./Ultimate.py --spec ../../sv-benchmarks/c/ReachSafety.prp --file ../../sv-benchmarks/c/loop-acceleration/underapprox_false-unreach-call2_true-termination.i --full-output --architecture 32bit


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


Checking for ERROR reachability
Using default analysis
Version 1dbac8bc
Calling Ultimate with: java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/underapprox_false-unreach-call2_true-termination.i -s /tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(__VERIFIER_error())) )

 --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash c0ad4658b31654787cb281a441e891421d607e94
..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Execution finished normally
Writing output log to file Ultimate.log
Writing human readable error path to file UltimateCounterExample.errorpath
Result:
FALSE
--- Real Ultimate output ---
This is Ultimate 0.1.23-1dbac8b
[2018-10-27 00:59:02,468 INFO  L170        SettingsManager]: Resetting all preferences to default values...
[2018-10-27 00:59:02,469 INFO  L174        SettingsManager]: Resetting UltimateCore preferences to default values
[2018-10-27 00:59:02,477 INFO  L177        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2018-10-27 00:59:02,478 INFO  L174        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2018-10-27 00:59:02,478 INFO  L174        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2018-10-27 00:59:02,480 INFO  L174        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2018-10-27 00:59:02,483 INFO  L174        SettingsManager]: Resetting LassoRanker preferences to default values
[2018-10-27 00:59:02,484 INFO  L174        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2018-10-27 00:59:02,485 INFO  L174        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2018-10-27 00:59:02,486 INFO  L177        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2018-10-27 00:59:02,486 INFO  L174        SettingsManager]: Resetting LTL2Aut preferences to default values
[2018-10-27 00:59:02,486 INFO  L174        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2018-10-27 00:59:02,488 INFO  L174        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2018-10-27 00:59:02,488 INFO  L174        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2018-10-27 00:59:02,489 INFO  L174        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2018-10-27 00:59:02,490 INFO  L174        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2018-10-27 00:59:02,491 INFO  L174        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2018-10-27 00:59:02,493 INFO  L174        SettingsManager]: Resetting CodeCheck preferences to default values
[2018-10-27 00:59:02,494 INFO  L174        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2018-10-27 00:59:02,494 INFO  L174        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2018-10-27 00:59:02,496 INFO  L174        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2018-10-27 00:59:02,497 INFO  L177        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2018-10-27 00:59:02,497 INFO  L177        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2018-10-27 00:59:02,497 INFO  L174        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2018-10-27 00:59:02,498 INFO  L174        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2018-10-27 00:59:02,499 INFO  L174        SettingsManager]: Resetting Boogie Printer preferences to default values
[2018-10-27 00:59:02,500 INFO  L174        SettingsManager]: Resetting ReqPrinter preferences to default values
[2018-10-27 00:59:02,500 INFO  L174        SettingsManager]: Resetting Witness Printer preferences to default values
[2018-10-27 00:59:02,501 INFO  L177        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2018-10-27 00:59:02,501 INFO  L174        SettingsManager]: Resetting CDTParser preferences to default values
[2018-10-27 00:59:02,502 INFO  L177        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2018-10-27 00:59:02,502 INFO  L177        SettingsManager]: ReqParser provides no preferences, ignoring...
[2018-10-27 00:59:02,502 INFO  L174        SettingsManager]: Resetting SmtParser preferences to default values
[2018-10-27 00:59:02,502 INFO  L174        SettingsManager]: Resetting Witness Parser preferences to default values
[2018-10-27 00:59:02,504 INFO  L181        SettingsManager]: Finished resetting all preferences to default values...
[2018-10-27 00:59:02,504 INFO  L98         SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf
[2018-10-27 00:59:02,514 INFO  L110        SettingsManager]: Loading preferences was successful
[2018-10-27 00:59:02,515 INFO  L112        SettingsManager]: Preferences different from defaults after loading the file:
[2018-10-27 00:59:02,516 INFO  L131        SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults:
[2018-10-27 00:59:02,516 INFO  L133        SettingsManager]:  * User list type=DISABLED
[2018-10-27 00:59:02,516 INFO  L133        SettingsManager]:  * calls to implemented procedures=false
[2018-10-27 00:59:02,516 INFO  L131        SettingsManager]: Preferences of Abstract Interpretation differ from their defaults:
[2018-10-27 00:59:02,516 INFO  L133        SettingsManager]:  * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain
[2018-10-27 00:59:02,516 INFO  L133        SettingsManager]:  * Abstract domain=CompoundDomain
[2018-10-27 00:59:02,516 INFO  L133        SettingsManager]:  * Check feasibility of abstract posts with an SMT solver=true
[2018-10-27 00:59:02,517 INFO  L133        SettingsManager]:  * Use the RCFG-of-the-future interface=true
[2018-10-27 00:59:02,517 INFO  L133        SettingsManager]:  * Interval Domain=false
[2018-10-27 00:59:02,517 INFO  L131        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2018-10-27 00:59:02,517 INFO  L133        SettingsManager]:  * sizeof long=4
[2018-10-27 00:59:02,518 INFO  L133        SettingsManager]:  * Overapproximate operations on floating types=true
[2018-10-27 00:59:02,518 INFO  L133        SettingsManager]:  * sizeof POINTER=4
[2018-10-27 00:59:02,518 INFO  L133        SettingsManager]:  * Check division by zero=IGNORE
[2018-10-27 00:59:02,518 INFO  L133        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2018-10-27 00:59:02,518 INFO  L133        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2018-10-27 00:59:02,518 INFO  L133        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2018-10-27 00:59:02,518 INFO  L133        SettingsManager]:  * sizeof long double=12
[2018-10-27 00:59:02,519 INFO  L133        SettingsManager]:  * Check if freed pointer was valid=false
[2018-10-27 00:59:02,519 INFO  L133        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2018-10-27 00:59:02,521 INFO  L131        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2018-10-27 00:59:02,521 INFO  L133        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2018-10-27 00:59:02,521 INFO  L133        SettingsManager]:  * To the following directory=./dump/
[2018-10-27 00:59:02,521 INFO  L133        SettingsManager]:  * SMT solver=External_DefaultMode
[2018-10-27 00:59:02,521 INFO  L133        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2018-10-27 00:59:02,521 INFO  L131        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2018-10-27 00:59:02,522 INFO  L133        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2018-10-27 00:59:02,522 INFO  L133        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2018-10-27 00:59:02,522 INFO  L133        SettingsManager]:  * Trace refinement strategy=TAIPAN
[2018-10-27 00:59:02,522 INFO  L133        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
[2018-10-27 00:59:02,522 INFO  L133        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2018-10-27 00:59:02,522 INFO  L133        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2018-10-27 00:59:02,522 INFO  L133        SettingsManager]:  * Abstract interpretation Mode=USE_PREDICATES
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-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan
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(__VERIFIER_error())) )


Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan
Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit
Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c0ad4658b31654787cb281a441e891421d607e94
[2018-10-27 00:59:02,550 INFO  L81    nceAwareModelManager]: Repository-Root is: /tmp
[2018-10-27 00:59:02,561 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2018-10-27 00:59:02,570 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2018-10-27 00:59:02,571 INFO  L271        PluginConnector]: Initializing CDTParser...
