./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 0e0057cc
Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd91566b-c703-446a-92c1-a513271c0d97/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd91566b-c703-446a-92c1-a513271c0d97/bin/utaipan-verify-SwPr7d2a91/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd91566b-c703-446a-92c1-a513271c0d97/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd91566b-c703-446a-92c1-a513271c0d97/bin/utaipan-verify-SwPr7d2a91/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_fd91566b-c703-446a-92c1-a513271c0d97/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd91566b-c703-446a-92c1-a513271c0d97/bin/utaipan-verify-SwPr7d2a91 --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 0.2.4-dev-0e0057c
[2023-11-24 23:20:03,279 INFO  L188        SettingsManager]: Resetting all preferences to default values...
[2023-11-24 23:20:03,351 INFO  L114        SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd91566b-c703-446a-92c1-a513271c0d97/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf
[2023-11-24 23:20:03,355 WARN  L101        SettingsManager]: Preference file contains the following unknown settings:
[2023-11-24 23:20:03,356 WARN  L103        SettingsManager]:   * de.uni_freiburg.informatik.ultimate.core.Log level for class
[2023-11-24 23:20:03,382 INFO  L130        SettingsManager]: Preferences different from defaults after loading the file:
[2023-11-24 23:20:03,382 INFO  L151        SettingsManager]: Preferences of UltimateCore differ from their defaults:
[2023-11-24 23:20:03,383 INFO  L153        SettingsManager]:  * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR;
[2023-11-24 23:20:03,384 INFO  L151        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2023-11-24 23:20:03,384 INFO  L153        SettingsManager]:  * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS
[2023-11-24 23:20:03,385 INFO  L153        SettingsManager]:  * User list type=DISABLED
[2023-11-24 23:20:03,385 INFO  L151        SettingsManager]: Preferences of Abstract Interpretation differ from their defaults:
[2023-11-24 23:20:03,386 INFO  L153        SettingsManager]:  * Explicit value domain=true
[2023-11-24 23:20:03,387 INFO  L153        SettingsManager]:  * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain
[2023-11-24 23:20:03,387 INFO  L153        SettingsManager]:  * Octagon Domain=false
[2023-11-24 23:20:03,388 INFO  L153        SettingsManager]:  * Abstract domain=CompoundDomain
[2023-11-24 23:20:03,388 INFO  L153        SettingsManager]:  * Check feasibility of abstract posts with an SMT solver=true
[2023-11-24 23:20:03,389 INFO  L153        SettingsManager]:  * Use the RCFG-of-the-future interface=true
[2023-11-24 23:20:03,389 INFO  L153        SettingsManager]:  * Interval Domain=false
[2023-11-24 23:20:03,390 INFO  L151        SettingsManager]: Preferences of Sifa differ from their defaults:
[2023-11-24 23:20:03,390 INFO  L153        SettingsManager]:  * Call Summarizer=TopInputCallSummarizer
[2023-11-24 23:20:03,391 INFO  L153        SettingsManager]:  * Simplification Technique=POLY_PAC
[2023-11-24 23:20:03,392 INFO  L151        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2023-11-24 23:20:03,392 INFO  L153        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2023-11-24 23:20:03,393 INFO  L153        SettingsManager]:  * sizeof long=4
[2023-11-24 23:20:03,393 INFO  L153        SettingsManager]:  * Overapproximate operations on floating types=true
[2023-11-24 23:20:03,394 INFO  L153        SettingsManager]:  * sizeof POINTER=4
[2023-11-24 23:20:03,394 INFO  L153        SettingsManager]:  * Check division by zero=IGNORE
[2023-11-24 23:20:03,395 INFO  L153        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2023-11-24 23:20:03,395 INFO  L153        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2023-11-24 23:20:03,395 INFO  L153        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2023-11-24 23:20:03,396 INFO  L153        SettingsManager]:  * sizeof long double=12
[2023-11-24 23:20:03,396 INFO  L153        SettingsManager]:  * Check if freed pointer was valid=false
