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


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


Checking for ERROR reachability
Using default analysis
Version 9bd2c7ff
Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_partial_init_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ --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 59d5175089b9a27cfba8f910bda680bc8b61a004048e68040b8cf993cc9cd888
--- Real Ultimate output ---
This is Ultimate 0.2.3-dev-9bd2c7f
[2023-11-19 04:57:43,731 INFO  L188        SettingsManager]: Resetting all preferences to default values...
[2023-11-19 04:57:43,809 INFO  L114        SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf
[2023-11-19 04:57:43,814 WARN  L101        SettingsManager]: Preference file contains the following unknown settings:
[2023-11-19 04:57:43,815 WARN  L103        SettingsManager]:   * de.uni_freiburg.informatik.ultimate.core.Log level for class
[2023-11-19 04:57:43,844 INFO  L130        SettingsManager]: Preferences different from defaults after loading the file:
[2023-11-19 04:57:43,845 INFO  L151        SettingsManager]: Preferences of UltimateCore differ from their defaults:
[2023-11-19 04:57:43,846 INFO  L153        SettingsManager]:  * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR;
[2023-11-19 04:57:43,847 INFO  L151        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2023-11-19 04:57:43,847 INFO  L153        SettingsManager]:  * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS
[2023-11-19 04:57:43,848 INFO  L153        SettingsManager]:  * User list type=DISABLED
[2023-11-19 04:57:43,849 INFO  L151        SettingsManager]: Preferences of Abstract Interpretation differ from their defaults:
[2023-11-19 04:57:43,849 INFO  L153        SettingsManager]:  * Explicit value domain=true
[2023-11-19 04:57:43,850 INFO  L153        SettingsManager]:  * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain
[2023-11-19 04:57:43,851 INFO  L153        SettingsManager]:  * Octagon Domain=false
[2023-11-19 04:57:43,851 INFO  L153        SettingsManager]:  * Abstract domain=CompoundDomain
[2023-11-19 04:57:43,852 INFO  L153        SettingsManager]:  * Check feasibility of abstract posts with an SMT solver=true
[2023-11-19 04:57:43,852 INFO  L153        SettingsManager]:  * Use the RCFG-of-the-future interface=true
[2023-11-19 04:57:43,853 INFO  L153        SettingsManager]:  * Interval Domain=false
[2023-11-19 04:57:43,854 INFO  L151        SettingsManager]: Preferences of Sifa differ from their defaults:
[2023-11-19 04:57:43,854 INFO  L153        SettingsManager]:  * Call Summarizer=TopInputCallSummarizer
[2023-11-19 04:57:43,855 INFO  L153        SettingsManager]:  * Simplification Technique=POLY_PAC
[2023-11-19 04:57:43,856 INFO  L151        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2023-11-19 04:57:43,857 INFO  L153        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2023-11-19 04:57:43,857 INFO  L153        SettingsManager]:  * sizeof long=4
[2023-11-19 04:57:43,858 INFO  L153        SettingsManager]:  * Overapproximate operations on floating types=true
[2023-11-19 04:57:43,859 INFO  L153        SettingsManager]:  * sizeof POINTER=4
[2023-11-19 04:57:43,859 INFO  L153        SettingsManager]:  * Check division by zero=IGNORE
[2023-11-19 04:57:43,860 INFO  L153        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2023-11-19 04:57:43,860 INFO  L153        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2023-11-19 04:57:43,861 INFO  L153        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2023-11-19 04:57:43,862 INFO  L153        SettingsManager]:  * sizeof long double=12
[2023-11-19 04:57:43,862 INFO  L153        SettingsManager]:  * Check if freed pointer was valid=false
[2023-11-19 04:57:43,863 INFO  L153        SettingsManager]:  * Use constant arrays=true
[2023-11-19 04:57:43,863 INFO  L151        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2023-11-19 04:57:43,864 INFO  L153        SettingsManager]:  * SMT solver=External_DefaultMode
[2023-11-19 04:57:43,865 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2023-11-19 04:57:43,865 INFO  L151        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2023-11-19 04:57:43,866 INFO  L153        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2023-11-19 04:57:43,867 INFO  L153        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopHeads
[2023-11-19 04:57:43,867 INFO  L153        SettingsManager]:  * Trace refinement strategy=SIFA_TAIPAN
[2023-11-19 04:57:43,868 INFO  L153        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2023-11-19 04:57:43,869 INFO  L153        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2023-11-19 04:57:43,869 INFO  L153        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2023-11-19 04:57:43,870 INFO  L153        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
[2023-11-19 04:57:43,870 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_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/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_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ
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 -> 59d5175089b9a27cfba8f910bda680bc8b61a004048e68040b8cf993cc9cd888
[2023-11-19 04:57:44,113 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2023-11-19 04:57:44,158 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2023-11-19 04:57:44,160 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2023-11-19 04:57:44,163 INFO  L270        PluginConnector]: Initializing CDTParser...