[2018-10-27 00:59:02,572 INFO  L276        PluginConnector]: CDTParser initialized
[2018-10-27 00:59:02,572 INFO  L418   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan/../../sv-benchmarks/c/loop-acceleration/underapprox_false-unreach-call2_true-termination.i
[2018-10-27 00:59:02,618 INFO  L218              CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan/data/4b475aedd/e37e853f00d44da1975b1dfaf01ef62a/FLAGfa3292b92
[2018-10-27 00:59:03,033 INFO  L298              CDTParser]: Found 1 translation units.
[2018-10-27 00:59:03,035 INFO  L158              CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/sv-benchmarks/c/loop-acceleration/underapprox_false-unreach-call2_true-termination.i
[2018-10-27 00:59:03,043 INFO  L346              CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan/data/4b475aedd/e37e853f00d44da1975b1dfaf01ef62a/FLAGfa3292b92
[2018-10-27 00:59:03,058 INFO  L354              CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan/data/4b475aedd/e37e853f00d44da1975b1dfaf01ef62a
[2018-10-27 00:59:03,061 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2018-10-27 00:59:03,064 INFO  L131        ToolchainWalker]: Walking toolchain with 6 elements.
[2018-10-27 00:59:03,064 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2018-10-27 00:59:03,065 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2018-10-27 00:59:03,071 INFO  L276        PluginConnector]: CACSL2BoogieTranslator initialized
[2018-10-27 00:59:03,072 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 12:59:03" (1/1) ...
[2018-10-27 00:59:03,075 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4905e68d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:59:03, skipping insertion in model container
[2018-10-27 00:59:03,075 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 27.10 12:59:03" (1/1) ...
[2018-10-27 00:59:03,085 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2018-10-27 00:59:03,103 INFO  L174         MainTranslator]: Built tables and reachable declarations
[2018-10-27 00:59:03,254 INFO  L202          PostProcessor]: Analyzing one entry point: main
[2018-10-27 00:59:03,258 INFO  L189         MainTranslator]: Completed pre-run
[2018-10-27 00:59:03,272 INFO  L202          PostProcessor]: Analyzing one entry point: main
[2018-10-27 00:59:03,285 INFO  L193         MainTranslator]: Completed translation
[2018-10-27 00:59:03,286 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:59:03 WrapperNode
[2018-10-27 00:59:03,286 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2018-10-27 00:59:03,286 INFO  L113        PluginConnector]: ------------------------Boogie Procedure Inliner----------------------------
[2018-10-27 00:59:03,287 INFO  L271        PluginConnector]: Initializing Boogie Procedure Inliner...
[2018-10-27 00:59:03,287 INFO  L276        PluginConnector]: Boogie Procedure Inliner initialized
[2018-10-27 00:59:03,294 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:59:03" (1/1) ...
[2018-10-27 00:59:03,299 INFO  L185        PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:59:03" (1/1) ...
[2018-10-27 00:59:03,304 INFO  L132        PluginConnector]: ------------------------ END Boogie Procedure Inliner----------------------------
[2018-10-27 00:59:03,305 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2018-10-27 00:59:03,305 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2018-10-27 00:59:03,305 INFO  L276        PluginConnector]: Boogie Preprocessor initialized
[2018-10-27 00:59:03,311 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:59:03" (1/1) ...
[2018-10-27 00:59:03,311 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:59:03" (1/1) ...
[2018-10-27 00:59:03,311 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:59:03" (1/1) ...
[2018-10-27 00:59:03,312 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:59:03" (1/1) ...
[2018-10-27 00:59:03,313 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:59:03" (1/1) ...
[2018-10-27 00:59:03,317 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:59:03" (1/1) ...
[2018-10-27 00:59:03,318 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:59:03" (1/1) ...
[2018-10-27 00:59:03,319 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2018-10-27 00:59:03,319 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2018-10-27 00:59:03,319 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2018-10-27 00:59:03,319 INFO  L276        PluginConnector]: RCFGBuilder initialized
[2018-10-27 00:59:03,320 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:59:03" (1/1) ...
No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan/z3
Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2018-10-27 00:59:03,421 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2018-10-27 00:59:03,422 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2018-10-27 00:59:03,422 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2018-10-27 00:59:03,422 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2018-10-27 00:59:03,422 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2018-10-27 00:59:03,422 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2018-10-27 00:59:03,422 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2018-10-27 00:59:03,422 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2018-10-27 00:59:03,531 INFO  L341             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2018-10-27 00:59:03,531 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 12:59:03 BoogieIcfgContainer
[2018-10-27 00:59:03,531 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2018-10-27 00:59:03,532 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2018-10-27 00:59:03,532 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2018-10-27 00:59:03,534 INFO  L276        PluginConnector]: TraceAbstraction initialized
[2018-10-27 00:59:03,535 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 27.10 12:59:03" (1/3) ...
