./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-ext3-properties/sll_length_check-1.i --full-output --architecture 32bit


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


Checking for ERROR reachability
Using default analysis
Version f470102c
Calling Ultimate with: /usr/lib/jvm/java-8-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_d9c1b617-a12a-440b-bf2d-55a636fec65a/bin/uautomizer/data/config -Xmx12G -Xms1G -jar /tmp/vcloud-vcloud-master/worker/run_dir_d9c1b617-a12a-440b-bf2d-55a636fec65a/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_d9c1b617-a12a-440b-bf2d-55a636fec65a/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_d9c1b617-a12a-440b-bf2d-55a636fec65a/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/list-ext3-properties/sll_length_check-1.i -s /tmp/vcloud-vcloud-master/worker/run_dir_d9c1b617-a12a-440b-bf2d-55a636fec65a/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_d9c1b617-a12a-440b-bf2d-55a636fec65a/bin/uautomizer --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 Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 2a99c5e1922c5e2d2ce50e982def02dab2dbd81e
................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
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 0.1.25-f470102
[2019-12-07 12:54:19,168 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2019-12-07 12:54:19,170 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2019-12-07 12:54:19,179 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2019-12-07 12:54:19,180 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2019-12-07 12:54:19,180 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2019-12-07 12:54:19,181 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2019-12-07 12:54:19,183 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2019-12-07 12:54:19,184 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2019-12-07 12:54:19,185 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2019-12-07 12:54:19,186 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2019-12-07 12:54:19,186 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2019-12-07 12:54:19,187 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2019-12-07 12:54:19,187 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2019-12-07 12:54:19,188 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2019-12-07 12:54:19,189 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2019-12-07 12:54:19,189 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2019-12-07 12:54:19,190 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2019-12-07 12:54:19,191 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2019-12-07 12:54:19,193 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2019-12-07 12:54:19,194 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2019-12-07 12:54:19,194 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2019-12-07 12:54:19,195 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2019-12-07 12:54:19,195 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2019-12-07 12:54:19,197 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2019-12-07 12:54:19,197 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2019-12-07 12:54:19,197 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2019-12-07 12:54:19,198 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2019-12-07 12:54:19,198 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2019-12-07 12:54:19,199 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2019-12-07 12:54:19,199 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2019-12-07 12:54:19,199 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2019-12-07 12:54:19,200 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2019-12-07 12:54:19,200 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2019-12-07 12:54:19,201 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2019-12-07 12:54:19,201 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2019-12-07 12:54:19,201 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2019-12-07 12:54:19,201 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2019-12-07 12:54:19,201 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2019-12-07 12:54:19,202 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2019-12-07 12:54:19,202 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2019-12-07 12:54:19,203 INFO  L101        SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_d9c1b617-a12a-440b-bf2d-55a636fec65a/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf
[2019-12-07 12:54:19,212 INFO  L113        SettingsManager]: Loading preferences was successful
[2019-12-07 12:54:19,212 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2019-12-07 12:54:19,212 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2019-12-07 12:54:19,213 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2019-12-07 12:54:19,213 INFO  L138        SettingsManager]:  * Use SBE=true
[2019-12-07 12:54:19,213 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2019-12-07 12:54:19,213 INFO  L138        SettingsManager]:  * sizeof long=4
[2019-12-07 12:54:19,213 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2019-12-07 12:54:19,213 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2019-12-07 12:54:19,213 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2019-12-07 12:54:19,213 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2019-12-07 12:54:19,213 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2019-12-07 12:54:19,214 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2019-12-07 12:54:19,214 INFO  L138        SettingsManager]:  * sizeof long double=12
[2019-12-07 12:54:19,214 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2019-12-07 12:54:19,214 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2019-12-07 12:54:19,214 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2019-12-07 12:54:19,214 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2019-12-07 12:54:19,214 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2019-12-07 12:54:19,214 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2019-12-07 12:54:19,214 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2019-12-07 12:54:19,214 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2019-12-07 12:54:19,215 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2019-12-07 12:54:19,215 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2019-12-07 12:54:19,215 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2019-12-07 12:54:19,215 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2019-12-07 12:54:19,215 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2019-12-07 12:54:19,215 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2019-12-07 12:54:19,215 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2019-12-07 12:54:19,215 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
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/run_dir_d9c1b617-a12a-440b-bf2d-55a636fec65a/bin/uautomizer
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 -> 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 -> 2a99c5e1922c5e2d2ce50e982def02dab2dbd81e
[2019-12-07 12:54:19,319 INFO  L81    nceAwareModelManager]: Repository-Root is: /tmp
[2019-12-07 12:54:19,329 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2019-12-07 12:54:19,332 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2019-12-07 12:54:19,333 INFO  L271        PluginConnector]: Initializing CDTParser...