[2023-11-19 04:57:44,163 INFO  L274        PluginConnector]: CDTParser initialized
[2023-11-19 04:57:44,166 INFO  L431   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/array-examples/standard_partial_init_ground.i
[2023-11-19 04:57:47,422 INFO  L533              CDTParser]: Created temporary CDT project at NULL
[2023-11-19 04:57:47,668 INFO  L384              CDTParser]: Found 1 translation units.
[2023-11-19 04:57:47,669 INFO  L180              CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/sv-benchmarks/c/array-examples/standard_partial_init_ground.i
[2023-11-19 04:57:47,678 INFO  L427              CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/data/6801619a8/b520058f691e4b619d895cb3bd2b65bf/FLAGc84aa01c1
[2023-11-19 04:57:47,695 INFO  L435              CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/data/6801619a8/b520058f691e4b619d895cb3bd2b65bf
[2023-11-19 04:57:47,698 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2023-11-19 04:57:47,700 INFO  L133        ToolchainWalker]: Walking toolchain with 6 elements.
[2023-11-19 04:57:47,702 INFO  L112        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2023-11-19 04:57:47,702 INFO  L270        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2023-11-19 04:57:47,708 INFO  L274        PluginConnector]: CACSL2BoogieTranslator initialized
[2023-11-19 04:57:47,709 INFO  L184        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:57:47" (1/1) ...
[2023-11-19 04:57:47,710 INFO  L204        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@48bb9e2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:47, skipping insertion in model container
[2023-11-19 04:57:47,711 INFO  L184        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:57:47" (1/1) ...
[2023-11-19 04:57:47,736 INFO  L177         MainTranslator]: Built tables and reachable declarations
[2023-11-19 04:57:47,949 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_5c0a22ed-e0a4-4f94-b995-4362486c1727/sv-benchmarks/c/array-examples/standard_partial_init_ground.i[821,834]
[2023-11-19 04:57:47,980 INFO  L209          PostProcessor]: Analyzing one entry point: main
[2023-11-19 04:57:47,992 INFO  L202         MainTranslator]: Completed pre-run
[2023-11-19 04:57:48,010 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_5c0a22ed-e0a4-4f94-b995-4362486c1727/sv-benchmarks/c/array-examples/standard_partial_init_ground.i[821,834]
[2023-11-19 04:57:48,031 INFO  L209          PostProcessor]: Analyzing one entry point: main
[2023-11-19 04:57:48,052 INFO  L206         MainTranslator]: Completed translation
[2023-11-19 04:57:48,053 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:48 WrapperNode
[2023-11-19 04:57:48,053 INFO  L131        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2023-11-19 04:57:48,055 INFO  L112        PluginConnector]: ------------------------Boogie Procedure Inliner----------------------------
[2023-11-19 04:57:48,055 INFO  L270        PluginConnector]: Initializing Boogie Procedure Inliner...
[2023-11-19 04:57:48,056 INFO  L274        PluginConnector]: Boogie Procedure Inliner initialized
[2023-11-19 04:57:48,063 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:48" (1/1) ...
[2023-11-19 04:57:48,086 INFO  L184        PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:48" (1/1) ...
[2023-11-19 04:57:48,123 INFO  L138                Inliner]: procedures = 16, calls = 24, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 83
[2023-11-19 04:57:48,124 INFO  L131        PluginConnector]: ------------------------ END Boogie Procedure Inliner----------------------------
[2023-11-19 04:57:48,124 INFO  L112        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2023-11-19 04:57:48,124 INFO  L270        PluginConnector]: Initializing Boogie Preprocessor...
[2023-11-19 04:57:48,125 INFO  L274        PluginConnector]: Boogie Preprocessor initialized
[2023-11-19 04:57:48,135 INFO  L184        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:48" (1/1) ...
[2023-11-19 04:57:48,135 INFO  L184        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:48" (1/1) ...
[2023-11-19 04:57:48,139 INFO  L184        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:48" (1/1) ...
[2023-11-19 04:57:48,139 INFO  L184        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:48" (1/1) ...
[2023-11-19 04:57:48,146 INFO  L184        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:48" (1/1) ...
[2023-11-19 04:57:48,159 INFO  L184        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:48" (1/1) ...
