/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/list-ext3-properties/sll_length_check-1.i


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


This is Ultimate 0.1.25-5644d1e-m
[2020-08-18 16:18:28,759 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-18 16:18:28,762 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-18 16:18:28,787 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-18 16:18:28,787 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-18 16:18:28,788 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-18 16:18:28,789 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-18 16:18:28,791 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-18 16:18:28,793 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-18 16:18:28,794 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-18 16:18:28,795 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-18 16:18:28,796 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-18 16:18:28,796 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-18 16:18:28,797 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-18 16:18:28,798 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-18 16:18:28,799 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-18 16:18:28,800 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-18 16:18:28,801 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-18 16:18:28,803 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-18 16:18:28,804 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-18 16:18:28,806 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-18 16:18:28,807 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-18 16:18:28,808 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-18 16:18:28,809 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-18 16:18:28,812 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-18 16:18:28,813 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-18 16:18:28,813 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-18 16:18:28,817 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-18 16:18:28,820 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-18 16:18:28,821 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-18 16:18:28,821 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-18 16:18:28,822 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-18 16:18:28,822 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-18 16:18:28,825 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-18 16:18:28,826 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-18 16:18:28,826 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-18 16:18:28,827 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-18 16:18:28,827 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-18 16:18:28,828 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-08-18 16:18:28,828 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-08-18 16:18:28,829 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-18 16:18:28,830 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-08-18 16:18:28,878 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-18 16:18:28,879 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-18 16:18:28,885 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-18 16:18:28,885 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-18 16:18:28,885 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-18 16:18:28,885 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-18 16:18:28,886 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-18 16:18:28,888 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-18 16:18:28,888 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-18 16:18:28,888 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-18 16:18:28,888 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-18 16:18:28,888 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-18 16:18:28,889 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-18 16:18:28,889 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-18 16:18:28,889 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-18 16:18:28,889 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-18 16:18:28,889 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-18 16:18:28,890 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-18 16:18:28,893 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-18 16:18:28,893 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-18 16:18:28,893 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-18 16:18:28,893 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 16:18:28,894 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-18 16:18:28,894 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-18 16:18:28,894 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-18 16:18:28,894 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-18 16:18:28,894 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-18 16:18:28,895 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-18 16:18:28,895 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-18 16:18:28,896 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true
[2020-08-18 16:18:29,247 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-18 16:18:29,260 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-18 16:18:29,264 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-18 16:18:29,265 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-18 16:18:29,266 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-18 16:18:29,267 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-ext3-properties/sll_length_check-1.i
[2020-08-18 16:18:29,328 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b4c8ff203/208ee63c31e94f7a959400d5b44ed85b/FLAGab5e174c4
[2020-08-18 16:18:29,862 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-18 16:18:29,863 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/list-ext3-properties/sll_length_check-1.i
[2020-08-18 16:18:29,887 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b4c8ff203/208ee63c31e94f7a959400d5b44ed85b/FLAGab5e174c4
[2020-08-18 16:18:30,088 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b4c8ff203/208ee63c31e94f7a959400d5b44ed85b
[2020-08-18 16:18:30,096 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-18 16:18:30,098 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-18 16:18:30,099 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-18 16:18:30,099 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-18 16:18:30,102 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-18 16:18:30,103 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:18:30" (1/1) ...
[2020-08-18 16:18:30,106 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@585b843f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:18:30, skipping insertion in model container
[2020-08-18 16:18:30,106 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 04:18:30" (1/1) ...
[2020-08-18 16:18:30,114 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-18 16:18:30,153 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-18 16:18:30,757 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 16:18:30,770 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-18 16:18:30,846 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 16:18:30,914 INFO  L208         MainTranslator]: Completed translation
[2020-08-18 16:18:30,916 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:18:30 WrapperNode
[2020-08-18 16:18:30,916 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-18 16:18:30,917 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-18 16:18:30,917 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-18 16:18:30,918 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-18 16:18:30,929 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:18:30" (1/1) ...
[2020-08-18 16:18:30,929 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:18:30" (1/1) ...
[2020-08-18 16:18:30,945 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:18:30" (1/1) ...
[2020-08-18 16:18:30,945 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:18:30" (1/1) ...
[2020-08-18 16:18:30,961 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:18:30" (1/1) ...
[2020-08-18 16:18:30,967 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:18:30" (1/1) ...
[2020-08-18 16:18:30,970 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:18:30" (1/1) ...
[2020-08-18 16:18:30,976 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-18 16:18:30,977 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-18 16:18:30,977 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-18 16:18:30,977 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-18 16:18:30,978 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:18:30" (1/1) ...
