./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-lopstr16/single_elem_safe.i --full-output --architecture 32bit


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


Checking for ERROR reachability
Using default analysis
Version 527bcce2
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_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/config/AutomizerReach.xml -i ../../sv-benchmarks/c/array-lopstr16/single_elem_safe.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx --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 Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash f1aed9bc44add9424c35127ba8c0166402387241540742ea765fb4b7385c8271
--- Real Ultimate output ---
This is Ultimate 0.2.3-dev-527bcce
[2023-11-21 21:02:29,557 INFO  L188        SettingsManager]: Resetting all preferences to default values...
[2023-11-21 21:02:29,664 INFO  L114        SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/config/svcomp-Reach-32bit-Automizer_Default.epf
[2023-11-21 21:02:29,670 WARN  L101        SettingsManager]: Preference file contains the following unknown settings:
[2023-11-21 21:02:29,674 WARN  L103        SettingsManager]:   * de.uni_freiburg.informatik.ultimate.core.Log level for class
[2023-11-21 21:02:29,712 INFO  L130        SettingsManager]: Preferences different from defaults after loading the file:
[2023-11-21 21:02:29,712 INFO  L151        SettingsManager]: Preferences of UltimateCore differ from their defaults:
[2023-11-21 21:02:29,713 INFO  L153        SettingsManager]:  * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR;
[2023-11-21 21:02:29,714 INFO  L151        SettingsManager]: Preferences of Boogie Preprocessor differ from their defaults:
[2023-11-21 21:02:29,722 INFO  L153        SettingsManager]:  * Use memory slicer=true
[2023-11-21 21:02:29,722 INFO  L151        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2023-11-21 21:02:29,723 INFO  L153        SettingsManager]:  * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS
[2023-11-21 21:02:29,723 INFO  L151        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2023-11-21 21:02:29,725 INFO  L153        SettingsManager]:  * Create parallel compositions if possible=false
[2023-11-21 21:02:29,726 INFO  L153        SettingsManager]:  * Use SBE=true
[2023-11-21 21:02:29,726 INFO  L151        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2023-11-21 21:02:29,727 INFO  L153        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2023-11-21 21:02:29,727 INFO  L153        SettingsManager]:  * sizeof long=4
[2023-11-21 21:02:29,728 INFO  L153        SettingsManager]:  * Overapproximate operations on floating types=true
[2023-11-21 21:02:29,728 INFO  L153        SettingsManager]:  * sizeof POINTER=4
[2023-11-21 21:02:29,728 INFO  L153        SettingsManager]:  * Check division by zero=IGNORE
[2023-11-21 21:02:29,729 INFO  L153        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2023-11-21 21:02:29,729 INFO  L153        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2023-11-21 21:02:29,730 INFO  L153        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2023-11-21 21:02:29,730 INFO  L153        SettingsManager]:  * sizeof long double=12
[2023-11-21 21:02:29,730 INFO  L153        SettingsManager]:  * Check if freed pointer was valid=false
[2023-11-21 21:02:29,731 INFO  L153        SettingsManager]:  * Use constant arrays=true
[2023-11-21 21:02:29,732 INFO  L151        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2023-11-21 21:02:29,732 INFO  L153        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2023-11-21 21:02:29,732 INFO  L153        SettingsManager]:  * Only consider context switches at boundaries of atomic blocks=true
[2023-11-21 21:02:29,734 INFO  L153        SettingsManager]:  * SMT solver=External_DefaultMode
[2023-11-21 21:02:29,734 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2023-11-21 21:02:29,734 INFO  L151        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2023-11-21 21:02:29,734 INFO  L153        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2023-11-21 21:02:29,735 INFO  L153        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopHeads
[2023-11-21 21:02:29,735 INFO  L153        SettingsManager]:  * Trace refinement strategy=CAMEL
[2023-11-21 21:02:29,735 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2023-11-21 21:02:29,735 INFO  L153        SettingsManager]:  * Apply one-shot large block encoding in concurrent analysis=false
[2023-11-21 21:02:29,735 INFO  L153        SettingsManager]:  * Automaton type used in concurrency analysis=PETRI_NET
[2023-11-21 21:02:29,736 INFO  L153        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2023-11-21 21:02:29,736 INFO  L153        SettingsManager]:  * Order on configurations for Petri net unfoldings=DBO
[2023-11-21 21:02:29,736 INFO  L153        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
[2023-11-21 21:02:29,737 INFO  L153        SettingsManager]:  * Looper check in Petri net analysis=SEMANTIC
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_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/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_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx
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 -> Automizer
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 -> f1aed9bc44add9424c35127ba8c0166402387241540742ea765fb4b7385c8271
[2023-11-21 21:02:30,076 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2023-11-21 21:02:30,108 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2023-11-21 21:02:30,111 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2023-11-21 21:02:30,112 INFO  L270        PluginConnector]: Initializing CDTParser...
