/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=SMALLEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/verifythis/tree_del_iter_incorrect.c


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


This is Ultimate 0.1.25-5644d1e-m
[2020-08-18 12:17:37,704 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-18 12:17:37,707 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-18 12:17:37,743 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-18 12:17:37,744 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-18 12:17:37,753 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-18 12:17:37,755 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-18 12:17:37,758 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-18 12:17:37,760 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-18 12:17:37,764 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-18 12:17:37,765 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-18 12:17:37,766 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-18 12:17:37,766 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-18 12:17:37,768 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-18 12:17:37,770 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-18 12:17:37,772 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-18 12:17:37,773 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-18 12:17:37,774 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-18 12:17:37,775 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-18 12:17:37,783 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-18 12:17:37,785 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-18 12:17:37,786 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-18 12:17:37,787 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-18 12:17:37,789 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-18 12:17:37,800 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-18 12:17:37,800 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-18 12:17:37,801 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-18 12:17:37,801 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-18 12:17:37,802 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-18 12:17:37,802 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-18 12:17:37,808 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-18 12:17:37,808 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-18 12:17:37,809 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-18 12:17:37,810 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-18 12:17:37,811 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-18 12:17:37,811 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-18 12:17:37,811 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-18 12:17:37,812 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-18 12:17:37,812 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-08-18 12:17:37,812 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-08-18 12:17:37,817 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-18 12:17:37,818 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 12:17:37,853 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-18 12:17:37,855 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-18 12:17:37,857 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-18 12:17:37,857 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-18 12:17:37,857 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-18 12:17:37,858 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-18 12:17:37,858 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-18 12:17:37,858 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-18 12:17:37,858 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-18 12:17:37,858 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-18 12:17:37,859 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-18 12:17:37,859 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-18 12:17:37,860 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-18 12:17:37,860 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-18 12:17:37,860 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-18 12:17:37,860 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-18 12:17:37,860 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-18 12:17:37,861 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-18 12:17:37,861 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-18 12:17:37,861 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-18 12:17:37,861 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-18 12:17:37,861 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 12:17:37,862 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-18 12:17:37,862 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-18 12:17:37,862 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-18 12:17:37,862 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-18 12:17:37,862 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-18 12:17:37,863 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-18 12:17:37,863 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-18 12:17:37,863 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=SMALLEST;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLEST;
[2020-08-18 12:17:38,182 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-18 12:17:38,193 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-18 12:17:38,196 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-18 12:17:38,197 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-18 12:17:38,198 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-18 12:17:38,198 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_del_iter_incorrect.c
[2020-08-18 12:17:38,251 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ef9f75924/17f61aefae6d420f926a48a1652aee37/FLAG3eb330344
[2020-08-18 12:17:38,695 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-18 12:17:38,696 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/verifythis/tree_del_iter_incorrect.c
[2020-08-18 12:17:38,703 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ef9f75924/17f61aefae6d420f926a48a1652aee37/FLAG3eb330344
[2020-08-18 12:17:39,092 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/ef9f75924/17f61aefae6d420f926a48a1652aee37
[2020-08-18 12:17:39,102 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-18 12:17:39,104 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-18 12:17:39,104 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-18 12:17:39,105 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-18 12:17:39,108 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-18 12:17:39,109 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 12:17:39" (1/1) ...
[2020-08-18 12:17:39,112 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f504857 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:17:39, skipping insertion in model container
[2020-08-18 12:17:39,112 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 12:17:39" (1/1) ...
[2020-08-18 12:17:39,120 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-18 12:17:39,145 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-18 12:17:39,376 WARN  L1484              CHandler]: Possible shadowing of function min
[2020-08-18 12:17:39,390 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 12:17:39,410 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-18 12:17:39,521 WARN  L1484              CHandler]: Possible shadowing of function min
[2020-08-18 12:17:39,531 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 12:17:39,550 INFO  L208         MainTranslator]: Completed translation
[2020-08-18 12:17:39,550 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:17:39 WrapperNode
[2020-08-18 12:17:39,550 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-18 12:17:39,551 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-18 12:17:39,551 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-18 12:17:39,551 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-18 12:17:39,561 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:17:39" (1/1) ...
