./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound100.c --full-output --architecture 32bit


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


Checking for ERROR reachability
Using default analysis
Version dbf71c69
Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/config/AutomizerReach.xml -i ../../sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound100.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) )

 --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash c55d57654781cf0634666e1c7d4e43dff0d9410f4306aded3e4e446e1f9e88d1
--- Real Ultimate output ---
[0.001s][warning][os,container] Duplicate cpuset controllers detected. Picking /sys/fs/cgroup/cpuset, skipping /sys/fs/cgroup/cpuset.
This is Ultimate 0.2.2-dev-dbf71c6-m
[2022-10-17 10:48:05,962 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2022-10-17 10:48:05,963 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2022-10-17 10:48:06,003 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2022-10-17 10:48:06,004 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2022-10-17 10:48:06,006 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2022-10-17 10:48:06,008 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2022-10-17 10:48:06,011 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2022-10-17 10:48:06,013 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2022-10-17 10:48:06,015 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2022-10-17 10:48:06,016 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2022-10-17 10:48:06,018 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2022-10-17 10:48:06,018 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2022-10-17 10:48:06,020 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2022-10-17 10:48:06,022 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2022-10-17 10:48:06,024 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2022-10-17 10:48:06,025 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2022-10-17 10:48:06,026 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2022-10-17 10:48:06,029 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2022-10-17 10:48:06,033 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2022-10-17 10:48:06,035 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2022-10-17 10:48:06,037 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2022-10-17 10:48:06,039 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2022-10-17 10:48:06,040 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2022-10-17 10:48:06,046 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2022-10-17 10:48:06,047 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2022-10-17 10:48:06,047 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2022-10-17 10:48:06,049 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2022-10-17 10:48:06,049 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2022-10-17 10:48:06,051 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2022-10-17 10:48:06,051 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2022-10-17 10:48:06,052 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2022-10-17 10:48:06,054 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2022-10-17 10:48:06,055 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2022-10-17 10:48:06,056 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2022-10-17 10:48:06,056 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2022-10-17 10:48:06,057 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2022-10-17 10:48:06,058 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2022-10-17 10:48:06,058 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2022-10-17 10:48:06,059 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2022-10-17 10:48:06,060 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2022-10-17 10:48:06,061 INFO  L101        SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/config/svcomp-Reach-32bit-Automizer_Default.epf
[2022-10-17 10:48:06,099 INFO  L113        SettingsManager]: Loading preferences was successful
[2022-10-17 10:48:06,101 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2022-10-17 10:48:06,102 INFO  L136        SettingsManager]: Preferences of UltimateCore differ from their defaults:
[2022-10-17 10:48:06,102 INFO  L138        SettingsManager]:  * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR;
[2022-10-17 10:48:06,103 INFO  L136        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2022-10-17 10:48:06,103 INFO  L138        SettingsManager]:  * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS
[2022-10-17 10:48:06,104 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2022-10-17 10:48:06,104 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2022-10-17 10:48:06,104 INFO  L138        SettingsManager]:  * Use SBE=true
[2022-10-17 10:48:06,105 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2022-10-17 10:48:06,105 INFO  L138        SettingsManager]:  * sizeof long=4
[2022-10-17 10:48:06,105 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2022-10-17 10:48:06,105 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2022-10-17 10:48:06,106 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2022-10-17 10:48:06,106 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2022-10-17 10:48:06,106 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2022-10-17 10:48:06,106 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2022-10-17 10:48:06,106 INFO  L138        SettingsManager]:  * sizeof long double=12
[2022-10-17 10:48:06,107 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2022-10-17 10:48:06,107 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2022-10-17 10:48:06,107 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2022-10-17 10:48:06,107 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2022-10-17 10:48:06,108 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2022-10-17 10:48:06,108 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2022-10-17 10:48:06,108 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2022-10-17 10:48:06,108 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2022-10-17 10:48:06,109 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2022-10-17 10:48:06,109 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2022-10-17 10:48:06,109 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2022-10-17 10:48:06,109 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2022-10-17 10:48:06,110 INFO  L138        SettingsManager]:  * Apply one-shot large block encoding in concurrent analysis=false
[2022-10-17 10:48:06,110 INFO  L138        SettingsManager]:  * Automaton type used in concurrency analysis=PETRI_NET
[2022-10-17 10:48:06,110 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2022-10-17 10:48:06,110 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
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_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/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_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ
Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml
Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false
Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) )


Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> 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 -> c55d57654781cf0634666e1c7d4e43dff0d9410f4306aded3e4e446e1f9e88d1
[2022-10-17 10:48:06,473 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2022-10-17 10:48:06,498 INFO  L261   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2022-10-17 10:48:06,502 INFO  L217   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2022-10-17 10:48:06,503 INFO  L271        PluginConnector]: Initializing CDTParser...
[2022-10-17 10:48:06,504 INFO  L275        PluginConnector]: CDTParser initialized
[2022-10-17 10:48:06,506 INFO  L432   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/../../sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound100.c
[2022-10-17 10:48:06,583 INFO  L220              CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/data/e0e1a23f2/3d715b427bc04e9da56e3b86989e6f07/FLAGce1eb192d
[2022-10-17 10:48:07,100 INFO  L306              CDTParser]: Found 1 translation units.
[2022-10-17 10:48:07,101 INFO  L160              CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound100.c
[2022-10-17 10:48:07,109 INFO  L349              CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/data/e0e1a23f2/3d715b427bc04e9da56e3b86989e6f07/FLAGce1eb192d
[2022-10-17 10:48:07,444 INFO  L357              CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/data/e0e1a23f2/3d715b427bc04e9da56e3b86989e6f07
[2022-10-17 10:48:07,447 INFO  L299   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2022-10-17 10:48:07,449 INFO  L131        ToolchainWalker]: Walking toolchain with 6 elements.
[2022-10-17 10:48:07,451 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2022-10-17 10:48:07,452 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2022-10-17 10:48:07,456 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2022-10-17 10:48:07,457 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 10:48:07" (1/1) ...
[2022-10-17 10:48:07,458 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4cc6fcac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:48:07, skipping insertion in model container
[2022-10-17 10:48:07,458 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 17.10 10:48:07" (1/1) ...
[2022-10-17 10:48:07,467 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2022-10-17 10:48:07,487 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2022-10-17 10:48:07,794 WARN  L230   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_7f333e9f-d146-4648-b75c-39a7f7707cfe/sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound100.c[588,601]
[2022-10-17 10:48:07,849 INFO  L210          PostProcessor]: Analyzing one entry point: main
[2022-10-17 10:48:07,863 INFO  L203         MainTranslator]: Completed pre-run
[2022-10-17 10:48:07,885 WARN  L230   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_7f333e9f-d146-4648-b75c-39a7f7707cfe/sv-benchmarks/c/nla-digbench-scaling/cohencu-ll_unwindbound100.c[588,601]
[2022-10-17 10:48:07,917 INFO  L210          PostProcessor]: Analyzing one entry point: main
[2022-10-17 10:48:07,943 INFO  L208         MainTranslator]: Completed translation
[2022-10-17 10:48:07,944 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:48:07 WrapperNode
[2022-10-17 10:48:07,944 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2022-10-17 10:48:07,947 INFO  L113        PluginConnector]: ------------------------Boogie Procedure Inliner----------------------------
[2022-10-17 10:48:07,947 INFO  L271        PluginConnector]: Initializing Boogie Procedure Inliner...
[2022-10-17 10:48:07,947 INFO  L275        PluginConnector]: Boogie Procedure Inliner initialized
[2022-10-17 10:48:07,957 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:48:07" (1/1) ...
[2022-10-17 10:48:07,985 INFO  L185        PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:48:07" (1/1) ...
[2022-10-17 10:48:08,012 INFO  L138                Inliner]: procedures = 14, calls = 18, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 49
[2022-10-17 10:48:08,013 INFO  L132        PluginConnector]: ------------------------ END Boogie Procedure Inliner----------------------------
[2022-10-17 10:48:08,014 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2022-10-17 10:48:08,014 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2022-10-17 10:48:08,014 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2022-10-17 10:48:08,025 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:48:07" (1/1) ...
[2022-10-17 10:48:08,026 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:48:07" (1/1) ...
[2022-10-17 10:48:08,028 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:48:07" (1/1) ...
[2022-10-17 10:48:08,028 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:48:07" (1/1) ...
[2022-10-17 10:48:08,038 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:48:07" (1/1) ...
[2022-10-17 10:48:08,043 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:48:07" (1/1) ...
[2022-10-17 10:48:08,044 INFO  L185        PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:48:07" (1/1) ...
[2022-10-17 10:48:08,053 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:48:07" (1/1) ...
[2022-10-17 10:48:08,056 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2022-10-17 10:48:08,057 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2022-10-17 10:48:08,059 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2022-10-17 10:48:08,060 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2022-10-17 10:48:08,061 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:48:07" (1/1) ...
[2022-10-17 10:48:08,070 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2022-10-17 10:48:08,089 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3
[2022-10-17 10:48:08,104 INFO  L229       MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
[2022-10-17 10:48:08,127 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process
[2022-10-17 10:48:08,156 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit
[2022-10-17 10:48:08,156 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~int
[2022-10-17 10:48:08,157 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2022-10-17 10:48:08,157 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2022-10-17 10:48:08,157 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2022-10-17 10:48:08,157 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2022-10-17 10:48:08,231 INFO  L235             CfgBuilder]: Building ICFG
[2022-10-17 10:48:08,232 INFO  L261             CfgBuilder]: Building CFG for each procedure with an implementation
[2022-10-17 10:48:08,419 INFO  L276             CfgBuilder]: Performing block encoding
[2022-10-17 10:48:08,435 INFO  L295             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2022-10-17 10:48:08,435 INFO  L300             CfgBuilder]: Removed 1 assume(true) statements.
[2022-10-17 10:48:08,437 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 10:48:08 BoogieIcfgContainer
[2022-10-17 10:48:08,438 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2022-10-17 10:48:08,440 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2022-10-17 10:48:08,440 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2022-10-17 10:48:08,446 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2022-10-17 10:48:08,447 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 17.10 10:48:07" (1/3) ...
[2022-10-17 10:48:08,448 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4428fa6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 10:48:08, skipping insertion in model container
[2022-10-17 10:48:08,448 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 17.10 10:48:07" (2/3) ...
[2022-10-17 10:48:08,449 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4428fa6e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 17.10 10:48:08, skipping insertion in model container
[2022-10-17 10:48:08,449 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 17.10 10:48:08" (3/3) ...