[2023-11-19 04:57:48,160 INFO  L184        PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:48" (1/1) ...
[2023-11-19 04:57:48,162 INFO  L184        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:48" (1/1) ...
[2023-11-19 04:57:48,164 INFO  L131        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2023-11-19 04:57:48,166 INFO  L112        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2023-11-19 04:57:48,166 INFO  L270        PluginConnector]: Initializing RCFGBuilder...
[2023-11-19 04:57:48,166 INFO  L274        PluginConnector]: RCFGBuilder initialized
[2023-11-19 04:57:48,167 INFO  L184        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:48" (1/1) ...
[2023-11-19 04:57:48,176 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2023-11-19 04:57:48,190 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3
[2023-11-19 04:57:48,203 INFO  L229       MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
[2023-11-19 04:57:48,218 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process
[2023-11-19 04:57:48,249 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit
[2023-11-19 04:57:48,249 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int
[2023-11-19 04:57:48,250 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack
[2023-11-19 04:57:48,250 INFO  L130     BoogieDeclarations]: Found specification of procedure write~int
[2023-11-19 04:57:48,250 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2023-11-19 04:57:48,250 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2023-11-19 04:57:48,251 INFO  L130     BoogieDeclarations]: Found specification of procedure read~int
[2023-11-19 04:57:48,251 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2023-11-19 04:57:48,251 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2023-11-19 04:57:48,251 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc
[2023-11-19 04:57:48,334 INFO  L236             CfgBuilder]: Building ICFG
[2023-11-19 04:57:48,338 INFO  L262             CfgBuilder]: Building CFG for each procedure with an implementation
[2023-11-19 04:57:48,533 INFO  L277             CfgBuilder]: Performing block encoding
[2023-11-19 04:57:48,633 INFO  L297             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2023-11-19 04:57:48,636 INFO  L302             CfgBuilder]: Removed 4 assume(true) statements.
[2023-11-19 04:57:48,640 INFO  L201        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:57:48 BoogieIcfgContainer
[2023-11-19 04:57:48,641 INFO  L131        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2023-11-19 04:57:48,644 INFO  L112        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2023-11-19 04:57:48,644 INFO  L270        PluginConnector]: Initializing TraceAbstraction...
[2023-11-19 04:57:48,648 INFO  L274        PluginConnector]: TraceAbstraction initialized
[2023-11-19 04:57:48,648 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 04:57:47" (1/3) ...
[2023-11-19 04:57:48,649 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29594101 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:57:48, skipping insertion in model container
[2023-11-19 04:57:48,649 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:57:48" (2/3) ...
[2023-11-19 04:57:48,650 INFO  L204        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29594101 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:57:48, skipping insertion in model container
[2023-11-19 04:57:48,650 INFO  L184        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:57:48" (3/3) ...
[2023-11-19 04:57:48,651 INFO  L112   eAbstractionObserver]: Analyzing ICFG standard_partial_init_ground.i
[2023-11-19 04:57:48,670 INFO  L203   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2023-11-19 04:57:48,670 INFO  L162   ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations.
[2023-11-19 04:57:48,717 INFO  L356      AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ========
[2023-11-19 04:57:48,723 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;@5d36f249, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms]
[2023-11-19 04:57:48,723 INFO  L358      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2023-11-19 04:57:48,727 INFO  L276                IsEmpty]: Start isEmpty. Operand  has 16 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 12 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2)
[2023-11-19 04:57:48,734 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 9
[2023-11-19 04:57:48,735 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-19 04:57:48,735 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-19 04:57:48,736 INFO  L420      AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-19 04:57:48,741 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-19 04:57:48,741 INFO  L85        PathProgramCache]: Analyzing trace with hash -1629969816, now seen corresponding path program 1 times
[2023-11-19 04:57:48,750 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-19 04:57:48,750 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2018110574]
[2023-11-19 04:57:48,750 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-19 04:57:48,751 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-19 04:57:48,911 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-19 04:57:49,112 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2023-11-19 04:57:49,113 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-19 04:57:49,114 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2018110574]
[2023-11-19 04:57:49,115 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2018110574] provided 1 perfect and 0 imperfect interpolant sequences
[2023-11-19 04:57:49,115 INFO  L185   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2023-11-19 04:57:49,115 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2
[2023-11-19 04:57:49,117 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083215898]
[2023-11-19 04:57:49,118 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2023-11-19 04:57:49,123 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 3 states
[2023-11-19 04:57:49,125 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-19 04:57:49,176 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2023-11-19 04:57:49,176 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2023-11-19 04:57:49,179 INFO  L87              Difference]: Start difference. First operand  has 16 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 12 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand  has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-19 04:57:49,242 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-19 04:57:49,242 INFO  L93              Difference]: Finished difference Result 32 states and 45 transitions.