[2019-12-07 12:54:19,333 INFO  L275        PluginConnector]: CDTParser initialized
[2019-12-07 12:54:19,334 INFO  L428   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_d9c1b617-a12a-440b-bf2d-55a636fec65a/bin/uautomizer/../../sv-benchmarks/c/list-ext3-properties/sll_length_check-1.i
[2019-12-07 12:54:19,377 INFO  L220              CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_d9c1b617-a12a-440b-bf2d-55a636fec65a/bin/uautomizer/data/4073e34e5/144b9c4bfdf843178d884ea456469596/FLAG3b9e99e48
[2019-12-07 12:54:19,831 INFO  L306              CDTParser]: Found 1 translation units.
[2019-12-07 12:54:19,831 INFO  L160              CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_d9c1b617-a12a-440b-bf2d-55a636fec65a/sv-benchmarks/c/list-ext3-properties/sll_length_check-1.i
[2019-12-07 12:54:19,840 INFO  L349              CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_d9c1b617-a12a-440b-bf2d-55a636fec65a/bin/uautomizer/data/4073e34e5/144b9c4bfdf843178d884ea456469596/FLAG3b9e99e48
[2019-12-07 12:54:19,849 INFO  L357              CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_d9c1b617-a12a-440b-bf2d-55a636fec65a/bin/uautomizer/data/4073e34e5/144b9c4bfdf843178d884ea456469596
[2019-12-07 12:54:19,851 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2019-12-07 12:54:19,852 INFO  L131        ToolchainWalker]: Walking toolchain with 6 elements.
[2019-12-07 12:54:19,853 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2019-12-07 12:54:19,853 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2019-12-07 12:54:19,855 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2019-12-07 12:54:19,855 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 12:54:19" (1/1) ...
[2019-12-07 12:54:19,857 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28319585 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:54:19, skipping insertion in model container
[2019-12-07 12:54:19,857 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.12 12:54:19" (1/1) ...
[2019-12-07 12:54:19,861 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2019-12-07 12:54:19,884 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2019-12-07 12:54:20,102 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2019-12-07 12:54:20,108 INFO  L203         MainTranslator]: Completed pre-run
[2019-12-07 12:54:20,144 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2019-12-07 12:54:20,178 INFO  L208         MainTranslator]: Completed translation
[2019-12-07 12:54:20,178 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:54:20 WrapperNode
[2019-12-07 12:54:20,178 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2019-12-07 12:54:20,179 INFO  L113        PluginConnector]: ------------------------Boogie Procedure Inliner----------------------------
[2019-12-07 12:54:20,179 INFO  L271        PluginConnector]: Initializing Boogie Procedure Inliner...
[2019-12-07 12:54:20,179 INFO  L275        PluginConnector]: Boogie Procedure Inliner initialized
[2019-12-07 12:54:20,184 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:54:20" (1/1) ...
[2019-12-07 12:54:20,195 INFO  L185        PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:54:20" (1/1) ...
[2019-12-07 12:54:20,211 INFO  L132        PluginConnector]: ------------------------ END Boogie Procedure Inliner----------------------------
[2019-12-07 12:54:20,211 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2019-12-07 12:54:20,211 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2019-12-07 12:54:20,212 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2019-12-07 12:54:20,217 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:54:20" (1/1) ...
[2019-12-07 12:54:20,217 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:54:20" (1/1) ...
[2019-12-07 12:54:20,220 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:54:20" (1/1) ...
[2019-12-07 12:54:20,220 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:54:20" (1/1) ...
[2019-12-07 12:54:20,225 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:54:20" (1/1) ...
[2019-12-07 12:54:20,229 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:54:20" (1/1) ...
[2019-12-07 12:54:20,230 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:54:20" (1/1) ...
[2019-12-07 12:54:20,232 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2019-12-07 12:54:20,232 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2019-12-07 12:54:20,232 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2019-12-07 12:54:20,232 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2019-12-07 12:54:20,233 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:54:20" (1/1) ...
No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d9c1b617-a12a-440b-bf2d-55a636fec65a/bin/uautomizer/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
[2019-12-07 12:54:20,271 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap
[2019-12-07 12:54:20,272 INFO  L130     BoogieDeclarations]: Found specification of procedure write~$Pointer$
[2019-12-07 12:54:20,272 INFO  L130     BoogieDeclarations]: Found specification of procedure read~$Pointer$
[2019-12-07 12:54:20,272 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc
[2019-12-07 12:54:20,272 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2019-12-07 12:54:20,272 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2019-12-07 12:54:20,432 INFO  L282             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2019-12-07 12:54:20,432 INFO  L287             CfgBuilder]: Removed 16 assume(true) statements.
