/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 --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/heap-manipulation/sll_to_dll_rev-1.i


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


This is Ultimate 0.1.25-5644d1e-m
[2020-08-18 20:18:40,607 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-18 20:18:40,610 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-18 20:18:40,655 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-18 20:18:40,655 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-18 20:18:40,656 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-18 20:18:40,658 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-18 20:18:40,659 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-18 20:18:40,661 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-18 20:18:40,662 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-18 20:18:40,663 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-18 20:18:40,664 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-18 20:18:40,664 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-18 20:18:40,665 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-18 20:18:40,667 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-18 20:18:40,668 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-18 20:18:40,669 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-18 20:18:40,670 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-18 20:18:40,672 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-18 20:18:40,673 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-18 20:18:40,675 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-18 20:18:40,676 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-18 20:18:40,677 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-18 20:18:40,678 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-18 20:18:40,680 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-18 20:18:40,681 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-18 20:18:40,681 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-18 20:18:40,682 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-18 20:18:40,683 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-18 20:18:40,684 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-18 20:18:40,684 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-18 20:18:40,685 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-18 20:18:40,685 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-18 20:18:40,686 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-18 20:18:40,687 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-18 20:18:40,687 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-18 20:18:40,688 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-18 20:18:40,688 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-18 20:18:40,688 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-08-18 20:18:40,689 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-08-18 20:18:40,690 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-18 20:18:40,691 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 20:18:40,712 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-18 20:18:40,713 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-18 20:18:40,714 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-18 20:18:40,714 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-18 20:18:40,714 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-18 20:18:40,715 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-18 20:18:40,715 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-18 20:18:40,715 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-18 20:18:40,715 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-18 20:18:40,715 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-18 20:18:40,716 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-18 20:18:40,716 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-18 20:18:40,716 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-18 20:18:40,716 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-18 20:18:40,716 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-18 20:18:40,717 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-18 20:18:40,717 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-18 20:18:40,717 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-18 20:18:40,717 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-18 20:18:40,717 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-18 20:18:40,720 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-18 20:18:40,720 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 20:18:40,720 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-18 20:18:40,720 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-18 20:18:40,720 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-18 20:18:40,721 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-18 20:18:40,721 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-18 20:18:40,721 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-18 20:18:40,721 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-18 20:18:40,721 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
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST;
[2020-08-18 20:18:41,023 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-18 20:18:41,036 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-18 20:18:41,040 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-18 20:18:41,042 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-18 20:18:41,042 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-18 20:18:41,043 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/heap-manipulation/sll_to_dll_rev-1.i
[2020-08-18 20:18:41,117 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8cd1ac1fa/0d9996d7a9e14a99b4a4b4c497cf9572/FLAG2c4579b1f
[2020-08-18 20:18:41,652 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-18 20:18:41,656 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/heap-manipulation/sll_to_dll_rev-1.i
[2020-08-18 20:18:41,675 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8cd1ac1fa/0d9996d7a9e14a99b4a4b4c497cf9572/FLAG2c4579b1f
[2020-08-18 20:18:42,005 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8cd1ac1fa/0d9996d7a9e14a99b4a4b4c497cf9572
[2020-08-18 20:18:42,015 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-18 20:18:42,017 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-18 20:18:42,018 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-18 20:18:42,018 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-18 20:18:42,022 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-18 20:18:42,023 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:18:42" (1/1) ...
[2020-08-18 20:18:42,026 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7a7ba94f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:42, skipping insertion in model container
[2020-08-18 20:18:42,026 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:18:42" (1/1) ...
[2020-08-18 20:18:42,034 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-18 20:18:42,092 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-18 20:18:42,568 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 20:18:42,575 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-18 20:18:42,630 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 20:18:42,709 INFO  L208         MainTranslator]: Completed translation
[2020-08-18 20:18:42,710 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:42 WrapperNode
[2020-08-18 20:18:42,710 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-18 20:18:42,711 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-18 20:18:42,711 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-18 20:18:42,711 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-18 20:18:42,725 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:42" (1/1) ...
[2020-08-18 20:18:42,726 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:42" (1/1) ...
[2020-08-18 20:18:42,744 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:42" (1/1) ...
[2020-08-18 20:18:42,745 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:42" (1/1) ...
[2020-08-18 20:18:42,768 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:42" (1/1) ...
[2020-08-18 20:18:42,782 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:42" (1/1) ...
[2020-08-18 20:18:42,786 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:42" (1/1) ...