No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/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
[2020-08-18 16:18:31,051 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-18 16:18:31,051 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-18 16:18:31,051 INFO  L138     BoogieDeclarations]: Found implementation of procedure __bswap_32
[2020-08-18 16:18:31,051 INFO  L138     BoogieDeclarations]: Found implementation of procedure __bswap_64
[2020-08-18 16:18:31,053 INFO  L138     BoogieDeclarations]: Found implementation of procedure myexit
[2020-08-18 16:18:31,053 INFO  L138     BoogieDeclarations]: Found implementation of procedure sll_create
[2020-08-18 16:18:31,053 INFO  L138     BoogieDeclarations]: Found implementation of procedure sll_length
[2020-08-18 16:18:31,054 INFO  L138     BoogieDeclarations]: Found implementation of procedure sll_destroy
[2020-08-18 16:18:31,054 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-18 16:18:31,054 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-18 16:18:31,054 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-08-18 16:18:31,055 INFO  L130     BoogieDeclarations]: Found specification of procedure __bswap_32
[2020-08-18 16:18:31,056 INFO  L130     BoogieDeclarations]: Found specification of procedure __bswap_64
[2020-08-18 16:18:31,056 INFO  L130     BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max
[2020-08-18 16:18:31,056 INFO  L130     BoogieDeclarations]: Found specification of procedure atof
[2020-08-18 16:18:31,057 INFO  L130     BoogieDeclarations]: Found specification of procedure atoi
[2020-08-18 16:18:31,057 INFO  L130     BoogieDeclarations]: Found specification of procedure atol
[2020-08-18 16:18:31,057 INFO  L130     BoogieDeclarations]: Found specification of procedure atoll
[2020-08-18 16:18:31,057 INFO  L130     BoogieDeclarations]: Found specification of procedure strtod
[2020-08-18 16:18:31,058 INFO  L130     BoogieDeclarations]: Found specification of procedure strtof
[2020-08-18 16:18:31,058 INFO  L130     BoogieDeclarations]: Found specification of procedure strtold
[2020-08-18 16:18:31,059 INFO  L130     BoogieDeclarations]: Found specification of procedure strtol
[2020-08-18 16:18:31,059 INFO  L130     BoogieDeclarations]: Found specification of procedure strtoul
[2020-08-18 16:18:31,059 INFO  L130     BoogieDeclarations]: Found specification of procedure strtoq
[2020-08-18 16:18:31,060 INFO  L130     BoogieDeclarations]: Found specification of procedure strtouq
[2020-08-18 16:18:31,061 INFO  L130     BoogieDeclarations]: Found specification of procedure strtoll
[2020-08-18 16:18:31,061 INFO  L130     BoogieDeclarations]: Found specification of procedure strtoull
[2020-08-18 16:18:31,061 INFO  L130     BoogieDeclarations]: Found specification of procedure l64a
[2020-08-18 16:18:31,062 INFO  L130     BoogieDeclarations]: Found specification of procedure a64l
[2020-08-18 16:18:31,062 INFO  L130     BoogieDeclarations]: Found specification of procedure select
[2020-08-18 16:18:31,062 INFO  L130     BoogieDeclarations]: Found specification of procedure pselect
[2020-08-18 16:18:31,062 INFO  L130     BoogieDeclarations]: Found specification of procedure gnu_dev_major
[2020-08-18 16:18:31,062 INFO  L130     BoogieDeclarations]: Found specification of procedure gnu_dev_minor
[2020-08-18 16:18:31,063 INFO  L130     BoogieDeclarations]: Found specification of procedure gnu_dev_makedev
[2020-08-18 16:18:31,063 INFO  L130     BoogieDeclarations]: Found specification of procedure random
[2020-08-18 16:18:31,063 INFO  L130     BoogieDeclarations]: Found specification of procedure srandom
[2020-08-18 16:18:31,063 INFO  L130     BoogieDeclarations]: Found specification of procedure initstate
[2020-08-18 16:18:31,064 INFO  L130     BoogieDeclarations]: Found specification of procedure setstate
[2020-08-18 16:18:31,064 INFO  L130     BoogieDeclarations]: Found specification of procedure random_r
[2020-08-18 16:18:31,064 INFO  L130     BoogieDeclarations]: Found specification of procedure srandom_r
[2020-08-18 16:18:31,064 INFO  L130     BoogieDeclarations]: Found specification of procedure initstate_r
[2020-08-18 16:18:31,064 INFO  L130     BoogieDeclarations]: Found specification of procedure setstate_r
[2020-08-18 16:18:31,064 INFO  L130     BoogieDeclarations]: Found specification of procedure rand
[2020-08-18 16:18:31,064 INFO  L130     BoogieDeclarations]: Found specification of procedure srand
[2020-08-18 16:18:31,065 INFO  L130     BoogieDeclarations]: Found specification of procedure rand_r
[2020-08-18 16:18:31,065 INFO  L130     BoogieDeclarations]: Found specification of procedure drand48
[2020-08-18 16:18:31,065 INFO  L130     BoogieDeclarations]: Found specification of procedure erand48
[2020-08-18 16:18:31,065 INFO  L130     BoogieDeclarations]: Found specification of procedure lrand48
[2020-08-18 16:18:31,065 INFO  L130     BoogieDeclarations]: Found specification of procedure nrand48
[2020-08-18 16:18:31,065 INFO  L130     BoogieDeclarations]: Found specification of procedure mrand48
[2020-08-18 16:18:31,065 INFO  L130     BoogieDeclarations]: Found specification of procedure jrand48
[2020-08-18 16:18:31,066 INFO  L130     BoogieDeclarations]: Found specification of procedure srand48
[2020-08-18 16:18:31,066 INFO  L130     BoogieDeclarations]: Found specification of procedure seed48
[2020-08-18 16:18:31,066 INFO  L130     BoogieDeclarations]: Found specification of procedure lcong48
[2020-08-18 16:18:31,066 INFO  L130     BoogieDeclarations]: Found specification of procedure drand48_r
[2020-08-18 16:18:31,066 INFO  L130     BoogieDeclarations]: Found specification of procedure erand48_r