[2022-10-17 10:48:08,450 INFO  L112   eAbstractionObserver]: Analyzing ICFG cohencu-ll_unwindbound100.c
[2022-10-17 10:48:08,473 INFO  L203   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2022-10-17 10:48:08,474 INFO  L162   ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations.
[2022-10-17 10:48:08,534 INFO  L356      AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ========
[2022-10-17 10:48:08,543 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=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@5852ff29, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms]
[2022-10-17 10:48:08,544 INFO  L358      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2022-10-17 10:48:08,549 INFO  L276                IsEmpty]: Start isEmpty. Operand  has 26 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 11 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11)
[2022-10-17 10:48:08,557 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 8
[2022-10-17 10:48:08,558 INFO  L187           NwaCegarLoop]: Found error trace
[2022-10-17 10:48:08,559 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1]
[2022-10-17 10:48:08,559 INFO  L420      AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-10-17 10:48:08,566 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-10-17 10:48:08,567 INFO  L85        PathProgramCache]: Analyzing trace with hash 1823967074, now seen corresponding path program 1 times
[2022-10-17 10:48:08,578 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2022-10-17 10:48:08,579 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [475213591]
[2022-10-17 10:48:08,579 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:08,580 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-10-17 10:48:08,686 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2022-10-17 10:48:08,747 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2022-10-17 10:48:08,747 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2022-10-17 10:48:08,748 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [475213591]
[2022-10-17 10:48:08,749 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [475213591] provided 1 perfect and 0 imperfect interpolant sequences
[2022-10-17 10:48:08,749 INFO  L184   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2022-10-17 10:48:08,750 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2
[2022-10-17 10:48:08,752 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379783087]
[2022-10-17 10:48:08,753 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2022-10-17 10:48:08,758 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 2 states
[2022-10-17 10:48:08,759 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2022-10-17 10:48:08,793 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants.
[2022-10-17 10:48:08,794 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2
[2022-10-17 10:48:08,797 INFO  L87              Difference]: Start difference. First operand  has 26 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 13 states have internal predecessors, (17), 11 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Second operand  has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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)
[2022-10-17 10:48:08,826 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-10-17 10:48:08,827 INFO  L93              Difference]: Finished difference Result 50 states and 87 transitions.
[2022-10-17 10:48:08,828 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. 
[2022-10-17 10:48:08,829 INFO  L78                 Accepts]: Start accepts. Automaton has  has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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 7
[2022-10-17 10:48:08,830 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-10-17 10:48:08,839 INFO  L225             Difference]: With dead ends: 50
[2022-10-17 10:48:08,839 INFO  L226             Difference]: Without dead ends: 22
[2022-10-17 10:48:08,844 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2
[2022-10-17 10:48:08,849 INFO  L413           NwaCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time
[2022-10-17 10:48:08,850 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time]
[2022-10-17 10:48:08,872 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 22 states.
[2022-10-17 10:48:08,895 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22.
[2022-10-17 10:48:08,897 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 22 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 11 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10)
[2022-10-17 10:48:08,899 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 33 transitions.
[2022-10-17 10:48:08,901 INFO  L78                 Accepts]: Start accepts. Automaton has 22 states and 33 transitions. Word has length 7
[2022-10-17 10:48:08,902 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-10-17 10:48:08,902 INFO  L495      AbstractCegarLoop]: Abstraction has 22 states and 33 transitions.
[2022-10-17 10:48:08,902 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 2 states, 2 states have (on average 3.0) internal successors, (6), 2 states have internal predecessors, (6), 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)
[2022-10-17 10:48:08,903 INFO  L276                IsEmpty]: Start isEmpty. Operand 22 states and 33 transitions.
[2022-10-17 10:48:08,903 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 9
[2022-10-17 10:48:08,904 INFO  L187           NwaCegarLoop]: Found error trace
[2022-10-17 10:48:08,904 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1]
[2022-10-17 10:48:08,904 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2022-10-17 10:48:08,905 INFO  L420      AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-10-17 10:48:08,906 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-10-17 10:48:08,906 INFO  L85        PathProgramCache]: Analyzing trace with hash 178926099, now seen corresponding path program 1 times
[2022-10-17 10:48:08,906 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2022-10-17 10:48:08,907 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741865287]
[2022-10-17 10:48:08,907 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:08,908 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-10-17 10:48:08,933 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2022-10-17 10:48:09,044 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2022-10-17 10:48:09,045 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2022-10-17 10:48:09,045 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741865287]
[2022-10-17 10:48:09,046 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1741865287] provided 1 perfect and 0 imperfect interpolant sequences
[2022-10-17 10:48:09,046 INFO  L184   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2022-10-17 10:48:09,046 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2022-10-17 10:48:09,047 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426924799]
[2022-10-17 10:48:09,047 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2022-10-17 10:48:09,048 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 4 states
[2022-10-17 10:48:09,049 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2022-10-17 10:48:09,049 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2022-10-17 10:48:09,050 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2022-10-17 10:48:09,050 INFO  L87              Difference]: Start difference. First operand 22 states and 33 transitions. Second operand  has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 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)
[2022-10-17 10:48:09,093 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-10-17 10:48:09,094 INFO  L93              Difference]: Finished difference Result 36 states and 52 transitions.
[2022-10-17 10:48:09,094 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2022-10-17 10:48:09,095 INFO  L78                 Accepts]: Start accepts. Automaton has  has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 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
[2022-10-17 10:48:09,095 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-10-17 10:48:09,096 INFO  L225             Difference]: With dead ends: 36
[2022-10-17 10:48:09,109 INFO  L226             Difference]: Without dead ends: 24
[2022-10-17 10:48:09,110 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2022-10-17 10:48:09,112 INFO  L413           NwaCegarLoop]: 31 mSDtfsCounter, 0 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time
[2022-10-17 10:48:09,113 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 89 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time]
[2022-10-17 10:48:09,115 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 24 states.
[2022-10-17 10:48:09,122 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24.
[2022-10-17 10:48:09,137 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 24 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 11 states have call successors, (11), 1 states have call predecessors, (11), 1 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10)
[2022-10-17 10:48:09,140 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 35 transitions.
[2022-10-17 10:48:09,140 INFO  L78                 Accepts]: Start accepts. Automaton has 24 states and 35 transitions. Word has length 8
[2022-10-17 10:48:09,140 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-10-17 10:48:09,141 INFO  L495      AbstractCegarLoop]: Abstraction has 24 states and 35 transitions.
[2022-10-17 10:48:09,141 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 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)
[2022-10-17 10:48:09,141 INFO  L276                IsEmpty]: Start isEmpty. Operand 24 states and 35 transitions.
[2022-10-17 10:48:09,142 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 9
[2022-10-17 10:48:09,142 INFO  L187           NwaCegarLoop]: Found error trace
[2022-10-17 10:48:09,142 INFO  L195           NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1]
[2022-10-17 10:48:09,143 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2022-10-17 10:48:09,143 INFO  L420      AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-10-17 10:48:09,144 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-10-17 10:48:09,144 INFO  L85        PathProgramCache]: Analyzing trace with hash 180475231, now seen corresponding path program 1 times
[2022-10-17 10:48:09,144 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2022-10-17 10:48:09,145 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2054830416]
[2022-10-17 10:48:09,145 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:09,145 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-10-17 10:48:09,163 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2022-10-17 10:48:09,547 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2022-10-17 10:48:09,548 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2022-10-17 10:48:09,548 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2054830416]
[2022-10-17 10:48:09,548 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2054830416] provided 1 perfect and 0 imperfect interpolant sequences
[2022-10-17 10:48:09,549 INFO  L184   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2022-10-17 10:48:09,549 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2022-10-17 10:48:09,549 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982152857]
[2022-10-17 10:48:09,550 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2022-10-17 10:48:09,550 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2022-10-17 10:48:09,551 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2022-10-17 10:48:09,551 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2022-10-17 10:48:09,552 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2022-10-17 10:48:09,552 INFO  L87              Difference]: Start difference. First operand 24 states and 35 transitions. Second operand  has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 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)
[2022-10-17 10:48:09,684 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-10-17 10:48:09,684 INFO  L93              Difference]: Finished difference Result 30 states and 40 transitions.
[2022-10-17 10:48:09,685 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2022-10-17 10:48:09,685 INFO  L78                 Accepts]: Start accepts. Automaton has  has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 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
[2022-10-17 10:48:09,685 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-10-17 10:48:09,686 INFO  L225             Difference]: With dead ends: 30
[2022-10-17 10:48:09,687 INFO  L226             Difference]: Without dead ends: 28
[2022-10-17 10:48:09,687 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2022-10-17 10:48:09,689 INFO  L413           NwaCegarLoop]: 27 mSDtfsCounter, 8 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2022-10-17 10:48:09,690 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 62 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2022-10-17 10:48:09,691 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 28 states.
[2022-10-17 10:48:09,709 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28.
[2022-10-17 10:48:09,711 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 28 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 11 states have call successors, (11), 2 states have call predecessors, (11), 2 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10)
[2022-10-17 10:48:09,718 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 38 transitions.
[2022-10-17 10:48:09,718 INFO  L78                 Accepts]: Start accepts. Automaton has 28 states and 38 transitions. Word has length 8
[2022-10-17 10:48:09,719 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-10-17 10:48:09,719 INFO  L495      AbstractCegarLoop]: Abstraction has 28 states and 38 transitions.
[2022-10-17 10:48:09,719 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 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)
[2022-10-17 10:48:09,720 INFO  L276                IsEmpty]: Start isEmpty. Operand 28 states and 38 transitions.