[2020-08-18 20:18:42,795 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-18 20:18:42,796 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-18 20:18:42,796 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-18 20:18:42,796 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-18 20:18:42,797 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:42" (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 20:18:42,867 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-18 20:18:42,867 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-18 20:18:42,867 INFO  L138     BoogieDeclarations]: Found implementation of procedure __bswap_32
[2020-08-18 20:18:42,867 INFO  L138     BoogieDeclarations]: Found implementation of procedure __bswap_64
[2020-08-18 20:18:42,868 INFO  L138     BoogieDeclarations]: Found implementation of procedure fail
[2020-08-18 20:18:42,868 INFO  L138     BoogieDeclarations]: Found implementation of procedure alloc_node
[2020-08-18 20:18:42,868 INFO  L138     BoogieDeclarations]: Found implementation of procedure chain_node
[2020-08-18 20:18:42,868 INFO  L138     BoogieDeclarations]: Found implementation of procedure create_sll
[2020-08-18 20:18:42,868 INFO  L138     BoogieDeclarations]: Found implementation of procedure init_back_link
[2020-08-18 20:18:42,868 INFO  L138     BoogieDeclarations]: Found implementation of procedure reverse_dll
[2020-08-18 20:18:42,869 INFO  L138     BoogieDeclarations]: Found implementation of procedure remove_fw_link
[2020-08-18 20:18:42,869 INFO  L138     BoogieDeclarations]: Found implementation of procedure check_seq_next
[2020-08-18 20:18:42,869 INFO  L138     BoogieDeclarations]: Found implementation of procedure check_seq_prev
[2020-08-18 20:18:42,869 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-18 20:18:42,869 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-18 20:18:42,870 INFO  L130     BoogieDeclarations]: Found specification of procedure __bswap_32
[2020-08-18 20:18:42,870 INFO  L130     BoogieDeclarations]: Found specification of procedure __bswap_64
[2020-08-18 20:18:42,870 INFO  L130     BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max
[2020-08-18 20:18:42,870 INFO  L130     BoogieDeclarations]: Found specification of procedure atof
[2020-08-18 20:18:42,870 INFO  L130     BoogieDeclarations]: Found specification of procedure atoi
[2020-08-18 20:18:42,870 INFO  L130     BoogieDeclarations]: Found specification of procedure atol
[2020-08-18 20:18:42,871 INFO  L130     BoogieDeclarations]: Found specification of procedure atoll
[2020-08-18 20:18:42,871 INFO  L130     BoogieDeclarations]: Found specification of procedure strtod
[2020-08-18 20:18:42,871 INFO  L130     BoogieDeclarations]: Found specification of procedure strtof
[2020-08-18 20:18:42,871 INFO  L130     BoogieDeclarations]: Found specification of procedure strtold
[2020-08-18 20:18:42,871 INFO  L130     BoogieDeclarations]: Found specification of procedure strtol
[2020-08-18 20:18:42,871 INFO  L130     BoogieDeclarations]: Found specification of procedure strtoul
[2020-08-18 20:18:42,872 INFO  L130     BoogieDeclarations]: Found specification of procedure strtoq
[2020-08-18 20:18:42,872 INFO  L130     BoogieDeclarations]: Found specification of procedure strtouq
[2020-08-18 20:18:42,872 INFO  L130     BoogieDeclarations]: Found specification of procedure strtoll
[2020-08-18 20:18:42,872 INFO  L130     BoogieDeclarations]: Found specification of procedure strtoull
[2020-08-18 20:18:42,872 INFO  L130     BoogieDeclarations]: Found specification of procedure l64a
[2020-08-18 20:18:42,872 INFO  L130     BoogieDeclarations]: Found specification of procedure a64l
[2020-08-18 20:18:42,872 INFO  L130     BoogieDeclarations]: Found specification of procedure select
[2020-08-18 20:18:42,873 INFO  L130     BoogieDeclarations]: Found specification of procedure pselect
[2020-08-18 20:18:42,873 INFO  L130     BoogieDeclarations]: Found specification of procedure gnu_dev_major
[2020-08-18 20:18:42,873 INFO  L130     BoogieDeclarations]: Found specification of procedure gnu_dev_minor
[2020-08-18 20:18:42,873 INFO  L130     BoogieDeclarations]: Found specification of procedure gnu_dev_makedev
[2020-08-18 20:18:42,873 INFO  L130     BoogieDeclarations]: Found specification of procedure random
[2020-08-18 20:18:42,873 INFO  L130     BoogieDeclarations]: Found specification of procedure srandom
[2020-08-18 20:18:42,874 INFO  L130     BoogieDeclarations]: Found specification of procedure initstate
[2020-08-18 20:18:42,874 INFO  L130     BoogieDeclarations]: Found specification of procedure setstate
[2020-08-18 20:18:42,874 INFO  L130     BoogieDeclarations]: Found specification of procedure random_r
[2020-08-18 20:18:42,874 INFO  L130     BoogieDeclarations]: Found specification of procedure srandom_r