[2020-08-18 16:18:31,066 INFO  L130     BoogieDeclarations]: Found specification of procedure lrand48_r
[2020-08-18 16:18:31,066 INFO  L130     BoogieDeclarations]: Found specification of procedure nrand48_r
[2020-08-18 16:18:31,067 INFO  L130     BoogieDeclarations]: Found specification of procedure mrand48_r
[2020-08-18 16:18:31,068 INFO  L130     BoogieDeclarations]: Found specification of procedure jrand48_r
[2020-08-18 16:18:31,068 INFO  L130     BoogieDeclarations]: Found specification of procedure srand48_r
[2020-08-18 16:18:31,068 INFO  L130     BoogieDeclarations]: Found specification of procedure seed48_r
[2020-08-18 16:18:31,068 INFO  L130     BoogieDeclarations]: Found specification of procedure lcong48_r
[2020-08-18 16:18:31,069 INFO  L130     BoogieDeclarations]: Found specification of procedure malloc
[2020-08-18 16:18:31,069 INFO  L130     BoogieDeclarations]: Found specification of procedure calloc
[2020-08-18 16:18:31,069 INFO  L130     BoogieDeclarations]: Found specification of procedure realloc
[2020-08-18 16:18:31,069 INFO  L130     BoogieDeclarations]: Found specification of procedure free
[2020-08-18 16:18:31,070 INFO  L130     BoogieDeclarations]: Found specification of procedure cfree
[2020-08-18 16:18:31,070 INFO  L130     BoogieDeclarations]: Found specification of procedure alloca
[2020-08-18 16:18:31,070 INFO  L130     BoogieDeclarations]: Found specification of procedure valloc
[2020-08-18 16:18:31,070 INFO  L130     BoogieDeclarations]: Found specification of procedure posix_memalign
[2020-08-18 16:18:31,070 INFO  L130     BoogieDeclarations]: Found specification of procedure aligned_alloc
[2020-08-18 16:18:31,071 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-18 16:18:31,071 INFO  L130     BoogieDeclarations]: Found specification of procedure atexit
[2020-08-18 16:18:31,071 INFO  L130     BoogieDeclarations]: Found specification of procedure at_quick_exit
[2020-08-18 16:18:31,072 INFO  L130     BoogieDeclarations]: Found specification of procedure on_exit
[2020-08-18 16:18:31,072 INFO  L130     BoogieDeclarations]: Found specification of procedure exit
[2020-08-18 16:18:31,072 INFO  L130     BoogieDeclarations]: Found specification of procedure quick_exit
[2020-08-18 16:18:31,073 INFO  L130     BoogieDeclarations]: Found specification of procedure _Exit
[2020-08-18 16:18:31,073 INFO  L130     BoogieDeclarations]: Found specification of procedure getenv
[2020-08-18 16:18:31,073 INFO  L130     BoogieDeclarations]: Found specification of procedure putenv
[2020-08-18 16:18:31,074 INFO  L130     BoogieDeclarations]: Found specification of procedure setenv
[2020-08-18 16:18:31,074 INFO  L130     BoogieDeclarations]: Found specification of procedure unsetenv
[2020-08-18 16:18:31,074 INFO  L130     BoogieDeclarations]: Found specification of procedure clearenv
[2020-08-18 16:18:31,074 INFO  L130     BoogieDeclarations]: Found specification of procedure mktemp
[2020-08-18 16:18:31,074 INFO  L130     BoogieDeclarations]: Found specification of procedure mkstemp
[2020-08-18 16:18:31,074 INFO  L130     BoogieDeclarations]: Found specification of procedure mkstemps
[2020-08-18 16:18:31,075 INFO  L130     BoogieDeclarations]: Found specification of procedure mkdtemp
[2020-08-18 16:18:31,075 INFO  L130     BoogieDeclarations]: Found specification of procedure system
[2020-08-18 16:18:31,076 INFO  L130     BoogieDeclarations]: Found specification of procedure realpath
[2020-08-18 16:18:31,076 INFO  L130     BoogieDeclarations]: Found specification of procedure bsearch
[2020-08-18 16:18:31,076 INFO  L130     BoogieDeclarations]: Found specification of procedure qsort
[2020-08-18 16:18:31,076 INFO  L130     BoogieDeclarations]: Found specification of procedure abs
[2020-08-18 16:18:31,076 INFO  L130     BoogieDeclarations]: Found specification of procedure labs
[2020-08-18 16:18:31,076 INFO  L130     BoogieDeclarations]: Found specification of procedure llabs
[2020-08-18 16:18:31,076 INFO  L130     BoogieDeclarations]: Found specification of procedure div
[2020-08-18 16:18:31,077 INFO  L130     BoogieDeclarations]: Found specification of procedure ldiv
[2020-08-18 16:18:31,077 INFO  L130     BoogieDeclarations]: Found specification of procedure lldiv
[2020-08-18 16:18:31,077 INFO  L130     BoogieDeclarations]: Found specification of procedure ecvt
[2020-08-18 16:18:31,077 INFO  L130     BoogieDeclarations]: Found specification of procedure fcvt
[2020-08-18 16:18:31,077 INFO  L130     BoogieDeclarations]: Found specification of procedure gcvt
[2020-08-18 16:18:31,077 INFO  L130     BoogieDeclarations]: Found specification of procedure qecvt
[2020-08-18 16:18:31,077 INFO  L130     BoogieDeclarations]: Found specification of procedure qfcvt
[2020-08-18 16:18:31,078 INFO  L130     BoogieDeclarations]: Found specification of procedure qgcvt
[2020-08-18 16:18:31,078 INFO  L130     BoogieDeclarations]: Found specification of procedure ecvt_r
[2020-08-18 16:18:31,078 INFO  L130     BoogieDeclarations]: Found specification of procedure fcvt_r
[2020-08-18 16:18:31,078 INFO  L130     BoogieDeclarations]: Found specification of procedure qecvt_r
[2020-08-18 16:18:31,078 INFO  L130     BoogieDeclarations]: Found specification of procedure qfcvt_r
[2020-08-18 16:18:31,078 INFO  L130     BoogieDeclarations]: Found specification of procedure mblen
[2020-08-18 16:18:31,078 INFO  L130     BoogieDeclarations]: Found specification of procedure mbtowc
[2020-08-18 16:18:31,079 INFO  L130     BoogieDeclarations]: Found specification of procedure wctomb
[2020-08-18 16:18:31,079 INFO  L130     BoogieDeclarations]: Found specification of procedure mbstowcs