[2019-12-07 12:54:20,433 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 12:54:20 BoogieIcfgContainer
[2019-12-07 12:54:20,433 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2019-12-07 12:54:20,433 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2019-12-07 12:54:20,433 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2019-12-07 12:54:20,435 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2019-12-07 12:54:20,435 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.12 12:54:19" (1/3) ...
[2019-12-07 12:54:20,436 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41102c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 12:54:20, skipping insertion in model container
[2019-12-07 12:54:20,436 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.12 12:54:20" (2/3) ...
[2019-12-07 12:54:20,436 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41102c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.12 12:54:20, skipping insertion in model container
[2019-12-07 12:54:20,436 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 12:54:20" (3/3) ...
[2019-12-07 12:54:20,437 INFO  L109   eAbstractionObserver]: Analyzing ICFG sll_length_check-1.i
[2019-12-07 12:54:20,444 INFO  L156   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION
[2019-12-07 12:54:20,448 INFO  L168   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2019-12-07 12:54:20,455 INFO  L249      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2019-12-07 12:54:20,469 INFO  L373      AbstractCegarLoop]: Interprodecural is true
[2019-12-07 12:54:20,470 INFO  L374      AbstractCegarLoop]: Hoare is true
[2019-12-07 12:54:20,470 INFO  L375      AbstractCegarLoop]: Compute interpolants for FPandBP
[2019-12-07 12:54:20,470 INFO  L376      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2019-12-07 12:54:20,470 INFO  L377      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2019-12-07 12:54:20,470 INFO  L378      AbstractCegarLoop]: Difference is false
[2019-12-07 12:54:20,470 INFO  L379      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2019-12-07 12:54:20,470 INFO  L383      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2019-12-07 12:54:20,479 INFO  L276                IsEmpty]: Start isEmpty. Operand 23 states.
[2019-12-07 12:54:20,483 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 13
[2019-12-07 12:54:20,483 INFO  L402         BasicCegarLoop]: Found error trace
[2019-12-07 12:54:20,483 INFO  L410         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2019-12-07 12:54:20,483 INFO  L410      AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2019-12-07 12:54:20,487 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2019-12-07 12:54:20,487 INFO  L82        PathProgramCache]: Analyzing trace with hash -1050078975, now seen corresponding path program 1 times
[2019-12-07 12:54:20,492 INFO  L163   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2019-12-07 12:54:20,493 INFO  L348   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208093419]
[2019-12-07 12:54:20,493 INFO  L94    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2019-12-07 12:54:20,548 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2019-12-07 12:54:20,567 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2019-12-07 12:54:20,568 INFO  L348   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208093419]
[2019-12-07 12:54:20,568 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2019-12-07 12:54:20,569 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2
[2019-12-07 12:54:20,570 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122060854]
[2019-12-07 12:54:20,572 INFO  L442      AbstractCegarLoop]: Interpolant automaton has 2 states
[2019-12-07 12:54:20,573 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2019-12-07 12:54:20,581 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants.
[2019-12-07 12:54:20,581 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2
[2019-12-07 12:54:20,582 INFO  L87              Difference]: Start difference. First operand 23 states. Second operand 2 states.
[2019-12-07 12:54:20,594 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2019-12-07 12:54:20,594 INFO  L93              Difference]: Finished difference Result 41 states and 58 transitions.
[2019-12-07 12:54:20,594 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. 
[2019-12-07 12:54:20,595 INFO  L78                 Accepts]: Start accepts. Automaton has 2 states. Word has length 12
[2019-12-07 12:54:20,595 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2019-12-07 12:54:20,601 INFO  L225             Difference]: With dead ends: 41
[2019-12-07 12:54:20,601 INFO  L226             Difference]: Without dead ends: 17
[2019-12-07 12:54:20,603 INFO  L630         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
[2019-12-07 12:54:20,614 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 17 states.
[2019-12-07 12:54:20,622 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17.
[2019-12-07 12:54:20,623 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 17 states.
[2019-12-07 12:54:20,624 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 20 transitions.
[2019-12-07 12:54:20,624 INFO  L78                 Accepts]: Start accepts. Automaton has 17 states and 20 transitions. Word has length 12
[2019-12-07 12:54:20,625 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2019-12-07 12:54:20,625 INFO  L462      AbstractCegarLoop]: Abstraction has 17 states and 20 transitions.
[2019-12-07 12:54:20,625 INFO  L463      AbstractCegarLoop]: Interpolant automaton has 2 states.
[2019-12-07 12:54:20,625 INFO  L276                IsEmpty]: Start isEmpty. Operand 17 states and 20 transitions.