[2020-08-18 20:18:42,874 INFO  L130     BoogieDeclarations]: Found specification of procedure initstate_r
[2020-08-18 20:18:42,874 INFO  L130     BoogieDeclarations]: Found specification of procedure setstate_r
[2020-08-18 20:18:42,874 INFO  L130     BoogieDeclarations]: Found specification of procedure rand
[2020-08-18 20:18:42,875 INFO  L130     BoogieDeclarations]: Found specification of procedure srand
[2020-08-18 20:18:42,875 INFO  L130     BoogieDeclarations]: Found specification of procedure rand_r
[2020-08-18 20:18:42,875 INFO  L130     BoogieDeclarations]: Found specification of procedure drand48
[2020-08-18 20:18:42,875 INFO  L130     BoogieDeclarations]: Found specification of procedure erand48
[2020-08-18 20:18:42,875 INFO  L130     BoogieDeclarations]: Found specification of procedure lrand48
[2020-08-18 20:18:42,875 INFO  L130     BoogieDeclarations]: Found specification of procedure nrand48
[2020-08-18 20:18:42,876 INFO  L130     BoogieDeclarations]: Found specification of procedure mrand48
[2020-08-18 20:18:42,876 INFO  L130     BoogieDeclarations]: Found specification of procedure jrand48
[2020-08-18 20:18:42,876 INFO  L130     BoogieDeclarations]: Found specification of procedure srand48
[2020-08-18 20:18:42,876 INFO  L130     BoogieDeclarations]: Found specification of procedure seed48
[2020-08-18 20:18:42,876 INFO  L130     BoogieDeclarations]: Found specification of procedure lcong48
[2020-08-18 20:18:42,877 INFO  L130     BoogieDeclarations]: Found specification of procedure drand48_r
[2020-08-18 20:18:42,877 INFO  L130     BoogieDeclarations]: Found specification of procedure erand48_r
[2020-08-18 20:18:42,877 INFO  L130     BoogieDeclarations]: Found specification of procedure lrand48_r
[2020-08-18 20:18:42,877 INFO  L130     BoogieDeclarations]: Found specification of procedure nrand48_r
[2020-08-18 20:18:42,877 INFO  L130     BoogieDeclarations]: Found specification of procedure mrand48_r
[2020-08-18 20:18:42,877 INFO  L130     BoogieDeclarations]: Found specification of procedure jrand48_r
[2020-08-18 20:18:42,877 INFO  L130     BoogieDeclarations]: Found specification of procedure srand48_r
[2020-08-18 20:18:42,878 INFO  L130     BoogieDeclarations]: Found specification of procedure seed48_r
[2020-08-18 20:18:42,878 INFO  L130     BoogieDeclarations]: Found specification of procedure lcong48_r
[2020-08-18 20:18:42,878 INFO  L130     BoogieDeclarations]: Found specification of procedure malloc
[2020-08-18 20:18:42,878 INFO  L130     BoogieDeclarations]: Found specification of procedure calloc
[2020-08-18 20:18:42,878 INFO  L130     BoogieDeclarations]: Found specification of procedure realloc
[2020-08-18 20:18:42,878 INFO  L130     BoogieDeclarations]: Found specification of procedure free
[2020-08-18 20:18:42,878 INFO  L130     BoogieDeclarations]: Found specification of procedure cfree
[2020-08-18 20:18:42,879 INFO  L130     BoogieDeclarations]: Found specification of procedure alloca
[2020-08-18 20:18:42,879 INFO  L130     BoogieDeclarations]: Found specification of procedure valloc
[2020-08-18 20:18:42,879 INFO  L130     BoogieDeclarations]: Found specification of procedure posix_memalign
[2020-08-18 20:18:42,879 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-18 20:18:42,879 INFO  L130     BoogieDeclarations]: Found specification of procedure atexit
[2020-08-18 20:18:42,880 INFO  L130     BoogieDeclarations]: Found specification of procedure on_exit
[2020-08-18 20:18:42,880 INFO  L130     BoogieDeclarations]: Found specification of procedure exit
[2020-08-18 20:18:42,880 INFO  L130     BoogieDeclarations]: Found specification of procedure _Exit
[2020-08-18 20:18:42,880 INFO  L130     BoogieDeclarations]: Found specification of procedure getenv
[2020-08-18 20:18:42,880 INFO  L130     BoogieDeclarations]: Found specification of procedure putenv
[2020-08-18 20:18:42,880 INFO  L130     BoogieDeclarations]: Found specification of procedure setenv
[2020-08-18 20:18:42,880 INFO  L130     BoogieDeclarations]: Found specification of procedure unsetenv
[2020-08-18 20:18:42,881 INFO  L130     BoogieDeclarations]: Found specification of procedure clearenv
[2020-08-18 20:18:42,881 INFO  L130     BoogieDeclarations]: Found specification of procedure mktemp
[2020-08-18 20:18:42,881 INFO  L130     BoogieDeclarations]: Found specification of procedure mkstemp
[2020-08-18 20:18:42,881 INFO  L130     BoogieDeclarations]: Found specification of procedure mkstemps
[2020-08-18 20:18:42,881 INFO  L130     BoogieDeclarations]: Found specification of procedure mkdtemp
[2020-08-18 20:18:42,881 INFO  L130     BoogieDeclarations]: Found specification of procedure system
[2020-08-18 20:18:42,881 INFO  L130     BoogieDeclarations]: Found specification of procedure realpath