[2020-08-18 12:17:39,562 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:17:39" (1/1) ...
[2020-08-18 12:17:39,573 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:17:39" (1/1) ...
[2020-08-18 12:17:39,573 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:17:39" (1/1) ...
[2020-08-18 12:17:39,591 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:17:39" (1/1) ...
[2020-08-18 12:17:39,596 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:17:39" (1/1) ...
[2020-08-18 12:17:39,599 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:17:39" (1/1) ...
[2020-08-18 12:17:39,603 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-18 12:17:39,603 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-18 12:17:39,604 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-18 12:17:39,604 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-18 12:17:39,605 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:17:39" (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 12:17:39,662 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-18 12:17:39,662 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-18 12:17:39,662 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-18 12:17:39,662 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2020-08-18 12:17:39,662 INFO  L138     BoogieDeclarations]: Found implementation of procedure nondet_tree
[2020-08-18 12:17:39,663 INFO  L138     BoogieDeclarations]: Found implementation of procedure min
[2020-08-18 12:17:39,663 INFO  L138     BoogieDeclarations]: Found implementation of procedure tree_del
[2020-08-18 12:17:39,663 INFO  L138     BoogieDeclarations]: Found implementation of procedure tree_inorder
[2020-08-18 12:17:39,663 INFO  L138     BoogieDeclarations]: Found implementation of procedure size
[2020-08-18 12:17:39,663 INFO  L138     BoogieDeclarations]: Found implementation of procedure task
[2020-08-18 12:17:39,663 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-18 12:17:39,664 INFO  L138     BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit
[2020-08-18 12:17:39,664 INFO  L130     BoogieDeclarations]: Found specification of procedure calloc
[2020-08-18 12:17:39,664 INFO  L130     BoogieDeclarations]: Found specification of procedure malloc
[2020-08-18 12:17:39,664 INFO  L130     BoogieDeclarations]: Found specification of procedure free
[2020-08-18 12:17:39,664 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-08-18 12:17:39,664 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-18 12:17:39,665 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-18 12:17:39,665 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-18 12:17:39,665 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-18 12:17:39,665 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2020-08-18 12:17:39,665 INFO  L130     BoogieDeclarations]: Found specification of procedure nondet_tree
[2020-08-18 12:17:39,665 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap
[2020-08-18 12:17:39,666 INFO  L130     BoogieDeclarations]: Found specification of procedure write~int
[2020-08-18 12:17:39,666 INFO  L130     BoogieDeclarations]: Found specification of procedure write~$Pointer$
[2020-08-18 12:17:39,666 INFO  L130     BoogieDeclarations]: Found specification of procedure min
[2020-08-18 12:17:39,666 INFO  L130     BoogieDeclarations]: Found specification of procedure read~$Pointer$
[2020-08-18 12:17:39,666 INFO  L130     BoogieDeclarations]: Found specification of procedure tree_del
[2020-08-18 12:17:39,666 INFO  L130     BoogieDeclarations]: Found specification of procedure read~int
[2020-08-18 12:17:39,667 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc
[2020-08-18 12:17:39,667 INFO  L130     BoogieDeclarations]: Found specification of procedure tree_inorder
[2020-08-18 12:17:39,667 INFO  L130     BoogieDeclarations]: Found specification of procedure size
[2020-08-18 12:17:39,667 INFO  L130     BoogieDeclarations]: Found specification of procedure task
[2020-08-18 12:17:39,667 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack
[2020-08-18 12:17:39,667 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.meminit
[2020-08-18 12:17:39,668 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-18 12:17:39,668 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-18 12:17:39,668 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-18 12:17:40,191 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-18 12:17:40,194 INFO  L295             CfgBuilder]: Removed 2 assume(true) statements.