[2023-11-24 23:20:03,396 INFO  L153        SettingsManager]:  * Use constant arrays=true
[2023-11-24 23:20:03,397 INFO  L151        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2023-11-24 23:20:03,397 INFO  L153        SettingsManager]:  * Only consider context switches at boundaries of atomic blocks=true
[2023-11-24 23:20:03,397 INFO  L153        SettingsManager]:  * SMT solver=External_DefaultMode
[2023-11-24 23:20:03,398 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2023-11-24 23:20:03,398 INFO  L151        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2023-11-24 23:20:03,398 INFO  L153        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2023-11-24 23:20:03,398 INFO  L153        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopHeads
[2023-11-24 23:20:03,399 INFO  L153        SettingsManager]:  * Trace refinement strategy=SIFA_TAIPAN
[2023-11-24 23:20:03,399 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2023-11-24 23:20:03,399 INFO  L153        SettingsManager]:  * Apply one-shot large block encoding in concurrent analysis=false
[2023-11-24 23:20:03,399 INFO  L153        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2023-11-24 23:20:03,400 INFO  L153        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2023-11-24 23:20:03,400 INFO  L153        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
[2023-11-24 23:20:03,400 INFO  L153        SettingsManager]:  * Abstract interpretation Mode=USE_PREDICATES
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd91566b-c703-446a-92c1-a513271c0d97/bin/utaipan-verify-SwPr7d2a91/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_fd91566b-c703-446a-92c1-a513271c0d97/bin/utaipan-verify-SwPr7d2a91
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
[2023-11-24 23:20:03,696 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2023-11-24 23:20:03,730 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2023-11-24 23:20:03,732 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2023-11-24 23:20:03,735 INFO  L270        PluginConnector]: Initializing CDTParser...
[2023-11-24 23:20:03,735 INFO  L274        PluginConnector]: CDTParser initialized
[2023-11-24 23:20:03,736 INFO  L431   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd91566b-c703-446a-92c1-a513271c0d97/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/seq-mthreaded/pals_lcr.3_overflow.ufo.UNBOUNDED.pals.c
[2023-11-24 23:20:06,925 INFO  L533              CDTParser]: Created temporary CDT project at NULL
[2023-11-24 23:20:07,143 INFO  L384              CDTParser]: Found 1 translation units.
[2023-11-24 23:20:07,146 INFO  L180              CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd91566b-c703-446a-92c1-a513271c0d97/sv-benchmarks/c/seq-mthreaded/pals_lcr.3_overflow.ufo.UNBOUNDED.pals.c
[2023-11-24 23:20:07,162 INFO  L427              CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd91566b-c703-446a-92c1-a513271c0d97/bin/utaipan-verify-SwPr7d2a91/data/54e18a541/fb92fd4398604b9fabba5bfeefaed74e/FLAG08104ab4c
[2023-11-24 23:20:07,178 INFO  L435              CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd91566b-c703-446a-92c1-a513271c0d97/bin/utaipan-verify-SwPr7d2a91/data/54e18a541/fb92fd4398604b9fabba5bfeefaed74e
[2023-11-24 23:20:07,185 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2023-11-24 23:20:07,187 INFO  L133        ToolchainWalker]: Walking toolchain with 6 elements.
[2023-11-24 23:20:07,191 INFO  L112        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2023-11-24 23:20:07,192 INFO  L270        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2023-11-24 23:20:07,197 INFO  L274        PluginConnector]: CACSL2BoogieTranslator initialized
[2023-11-24 23:20:07,200 INFO  L184        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:20:07" (1/1) ...
[2023-11-24 23:20:07,201 INFO  L204        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@57e8868c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:20:07, skipping insertion in model container
[2023-11-24 23:20:07,201 INFO  L184        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:20:07" (1/1) ...