[2020-08-18 20:18:42,882 INFO  L130     BoogieDeclarations]: Found specification of procedure bsearch
[2020-08-18 20:18:42,882 INFO  L130     BoogieDeclarations]: Found specification of procedure qsort
[2020-08-18 20:18:42,882 INFO  L130     BoogieDeclarations]: Found specification of procedure abs
[2020-08-18 20:18:42,882 INFO  L130     BoogieDeclarations]: Found specification of procedure labs
[2020-08-18 20:18:42,882 INFO  L130     BoogieDeclarations]: Found specification of procedure llabs
[2020-08-18 20:18:42,882 INFO  L130     BoogieDeclarations]: Found specification of procedure div
[2020-08-18 20:18:42,882 INFO  L130     BoogieDeclarations]: Found specification of procedure ldiv
[2020-08-18 20:18:42,883 INFO  L130     BoogieDeclarations]: Found specification of procedure lldiv
[2020-08-18 20:18:42,883 INFO  L130     BoogieDeclarations]: Found specification of procedure ecvt
[2020-08-18 20:18:42,883 INFO  L130     BoogieDeclarations]: Found specification of procedure fcvt
[2020-08-18 20:18:42,883 INFO  L130     BoogieDeclarations]: Found specification of procedure gcvt
[2020-08-18 20:18:42,883 INFO  L130     BoogieDeclarations]: Found specification of procedure qecvt
[2020-08-18 20:18:42,883 INFO  L130     BoogieDeclarations]: Found specification of procedure qfcvt
[2020-08-18 20:18:42,883 INFO  L130     BoogieDeclarations]: Found specification of procedure qgcvt
[2020-08-18 20:18:42,884 INFO  L130     BoogieDeclarations]: Found specification of procedure ecvt_r
[2020-08-18 20:18:42,884 INFO  L130     BoogieDeclarations]: Found specification of procedure fcvt_r
[2020-08-18 20:18:42,884 INFO  L130     BoogieDeclarations]: Found specification of procedure qecvt_r
[2020-08-18 20:18:42,884 INFO  L130     BoogieDeclarations]: Found specification of procedure qfcvt_r
[2020-08-18 20:18:42,884 INFO  L130     BoogieDeclarations]: Found specification of procedure mblen
[2020-08-18 20:18:42,884 INFO  L130     BoogieDeclarations]: Found specification of procedure mbtowc
[2020-08-18 20:18:42,884 INFO  L130     BoogieDeclarations]: Found specification of procedure wctomb
[2020-08-18 20:18:42,885 INFO  L130     BoogieDeclarations]: Found specification of procedure mbstowcs
[2020-08-18 20:18:42,885 INFO  L130     BoogieDeclarations]: Found specification of procedure wcstombs
[2020-08-18 20:18:42,885 INFO  L130     BoogieDeclarations]: Found specification of procedure rpmatch
[2020-08-18 20:18:42,885 INFO  L130     BoogieDeclarations]: Found specification of procedure getsubopt
[2020-08-18 20:18:42,885 INFO  L130     BoogieDeclarations]: Found specification of procedure getloadavg
[2020-08-18 20:18:42,885 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-08-18 20:18:42,885 INFO  L130     BoogieDeclarations]: Found specification of procedure fail
[2020-08-18 20:18:42,886 INFO  L130     BoogieDeclarations]: Found specification of procedure alloc_node
[2020-08-18 20:18:42,886 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap
[2020-08-18 20:18:42,886 INFO  L130     BoogieDeclarations]: Found specification of procedure write~$Pointer$
[2020-08-18 20:18:42,886 INFO  L130     BoogieDeclarations]: Found specification of procedure chain_node
[2020-08-18 20:18:42,886 INFO  L130     BoogieDeclarations]: Found specification of procedure read~$Pointer$
[2020-08-18 20:18:42,886 INFO  L130     BoogieDeclarations]: Found specification of procedure create_sll
[2020-08-18 20:18:42,887 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack
[2020-08-18 20:18:42,887 INFO  L130     BoogieDeclarations]: Found specification of procedure write~init~$Pointer$
[2020-08-18 20:18:42,887 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc
[2020-08-18 20:18:42,887 INFO  L130     BoogieDeclarations]: Found specification of procedure init_back_link
[2020-08-18 20:18:42,887 INFO  L130     BoogieDeclarations]: Found specification of procedure reverse_dll
[2020-08-18 20:18:42,887 INFO  L130     BoogieDeclarations]: Found specification of procedure remove_fw_link
[2020-08-18 20:18:42,888 INFO  L130     BoogieDeclarations]: Found specification of procedure check_seq_next
[2020-08-18 20:18:42,888 INFO  L130     BoogieDeclarations]: Found specification of procedure check_seq_prev
[2020-08-18 20:18:42,888 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-18 20:18:42,888 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-18 20:18:42,888 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-18 20:18:43,598 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-18 20:18:43,598 INFO  L295             CfgBuilder]: Removed 33 assume(true) statements.
[2020-08-18 20:18:43,603 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:18:43 BoogieIcfgContainer