[2023-11-21 21:02:30,113 INFO  L274        PluginConnector]: CDTParser initialized
[2023-11-21 21:02:30,114 INFO  L431   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/../../sv-benchmarks/c/array-lopstr16/single_elem_safe.i
[2023-11-21 21:02:33,325 INFO  L533              CDTParser]: Created temporary CDT project at NULL
[2023-11-21 21:02:33,622 INFO  L384              CDTParser]: Found 1 translation units.
[2023-11-21 21:02:33,623 INFO  L180              CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/sv-benchmarks/c/array-lopstr16/single_elem_safe.i
[2023-11-21 21:02:33,632 INFO  L427              CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/data/a7a00b7f9/1eee403c09db426082ee96361ad39fe5/FLAGc727c46c8
[2023-11-21 21:02:33,653 INFO  L435              CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/data/a7a00b7f9/1eee403c09db426082ee96361ad39fe5
[2023-11-21 21:02:33,659 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2023-11-21 21:02:33,661 INFO  L133        ToolchainWalker]: Walking toolchain with 6 elements.
[2023-11-21 21:02:33,663 INFO  L112        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2023-11-21 21:02:33,663 INFO  L270        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2023-11-21 21:02:33,669 INFO  L274        PluginConnector]: CACSL2BoogieTranslator initialized
[2023-11-21 21:02:33,672 INFO  L184        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 09:02:33" (1/1) ...
[2023-11-21 21:02:33,673 INFO  L204        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4dfaff14 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:02:33, skipping insertion in model container
[2023-11-21 21:02:33,674 INFO  L184        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 09:02:33" (1/1) ...
[2023-11-21 21:02:33,700 INFO  L177         MainTranslator]: Built tables and reachable declarations
[2023-11-21 21:02:33,878 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_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/sv-benchmarks/c/array-lopstr16/single_elem_safe.i[809,822]
[2023-11-21 21:02:33,901 INFO  L209          PostProcessor]: Analyzing one entry point: main
[2023-11-21 21:02:33,913 INFO  L202         MainTranslator]: Completed pre-run
[2023-11-21 21:02:33,926 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_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/sv-benchmarks/c/array-lopstr16/single_elem_safe.i[809,822]
[2023-11-21 21:02:33,935 INFO  L209          PostProcessor]: Analyzing one entry point: main
[2023-11-21 21:02:33,953 INFO  L206         MainTranslator]: Completed translation
[2023-11-21 21:02:33,954 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:02:33 WrapperNode
[2023-11-21 21:02:33,954 INFO  L131        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2023-11-21 21:02:33,955 INFO  L112        PluginConnector]: ------------------------Boogie Procedure Inliner----------------------------
[2023-11-21 21:02:33,955 INFO  L270        PluginConnector]: Initializing Boogie Procedure Inliner...
[2023-11-21 21:02:33,956 INFO  L274        PluginConnector]: Boogie Procedure Inliner initialized
[2023-11-21 21:02:33,962 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:02:33" (1/1) ...
[2023-11-21 21:02:33,970 INFO  L184        PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:02:33" (1/1) ...
[2023-11-21 21:02:33,989 INFO  L138                Inliner]: procedures = 19, calls = 20, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 75
[2023-11-21 21:02:33,990 INFO  L131        PluginConnector]: ------------------------ END Boogie Procedure Inliner----------------------------
[2023-11-21 21:02:33,990 INFO  L112        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2023-11-21 21:02:33,991 INFO  L270        PluginConnector]: Initializing Boogie Preprocessor...