[2023-11-19 04:57:49,248 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2023-11-19 04:57:49,250 INFO  L78                 Accepts]: Start accepts. Automaton has  has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8
[2023-11-19 04:57:49,250 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-19 04:57:49,259 INFO  L225             Difference]: With dead ends: 32
[2023-11-19 04:57:49,259 INFO  L226             Difference]: Without dead ends: 17
[2023-11-19 04:57:49,263 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
[2023-11-19 04:57:49,268 INFO  L413           NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time
[2023-11-19 04:57:49,269 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 22 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time]
[2023-11-19 04:57:49,290 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 17 states.
[2023-11-19 04:57:49,308 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17.
[2023-11-19 04:57:49,310 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 17 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2)
[2023-11-19 04:57:49,311 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions.
[2023-11-19 04:57:49,313 INFO  L78                 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 8
[2023-11-19 04:57:49,313 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-19 04:57:49,314 INFO  L495      AbstractCegarLoop]: Abstraction has 17 states and 21 transitions.
[2023-11-19 04:57:49,315 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-19 04:57:49,315 INFO  L276                IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions.
[2023-11-19 04:57:49,316 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 11
[2023-11-19 04:57:49,316 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-19 04:57:49,316 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-19 04:57:49,317 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2023-11-19 04:57:49,317 INFO  L420      AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-19 04:57:49,319 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-19 04:57:49,320 INFO  L85        PathProgramCache]: Analyzing trace with hash 761335963, now seen corresponding path program 1 times
[2023-11-19 04:57:49,320 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-19 04:57:49,320 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1690098310]
[2023-11-19 04:57:49,320 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-19 04:57:49,321 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-19 04:57:49,380 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-19 04:57:49,605 INFO  L134       CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2023-11-19 04:57:49,606 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-19 04:57:49,607 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1690098310]
[2023-11-19 04:57:49,607 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1690098310] provided 0 perfect and 1 imperfect interpolant sequences
[2023-11-19 04:57:49,610 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [763255186]
[2023-11-19 04:57:49,611 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-19 04:57:49,611 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-19 04:57:49,611 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3
[2023-11-19 04:57:49,614 INFO  L229       MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-11-19 04:57:49,628 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process
[2023-11-19 04:57:49,733 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-19 04:57:49,736 INFO  L262         TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 3 conjunts are in the unsatisfiable core
[2023-11-19 04:57:49,743 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-11-19 04:57:49,812 INFO  L134       CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2023-11-19 04:57:49,812 INFO  L327         TraceCheckSpWp]: Computing backward predicates...
[2023-11-19 04:57:49,854 INFO  L134       CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2023-11-19 04:57:49,856 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [763255186] provided 0 perfect and 2 imperfect interpolant sequences
[2023-11-19 04:57:49,856 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [952331537]
[2023-11-19 04:57:49,890 INFO  L159        IcfgInterpreter]: Started Sifa with 9 locations of interest
[2023-11-19 04:57:49,890 INFO  L166        IcfgInterpreter]: Building call graph
[2023-11-19 04:57:49,896 INFO  L171        IcfgInterpreter]: Initial procedures are [ULTIMATE.start]
[2023-11-19 04:57:49,902 INFO  L176        IcfgInterpreter]: Starting interpretation
[2023-11-19 04:57:49,904 INFO  L197        IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs
[2023-11-19 04:57:50,651 INFO  L197        IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs
[2023-11-19 04:57:50,670 INFO  L180        IcfgInterpreter]: Interpretation finished
[2023-11-19 04:57:53,917 INFO  L133             SifaRunner]: Sifa could not show that error location is unreachable, found '156#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location
[2023-11-19 04:57:53,917 WARN  L311   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED
[2023-11-19 04:57:53,918 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2023-11-19 04:57:53,918 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6
[2023-11-19 04:57:53,919 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763976130]
[2023-11-19 04:57:53,919 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2023-11-19 04:57:53,920 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 7 states
[2023-11-19 04:57:53,920 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-19 04:57:53,921 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2023-11-19 04:57:53,924 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=119, Unknown=2, NotChecked=0, Total=156
[2023-11-19 04:57:53,924 INFO  L87              Difference]: Start difference. First operand 17 states and 21 transitions. Second operand  has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-19 04:57:54,000 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-19 04:57:54,000 INFO  L93              Difference]: Finished difference Result 37 states and 50 transitions.