[2020-08-18 20:18:43,605 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-18 20:18:43,608 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-18 20:18:43,609 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-18 20:18:43,613 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-18 20:18:43,618 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 08:18:42" (1/3) ...
[2020-08-18 20:18:43,620 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67684b0a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:18:43, skipping insertion in model container
[2020-08-18 20:18:43,620 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:42" (2/3) ...
[2020-08-18 20:18:43,621 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@67684b0a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:18:43, skipping insertion in model container
[2020-08-18 20:18:43,621 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:18:43" (3/3) ...
[2020-08-18 20:18:43,625 INFO  L109   eAbstractionObserver]: Analyzing ICFG sll_to_dll_rev-1.i
[2020-08-18 20:18:43,637 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-18 20:18:43,648 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-18 20:18:43,662 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-18 20:18:43,695 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-18 20:18:43,696 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-18 20:18:43,696 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-18 20:18:43,696 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-18 20:18:43,696 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-18 20:18:43,697 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-18 20:18:43,697 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-18 20:18:43,697 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-18 20:18:43,748 INFO  L276                IsEmpty]: Start isEmpty. Operand 117 states.
[2020-08-18 20:18:43,757 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 25
[2020-08-18 20:18:43,757 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:18:43,758 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]
[2020-08-18 20:18:43,759 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [failErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:18:43,766 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:18:43,767 INFO  L82        PathProgramCache]: Analyzing trace with hash 1243342133, now seen corresponding path program 1 times
[2020-08-18 20:18:43,776 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:18:43,777 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [175275889]
[2020-08-18 20:18:43,777 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:18:43,901 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:43,968 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 20:18:43,971 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:43,991 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6
[2020-08-18 20:18:43,997 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:44,011 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 20:18:44,012 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [175275889]
[2020-08-18 20:18:44,015 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 20:18:44,015 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4
[2020-08-18 20:18:44,016 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1132411936]
[2020-08-18 20:18:44,021 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 4 states
[2020-08-18 20:18:44,022 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 20:18:44,037 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants.
[2020-08-18 20:18:44,038 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12
[2020-08-18 20:18:44,040 INFO  L87              Difference]: Start difference. First operand 117 states. Second operand 4 states.
[2020-08-18 20:18:44,403 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 20:18:44,403 INFO  L93              Difference]: Finished difference Result 234 states and 383 transitions.
[2020-08-18 20:18:44,404 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. 
[2020-08-18 20:18:44,405 INFO  L78                 Accepts]: Start accepts. Automaton has 4 states. Word has length 24
[2020-08-18 20:18:44,406 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 20:18:44,419 INFO  L225             Difference]: With dead ends: 234
[2020-08-18 20:18:44,419 INFO  L226             Difference]: Without dead ends: 118
[2020-08-18 20:18:44,425 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 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 20:18:44,445 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 118 states.
[2020-08-18 20:18:44,482 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 108.
[2020-08-18 20:18:44,483 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 108 states.