[2019-12-07 12:54:20,625 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 15
[2019-12-07 12:54:20,625 INFO  L402         BasicCegarLoop]: Found error trace
[2019-12-07 12:54:20,625 INFO  L410         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2019-12-07 12:54:20,626 INFO  L410      AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2019-12-07 12:54:20,626 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2019-12-07 12:54:20,626 INFO  L82        PathProgramCache]: Analyzing trace with hash 924106356, now seen corresponding path program 1 times
[2019-12-07 12:54:20,626 INFO  L163   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2019-12-07 12:54:20,626 INFO  L348   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903222947]
[2019-12-07 12:54:20,626 INFO  L94    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2019-12-07 12:54:20,641 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2019-12-07 12:54:20,679 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2019-12-07 12:54:20,679 INFO  L348   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903222947]
[2019-12-07 12:54:20,680 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2019-12-07 12:54:20,680 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2019-12-07 12:54:20,680 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109591329]
[2019-12-07 12:54:20,681 INFO  L442      AbstractCegarLoop]: Interpolant automaton has 4 states
[2019-12-07 12:54:20,681 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2019-12-07 12:54:20,681 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2019-12-07 12:54:20,681 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2019-12-07 12:54:20,682 INFO  L87              Difference]: Start difference. First operand 17 states and 20 transitions. Second operand 4 states.
[2019-12-07 12:54:20,704 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2019-12-07 12:54:20,704 INFO  L93              Difference]: Finished difference Result 28 states and 32 transitions.
[2019-12-07 12:54:20,705 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2019-12-07 12:54:20,705 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 14
[2019-12-07 12:54:20,705 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2019-12-07 12:54:20,705 INFO  L225             Difference]: With dead ends: 28
[2019-12-07 12:54:20,705 INFO  L226             Difference]: Without dead ends: 20
[2019-12-07 12:54:20,706 INFO  L630         BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12
[2019-12-07 12:54:20,706 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 20 states.
[2019-12-07 12:54:20,709 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18.
[2019-12-07 12:54:20,709 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 18 states.
[2019-12-07 12:54:20,709 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 21 transitions.
[2019-12-07 12:54:20,709 INFO  L78                 Accepts]: Start accepts. Automaton has 18 states and 21 transitions. Word has length 14
[2019-12-07 12:54:20,710 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2019-12-07 12:54:20,710 INFO  L462      AbstractCegarLoop]: Abstraction has 18 states and 21 transitions.
[2019-12-07 12:54:20,710 INFO  L463      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2019-12-07 12:54:20,710 INFO  L276                IsEmpty]: Start isEmpty. Operand 18 states and 21 transitions.
[2019-12-07 12:54:20,710 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 18
[2019-12-07 12:54:20,710 INFO  L402         BasicCegarLoop]: Found error trace
[2019-12-07 12:54:20,710 INFO  L410         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2019-12-07 12:54:20,711 INFO  L410      AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2019-12-07 12:54:20,711 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2019-12-07 12:54:20,711 INFO  L82        PathProgramCache]: Analyzing trace with hash 1149244957, now seen corresponding path program 1 times
[2019-12-07 12:54:20,711 INFO  L163   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2019-12-07 12:54:20,711 INFO  L348   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [34303049]
[2019-12-07 12:54:20,711 INFO  L94    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2019-12-07 12:54:20,722 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2019-12-07 12:54:20,757 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2019-12-07 12:54:20,757 INFO  L348   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [34303049]
[2019-12-07 12:54:20,757 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2019-12-07 12:54:20,757 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6
[2019-12-07 12:54:20,757 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006979778]
[2019-12-07 12:54:20,758 INFO  L442      AbstractCegarLoop]: Interpolant automaton has 6 states
[2019-12-07 12:54:20,758 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2019-12-07 12:54:20,758 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2019-12-07 12:54:20,758 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30
[2019-12-07 12:54:20,758 INFO  L87              Difference]: Start difference. First operand 18 states and 21 transitions. Second operand 6 states.
[2019-12-07 12:54:20,802 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2019-12-07 12:54:20,802 INFO  L93              Difference]: Finished difference Result 26 states and 29 transitions.
[2019-12-07 12:54:20,802 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. 
[2019-12-07 12:54:20,802 INFO  L78                 Accepts]: Start accepts. Automaton has 6 states. Word has length 17
[2019-12-07 12:54:20,803 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2019-12-07 12:54:20,803 INFO  L225             Difference]: With dead ends: 26
[2019-12-07 12:54:20,803 INFO  L226             Difference]: Without dead ends: 21
[2019-12-07 12:54:20,803 INFO  L630         BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72
[2019-12-07 12:54:20,804 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 21 states.
[2019-12-07 12:54:20,806 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19.
[2019-12-07 12:54:20,806 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 19 states.
