./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.3_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_47dde6e8-628f-44d3-bacb-00ad30970af6/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47dde6e8-628f-44d3-bacb-00ad30970af6/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_47dde6e8-628f-44d3-bacb-00ad30970af6/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47dde6e8-628f-44d3-bacb-00ad30970af6/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_lcr.3_overflow.ufo.UNBOUNDED.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47dde6e8-628f-44d3-bacb-00ad30970af6/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_47dde6e8-628f-44d3-bacb-00ad30970af6/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 e5878b7d2af5fd4b66050c0dbed52215fb6ea8477622dc26391a98be7bc7f1ca
--- Real Ultimate output ---
This is Ultimate 0.2.3-dev-30e01a7
[2023-11-23 20:31:53,407 INFO  L188        SettingsManager]: Resetting all preferences to default values...
[2023-11-23 20:31:53,491 INFO  L114        SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47dde6e8-628f-44d3-bacb-00ad30970af6/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf
[2023-11-23 20:31:53,506 WARN  L101        SettingsManager]: Preference file contains the following unknown settings:
[2023-11-23 20:31:53,507 WARN  L103        SettingsManager]:   * de.uni_freiburg.informatik.ultimate.core.Log level for class
[2023-11-23 20:31:53,565 INFO  L130        SettingsManager]: Preferences different from defaults after loading the file:
[2023-11-23 20:31:53,566 INFO  L151        SettingsManager]: Preferences of UltimateCore differ from their defaults:
[2023-11-23 20:31:53,567 INFO  L153        SettingsManager]:  * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR;
[2023-11-23 20:31:53,568 INFO  L151        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2023-11-23 20:31:53,573 INFO  L153        SettingsManager]:  * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS
[2023-11-23 20:31:53,574 INFO  L153        SettingsManager]:  * User list type=DISABLED
[2023-11-23 20:31:53,575 INFO  L151        SettingsManager]: Preferences of Abstract Interpretation differ from their defaults:
[2023-11-23 20:31:53,576 INFO  L153        SettingsManager]:  * Explicit value domain=true
[2023-11-23 20:31:53,578 INFO  L153        SettingsManager]:  * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain
[2023-11-23 20:31:53,578 INFO  L153        SettingsManager]:  * Octagon Domain=false
[2023-11-23 20:31:53,579 INFO  L153        SettingsManager]:  * Abstract domain=CompoundDomain
[2023-11-23 20:31:53,579 INFO  L153        SettingsManager]:  * Check feasibility of abstract posts with an SMT solver=true
[2023-11-23 20:31:53,579 INFO  L153        SettingsManager]:  * Use the RCFG-of-the-future interface=true
[2023-11-23 20:31:53,580 INFO  L153        SettingsManager]:  * Interval Domain=false
[2023-11-23 20:31:53,580 INFO  L151        SettingsManager]: Preferences of Sifa differ from their defaults:
[2023-11-23 20:31:53,581 INFO  L153        SettingsManager]:  * Call Summarizer=TopInputCallSummarizer
[2023-11-23 20:31:53,581 INFO  L153        SettingsManager]:  * Simplification Technique=POLY_PAC
[2023-11-23 20:31:53,583 INFO  L151        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2023-11-23 20:31:53,583 INFO  L153        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2023-11-23 20:31:53,584 INFO  L153        SettingsManager]:  * sizeof long=4
[2023-11-23 20:31:53,584 INFO  L153        SettingsManager]:  * Overapproximate operations on floating types=true
[2023-11-23 20:31:53,585 INFO  L153        SettingsManager]:  * sizeof POINTER=4
[2023-11-23 20:31:53,585 INFO  L153        SettingsManager]:  * Check division by zero=IGNORE
[2023-11-23 20:31:53,586 INFO  L153        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2023-11-23 20:31:53,586 INFO  L153        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2023-11-23 20:31:53,588 INFO  L153        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2023-11-23 20:31:53,588 INFO  L153        SettingsManager]:  * sizeof long double=12