[2020-08-18 20:18:44,486 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 128 transitions.
[2020-08-18 20:18:44,488 INFO  L78                 Accepts]: Start accepts. Automaton has 108 states and 128 transitions. Word has length 24
[2020-08-18 20:18:44,489 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 20:18:44,489 INFO  L479      AbstractCegarLoop]: Abstraction has 108 states and 128 transitions.
[2020-08-18 20:18:44,489 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 4 states.
[2020-08-18 20:18:44,489 INFO  L276                IsEmpty]: Start isEmpty. Operand 108 states and 128 transitions.
[2020-08-18 20:18:44,492 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 50
[2020-08-18 20:18:44,492 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:18:44,493 INFO  L422         BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1]
[2020-08-18 20:18:44,493 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-18 20:18:44,493 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [failErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:18:44,494 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:18:44,494 INFO  L82        PathProgramCache]: Analyzing trace with hash -2076611886, now seen corresponding path program 1 times
[2020-08-18 20:18:44,494 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:18:44,494 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2131136461]
[2020-08-18 20:18:44,495 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:18:44,655 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:44,820 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 20:18:44,822 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:44,844 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6
[2020-08-18 20:18:44,870 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:45,231 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1
[2020-08-18 20:18:45,238 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:45,317 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1
[2020-08-18 20:18:45,322 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:45,372 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18
[2020-08-18 20:18:45,381 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:45,835 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1
[2020-08-18 20:18:45,845 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:46,026 INFO  L134       CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked.
[2020-08-18 20:18:46,026 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2131136461]
[2020-08-18 20:18:46,026 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 20:18:46,027 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24
[2020-08-18 20:18:46,027 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [809863432]
[2020-08-18 20:18:46,029 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 24 states
[2020-08-18 20:18:46,029 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 20:18:46,030 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants.
[2020-08-18 20:18:46,030 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=496, Unknown=0, NotChecked=0, Total=552
[2020-08-18 20:18:46,030 INFO  L87              Difference]: Start difference. First operand 108 states and 128 transitions. Second operand 24 states.
[2020-08-18 20:18:46,937 WARN  L193               SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 41
[2020-08-18 20:18:49,041 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 20:18:49,041 INFO  L93              Difference]: Finished difference Result 156 states and 192 transitions.
[2020-08-18 20:18:49,042 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. 
[2020-08-18 20:18:49,042 INFO  L78                 Accepts]: Start accepts. Automaton has 24 states. Word has length 49
[2020-08-18 20:18:49,043 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 20:18:49,045 INFO  L225             Difference]: With dead ends: 156
[2020-08-18 20:18:49,046 INFO  L226             Difference]: Without dead ends: 153
[2020-08-18 20:18:49,047 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 175 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=147, Invalid=1259, Unknown=0, NotChecked=0, Total=1406
[2020-08-18 20:18:49,048 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 153 states.
[2020-08-18 20:18:49,069 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 120.
[2020-08-18 20:18:49,070 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 120 states.
[2020-08-18 20:18:49,071 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 142 transitions.
[2020-08-18 20:18:49,072 INFO  L78                 Accepts]: Start accepts. Automaton has 120 states and 142 transitions. Word has length 49
[2020-08-18 20:18:49,072 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 20:18:49,072 INFO  L479      AbstractCegarLoop]: Abstraction has 120 states and 142 transitions.
[2020-08-18 20:18:49,073 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 24 states.
[2020-08-18 20:18:49,073 INFO  L276                IsEmpty]: Start isEmpty. Operand 120 states and 142 transitions.
[2020-08-18 20:18:49,074 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 52
[2020-08-18 20:18:49,074 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:18:49,075 INFO  L422         BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 20:18:49,075 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-18 20:18:49,075 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [failErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:18:49,076 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:18:49,076 INFO  L82        PathProgramCache]: Analyzing trace with hash 1536063324, now seen corresponding path program 1 times
[2020-08-18 20:18:49,076 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:18:49,076 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [672606580]
[2020-08-18 20:18:49,077 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:18:49,109 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:49,221 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 20:18:49,222 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:49,241 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6
[2020-08-18 20:18:49,265 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:49,529 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1
[2020-08-18 20:18:49,534 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:49,596 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1
[2020-08-18 20:18:49,601 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:49,643 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18
[2020-08-18 20:18:49,650 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:49,934 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1
[2020-08-18 20:18:49,939 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:50,078 INFO  L134       CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked.
[2020-08-18 20:18:50,078 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [672606580]
[2020-08-18 20:18:50,078 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 20:18:50,079 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24
[2020-08-18 20:18:50,079 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132193372]
[2020-08-18 20:18:50,080 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 24 states
[2020-08-18 20:18:50,080 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 20:18:50,080 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants.