[2018-10-27 00:59:03,536 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23870fa0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 12:59:03, skipping insertion in model container
[2018-10-27 00:59:03,536 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 27.10 12:59:03" (2/3) ...
[2018-10-27 00:59:03,537 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23870fa0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 27.10 12:59:03, skipping insertion in model container
[2018-10-27 00:59:03,537 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 12:59:03" (3/3) ...
[2018-10-27 00:59:03,538 INFO  L112   eAbstractionObserver]: Analyzing ICFG underapprox_false-unreach-call2_true-termination.i
[2018-10-27 00:59:03,547 INFO  L136   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2018-10-27 00:59:03,553 INFO  L148   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2018-10-27 00:59:03,563 INFO  L257      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2018-10-27 00:59:03,590 INFO  L382      AbstractCegarLoop]: Interprodecural is true
[2018-10-27 00:59:03,591 INFO  L383      AbstractCegarLoop]: Hoare is true
[2018-10-27 00:59:03,591 INFO  L384      AbstractCegarLoop]: Compute interpolants for FPandBP
[2018-10-27 00:59:03,591 INFO  L385      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2018-10-27 00:59:03,591 INFO  L386      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2018-10-27 00:59:03,591 INFO  L387      AbstractCegarLoop]: Difference is false
[2018-10-27 00:59:03,591 INFO  L388      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2018-10-27 00:59:03,591 INFO  L393      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2018-10-27 00:59:03,609 INFO  L276                IsEmpty]: Start isEmpty. Operand 18 states.
[2018-10-27 00:59:03,614 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 11
[2018-10-27 00:59:03,614 INFO  L367         BasicCegarLoop]: Found error trace
[2018-10-27 00:59:03,615 INFO  L375         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2018-10-27 00:59:03,625 INFO  L424      AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2018-10-27 00:59:03,629 INFO  L141       PredicateUnifier]: Initialized classic predicate unifier
[2018-10-27 00:59:03,629 INFO  L82        PathProgramCache]: Analyzing trace with hash -10373566, now seen corresponding path program 1 times
[2018-10-27 00:59:03,631 INFO  L69    tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy
[2018-10-27 00:59:03,671 INFO  L119   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2018-10-27 00:59:03,671 INFO  L103   rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2018-10-27 00:59:03,671 INFO  L119   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2018-10-27 00:59:03,671 INFO  L288   anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation)
[2018-10-27 00:59:03,691 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2018-10-27 00:59:03,712 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2018-10-27 00:59:03,714 INFO  L312   seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2018-10-27 00:59:03,714 INFO  L327   seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2
[2018-10-27 00:59:03,714 INFO  L258   anRefinementStrategy]: Using the first perfect interpolant sequence
[2018-10-27 00:59:03,718 INFO  L460      AbstractCegarLoop]: Interpolant automaton has 2 states
[2018-10-27 00:59:03,729 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants.
[2018-10-27 00:59:03,729 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2
[2018-10-27 00:59:03,731 INFO  L87              Difference]: Start difference. First operand 18 states. Second operand 2 states.
[2018-10-27 00:59:03,749 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2018-10-27 00:59:03,749 INFO  L93              Difference]: Finished difference Result 29 states and 32 transitions.
[2018-10-27 00:59:03,749 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. 
[2018-10-27 00:59:03,750 INFO  L78                 Accepts]: Start accepts. Automaton has 2 states. Word has length 10
[2018-10-27 00:59:03,750 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2018-10-27 00:59:03,755 INFO  L225             Difference]: With dead ends: 29
[2018-10-27 00:59:03,755 INFO  L226             Difference]: Without dead ends: 12
[2018-10-27 00:59:03,758 INFO  L605         BasicCegarLoop]: 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
[2018-10-27 00:59:03,773 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 12 states.
[2018-10-27 00:59:03,786 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12.
[2018-10-27 00:59:03,787 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 12 states.
[2018-10-27 00:59:03,788 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions.
[2018-10-27 00:59:03,789 INFO  L78                 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10
[2018-10-27 00:59:03,789 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2018-10-27 00:59:03,790 INFO  L481      AbstractCegarLoop]: Abstraction has 12 states and 12 transitions.
[2018-10-27 00:59:03,790 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 2 states.
[2018-10-27 00:59:03,790 INFO  L276                IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions.
[2018-10-27 00:59:03,790 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 12
[2018-10-27 00:59:03,790 INFO  L367         BasicCegarLoop]: Found error trace
[2018-10-27 00:59:03,790 INFO  L375         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2018-10-27 00:59:03,792 INFO  L424      AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2018-10-27 00:59:03,792 INFO  L141       PredicateUnifier]: Initialized classic predicate unifier
[2018-10-27 00:59:03,792 INFO  L82        PathProgramCache]: Analyzing trace with hash -571410792, now seen corresponding path program 1 times
[2018-10-27 00:59:03,793 INFO  L69    tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy
[2018-10-27 00:59:03,794 INFO  L119   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2018-10-27 00:59:03,794 INFO  L103   rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2018-10-27 00:59:03,794 INFO  L119   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2018-10-27 00:59:03,795 INFO  L288   anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation)
[2018-10-27 00:59:03,808 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2018-10-27 00:59:03,925 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2018-10-27 00:59:03,925 INFO  L312   seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2018-10-27 00:59:03,925 INFO  L327   seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3
[2018-10-27 00:59:03,925 INFO  L258   anRefinementStrategy]: Using the first perfect interpolant sequence
[2018-10-27 00:59:03,927 INFO  L460      AbstractCegarLoop]: Interpolant automaton has 3 states
[2018-10-27 00:59:03,927 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants.
