021-11-07 01:27:59,694 INFO  L332   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1662236646]
[2021-11-07 01:27:59,695 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2021-11-07 01:27:59,695 INFO  L126          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2021-11-07 01:27:59,755 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2021-11-07 01:27:59,885 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2021-11-07 01:27:59,885 INFO  L139   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2021-11-07 01:27:59,885 INFO  L332   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1662236646]
[2021-11-07 01:27:59,886 INFO  L160   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1662236646] provided 1 perfect and 0 imperfect interpolant sequences
[2021-11-07 01:27:59,886 INFO  L186   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2021-11-07 01:27:59,886 INFO  L199   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2021-11-07 01:27:59,886 INFO  L115   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012348434]
[2021-11-07 01:27:59,887 INFO  L546      AbstractCegarLoop]: INTERPOLANT automaton has 6 states
[2021-11-07 01:27:59,887 INFO  L103   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2021-11-07 01:27:59,887 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2021-11-07 01:27:59,888 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2021-11-07 01:27:59,888 INFO  L87              Difference]: Start difference. First operand 26 states and 40 transitions. Second operand  has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 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)
[2021-11-07 01:28:00,071 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2021-11-07 01:28:00,071 INFO  L93              Difference]: Finished difference Result 55 states and 81 transitions.
[2021-11-07 01:28:00,071 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2021-11-07 01:28:00,072 INFO  L78                 Accepts]: Start accepts. Automaton has  has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 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
[2021-11-07 01:28:00,072 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2021-11-07 01:28:00,073 INFO  L225             Difference]: With dead ends: 55
[2021-11-07 01:28:00,073 INFO  L226             Difference]: Without dead ends: 39
[2021-11-07 01:28:00,073 INFO  L786         BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56
[2021-11-07 01:28:00,074 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 39 states.
[2021-11-07 01:28:00,078 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 26.
[2021-11-07 01:28:00,079 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 26 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2021-11-07 01:28:00,082 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 39 transitions.
[2021-11-07 01:28:00,082 INFO  L78                 Accepts]: Start accepts. Automaton has 26 states and 39 transitions. Word has length 8
[2021-11-07 01:28:00,082 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2021-11-07 01:28:00,082 INFO  L470      AbstractCegarLoop]: Abstraction has 26 states and 39 transitions.
[2021-11-07 01:28:00,083 INFO  L471      AbstractCegarLoop]: INTERPOLANT automaton has  has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 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)
[2021-11-07 01:28:00,083 INFO  L276                IsEmpty]: Start isEmpty. Operand 26 states and 39 transitions.
[2021-11-07 01:28:00,084 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 10
[2021-11-07 01:28:00,084 INFO  L505         BasicCegarLoop]: Found error trace
[2021-11-07 01:28:00,084 INFO  L513         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1]
[2021-11-07 01:28:00,085 WARN  L452      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2021-11-07 01:28:00,085 INFO  L402      AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2021-11-07 01:28:00,086 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2021-11-07 01:28:00,086 INFO  L85        PathProgramCache]: Analyzing trace with hash 716567302, now seen corresponding path program 1 times
[2021-11-07 01:28:00,086 INFO  L121   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2021-11-07 01:28:00,087 INFO  L332   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1313911034]
[2021-11-07 01:28:00,087 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2021-11-07 01:28:00,087 INFO  L126          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2021-11-07 01:28:00,196 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2021-11-07 01:28:00,318 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2021-11-07 01:28:00,318 INFO  L139   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2021-11-07 01:28:00,318 INFO  L332   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1313911034]
[2021-11-07 01:28:00,324 INFO  L160   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1313911034] provided 1 perfect and 0 imperfect interpolant sequences
[2021-11-07 01:28:00,324 INFO  L186   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2021-11-07 01:28:00,325 INFO  L199   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2021-11-07 01:28:00,326 INFO  L115   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [48956377]
[2021-11-07 01:28:00,326 INFO  L546      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2021-11-07 01:28:00,326 INFO  L103   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2021-11-07 01:28:00,328 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2021-11-07 01:28:00,328 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2021-11-07 01:28:00,329 INFO  L87              Difference]: Start difference. First operand 26 states and 39 transitions. Second operand  has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2021-11-07 01:28:00,425 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2021-11-07 01:28:00,425 INFO  L93              Difference]: Finished difference Result 50 states and 75 transitions.