[2020-08-18 20:18:50,081 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=497, Unknown=0, NotChecked=0, Total=552
[2020-08-18 20:18:50,081 INFO  L87              Difference]: Start difference. First operand 120 states and 142 transitions. Second operand 24 states.
[2020-08-18 20:18:52,586 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 20:18:52,587 INFO  L93              Difference]: Finished difference Result 159 states and 196 transitions.
[2020-08-18 20:18:52,587 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. 
[2020-08-18 20:18:52,588 INFO  L78                 Accepts]: Start accepts. Automaton has 24 states. Word has length 51
[2020-08-18 20:18:52,588 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 20:18:52,591 INFO  L225             Difference]: With dead ends: 159
[2020-08-18 20:18:52,594 INFO  L226             Difference]: Without dead ends: 156
[2020-08-18 20:18:52,596 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=150, Invalid=1332, Unknown=0, NotChecked=0, Total=1482
[2020-08-18 20:18:52,597 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 156 states.
[2020-08-18 20:18:52,647 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 120.
[2020-08-18 20:18:52,648 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 120 states.
[2020-08-18 20:18:52,649 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 141 transitions.
[2020-08-18 20:18:52,649 INFO  L78                 Accepts]: Start accepts. Automaton has 120 states and 141 transitions. Word has length 51
[2020-08-18 20:18:52,650 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 20:18:52,650 INFO  L479      AbstractCegarLoop]: Abstraction has 120 states and 141 transitions.
[2020-08-18 20:18:52,650 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 24 states.
[2020-08-18 20:18:52,650 INFO  L276                IsEmpty]: Start isEmpty. Operand 120 states and 141 transitions.
[2020-08-18 20:18:52,654 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 56
[2020-08-18 20:18:52,655 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:18:52,655 INFO  L422         BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 20:18:52,656 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-18 20:18:52,656 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [failErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:18:52,657 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:18:52,657 INFO  L82        PathProgramCache]: Analyzing trace with hash -1614179064, now seen corresponding path program 1 times
[2020-08-18 20:18:52,657 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:18:52,657 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [507803653]
[2020-08-18 20:18:52,658 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:18:52,697 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2020-08-18 20:18:52,700 INFO  L174   FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace
[2020-08-18 20:18:52,700 INFO  L520         BasicCegarLoop]: Counterexample might be feasible
[2020-08-18 20:18:52,705 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-18 20:18:52,727 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 08:18:52 BoogieIcfgContainer
[2020-08-18 20:18:52,728 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-08-18 20:18:52,730 INFO  L168              Benchmark]: Toolchain (without parser) took 10712.53 ms. Allocated memory was 141.0 MB in the beginning and 343.4 MB in the end (delta: 202.4 MB). Free memory was 102.4 MB in the beginning and 299.3 MB in the end (delta: -196.9 MB). Peak memory consumption was 5.5 MB. Max. memory is 7.1 GB.
[2020-08-18 20:18:52,731 INFO  L168              Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 141.0 MB. Free memory was 122.6 MB in the beginning and 122.4 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB.
[2020-08-18 20:18:52,732 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 692.53 ms. Allocated memory was 141.0 MB in the beginning and 202.9 MB in the end (delta: 61.9 MB). Free memory was 102.0 MB in the beginning and 166.6 MB in the end (delta: -64.6 MB). Peak memory consumption was 23.8 MB. Max. memory is 7.1 GB.
[2020-08-18 20:18:52,733 INFO  L168              Benchmark]: Boogie Preprocessor took 84.77 ms. Allocated memory is still 202.9 MB. Free memory was 166.6 MB in the beginning and 162.8 MB in the end (delta: 3.8 MB). Peak memory consumption was 3.8 MB. Max. memory is 7.1 GB.
[2020-08-18 20:18:52,735 INFO  L168              Benchmark]: RCFGBuilder took 809.32 ms. Allocated memory is still 202.9 MB. Free memory was 162.8 MB in the beginning and 99.3 MB in the end (delta: 63.5 MB). Peak memory consumption was 63.5 MB. Max. memory is 7.1 GB.
[2020-08-18 20:18:52,741 INFO  L168              Benchmark]: TraceAbstraction took 9119.50 ms. Allocated memory was 202.9 MB in the beginning and 343.4 MB in the end (delta: 140.5 MB). Free memory was 98.7 MB in the beginning and 299.3 MB in the end (delta: -200.6 MB). There was no memory consumed. Max. memory is 7.1 GB.