[2018-10-27 00:59:03,927 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2018-10-27 00:59:03,927 INFO  L87              Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states.
[2018-10-27 00:59:03,964 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2018-10-27 00:59:03,964 INFO  L93              Difference]: Finished difference Result 19 states and 19 transitions.
[2018-10-27 00:59:03,964 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2018-10-27 00:59:03,964 INFO  L78                 Accepts]: Start accepts. Automaton has 3 states. Word has length 11
[2018-10-27 00:59:03,965 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2018-10-27 00:59:03,965 INFO  L225             Difference]: With dead ends: 19
[2018-10-27 00:59:03,965 INFO  L226             Difference]: Without dead ends: 14
[2018-10-27 00:59:03,966 INFO  L605         BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6
[2018-10-27 00:59:03,966 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 14 states.
[2018-10-27 00:59:03,968 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14.
[2018-10-27 00:59:03,968 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 14 states.
[2018-10-27 00:59:03,968 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions.
[2018-10-27 00:59:03,968 INFO  L78                 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11
[2018-10-27 00:59:03,969 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2018-10-27 00:59:03,969 INFO  L481      AbstractCegarLoop]: Abstraction has 14 states and 14 transitions.
[2018-10-27 00:59:03,969 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 3 states.
[2018-10-27 00:59:03,969 INFO  L276                IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions.
[2018-10-27 00:59:03,969 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 14
[2018-10-27 00:59:03,969 INFO  L367         BasicCegarLoop]: Found error trace
[2018-10-27 00:59:03,969 INFO  L375         BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2018-10-27 00:59:03,970 INFO  L424      AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2018-10-27 00:59:03,970 INFO  L141       PredicateUnifier]: Initialized classic predicate unifier
[2018-10-27 00:59:03,970 INFO  L82        PathProgramCache]: Analyzing trace with hash 1625028318, now seen corresponding path program 1 times
[2018-10-27 00:59:03,970 INFO  L69    tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy
[2018-10-27 00:59:03,973 INFO  L119   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2018-10-27 00:59:03,973 INFO  L103   rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2018-10-27 00:59:03,973 INFO  L119   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2018-10-27 00:59:03,973 INFO  L288   anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation)
[2018-10-27 00:59:03,980 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2018-10-27 00:59:04,101 INFO  L134       CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2018-10-27 00:59:04,102 INFO  L300   seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more.
[2018-10-27 00:59:04,102 INFO  L194   anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION
[2018-10-27 00:59:04,103 INFO  L200      CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: 
[2018-10-27 00:59:04,104 INFO  L202      CegarAbsIntRunner]: [0], [4], [8], [12], [14], [20], [23], [25], [31], [32], [33], [35]
[2018-10-27 00:59:04,142 INFO  L148    AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain]
[2018-10-27 00:59:04,142 INFO  L101         FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2)
[2018-10-27 00:59:04,234 WARN  L79         EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation.
[2018-10-27 00:59:04,374 INFO  L263    AbstractInterpreter]: Some error location(s) were reachable
[2018-10-27 00:59:04,375 INFO  L272    AbstractInterpreter]: Visited 12 different actions 64 times. Merged at 3 different actions 25 times. Widened at 1 different actions 5 times. Found 1 fixpoints after 1 different actions. Largest state had 3 variables.
[2018-10-27 00:59:04,392 INFO  L141       PredicateUnifier]: Initialized classic predicate unifier
[2018-10-27 00:59:04,393 INFO  L422   seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown
[2018-10-27 00:59:04,393 INFO  L300   seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more.
[2018-10-27 00:59:04,393 INFO  L194   anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG
No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan/z3
Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000
[2018-10-27 00:59:04,402 INFO  L103   rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2018-10-27 00:59:04,402 INFO  L288   anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP)
[2018-10-27 00:59:04,423 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2018-10-27 00:59:04,427 INFO  L273         TraceCheckSpWp]: Computing forward predicates...
[2018-10-27 00:59:04,464 INFO  L134       CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2018-10-27 00:59:04,464 INFO  L316         TraceCheckSpWp]: Computing backward predicates...
[2018-10-27 00:59:04,610 INFO  L134       CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2018-10-27 00:59:04,639 INFO  L312   seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences.
[2018-10-27 00:59:04,639 INFO  L327   seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 6] total 8
[2018-10-27 00:59:04,639 INFO  L251   anRefinementStrategy]: Using the first two imperfect interpolant sequences
[2018-10-27 00:59:04,639 INFO  L460      AbstractCegarLoop]: Interpolant automaton has 4 states
[2018-10-27 00:59:04,640 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2018-10-27 00:59:04,640 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56
[2018-10-27 00:59:04,640 INFO  L87              Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states.
[2018-10-27 00:59:04,704 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2018-10-27 00:59:04,704 INFO  L93              Difference]: Finished difference Result 21 states and 21 transitions.
[2018-10-27 00:59:04,704 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2018-10-27 00:59:04,704 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 13
[2018-10-27 00:59:04,705 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2018-10-27 00:59:04,705 INFO  L225             Difference]: With dead ends: 21
[2018-10-27 00:59:04,705 INFO  L226             Difference]: Without dead ends: 16
[2018-10-27 00:59:04,706 INFO  L605         BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 20 SyntacticMatches, 4 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56
[2018-10-27 00:59:04,706 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 16 states.
[2018-10-27 00:59:04,708 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16.
[2018-10-27 00:59:04,708 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 16 states.
[2018-10-27 00:59:04,708 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions.
[2018-10-27 00:59:04,709 INFO  L78                 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13
[2018-10-27 00:59:04,709 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2018-10-27 00:59:04,709 INFO  L481      AbstractCegarLoop]: Abstraction has 16 states and 16 transitions.
[2018-10-27 00:59:04,709 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2018-10-27 00:59:04,709 INFO  L276                IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions.