[2023-11-23 20:31:53,589 INFO  L153        SettingsManager]:  * Check if freed pointer was valid=false
[2023-11-23 20:31:53,589 INFO  L153        SettingsManager]:  * Use constant arrays=true
[2023-11-23 20:31:53,589 INFO  L151        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2023-11-23 20:31:53,590 INFO  L153        SettingsManager]:  * Only consider context switches at boundaries of atomic blocks=true
[2023-11-23 20:31:53,590 INFO  L153        SettingsManager]:  * SMT solver=External_DefaultMode
[2023-11-23 20:31:53,590 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2023-11-23 20:31:53,590 INFO  L151        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2023-11-23 20:31:53,591 INFO  L153        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2023-11-23 20:31:53,592 INFO  L153        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopHeads
[2023-11-23 20:31:53,592 INFO  L153        SettingsManager]:  * Trace refinement strategy=SIFA_TAIPAN
[2023-11-23 20:31:53,593 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2023-11-23 20:31:53,593 INFO  L153        SettingsManager]:  * Apply one-shot large block encoding in concurrent analysis=false
[2023-11-23 20:31:53,594 INFO  L153        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2023-11-23 20:31:53,594 INFO  L153        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2023-11-23 20:31:53,594 INFO  L153        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
[2023-11-23 20:31:53,594 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_47dde6e8-628f-44d3-bacb-00ad30970af6/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_47dde6e8-628f-44d3-bacb-00ad30970af6/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 -> e5878b7d2af5fd4b66050c0dbed52215fb6ea8477622dc26391a98be7bc7f1ca
[2023-11-23 20:31:53,866 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2023-11-23 20:31:53,899 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2023-11-23 20:31:53,902 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2023-11-23 20:31:53,904 INFO  L270        PluginConnector]: Initializing CDTParser...
[2023-11-23 20:31:53,905 INFO  L274        PluginConnector]: CDTParser initialized
[2023-11-23 20:31:53,906 INFO  L431   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47dde6e8-628f-44d3-bacb-00ad30970af6/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.3_overflow.ufo.UNBOUNDED.pals.c
[2023-11-23 20:31:57,135 INFO  L533              CDTParser]: Created temporary CDT project at NULL
[2023-11-23 20:31:57,479 INFO  L384              CDTParser]: Found 1 translation units.
[2023-11-23 20:31:57,481 INFO  L180              CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47dde6e8-628f-44d3-bacb-00ad30970af6/sv-benchmarks/c/seq-mthreaded/pals_lcr.3_overflow.ufo.UNBOUNDED.pals.c
[2023-11-23 20:31:57,496 INFO  L427              CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47dde6e8-628f-44d3-bacb-00ad30970af6/bin/utaipan-verify-mE87zJ7Ire/data/f47060627/936a2edd374843ac9d9c0cd01caefc36/FLAGe18e41f03
[2023-11-23 20:31:57,762 INFO  L435              CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47dde6e8-628f-44d3-bacb-00ad30970af6/bin/utaipan-verify-mE87zJ7Ire/data/f47060627/936a2edd374843ac9d9c0cd01caefc36
[2023-11-23 20:31:57,765 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2023-11-23 20:31:57,767 INFO  L133        ToolchainWalker]: Walking toolchain with 6 elements.
[2023-11-23 20:31:57,772 INFO  L112        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2023-11-23 20:31:57,773 INFO  L270        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2023-11-23 20:31:57,781 INFO  L274        PluginConnector]: CACSL2BoogieTranslator initialized
[2023-11-23 20:31:57,782 INFO  L184        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:31:57" (1/1) ...
[2023-11-23 20:31:57,783 INFO  L204        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39179195 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:57, skipping insertion in model container
[2023-11-23 20:31:57,784 INFO  L184        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:31:57" (1/1) ...