[2020-08-18 16:18:31,079 INFO  L130     BoogieDeclarations]: Found specification of procedure wcstombs
[2020-08-18 16:18:31,079 INFO  L130     BoogieDeclarations]: Found specification of procedure rpmatch
[2020-08-18 16:18:31,079 INFO  L130     BoogieDeclarations]: Found specification of procedure getsubopt
[2020-08-18 16:18:31,079 INFO  L130     BoogieDeclarations]: Found specification of procedure getloadavg
[2020-08-18 16:18:31,080 INFO  L130     BoogieDeclarations]: Found specification of procedure myexit
[2020-08-18 16:18:31,080 INFO  L130     BoogieDeclarations]: Found specification of procedure sll_create
[2020-08-18 16:18:31,081 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap
[2020-08-18 16:18:31,081 INFO  L130     BoogieDeclarations]: Found specification of procedure write~$Pointer$
[2020-08-18 16:18:31,081 INFO  L130     BoogieDeclarations]: Found specification of procedure sll_length
[2020-08-18 16:18:31,081 INFO  L130     BoogieDeclarations]: Found specification of procedure read~$Pointer$
[2020-08-18 16:18:31,081 INFO  L130     BoogieDeclarations]: Found specification of procedure sll_destroy
[2020-08-18 16:18:31,081 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc
[2020-08-18 16:18:31,082 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-18 16:18:31,082 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-18 16:18:31,082 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-18 16:18:31,427 INFO  L732   $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true;
[2020-08-18 16:18:31,573 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-18 16:18:31,573 INFO  L295             CfgBuilder]: Removed 4 assume(true) statements.
[2020-08-18 16:18:31,578 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:18:31 BoogieIcfgContainer
[2020-08-18 16:18:31,578 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-18 16:18:31,580 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-18 16:18:31,580 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-18 16:18:31,583 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-18 16:18:31,584 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 04:18:30" (1/3) ...
[2020-08-18 16:18:31,584 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@246da4be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:18:31, skipping insertion in model container
[2020-08-18 16:18:31,585 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 04:18:30" (2/3) ...
[2020-08-18 16:18:31,585 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@246da4be and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 04:18:31, skipping insertion in model container
[2020-08-18 16:18:31,585 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 04:18:31" (3/3) ...
[2020-08-18 16:18:31,587 INFO  L109   eAbstractionObserver]: Analyzing ICFG sll_length_check-1.i
[2020-08-18 16:18:31,599 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-18 16:18:31,607 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-18 16:18:31,623 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-18 16:18:31,651 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-18 16:18:31,652 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-18 16:18:31,652 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-18 16:18:31,652 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-18 16:18:31,652 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-18 16:18:31,653 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-18 16:18:31,653 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-18 16:18:31,653 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-18 16:18:31,673 INFO  L276                IsEmpty]: Start isEmpty. Operand 41 states.
[2020-08-18 16:18:31,681 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 24
[2020-08-18 16:18:31,681 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 16:18:31,682 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 16:18:31,683 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 16:18:31,689 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 16:18:31,690 INFO  L82        PathProgramCache]: Analyzing trace with hash -1666427650, now seen corresponding path program 1 times
[2020-08-18 16:18:31,699 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 16:18:31,699 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [423422366]
[2020-08-18 16:18:31,699 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 16:18:31,796 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:31,858 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 16:18:31,861 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:31,884 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7
[2020-08-18 16:18:31,889 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:31,896 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14
[2020-08-18 16:18:31,898 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:31,908 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 16:18:31,909 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [423422366]
[2020-08-18 16:18:31,912 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 16:18:31,913 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 16:18:31,914 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584149588]
[2020-08-18 16:18:31,919 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 16:18:31,920 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 16:18:31,939 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 16:18:31,940 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 16:18:31,942 INFO  L87              Difference]: Start difference. First operand 41 states. Second operand 4 states.