[2023-11-19 04:57:54,001 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2023-11-19 04:57:54,002 INFO  L78                 Accepts]: Start accepts. Automaton has  has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10
[2023-11-19 04:57:54,002 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-19 04:57:54,003 INFO  L225             Difference]: With dead ends: 37
[2023-11-19 04:57:54,003 INFO  L226             Difference]: Without dead ends: 23
[2023-11-19 04:57:54,004 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=35, Invalid=119, Unknown=2, NotChecked=0, Total=156
[2023-11-19 04:57:54,007 INFO  L413           NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2023-11-19 04:57:54,008 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 44 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2023-11-19 04:57:54,011 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 23 states.
[2023-11-19 04:57:54,018 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23.
[2023-11-19 04:57:54,019 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 23 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2)
[2023-11-19 04:57:54,022 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions.
[2023-11-19 04:57:54,022 INFO  L78                 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 10
[2023-11-19 04:57:54,022 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-19 04:57:54,022 INFO  L495      AbstractCegarLoop]: Abstraction has 23 states and 27 transitions.
[2023-11-19 04:57:54,023 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-19 04:57:54,023 INFO  L276                IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions.
[2023-11-19 04:57:54,023 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 17
[2023-11-19 04:57:54,024 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-19 04:57:54,024 INFO  L195           NwaCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-19 04:57:54,050 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0
[2023-11-19 04:57:54,241 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1
[2023-11-19 04:57:54,242 INFO  L420      AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-19 04:57:54,242 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-19 04:57:54,242 INFO  L85        PathProgramCache]: Analyzing trace with hash 1625783208, now seen corresponding path program 2 times
[2023-11-19 04:57:54,243 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-19 04:57:54,243 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1775436830]
[2023-11-19 04:57:54,243 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-19 04:57:54,243 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-19 04:57:54,296 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-19 04:57:54,425 INFO  L134       CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked.
[2023-11-19 04:57:54,425 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-19 04:57:54,426 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1775436830]
[2023-11-19 04:57:54,426 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1775436830] provided 0 perfect and 1 imperfect interpolant sequences
[2023-11-19 04:57:54,426 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1144770697]
[2023-11-19 04:57:54,426 INFO  L93    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2
[2023-11-19 04:57:54,427 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-19 04:57:54,427 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3
[2023-11-19 04:57:54,428 INFO  L229       MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-11-19 04:57:54,445 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process
[2023-11-19 04:57:54,527 INFO  L228   tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s)
[2023-11-19 04:57:54,527 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2023-11-19 04:57:54,529 INFO  L262         TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 6 conjunts are in the unsatisfiable core
[2023-11-19 04:57:54,531 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-11-19 04:57:54,548 INFO  L134       CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked.
[2023-11-19 04:57:54,548 INFO  L327         TraceCheckSpWp]: Computing backward predicates...
[2023-11-19 04:57:54,610 INFO  L134       CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked.
[2023-11-19 04:57:54,610 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1144770697] provided 0 perfect and 2 imperfect interpolant sequences
[2023-11-19 04:57:54,611 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1791230990]
[2023-11-19 04:57:54,613 INFO  L159        IcfgInterpreter]: Started Sifa with 9 locations of interest
[2023-11-19 04:57:54,614 INFO  L166        IcfgInterpreter]: Building call graph
[2023-11-19 04:57:54,614 INFO  L171        IcfgInterpreter]: Initial procedures are [ULTIMATE.start]
[2023-11-19 04:57:54,614 INFO  L176        IcfgInterpreter]: Starting interpretation
[2023-11-19 04:57:54,615 INFO  L197        IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs
[2023-11-19 04:57:54,978 INFO  L197        IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs
[2023-11-19 04:57:54,995 INFO  L180        IcfgInterpreter]: Interpretation finished
[2023-11-19 04:57:58,068 INFO  L133             SifaRunner]: Sifa could not show that error location is unreachable, found '362#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location
[2023-11-19 04:57:58,068 WARN  L311   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED
[2023-11-19 04:57:58,068 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2023-11-19 04:57:58,069 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12
[2023-11-19 04:57:58,069 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869163799]
[2023-11-19 04:57:58,069 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2023-11-19 04:57:58,070 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 13 states
[2023-11-19 04:57:58,070 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-19 04:57:58,071 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2023-11-19 04:57:58,071 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=248, Unknown=2, NotChecked=0, Total=342
[2023-11-19 04:57:58,072 INFO  L87              Difference]: Start difference. First operand 23 states and 27 transitions. Second operand  has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-19 04:57:58,165 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-19 04:57:58,165 INFO  L93              Difference]: Finished difference Result 52 states and 71 transitions.