[2023-11-21 21:02:33,991 INFO  L274        PluginConnector]: Boogie Preprocessor initialized
[2023-11-21 21:02:34,003 INFO  L184        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:02:33" (1/1) ...
[2023-11-21 21:02:34,003 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:02:33" (1/1) ...
[2023-11-21 21:02:34,006 INFO  L184        PluginConnector]: Executing the observer HeapSplitter from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:02:33" (1/1) ...
[2023-11-21 21:02:34,018 INFO  L187           HeapSplitter]: Split 11 memory accesses to 3 slices as follows [2, 3, 6]
[2023-11-21 21:02:34,019 INFO  L184        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:02:33" (1/1) ...
[2023-11-21 21:02:34,019 INFO  L184        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:02:33" (1/1) ...
[2023-11-21 21:02:34,026 INFO  L184        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:02:33" (1/1) ...
[2023-11-21 21:02:34,030 INFO  L184        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:02:33" (1/1) ...
[2023-11-21 21:02:34,032 INFO  L184        PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:02:33" (1/1) ...
[2023-11-21 21:02:34,034 INFO  L184        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:02:33" (1/1) ...
[2023-11-21 21:02:34,047 INFO  L131        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2023-11-21 21:02:34,048 INFO  L112        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2023-11-21 21:02:34,048 INFO  L270        PluginConnector]: Initializing RCFGBuilder...
[2023-11-21 21:02:34,048 INFO  L274        PluginConnector]: RCFGBuilder initialized
[2023-11-21 21:02:34,049 INFO  L184        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:02:33" (1/1) ...
[2023-11-21 21:02:34,055 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2023-11-21 21:02:34,071 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/z3
[2023-11-21 21:02:34,087 INFO  L229       MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
[2023-11-21 21:02:34,113 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process
[2023-11-21 21:02:34,136 INFO  L130     BoogieDeclarations]: Found specification of procedure read~$Pointer$#0
[2023-11-21 21:02:34,137 INFO  L130     BoogieDeclarations]: Found specification of procedure read~$Pointer$#1
[2023-11-21 21:02:34,137 INFO  L130     BoogieDeclarations]: Found specification of procedure read~$Pointer$#2
[2023-11-21 21:02:34,137 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit
[2023-11-21 21:02:34,137 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int#0
[2023-11-21 21:02:34,138 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int#1
[2023-11-21 21:02:34,138 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int#2
[2023-11-21 21:02:34,140 INFO  L130     BoogieDeclarations]: Found specification of procedure write~$Pointer$#0
[2023-11-21 21:02:34,140 INFO  L130     BoogieDeclarations]: Found specification of procedure write~$Pointer$#1
[2023-11-21 21:02:34,141 INFO  L130     BoogieDeclarations]: Found specification of procedure write~$Pointer$#2
[2023-11-21 21:02:34,141 INFO  L130     BoogieDeclarations]: Found specification of procedure write~int#0
[2023-11-21 21:02:34,141 INFO  L130     BoogieDeclarations]: Found specification of procedure write~int#1
[2023-11-21 21:02:34,141 INFO  L130     BoogieDeclarations]: Found specification of procedure write~int#2
[2023-11-21 21:02:34,142 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap
[2023-11-21 21:02:34,142 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2023-11-21 21:02:34,142 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2023-11-21 21:02:34,142 INFO  L130     BoogieDeclarations]: Found specification of procedure read~int#0
[2023-11-21 21:02:34,142 INFO  L130     BoogieDeclarations]: Found specification of procedure read~int#1
[2023-11-21 21:02:34,143 INFO  L130     BoogieDeclarations]: Found specification of procedure read~int#2
[2023-11-21 21:02:34,296 INFO  L240             CfgBuilder]: Building ICFG
[2023-11-21 21:02:34,298 INFO  L266             CfgBuilder]: Building CFG for each procedure with an implementation
[2023-11-21 21:02:34,560 INFO  L281             CfgBuilder]: Performing block encoding
[2023-11-21 21:02:34,704 INFO  L303             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2023-11-21 21:02:34,704 INFO  L308             CfgBuilder]: Removed 2 assume(true) statements.