[2019-12-07 12:54:20,807 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions.
[2019-12-07 12:54:20,807 INFO  L78                 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 17
[2019-12-07 12:54:20,807 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2019-12-07 12:54:20,807 INFO  L462      AbstractCegarLoop]: Abstraction has 19 states and 22 transitions.
[2019-12-07 12:54:20,807 INFO  L463      AbstractCegarLoop]: Interpolant automaton has 6 states.
[2019-12-07 12:54:20,807 INFO  L276                IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions.
[2019-12-07 12:54:20,808 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 19
[2019-12-07 12:54:20,808 INFO  L402         BasicCegarLoop]: Found error trace
[2019-12-07 12:54:20,808 INFO  L410         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2019-12-07 12:54:20,808 INFO  L410      AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2019-12-07 12:54:20,808 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2019-12-07 12:54:20,808 INFO  L82        PathProgramCache]: Analyzing trace with hash 1318509563, now seen corresponding path program 1 times
[2019-12-07 12:54:20,808 INFO  L163   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2019-12-07 12:54:20,809 INFO  L348   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [585096576]
[2019-12-07 12:54:20,809 INFO  L94    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2019-12-07 12:54:20,821 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2019-12-07 12:54:20,849 INFO  L134       CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2019-12-07 12:54:20,849 INFO  L348   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [585096576]
[2019-12-07 12:54:20,849 INFO  L348   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778093131]
[2019-12-07 12:54:20,849 INFO  L94    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d9c1b617-a12a-440b-bf2d-55a636fec65a/bin/uautomizer/z3
Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2019-12-07 12:54:20,887 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2019-12-07 12:54:20,889 INFO  L264         TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 5 conjunts are in the unsatisfiable core
[2019-12-07 12:54:20,892 INFO  L287         TraceCheckSpWp]: Computing forward predicates...
[2019-12-07 12:54:20,909 INFO  L134       CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2019-12-07 12:54:20,910 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2019-12-07 12:54:20,910 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6
[2019-12-07 12:54:20,910 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231064082]
[2019-12-07 12:54:20,910 INFO  L442      AbstractCegarLoop]: Interpolant automaton has 6 states
[2019-12-07 12:54:20,910 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2019-12-07 12:54:20,910 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2019-12-07 12:54:20,911 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30
[2019-12-07 12:54:20,911 INFO  L87              Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 6 states.
[2019-12-07 12:54:20,939 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2019-12-07 12:54:20,939 INFO  L93              Difference]: Finished difference Result 33 states and 37 transitions.
[2019-12-07 12:54:20,939 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2019-12-07 12:54:20,939 INFO  L78                 Accepts]: Start accepts. Automaton has 6 states. Word has length 18
[2019-12-07 12:54:20,939 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2019-12-07 12:54:20,940 INFO  L225             Difference]: With dead ends: 33
[2019-12-07 12:54:20,940 INFO  L226             Difference]: Without dead ends: 24
[2019-12-07 12:54:20,940 INFO  L630         BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42
[2019-12-07 12:54:20,940 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 24 states.
[2019-12-07 12:54:20,943 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22.
[2019-12-07 12:54:20,943 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 22 states.
[2019-12-07 12:54:20,943 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions.
[2019-12-07 12:54:20,943 INFO  L78                 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 18
[2019-12-07 12:54:20,944 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2019-12-07 12:54:20,944 INFO  L462      AbstractCegarLoop]: Abstraction has 22 states and 25 transitions.
[2019-12-07 12:54:20,944 INFO  L463      AbstractCegarLoop]: Interpolant automaton has 6 states.
[2019-12-07 12:54:20,944 INFO  L276                IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions.
[2019-12-07 12:54:20,944 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 22
[2019-12-07 12:54:20,944 INFO  L402         BasicCegarLoop]: Found error trace
[2019-12-07 12:54:20,944 INFO  L410         BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2019-12-07 12:54:21,145 WARN  L499      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2019-12-07 12:54:21,146 INFO  L410      AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2019-12-07 12:54:21,146 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2019-12-07 12:54:21,146 INFO  L82        PathProgramCache]: Analyzing trace with hash -2117322972, now seen corresponding path program 2 times
[2019-12-07 12:54:21,147 INFO  L163   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2019-12-07 12:54:21,147 INFO  L348   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [830988838]
[2019-12-07 12:54:21,148 INFO  L94    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2019-12-07 12:54:21,194 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2019-12-07 12:54:21,281 INFO  L134       CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2019-12-07 12:54:21,281 INFO  L348   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [830988838]
[2019-12-07 12:54:21,281 INFO  L348   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [53899200]
[2019-12-07 12:54:21,282 INFO  L92    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1
No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d9c1b617-a12a-440b-bf2d-55a636fec65a/bin/uautomizer/z3
Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2019-12-07 12:54:21,321 INFO  L249   tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s)
[2019-12-07 12:54:21,321 INFO  L250   tOrderPrioritization]: Conjunction of SSA is unsat
[2019-12-07 12:54:21,322 INFO  L264         TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core
[2019-12-07 12:54:21,324 INFO  L287         TraceCheckSpWp]: Computing forward predicates...