[2023-11-24 23:20:07,250 INFO  L177         MainTranslator]: Built tables and reachable declarations
[2023-11-24 23:20:07,578 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_fd91566b-c703-446a-92c1-a513271c0d97/sv-benchmarks/c/seq-mthreaded/pals_lcr.3_overflow.ufo.UNBOUNDED.pals.c[6117,6130]
[2023-11-24 23:20:07,583 INFO  L209          PostProcessor]: Analyzing one entry point: main
[2023-11-24 23:20:07,601 INFO  L202         MainTranslator]: Completed pre-run
[2023-11-24 23:20:07,675 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_fd91566b-c703-446a-92c1-a513271c0d97/sv-benchmarks/c/seq-mthreaded/pals_lcr.3_overflow.ufo.UNBOUNDED.pals.c[6117,6130]
[2023-11-24 23:20:07,675 INFO  L209          PostProcessor]: Analyzing one entry point: main
[2023-11-24 23:20:07,700 INFO  L206         MainTranslator]: Completed translation
[2023-11-24 23:20:07,700 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:20:07 WrapperNode
[2023-11-24 23:20:07,700 INFO  L131        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2023-11-24 23:20:07,702 INFO  L112        PluginConnector]: ------------------------Boogie Procedure Inliner----------------------------
[2023-11-24 23:20:07,702 INFO  L270        PluginConnector]: Initializing Boogie Procedure Inliner...
[2023-11-24 23:20:07,702 INFO  L274        PluginConnector]: Boogie Procedure Inliner initialized
[2023-11-24 23:20:07,710 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:20:07" (1/1) ...
[2023-11-24 23:20:07,734 INFO  L184        PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:20:07" (1/1) ...
[2023-11-24 23:20:07,776 INFO  L138                Inliner]: procedures = 23, calls = 14, calls flagged for inlining = 9, calls inlined = 9, statements flattened = 217
[2023-11-24 23:20:07,777 INFO  L131        PluginConnector]: ------------------------ END Boogie Procedure Inliner----------------------------
[2023-11-24 23:20:07,778 INFO  L112        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2023-11-24 23:20:07,778 INFO  L270        PluginConnector]: Initializing Boogie Preprocessor...
[2023-11-24 23:20:07,778 INFO  L274        PluginConnector]: Boogie Preprocessor initialized
[2023-11-24 23:20:07,790 INFO  L184        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:20:07" (1/1) ...
[2023-11-24 23:20:07,790 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:20:07" (1/1) ...
[2023-11-24 23:20:07,803 INFO  L184        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:20:07" (1/1) ...
[2023-11-24 23:20:07,803 INFO  L184        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:20:07" (1/1) ...
[2023-11-24 23:20:07,809 INFO  L184        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:20:07" (1/1) ...
[2023-11-24 23:20:07,830 INFO  L184        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:20:07" (1/1) ...
[2023-11-24 23:20:07,837 INFO  L184        PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:20:07" (1/1) ...
[2023-11-24 23:20:07,839 INFO  L184        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:20:07" (1/1) ...
[2023-11-24 23:20:07,842 INFO  L131        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2023-11-24 23:20:07,843 INFO  L112        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2023-11-24 23:20:07,843 INFO  L270        PluginConnector]: Initializing RCFGBuilder...
[2023-11-24 23:20:07,843 INFO  L274        PluginConnector]: RCFGBuilder initialized
[2023-11-24 23:20:07,844 INFO  L184        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:20:07" (1/1) ...
[2023-11-24 23:20:07,851 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2023-11-24 23:20:07,870 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd91566b-c703-446a-92c1-a513271c0d97/bin/utaipan-verify-SwPr7d2a91/z3
[2023-11-24 23:20:07,885 INFO  L229       MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd91566b-c703-446a-92c1-a513271c0d97/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
[2023-11-24 23:20:07,913 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd91566b-c703-446a-92c1-a513271c0d97/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process
[2023-11-24 23:20:07,930 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit
[2023-11-24 23:20:07,931 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int
[2023-11-24 23:20:07,931 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2023-11-24 23:20:07,933 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2023-11-24 23:20:08,018 INFO  L241             CfgBuilder]: Building ICFG
[2023-11-24 23:20:08,020 INFO  L267             CfgBuilder]: Building CFG for each procedure with an implementation
[2023-11-24 23:20:08,440 INFO  L282             CfgBuilder]: Performing block encoding
[2023-11-24 23:20:08,795 INFO  L304             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2023-11-24 23:20:08,795 INFO  L309             CfgBuilder]: Removed 1 assume(true) statements.