[2022-10-17 10:48:09,721 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 14
[2022-10-17 10:48:09,722 INFO  L187           NwaCegarLoop]: Found error trace
[2022-10-17 10:48:09,722 INFO  L195           NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2022-10-17 10:48:09,723 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2022-10-17 10:48:09,723 INFO  L420      AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-10-17 10:48:09,728 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-10-17 10:48:09,728 INFO  L85        PathProgramCache]: Analyzing trace with hash -1275442234, now seen corresponding path program 1 times
[2022-10-17 10:48:09,728 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2022-10-17 10:48:09,729 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [6597061]
[2022-10-17 10:48:09,729 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:09,729 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-10-17 10:48:09,769 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-10-17 10:48:09,770 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [446735035]
[2022-10-17 10:48:09,771 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:09,772 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:09,772 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3
[2022-10-17 10:48:09,778 INFO  L229       MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-10-17 10:48:09,782 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process
[2022-10-17 10:48:09,866 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2022-10-17 10:48:09,868 INFO  L263         TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 7 conjunts are in the unsatisfiable core
[2022-10-17 10:48:09,877 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2022-10-17 10:48:10,040 INFO  L134       CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2022-10-17 10:48:10,041 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2022-10-17 10:48:10,041 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2022-10-17 10:48:10,042 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [6597061]
[2022-10-17 10:48:10,043 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2022-10-17 10:48:10,044 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [446735035]
[2022-10-17 10:48:10,045 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleZ3 [446735035] provided 1 perfect and 0 imperfect interpolant sequences
[2022-10-17 10:48:10,045 INFO  L184   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2022-10-17 10:48:10,045 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2022-10-17 10:48:10,046 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775952466]
[2022-10-17 10:48:10,049 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2022-10-17 10:48:10,053 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2022-10-17 10:48:10,053 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2022-10-17 10:48:10,053 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2022-10-17 10:48:10,054 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2022-10-17 10:48:10,054 INFO  L87              Difference]: Start difference. First operand 28 states and 38 transitions. Second operand  has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)
[2022-10-17 10:48:10,181 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-10-17 10:48:10,181 INFO  L93              Difference]: Finished difference Result 46 states and 66 transitions.
[2022-10-17 10:48:10,182 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2022-10-17 10:48:10,182 INFO  L78                 Accepts]: Start accepts. Automaton has  has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13
[2022-10-17 10:48:10,182 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-10-17 10:48:10,184 INFO  L225             Difference]: With dead ends: 46
[2022-10-17 10:48:10,184 INFO  L226             Difference]: Without dead ends: 44
[2022-10-17 10:48:10,185 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2022-10-17 10:48:10,187 INFO  L413           NwaCegarLoop]: 43 mSDtfsCounter, 6 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2022-10-17 10:48:10,188 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 121 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2022-10-17 10:48:10,189 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 44 states.
[2022-10-17 10:48:10,207 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 34.
[2022-10-17 10:48:10,207 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 34 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 19 states have internal predecessors, (20), 13 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 11 states have call predecessors, (12), 12 states have call successors, (12)
[2022-10-17 10:48:10,209 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 45 transitions.
[2022-10-17 10:48:10,209 INFO  L78                 Accepts]: Start accepts. Automaton has 34 states and 45 transitions. Word has length 13
[2022-10-17 10:48:10,209 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-10-17 10:48:10,210 INFO  L495      AbstractCegarLoop]: Abstraction has 34 states and 45 transitions.
[2022-10-17 10:48:10,210 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1)
[2022-10-17 10:48:10,210 INFO  L276                IsEmpty]: Start isEmpty. Operand 34 states and 45 transitions.
[2022-10-17 10:48:10,211 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 19
[2022-10-17 10:48:10,211 INFO  L187           NwaCegarLoop]: Found error trace
[2022-10-17 10:48:10,212 INFO  L195           NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2022-10-17 10:48:10,258 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0
[2022-10-17 10:48:10,436 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3
[2022-10-17 10:48:10,437 INFO  L420      AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-10-17 10:48:10,438 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-10-17 10:48:10,438 INFO  L85        PathProgramCache]: Analyzing trace with hash 427545983, now seen corresponding path program 1 times
[2022-10-17 10:48:10,439 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2022-10-17 10:48:10,439 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1719119863]
[2022-10-17 10:48:10,439 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:10,440 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-10-17 10:48:10,466 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-10-17 10:48:10,467 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [115103922]
[2022-10-17 10:48:10,467 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:10,468 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:10,468 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3
[2022-10-17 10:48:10,470 INFO  L229       MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-10-17 10:48:10,485 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process
[2022-10-17 10:48:10,543 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2022-10-17 10:48:10,545 INFO  L263         TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 7 conjunts are in the unsatisfiable core
[2022-10-17 10:48:10,550 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2022-10-17 10:48:10,665 INFO  L134       CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked.
[2022-10-17 10:48:10,665 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2022-10-17 10:48:10,665 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2022-10-17 10:48:10,666 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1719119863]
[2022-10-17 10:48:10,666 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2022-10-17 10:48:10,666 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [115103922]
[2022-10-17 10:48:10,666 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleZ3 [115103922] provided 1 perfect and 0 imperfect interpolant sequences
[2022-10-17 10:48:10,667 INFO  L184   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2022-10-17 10:48:10,667 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2022-10-17 10:48:10,667 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [979511348]
[2022-10-17 10:48:10,667 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2022-10-17 10:48:10,668 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2022-10-17 10:48:10,668 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2022-10-17 10:48:10,669 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2022-10-17 10:48:10,669 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2022-10-17 10:48:10,670 INFO  L87              Difference]: Start difference. First operand 34 states and 45 transitions. Second operand  has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2)
[2022-10-17 10:48:10,804 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-10-17 10:48:10,804 INFO  L93              Difference]: Finished difference Result 50 states and 69 transitions.
[2022-10-17 10:48:10,805 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2022-10-17 10:48:10,805 INFO  L78                 Accepts]: Start accepts. Automaton has  has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18
[2022-10-17 10:48:10,806 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-10-17 10:48:10,810 INFO  L225             Difference]: With dead ends: 50
[2022-10-17 10:48:10,811 INFO  L226             Difference]: Without dead ends: 48
[2022-10-17 10:48:10,812 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2022-10-17 10:48:10,817 INFO  L413           NwaCegarLoop]: 43 mSDtfsCounter, 6 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2022-10-17 10:48:10,819 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 125 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2022-10-17 10:48:10,823 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 48 states.
[2022-10-17 10:48:10,852 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 44.
[2022-10-17 10:48:10,852 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 44 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 23 states have internal predecessors, (25), 18 states have call successors, (18), 4 states have call predecessors, (18), 4 states have return successors, (17), 16 states have call predecessors, (17), 17 states have call successors, (17)
[2022-10-17 10:48:10,856 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 60 transitions.
[2022-10-17 10:48:10,856 INFO  L78                 Accepts]: Start accepts. Automaton has 44 states and 60 transitions. Word has length 18
[2022-10-17 10:48:10,856 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-10-17 10:48:10,857 INFO  L495      AbstractCegarLoop]: Abstraction has 44 states and 60 transitions.
[2022-10-17 10:48:10,857 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2)
[2022-10-17 10:48:10,857 INFO  L276                IsEmpty]: Start isEmpty. Operand 44 states and 60 transitions.
[2022-10-17 10:48:10,859 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 24
[2022-10-17 10:48:10,860 INFO  L187           NwaCegarLoop]: Found error trace
[2022-10-17 10:48:10,860 INFO  L195           NwaCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2022-10-17 10:48:10,904 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0
[2022-10-17 10:48:11,073 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:11,074 INFO  L420      AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-10-17 10:48:11,074 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-10-17 10:48:11,075 INFO  L85        PathProgramCache]: Analyzing trace with hash 5607206, now seen corresponding path program 1 times
[2022-10-17 10:48:11,075 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2022-10-17 10:48:11,075 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563020504]
[2022-10-17 10:48:11,075 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:11,076 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-10-17 10:48:11,090 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-10-17 10:48:11,090 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [599294636]
[2022-10-17 10:48:11,090 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:11,091 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:11,091 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3
[2022-10-17 10:48:11,092 INFO  L229       MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-10-17 10:48:11,101 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process
[2022-10-17 10:48:11,150 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2022-10-17 10:48:11,152 INFO  L263         TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 9 conjunts are in the unsatisfiable core
[2022-10-17 10:48:11,154 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2022-10-17 10:48:11,245 INFO  L134       CoverageAnalysis]: Checked inductivity of 18 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked.
[2022-10-17 10:48:11,246 INFO  L324         TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2022-10-17 10:48:11,246 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2022-10-17 10:48:11,246 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563020504]
[2022-10-17 10:48:11,247 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2022-10-17 10:48:11,247 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [599294636]
[2022-10-17 10:48:11,250 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleZ3 [599294636] provided 1 perfect and 0 imperfect interpolant sequences
[2022-10-17 10:48:11,250 INFO  L184   FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences.
[2022-10-17 10:48:11,251 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5
[2022-10-17 10:48:11,251 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1810425278]
[2022-10-17 10:48:11,251 INFO  L85    oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton
[2022-10-17 10:48:11,252 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 5 states
[2022-10-17 10:48:11,252 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2022-10-17 10:48:11,253 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2022-10-17 10:48:11,254 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20
[2022-10-17 10:48:11,254 INFO  L87              Difference]: Start difference. First operand 44 states and 60 transitions. Second operand  has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3)
[2022-10-17 10:48:11,383 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-10-17 10:48:11,383 INFO  L93              Difference]: Finished difference Result 58 states and 75 transitions.
[2022-10-17 10:48:11,384 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2022-10-17 10:48:11,384 INFO  L78                 Accepts]: Start accepts. Automaton has  has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 23
[2022-10-17 10:48:11,384 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-10-17 10:48:11,388 INFO  L225             Difference]: With dead ends: 58
[2022-10-17 10:48:11,388 INFO  L226             Difference]: Without dead ends: 46
[2022-10-17 10:48:11,389 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30
[2022-10-17 10:48:11,393 INFO  L413           NwaCegarLoop]: 42 mSDtfsCounter, 6 mSDsluCounter, 72 mSDsCounter, 0 mSdLazyCounter, 68 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 68 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2022-10-17 10:48:11,397 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 114 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 68 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2022-10-17 10:48:11,398 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 46 states.
[2022-10-17 10:48:11,412 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46.
[2022-10-17 10:48:11,412 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 46 states, 24 states have (on average 1.125) internal successors, (27), 25 states have internal predecessors, (27), 16 states have call successors, (16), 5 states have call predecessors, (16), 5 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15)
[2022-10-17 10:48:11,414 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions.
[2022-10-17 10:48:11,414 INFO  L78                 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 23
[2022-10-17 10:48:11,414 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-10-17 10:48:11,414 INFO  L495      AbstractCegarLoop]: Abstraction has 46 states and 58 transitions.
[2022-10-17 10:48:11,415 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3)
[2022-10-17 10:48:11,415 INFO  L276                IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions.