[2018-10-27 00:59:04,710 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 16
[2018-10-27 00:59:04,710 INFO  L367         BasicCegarLoop]: Found error trace
[2018-10-27 00:59:04,710 INFO  L375         BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2018-10-27 00:59:04,710 INFO  L424      AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2018-10-27 00:59:04,710 INFO  L141       PredicateUnifier]: Initialized classic predicate unifier
[2018-10-27 00:59:04,710 INFO  L82        PathProgramCache]: Analyzing trace with hash -720896604, now seen corresponding path program 2 times
[2018-10-27 00:59:04,710 INFO  L69    tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy
[2018-10-27 00:59:04,711 INFO  L119   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2018-10-27 00:59:04,711 INFO  L103   rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2018-10-27 00:59:04,711 INFO  L119   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2018-10-27 00:59:04,711 INFO  L288   anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation)
[2018-10-27 00:59:04,724 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2018-10-27 00:59:04,914 INFO  L134       CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2018-10-27 00:59:04,915 INFO  L300   seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more.
[2018-10-27 00:59:04,915 INFO  L194   anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION
[2018-10-27 00:59:04,916 INFO  L184      CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program
[2018-10-27 00:59:04,916 INFO  L422   seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints
[2018-10-27 00:59:04,916 INFO  L300   seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more.
[2018-10-27 00:59:04,916 INFO  L194   anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG
No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan/z3
Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000
[2018-10-27 00:59:04,933 INFO  L103   rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2
[2018-10-27 00:59:04,933 INFO  L288   anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP)
[2018-10-27 00:59:04,945 INFO  L249   tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s)
[2018-10-27 00:59:04,946 INFO  L250   tOrderPrioritization]: Conjunction of SSA is unsat
[2018-10-27 00:59:04,947 INFO  L273         TraceCheckSpWp]: Computing forward predicates...
[2018-10-27 00:59:04,988 INFO  L134       CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2018-10-27 00:59:04,988 INFO  L316         TraceCheckSpWp]: Computing backward predicates...
[2018-10-27 00:59:05,103 INFO  L134       CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2018-10-27 00:59:05,119 INFO  L312   seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences.
[2018-10-27 00:59:05,119 INFO  L327   seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 7] total 10
[2018-10-27 00:59:05,119 INFO  L251   anRefinementStrategy]: Using the first two imperfect interpolant sequences
[2018-10-27 00:59:05,120 INFO  L460      AbstractCegarLoop]: Interpolant automaton has 5 states
[2018-10-27 00:59:05,120 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants.
[2018-10-27 00:59:05,120 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90
[2018-10-27 00:59:05,120 INFO  L87              Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states.
[2018-10-27 00:59:05,192 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2018-10-27 00:59:05,192 INFO  L93              Difference]: Finished difference Result 23 states and 23 transitions.
[2018-10-27 00:59:05,193 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2018-10-27 00:59:05,193 INFO  L78                 Accepts]: Start accepts. Automaton has 5 states. Word has length 15
[2018-10-27 00:59:05,193 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2018-10-27 00:59:05,193 INFO  L225             Difference]: With dead ends: 23
[2018-10-27 00:59:05,193 INFO  L226             Difference]: Without dead ends: 18
[2018-10-27 00:59:05,194 INFO  L605         BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 23 SyntacticMatches, 4 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90
[2018-10-27 00:59:05,194 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 18 states.
[2018-10-27 00:59:05,196 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18.
[2018-10-27 00:59:05,197 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 18 states.
[2018-10-27 00:59:05,197 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions.
[2018-10-27 00:59:05,197 INFO  L78                 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15
[2018-10-27 00:59:05,197 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2018-10-27 00:59:05,198 INFO  L481      AbstractCegarLoop]: Abstraction has 18 states and 18 transitions.
[2018-10-27 00:59:05,198 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 5 states.
[2018-10-27 00:59:05,198 INFO  L276                IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions.
[2018-10-27 00:59:05,198 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 18
[2018-10-27 00:59:05,198 INFO  L367         BasicCegarLoop]: Found error trace
[2018-10-27 00:59:05,198 INFO  L375         BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2018-10-27 00:59:05,199 INFO  L424      AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2018-10-27 00:59:05,201 INFO  L141       PredicateUnifier]: Initialized classic predicate unifier
[2018-10-27 00:59:05,201 INFO  L82        PathProgramCache]: Analyzing trace with hash -296916246, now seen corresponding path program 3 times
[2018-10-27 00:59:05,201 INFO  L69    tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy
[2018-10-27 00:59:05,202 INFO  L119   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2018-10-27 00:59:05,202 INFO  L101   rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY
[2018-10-27 00:59:05,202 INFO  L119   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2018-10-27 00:59:05,203 INFO  L288   anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation)
[2018-10-27 00:59:05,212 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2018-10-27 00:59:05,297 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2018-10-27 00:59:05,298 INFO  L300   seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more.
[2018-10-27 00:59:05,298 INFO  L194   anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION
[2018-10-27 00:59:05,298 INFO  L184      CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program
[2018-10-27 00:59:05,298 INFO  L422   seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints
[2018-10-27 00:59:05,298 INFO  L300   seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more.
[2018-10-27 00:59:05,298 INFO  L194   anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG
No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan/z3
Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000
[2018-10-27 00:59:05,308 INFO  L103   rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST
[2018-10-27 00:59:05,309 INFO  L288   anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP)
[2018-10-27 00:59:05,319 INFO  L249   tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s)
[2018-10-27 00:59:05,319 INFO  L250   tOrderPrioritization]: Conjunction of SSA is unsat
[2018-10-27 00:59:05,320 INFO  L273         TraceCheckSpWp]: Computing forward predicates...
[2018-10-27 00:59:05,333 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2018-10-27 00:59:05,333 INFO  L316         TraceCheckSpWp]: Computing backward predicates...
[2018-10-27 00:59:05,596 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2018-10-27 00:59:05,620 INFO  L312   seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences.