[2023-11-19 04:57:58,166 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2023-11-19 04:57:58,166 INFO  L78                 Accepts]: Start accepts. Automaton has  has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16
[2023-11-19 04:57:58,167 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-19 04:57:58,167 INFO  L225             Difference]: With dead ends: 52
[2023-11-19 04:57:58,168 INFO  L226             Difference]: Without dead ends: 35
[2023-11-19 04:57:58,168 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=92, Invalid=248, Unknown=2, NotChecked=0, Total=342
[2023-11-19 04:57:58,170 INFO  L413           NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 25 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2023-11-19 04:57:58,170 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 55 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2023-11-19 04:57:58,171 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 35 states.
[2023-11-19 04:57:58,177 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35.
[2023-11-19 04:57:58,177 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 35 states, 31 states have (on average 1.1290322580645162) internal successors, (35), 31 states have internal predecessors, (35), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2)
[2023-11-19 04:57:58,178 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions.
[2023-11-19 04:57:58,179 INFO  L78                 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 16
[2023-11-19 04:57:58,179 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-19 04:57:58,179 INFO  L495      AbstractCegarLoop]: Abstraction has 35 states and 39 transitions.
[2023-11-19 04:57:58,180 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-19 04:57:58,180 INFO  L276                IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions.
[2023-11-19 04:57:58,181 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 29
[2023-11-19 04:57:58,181 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-19 04:57:58,181 INFO  L195           NwaCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-19 04:57:58,211 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0
[2023-11-19 04:57:58,405 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2
[2023-11-19 04:57:58,406 INFO  L420      AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-19 04:57:58,406 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-19 04:57:58,407 INFO  L85        PathProgramCache]: Analyzing trace with hash -487711352, now seen corresponding path program 3 times
[2023-11-19 04:57:58,407 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-19 04:57:58,407 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [820339038]
[2023-11-19 04:57:58,407 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-19 04:57:58,408 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-19 04:57:58,511 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-19 04:57:58,914 INFO  L134       CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked.
[2023-11-19 04:57:58,914 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-19 04:57:58,915 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [820339038]
[2023-11-19 04:57:58,915 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [820339038] provided 0 perfect and 1 imperfect interpolant sequences
[2023-11-19 04:57:58,915 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1894194284]
[2023-11-19 04:57:58,915 INFO  L93    rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST
[2023-11-19 04:57:58,916 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-19 04:57:58,916 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3
[2023-11-19 04:57:58,917 INFO  L229       MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-11-19 04:57:58,944 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process
[2023-11-19 04:57:59,069 INFO  L228   tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s)
[2023-11-19 04:57:59,070 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2023-11-19 04:57:59,072 INFO  L262         TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 12 conjunts are in the unsatisfiable core
[2023-11-19 04:57:59,075 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-11-19 04:57:59,107 INFO  L134       CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked.
[2023-11-19 04:57:59,108 INFO  L327         TraceCheckSpWp]: Computing backward predicates...
[2023-11-19 04:57:59,390 INFO  L134       CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked.
[2023-11-19 04:57:59,390 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1894194284] provided 0 perfect and 2 imperfect interpolant sequences
[2023-11-19 04:57:59,390 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1937043168]
[2023-11-19 04:57:59,393 INFO  L159        IcfgInterpreter]: Started Sifa with 9 locations of interest
[2023-11-19 04:57:59,393 INFO  L166        IcfgInterpreter]: Building call graph
[2023-11-19 04:57:59,393 INFO  L171        IcfgInterpreter]: Initial procedures are [ULTIMATE.start]
[2023-11-19 04:57:59,394 INFO  L176        IcfgInterpreter]: Starting interpretation
[2023-11-19 04:57:59,394 INFO  L197        IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs
[2023-11-19 04:57:59,685 INFO  L197        IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 24 for LOIs
[2023-11-19 04:57:59,714 INFO  L180        IcfgInterpreter]: Interpretation finished
[2023-11-19 04:58:02,931 INFO  L133             SifaRunner]: Sifa could not show that error location is unreachable, found '706#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location
[2023-11-19 04:58:02,931 WARN  L311   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED
[2023-11-19 04:58:02,931 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2023-11-19 04:58:02,932 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24
[2023-11-19 04:58:02,932 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051016863]
[2023-11-19 04:58:02,932 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2023-11-19 04:58:02,933 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 25 states
[2023-11-19 04:58:02,933 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-19 04:58:02,934 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants.