[2019-12-07 12:54:21,362 INFO  L134       CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2019-12-07 12:54:21,362 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2019-12-07 12:54:21,363 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 12
[2019-12-07 12:54:21,363 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504264975]
[2019-12-07 12:54:21,363 INFO  L442      AbstractCegarLoop]: Interpolant automaton has 12 states
[2019-12-07 12:54:21,363 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2019-12-07 12:54:21,363 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2019-12-07 12:54:21,364 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132
[2019-12-07 12:54:21,364 INFO  L87              Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 12 states.
[2019-12-07 12:54:21,537 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2019-12-07 12:54:21,537 INFO  L93              Difference]: Finished difference Result 35 states and 40 transitions.
[2019-12-07 12:54:21,537 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. 
[2019-12-07 12:54:21,537 INFO  L78                 Accepts]: Start accepts. Automaton has 12 states. Word has length 21
[2019-12-07 12:54:21,537 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2019-12-07 12:54:21,538 INFO  L225             Difference]: With dead ends: 35
[2019-12-07 12:54:21,538 INFO  L226             Difference]: Without dead ends: 26
[2019-12-07 12:54:21,539 INFO  L630         BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=87, Invalid=293, Unknown=0, NotChecked=0, Total=380
[2019-12-07 12:54:21,539 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 26 states.
[2019-12-07 12:54:21,542 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26.
[2019-12-07 12:54:21,542 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 26 states.
[2019-12-07 12:54:21,542 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions.
[2019-12-07 12:54:21,543 INFO  L78                 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 21
[2019-12-07 12:54:21,543 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2019-12-07 12:54:21,543 INFO  L462      AbstractCegarLoop]: Abstraction has 26 states and 29 transitions.
[2019-12-07 12:54:21,543 INFO  L463      AbstractCegarLoop]: Interpolant automaton has 12 states.
[2019-12-07 12:54:21,543 INFO  L276                IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions.
[2019-12-07 12:54:21,544 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 26
[2019-12-07 12:54:21,544 INFO  L402         BasicCegarLoop]: Found error trace
[2019-12-07 12:54:21,544 INFO  L410         BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2019-12-07 12:54:21,745 WARN  L499      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2019-12-07 12:54:21,746 INFO  L410      AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2019-12-07 12:54:21,746 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2019-12-07 12:54:21,747 INFO  L82        PathProgramCache]: Analyzing trace with hash 1344305789, now seen corresponding path program 3 times
[2019-12-07 12:54:21,747 INFO  L163   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2019-12-07 12:54:21,748 INFO  L348   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [710895051]
[2019-12-07 12:54:21,749 INFO  L94    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2019-12-07 12:54:21,807 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2019-12-07 12:54:21,970 INFO  L134       CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2019-12-07 12:54:21,971 INFO  L348   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [710895051]
[2019-12-07 12:54:21,971 INFO  L348   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1124338489]
[2019-12-07 12:54:21,971 INFO  L92    rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2
No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d9c1b617-a12a-440b-bf2d-55a636fec65a/bin/uautomizer/z3
Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2019-12-07 12:54:22,011 INFO  L249   tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s)
[2019-12-07 12:54:22,011 INFO  L250   tOrderPrioritization]: Conjunction of SSA is unsat
[2019-12-07 12:54:22,012 INFO  L264         TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 13 conjunts are in the unsatisfiable core
[2019-12-07 12:54:22,014 INFO  L287         TraceCheckSpWp]: Computing forward predicates...
[2019-12-07 12:54:22,105 INFO  L134       CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked.
[2019-12-07 12:54:22,106 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2019-12-07 12:54:22,106 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 8] total 18
[2019-12-07 12:54:22,106 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608157355]
[2019-12-07 12:54:22,107 INFO  L442      AbstractCegarLoop]: Interpolant automaton has 18 states
[2019-12-07 12:54:22,107 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL
[2019-12-07 12:54:22,107 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants.
[2019-12-07 12:54:22,107 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=267, Unknown=0, NotChecked=0, Total=306
[2019-12-07 12:54:22,107 INFO  L87              Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 18 states.
[2019-12-07 12:54:22,779 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2019-12-07 12:54:22,779 INFO  L93              Difference]: Finished difference Result 61 states and 68 transitions.