[2020-08-18 12:17:40,200 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 12:17:40 BoogieIcfgContainer
[2020-08-18 12:17:40,200 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-18 12:17:40,202 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-18 12:17:40,203 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-18 12:17:40,206 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-18 12:17:40,206 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 12:17:39" (1/3) ...
[2020-08-18 12:17:40,207 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d6141c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 12:17:40, skipping insertion in model container
[2020-08-18 12:17:40,207 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 12:17:39" (2/3) ...
[2020-08-18 12:17:40,208 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1d6141c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 12:17:40, skipping insertion in model container
[2020-08-18 12:17:40,208 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 12:17:40" (3/3) ...
[2020-08-18 12:17:40,210 INFO  L109   eAbstractionObserver]: Analyzing ICFG tree_del_iter_incorrect.c
[2020-08-18 12:17:40,221 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-18 12:17:40,228 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-18 12:17:40,241 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-18 12:17:40,262 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-18 12:17:40,262 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-18 12:17:40,262 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-18 12:17:40,262 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-18 12:17:40,262 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-18 12:17:40,263 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-18 12:17:40,263 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-18 12:17:40,263 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-18 12:17:40,281 INFO  L276                IsEmpty]: Start isEmpty. Operand 96 states.
[2020-08-18 12:17:40,290 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 45
[2020-08-18 12:17:40,290 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 12:17:40,291 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 12:17:40,292 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 12:17:40,297 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 12:17:40,297 INFO  L82        PathProgramCache]: Analyzing trace with hash -1213743031, now seen corresponding path program 1 times
[2020-08-18 12:17:40,304 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 12:17:40,304 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513007548]
[2020-08-18 12:17:40,305 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 12:17:40,426 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:40,506 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 12:17:40,510 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:40,555 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5
[2020-08-18 12:17:40,557 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:40,562 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11
[2020-08-18 12:17:40,564 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:40,567 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17
[2020-08-18 12:17:40,569 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:40,576 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23
[2020-08-18 12:17:40,577 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:40,587 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29
[2020-08-18 12:17:40,589 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:40,612 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34
[2020-08-18 12:17:40,615 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:40,634 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 12:17:40,634 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513007548]
[2020-08-18 12:17:40,638 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 12:17:40,639 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6
[2020-08-18 12:17:40,640 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213676861]
[2020-08-18 12:17:40,647 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 6 states
[2020-08-18 12:17:40,650 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 12:17:40,663 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2020-08-18 12:17:40,665 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30
[2020-08-18 12:17:40,667 INFO  L87              Difference]: Start difference. First operand 96 states. Second operand 6 states.
[2020-08-18 12:17:41,115 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 12:17:41,115 INFO  L93              Difference]: Finished difference Result 168 states and 221 transitions.
[2020-08-18 12:17:41,116 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 12:17:41,117 INFO  L78                 Accepts]: Start accepts. Automaton has 6 states. Word has length 44
[2020-08-18 12:17:41,118 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 12:17:41,130 INFO  L225             Difference]: With dead ends: 168
[2020-08-18 12:17:41,130 INFO  L226             Difference]: Without dead ends: 95
[2020-08-18 12:17:41,135 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42
[2020-08-18 12:17:41,153 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 95 states.
[2020-08-18 12:17:41,188 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 88.
[2020-08-18 12:17:41,189 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 88 states.
[2020-08-18 12:17:41,192 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 109 transitions.
[2020-08-18 12:17:41,193 INFO  L78                 Accepts]: Start accepts. Automaton has 88 states and 109 transitions. Word has length 44
[2020-08-18 12:17:41,194 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 12:17:41,194 INFO  L479      AbstractCegarLoop]: Abstraction has 88 states and 109 transitions.
[2020-08-18 12:17:41,194 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 6 states.