[2020-08-18 16:18:32,152 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 16:18:32,153 INFO  L93              Difference]: Finished difference Result 90 states and 120 transitions.
[2020-08-18 16:18:32,153 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. 
[2020-08-18 16:18:32,155 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 23
[2020-08-18 16:18:32,155 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 16:18:32,164 INFO  L225             Difference]: With dead ends: 90
[2020-08-18 16:18:32,164 INFO  L226             Difference]: Without dead ends: 38
[2020-08-18 16:18:32,168 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20
[2020-08-18 16:18:32,186 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 38 states.
[2020-08-18 16:18:32,210 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 28.
[2020-08-18 16:18:32,211 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 28 states.
[2020-08-18 16:18:32,212 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions.
[2020-08-18 16:18:32,214 INFO  L78                 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 23
[2020-08-18 16:18:32,215 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 16:18:32,215 INFO  L479      AbstractCegarLoop]: Abstraction has 28 states and 31 transitions.
[2020-08-18 16:18:32,215 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 16:18:32,215 INFO  L276                IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions.
[2020-08-18 16:18:32,216 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 26
[2020-08-18 16:18:32,216 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 16:18:32,216 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 16:18:32,217 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-18 16:18:32,217 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 16:18:32,217 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 16:18:32,217 INFO  L82        PathProgramCache]: Analyzing trace with hash -29727073, now seen corresponding path program 1 times
[2020-08-18 16:18:32,218 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 16:18:32,218 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [201411114]
[2020-08-18 16:18:32,218 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 16:18:32,250 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:32,315 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 16:18:32,318 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:32,341 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9
[2020-08-18 16:18:32,346 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:32,383 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16
[2020-08-18 16:18:32,386 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:32,392 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 16:18:32,392 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [201411114]
[2020-08-18 16:18:32,393 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 16:18:32,393 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7
[2020-08-18 16:18:32,393 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31654901]
[2020-08-18 16:18:32,395 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 7 states
[2020-08-18 16:18:32,395 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 16:18:32,395 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2020-08-18 16:18:32,396 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42
[2020-08-18 16:18:32,396 INFO  L87              Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 7 states.
[2020-08-18 16:18:32,591 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 16:18:32,591 INFO  L93              Difference]: Finished difference Result 45 states and 49 transitions.
[2020-08-18 16:18:32,592 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. 
[2020-08-18 16:18:32,592 INFO  L78                 Accepts]: Start accepts. Automaton has 7 states. Word has length 25
[2020-08-18 16:18:32,592 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 16:18:32,593 INFO  L225             Difference]: With dead ends: 45
[2020-08-18 16:18:32,593 INFO  L226             Difference]: Without dead ends: 31
[2020-08-18 16:18:32,595 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110
[2020-08-18 16:18:32,595 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 31 states.
[2020-08-18 16:18:32,601 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29.
[2020-08-18 16:18:32,601 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 29 states.
[2020-08-18 16:18:32,603 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions.
[2020-08-18 16:18:32,603 INFO  L78                 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 25
[2020-08-18 16:18:32,603 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 16:18:32,603 INFO  L479      AbstractCegarLoop]: Abstraction has 29 states and 32 transitions.
[2020-08-18 16:18:32,603 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 7 states.
[2020-08-18 16:18:32,604 INFO  L276                IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions.
[2020-08-18 16:18:32,604 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 29
[2020-08-18 16:18:32,605 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 16:18:32,605 INFO  L422         BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 16:18:32,605 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-18 16:18:32,606 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 16:18:32,606 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 16:18:32,606 INFO  L82        PathProgramCache]: Analyzing trace with hash -1680455870, now seen corresponding path program 1 times
[2020-08-18 16:18:32,606 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 16:18:32,607 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [271236519]
[2020-08-18 16:18:32,607 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 16:18:32,626 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:32,665 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 16:18:32,668 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:32,688 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9
[2020-08-18 16:18:32,704 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:32,781 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19
[2020-08-18 16:18:32,784 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:32,791 INFO  L134       CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 16:18:32,791 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [271236519]
[2020-08-18 16:18:32,792 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 16:18:32,792 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8
[2020-08-18 16:18:32,792 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975503741]
[2020-08-18 16:18:32,793 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 8 states
[2020-08-18 16:18:32,793 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 16:18:32,793 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants.
[2020-08-18 16:18:32,794 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56
[2020-08-18 16:18:32,794 INFO  L87              Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 8 states.
[2020-08-18 16:18:32,981 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 16:18:32,981 INFO  L93              Difference]: Finished difference Result 48 states and 52 transitions.
[2020-08-18 16:18:32,982 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. 
[2020-08-18 16:18:32,982 INFO  L78                 Accepts]: Start accepts. Automaton has 8 states. Word has length 28
[2020-08-18 16:18:32,983 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 16:18:32,983 INFO  L225             Difference]: With dead ends: 48
[2020-08-18 16:18:32,984 INFO  L226             Difference]: Without dead ends: 34
[2020-08-18 16:18:32,984 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132
[2020-08-18 16:18:32,985 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 34 states.