[2022-10-17 10:48:11,416 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 42
[2022-10-17 10:48:11,417 INFO  L187           NwaCegarLoop]: Found error trace
[2022-10-17 10:48:11,417 INFO  L195           NwaCegarLoop]: trace histogram [7, 6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2022-10-17 10:48:11,463 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0
[2022-10-17 10:48:11,641 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:11,642 INFO  L420      AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-10-17 10:48:11,642 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-10-17 10:48:11,642 INFO  L85        PathProgramCache]: Analyzing trace with hash -1172224904, now seen corresponding path program 1 times
[2022-10-17 10:48:11,642 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2022-10-17 10:48:11,643 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [172596878]
[2022-10-17 10:48:11,643 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:11,643 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-10-17 10:48:11,657 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-10-17 10:48:11,657 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1664957448]
[2022-10-17 10:48:11,657 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:11,658 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:11,658 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3
[2022-10-17 10:48:11,672 INFO  L229       MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-10-17 10:48:11,703 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process
[2022-10-17 10:48:11,753 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2022-10-17 10:48:11,754 INFO  L263         TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 5 conjunts are in the unsatisfiable core
[2022-10-17 10:48:11,763 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2022-10-17 10:48:11,853 INFO  L134       CoverageAnalysis]: Checked inductivity of 74 backedges. 30 proven. 2 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked.
[2022-10-17 10:48:11,854 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2022-10-17 10:48:11,930 INFO  L134       CoverageAnalysis]: Checked inductivity of 74 backedges. 12 proven. 2 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked.
[2022-10-17 10:48:11,931 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2022-10-17 10:48:11,931 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [172596878]
[2022-10-17 10:48:11,931 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2022-10-17 10:48:11,931 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1664957448]
[2022-10-17 10:48:11,931 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1664957448] provided 0 perfect and 2 imperfect interpolant sequences
[2022-10-17 10:48:11,932 INFO  L184   FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences.
[2022-10-17 10:48:11,932 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5] total 8
[2022-10-17 10:48:11,932 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [404976562]
[2022-10-17 10:48:11,932 INFO  L85    oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton
[2022-10-17 10:48:11,933 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 8 states
[2022-10-17 10:48:11,934 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2022-10-17 10:48:11,934 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants.
[2022-10-17 10:48:11,935 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56
[2022-10-17 10:48:11,936 INFO  L87              Difference]: Start difference. First operand 46 states and 58 transitions. Second operand  has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12)
[2022-10-17 10:48:12,167 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-10-17 10:48:12,168 INFO  L93              Difference]: Finished difference Result 116 states and 151 transitions.
[2022-10-17 10:48:12,175 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2022-10-17 10:48:12,175 INFO  L78                 Accepts]: Start accepts. Automaton has  has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 41
[2022-10-17 10:48:12,176 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-10-17 10:48:12,178 INFO  L225             Difference]: With dead ends: 116
[2022-10-17 10:48:12,178 INFO  L226             Difference]: Without dead ends: 100
[2022-10-17 10:48:12,179 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110
[2022-10-17 10:48:12,179 INFO  L413           NwaCegarLoop]: 56 mSDtfsCounter, 65 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 225 SdHoareTripleChecker+Invalid, 133 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time
[2022-10-17 10:48:12,185 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 225 Invalid, 133 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time]
[2022-10-17 10:48:12,187 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 100 states.
[2022-10-17 10:48:12,222 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 96.
[2022-10-17 10:48:12,225 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 96 states, 47 states have (on average 1.148936170212766) internal successors, (54), 50 states have internal predecessors, (54), 38 states have call successors, (38), 10 states have call predecessors, (38), 10 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35)
[2022-10-17 10:48:12,240 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 127 transitions.
[2022-10-17 10:48:12,240 INFO  L78                 Accepts]: Start accepts. Automaton has 96 states and 127 transitions. Word has length 41
[2022-10-17 10:48:12,241 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-10-17 10:48:12,241 INFO  L495      AbstractCegarLoop]: Abstraction has 96 states and 127 transitions.
[2022-10-17 10:48:12,241 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 8 states, 8 states have (on average 3.125) internal successors, (25), 8 states have internal predecessors, (25), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12)
[2022-10-17 10:48:12,241 INFO  L276                IsEmpty]: Start isEmpty. Operand 96 states and 127 transitions.
[2022-10-17 10:48:12,243 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 42
[2022-10-17 10:48:12,243 INFO  L187           NwaCegarLoop]: Found error trace
[2022-10-17 10:48:12,244 INFO  L195           NwaCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2022-10-17 10:48:12,282 INFO  L552       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0
[2022-10-17 10:48:12,466 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:12,466 INFO  L420      AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-10-17 10:48:12,466 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-10-17 10:48:12,466 INFO  L85        PathProgramCache]: Analyzing trace with hash -680109588, now seen corresponding path program 1 times
[2022-10-17 10:48:12,467 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2022-10-17 10:48:12,467 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [762167585]
[2022-10-17 10:48:12,467 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:12,467 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-10-17 10:48:12,480 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-10-17 10:48:12,480 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1764358299]
[2022-10-17 10:48:12,481 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:12,481 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:12,481 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3
[2022-10-17 10:48:12,482 INFO  L229       MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-10-17 10:48:12,497 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process
[2022-10-17 10:48:12,561 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2022-10-17 10:48:12,562 INFO  L263         TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 13 conjunts are in the unsatisfiable core
[2022-10-17 10:48:12,565 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2022-10-17 10:48:12,709 INFO  L134       CoverageAnalysis]: Checked inductivity of 76 backedges. 12 proven. 4 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked.
[2022-10-17 10:48:12,710 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2022-10-17 10:48:12,865 INFO  L134       CoverageAnalysis]: Checked inductivity of 76 backedges. 12 proven. 4 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked.
[2022-10-17 10:48:12,865 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2022-10-17 10:48:12,870 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [762167585]
[2022-10-17 10:48:12,870 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2022-10-17 10:48:12,870 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1764358299]
[2022-10-17 10:48:12,871 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1764358299] provided 0 perfect and 2 imperfect interpolant sequences
[2022-10-17 10:48:12,871 INFO  L184   FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences.
[2022-10-17 10:48:12,871 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8
[2022-10-17 10:48:12,871 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268883141]
[2022-10-17 10:48:12,872 INFO  L85    oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton
[2022-10-17 10:48:12,873 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 8 states
[2022-10-17 10:48:12,874 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2022-10-17 10:48:12,874 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants.
[2022-10-17 10:48:12,875 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56
[2022-10-17 10:48:12,875 INFO  L87              Difference]: Start difference. First operand 96 states and 127 transitions. Second operand  has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 4 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12)
[2022-10-17 10:48:13,788 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-10-17 10:48:13,788 INFO  L93              Difference]: Finished difference Result 114 states and 143 transitions.
[2022-10-17 10:48:13,789 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2022-10-17 10:48:13,789 INFO  L78                 Accepts]: Start accepts. Automaton has  has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 4 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12) Word has length 41
[2022-10-17 10:48:13,790 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-10-17 10:48:13,791 INFO  L225             Difference]: With dead ends: 114
[2022-10-17 10:48:13,792 INFO  L226             Difference]: Without dead ends: 112
[2022-10-17 10:48:13,792 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110
[2022-10-17 10:48:13,793 INFO  L413           NwaCegarLoop]: 38 mSDtfsCounter, 12 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 155 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 155 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time
[2022-10-17 10:48:13,794 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 96 Invalid, 210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 155 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time]
[2022-10-17 10:48:13,794 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 112 states.
[2022-10-17 10:48:13,843 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112.
[2022-10-17 10:48:13,843 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 112 states, 59 states have (on average 1.11864406779661) internal successors, (66), 62 states have internal predecessors, (66), 38 states have call successors, (38), 14 states have call predecessors, (38), 14 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35)
[2022-10-17 10:48:13,845 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 139 transitions.
[2022-10-17 10:48:13,845 INFO  L78                 Accepts]: Start accepts. Automaton has 112 states and 139 transitions. Word has length 41
[2022-10-17 10:48:13,846 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-10-17 10:48:13,846 INFO  L495      AbstractCegarLoop]: Abstraction has 112 states and 139 transitions.
[2022-10-17 10:48:13,846 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 4 states have call successors, (14), 2 states have call predecessors, (14), 1 states have return successors, (12), 4 states have call predecessors, (12), 4 states have call successors, (12)
[2022-10-17 10:48:13,846 INFO  L276                IsEmpty]: Start isEmpty. Operand 112 states and 139 transitions.
[2022-10-17 10:48:13,848 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 47
[2022-10-17 10:48:13,848 INFO  L187           NwaCegarLoop]: Found error trace
[2022-10-17 10:48:13,848 INFO  L195           NwaCegarLoop]: trace histogram [8, 7, 7, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2022-10-17 10:48:13,897 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0
[2022-10-17 10:48:14,061 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:14,062 INFO  L420      AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-10-17 10:48:14,062 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-10-17 10:48:14,062 INFO  L85        PathProgramCache]: Analyzing trace with hash -399462631, now seen corresponding path program 2 times
[2022-10-17 10:48:14,062 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2022-10-17 10:48:14,063 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1942142471]
[2022-10-17 10:48:14,063 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:14,063 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-10-17 10:48:14,076 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-10-17 10:48:14,076 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1720651812]
[2022-10-17 10:48:14,076 INFO  L93    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
[2022-10-17 10:48:14,076 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:14,077 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3
[2022-10-17 10:48:14,093 INFO  L229       MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-10-17 10:48:14,117 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process
[2022-10-17 10:48:14,172 INFO  L228   tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s)
[2022-10-17 10:48:14,172 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2022-10-17 10:48:14,173 INFO  L263         TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 13 conjunts are in the unsatisfiable core
[2022-10-17 10:48:14,177 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2022-10-17 10:48:14,352 INFO  L134       CoverageAnalysis]: Checked inductivity of 103 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked.
[2022-10-17 10:48:14,352 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2022-10-17 10:48:14,477 INFO  L134       CoverageAnalysis]: Checked inductivity of 103 backedges. 14 proven. 5 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked.
[2022-10-17 10:48:14,477 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2022-10-17 10:48:14,477 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1942142471]
[2022-10-17 10:48:14,477 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2022-10-17 10:48:14,478 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1720651812]
[2022-10-17 10:48:14,478 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1720651812] provided 0 perfect and 2 imperfect interpolant sequences
[2022-10-17 10:48:14,478 INFO  L184   FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences.
[2022-10-17 10:48:14,478 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8
[2022-10-17 10:48:14,479 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094824408]
[2022-10-17 10:48:14,479 INFO  L85    oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton
[2022-10-17 10:48:14,481 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 8 states
[2022-10-17 10:48:14,481 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2022-10-17 10:48:14,482 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants.
