/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=5000 --traceabstraction.additional.smt.options interpolation-heuristic=HIGHLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/afterrec-1.c


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


This is Ultimate 0.1.25-177f698
[2020-08-21 18:54:52,145 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-21 18:54:52,148 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-21 18:54:52,172 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-21 18:54:52,173 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-21 18:54:52,174 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-21 18:54:52,175 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-21 18:54:52,177 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-21 18:54:52,179 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-21 18:54:52,180 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-21 18:54:52,181 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-21 18:54:52,182 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-21 18:54:52,182 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-21 18:54:52,183 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-21 18:54:52,184 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-21 18:54:52,186 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-21 18:54:52,186 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-21 18:54:52,187 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-21 18:54:52,189 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-21 18:54:52,195 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-21 18:54:52,196 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-21 18:54:52,201 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-21 18:54:52,205 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-21 18:54:52,206 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-21 18:54:52,211 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-21 18:54:52,211 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-21 18:54:52,211 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-21 18:54:52,215 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-21 18:54:52,215 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-21 18:54:52,216 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-21 18:54:52,216 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-21 18:54:52,218 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-21 18:54:52,219 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-21 18:54:52,220 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-21 18:54:52,222 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-21 18:54:52,222 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-21 18:54:52,223 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-21 18:54:52,223 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-21 18:54:52,224 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-08-21 18:54:52,225 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-08-21 18:54:52,227 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-21 18:54:52,228 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
[2020-08-21 18:54:52,281 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-21 18:54:52,282 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-21 18:54:52,283 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-21 18:54:52,283 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-21 18:54:52,283 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-21 18:54:52,284 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-21 18:54:52,284 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-21 18:54:52,285 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-21 18:54:52,285 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-21 18:54:52,285 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-21 18:54:52,285 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-21 18:54:52,285 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-21 18:54:52,286 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-21 18:54:52,287 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-21 18:54:52,287 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-21 18:54:52,287 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-21 18:54:52,287 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-21 18:54:52,287 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-21 18:54:52,288 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-21 18:54:52,288 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-21 18:54:52,288 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-21 18:54:52,288 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-21 18:54:52,288 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-21 18:54:52,289 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-21 18:54:52,289 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-21 18:54:52,290 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-21 18:54:52,290 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-21 18:54:52,290 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-21 18:54:52,290 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-21 18:54:52,290 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=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true;
[2020-08-21 18:54:52,609 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-21 18:54:52,623 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-21 18:54:52,626 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-21 18:54:52,628 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-21 18:54:52,628 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-21 18:54:52,629 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec-1.c
[2020-08-21 18:54:52,704 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/009a7782b/4e10ab7d60904dd994d32e052835a628/FLAG00d07e84c
[2020-08-21 18:54:53,195 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-21 18:54:53,196 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/afterrec-1.c
[2020-08-21 18:54:53,203 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/009a7782b/4e10ab7d60904dd994d32e052835a628/FLAG00d07e84c
[2020-08-21 18:54:53,556 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/009a7782b/4e10ab7d60904dd994d32e052835a628
[2020-08-21 18:54:53,564 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-21 18:54:53,566 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-21 18:54:53,567 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-21 18:54:53,567 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-21 18:54:53,570 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-21 18:54:53,572 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:54:53" (1/1) ...
[2020-08-21 18:54:53,575 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@45241865 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:54:53, skipping insertion in model container
[2020-08-21 18:54:53,575 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:54:53" (1/1) ...
[2020-08-21 18:54:53,583 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-21 18:54:53,599 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-21 18:54:53,779 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 18:54:53,784 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-21 18:54:53,798 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-21 18:54:53,814 INFO  L208         MainTranslator]: Completed translation
[2020-08-21 18:54:53,814 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:54:53 WrapperNode
[2020-08-21 18:54:53,815 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-21 18:54:53,815 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-21 18:54:53,816 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-21 18:54:53,816 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-21 18:54:53,830 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:54:53" (1/1) ...
[2020-08-21 18:54:53,830 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:54:53" (1/1) ...
[2020-08-21 18:54:53,913 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:54:53" (1/1) ...
[2020-08-21 18:54:53,914 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:54:53" (1/1) ...
[2020-08-21 18:54:53,916 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:54:53" (1/1) ...
[2020-08-21 18:54:53,921 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:54:53" (1/1) ...