[2021-11-07 01:28:00,426 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2021-11-07 01:28:00,426 INFO  L78                 Accepts]: Start accepts. Automaton has  has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9
[2021-11-07 01:28:00,426 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2021-11-07 01:28:00,429 INFO  L225             Difference]: With dead ends: 50
[2021-11-07 01:28:00,429 INFO  L226             Difference]: Without dead ends: 34
[2021-11-07 01:28:00,431 INFO  L786         BasicCegarLoop]: 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
[2021-11-07 01:28:00,432 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 34 states.
[2021-11-07 01:28:00,445 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26.
[2021-11-07 01:28:00,445 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 26 states, 25 states have (on average 1.52) internal successors, (38), 25 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2021-11-07 01:28:00,448 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 38 transitions.
[2021-11-07 01:28:00,448 INFO  L78                 Accepts]: Start accepts. Automaton has 26 states and 38 transitions. Word has length 9
[2021-11-07 01:28:00,448 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2021-11-07 01:28:00,448 INFO  L470      AbstractCegarLoop]: Abstraction has 26 states and 38 transitions.
[2021-11-07 01:28:00,449 INFO  L471      AbstractCegarLoop]: INTERPOLANT automaton has  has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2021-11-07 01:28:00,449 INFO  L276                IsEmpty]: Start isEmpty. Operand 26 states and 38 transitions.
[2021-11-07 01:28:00,449 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 13
[2021-11-07 01:28:00,449 INFO  L505         BasicCegarLoop]: Found error trace
[2021-11-07 01:28:00,450 INFO  L513         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2021-11-07 01:28:00,450 WARN  L452      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2021-11-07 01:28:00,450 INFO  L402      AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2021-11-07 01:28:00,451 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2021-11-07 01:28:00,451 INFO  L85        PathProgramCache]: Analyzing trace with hash -1577857153, now seen corresponding path program 1 times
[2021-11-07 01:28:00,451 INFO  L121   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2021-11-07 01:28:00,451 INFO  L332   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [357452409]
[2021-11-07 01:28:00,452 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2021-11-07 01:28:00,452 INFO  L126          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2021-11-07 01:28:00,627 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2021-11-07 01:28:00,718 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2021-11-07 01:28:00,719 INFO  L139   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2021-11-07 01:28:00,719 INFO  L332   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [357452409]
[2021-11-07 01:28:00,719 INFO  L160   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [357452409] provided 1 perfect and 0 imperfect interpolant sequences
[2021-11-07 01:28:00,719 INFO  L186   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2021-11-07 01:28:00,720 INFO  L199   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2021-11-07 01:28:00,720 INFO  L115   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983695226]
[2021-11-07 01:28:00,720 INFO  L546      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2021-11-07 01:28:00,721 INFO  L103   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2021-11-07 01:28:00,721 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2021-11-07 01:28:00,721 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2021-11-07 01:28:00,722 INFO  L87              Difference]: Start difference. First operand 26 states and 38 transitions. Second operand  has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2021-11-07 01:28:00,795 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2021-11-07 01:28:00,795 INFO  L93              Difference]: Finished difference Result 51 states and 76 transitions.
[2021-11-07 01:28:00,795 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2021-11-07 01:28:00,796 INFO  L78                 Accepts]: Start accepts. Automaton has  has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12
[2021-11-07 01:28:00,796 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2021-11-07 01:28:00,797 INFO  L225             Difference]: With dead ends: 51
[2021-11-07 01:28:00,797 INFO  L226             Difference]: Without dead ends: 33
[2021-11-07 01:28:00,797 INFO  L786         BasicCegarLoop]: 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
[2021-11-07 01:28:00,798 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 33 states.
[2021-11-07 01:28:00,802 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26.
[2021-11-07 01:28:00,802 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 26 states, 25 states have (on average 1.44) internal successors, (36), 25 states have internal predecessors, (36), 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)
[2021-11-07 01:28:00,803 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 36 transitions.
[2021-11-07 01:28:00,803 INFO  L78                 Accepts]: Start accepts. Automaton has 26 states and 36 transitions. Word has length 12
[2021-11-07 01:28:00,803 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2021-11-07 01:28:00,804 INFO  L470      AbstractCegarLoop]: Abstraction has 26 states and 36 transitions.