[2020-08-18 12:17:41,195 INFO  L276                IsEmpty]: Start isEmpty. Operand 88 states and 109 transitions.
[2020-08-18 12:17:41,198 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 45
[2020-08-18 12:17:41,198 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 12:17:41,198 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 12:17:41,199 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-18 12:17:41,199 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 12:17:41,199 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 12:17:41,200 INFO  L82        PathProgramCache]: Analyzing trace with hash 1392280523, now seen corresponding path program 1 times
[2020-08-18 12:17:41,200 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 12:17:41,200 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1640479243]
[2020-08-18 12:17:41,200 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 12:17:41,241 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:41,315 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 12:17:41,317 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:41,334 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5
[2020-08-18 12:17:41,335 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:41,342 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11
[2020-08-18 12:17:41,343 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:41,351 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17
[2020-08-18 12:17:41,359 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:41,387 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23
[2020-08-18 12:17:41,389 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:41,431 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29
[2020-08-18 12:17:41,433 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:41,450 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34
[2020-08-18 12:17:41,452 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:41,458 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 12:17:41,458 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1640479243]
[2020-08-18 12:17:41,459 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 12:17:41,459 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11
[2020-08-18 12:17:41,460 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934854494]
[2020-08-18 12:17:41,461 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 11 states
[2020-08-18 12:17:41,462 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 12:17:41,462 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2020-08-18 12:17:41,462 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110
[2020-08-18 12:17:41,462 INFO  L87              Difference]: Start difference. First operand 88 states and 109 transitions. Second operand 11 states.
[2020-08-18 12:17:42,129 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 12:17:42,129 INFO  L93              Difference]: Finished difference Result 154 states and 197 transitions.
[2020-08-18 12:17:42,129 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2020-08-18 12:17:42,130 INFO  L78                 Accepts]: Start accepts. Automaton has 11 states. Word has length 44
[2020-08-18 12:17:42,130 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 12:17:42,136 INFO  L225             Difference]: With dead ends: 154
[2020-08-18 12:17:42,136 INFO  L226             Difference]: Without dead ends: 97
[2020-08-18 12:17:42,138 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272
[2020-08-18 12:17:42,141 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 97 states.
[2020-08-18 12:17:42,160 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 90.
[2020-08-18 12:17:42,161 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 90 states.
[2020-08-18 12:17:42,162 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 113 transitions.
[2020-08-18 12:17:42,163 INFO  L78                 Accepts]: Start accepts. Automaton has 90 states and 113 transitions. Word has length 44
[2020-08-18 12:17:42,163 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 12:17:42,163 INFO  L479      AbstractCegarLoop]: Abstraction has 90 states and 113 transitions.
[2020-08-18 12:17:42,163 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 11 states.
[2020-08-18 12:17:42,164 INFO  L276                IsEmpty]: Start isEmpty. Operand 90 states and 113 transitions.
[2020-08-18 12:17:42,166 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 57
[2020-08-18 12:17:42,166 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 12:17:42,166 INFO  L422         BasicCegarLoop]: trace histogram [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, 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 12:17:42,166 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-18 12:17:42,167 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 12:17:42,167 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 12:17:42,167 INFO  L82        PathProgramCache]: Analyzing trace with hash 1672920772, now seen corresponding path program 1 times
[2020-08-18 12:17:42,167 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 12:17:42,168 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1560488218]
[2020-08-18 12:17:42,168 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 12:17:42,189 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:42,245 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 12:17:42,247 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:42,268 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5
[2020-08-18 12:17:42,272 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:42,295 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11
[2020-08-18 12:17:42,297 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:42,300 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17
[2020-08-18 12:17:42,305 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:42,347 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2
[2020-08-18 12:17:42,350 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:42,352 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8
[2020-08-18 12:17:42,354 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:42,357 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35
[2020-08-18 12:17:42,358 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:42,370 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41
[2020-08-18 12:17:42,372 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:42,390 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46
[2020-08-18 12:17:42,392 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:42,399 INFO  L134       CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2020-08-18 12:17:42,400 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1560488218]
[2020-08-18 12:17:42,400 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 12:17:42,400 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12
[2020-08-18 12:17:42,401 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847847629]
[2020-08-18 12:17:42,401 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 12 states
[2020-08-18 12:17:42,401 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 12:17:42,402 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2020-08-18 12:17:42,402 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132
[2020-08-18 12:17:42,402 INFO  L87              Difference]: Start difference. First operand 90 states and 113 transitions. Second operand 12 states.