[2022-10-17 10:48:14,482 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56
[2022-10-17 10:48:14,483 INFO  L87              Difference]: Start difference. First operand 112 states and 139 transitions. Second operand  has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14)
[2022-10-17 10:48:14,739 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-10-17 10:48:14,739 INFO  L93              Difference]: Finished difference Result 118 states and 144 transitions.
[2022-10-17 10:48:14,740 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2022-10-17 10:48:14,740 INFO  L78                 Accepts]: Start accepts. Automaton has  has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) Word has length 46
[2022-10-17 10:48:14,741 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-10-17 10:48:14,742 INFO  L225             Difference]: With dead ends: 118
[2022-10-17 10:48:14,743 INFO  L226             Difference]: Without dead ends: 116
[2022-10-17 10:48:14,743 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72
[2022-10-17 10:48:14,744 INFO  L413           NwaCegarLoop]: 51 mSDtfsCounter, 6 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 139 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time
[2022-10-17 10:48:14,745 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 186 Invalid, 139 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time]
[2022-10-17 10:48:14,746 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 116 states.
[2022-10-17 10:48:14,788 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 116.
[2022-10-17 10:48:14,789 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 116 states, 62 states have (on average 1.1129032258064515) internal successors, (69), 65 states have internal predecessors, (69), 38 states have call successors, (38), 15 states have call predecessors, (38), 15 states have return successors, (35), 35 states have call predecessors, (35), 35 states have call successors, (35)
[2022-10-17 10:48:14,791 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 116 states to 116 states and 142 transitions.
[2022-10-17 10:48:14,791 INFO  L78                 Accepts]: Start accepts. Automaton has 116 states and 142 transitions. Word has length 46
[2022-10-17 10:48:14,792 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-10-17 10:48:14,792 INFO  L495      AbstractCegarLoop]: Abstraction has 116 states and 142 transitions.
[2022-10-17 10:48:14,792 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 4 states have call successors, (16), 2 states have call predecessors, (16), 1 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14)
[2022-10-17 10:48:14,793 INFO  L276                IsEmpty]: Start isEmpty. Operand 116 states and 142 transitions.
[2022-10-17 10:48:14,794 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 52
[2022-10-17 10:48:14,794 INFO  L187           NwaCegarLoop]: Found error trace
[2022-10-17 10:48:14,794 INFO  L195           NwaCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1]
[2022-10-17 10:48:14,839 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0
[2022-10-17 10:48:15,009 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:15,010 INFO  L420      AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-10-17 10:48:15,010 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-10-17 10:48:15,010 INFO  L85        PathProgramCache]: Analyzing trace with hash -1802852916, now seen corresponding path program 3 times
[2022-10-17 10:48:15,010 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2022-10-17 10:48:15,011 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [226317208]
[2022-10-17 10:48:15,011 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:15,011 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-10-17 10:48:15,021 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-10-17 10:48:15,022 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1779054798]
[2022-10-17 10:48:15,022 INFO  L93    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2
[2022-10-17 10:48:15,022 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:15,022 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3
[2022-10-17 10:48:15,040 INFO  L229       MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-10-17 10:48:15,045 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process
[2022-10-17 10:48:15,088 INFO  L228   tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s)
[2022-10-17 10:48:15,088 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2022-10-17 10:48:15,089 INFO  L263         TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 19 conjunts are in the unsatisfiable core
[2022-10-17 10:48:15,092 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2022-10-17 10:48:15,263 INFO  L134       CoverageAnalysis]: Checked inductivity of 134 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked.
[2022-10-17 10:48:15,263 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2022-10-17 10:48:15,514 INFO  L134       CoverageAnalysis]: Checked inductivity of 134 backedges. 16 proven. 6 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked.
[2022-10-17 10:48:15,515 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2022-10-17 10:48:15,515 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [226317208]
[2022-10-17 10:48:15,515 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2022-10-17 10:48:15,515 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1779054798]
[2022-10-17 10:48:15,515 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1779054798] provided 0 perfect and 2 imperfect interpolant sequences
[2022-10-17 10:48:15,515 INFO  L184   FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences.
[2022-10-17 10:48:15,516 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8
[2022-10-17 10:48:15,516 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116855033]
[2022-10-17 10:48:15,516 INFO  L85    oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton
[2022-10-17 10:48:15,517 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 8 states
[2022-10-17 10:48:15,517 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2022-10-17 10:48:15,517 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants.
[2022-10-17 10:48:15,517 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56
[2022-10-17 10:48:15,518 INFO  L87              Difference]: Start difference. First operand 116 states and 142 transitions. Second operand  has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 4 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16)
[2022-10-17 10:48:16,012 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-10-17 10:48:16,012 INFO  L93              Difference]: Finished difference Result 142 states and 164 transitions.
[2022-10-17 10:48:16,012 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2022-10-17 10:48:16,013 INFO  L78                 Accepts]: Start accepts. Automaton has  has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 4 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 51
[2022-10-17 10:48:16,013 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-10-17 10:48:16,015 INFO  L225             Difference]: With dead ends: 142
[2022-10-17 10:48:16,015 INFO  L226             Difference]: Without dead ends: 131
[2022-10-17 10:48:16,016 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 92 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90
[2022-10-17 10:48:16,016 INFO  L413           NwaCegarLoop]: 39 mSDtfsCounter, 11 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 37 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 104 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 37 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time
[2022-10-17 10:48:16,017 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 104 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [37 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time]
[2022-10-17 10:48:16,018 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 131 states.
[2022-10-17 10:48:16,070 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 131.
[2022-10-17 10:48:16,071 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 131 states, 80 states have (on average 1.0875) internal successors, (87), 83 states have internal predecessors, (87), 29 states have call successors, (29), 21 states have call predecessors, (29), 21 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26)
[2022-10-17 10:48:16,072 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 142 transitions.
[2022-10-17 10:48:16,073 INFO  L78                 Accepts]: Start accepts. Automaton has 131 states and 142 transitions. Word has length 51
[2022-10-17 10:48:16,073 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-10-17 10:48:16,073 INFO  L495      AbstractCegarLoop]: Abstraction has 131 states and 142 transitions.
[2022-10-17 10:48:16,073 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 8 states, 8 states have (on average 2.375) internal successors, (19), 7 states have internal predecessors, (19), 4 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16)
[2022-10-17 10:48:16,074 INFO  L276                IsEmpty]: Start isEmpty. Operand 131 states and 142 transitions.
[2022-10-17 10:48:16,075 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 68
[2022-10-17 10:48:16,075 INFO  L187           NwaCegarLoop]: Found error trace
[2022-10-17 10:48:16,075 INFO  L195           NwaCegarLoop]: trace histogram [12, 11, 11, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2022-10-17 10:48:16,121 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0
[2022-10-17 10:48:16,297 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:16,298 INFO  L420      AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-10-17 10:48:16,298 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-10-17 10:48:16,298 INFO  L85        PathProgramCache]: Analyzing trace with hash 616227619, now seen corresponding path program 1 times
[2022-10-17 10:48:16,299 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2022-10-17 10:48:16,299 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80919180]
[2022-10-17 10:48:16,299 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:16,299 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-10-17 10:48:16,312 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-10-17 10:48:16,312 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1868660230]
[2022-10-17 10:48:16,312 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:16,313 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:16,313 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3
[2022-10-17 10:48:16,314 INFO  L229       MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-10-17 10:48:16,323 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process
[2022-10-17 10:48:16,386 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2022-10-17 10:48:16,388 INFO  L263         TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 18 conjunts are in the unsatisfiable core
[2022-10-17 10:48:16,392 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2022-10-17 10:48:16,660 INFO  L134       CoverageAnalysis]: Checked inductivity of 250 backedges. 22 proven. 8 refuted. 0 times theorem prover too weak. 220 trivial. 0 not checked.
[2022-10-17 10:48:16,660 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2022-10-17 10:48:17,182 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2022-10-17 10:48:17,183 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80919180]
[2022-10-17 10:48:17,183 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2022-10-17 10:48:17,183 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1868660230]
[2022-10-17 10:48:17,183 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1868660230] provided 0 perfect and 1 imperfect interpolant sequences
[2022-10-17 10:48:17,184 INFO  L184   FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences.
[2022-10-17 10:48:17,184 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7
[2022-10-17 10:48:17,184 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597379275]
[2022-10-17 10:48:17,184 INFO  L85    oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton
[2022-10-17 10:48:17,185 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 7 states
[2022-10-17 10:48:17,185 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2022-10-17 10:48:17,186 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2022-10-17 10:48:17,186 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90
[2022-10-17 10:48:17,186 INFO  L87              Difference]: Start difference. First operand 131 states and 142 transitions. Second operand  has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11)
[2022-10-17 10:48:17,415 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-10-17 10:48:17,415 INFO  L93              Difference]: Finished difference Result 137 states and 147 transitions.
[2022-10-17 10:48:17,415 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2022-10-17 10:48:17,416 INFO  L78                 Accepts]: Start accepts. Automaton has  has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 67
[2022-10-17 10:48:17,419 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-10-17 10:48:17,421 INFO  L225             Difference]: With dead ends: 137
[2022-10-17 10:48:17,421 INFO  L226             Difference]: Without dead ends: 133
[2022-10-17 10:48:17,423 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 95 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132
[2022-10-17 10:48:17,424 INFO  L413           NwaCegarLoop]: 35 mSDtfsCounter, 6 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time
[2022-10-17 10:48:17,425 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 123 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 134 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time]
[2022-10-17 10:48:17,425 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 133 states.
[2022-10-17 10:48:17,477 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133.
[2022-10-17 10:48:17,478 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 133 states, 82 states have (on average 1.0731707317073171) internal successors, (88), 84 states have internal predecessors, (88), 29 states have call successors, (29), 22 states have call predecessors, (29), 21 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26)
[2022-10-17 10:48:17,482 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 143 transitions.
[2022-10-17 10:48:17,482 INFO  L78                 Accepts]: Start accepts. Automaton has 133 states and 143 transitions. Word has length 67
[2022-10-17 10:48:17,485 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-10-17 10:48:17,485 INFO  L495      AbstractCegarLoop]: Abstraction has 133 states and 143 transitions.
[2022-10-17 10:48:17,486 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (12), 2 states have call predecessors, (12), 1 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11)
[2022-10-17 10:48:17,486 INFO  L276                IsEmpty]: Start isEmpty. Operand 133 states and 143 transitions.