[2023-11-19 04:58:02,935 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=614, Unknown=2, NotChecked=0, Total=930
[2023-11-19 04:58:02,936 INFO  L87              Difference]: Start difference. First operand 35 states and 39 transitions. Second operand  has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-19 04:58:03,145 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-19 04:58:03,145 INFO  L93              Difference]: Finished difference Result 82 states and 113 transitions.
[2023-11-19 04:58:03,146 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. 
[2023-11-19 04:58:03,146 INFO  L78                 Accepts]: Start accepts. Automaton has  has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28
[2023-11-19 04:58:03,147 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-19 04:58:03,150 INFO  L225             Difference]: With dead ends: 82
[2023-11-19 04:58:03,150 INFO  L226             Difference]: Without dead ends: 59
[2023-11-19 04:58:03,152 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=314, Invalid=614, Unknown=2, NotChecked=0, Total=930
[2023-11-19 04:58:03,157 INFO  L413           NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 74 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 44 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 74 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2023-11-19 04:58:03,159 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 44 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [74 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2023-11-19 04:58:03,161 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 59 states.
[2023-11-19 04:58:03,177 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59.
[2023-11-19 04:58:03,178 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 59 states, 55 states have (on average 1.0727272727272728) internal successors, (59), 55 states have internal predecessors, (59), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2)
[2023-11-19 04:58:03,179 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 63 transitions.
[2023-11-19 04:58:03,179 INFO  L78                 Accepts]: Start accepts. Automaton has 59 states and 63 transitions. Word has length 28
[2023-11-19 04:58:03,179 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-19 04:58:03,180 INFO  L495      AbstractCegarLoop]: Abstraction has 59 states and 63 transitions.
[2023-11-19 04:58:03,180 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-19 04:58:03,180 INFO  L276                IsEmpty]: Start isEmpty. Operand 59 states and 63 transitions.
[2023-11-19 04:58:03,182 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 53
[2023-11-19 04:58:03,182 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-19 04:58:03,182 INFO  L195           NwaCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-19 04:58:03,215 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0
[2023-11-19 04:58:03,409 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3
[2023-11-19 04:58:03,410 INFO  L420      AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-19 04:58:03,410 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-19 04:58:03,410 INFO  L85        PathProgramCache]: Analyzing trace with hash 1925937480, now seen corresponding path program 4 times
[2023-11-19 04:58:03,410 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-19 04:58:03,411 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2048555165]
[2023-11-19 04:58:03,411 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-19 04:58:03,411 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-19 04:58:03,560 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-19 04:58:04,858 INFO  L134       CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked.
[2023-11-19 04:58:04,859 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-19 04:58:04,859 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2048555165]
[2023-11-19 04:58:04,859 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2048555165] provided 0 perfect and 1 imperfect interpolant sequences
[2023-11-19 04:58:04,860 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1821755627]
[2023-11-19 04:58:04,860 INFO  L93    rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY
[2023-11-19 04:58:04,860 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-19 04:58:04,860 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3
[2023-11-19 04:58:04,861 INFO  L229       MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-11-19 04:58:04,875 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process
[2023-11-19 04:58:05,101 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-19 04:58:05,106 INFO  L262         TraceCheckSpWp]: Trace formula consists of 533 conjuncts, 24 conjunts are in the unsatisfiable core
[2023-11-19 04:58:05,115 INFO  L285         TraceCheckSpWp]: Computing forward predicates...
[2023-11-19 04:58:05,180 INFO  L134       CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked.
[2023-11-19 04:58:05,180 INFO  L327         TraceCheckSpWp]: Computing backward predicates...
[2023-11-19 04:58:06,234 INFO  L134       CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked.
[2023-11-19 04:58:06,235 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1821755627] provided 0 perfect and 2 imperfect interpolant sequences
[2023-11-19 04:58:06,235 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1099178172]
[2023-11-19 04:58:06,237 INFO  L159        IcfgInterpreter]: Started Sifa with 9 locations of interest
[2023-11-19 04:58:06,237 INFO  L166        IcfgInterpreter]: Building call graph
[2023-11-19 04:58:06,238 INFO  L171        IcfgInterpreter]: Initial procedures are [ULTIMATE.start]
[2023-11-19 04:58:06,238 INFO  L176        IcfgInterpreter]: Starting interpretation
[2023-11-19 04:58:06,238 INFO  L197        IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs
[2023-11-19 04:58:06,554 INFO  L197        IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 28 for LOIs
[2023-11-19 04:58:06,567 INFO  L180        IcfgInterpreter]: Interpretation finished
[2023-11-19 04:58:09,782 INFO  L133             SifaRunner]: Sifa could not show that error location is unreachable, found '1326#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location
[2023-11-19 04:58:09,782 WARN  L311   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED
[2023-11-19 04:58:09,782 INFO  L185   FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences.