[2023-11-21 21:02:34,706 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 09:02:34 BoogieIcfgContainer
[2023-11-21 21:02:34,706 INFO  L131        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2023-11-21 21:02:34,709 INFO  L112        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2023-11-21 21:02:34,709 INFO  L270        PluginConnector]: Initializing TraceAbstraction...
[2023-11-21 21:02:34,714 INFO  L274        PluginConnector]: TraceAbstraction initialized
[2023-11-21 21:02:34,714 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 09:02:33" (1/3) ...
[2023-11-21 21:02:34,718 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3aa52e7c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 09:02:34, skipping insertion in model container
[2023-11-21 21:02:34,719 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 09:02:33" (2/3) ...
[2023-11-21 21:02:34,719 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3aa52e7c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 09:02:34, skipping insertion in model container
[2023-11-21 21:02:34,719 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 09:02:34" (3/3) ...
[2023-11-21 21:02:34,721 INFO  L112   eAbstractionObserver]: Analyzing ICFG single_elem_safe.i
[2023-11-21 21:02:34,740 INFO  L203   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2023-11-21 21:02:34,740 INFO  L162   ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations.
[2023-11-21 21:02:34,794 INFO  L356      AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ========
[2023-11-21 21:02:34,800 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=PETRI_NET, 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;@2db10221, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms]
[2023-11-21 21:02:34,800 INFO  L358      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2023-11-21 21:02:34,804 INFO  L276                IsEmpty]: Start isEmpty. Operand  has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 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)
[2023-11-21 21:02:34,819 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 7
[2023-11-21 21:02:34,819 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-21 21:02:34,820 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1]
[2023-11-21 21:02:34,821 INFO  L420      AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-21 21:02:34,825 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-21 21:02:34,826 INFO  L85        PathProgramCache]: Analyzing trace with hash -1181219824, now seen corresponding path program 1 times
[2023-11-21 21:02:34,833 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2023-11-21 21:02:34,833 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942855931]
[2023-11-21 21:02:34,833 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-21 21:02:34,834 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-21 21:02:34,963 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-21 21:02:35,115 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-21 21:02:35,116 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2023-11-21 21:02:35,116 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942855931]
[2023-11-21 21:02:35,117 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1942855931] provided 1 perfect and 0 imperfect interpolant sequences
[2023-11-21 21:02:35,117 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-11-21 21:02:35,117 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2
[2023-11-21 21:02:35,119 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137764796]
[2023-11-21 21:02:35,120 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-21 21:02:35,124 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 3 states
[2023-11-21 21:02:35,125 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2023-11-21 21:02:35,153 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2023-11-21 21:02:35,154 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2023-11-21 21:02:35,156 INFO  L87              Difference]: Start difference. First operand  has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand  has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 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)
[2023-11-21 21:02:35,208 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-21 21:02:35,208 INFO  L93              Difference]: Finished difference Result 26 states and 35 transitions.
[2023-11-21 21:02:35,210 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2023-11-21 21:02:35,211 INFO  L78                 Accepts]: Start accepts. Automaton has  has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 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
[2023-11-21 21:02:35,212 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-21 21:02:35,219 INFO  L225             Difference]: With dead ends: 26
[2023-11-21 21:02:35,219 INFO  L226             Difference]: Without dead ends: 17
[2023-11-21 21:02:35,222 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2023-11-21 21:02:35,226 INFO  L413           NwaCegarLoop]: 6 mSDtfsCounter, 7 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time
[2023-11-21 21:02:35,227 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 12 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time]
[2023-11-21 21:02:35,245 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 17 states.
[2023-11-21 21:02:35,256 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 10.
[2023-11-21 21:02:35,257 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-21 21:02:35,258 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions.
[2023-11-21 21:02:35,259 INFO  L78                 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 6
[2023-11-21 21:02:35,260 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-21 21:02:35,260 INFO  L495      AbstractCegarLoop]: Abstraction has 10 states and 12 transitions.
[2023-11-21 21:02:35,260 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 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)
[2023-11-21 21:02:35,261 INFO  L276                IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions.