[2020-08-18 12:17:43,149 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 12:17:43,150 INFO  L93              Difference]: Finished difference Result 164 states and 209 transitions.
[2020-08-18 12:17:43,150 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-08-18 12:17:43,150 INFO  L78                 Accepts]: Start accepts. Automaton has 12 states. Word has length 56
[2020-08-18 12:17:43,151 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 12:17:43,153 INFO  L225             Difference]: With dead ends: 164
[2020-08-18 12:17:43,153 INFO  L226             Difference]: Without dead ends: 96
[2020-08-18 12:17:43,154 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=89, Invalid=291, Unknown=0, NotChecked=0, Total=380
[2020-08-18 12:17:43,155 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 96 states.
[2020-08-18 12:17:43,168 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 92.
[2020-08-18 12:17:43,168 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 92 states.
[2020-08-18 12:17:43,169 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 116 transitions.
[2020-08-18 12:17:43,170 INFO  L78                 Accepts]: Start accepts. Automaton has 92 states and 116 transitions. Word has length 56
[2020-08-18 12:17:43,170 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 12:17:43,170 INFO  L479      AbstractCegarLoop]: Abstraction has 92 states and 116 transitions.
[2020-08-18 12:17:43,170 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 12 states.
[2020-08-18 12:17:43,170 INFO  L276                IsEmpty]: Start isEmpty. Operand 92 states and 116 transitions.
[2020-08-18 12:17:43,173 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 67
[2020-08-18 12:17:43,173 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 12:17:43,173 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 12:17:43,173 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-18 12:17:43,173 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 12:17:43,174 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 12:17:43,174 INFO  L82        PathProgramCache]: Analyzing trace with hash -1614566559, now seen corresponding path program 1 times
[2020-08-18 12:17:43,174 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 12:17:43,174 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [189489729]
[2020-08-18 12:17:43,175 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 12:17:43,195 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:43,248 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 12:17:43,250 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:43,266 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5
[2020-08-18 12:17:43,276 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:43,300 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1
[2020-08-18 12:17:43,303 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:43,305 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6
[2020-08-18 12:17:43,307 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:43,310 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21
[2020-08-18 12:17:43,311 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:43,331 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27
[2020-08-18 12:17:43,335 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:43,339 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2
[2020-08-18 12:17:43,340 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:43,341 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8
[2020-08-18 12:17:43,342 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:43,343 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45
[2020-08-18 12:17:43,344 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:43,357 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51
[2020-08-18 12:17:43,358 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:43,381 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56
[2020-08-18 12:17:43,383 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:43,389 INFO  L134       CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked.
[2020-08-18 12:17:43,389 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [189489729]
[2020-08-18 12:17:43,389 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 12:17:43,390 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13
[2020-08-18 12:17:43,390 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849828652]
[2020-08-18 12:17:43,390 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 13 states
[2020-08-18 12:17:43,391 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 12:17:43,391 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2020-08-18 12:17:43,391 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156
[2020-08-18 12:17:43,392 INFO  L87              Difference]: Start difference. First operand 92 states and 116 transitions. Second operand 13 states.
[2020-08-18 12:17:44,068 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 12:17:44,068 INFO  L93              Difference]: Finished difference Result 163 states and 208 transitions.
[2020-08-18 12:17:44,068 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. 