[2020-08-18 16:18:32,990 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32.
[2020-08-18 16:18:32,991 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 32 states.
[2020-08-18 16:18:32,991 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions.
[2020-08-18 16:18:32,992 INFO  L78                 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 28
[2020-08-18 16:18:32,992 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 16:18:32,992 INFO  L479      AbstractCegarLoop]: Abstraction has 32 states and 35 transitions.
[2020-08-18 16:18:32,992 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 8 states.
[2020-08-18 16:18:32,993 INFO  L276                IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions.
[2020-08-18 16:18:32,993 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 32
[2020-08-18 16:18:32,994 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 16:18:32,994 INFO  L422         BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 16:18:32,994 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-18 16:18:32,994 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 16:18:32,995 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 16:18:32,995 INFO  L82        PathProgramCache]: Analyzing trace with hash -1166508097, now seen corresponding path program 2 times
[2020-08-18 16:18:32,995 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 16:18:32,996 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1467755432]
[2020-08-18 16:18:32,996 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 16:18:33,014 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:33,050 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 16:18:33,052 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:33,077 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9
[2020-08-18 16:18:33,094 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:33,175 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22
[2020-08-18 16:18:33,177 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:33,182 INFO  L134       CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 16:18:33,182 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1467755432]
[2020-08-18 16:18:33,183 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 16:18:33,183 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9
[2020-08-18 16:18:33,183 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060669100]
[2020-08-18 16:18:33,184 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 9 states
[2020-08-18 16:18:33,184 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 16:18:33,184 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants.
[2020-08-18 16:18:33,185 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72
[2020-08-18 16:18:33,185 INFO  L87              Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 9 states.
[2020-08-18 16:18:33,380 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 16:18:33,380 INFO  L93              Difference]: Finished difference Result 51 states and 55 transitions.
[2020-08-18 16:18:33,380 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2020-08-18 16:18:33,380 INFO  L78                 Accepts]: Start accepts. Automaton has 9 states. Word has length 31
[2020-08-18 16:18:33,381 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 16:18:33,382 INFO  L225             Difference]: With dead ends: 51
[2020-08-18 16:18:33,382 INFO  L226             Difference]: Without dead ends: 37
[2020-08-18 16:18:33,383 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156
[2020-08-18 16:18:33,383 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 37 states.
[2020-08-18 16:18:33,388 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35.
[2020-08-18 16:18:33,389 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 35 states.
[2020-08-18 16:18:33,389 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 38 transitions.
[2020-08-18 16:18:33,390 INFO  L78                 Accepts]: Start accepts. Automaton has 35 states and 38 transitions. Word has length 31
[2020-08-18 16:18:33,390 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 16:18:33,390 INFO  L479      AbstractCegarLoop]: Abstraction has 35 states and 38 transitions.
[2020-08-18 16:18:33,390 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 9 states.
[2020-08-18 16:18:33,390 INFO  L276                IsEmpty]: Start isEmpty. Operand 35 states and 38 transitions.
[2020-08-18 16:18:33,391 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 35
[2020-08-18 16:18:33,391 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 16:18:33,392 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 16:18:33,392 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-18 16:18:33,392 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 16:18:33,392 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 16:18:33,392 INFO  L82        PathProgramCache]: Analyzing trace with hash -1706812894, now seen corresponding path program 3 times
[2020-08-18 16:18:33,393 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 16:18:33,393 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [507155401]
[2020-08-18 16:18:33,393 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 16:18:33,409 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:33,451 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 16:18:33,452 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:33,474 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9
[2020-08-18 16:18:33,485 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:33,538 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25
[2020-08-18 16:18:33,540 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:33,567 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked.
[2020-08-18 16:18:33,568 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [507155401]
[2020-08-18 16:18:33,568 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 16:18:33,569 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11
[2020-08-18 16:18:33,569 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837196459]
[2020-08-18 16:18:33,569 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 11 states
[2020-08-18 16:18:33,570 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 16:18:33,570 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2020-08-18 16:18:33,570 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110
[2020-08-18 16:18:33,570 INFO  L87              Difference]: Start difference. First operand 35 states and 38 transitions. Second operand 11 states.
[2020-08-18 16:18:33,827 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 16:18:33,827 INFO  L93              Difference]: Finished difference Result 43 states and 46 transitions.
[2020-08-18 16:18:33,828 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2020-08-18 16:18:33,828 INFO  L78                 Accepts]: Start accepts. Automaton has 11 states. Word has length 34
[2020-08-18 16:18:33,828 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 16:18:33,830 INFO  L225             Difference]: With dead ends: 43
[2020-08-18 16:18:33,830 INFO  L226             Difference]: Without dead ends: 36
[2020-08-18 16:18:33,831 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=193, Unknown=0, NotChecked=0, Total=240
[2020-08-18 16:18:33,832 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 36 states.
[2020-08-18 16:18:33,839 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36.
[2020-08-18 16:18:33,839 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 36 states.
[2020-08-18 16:18:33,840 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions.
[2020-08-18 16:18:33,840 INFO  L78                 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 34
[2020-08-18 16:18:33,841 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 16:18:33,841 INFO  L479      AbstractCegarLoop]: Abstraction has 36 states and 39 transitions.