[2023-11-21 21:02:35,261 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 8
[2023-11-21 21:02:35,261 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-21 21:02:35,261 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1]
[2023-11-21 21:02:35,262 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2023-11-21 21:02:35,262 INFO  L420      AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-21 21:02:35,263 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-21 21:02:35,263 INFO  L85        PathProgramCache]: Analyzing trace with hash -2053176566, now seen corresponding path program 1 times
[2023-11-21 21:02:35,263 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2023-11-21 21:02:35,264 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2066547058]
[2023-11-21 21:02:35,264 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-21 21:02:35,264 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-21 21:02:35,315 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-21 21:02:35,510 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-21 21:02:35,510 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2023-11-21 21:02:35,510 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2066547058]
[2023-11-21 21:02:35,511 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2066547058] provided 0 perfect and 1 imperfect interpolant sequences
[2023-11-21 21:02:35,511 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1220435100]
[2023-11-21 21:02:35,511 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-21 21:02:35,511 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-21 21:02:35,512 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/z3
[2023-11-21 21:02:35,517 INFO  L229       MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-11-21 21:02:35,529 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process
[2023-11-21 21:02:35,638 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-21 21:02:35,640 INFO  L262         TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 3 conjunts are in the unsatisfiable core
[2023-11-21 21:02:35,645 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-11-21 21:02:35,683 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-21 21:02:35,684 INFO  L327         TraceCheckSpWp]: Computing backward predicates...
[2023-11-21 21:02:35,718 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-21 21:02:35,719 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1220435100] provided 0 perfect and 2 imperfect interpolant sequences
[2023-11-21 21:02:35,719 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2023-11-21 21:02:35,720 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6
[2023-11-21 21:02:35,721 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166157635]
[2023-11-21 21:02:35,721 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2023-11-21 21:02:35,722 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 7 states
[2023-11-21 21:02:35,723 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2023-11-21 21:02:35,724 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2023-11-21 21:02:35,724 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42
[2023-11-21 21:02:35,724 INFO  L87              Difference]: Start difference. First operand 10 states and 12 transitions. Second operand  has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-21 21:02:35,956 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-21 21:02:35,956 INFO  L93              Difference]: Finished difference Result 42 states and 51 transitions.
[2023-11-21 21:02:35,957 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2023-11-21 21:02:35,957 INFO  L78                 Accepts]: Start accepts. Automaton has  has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7
[2023-11-21 21:02:35,957 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-21 21:02:35,958 INFO  L225             Difference]: With dead ends: 42
[2023-11-21 21:02:35,958 INFO  L226             Difference]: Without dead ends: 35
[2023-11-21 21:02:35,959 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42
[2023-11-21 21:02:35,961 INFO  L413           NwaCegarLoop]: 6 mSDtfsCounter, 42 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time
[2023-11-21 21:02:35,961 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 24 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time]
[2023-11-21 21:02:35,963 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 35 states.
[2023-11-21 21:02:35,966 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 13.
[2023-11-21 21:02:35,968 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-21 21:02:35,969 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions.
[2023-11-21 21:02:35,969 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 7
[2023-11-21 21:02:35,969 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-21 21:02:35,971 INFO  L495      AbstractCegarLoop]: Abstraction has 13 states and 15 transitions.
[2023-11-21 21:02:35,972 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-21 21:02:35,972 INFO  L276                IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions.
[2023-11-21 21:02:35,972 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 11
[2023-11-21 21:02:35,973 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-21 21:02:35,973 INFO  L195           NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1]
[2023-11-21 21:02:36,001 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0
[2023-11-21 21:02:36,193 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-21 21:02:36,194 INFO  L420      AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-21 21:02:36,195 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-21 21:02:36,195 INFO  L85        PathProgramCache]: Analyzing trace with hash 48034448, now seen corresponding path program 2 times
[2023-11-21 21:02:36,195 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2023-11-21 21:02:36,195 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [26665690]
[2023-11-21 21:02:36,195 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-21 21:02:36,196 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-21 21:02:36,319 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-21 21:02:36,666 INFO  L134       CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-21 21:02:36,666 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2023-11-21 21:02:36,666 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [26665690]
[2023-11-21 21:02:36,667 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [26665690] provided 0 perfect and 1 imperfect interpolant sequences
[2023-11-21 21:02:36,667 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [781571909]
[2023-11-21 21:02:36,667 INFO  L93    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
[2023-11-21 21:02:36,667 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-21 21:02:36,668 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/z3
[2023-11-21 21:02:36,669 INFO  L229       MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-11-21 21:02:36,684 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process
[2023-11-21 21:02:36,872 INFO  L228   tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s)
[2023-11-21 21:02:36,872 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2023-11-21 21:02:36,874 INFO  L262         TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 6 conjunts are in the unsatisfiable core
[2023-11-21 21:02:36,877 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-11-21 21:02:36,903 INFO  L134       CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-21 21:02:36,904 INFO  L327         TraceCheckSpWp]: Computing backward predicates...