[2023-11-23 20:31:57,830 INFO  L177         MainTranslator]: Built tables and reachable declarations
[2023-11-23 20:31:58,029 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_47dde6e8-628f-44d3-bacb-00ad30970af6/sv-benchmarks/c/seq-mthreaded/pals_lcr.3_overflow.ufo.UNBOUNDED.pals.c[6117,6130]
[2023-11-23 20:31:58,033 INFO  L209          PostProcessor]: Analyzing one entry point: main
[2023-11-23 20:31:58,050 INFO  L202         MainTranslator]: Completed pre-run
[2023-11-23 20:31:58,093 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_47dde6e8-628f-44d3-bacb-00ad30970af6/sv-benchmarks/c/seq-mthreaded/pals_lcr.3_overflow.ufo.UNBOUNDED.pals.c[6117,6130]
[2023-11-23 20:31:58,101 INFO  L209          PostProcessor]: Analyzing one entry point: main
[2023-11-23 20:31:58,117 INFO  L206         MainTranslator]: Completed translation
[2023-11-23 20:31:58,118 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:58 WrapperNode
[2023-11-23 20:31:58,118 INFO  L131        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2023-11-23 20:31:58,119 INFO  L112        PluginConnector]: ------------------------Boogie Procedure Inliner----------------------------
[2023-11-23 20:31:58,119 INFO  L270        PluginConnector]: Initializing Boogie Procedure Inliner...
[2023-11-23 20:31:58,119 INFO  L274        PluginConnector]: Boogie Procedure Inliner initialized
[2023-11-23 20:31:58,127 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:58" (1/1) ...
[2023-11-23 20:31:58,141 INFO  L184        PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:58" (1/1) ...
[2023-11-23 20:31:58,172 INFO  L138                Inliner]: procedures = 23, calls = 14, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 217
[2023-11-23 20:31:58,172 INFO  L131        PluginConnector]: ------------------------ END Boogie Procedure Inliner----------------------------
[2023-11-23 20:31:58,173 INFO  L112        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2023-11-23 20:31:58,173 INFO  L270        PluginConnector]: Initializing Boogie Preprocessor...
[2023-11-23 20:31:58,173 INFO  L274        PluginConnector]: Boogie Preprocessor initialized
[2023-11-23 20:31:58,183 INFO  L184        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:58" (1/1) ...
[2023-11-23 20:31:58,183 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:58" (1/1) ...
[2023-11-23 20:31:58,186 INFO  L184        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:58" (1/1) ...
[2023-11-23 20:31:58,186 INFO  L184        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:58" (1/1) ...
[2023-11-23 20:31:58,194 INFO  L184        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:58" (1/1) ...
[2023-11-23 20:31:58,200 INFO  L184        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:58" (1/1) ...
[2023-11-23 20:31:58,202 INFO  L184        PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:58" (1/1) ...
[2023-11-23 20:31:58,203 INFO  L184        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:58" (1/1) ...
[2023-11-23 20:31:58,207 INFO  L131        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2023-11-23 20:31:58,208 INFO  L112        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2023-11-23 20:31:58,208 INFO  L270        PluginConnector]: Initializing RCFGBuilder...
[2023-11-23 20:31:58,208 INFO  L274        PluginConnector]: RCFGBuilder initialized
[2023-11-23 20:31:58,209 INFO  L184        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:58" (1/1) ...
[2023-11-23 20:31:58,215 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2023-11-23 20:31:58,230 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47dde6e8-628f-44d3-bacb-00ad30970af6/bin/utaipan-verify-mE87zJ7Ire/z3
[2023-11-23 20:31:58,242 INFO  L229       MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47dde6e8-628f-44d3-bacb-00ad30970af6/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
[2023-11-23 20:31:58,268 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47dde6e8-628f-44d3-bacb-00ad30970af6/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process
[2023-11-23 20:31:58,286 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit
[2023-11-23 20:31:58,286 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int
[2023-11-23 20:31:58,286 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2023-11-23 20:31:58,286 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2023-11-23 20:31:58,361 INFO  L241             CfgBuilder]: Building ICFG
[2023-11-23 20:31:58,364 INFO  L267             CfgBuilder]: Building CFG for each procedure with an implementation
[2023-11-23 20:31:58,691 INFO  L282             CfgBuilder]: Performing block encoding
[2023-11-23 20:31:59,122 INFO  L304             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2023-11-23 20:31:59,123 INFO  L309             CfgBuilder]: Removed 1 assume(true) statements.