[2023-11-19 04:58:09,782 INFO  L198   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48
[2023-11-19 04:58:09,783 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1851203801]
[2023-11-19 04:58:09,783 INFO  L85    oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton
[2023-11-19 04:58:09,784 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 49 states
[2023-11-19 04:58:09,784 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN
[2023-11-19 04:58:09,786 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants.
[2023-11-19 04:58:09,787 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=1195, Invalid=1883, Unknown=2, NotChecked=0, Total=3080
[2023-11-19 04:58:09,788 INFO  L87              Difference]: Start difference. First operand 59 states and 63 transitions. Second operand  has 49 states, 49 states have (on average 1.1428571428571428) internal successors, (56), 48 states have internal predecessors, (56), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-19 04:58:10,218 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2023-11-19 04:58:10,218 INFO  L93              Difference]: Finished difference Result 142 states and 197 transitions.
[2023-11-19 04:58:10,219 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. 
[2023-11-19 04:58:10,219 INFO  L78                 Accepts]: Start accepts. Automaton has  has 49 states, 49 states have (on average 1.1428571428571428) internal successors, (56), 48 states have internal predecessors, (56), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 52
[2023-11-19 04:58:10,219 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2023-11-19 04:58:10,221 INFO  L225             Difference]: With dead ends: 142
[2023-11-19 04:58:10,221 INFO  L226             Difference]: Without dead ends: 107
[2023-11-19 04:58:10,223 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 579 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=1195, Invalid=1883, Unknown=2, NotChecked=0, Total=3080
[2023-11-19 04:58:10,224 INFO  L413           NwaCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 182 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 298 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 182 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time
[2023-11-19 04:58:10,225 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 55 Invalid, 298 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [182 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time]
[2023-11-19 04:58:10,226 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 107 states.
[2023-11-19 04:58:10,237 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107.
[2023-11-19 04:58:10,238 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 107 states, 103 states have (on average 1.0388349514563107) internal successors, (107), 103 states have internal predecessors, (107), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2)
[2023-11-19 04:58:10,240 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 111 transitions.
[2023-11-19 04:58:10,240 INFO  L78                 Accepts]: Start accepts. Automaton has 107 states and 111 transitions. Word has length 52
[2023-11-19 04:58:10,240 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2023-11-19 04:58:10,240 INFO  L495      AbstractCegarLoop]: Abstraction has 107 states and 111 transitions.
[2023-11-19 04:58:10,241 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 49 states, 49 states have (on average 1.1428571428571428) internal successors, (56), 48 states have internal predecessors, (56), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)
[2023-11-19 04:58:10,241 INFO  L276                IsEmpty]: Start isEmpty. Operand 107 states and 111 transitions.
[2023-11-19 04:58:10,245 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 101
[2023-11-19 04:58:10,245 INFO  L187           NwaCegarLoop]: Found error trace
[2023-11-19 04:58:10,245 INFO  L195           NwaCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1]
[2023-11-19 04:58:10,278 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0
[2023-11-19 04:58:10,461 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-19 04:58:10,461 INFO  L420      AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2023-11-19 04:58:10,462 INFO  L160       PredicateUnifier]: Initialized classic predicate unifier
[2023-11-19 04:58:10,462 INFO  L85        PathProgramCache]: Analyzing trace with hash 633245896, now seen corresponding path program 5 times
[2023-11-19 04:58:10,462 INFO  L118   FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN
[2023-11-19 04:58:10,462 INFO  L334   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1412153645]
[2023-11-19 04:58:10,462 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2023-11-19 04:58:10,462 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2023-11-19 04:58:10,761 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2023-11-19 04:58:14,651 INFO  L134       CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked.
[2023-11-19 04:58:14,651 INFO  L136   FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace
[2023-11-19 04:58:14,652 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1412153645]
[2023-11-19 04:58:14,652 INFO  L158   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1412153645] provided 0 perfect and 1 imperfect interpolant sequences
[2023-11-19 04:58:14,652 INFO  L334   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [531936306]
[2023-11-19 04:58:14,652 INFO  L93    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2
[2023-11-19 04:58:14,652 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2023-11-19 04:58:14,653 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3
[2023-11-19 04:58:14,654 INFO  L229       MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2023-11-19 04:58:14,674 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5c0a22ed-e0a4-4f94-b995-4362486c1727/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process