[2018-10-27 00:59:05,620 INFO  L327   seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 8] total 12
[2018-10-27 00:59:05,620 INFO  L251   anRefinementStrategy]: Using the first two imperfect interpolant sequences
[2018-10-27 00:59:05,620 INFO  L460      AbstractCegarLoop]: Interpolant automaton has 6 states
[2018-10-27 00:59:05,620 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2018-10-27 00:59:05,621 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132
[2018-10-27 00:59:05,621 INFO  L87              Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states.
[2018-10-27 00:59:05,816 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2018-10-27 00:59:05,816 INFO  L93              Difference]: Finished difference Result 25 states and 25 transitions.
[2018-10-27 00:59:05,818 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2018-10-27 00:59:05,818 INFO  L78                 Accepts]: Start accepts. Automaton has 6 states. Word has length 17
[2018-10-27 00:59:05,818 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2018-10-27 00:59:05,818 INFO  L225             Difference]: With dead ends: 25
[2018-10-27 00:59:05,818 INFO  L226             Difference]: Without dead ends: 20
[2018-10-27 00:59:05,819 INFO  L605         BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 26 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132
[2018-10-27 00:59:05,819 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 20 states.
[2018-10-27 00:59:05,821 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20.
[2018-10-27 00:59:05,822 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 20 states.
[2018-10-27 00:59:05,822 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions.
[2018-10-27 00:59:05,822 INFO  L78                 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17
[2018-10-27 00:59:05,822 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2018-10-27 00:59:05,823 INFO  L481      AbstractCegarLoop]: Abstraction has 20 states and 20 transitions.
[2018-10-27 00:59:05,823 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 6 states.
[2018-10-27 00:59:05,823 INFO  L276                IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions.
[2018-10-27 00:59:05,823 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 20
[2018-10-27 00:59:05,823 INFO  L367         BasicCegarLoop]: Found error trace
[2018-10-27 00:59:05,823 INFO  L375         BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2018-10-27 00:59:05,824 INFO  L424      AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2018-10-27 00:59:05,824 INFO  L141       PredicateUnifier]: Initialized classic predicate unifier
[2018-10-27 00:59:05,824 INFO  L82        PathProgramCache]: Analyzing trace with hash -873685328, now seen corresponding path program 4 times
[2018-10-27 00:59:05,824 INFO  L69    tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy
[2018-10-27 00:59:05,825 INFO  L119   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2018-10-27 00:59:05,825 INFO  L101   rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY
[2018-10-27 00:59:05,825 INFO  L119   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2018-10-27 00:59:05,825 INFO  L288   anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation)
[2018-10-27 00:59:05,833 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2018-10-27 00:59:05,926 INFO  L134       CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2018-10-27 00:59:05,926 INFO  L300   seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more.
[2018-10-27 00:59:05,926 INFO  L194   anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION
[2018-10-27 00:59:05,926 INFO  L184      CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program
[2018-10-27 00:59:05,926 INFO  L422   seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints
[2018-10-27 00:59:05,927 INFO  L300   seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more.
[2018-10-27 00:59:05,927 INFO  L194   anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG
No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan/z3
Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000
[2018-10-27 00:59:05,933 INFO  L103   rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2018-10-27 00:59:05,933 INFO  L288   anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP)
[2018-10-27 00:59:05,955 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2018-10-27 00:59:05,957 INFO  L273         TraceCheckSpWp]: Computing forward predicates...
[2018-10-27 00:59:05,970 INFO  L134       CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2018-10-27 00:59:05,970 INFO  L316         TraceCheckSpWp]: Computing backward predicates...
[2018-10-27 00:59:06,093 INFO  L134       CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2018-10-27 00:59:06,110 INFO  L312   seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences.
[2018-10-27 00:59:06,111 INFO  L327   seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 9] total 14
[2018-10-27 00:59:06,111 INFO  L251   anRefinementStrategy]: Using the first two imperfect interpolant sequences
[2018-10-27 00:59:06,111 INFO  L460      AbstractCegarLoop]: Interpolant automaton has 7 states
[2018-10-27 00:59:06,111 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2018-10-27 00:59:06,111 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182
[2018-10-27 00:59:06,112 INFO  L87              Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states.
[2018-10-27 00:59:06,158 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2018-10-27 00:59:06,158 INFO  L93              Difference]: Finished difference Result 27 states and 27 transitions.
[2018-10-27 00:59:06,159 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. 
[2018-10-27 00:59:06,159 INFO  L78                 Accepts]: Start accepts. Automaton has 7 states. Word has length 19
[2018-10-27 00:59:06,159 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2018-10-27 00:59:06,160 INFO  L225             Difference]: With dead ends: 27
[2018-10-27 00:59:06,160 INFO  L226             Difference]: Without dead ends: 22
[2018-10-27 00:59:06,160 INFO  L605         BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 29 SyntacticMatches, 4 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=135, Unknown=0, NotChecked=0, Total=182
[2018-10-27 00:59:06,160 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 22 states.
[2018-10-27 00:59:06,162 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22.
[2018-10-27 00:59:06,163 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 22 states.
[2018-10-27 00:59:06,163 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions.
[2018-10-27 00:59:06,163 INFO  L78                 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19
[2018-10-27 00:59:06,164 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2018-10-27 00:59:06,164 INFO  L481      AbstractCegarLoop]: Abstraction has 22 states and 22 transitions.
[2018-10-27 00:59:06,164 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 7 states.
[2018-10-27 00:59:06,164 INFO  L276                IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions.