[2023-11-24 23:20:08,797 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:20:08 BoogieIcfgContainer
[2023-11-24 23:20:08,798 INFO  L131        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2023-11-24 23:20:08,802 INFO  L112        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2023-11-24 23:20:08,802 INFO  L270        PluginConnector]: Initializing TraceAbstraction...
[2023-11-24 23:20:08,806 INFO  L274        PluginConnector]: TraceAbstraction initialized
[2023-11-24 23:20:08,806 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 11:20:07" (1/3) ...
[2023-11-24 23:20:08,808 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79b2f612 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:20:08, skipping insertion in model container
[2023-11-24 23:20:08,808 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:20:07" (2/3) ...
[2023-11-24 23:20:08,811 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@79b2f612 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:20:08, skipping insertion in model container
[2023-11-24 23:20:08,811 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:20:08" (3/3) ...
[2023-11-24 23:20:08,813 INFO  L112   eAbstractionObserver]: Analyzing ICFG pals_lcr.3_overflow.ufo.UNBOUNDED.pals.c
[2023-11-24 23:20:08,836 INFO  L203   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2023-11-24 23:20:08,837 INFO  L162   ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations.
[2023-11-24 23:20:08,906 INFO  L356      AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ========
[2023-11-24 23:20:08,914 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;@7e291d8, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms]
[2023-11-24 23:20:08,917 INFO  L358      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2023-11-24 23:20:08,922 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)
[2023-11-24 23:20:08,930 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 7
[2023-11-24 23:20:08,931 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-24 23:20:08,932 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1]
[2023-11-24 23:20:08,932 INFO  L420      AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-24 23:20:08,942 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-24 23:20:08,942 INFO  L85        PathProgramCache]: Analyzing trace with hash 1728066456, now seen corresponding path program 1 times
[2023-11-24 23:20:08,951 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-24 23:20:08,952 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [277122359]
[2023-11-24 23:20:08,952 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-24 23:20:08,953 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-24 23:20:09,191 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-24 23:20:10,219 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-24 23:20:10,220 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-24 23:20:10,220 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [277122359]
[2023-11-24 23:20:10,221 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [277122359] provided 1 perfect and 0 imperfect interpolant sequences
[2023-11-24 23:20:10,221 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-11-24 23:20:10,222 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2023-11-24 23:20:10,223 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041013565]
[2023-11-24 23:20:10,224 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-24 23:20:10,229 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2023-11-24 23:20:10,229 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-24 23:20:10,282 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2023-11-24 23:20:10,283 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2023-11-24 23:20:10,286 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)
[2023-11-24 23:20:10,366 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-24 23:20:10,366 INFO  L93              Difference]: Finished difference Result 33 states and 48 transitions.
[2023-11-24 23:20:10,367 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2023-11-24 23:20:10,369 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
[2023-11-24 23:20:10,369 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-24 23:20:10,377 INFO  L225             Difference]: With dead ends: 33
[2023-11-24 23:20:10,377 INFO  L226             Difference]: Without dead ends: 22
[2023-11-24 23:20:10,381 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
[2023-11-24 23:20:10,388 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
[2023-11-24 23:20:10,390 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]
[2023-11-24 23:20:10,409 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 22 states.
[2023-11-24 23:20:10,429 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 13.
[2023-11-24 23:20:10,430 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)
[2023-11-24 23:20:10,431 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions.
[2023-11-24 23:20:10,433 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 6
[2023-11-24 23:20:10,434 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-24 23:20:10,435 INFO  L495      AbstractCegarLoop]: Abstraction has 13 states and 16 transitions.
[2023-11-24 23:20:10,435 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)
[2023-11-24 23:20:10,435 INFO  L276                IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions.