[2020-08-18 16:18:33,841 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 11 states.
[2020-08-18 16:18:33,841 INFO  L276                IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions.
[2020-08-18 16:18:33,842 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 36
[2020-08-18 16:18:33,842 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 16:18:33,842 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 16:18:33,842 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-18 16:18:33,843 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 16:18:33,843 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 16:18:33,843 INFO  L82        PathProgramCache]: Analyzing trace with hash 991320762, now seen corresponding path program 1 times
[2020-08-18 16:18:33,843 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 16:18:33,844 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1982382737]
[2020-08-18 16:18:33,844 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 16:18:33,857 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:33,887 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 16:18:33,889 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:33,901 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9
[2020-08-18 16:18:33,907 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:33,962 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25
[2020-08-18 16:18:33,965 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:34,028 INFO  L134       CoverageAnalysis]: Checked inductivity of 13 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked.
[2020-08-18 16:18:34,029 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1982382737]
[2020-08-18 16:18:34,029 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 16:18:34,029 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14
[2020-08-18 16:18:34,029 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [642682700]
[2020-08-18 16:18:34,030 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 14 states
[2020-08-18 16:18:34,030 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 16:18:34,030 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants.
[2020-08-18 16:18:34,030 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182
[2020-08-18 16:18:34,030 INFO  L87              Difference]: Start difference. First operand 36 states and 39 transitions. Second operand 14 states.
[2020-08-18 16:18:34,455 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 16:18:34,455 INFO  L93              Difference]: Finished difference Result 44 states and 47 transitions.
[2020-08-18 16:18:34,456 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-08-18 16:18:34,456 INFO  L78                 Accepts]: Start accepts. Automaton has 14 states. Word has length 35
[2020-08-18 16:18:34,456 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 16:18:34,457 INFO  L225             Difference]: With dead ends: 44
[2020-08-18 16:18:34,457 INFO  L226             Difference]: Without dead ends: 37
[2020-08-18 16:18:34,461 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=77, Invalid=385, Unknown=0, NotChecked=0, Total=462
[2020-08-18 16:18:34,461 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 37 states.
[2020-08-18 16:18:34,471 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37.
[2020-08-18 16:18:34,473 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 37 states.
[2020-08-18 16:18:34,474 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions.
[2020-08-18 16:18:34,474 INFO  L78                 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 35
[2020-08-18 16:18:34,474 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 16:18:34,474 INFO  L479      AbstractCegarLoop]: Abstraction has 37 states and 40 transitions.
[2020-08-18 16:18:34,475 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 14 states.
[2020-08-18 16:18:34,476 INFO  L276                IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions.
[2020-08-18 16:18:34,476 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 37
[2020-08-18 16:18:34,477 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 16:18:34,477 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 16:18:34,477 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-18 16:18:34,478 INFO  L427      AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 16:18:34,478 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 16:18:34,478 INFO  L82        PathProgramCache]: Analyzing trace with hash -1265881822, now seen corresponding path program 2 times
[2020-08-18 16:18:34,478 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 16:18:34,479 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1397912496]
[2020-08-18 16:18:34,479 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 16:18:34,505 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:34,574 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 16:18:34,575 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:34,592 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9
[2020-08-18 16:18:34,599 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:34,611 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25
[2020-08-18 16:18:34,614 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 16:18:34,672 INFO  L134       CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked.
[2020-08-18 16:18:34,672 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1397912496]
[2020-08-18 16:18:34,673 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 16:18:34,674 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10
[2020-08-18 16:18:34,674 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [27416930]
[2020-08-18 16:18:34,674 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 10 states
[2020-08-18 16:18:34,675 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 16:18:34,675 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants.
[2020-08-18 16:18:34,675 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90
[2020-08-18 16:18:34,675 INFO  L87              Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 10 states.
[2020-08-18 16:18:34,991 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 16:18:34,991 INFO  L93              Difference]: Finished difference Result 55 states and 62 transitions.
[2020-08-18 16:18:34,992 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2020-08-18 16:18:34,993 INFO  L78                 Accepts]: Start accepts. Automaton has 10 states. Word has length 36
[2020-08-18 16:18:34,993 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 16:18:34,996 INFO  L225             Difference]: With dead ends: 55
[2020-08-18 16:18:34,997 INFO  L226             Difference]: Without dead ends: 51
[2020-08-18 16:18:34,998 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272
[2020-08-18 16:18:34,998 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 51 states.
[2020-08-18 16:18:35,014 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 47.
[2020-08-18 16:18:35,015 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 47 states.
[2020-08-18 16:18:35,018 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions.
[2020-08-18 16:18:35,018 INFO  L78                 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 36
[2020-08-18 16:18:35,019 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 16:18:35,019 INFO  L479      AbstractCegarLoop]: Abstraction has 47 states and 55 transitions.
[2020-08-18 16:18:35,019 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 10 states.
[2020-08-18 16:18:35,019 INFO  L276                IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions.