[2022-10-17 10:48:17,494 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 73
[2022-10-17 10:48:17,495 INFO  L187           NwaCegarLoop]: Found error trace
[2022-10-17 10:48:17,495 INFO  L195           NwaCegarLoop]: trace histogram [13, 12, 12, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2022-10-17 10:48:17,537 INFO  L552       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0
[2022-10-17 10:48:17,696 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10
[2022-10-17 10:48:17,697 INFO  L420      AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-10-17 10:48:17,697 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-10-17 10:48:17,697 INFO  L85        PathProgramCache]: Analyzing trace with hash 1808123650, now seen corresponding path program 1 times
[2022-10-17 10:48:17,697 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2022-10-17 10:48:17,697 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1002512434]
[2022-10-17 10:48:17,698 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:17,698 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-10-17 10:48:17,708 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-10-17 10:48:17,708 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [975747039]
[2022-10-17 10:48:17,709 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:17,709 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:17,709 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3
[2022-10-17 10:48:17,710 INFO  L229       MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-10-17 10:48:17,720 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process
[2022-10-17 10:48:17,789 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2022-10-17 10:48:17,790 INFO  L263         TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 15 conjunts are in the unsatisfiable core
[2022-10-17 10:48:17,800 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2022-10-17 10:48:18,058 INFO  L134       CoverageAnalysis]: Checked inductivity of 296 backedges. 24 proven. 8 refuted. 0 times theorem prover too weak. 264 trivial. 0 not checked.
[2022-10-17 10:48:18,059 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2022-10-17 10:48:18,450 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2022-10-17 10:48:18,450 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1002512434]
[2022-10-17 10:48:18,450 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2022-10-17 10:48:18,450 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [975747039]
[2022-10-17 10:48:18,450 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleZ3 [975747039] provided 0 perfect and 1 imperfect interpolant sequences
[2022-10-17 10:48:18,450 INFO  L184   FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences.
[2022-10-17 10:48:18,451 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7
[2022-10-17 10:48:18,451 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628684825]
[2022-10-17 10:48:18,451 INFO  L85    oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton
[2022-10-17 10:48:18,452 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 7 states
[2022-10-17 10:48:18,452 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2022-10-17 10:48:18,452 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2022-10-17 10:48:18,452 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90
[2022-10-17 10:48:18,453 INFO  L87              Difference]: Start difference. First operand 133 states and 143 transitions. Second operand  has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12)
[2022-10-17 10:48:18,669 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-10-17 10:48:18,670 INFO  L93              Difference]: Finished difference Result 135 states and 144 transitions.
[2022-10-17 10:48:18,670 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2022-10-17 10:48:18,671 INFO  L78                 Accepts]: Start accepts. Automaton has  has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12) Word has length 72
[2022-10-17 10:48:18,671 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-10-17 10:48:18,672 INFO  L225             Difference]: With dead ends: 135
[2022-10-17 10:48:18,672 INFO  L226             Difference]: Without dead ends: 124
[2022-10-17 10:48:18,673 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 105 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132
[2022-10-17 10:48:18,674 INFO  L413           NwaCegarLoop]: 44 mSDtfsCounter, 6 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time
[2022-10-17 10:48:18,674 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 153 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time]
[2022-10-17 10:48:18,675 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 124 states.
[2022-10-17 10:48:18,715 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124.
[2022-10-17 10:48:18,716 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 124 states, 77 states have (on average 1.0649350649350648) internal successors, (82), 79 states have internal predecessors, (82), 26 states have call successors, (26), 20 states have call predecessors, (26), 20 states have return successors, (24), 24 states have call predecessors, (24), 24 states have call successors, (24)
[2022-10-17 10:48:18,717 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 132 transitions.
[2022-10-17 10:48:18,717 INFO  L78                 Accepts]: Start accepts. Automaton has 124 states and 132 transitions. Word has length 72
[2022-10-17 10:48:18,718 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-10-17 10:48:18,718 INFO  L495      AbstractCegarLoop]: Abstraction has 124 states and 132 transitions.
[2022-10-17 10:48:18,718 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 7 states, 6 states have (on average 2.3333333333333335) internal successors, (14), 6 states have internal predecessors, (14), 3 states have call successors, (13), 2 states have call predecessors, (13), 1 states have return successors, (12), 3 states have call predecessors, (12), 3 states have call successors, (12)
[2022-10-17 10:48:18,718 INFO  L276                IsEmpty]: Start isEmpty. Operand 124 states and 132 transitions.
[2022-10-17 10:48:18,719 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 75
[2022-10-17 10:48:18,720 INFO  L187           NwaCegarLoop]: Found error trace
[2022-10-17 10:48:18,720 INFO  L195           NwaCegarLoop]: trace histogram [13, 12, 12, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1]
[2022-10-17 10:48:18,767 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0
[2022-10-17 10:48:18,945 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:18,946 INFO  L420      AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-10-17 10:48:18,946 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-10-17 10:48:18,946 INFO  L85        PathProgramCache]: Analyzing trace with hash -207258189, now seen corresponding path program 4 times
[2022-10-17 10:48:18,946 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2022-10-17 10:48:18,946 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998870133]
[2022-10-17 10:48:18,946 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:18,947 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-10-17 10:48:18,960 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-10-17 10:48:18,960 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1439145882]
[2022-10-17 10:48:18,960 INFO  L93    rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST
[2022-10-17 10:48:18,960 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:18,961 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3
[2022-10-17 10:48:18,967 INFO  L229       MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-10-17 10:48:18,972 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process
[2022-10-17 10:48:19,130 INFO  L228   tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s)
[2022-10-17 10:48:19,130 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2022-10-17 10:48:19,132 INFO  L263         TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 49 conjunts are in the unsatisfiable core
[2022-10-17 10:48:19,135 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2022-10-17 10:48:19,551 INFO  L134       CoverageAnalysis]: Checked inductivity of 306 backedges. 99 proven. 51 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked.
[2022-10-17 10:48:19,551 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2022-10-17 10:48:19,984 INFO  L134       CoverageAnalysis]: Checked inductivity of 306 backedges. 109 proven. 9 refuted. 0 times theorem prover too weak. 188 trivial. 0 not checked.
[2022-10-17 10:48:19,984 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2022-10-17 10:48:19,984 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [998870133]
[2022-10-17 10:48:19,985 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2022-10-17 10:48:19,985 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1439145882]
[2022-10-17 10:48:19,985 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1439145882] provided 0 perfect and 2 imperfect interpolant sequences
[2022-10-17 10:48:19,985 INFO  L184   FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences.
[2022-10-17 10:48:19,986 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9] total 14
[2022-10-17 10:48:19,986 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179992836]
[2022-10-17 10:48:19,986 INFO  L85    oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton
[2022-10-17 10:48:19,987 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 14 states
[2022-10-17 10:48:19,987 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2022-10-17 10:48:19,987 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants.
[2022-10-17 10:48:19,988 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=137, Unknown=0, NotChecked=0, Total=182
[2022-10-17 10:48:19,989 INFO  L87              Difference]: Start difference. First operand 124 states and 132 transitions. Second operand  has 14 states, 11 states have (on average 2.272727272727273) internal successors, (25), 9 states have internal predecessors, (25), 8 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (21), 8 states have call predecessors, (21), 7 states have call successors, (21)
[2022-10-17 10:48:20,365 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-10-17 10:48:20,366 INFO  L93              Difference]: Finished difference Result 134 states and 141 transitions.
[2022-10-17 10:48:20,366 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2022-10-17 10:48:20,367 INFO  L78                 Accepts]: Start accepts. Automaton has  has 14 states, 11 states have (on average 2.272727272727273) internal successors, (25), 9 states have internal predecessors, (25), 8 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (21), 8 states have call predecessors, (21), 7 states have call successors, (21) Word has length 74
[2022-10-17 10:48:20,367 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-10-17 10:48:20,368 INFO  L225             Difference]: With dead ends: 134
[2022-10-17 10:48:20,368 INFO  L226             Difference]: Without dead ends: 132
[2022-10-17 10:48:20,369 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 129 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240
[2022-10-17 10:48:20,371 INFO  L413           NwaCegarLoop]: 15 mSDtfsCounter, 20 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 35 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 35 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time
[2022-10-17 10:48:20,371 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 46 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [35 Valid, 107 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time]
[2022-10-17 10:48:20,372 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 132 states.
[2022-10-17 10:48:20,436 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 126.
[2022-10-17 10:48:20,436 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 126 states, 80 states have (on average 1.05) internal successors, (84), 82 states have internal predecessors, (84), 24 states have call successors, (24), 21 states have call predecessors, (24), 21 states have return successors, (23), 22 states have call predecessors, (23), 23 states have call successors, (23)
[2022-10-17 10:48:20,437 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 131 transitions.
[2022-10-17 10:48:20,438 INFO  L78                 Accepts]: Start accepts. Automaton has 126 states and 131 transitions. Word has length 74
[2022-10-17 10:48:20,439 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-10-17 10:48:20,439 INFO  L495      AbstractCegarLoop]: Abstraction has 126 states and 131 transitions.
[2022-10-17 10:48:20,439 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 14 states, 11 states have (on average 2.272727272727273) internal successors, (25), 9 states have internal predecessors, (25), 8 states have call successors, (20), 2 states have call predecessors, (20), 2 states have return successors, (21), 8 states have call predecessors, (21), 7 states have call successors, (21)
[2022-10-17 10:48:20,440 INFO  L276                IsEmpty]: Start isEmpty. Operand 126 states and 131 transitions.
[2022-10-17 10:48:20,447 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 96
[2022-10-17 10:48:20,447 INFO  L187           NwaCegarLoop]: Found error trace
[2022-10-17 10:48:20,447 INFO  L195           NwaCegarLoop]: trace histogram [17, 16, 16, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1]
[2022-10-17 10:48:20,488 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0
[2022-10-17 10:48:20,669 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12
[2022-10-17 10:48:20,670 INFO  L420      AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-10-17 10:48:20,670 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-10-17 10:48:20,670 INFO  L85        PathProgramCache]: Analyzing trace with hash 308615369, now seen corresponding path program 2 times
[2022-10-17 10:48:20,670 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2022-10-17 10:48:20,670 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [662989164]
[2022-10-17 10:48:20,670 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:20,671 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-10-17 10:48:20,683 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-10-17 10:48:20,683 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1579513206]
[2022-10-17 10:48:20,683 INFO  L93    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
[2022-10-17 10:48:20,684 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:20,684 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3
[2022-10-17 10:48:20,685 INFO  L229       MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-10-17 10:48:20,697 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process
[2022-10-17 10:48:20,765 INFO  L228   tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s)
[2022-10-17 10:48:20,765 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2022-10-17 10:48:20,767 INFO  L263         TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 26 conjunts are in the unsatisfiable core
[2022-10-17 10:48:20,771 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2022-10-17 10:48:21,094 INFO  L134       CoverageAnalysis]: Checked inductivity of 536 backedges. 32 proven. 24 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked.