[2023-11-21 21:02:36,970 INFO  L134       CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-21 21:02:36,971 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [781571909] provided 0 perfect and 2 imperfect interpolant sequences
[2023-11-21 21:02:36,971 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2023-11-21 21:02:36,971 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12
[2023-11-21 21:02:36,972 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026758150]
[2023-11-21 21:02:36,972 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2023-11-21 21:02:36,972 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 13 states
[2023-11-21 21:02:36,973 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2023-11-21 21:02:36,974 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2023-11-21 21:02:36,974 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156
[2023-11-21 21:02:36,975 INFO  L87              Difference]: Start difference. First operand 13 states and 15 transitions. Second operand  has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 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)
[2023-11-21 21:02:37,333 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-21 21:02:37,333 INFO  L93              Difference]: Finished difference Result 90 states and 108 transitions.
[2023-11-21 21:02:37,334 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2023-11-21 21:02:37,334 INFO  L78                 Accepts]: Start accepts. Automaton has  has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 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) Word has length 10
[2023-11-21 21:02:37,334 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-21 21:02:37,338 INFO  L225             Difference]: With dead ends: 90
[2023-11-21 21:02:37,341 INFO  L226             Difference]: Without dead ends: 83
[2023-11-21 21:02:37,343 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156
[2023-11-21 21:02:37,346 INFO  L413           NwaCegarLoop]: 6 mSDtfsCounter, 147 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 147 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time
[2023-11-21 21:02:37,351 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [147 Valid, 66 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time]
[2023-11-21 21:02:37,354 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 83 states.
[2023-11-21 21:02:37,364 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 19.
[2023-11-21 21:02:37,364 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 19 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 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)
[2023-11-21 21:02:37,365 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions.
[2023-11-21 21:02:37,365 INFO  L78                 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 10
[2023-11-21 21:02:37,366 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-21 21:02:37,366 INFO  L495      AbstractCegarLoop]: Abstraction has 19 states and 21 transitions.
[2023-11-21 21:02:37,366 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 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)
[2023-11-21 21:02:37,366 INFO  L276                IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions.
[2023-11-21 21:02:37,367 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 17
[2023-11-21 21:02:37,367 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-21 21:02:37,367 INFO  L195           NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1]
[2023-11-21 21:02:37,397 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0
[2023-11-21 21:02:37,567 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-21 21:02:37,568 INFO  L420      AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-21 21:02:37,568 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-21 21:02:37,569 INFO  L85        PathProgramCache]: Analyzing trace with hash 179519568, now seen corresponding path program 3 times
[2023-11-21 21:02:37,569 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2023-11-21 21:02:37,569 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1244323151]
[2023-11-21 21:02:37,569 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-21 21:02:37,569 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-21 21:02:37,717 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-21 21:02:38,331 INFO  L134       CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-21 21:02:38,332 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2023-11-21 21:02:38,332 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1244323151]
[2023-11-21 21:02:38,332 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1244323151] provided 0 perfect and 1 imperfect interpolant sequences
[2023-11-21 21:02:38,332 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1423907922]
[2023-11-21 21:02:38,332 INFO  L93    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2
[2023-11-21 21:02:38,333 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-21 21:02:38,333 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/z3
[2023-11-21 21:02:38,334 INFO  L229       MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-11-21 21:02:38,363 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_8ed366be-5289-4b77-9cd6-7ce8f4d0c9b7/bin/uautomizer-verify-bycVGegfSx/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process