[2020-08-18 20:18:52,747 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 141.0 MB. Free memory was 122.6 MB in the beginning and 122.4 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB.
 * CACSL2BoogieTranslator took 692.53 ms. Allocated memory was 141.0 MB in the beginning and 202.9 MB in the end (delta: 61.9 MB). Free memory was 102.0 MB in the beginning and 166.6 MB in the end (delta: -64.6 MB). Peak memory consumption was 23.8 MB. Max. memory is 7.1 GB.
 * Boogie Preprocessor took 84.77 ms. Allocated memory is still 202.9 MB. Free memory was 166.6 MB in the beginning and 162.8 MB in the end (delta: 3.8 MB). Peak memory consumption was 3.8 MB. Max. memory is 7.1 GB.
 * RCFGBuilder took 809.32 ms. Allocated memory is still 202.9 MB. Free memory was 162.8 MB in the beginning and 99.3 MB in the end (delta: 63.5 MB). Peak memory consumption was 63.5 MB. Max. memory is 7.1 GB.
 * TraceAbstraction took 9119.50 ms. Allocated memory was 202.9 MB in the beginning and 343.4 MB in the end (delta: 140.5 MB). Free memory was 98.7 MB in the beginning and 299.3 MB in the end (delta: -200.6 MB). There was no memory consumed. Max. memory is 7.1 GB.
 * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction:
  - CounterExampleResult [Line: 554]: a call of __VERIFIER_error() is reachable
    a call of __VERIFIER_error() is reachable
We found a FailurePath: 
[L628]              const struct node *p1, *p2;
[L629]  CALL, EXPR  create_sll(&p1, &p2)
[L577]              struct node *list = ((void *)0);
[L579]  CALL        chain_node(&list)
[L571]  CALL, EXPR  alloc_node()
[L562]              struct node *ptr = malloc(sizeof *ptr);
[L563]  COND FALSE  !(!ptr)
[L565]              ptr->next = ((void *)0)
[L566]              ptr->prev = ((void *)0)
[L567]              return ptr;
[L571]  RET, EXPR   alloc_node()
[L571]              struct node *node = alloc_node();
[L572]  EXPR        \read(**ppnode)
[L572]              node->next = *ppnode
[L573]              *ppnode = node
[L579]  RET         chain_node(&list)
[L580]  COND FALSE  !(__VERIFIER_nondet_int())
[L581]  EXPR        \read(*list)
[L581]              *pp2 = list
[L582]  COND FALSE  !(__VERIFIER_nondet_int())
[L584]  EXPR        \read(*list)
[L584]              *pp1 = list
[L586]  CALL        chain_node(&list)
[L571]  CALL, EXPR  alloc_node()
[L562]              struct node *ptr = malloc(sizeof *ptr);
[L563]  COND FALSE  !(!ptr)
[L565]              ptr->next = ((void *)0)
[L566]              ptr->prev = ((void *)0)
[L567]              return ptr;
[L571]  RET, EXPR   alloc_node()
[L571]              struct node *node = alloc_node();
[L572]  EXPR        \read(**ppnode)
[L572]              node->next = *ppnode
[L573]              *ppnode = node
[L586]  RET         chain_node(&list)
[L587]  COND FALSE  !(__VERIFIER_nondet_int())
[L588]  EXPR        \read(*list)
[L588]              return list;
[L577]              struct node *list = ((void *)0);
[L588]              return list;
[L629]  RET, EXPR   create_sll(&p1, &p2)
[L629]              struct node *list = create_sll(&p1, &p2);
[L631]  EXPR        \read(*p1)
[L631]  EXPR        \read(*p2)
[L631]  CALL        check_seq_next(p1, p2)
[L615]  COND FALSE  !(!(beg))
[L616]  COND FALSE  !(!(end))
[L617]  EXPR        beg->next
[L617]              beg = beg->next
[L617]  COND TRUE   end != beg
[L618]  COND TRUE   !(beg)
[L618]  CALL        fail()
[L554]              __VERIFIER_error()

  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 14 procedures, 123 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 9.0s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 5.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 322 SDtfs, 478 SDslu, 1412 SDs, 0 SdLazy, 3522 SolverSat, 269 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 3.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 100 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 343 ImplicationChecksByTransitivity, 3.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=120occurred in iteration=2, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 3 MinimizatonAttempts, 79 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 2.4s InterpolantComputationTime, 179 NumberOfCodeBlocks, 179 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 121 ConstructedInterpolants, 0 QuantifiedInterpolants, 137746 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 1 PerfectInterpolantSequences, 8/20 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...