[2018-10-27 00:59:06,164 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 22
[2018-10-27 00:59:06,164 INFO  L367         BasicCegarLoop]: Found error trace
[2018-10-27 00:59:06,165 INFO  L375         BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2018-10-27 00:59:06,165 INFO  L424      AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2018-10-27 00:59:06,165 INFO  L141       PredicateUnifier]: Initialized classic predicate unifier
[2018-10-27 00:59:06,165 INFO  L82        PathProgramCache]: Analyzing trace with hash -1097991946, now seen corresponding path program 5 times
[2018-10-27 00:59:06,165 INFO  L69    tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy
[2018-10-27 00:59:06,166 INFO  L119   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2018-10-27 00:59:06,166 INFO  L103   rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2018-10-27 00:59:06,166 INFO  L119   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2018-10-27 00:59:06,166 INFO  L288   anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation)
[2018-10-27 00:59:06,175 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2018-10-27 00:59:06,258 INFO  L134       CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2018-10-27 00:59:06,259 INFO  L300   seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more.
[2018-10-27 00:59:06,259 INFO  L194   anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION
[2018-10-27 00:59:06,259 INFO  L184      CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program
[2018-10-27 00:59:06,259 INFO  L422   seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints
[2018-10-27 00:59:06,259 INFO  L300   seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more.
[2018-10-27 00:59:06,259 INFO  L194   anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG
No working directory specified, using /tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan/z3
Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000
[2018-10-27 00:59:06,266 INFO  L103   rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2
[2018-10-27 00:59:06,267 INFO  L288   anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP)
[2018-10-27 00:59:06,280 INFO  L249   tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s)
[2018-10-27 00:59:06,280 INFO  L250   tOrderPrioritization]: Conjunction of SSA is unsat
[2018-10-27 00:59:06,281 INFO  L273         TraceCheckSpWp]: Computing forward predicates...
[2018-10-27 00:59:06,289 INFO  L134       CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2018-10-27 00:59:06,289 INFO  L316         TraceCheckSpWp]: Computing backward predicates...
[2018-10-27 00:59:06,525 INFO  L134       CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2018-10-27 00:59:06,541 INFO  L312   seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences.
[2018-10-27 00:59:06,542 INFO  L327   seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 10] total 16
[2018-10-27 00:59:06,542 INFO  L251   anRefinementStrategy]: Using the first two imperfect interpolant sequences
[2018-10-27 00:59:06,542 INFO  L460      AbstractCegarLoop]: Interpolant automaton has 8 states
[2018-10-27 00:59:06,542 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants.
[2018-10-27 00:59:06,543 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240
[2018-10-27 00:59:06,543 INFO  L87              Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states.
[2018-10-27 00:59:06,589 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2018-10-27 00:59:06,589 INFO  L93              Difference]: Finished difference Result 29 states and 29 transitions.
[2018-10-27 00:59:06,590 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2018-10-27 00:59:06,590 INFO  L78                 Accepts]: Start accepts. Automaton has 8 states. Word has length 21
[2018-10-27 00:59:06,590 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2018-10-27 00:59:06,591 INFO  L225             Difference]: With dead ends: 29
[2018-10-27 00:59:06,591 INFO  L226             Difference]: Without dead ends: 24
[2018-10-27 00:59:06,591 INFO  L605         BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 32 SyntacticMatches, 4 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=60, Invalid=180, Unknown=0, NotChecked=0, Total=240
[2018-10-27 00:59:06,591 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 24 states.
[2018-10-27 00:59:06,593 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24.
[2018-10-27 00:59:06,593 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 24 states.
[2018-10-27 00:59:06,593 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions.
[2018-10-27 00:59:06,594 INFO  L78                 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21
[2018-10-27 00:59:06,594 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2018-10-27 00:59:06,594 INFO  L481      AbstractCegarLoop]: Abstraction has 24 states and 24 transitions.
[2018-10-27 00:59:06,594 INFO  L482      AbstractCegarLoop]: Interpolant automaton has 8 states.
[2018-10-27 00:59:06,594 INFO  L276                IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions.
[2018-10-27 00:59:06,594 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 24
[2018-10-27 00:59:06,595 INFO  L367         BasicCegarLoop]: Found error trace
[2018-10-27 00:59:06,595 INFO  L375         BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2018-10-27 00:59:06,596 INFO  L424      AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2018-10-27 00:59:06,596 INFO  L141       PredicateUnifier]: Initialized classic predicate unifier
[2018-10-27 00:59:06,597 INFO  L82        PathProgramCache]: Analyzing trace with hash -1908287044, now seen corresponding path program 6 times
[2018-10-27 00:59:06,597 INFO  L69    tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy
[2018-10-27 00:59:06,597 INFO  L119   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2018-10-27 00:59:06,598 INFO  L101   rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY
[2018-10-27 00:59:06,598 INFO  L119   rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY
[2018-10-27 00:59:06,598 INFO  L288   anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation)
[2018-10-27 00:59:06,608 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2018-10-27 00:59:06,616 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2018-10-27 00:59:06,627 INFO  L442         BasicCegarLoop]: Counterexample might be feasible
[2018-10-27 00:59:06,644 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 27.10 12:59:06 BoogieIcfgContainer
[2018-10-27 00:59:06,645 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2018-10-27 00:59:06,645 INFO  L113        PluginConnector]: ------------------------Witness Printer----------------------------
[2018-10-27 00:59:06,645 INFO  L271        PluginConnector]: Initializing Witness Printer...
[2018-10-27 00:59:06,645 INFO  L276        PluginConnector]: Witness Printer initialized
[2018-10-27 00:59:06,646 INFO  L185        PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 27.10 12:59:03" (3/4) ...
[2018-10-27 00:59:06,648 INFO  L138         WitnessPrinter]: Generating witness for reachability counterexample
[2018-10-27 00:59:06,687 INFO  L145         WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/working_dir_41793cd3-4337-4336-b357-bb64e222e9d8/bin-2019/utaipan/witness.graphml
[2018-10-27 00:59:06,687 INFO  L132        PluginConnector]: ------------------------ END Witness Printer----------------------------
[2018-10-27 00:59:06,688 INFO  L168              Benchmark]: Toolchain (without parser) took 3625.23 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 171.4 MB). Free memory was 954.4 MB in the beginning and 947.4 MB in the end (delta: 7.0 MB). Peak memory consumption was 178.5 MB. Max. memory is 11.5 GB.