[2023-11-24 23:20:10,436 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 9
[2023-11-24 23:20:10,436 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-24 23:20:10,437 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-24 23:20:10,437 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2023-11-24 23:20:10,437 INFO  L420      AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-24 23:20:10,438 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-24 23:20:10,439 INFO  L85        PathProgramCache]: Analyzing trace with hash 2056687240, now seen corresponding path program 1 times
[2023-11-24 23:20:10,439 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-24 23:20:10,439 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1157131637]
[2023-11-24 23:20:10,439 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-24 23:20:10,440 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-24 23:20:10,496 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-24 23:20:10,789 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-24 23:20:10,790 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-24 23:20:10,791 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1157131637]
[2023-11-24 23:20:10,792 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1157131637] provided 1 perfect and 0 imperfect interpolant sequences
[2023-11-24 23:20:10,792 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-11-24 23:20:10,792 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2023-11-24 23:20:10,792 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931209923]
[2023-11-24 23:20:10,793 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-24 23:20:10,794 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2023-11-24 23:20:10,795 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-24 23:20:10,795 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2023-11-24 23:20:10,796 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2023-11-24 23:20:10,796 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)
[2023-11-24 23:20:10,855 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-24 23:20:10,855 INFO  L93              Difference]: Finished difference Result 32 states and 40 transitions.
[2023-11-24 23:20:10,855 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2023-11-24 23:20:10,856 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
[2023-11-24 23:20:10,856 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-24 23:20:10,857 INFO  L225             Difference]: With dead ends: 32
[2023-11-24 23:20:10,857 INFO  L226             Difference]: Without dead ends: 22
[2023-11-24 23:20:10,862 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
[2023-11-24 23:20:10,865 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
[2023-11-24 23:20:10,866 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]
[2023-11-24 23:20:10,869 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 22 states.
[2023-11-24 23:20:10,886 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 14.
[2023-11-24 23:20:10,887 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)
[2023-11-24 23:20:10,888 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions.
[2023-11-24 23:20:10,889 INFO  L78                 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 8
[2023-11-24 23:20:10,889 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-24 23:20:10,889 INFO  L495      AbstractCegarLoop]: Abstraction has 14 states and 17 transitions.
[2023-11-24 23:20:10,890 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)
[2023-11-24 23:20:10,890 INFO  L276                IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions.
[2023-11-24 23:20:10,891 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 9
[2023-11-24 23:20:10,892 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-24 23:20:10,892 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-24 23:20:10,893 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2023-11-24 23:20:10,893 INFO  L420      AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-24 23:20:10,903 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-24 23:20:10,903 INFO  L85        PathProgramCache]: Analyzing trace with hash 2056925568, now seen corresponding path program 1 times
[2023-11-24 23:20:10,904 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-24 23:20:10,904 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1714210349]
[2023-11-24 23:20:10,904 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-24 23:20:10,904 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-24 23:20:10,949 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-24 23:20:11,463 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-24 23:20:11,464 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-24 23:20:11,464 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1714210349]
[2023-11-24 23:20:11,465 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1714210349] provided 1 perfect and 0 imperfect interpolant sequences
[2023-11-24 23:20:11,466 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-11-24 23:20:11,466 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2023-11-24 23:20:11,467 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [794875557]
[2023-11-24 23:20:11,467 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-24 23:20:11,467 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2023-11-24 23:20:11,467 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-24 23:20:11,468 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2023-11-24 23:20:11,469 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2023-11-24 23:20:11,469 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)
[2023-11-24 23:20:11,521 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-24 23:20:11,521 INFO  L93              Difference]: Finished difference Result 32 states and 39 transitions.
[2023-11-24 23:20:11,522 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2023-11-24 23:20:11,522 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
[2023-11-24 23:20:11,522 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-24 23:20:11,523 INFO  L225             Difference]: With dead ends: 32
[2023-11-24 23:20:11,523 INFO  L226             Difference]: Without dead ends: 22
[2023-11-24 23:20:11,523 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
[2023-11-24 23:20:11,525 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
[2023-11-24 23:20:11,525 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]
[2023-11-24 23:20:11,526 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 22 states.
[2023-11-24 23:20:11,529 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 15.
[2023-11-24 23:20:11,529 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)
[2023-11-24 23:20:11,530 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions.
[2023-11-24 23:20:11,530 INFO  L78                 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 8
[2023-11-24 23:20:11,530 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-24 23:20:11,531 INFO  L495      AbstractCegarLoop]: Abstraction has 15 states and 18 transitions.