[2020-08-21 18:54:53,922 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:54:53" (1/1) ...
[2020-08-21 18:54:53,923 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-21 18:54:53,923 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-21 18:54:53,923 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-21 18:54:53,923 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-21 18:54:53,924 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:54:53" (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
[2020-08-21 18:54:53,982 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-21 18:54:53,982 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-21 18:54:53,983 INFO  L138     BoogieDeclarations]: Found implementation of procedure f
[2020-08-21 18:54:53,983 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-21 18:54:53,983 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-21 18:54:53,983 INFO  L130     BoogieDeclarations]: Found specification of procedure f
[2020-08-21 18:54:53,983 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-21 18:54:53,983 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-21 18:54:53,984 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-21 18:54:54,141 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-21 18:54:54,141 INFO  L295             CfgBuilder]: Removed 0 assume(true) statements.
[2020-08-21 18:54:54,145 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:54:54 BoogieIcfgContainer
[2020-08-21 18:54:54,145 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-21 18:54:54,146 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-21 18:54:54,146 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-21 18:54:54,150 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-21 18:54:54,150 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:54:53" (1/3) ...
[2020-08-21 18:54:54,151 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4151f1a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:54:54, skipping insertion in model container
[2020-08-21 18:54:54,151 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:54:53" (2/3) ...
[2020-08-21 18:54:54,152 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4151f1a3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:54:54, skipping insertion in model container
[2020-08-21 18:54:54,152 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:54:54" (3/3) ...
[2020-08-21 18:54:54,154 INFO  L109   eAbstractionObserver]: Analyzing ICFG afterrec-1.c
[2020-08-21 18:54:54,165 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-21 18:54:54,173 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-21 18:54:54,188 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-21 18:54:54,209 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-21 18:54:54,209 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-21 18:54:54,209 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-21 18:54:54,209 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-21 18:54:54,209 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-21 18:54:54,209 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-21 18:54:54,210 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-21 18:54:54,210 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-21 18:54:54,225 INFO  L276                IsEmpty]: Start isEmpty. Operand 16 states.
[2020-08-21 18:54:54,230 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 17
[2020-08-21 18:54:54,231 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-21 18:54:54,231 INFO  L422         BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-21 18:54:54,232 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-21 18:54:54,238 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-21 18:54:54,238 INFO  L82        PathProgramCache]: Analyzing trace with hash 1715138264, now seen corresponding path program 1 times
[2020-08-21 18:54:54,245 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-21 18:54:54,246 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1947170066]
[2020-08-21 18:54:54,246 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-21 18:54:54,335 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2020-08-21 18:54:54,338 INFO  L174   FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace
[2020-08-21 18:54:54,339 INFO  L520         BasicCegarLoop]: Counterexample might be feasible
[2020-08-21 18:54:54,343 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-21 18:54:54,357 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 06:54:54 BoogieIcfgContainer
[2020-08-21 18:54:54,358 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-08-21 18:54:54,361 INFO  L168              Benchmark]: Toolchain (without parser) took 794.07 ms. Allocated memory was 140.5 MB in the beginning and 202.4 MB in the end (delta: 61.9 MB). Free memory was 103.7 MB in the beginning and 159.1 MB in the end (delta: -55.4 MB). Peak memory consumption was 6.5 MB. Max. memory is 7.1 GB.
[2020-08-21 18:54:54,363 INFO  L168              Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB.
[2020-08-21 18:54:54,364 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 248.62 ms. Allocated memory is still 140.5 MB. Free memory was 103.5 MB in the beginning and 94.2 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB.
[2020-08-21 18:54:54,366 INFO  L168              Benchmark]: Boogie Preprocessor took 107.30 ms. Allocated memory was 140.5 MB in the beginning and 202.4 MB in the end (delta: 61.9 MB). Free memory was 94.2 MB in the beginning and 181.6 MB in the end (delta: -87.4 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB.
[2020-08-21 18:54:54,367 INFO  L168              Benchmark]: RCFGBuilder took 222.09 ms. Allocated memory is still 202.4 MB. Free memory was 181.6 MB in the beginning and 171.0 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB.
[2020-08-21 18:54:54,369 INFO  L168              Benchmark]: TraceAbstraction took 211.52 ms. Allocated memory is still 202.4 MB. Free memory was 170.4 MB in the beginning and 159.1 MB in the end (delta: 11.3 MB). Peak memory consumption was 11.3 MB. Max. memory is 7.1 GB.
[2020-08-21 18:54:54,374 INFO  L336   ainManager$Toolchain]: #######################  End [Toolchain 1] #######################
 --- Results ---
 * Results from de.uni_freiburg.informatik.ultimate.core:
  - StatisticsResult: Toolchain Benchmarks
    Benchmark results are:
 * CDTParser took 0.24 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB.
 * CACSL2BoogieTranslator took 248.62 ms. Allocated memory is still 140.5 MB. Free memory was 103.5 MB in the beginning and 94.2 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB.
 * Boogie Preprocessor took 107.30 ms. Allocated memory was 140.5 MB in the beginning and 202.4 MB in the end (delta: 61.9 MB). Free memory was 94.2 MB in the beginning and 181.6 MB in the end (delta: -87.4 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB.
 * RCFGBuilder took 222.09 ms. Allocated memory is still 202.4 MB. Free memory was 181.6 MB in the beginning and 171.0 MB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB.
 * TraceAbstraction took 211.52 ms. Allocated memory is still 202.4 MB. Free memory was 170.4 MB in the beginning and 159.1 MB in the end (delta: 11.3 MB). Peak memory consumption was 11.3 MB. Max. memory is 7.1 GB.
 * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction:
  - CounterExampleResult [Line: 7]: a call of __VERIFIER_error() is reachable
    a call of __VERIFIER_error() is reachable
We found a FailurePath: 
[L11]  CALL        f(4)
[L4]   COND FALSE  !(n<3)
[L5]               n--
[L6]   CALL        f(n)
[L4]   COND FALSE  !(n<3)
[L5]               n--
[L6]   CALL        f(n)
[L4]   COND TRUE   n<3
[L6]   RET         f(n)
[L7]               __VERIFIER_error()

  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 4 procedures, 16 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 0.1s, OverallIterations: 1, TraceHistogramMax: 3, AutomataDifference: 0.0s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=16occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 16 NumberOfCodeBlocks, 16 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 0 ConstructedInterpolants, 0 QuantifiedInterpolants, 0 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 0 InterpolantComputations, 0 PerfectInterpolantSequences, 0/0 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...