[2019-12-07 12:54:22,780 INFO  L142   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. 
[2019-12-07 12:54:22,780 INFO  L78                 Accepts]: Start accepts. Automaton has 18 states. Word has length 25
[2019-12-07 12:54:22,780 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2019-12-07 12:54:22,781 INFO  L225             Difference]: With dead ends: 61
[2019-12-07 12:54:22,781 INFO  L226             Difference]: Without dead ends: 56
[2019-12-07 12:54:22,782 INFO  L630         BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=270, Invalid=920, Unknown=0, NotChecked=0, Total=1190
[2019-12-07 12:54:22,782 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 56 states.
[2019-12-07 12:54:22,786 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 27.
[2019-12-07 12:54:22,786 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 27 states.
[2019-12-07 12:54:22,787 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions.
[2019-12-07 12:54:22,787 INFO  L78                 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 25
[2019-12-07 12:54:22,787 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2019-12-07 12:54:22,787 INFO  L462      AbstractCegarLoop]: Abstraction has 27 states and 30 transitions.
[2019-12-07 12:54:22,788 INFO  L463      AbstractCegarLoop]: Interpolant automaton has 18 states.
[2019-12-07 12:54:22,788 INFO  L276                IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions.
[2019-12-07 12:54:22,788 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 27
[2019-12-07 12:54:22,788 INFO  L402         BasicCegarLoop]: Found error trace
[2019-12-07 12:54:22,788 INFO  L410         BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2019-12-07 12:54:22,989 WARN  L499      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true
[2019-12-07 12:54:22,990 INFO  L410      AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2019-12-07 12:54:22,990 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2019-12-07 12:54:22,991 INFO  L82        PathProgramCache]: Analyzing trace with hash -1224539237, now seen corresponding path program 4 times
[2019-12-07 12:54:22,991 INFO  L163   FreeRefinementEngine]: Executing refinement strategy CAMEL
[2019-12-07 12:54:22,992 INFO  L348   FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1712167238]
[2019-12-07 12:54:22,992 INFO  L94    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2019-12-07 12:54:23,039 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2019-12-07 12:54:23,054 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2019-12-07 12:54:23,071 INFO  L174   FreeRefinementEngine]: Strategy CAMEL found a feasible trace
[2019-12-07 12:54:23,071 INFO  L475         BasicCegarLoop]: Counterexample might be feasible
[2019-12-07 12:54:23,095 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.12 12:54:23 BoogieIcfgContainer
[2019-12-07 12:54:23,096 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2019-12-07 12:54:23,096 INFO  L113        PluginConnector]: ------------------------Witness Printer----------------------------
[2019-12-07 12:54:23,096 INFO  L271        PluginConnector]: Initializing Witness Printer...
[2019-12-07 12:54:23,096 INFO  L275        PluginConnector]: Witness Printer initialized
[2019-12-07 12:54:23,096 INFO  L185        PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.12 12:54:20" (3/4) ...
[2019-12-07 12:54:23,098 INFO  L131         WitnessPrinter]: Generating witness for reachability counterexample
[2019-12-07 12:54:23,138 INFO  L141         WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_d9c1b617-a12a-440b-bf2d-55a636fec65a/bin/uautomizer/witness.graphml
[2019-12-07 12:54:23,139 INFO  L132        PluginConnector]: ------------------------ END Witness Printer----------------------------
[2019-12-07 12:54:23,140 INFO  L168              Benchmark]: Toolchain (without parser) took 3287.79 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 213.4 MB). Free memory was 940.9 MB in the beginning and 1.1 GB in the end (delta: -190.7 MB). Peak memory consumption was 22.7 MB. Max. memory is 11.5 GB.
[2019-12-07 12:54:23,140 INFO  L168              Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 961.3 MB. There was no memory consumed. Max. memory is 11.5 GB.
[2019-12-07 12:54:23,141 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 325.98 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 141.0 MB). Free memory was 940.9 MB in the beginning and 1.1 GB in the end (delta: -170.9 MB). Peak memory consumption was 18.0 MB. Max. memory is 11.5 GB.
[2019-12-07 12:54:23,141 INFO  L168              Benchmark]: Boogie Procedure Inliner took 32.42 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB.
[2019-12-07 12:54:23,141 INFO  L168              Benchmark]: Boogie Preprocessor took 20.39 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB.
[2019-12-07 12:54:23,142 INFO  L168              Benchmark]: RCFGBuilder took 200.88 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 29.6 MB). Peak memory consumption was 29.6 MB. Max. memory is 11.5 GB.
[2019-12-07 12:54:23,142 INFO  L168              Benchmark]: TraceAbstraction took 2662.30 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 72.4 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: -52.1 MB). Peak memory consumption was 20.3 MB. Max. memory is 11.5 GB.