[2022-10-17 10:48:21,094 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2022-10-17 10:48:22,087 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2022-10-17 10:48:22,087 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [662989164]
[2022-10-17 10:48:22,087 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2022-10-17 10:48:22,088 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1579513206]
[2022-10-17 10:48:22,088 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1579513206] provided 0 perfect and 1 imperfect interpolant sequences
[2022-10-17 10:48:22,088 INFO  L184   FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences.
[2022-10-17 10:48:22,088 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8
[2022-10-17 10:48:22,089 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210734870]
[2022-10-17 10:48:22,089 INFO  L85    oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton
[2022-10-17 10:48:22,089 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 8 states
[2022-10-17 10:48:22,089 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2022-10-17 10:48:22,090 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants.
[2022-10-17 10:48:22,090 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110
[2022-10-17 10:48:22,090 INFO  L87              Difference]: Start difference. First operand 126 states and 131 transitions. Second operand  has 8 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16)
[2022-10-17 10:48:22,415 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-10-17 10:48:22,415 INFO  L93              Difference]: Finished difference Result 134 states and 139 transitions.
[2022-10-17 10:48:22,416 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2022-10-17 10:48:22,416 INFO  L78                 Accepts]: Start accepts. Automaton has  has 8 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16) Word has length 95
[2022-10-17 10:48:22,417 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-10-17 10:48:22,418 INFO  L225             Difference]: With dead ends: 134
[2022-10-17 10:48:22,418 INFO  L226             Difference]: Without dead ends: 132
[2022-10-17 10:48:22,418 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 122 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156
[2022-10-17 10:48:22,419 INFO  L413           NwaCegarLoop]: 43 mSDtfsCounter, 6 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 223 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 223 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time
[2022-10-17 10:48:22,420 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 159 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 223 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time]
[2022-10-17 10:48:22,420 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 132 states.
[2022-10-17 10:48:22,473 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131.
[2022-10-17 10:48:22,474 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 131 states, 83 states have (on average 1.0481927710843373) internal successors, (87), 85 states have internal predecessors, (87), 25 states have call successors, (25), 22 states have call predecessors, (25), 22 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24)
[2022-10-17 10:48:22,475 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 136 transitions.
[2022-10-17 10:48:22,475 INFO  L78                 Accepts]: Start accepts. Automaton has 131 states and 136 transitions. Word has length 95
[2022-10-17 10:48:22,475 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-10-17 10:48:22,476 INFO  L495      AbstractCegarLoop]: Abstraction has 131 states and 136 transitions.
[2022-10-17 10:48:22,476 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 8 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (17), 2 states have call predecessors, (17), 1 states have return successors, (16), 4 states have call predecessors, (16), 4 states have call successors, (16)
[2022-10-17 10:48:22,476 INFO  L276                IsEmpty]: Start isEmpty. Operand 131 states and 136 transitions.
[2022-10-17 10:48:22,477 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 101
[2022-10-17 10:48:22,478 INFO  L187           NwaCegarLoop]: Found error trace
[2022-10-17 10:48:22,478 INFO  L195           NwaCegarLoop]: trace histogram [18, 17, 17, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2022-10-17 10:48:22,518 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0
[2022-10-17 10:48:22,705 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13
[2022-10-17 10:48:22,706 INFO  L420      AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-10-17 10:48:22,706 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-10-17 10:48:22,706 INFO  L85        PathProgramCache]: Analyzing trace with hash 75049244, now seen corresponding path program 2 times
[2022-10-17 10:48:22,706 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2022-10-17 10:48:22,706 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016403872]
[2022-10-17 10:48:22,706 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:22,707 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-10-17 10:48:22,725 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-10-17 10:48:22,725 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [94559053]
[2022-10-17 10:48:22,725 INFO  L93    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
[2022-10-17 10:48:22,726 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:22,726 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3
[2022-10-17 10:48:22,727 INFO  L229       MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-10-17 10:48:22,749 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process
[2022-10-17 10:48:22,812 INFO  L228   tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s)
[2022-10-17 10:48:22,812 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2022-10-17 10:48:22,814 INFO  L263         TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 22 conjunts are in the unsatisfiable core
[2022-10-17 10:48:22,817 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2022-10-17 10:48:23,117 INFO  L134       CoverageAnalysis]: Checked inductivity of 602 backedges. 34 proven. 24 refuted. 0 times theorem prover too weak. 544 trivial. 0 not checked.
[2022-10-17 10:48:23,118 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2022-10-17 10:48:23,454 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2022-10-17 10:48:23,454 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016403872]
[2022-10-17 10:48:23,454 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2022-10-17 10:48:23,455 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [94559053]
[2022-10-17 10:48:23,455 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleZ3 [94559053] provided 0 perfect and 1 imperfect interpolant sequences
[2022-10-17 10:48:23,455 INFO  L184   FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences.
[2022-10-17 10:48:23,455 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8
[2022-10-17 10:48:23,458 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [294490556]
[2022-10-17 10:48:23,458 INFO  L85    oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton
[2022-10-17 10:48:23,459 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 8 states
[2022-10-17 10:48:23,459 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2022-10-17 10:48:23,460 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants.
[2022-10-17 10:48:23,460 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110
[2022-10-17 10:48:23,460 INFO  L87              Difference]: Start difference. First operand 131 states and 136 transitions. Second operand  has 8 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 4 states have call predecessors, (17), 4 states have call successors, (17)
[2022-10-17 10:48:23,803 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-10-17 10:48:23,803 INFO  L93              Difference]: Finished difference Result 138 states and 142 transitions.
[2022-10-17 10:48:23,803 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2022-10-17 10:48:23,804 INFO  L78                 Accepts]: Start accepts. Automaton has  has 8 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 4 states have call predecessors, (17), 4 states have call successors, (17) Word has length 100
[2022-10-17 10:48:23,804 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-10-17 10:48:23,805 INFO  L225             Difference]: With dead ends: 138
[2022-10-17 10:48:23,805 INFO  L226             Difference]: Without dead ends: 125
[2022-10-17 10:48:23,808 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156
[2022-10-17 10:48:23,809 INFO  L413           NwaCegarLoop]: 46 mSDtfsCounter, 6 mSDsluCounter, 122 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time
[2022-10-17 10:48:23,810 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 168 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 218 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time]
[2022-10-17 10:48:23,811 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 125 states.
[2022-10-17 10:48:23,863 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125.
[2022-10-17 10:48:23,864 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 125 states, 80 states have (on average 1.0375) internal successors, (83), 81 states have internal predecessors, (83), 23 states have call successors, (23), 21 states have call predecessors, (23), 21 states have return successors, (22), 22 states have call predecessors, (22), 22 states have call successors, (22)
[2022-10-17 10:48:23,865 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 128 transitions.
[2022-10-17 10:48:23,865 INFO  L78                 Accepts]: Start accepts. Automaton has 125 states and 128 transitions. Word has length 100
[2022-10-17 10:48:23,865 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-10-17 10:48:23,866 INFO  L495      AbstractCegarLoop]: Abstraction has 125 states and 128 transitions.
[2022-10-17 10:48:23,866 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 8 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 7 states have internal predecessors, (17), 4 states have call successors, (18), 2 states have call predecessors, (18), 1 states have return successors, (17), 4 states have call predecessors, (17), 4 states have call successors, (17)
[2022-10-17 10:48:23,866 INFO  L276                IsEmpty]: Start isEmpty. Operand 125 states and 128 transitions.
[2022-10-17 10:48:23,869 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 124
[2022-10-17 10:48:23,869 INFO  L187           NwaCegarLoop]: Found error trace
[2022-10-17 10:48:23,869 INFO  L195           NwaCegarLoop]: trace histogram [22, 21, 21, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1]
[2022-10-17 10:48:23,909 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0
[2022-10-17 10:48:24,085 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14
[2022-10-17 10:48:24,086 INFO  L420      AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-10-17 10:48:24,086 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-10-17 10:48:24,086 INFO  L85        PathProgramCache]: Analyzing trace with hash -1859389073, now seen corresponding path program 3 times
[2022-10-17 10:48:24,086 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2022-10-17 10:48:24,087 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [50129835]
[2022-10-17 10:48:24,087 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:24,087 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-10-17 10:48:24,110 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-10-17 10:48:24,125 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1098491296]
[2022-10-17 10:48:24,125 INFO  L93    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2
[2022-10-17 10:48:24,126 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:24,126 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3
[2022-10-17 10:48:24,146 INFO  L229       MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-10-17 10:48:24,169 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process
[2022-10-17 10:48:24,970 INFO  L228   tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s)
[2022-10-17 10:48:24,970 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2022-10-17 10:48:24,973 INFO  L263         TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 13 conjunts are in the unsatisfiable core
[2022-10-17 10:48:24,976 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2022-10-17 10:48:25,191 INFO  L134       CoverageAnalysis]: Checked inductivity of 930 backedges. 110 proven. 16 refuted. 0 times theorem prover too weak. 804 trivial. 0 not checked.
[2022-10-17 10:48:25,192 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2022-10-17 10:48:27,268 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2022-10-17 10:48:27,269 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [50129835]
[2022-10-17 10:48:27,269 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2022-10-17 10:48:27,269 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1098491296]
[2022-10-17 10:48:27,269 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1098491296] provided 0 perfect and 1 imperfect interpolant sequences
[2022-10-17 10:48:27,269 INFO  L184   FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences.
[2022-10-17 10:48:27,269 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9
[2022-10-17 10:48:27,269 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521707695]
[2022-10-17 10:48:27,270 INFO  L85    oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton
[2022-10-17 10:48:27,270 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 9 states
[2022-10-17 10:48:27,270 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2022-10-17 10:48:27,271 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants.