[2023-11-23 20:31:59,125 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:31:59 BoogieIcfgContainer
[2023-11-23 20:31:59,125 INFO  L131        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2023-11-23 20:31:59,129 INFO  L112        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2023-11-23 20:31:59,129 INFO  L270        PluginConnector]: Initializing TraceAbstraction...
[2023-11-23 20:31:59,134 INFO  L274        PluginConnector]: TraceAbstraction initialized
[2023-11-23 20:31:59,134 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:31:57" (1/3) ...
[2023-11-23 20:31:59,135 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@516895c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:31:59, skipping insertion in model container
[2023-11-23 20:31:59,136 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:31:58" (2/3) ...
[2023-11-23 20:31:59,138 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@516895c6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:31:59, skipping insertion in model container
[2023-11-23 20:31:59,139 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:31:59" (3/3) ...
[2023-11-23 20:31:59,141 INFO  L112   eAbstractionObserver]: Analyzing ICFG pals_lcr.3_overflow.ufo.UNBOUNDED.pals.c
[2023-11-23 20:31:59,163 INFO  L203   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2023-11-23 20:31:59,163 INFO  L162   ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations.
[2023-11-23 20:31:59,219 INFO  L356      AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ========
[2023-11-23 20:31:59,226 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;@5a9a1d82, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms]
[2023-11-23 20:31:59,227 INFO  L358      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2023-11-23 20:31:59,233 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 20:31:59,241 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 7
[2023-11-23 20:31:59,241 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-23 20:31:59,242 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1]
[2023-11-23 20:31:59,242 INFO  L420      AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-23 20:31:59,248 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-23 20:31:59,248 INFO  L85        PathProgramCache]: Analyzing trace with hash 1728066456, now seen corresponding path program 1 times
[2023-11-23 20:31:59,257 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-23 20:31:59,258 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679636398]
[2023-11-23 20:31:59,258 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 20:31:59,259 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-23 20:31:59,516 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 20:32:00,522 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 20:32:00,523 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-23 20:32:00,523 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679636398]
[2023-11-23 20:32:00,524 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1679636398] provided 1 perfect and 0 imperfect interpolant sequences
[2023-11-23 20:32:00,524 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-11-23 20:32:00,525 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2023-11-23 20:32:00,528 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790859117]
[2023-11-23 20:32:00,529 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-23 20:32:00,533 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2023-11-23 20:32:00,533 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-23 20:32:00,583 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2023-11-23 20:32:00,584 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2023-11-23 20:32:00,587 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 20:32:00,668 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-23 20:32:00,668 INFO  L93              Difference]: Finished difference Result 33 states and 48 transitions.
[2023-11-23 20:32:00,670 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2023-11-23 20:32:00,671 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 20:32:00,672 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-23 20:32:00,680 INFO  L225             Difference]: With dead ends: 33
[2023-11-23 20:32:00,680 INFO  L226             Difference]: Without dead ends: 22
[2023-11-23 20:32:00,683 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 20:32:00,690 INFO  L413           NwaCegarLoop]: 7 mSDtfsCounter, 11 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s 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 20:32:00,692 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 20:32:00,710 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 22 states.
[2023-11-23 20:32:00,728 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 13.
[2023-11-23 20:32:00,730 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 20:32:00,730 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions.
[2023-11-23 20:32:00,733 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 6
[2023-11-23 20:32:00,733 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-23 20:32:00,734 INFO  L495      AbstractCegarLoop]: Abstraction has 13 states and 16 transitions.
[2023-11-23 20:32:00,734 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 20:32:00,734 INFO  L276                IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions.