[2021-11-07 01:28:00,804 INFO  L471      AbstractCegarLoop]: INTERPOLANT automaton has  has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2021-11-07 01:28:00,804 INFO  L276                IsEmpty]: Start isEmpty. Operand 26 states and 36 transitions.
[2021-11-07 01:28:00,805 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 15
[2021-11-07 01:28:00,805 INFO  L505         BasicCegarLoop]: Found error trace
[2021-11-07 01:28:00,805 INFO  L513         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2021-11-07 01:28:00,805 WARN  L452      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2021-11-07 01:28:00,806 INFO  L402      AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2021-11-07 01:28:00,806 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2021-11-07 01:28:00,806 INFO  L85        PathProgramCache]: Analyzing trace with hash 1315595493, now seen corresponding path program 1 times
[2021-11-07 01:28:00,806 INFO  L121   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2021-11-07 01:28:00,807 INFO  L332   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [279582207]
[2021-11-07 01:28:00,807 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2021-11-07 01:28:00,807 INFO  L126          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2021-11-07 01:28:00,855 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2021-11-07 01:28:00,944 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2021-11-07 01:28:00,944 INFO  L139   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2021-11-07 01:28:00,944 INFO  L332   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [279582207]
[2021-11-07 01:28:00,944 INFO  L160   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [279582207] provided 1 perfect and 0 imperfect interpolant sequences
[2021-11-07 01:28:00,945 INFO  L186   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2021-11-07 01:28:00,945 INFO  L199   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2021-11-07 01:28:00,945 INFO  L115   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774351560]
[2021-11-07 01:28:00,945 INFO  L546      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2021-11-07 01:28:00,946 INFO  L103   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2021-11-07 01:28:00,946 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2021-11-07 01:28:00,946 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2021-11-07 01:28:00,946 INFO  L87              Difference]: Start difference. First operand 26 states and 36 transitions. Second operand  has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2021-11-07 01:28:01,023 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2021-11-07 01:28:01,023 INFO  L93              Difference]: Finished difference Result 49 states and 70 transitions.
[2021-11-07 01:28:01,023 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2021-11-07 01:28:01,024 INFO  L78                 Accepts]: Start accepts. Automaton has  has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14
[2021-11-07 01:28:01,024 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2021-11-07 01:28:01,024 INFO  L225             Difference]: With dead ends: 49
[2021-11-07 01:28:01,024 INFO  L226             Difference]: Without dead ends: 33
[2021-11-07 01:28:01,025 INFO  L786         BasicCegarLoop]: 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
[2021-11-07 01:28:01,025 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 33 states.
[2021-11-07 01:28:01,029 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 27.
[2021-11-07 01:28:01,029 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 27 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2021-11-07 01:28:01,029 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 37 transitions.
[2021-11-07 01:28:01,030 INFO  L78                 Accepts]: Start accepts. Automaton has 27 states and 37 transitions. Word has length 14
[2021-11-07 01:28:01,030 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2021-11-07 01:28:01,030 INFO  L470      AbstractCegarLoop]: Abstraction has 27 states and 37 transitions.
[2021-11-07 01:28:01,030 INFO  L471      AbstractCegarLoop]: INTERPOLANT automaton has  has 4 states, 4 states have (on average 3.5) internal successors, (14), 3 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2021-11-07 01:28:01,030 INFO  L276                IsEmpty]: Start isEmpty. Operand 27 states and 37 transitions.