[2023-11-24 23:20:11,531 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)
[2023-11-24 23:20:11,531 INFO  L276                IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions.
[2023-11-24 23:20:11,531 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 10
[2023-11-24 23:20:11,531 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-24 23:20:11,532 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-24 23:20:11,532 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2023-11-24 23:20:11,532 INFO  L420      AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-24 23:20:11,532 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-24 23:20:11,533 INFO  L85        PathProgramCache]: Analyzing trace with hash -671954092, now seen corresponding path program 1 times
[2023-11-24 23:20:11,533 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-24 23:20:11,533 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071695090]
[2023-11-24 23:20:11,533 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-24 23:20:11,533 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-24 23:20:11,551 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-24 23:20:11,914 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-24 23:20:11,915 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-24 23:20:11,915 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071695090]
[2023-11-24 23:20:11,915 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1071695090] provided 1 perfect and 0 imperfect interpolant sequences
[2023-11-24 23:20:11,916 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-11-24 23:20:11,916 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2023-11-24 23:20:11,916 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725377332]
[2023-11-24 23:20:11,917 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-24 23:20:11,917 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2023-11-24 23:20:11,918 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-24 23:20:11,919 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2023-11-24 23:20:11,920 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2023-11-24 23:20:11,920 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)
[2023-11-24 23:20:12,011 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-24 23:20:12,011 INFO  L93              Difference]: Finished difference Result 27 states and 30 transitions.
[2023-11-24 23:20:12,011 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2023-11-24 23:20:12,012 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
[2023-11-24 23:20:12,012 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-24 23:20:12,014 INFO  L225             Difference]: With dead ends: 27
[2023-11-24 23:20:12,014 INFO  L226             Difference]: Without dead ends: 25
[2023-11-24 23:20:12,016 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42
[2023-11-24 23:20:12,025 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
[2023-11-24 23:20:12,026 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]
[2023-11-24 23:20:12,030 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 25 states.
[2023-11-24 23:20:12,036 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 18.
[2023-11-24 23:20:12,037 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)
[2023-11-24 23:20:12,038 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions.
[2023-11-24 23:20:12,039 INFO  L78                 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 9
[2023-11-24 23:20:12,039 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-24 23:20:12,039 INFO  L495      AbstractCegarLoop]: Abstraction has 18 states and 21 transitions.
[2023-11-24 23:20:12,039 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)
[2023-11-24 23:20:12,040 INFO  L276                IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions.
[2023-11-24 23:20:12,040 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 15
[2023-11-24 23:20:12,040 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-24 23:20:12,041 INFO  L195           NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-24 23:20:12,041 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2023-11-24 23:20:12,041 INFO  L420      AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-24 23:20:12,042 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-24 23:20:12,043 INFO  L85        PathProgramCache]: Analyzing trace with hash 1736293923, now seen corresponding path program 1 times
[2023-11-24 23:20:12,043 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-24 23:20:12,043 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [547557701]
[2023-11-24 23:20:12,044 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-24 23:20:12,044 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-24 23:20:12,169 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-24 23:20:16,113 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-24 23:20:16,113 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-24 23:20:16,113 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [547557701]
[2023-11-24 23:20:16,113 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [547557701] provided 0 perfect and 1 imperfect interpolant sequences
[2023-11-24 23:20:16,114 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [782631515]
[2023-11-24 23:20:16,114 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-24 23:20:16,114 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-24 23:20:16,114 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd91566b-c703-446a-92c1-a513271c0d97/bin/utaipan-verify-SwPr7d2a91/z3
[2023-11-24 23:20:16,120 INFO  L229       MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd91566b-c703-446a-92c1-a513271c0d97/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-11-24 23:20:16,126 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd91566b-c703-446a-92c1-a513271c0d97/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process
[2023-11-24 23:20:16,273 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-24 23:20:16,276 INFO  L262         TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 30 conjunts are in the unsatisfiable core
[2023-11-24 23:20:16,290 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-11-24 23:20:19,761 INFO  L134       CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-24 23:20:19,761 INFO  L327         TraceCheckSpWp]: Computing backward predicates...