[2023-11-23 20:32:00,735 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 9
[2023-11-23 20:32:00,735 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-23 20:32:00,736 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-23 20:32:00,736 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2023-11-23 20:32:00,736 INFO  L420      AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-23 20:32:00,738 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-23 20:32:00,738 INFO  L85        PathProgramCache]: Analyzing trace with hash 2056687240, now seen corresponding path program 1 times
[2023-11-23 20:32:00,739 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-23 20:32:00,739 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479760793]
[2023-11-23 20:32:00,739 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 20:32:00,740 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-23 20:32:00,792 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 20:32:01,104 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 20:32:01,104 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-23 20:32:01,104 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479760793]
[2023-11-23 20:32:01,106 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479760793] provided 1 perfect and 0 imperfect interpolant sequences
[2023-11-23 20:32:01,106 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-11-23 20:32:01,106 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2023-11-23 20:32:01,106 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536184226]
[2023-11-23 20:32:01,107 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-23 20:32:01,108 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2023-11-23 20:32:01,109 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-23 20:32:01,110 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2023-11-23 20:32:01,110 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2023-11-23 20:32:01,110 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 20:32:01,166 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-23 20:32:01,166 INFO  L93              Difference]: Finished difference Result 32 states and 40 transitions.
[2023-11-23 20:32:01,166 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2023-11-23 20:32:01,167 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 20:32:01,167 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-23 20:32:01,168 INFO  L225             Difference]: With dead ends: 32
[2023-11-23 20:32:01,168 INFO  L226             Difference]: Without dead ends: 22
[2023-11-23 20:32:01,173 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 20:32:01,176 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 20:32:01,176 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 20:32:01,179 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 22 states.
[2023-11-23 20:32:01,186 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 14.
[2023-11-23 20:32:01,187 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 20:32:01,187 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions.
[2023-11-23 20:32:01,188 INFO  L78                 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 8
[2023-11-23 20:32:01,188 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-23 20:32:01,188 INFO  L495      AbstractCegarLoop]: Abstraction has 14 states and 17 transitions.
[2023-11-23 20:32:01,189 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 20:32:01,189 INFO  L276                IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions.
[2023-11-23 20:32:01,190 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 9
[2023-11-23 20:32:01,190 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-23 20:32:01,191 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-23 20:32:01,191 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2023-11-23 20:32:01,192 INFO  L420      AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-23 20:32:01,198 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-23 20:32:01,203 INFO  L85        PathProgramCache]: Analyzing trace with hash 2056925568, now seen corresponding path program 1 times
[2023-11-23 20:32:01,203 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-23 20:32:01,204 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530500167]
[2023-11-23 20:32:01,204 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 20:32:01,204 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-23 20:32:01,238 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 20:32:01,763 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 20:32:01,763 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-23 20:32:01,764 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530500167]
[2023-11-23 20:32:01,764 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530500167] provided 1 perfect and 0 imperfect interpolant sequences
[2023-11-23 20:32:01,765 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-11-23 20:32:01,765 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2023-11-23 20:32:01,766 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172889756]
[2023-11-23 20:32:01,766 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-23 20:32:01,767 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2023-11-23 20:32:01,767 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-23 20:32:01,768 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2023-11-23 20:32:01,769 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2023-11-23 20:32:01,770 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 20:32:01,820 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-23 20:32:01,821 INFO  L93              Difference]: Finished difference Result 32 states and 39 transitions.
[2023-11-23 20:32:01,821 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2023-11-23 20:32:01,822 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 20:32:01,822 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-23 20:32:01,823 INFO  L225             Difference]: With dead ends: 32
[2023-11-23 20:32:01,824 INFO  L226             Difference]: Without dead ends: 22
[2023-11-23 20:32:01,830 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 20:32:01,836 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 20:32:01,836 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 20:32:01,837 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 22 states.
[2023-11-23 20:32:01,840 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 15.
[2023-11-23 20:32:01,840 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 20:32:01,841 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions.
[2023-11-23 20:32:01,841 INFO  L78                 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 8
[2023-11-23 20:32:01,842 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-23 20:32:01,842 INFO  L495      AbstractCegarLoop]: Abstraction has 15 states and 18 transitions.