[2018-10-27 00:59:06,689 INFO  L168              Benchmark]: CDTParser took 0.15 ms. Allocated memory is still 1.0 GB. Free memory is still 980.0 MB. There was no memory consumed. Max. memory is 11.5 GB.
[2018-10-27 00:59:06,690 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 221.63 ms. Allocated memory is still 1.0 GB. Free memory was 954.4 MB in the beginning and 942.4 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 11.5 GB.
[2018-10-27 00:59:06,690 INFO  L168              Benchmark]: Boogie Procedure Inliner took 18.02 ms. Allocated memory is still 1.0 GB. Free memory is still 942.4 MB. There was no memory consumed. Max. memory is 11.5 GB.
[2018-10-27 00:59:06,690 INFO  L168              Benchmark]: Boogie Preprocessor took 14.19 ms. Allocated memory is still 1.0 GB. Free memory was 942.4 MB in the beginning and 939.7 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB.
[2018-10-27 00:59:06,691 INFO  L168              Benchmark]: RCFGBuilder took 212.17 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 171.4 MB). Free memory was 939.7 MB in the beginning and 1.2 GB in the end (delta: -220.9 MB). Peak memory consumption was 21.0 MB. Max. memory is 11.5 GB.
[2018-10-27 00:59:06,691 INFO  L168              Benchmark]: TraceAbstraction took 3112.68 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 950.8 MB in the end (delta: 209.8 MB). Peak memory consumption was 209.8 MB. Max. memory is 11.5 GB.
[2018-10-27 00:59:06,691 INFO  L168              Benchmark]: Witness Printer took 42.42 ms. Allocated memory is still 1.2 GB. Free memory was 950.8 MB in the beginning and 947.4 MB in the end (delta: 3.3 MB). Peak memory consumption was 3.3 MB. Max. memory is 11.5 GB.
[2018-10-27 00:59:06,693 INFO  L336   ainManager$Toolchain]: #######################  End [Toolchain 1] #######################
 --- Results ---
 * Results from de.uni_freiburg.informatik.ultimate.core:
  - StatisticsResult: Toolchain Benchmarks
    Benchmark results are:
 * CDTParser took 0.15 ms. Allocated memory is still 1.0 GB. Free memory is still 980.0 MB. There was no memory consumed. Max. memory is 11.5 GB.
 * CACSL2BoogieTranslator took 221.63 ms. Allocated memory is still 1.0 GB. Free memory was 954.4 MB in the beginning and 942.4 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.1 MB. Max. memory is 11.5 GB.
 * Boogie Procedure Inliner took 18.02 ms. Allocated memory is still 1.0 GB. Free memory is still 942.4 MB. There was no memory consumed. Max. memory is 11.5 GB.
 * Boogie Preprocessor took 14.19 ms. Allocated memory is still 1.0 GB. Free memory was 942.4 MB in the beginning and 939.7 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB.
 * RCFGBuilder took 212.17 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 171.4 MB). Free memory was 939.7 MB in the beginning and 1.2 GB in the end (delta: -220.9 MB). Peak memory consumption was 21.0 MB. Max. memory is 11.5 GB.
 * TraceAbstraction took 3112.68 ms. Allocated memory is still 1.2 GB. Free memory was 1.2 GB in the beginning and 950.8 MB in the end (delta: 209.8 MB). Peak memory consumption was 209.8 MB. Max. memory is 11.5 GB.
 * Witness Printer took 42.42 ms. Allocated memory is still 1.2 GB. Free memory was 950.8 MB in the beginning and 947.4 MB in the end (delta: 3.3 MB). Peak memory consumption was 3.3 MB. Max. memory is 11.5 GB.
 * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction:
  - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable
    a call of __VERIFIER_error() is reachable
We found a FailurePath: 
[L9]               unsigned int x = 0;
[L10]              unsigned int y = 1;
       VAL         [x=0, y=1]
[L11]  COND TRUE   x < 6
[L12]              x++
[L13]              y *= 2
       VAL         [x=1, y=2]
[L11]  COND TRUE   x < 6
[L12]              x++
[L13]              y *= 2
       VAL         [x=2, y=4]
[L11]  COND TRUE   x < 6
[L12]              x++
[L13]              y *= 2
       VAL         [x=3, y=8]
[L11]  COND TRUE   x < 6
[L12]              x++
[L13]              y *= 2
       VAL         [x=4, y=16]
[L11]  COND TRUE   x < 6
[L12]              x++
[L13]              y *= 2
       VAL         [x=5, y=32]
[L11]  COND TRUE   x < 6
[L12]              x++
[L13]              y *= 2
       VAL         [x=6, y=64]
[L11]  COND FALSE  !(x < 6)
       VAL         [x=6, y=64]
[L15]  CALL        __VERIFIER_assert(x != 6)
       VAL         [\old(cond)=0]
[L3]   COND TRUE   !(cond)
       VAL         [\old(cond)=0, cond=0]
[L4]               __VERIFIER_error()
       VAL         [\old(cond)=0, cond=0]

  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 4 procedures, 18 locations, 1 error locations. UNSAFE Result, 3.0s OverallTime, 8 OverallIterations, 7 TraceHistogramMax, 0.5s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 99 SDtfs, 0 SDslu, 239 SDs, 0 SdLazy, 133 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 206 GetRequests, 134 SyntacticMatches, 21 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.2s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.7s InterpolantComputationTime, 214 NumberOfCodeBlocks, 214 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 259 ConstructedInterpolants, 0 QuantifiedInterpolants, 17741 SizeOfPredicates, 0 NumberOfNonLiveVariables, 215 ConjunctsInSsa, 75 ConjunctsInUnsatCore, 17 InterpolantComputations, 2 PerfectInterpolantSequences, 0/210 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available
RESULT: Ultimate proved your program to be incorrect!
Received shutdown request...