[2022-10-17 10:48:27,271 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=69, Unknown=1, NotChecked=0, Total=90
[2022-10-17 10:48:27,271 INFO  L87              Difference]: Start difference. First operand 125 states and 128 transitions. Second operand  has 9 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11)
[2022-10-17 10:48:28,834 WARN  L539   Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.46s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=false, quantifiers []
[2022-10-17 10:48:33,057 WARN  L539   Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers []
[2022-10-17 10:48:35,061 WARN  L539   Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers []
[2022-10-17 10:48:36,319 WARN  L539   Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.26s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers []
[2022-10-17 10:48:38,323 WARN  L539   Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers []
[2022-10-17 10:48:40,297 WARN  L539   Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.97s for a HTC check with result INVALID. Formula has sorts [Bool, Int], hasArrays=false, hasNonlinArith=true, quantifiers []
[2022-10-17 10:48:40,346 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-10-17 10:48:40,346 INFO  L93              Difference]: Finished difference Result 134 states and 138 transitions.
[2022-10-17 10:48:40,347 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. 
[2022-10-17 10:48:40,347 INFO  L78                 Accepts]: Start accepts. Automaton has  has 9 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11) Word has length 123
[2022-10-17 10:48:40,347 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-10-17 10:48:40,349 INFO  L225             Difference]: With dead ends: 134
[2022-10-17 10:48:40,349 INFO  L226             Difference]: Without dead ends: 132
[2022-10-17 10:48:40,349 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 117 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=36, Invalid=118, Unknown=2, NotChecked=0, Total=156
[2022-10-17 10:48:40,350 INFO  L413           NwaCegarLoop]: 30 mSDtfsCounter, 14 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 201 mSolverCounterSat, 15 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 219 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 201 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.0s IncrementalHoareTripleChecker+Time
[2022-10-17 10:48:40,350 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 101 Invalid, 219 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 201 Invalid, 3 Unknown, 0 Unchecked, 11.0s Time]
[2022-10-17 10:48:40,351 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 132 states.
[2022-10-17 10:48:40,402 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131.
[2022-10-17 10:48:40,402 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 131 states, 83 states have (on average 1.036144578313253) internal successors, (86), 85 states have internal predecessors, (86), 25 states have call successors, (25), 22 states have call predecessors, (25), 22 states have return successors, (24), 23 states have call predecessors, (24), 24 states have call successors, (24)
[2022-10-17 10:48:40,403 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 135 transitions.
[2022-10-17 10:48:40,404 INFO  L78                 Accepts]: Start accepts. Automaton has 131 states and 135 transitions. Word has length 123
[2022-10-17 10:48:40,404 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-10-17 10:48:40,404 INFO  L495      AbstractCegarLoop]: Abstraction has 131 states and 135 transitions.
[2022-10-17 10:48:40,405 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 9 states, 8 states have (on average 2.25) internal successors, (18), 7 states have internal predecessors, (18), 4 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 3 states have call predecessors, (11), 4 states have call successors, (11)
[2022-10-17 10:48:40,405 INFO  L276                IsEmpty]: Start isEmpty. Operand 131 states and 135 transitions.
[2022-10-17 10:48:40,407 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 126
[2022-10-17 10:48:40,407 INFO  L187           NwaCegarLoop]: Found error trace
[2022-10-17 10:48:40,407 INFO  L195           NwaCegarLoop]: trace histogram [22, 21, 21, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1]
[2022-10-17 10:48:40,417 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0
[2022-10-17 10:48:40,613 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15
[2022-10-17 10:48:40,613 INFO  L420      AbstractCegarLoop]: === Iteration 17 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-10-17 10:48:40,614 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-10-17 10:48:40,614 INFO  L85        PathProgramCache]: Analyzing trace with hash -1602424598, now seen corresponding path program 2 times
[2022-10-17 10:48:40,614 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2022-10-17 10:48:40,614 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1285898807]
[2022-10-17 10:48:40,614 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:40,614 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-10-17 10:48:40,634 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-10-17 10:48:40,635 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1858845350]
[2022-10-17 10:48:40,635 INFO  L93    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
[2022-10-17 10:48:40,635 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:40,635 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3
[2022-10-17 10:48:40,636 INFO  L229       MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-10-17 10:48:40,663 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process
[2022-10-17 10:48:40,733 INFO  L228   tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s)
[2022-10-17 10:48:40,733 INFO  L229   tOrderPrioritization]: Conjunction of SSA is unsat
[2022-10-17 10:48:40,735 INFO  L263         TraceCheckSpWp]: Trace formula consists of 296 conjuncts, 11 conjunts are in the unsatisfiable core
[2022-10-17 10:48:40,739 INFO  L286         TraceCheckSpWp]: Computing forward predicates...
[2022-10-17 10:48:40,964 INFO  L134       CoverageAnalysis]: Checked inductivity of 938 backedges. 120 proven. 656 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked.
[2022-10-17 10:48:40,965 INFO  L328         TraceCheckSpWp]: Computing backward predicates...
[2022-10-17 10:48:41,196 INFO  L134       CoverageAnalysis]: Checked inductivity of 938 backedges. 42 proven. 56 refuted. 0 times theorem prover too weak. 840 trivial. 0 not checked.
[2022-10-17 10:48:41,197 INFO  L136   FreeRefinementEngine]: Strategy CAMEL found an infeasible trace
[2022-10-17 10:48:41,197 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1285898807]
[2022-10-17 10:48:41,197 WARN  L310   FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT
[2022-10-17 10:48:41,197 INFO  L333   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1858845350]
[2022-10-17 10:48:41,198 INFO  L157   FreeRefinementEngine]: IpTcStrategyModuleZ3 [1858845350] provided 0 perfect and 2 imperfect interpolant sequences
[2022-10-17 10:48:41,198 INFO  L184   FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences.
[2022-10-17 10:48:41,198 INFO  L197   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 14
[2022-10-17 10:48:41,198 INFO  L121   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878168339]
[2022-10-17 10:48:41,199 INFO  L85    oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton
[2022-10-17 10:48:41,200 INFO  L571      AbstractCegarLoop]: INTERPOLANT automaton has 14 states
[2022-10-17 10:48:41,200 INFO  L100   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2022-10-17 10:48:41,201 INFO  L143   InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants.
[2022-10-17 10:48:41,201 INFO  L145   InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=111, Unknown=0, NotChecked=0, Total=182
[2022-10-17 10:48:41,201 INFO  L87              Difference]: Start difference. First operand 131 states and 135 transitions. Second operand  has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 9 states have call successors, (43), 6 states have call predecessors, (43), 6 states have return successors, (42), 9 states have call predecessors, (42), 9 states have call successors, (42)
[2022-10-17 10:48:41,796 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2022-10-17 10:48:41,797 INFO  L93              Difference]: Finished difference Result 390 states and 406 transitions.
[2022-10-17 10:48:41,797 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. 
[2022-10-17 10:48:41,798 INFO  L78                 Accepts]: Start accepts. Automaton has  has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 9 states have call successors, (43), 6 states have call predecessors, (43), 6 states have return successors, (42), 9 states have call predecessors, (42), 9 states have call successors, (42) Word has length 125
[2022-10-17 10:48:41,798 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2022-10-17 10:48:41,802 INFO  L225             Difference]: With dead ends: 390
[2022-10-17 10:48:41,802 INFO  L226             Difference]: Without dead ends: 365
[2022-10-17 10:48:41,803 INFO  L412           NwaCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 236 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506
[2022-10-17 10:48:41,804 INFO  L413           NwaCegarLoop]: 82 mSDtfsCounter, 159 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 183 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 183 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time
[2022-10-17 10:48:41,804 INFO  L414           NwaCegarLoop]: SdHoareTripleChecker [159 Valid, 258 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 183 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time]
[2022-10-17 10:48:41,805 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 365 states.
[2022-10-17 10:48:41,933 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 313.
[2022-10-17 10:48:41,934 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand  has 313 states, 196 states have (on average 1.0459183673469388) internal successors, (205), 203 states have internal predecessors, (205), 63 states have call successors, (63), 54 states have call predecessors, (63), 53 states have return successors, (61), 55 states have call predecessors, (61), 61 states have call successors, (61)
[2022-10-17 10:48:41,936 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 313 states to 313 states and 329 transitions.
[2022-10-17 10:48:41,937 INFO  L78                 Accepts]: Start accepts. Automaton has 313 states and 329 transitions. Word has length 125
[2022-10-17 10:48:41,939 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2022-10-17 10:48:41,939 INFO  L495      AbstractCegarLoop]: Abstraction has 313 states and 329 transitions.
[2022-10-17 10:48:41,939 INFO  L496      AbstractCegarLoop]: INTERPOLANT automaton has  has 14 states, 14 states have (on average 3.7142857142857144) internal successors, (52), 14 states have internal predecessors, (52), 9 states have call successors, (43), 6 states have call predecessors, (43), 6 states have return successors, (42), 9 states have call predecessors, (42), 9 states have call successors, (42)
[2022-10-17 10:48:41,940 INFO  L276                IsEmpty]: Start isEmpty. Operand 313 states and 329 transitions.
[2022-10-17 10:48:41,941 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 129
[2022-10-17 10:48:41,942 INFO  L187           NwaCegarLoop]: Found error trace
[2022-10-17 10:48:41,942 INFO  L195           NwaCegarLoop]: trace histogram [23, 22, 22, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2022-10-17 10:48:41,982 INFO  L540       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0
[2022-10-17 10:48:42,154 WARN  L477      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16
[2022-10-17 10:48:42,155 INFO  L420      AbstractCegarLoop]: === Iteration 18 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] ===
[2022-10-17 10:48:42,155 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2022-10-17 10:48:42,155 INFO  L85        PathProgramCache]: Analyzing trace with hash 709017654, now seen corresponding path program 3 times
[2022-10-17 10:48:42,155 INFO  L118   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2022-10-17 10:48:42,156 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [457976869]
[2022-10-17 10:48:42,156 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2022-10-17 10:48:42,156 INFO  L127          SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms
[2022-10-17 10:48:42,172 ERROR L245   FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic
[2022-10-17 10:48:42,173 INFO  L333   FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1798049342]
[2022-10-17 10:48:42,173 INFO  L93    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2
[2022-10-17 10:48:42,173 INFO  L173          SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2022-10-17 10:48:42,173 INFO  L189       MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3
[2022-10-17 10:48:42,174 INFO  L229       MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
[2022-10-17 10:48:42,197 INFO  L327       MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7f333e9f-d146-4648-b75c-39a7f7707cfe/bin/uautomizer-J5u9QxTXDZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process