[2021-11-07 01:28:01,031 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 16
[2021-11-07 01:28:01,031 INFO  L505         BasicCegarLoop]: Found error trace
[2021-11-07 01:28:01,031 INFO  L513         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2021-11-07 01:28:01,031 WARN  L452      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2021-11-07 01:28:01,031 INFO  L402      AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2021-11-07 01:28:01,032 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2021-11-07 01:28:01,032 INFO  L85        PathProgramCache]: Analyzing trace with hash 2121055650, now seen corresponding path program 1 times
[2021-11-07 01:28:01,032 INFO  L121   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2021-11-07 01:28:01,032 INFO  L332   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2009287550]
[2021-11-07 01:28:01,033 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2021-11-07 01:28:01,033 INFO  L126          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2021-11-07 01:28:01,061 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2021-11-07 01:28:01,118 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2021-11-07 01:28:01,118 INFO  L139   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2021-11-07 01:28:01,118 INFO  L332   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2009287550]
[2021-11-07 01:28:01,119 INFO  L160   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2009287550] provided 1 perfect and 0 imperfect interpolant sequences
[2021-11-07 01:28:01,119 INFO  L186   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2021-11-07 01:28:01,119 INFO  L199   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2021-11-07 01:28:01,119 INFO  L115   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095390183]
[2021-11-07 01:28:01,120 INFO  L546      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2021-11-07 01:28:01,120 INFO  L103   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2021-11-07 01:28:01,120 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2021-11-07 01:28:01,120 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2021-11-07 01:28:01,121 INFO  L87              Difference]: Start difference. First operand 27 states and 37 transitions. Second operand  has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2021-11-07 01:28:01,262 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2021-11-07 01:28:01,262 INFO  L93              Difference]: Finished difference Result 71 states and 106 transitions.
[2021-11-07 01:28:01,263 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2021-11-07 01:28:01,263 INFO  L78                 Accepts]: Start accepts. Automaton has  has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15
[2021-11-07 01:28:01,263 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2021-11-07 01:28:01,264 INFO  L225             Difference]: With dead ends: 71
[2021-11-07 01:28:01,264 INFO  L226             Difference]: Without dead ends: 55
[2021-11-07 01:28:01,265 INFO  L786         BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56
[2021-11-07 01:28:01,265 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 55 states.
[2021-11-07 01:28:01,270 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 32.
[2021-11-07 01:28:01,270 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 32 states, 31 states have (on average 1.3548387096774193) internal successors, (42), 31 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2021-11-07 01:28:01,271 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 42 transitions.
[2021-11-07 01:28:01,271 INFO  L78                 Accepts]: Start accepts. Automaton has 32 states and 42 transitions. Word has length 15
[2021-11-07 01:28:01,271 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2021-11-07 01:28:01,272 INFO  L470      AbstractCegarLoop]: Abstraction has 32 states and 42 transitions.
[2021-11-07 01:28:01,272 INFO  L471      AbstractCegarLoop]: INTERPOLANT automaton has  has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2021-11-07 01:28:01,272 INFO  L276                IsEmpty]: Start isEmpty. Operand 32 states and 42 transitions.
[2021-11-07 01:28:01,273 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 20
[2021-11-07 01:28:01,273 INFO  L505         BasicCegarLoop]: Found error trace
[2021-11-07 01:28:01,273 INFO  L513         BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2021-11-07 01:28:01,273 WARN  L452      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6
[2021-11-07 01:28:01,273 INFO  L402      AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2021-11-07 01:28:01,274 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2021-11-07 01:28:01,274 INFO  L85        PathProgramCache]: Analyzing trace with hash -322803980, now seen corresponding path program 1 times
[2021-11-07 01:28:01,274 INFO  L121   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2021-11-07 01:28:01,274 INFO  L332   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1186833208]
[2021-11-07 01:28:01,275 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2021-11-07 01:28:01,275 INFO  L126          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2021-11-07 01:28:01,680 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2021-11-07 01:28:02,183 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2021-11-07 01:28:02,183 INFO  L139   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2021-11-07 01:28:02,183 INFO  L332   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1186833208]
[2021-11-07 01:28:02,184 INFO  L160   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1186833208] provided 0 perfect and 1 imperfect interpolant sequences
[2021-11-07 01:28:02,184 INFO  L332   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1952085207]
[2021-11-07 01:28:02,184 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2021-11-07 01:28:02,184 INFO  L168          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2021-11-07 01:28:02,184 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8/z3
[2021-11-07 01:28:02,188 INFO  L229       MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2021-11-07 01:28:02,218 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_90b9408c-f9cb-4b68-bf11-2db4e585fe23/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process
[2021-11-07 01:28:02,420 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2021-11-07 01:28:02,424 INFO  L263         TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 22 conjunts are in the unsatisfiable core
[2021-11-07 01:28:02,450 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2021-11-07 01:28:20,552 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2021-11-07 01:28:20,552 INFO  L328         TraceCheckSpWp]: Computing backward predicates...