[2020-08-18 12:17:44,069 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states. Word has length 66
[2020-08-18 12:17:44,069 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 12:17:44,071 INFO  L225             Difference]: With dead ends: 163
[2020-08-18 12:17:44,071 INFO  L226             Difference]: Without dead ends: 98
[2020-08-18 12:17:44,073 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420
[2020-08-18 12:17:44,074 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 98 states.
[2020-08-18 12:17:44,088 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 94.
[2020-08-18 12:17:44,088 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 94 states.
[2020-08-18 12:17:44,090 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 119 transitions.
[2020-08-18 12:17:44,090 INFO  L78                 Accepts]: Start accepts. Automaton has 94 states and 119 transitions. Word has length 66
[2020-08-18 12:17:44,090 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 12:17:44,090 INFO  L479      AbstractCegarLoop]: Abstraction has 94 states and 119 transitions.
[2020-08-18 12:17:44,090 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 13 states.
[2020-08-18 12:17:44,091 INFO  L276                IsEmpty]: Start isEmpty. Operand 94 states and 119 transitions.
[2020-08-18 12:17:44,092 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 80
[2020-08-18 12:17:44,093 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 12:17:44,093 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1]
[2020-08-18 12:17:44,093 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-18 12:17:44,093 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 12:17:44,093 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 12:17:44,094 INFO  L82        PathProgramCache]: Analyzing trace with hash -1598247989, now seen corresponding path program 1 times
[2020-08-18 12:17:44,094 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 12:17:44,094 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1312492913]
[2020-08-18 12:17:44,094 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 12:17:44,121 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:44,164 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 12:17:44,165 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:44,180 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5
[2020-08-18 12:17:44,187 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:44,210 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1
[2020-08-18 12:17:44,212 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:44,214 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6
[2020-08-18 12:17:44,216 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:44,218 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21
[2020-08-18 12:17:44,221 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:44,225 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2
[2020-08-18 12:17:44,226 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:44,227 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8
[2020-08-18 12:17:44,228 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:44,229 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40
[2020-08-18 12:17:44,232 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:44,236 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2
[2020-08-18 12:17:44,236 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:44,238 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8
[2020-08-18 12:17:44,238 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:44,240 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58
[2020-08-18 12:17:44,242 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:44,258 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64
[2020-08-18 12:17:44,260 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:44,274 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69
[2020-08-18 12:17:44,276 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 12:17:44,311 INFO  L134       CoverageAnalysis]: Checked inductivity of 33 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked.
[2020-08-18 12:17:44,311 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1312492913]
[2020-08-18 12:17:44,311 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 12:17:44,311 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13
[2020-08-18 12:17:44,312 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612880687]
[2020-08-18 12:17:44,312 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 13 states
[2020-08-18 12:17:44,312 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 12:17:44,313 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2020-08-18 12:17:44,313 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156
[2020-08-18 12:17:44,313 INFO  L87              Difference]: Start difference. First operand 94 states and 119 transitions. Second operand 13 states.
[2020-08-18 12:17:44,975 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 12:17:44,975 INFO  L93              Difference]: Finished difference Result 151 states and 192 transitions.
[2020-08-18 12:17:44,976 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. 
[2020-08-18 12:17:44,976 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states. Word has length 79
[2020-08-18 12:17:44,976 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 12:17:44,978 INFO  L225             Difference]: With dead ends: 151
[2020-08-18 12:17:44,978 INFO  L226             Difference]: Without dead ends: 98
[2020-08-18 12:17:44,979 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462
[2020-08-18 12:17:44,980 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 98 states.
[2020-08-18 12:17:44,992 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 96.
[2020-08-18 12:17:44,992 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 96 states.
[2020-08-18 12:17:44,993 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 123 transitions.
[2020-08-18 12:17:44,994 INFO  L78                 Accepts]: Start accepts. Automaton has 96 states and 123 transitions. Word has length 79
[2020-08-18 12:17:44,994 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 12:17:44,994 INFO  L479      AbstractCegarLoop]: Abstraction has 96 states and 123 transitions.