[2023-11-23 20:32:01,842 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 20:32:01,842 INFO  L276                IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions.
[2023-11-23 20:32:01,843 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 10
[2023-11-23 20:32:01,843 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-23 20:32:01,843 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-23 20:32:01,843 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2023-11-23 20:32:01,844 INFO  L420      AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-23 20:32:01,844 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-23 20:32:01,844 INFO  L85        PathProgramCache]: Analyzing trace with hash -671954092, now seen corresponding path program 1 times
[2023-11-23 20:32:01,845 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-23 20:32:01,845 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626828056]
[2023-11-23 20:32:01,845 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 20:32:01,845 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-23 20:32:01,866 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 20:32:02,282 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 20:32:02,282 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-23 20:32:02,283 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626828056]
[2023-11-23 20:32:02,283 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [626828056] provided 1 perfect and 0 imperfect interpolant sequences
[2023-11-23 20:32:02,283 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-11-23 20:32:02,283 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2023-11-23 20:32:02,283 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1779929493]
[2023-11-23 20:32:02,284 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-23 20:32:02,285 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2023-11-23 20:32:02,286 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-23 20:32:02,287 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2023-11-23 20:32:02,287 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2023-11-23 20:32:02,287 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 20:32:02,363 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-23 20:32:02,363 INFO  L93              Difference]: Finished difference Result 27 states and 30 transitions.
[2023-11-23 20:32:02,364 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2023-11-23 20:32:02,364 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 20:32:02,365 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-23 20:32:02,366 INFO  L225             Difference]: With dead ends: 27
[2023-11-23 20:32:02,366 INFO  L226             Difference]: Without dead ends: 25
[2023-11-23 20:32:02,368 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 20:32:02,375 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 20:32:02,377 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 20:32:02,379 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 25 states.
[2023-11-23 20:32:02,389 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 18.
[2023-11-23 20:32:02,389 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 20:32:02,390 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions.
[2023-11-23 20:32:02,391 INFO  L78                 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 9
[2023-11-23 20:32:02,391 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-23 20:32:02,391 INFO  L495      AbstractCegarLoop]: Abstraction has 18 states and 21 transitions.
[2023-11-23 20:32:02,391 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 20:32:02,392 INFO  L276                IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions.
[2023-11-23 20:32:02,393 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 15
[2023-11-23 20:32:02,393 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-23 20:32:02,393 INFO  L195           NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-23 20:32:02,393 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2023-11-23 20:32:02,394 INFO  L420      AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-23 20:32:02,395 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-23 20:32:02,395 INFO  L85        PathProgramCache]: Analyzing trace with hash 1736293923, now seen corresponding path program 1 times
[2023-11-23 20:32:02,396 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-23 20:32:02,396 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1246120865]
[2023-11-23 20:32:02,396 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 20:32:02,396 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-23 20:32:02,505 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 20:32:06,674 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 20:32:06,674 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-23 20:32:06,674 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1246120865]
[2023-11-23 20:32:06,674 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1246120865] provided 0 perfect and 1 imperfect interpolant sequences
[2023-11-23 20:32:06,675 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1031834018]
[2023-11-23 20:32:06,675 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-23 20:32:06,675 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-23 20:32:06,675 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47dde6e8-628f-44d3-bacb-00ad30970af6/bin/utaipan-verify-mE87zJ7Ire/z3
[2023-11-23 20:32:06,677 INFO  L229       MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47dde6e8-628f-44d3-bacb-00ad30970af6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-11-23 20:32:06,704 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_47dde6e8-628f-44d3-bacb-00ad30970af6/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process
[2023-11-23 20:32:06,831 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-23 20:32:06,834 INFO  L262         TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 29 conjunts are in the unsatisfiable core
[2023-11-23 20:32:06,848 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-11-23 20:32:10,830 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 20:32:10,830 INFO  L327         TraceCheckSpWp]: Computing backward predicates...