[2020-08-18 16:18:35,024 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 38
[2020-08-18 16:18:35,024 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 16:18:35,024 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 16:18:35,025 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6
[2020-08-18 16:18:35,025 INFO  L427      AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 16:18:35,025 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 16:18:35,025 INFO  L82        PathProgramCache]: Analyzing trace with hash 1775282106, now seen corresponding path program 3 times
[2020-08-18 16:18:35,026 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 16:18:35,027 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [328036272]
[2020-08-18 16:18:35,027 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 16:18:35,066 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2020-08-18 16:18:35,069 INFO  L174   FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace
[2020-08-18 16:18:35,069 INFO  L520         BasicCegarLoop]: Counterexample might be feasible
[2020-08-18 16:18:35,073 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7
[2020-08-18 16:18:35,090 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 04:18:35 BoogieIcfgContainer
[2020-08-18 16:18:35,090 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-08-18 16:18:35,092 INFO  L168              Benchmark]: Toolchain (without parser) took 4993.81 ms. Allocated memory was 143.1 MB in the beginning and 276.8 MB in the end (delta: 133.7 MB). Free memory was 105.3 MB in the beginning and 219.2 MB in the end (delta: -113.8 MB). Peak memory consumption was 19.9 MB. Max. memory is 7.1 GB.
[2020-08-18 16:18:35,093 INFO  L168              Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 143.1 MB. Free memory was 124.7 MB in the beginning and 124.4 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB.
[2020-08-18 16:18:35,094 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 817.76 ms. Allocated memory was 143.1 MB in the beginning and 207.1 MB in the end (delta: 64.0 MB). Free memory was 104.9 MB in the beginning and 173.8 MB in the end (delta: -68.9 MB). Peak memory consumption was 25.7 MB. Max. memory is 7.1 GB.
[2020-08-18 16:18:35,095 INFO  L168              Benchmark]: Boogie Preprocessor took 59.75 ms. Allocated memory is still 207.1 MB. Free memory was 173.8 MB in the beginning and 171.3 MB in the end (delta: 2.5 MB). Peak memory consumption was 2.5 MB. Max. memory is 7.1 GB.
[2020-08-18 16:18:35,096 INFO  L168              Benchmark]: RCFGBuilder took 601.17 ms. Allocated memory is still 207.1 MB. Free memory was 171.3 MB in the beginning and 128.2 MB in the end (delta: 43.1 MB). Peak memory consumption was 43.1 MB. Max. memory is 7.1 GB.
[2020-08-18 16:18:35,096 INFO  L168              Benchmark]: TraceAbstraction took 3510.35 ms. Allocated memory was 207.1 MB in the beginning and 276.8 MB in the end (delta: 69.7 MB). Free memory was 127.6 MB in the beginning and 219.2 MB in the end (delta: -91.6 MB). There was no memory consumed. Max. memory is 7.1 GB.
[2020-08-18 16:18:35,100 INFO  L336   ainManager$Toolchain]: #######################  End [Toolchain 1] #######################
 --- Results ---
 * Results from de.uni_freiburg.informatik.ultimate.core:
  - StatisticsResult: Toolchain Benchmarks
    Benchmark results are:
 * CDTParser took 0.20 ms. Allocated memory is still 143.1 MB. Free memory was 124.7 MB in the beginning and 124.4 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB.
 * CACSL2BoogieTranslator took 817.76 ms. Allocated memory was 143.1 MB in the beginning and 207.1 MB in the end (delta: 64.0 MB). Free memory was 104.9 MB in the beginning and 173.8 MB in the end (delta: -68.9 MB). Peak memory consumption was 25.7 MB. Max. memory is 7.1 GB.
 * Boogie Preprocessor took 59.75 ms. Allocated memory is still 207.1 MB. Free memory was 173.8 MB in the beginning and 171.3 MB in the end (delta: 2.5 MB). Peak memory consumption was 2.5 MB. Max. memory is 7.1 GB.
 * RCFGBuilder took 601.17 ms. Allocated memory is still 207.1 MB. Free memory was 171.3 MB in the beginning and 128.2 MB in the end (delta: 43.1 MB). Peak memory consumption was 43.1 MB. Max. memory is 7.1 GB.
 * TraceAbstraction took 3510.35 ms. Allocated memory was 207.1 MB in the beginning and 276.8 MB in the end (delta: 69.7 MB). Free memory was 127.6 MB in the beginning and 219.2 MB in the end (delta: -91.6 MB). There was no memory consumed. Max. memory is 7.1 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())
[L596]  CALL, EXPR  sll_create(len + 1)
[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]  RET, EXPR   sll_create(len + 1)
[L596]              SLL s = sll_create(len + 1);
[L597]  CALL, EXPR  sll_length(s)
[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]  RET, EXPR   sll_length(s)
[L597]  COND TRUE   len != sll_length(s)
[L602]              __VERIFIER_error()

  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 9 procedures, 48 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.4s, OverallIterations: 8, TraceHistogramMax: 3, AutomataDifference: 1.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 183 SDtfs, 300 SDslu, 499 SDs, 0 SdLazy, 896 SolverSat, 94 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 129 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=47occurred in iteration=7, 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, 7 MinimizatonAttempts, 20 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.0s InterpolantComputationTime, 249 NumberOfCodeBlocks, 249 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 205 ConstructedInterpolants, 0 QuantifiedInterpolants, 20626 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 7 InterpolantComputations, 3 PerfectInterpolantSequences, 33/46 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available
RESULT: Ultimate proved your program to be incorrect!
Received shutdown request...