[2019-12-07 12:54:23,142 INFO  L168              Benchmark]: Witness Printer took 42.88 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB.
[2019-12-07 12:54:23,144 INFO  L335   ainManager$Toolchain]: #######################  End [Toolchain 1] #######################
 --- Results ---
 * Results from de.uni_freiburg.informatik.ultimate.core:
  - StatisticsResult: Toolchain Benchmarks
    Benchmark results are:
 * CDTParser took 0.17 ms. Allocated memory is still 1.0 GB. Free memory is still 961.3 MB. There was no memory consumed. Max. memory is 11.5 GB.
 * CACSL2BoogieTranslator took 325.98 ms. Allocated memory was 1.0 GB in the beginning and 1.2 GB in the end (delta: 141.0 MB). Free memory was 940.9 MB in the beginning and 1.1 GB in the end (delta: -170.9 MB). Peak memory consumption was 18.0 MB. Max. memory is 11.5 GB.
 * Boogie Procedure Inliner took 32.42 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB.
 * Boogie Preprocessor took 20.39 ms. Allocated memory is still 1.2 GB. Free memory is still 1.1 GB. There was no memory consumed. Max. memory is 11.5 GB.
 * RCFGBuilder took 200.88 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 29.6 MB). Peak memory consumption was 29.6 MB. Max. memory is 11.5 GB.
 * TraceAbstraction took 2662.30 ms. Allocated memory was 1.2 GB in the beginning and 1.2 GB in the end (delta: 72.4 MB). Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: -52.1 MB). Peak memory consumption was 20.3 MB. Max. memory is 11.5 GB.
 * Witness Printer took 42.88 ms. Allocated memory is still 1.2 GB. Free memory was 1.1 GB in the beginning and 1.1 GB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 11.5 GB.
 * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction:
  - CounterExampleResult [Line: 602]: a call of __VERIFIER_error() is reachable
    a call of __VERIFIER_error() is reachable
We found a FailurePath: 
[L592]              int len = 2;
[L593]              len < 32 && __VERIFIER_nondet_int()
[L593]              len < 32 && __VERIFIER_nondet_int()
[L593]  COND FALSE  !(len < 32 && __VERIFIER_nondet_int())
[L564]              SLL head = ((void *)0);
[L565]  COND TRUE   len > 0
[L566]              SLL new_head = (SLL) malloc(sizeof(struct node));
[L567]  COND FALSE  !(((void *)0) == new_head)
[L570]              new_head->next = head
[L571]              head = new_head
[L572]              len--
[L565]  COND TRUE   len > 0
[L566]              SLL new_head = (SLL) malloc(sizeof(struct node));
[L567]  COND FALSE  !(((void *)0) == new_head)
[L570]              new_head->next = head
[L571]              head = new_head
[L572]              len--
[L565]  COND TRUE   len > 0
[L566]              SLL new_head = (SLL) malloc(sizeof(struct node));
[L567]  COND FALSE  !(((void *)0) == new_head)
[L570]              new_head->next = head
[L571]              head = new_head
[L572]              len--
[L565]  COND FALSE  !(len > 0)
[L574]              return head;
[L596]              SLL s = sll_create(len + 1);
[L577]              int len = 0;
[L578]  COND TRUE   \read(head)
[L579]              len++
[L580]  EXPR        head->next
[L580]              head = head->next
[L578]  COND TRUE   \read(head)
[L579]              len++
[L580]  EXPR        head->next
[L580]              head = head->next
[L578]  COND TRUE   \read(head)
[L579]              len++
[L580]  EXPR        head->next
[L580]              head = head->next
[L578]  COND FALSE  !(\read(head))
[L582]              return len;
[L597]  COND TRUE   len != sll_length(s)
[L602]              __VERIFIER_error()

  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 1 procedures, 23 locations, 1 error locations. Result: UNSAFE, OverallTime: 2.6s, OverallIterations: 7, TraceHistogramMax: 3, AutomataDifference: 0.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 94 SDtfs, 258 SDslu, 250 SDs, 0 SdLazy, 396 SolverSat, 87 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 127 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=27occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 35 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 197 NumberOfCodeBlocks, 191 NumberOfCodeBlocksAsserted, 12 NumberOfCheckSat, 162 ConstructedInterpolants, 0 QuantifiedInterpolants, 10774 SizeOfPredicates, 8 NumberOfNonLiveVariables, 281 ConjunctsInSsa, 24 ConjunctsInUnsatCore, 9 InterpolantComputations, 3 PerfectInterpolantSequences, 21/47 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: No data available, ReuseStatistics: No data available
RESULT: Ultimate proved your program to be incorrect!
Received shutdown request...