[2020-08-18 12:17:44,994 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 13 states.
[2020-08-18 12:17:44,995 INFO  L276                IsEmpty]: Start isEmpty. Operand 96 states and 123 transitions.
[2020-08-18 12:17:44,996 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 92
[2020-08-18 12:17:44,996 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 12:17:44,997 INFO  L422         BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 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, 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 12:17:44,997 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-18 12:17:44,997 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 12:17:44,997 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 12:17:44,998 INFO  L82        PathProgramCache]: Analyzing trace with hash -1471493578, now seen corresponding path program 1 times
[2020-08-18 12:17:44,998 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 12:17:44,998 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1279715127]
[2020-08-18 12:17:44,998 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 12:17:45,034 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2020-08-18 12:17:45,037 INFO  L174   FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace
[2020-08-18 12:17:45,037 INFO  L520         BasicCegarLoop]: Counterexample might be feasible
[2020-08-18 12:17:45,041 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-18 12:17:45,062 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 12:17:45 BoogieIcfgContainer
[2020-08-18 12:17:45,062 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-08-18 12:17:45,065 INFO  L168              Benchmark]: Toolchain (without parser) took 5960.55 ms. Allocated memory was 140.5 MB in the beginning and 284.7 MB in the end (delta: 144.2 MB). Free memory was 102.0 MB in the beginning and 166.4 MB in the end (delta: -64.4 MB). Peak memory consumption was 79.8 MB. Max. memory is 7.1 GB.
[2020-08-18 12:17:45,066 INFO  L168              Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 140.5 MB. Free memory was 120.8 MB in the beginning and 120.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB.
[2020-08-18 12:17:45,067 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 446.18 ms. Allocated memory was 140.5 MB in the beginning and 201.9 MB in the end (delta: 61.3 MB). Free memory was 101.8 MB in the beginning and 177.9 MB in the end (delta: -76.2 MB). Peak memory consumption was 22.2 MB. Max. memory is 7.1 GB.
[2020-08-18 12:17:45,068 INFO  L168              Benchmark]: Boogie Preprocessor took 52.18 ms. Allocated memory is still 201.9 MB. Free memory was 177.9 MB in the beginning and 175.4 MB in the end (delta: 2.5 MB). Peak memory consumption was 2.5 MB. Max. memory is 7.1 GB.
[2020-08-18 12:17:45,068 INFO  L168              Benchmark]: RCFGBuilder took 596.89 ms. Allocated memory is still 201.9 MB. Free memory was 175.4 MB in the beginning and 140.4 MB in the end (delta: 35.0 MB). Peak memory consumption was 35.0 MB. Max. memory is 7.1 GB.
[2020-08-18 12:17:45,069 INFO  L168              Benchmark]: TraceAbstraction took 4860.88 ms. Allocated memory was 201.9 MB in the beginning and 284.7 MB in the end (delta: 82.8 MB). Free memory was 140.4 MB in the beginning and 166.4 MB in the end (delta: -26.0 MB). Peak memory consumption was 56.8 MB. Max. memory is 7.1 GB.
[2020-08-18 12:17:45,073 INFO  L336   ainManager$Toolchain]: #######################  End [Toolchain 1] #######################
 --- Results ---
 * Results from de.uni_freiburg.informatik.ultimate.core:
  - StatisticsResult: Toolchain Benchmarks
    Benchmark results are:
 * CDTParser took 0.17 ms. Allocated memory is still 140.5 MB. Free memory was 120.8 MB in the beginning and 120.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB.
 * CACSL2BoogieTranslator took 446.18 ms. Allocated memory was 140.5 MB in the beginning and 201.9 MB in the end (delta: 61.3 MB). Free memory was 101.8 MB in the beginning and 177.9 MB in the end (delta: -76.2 MB). Peak memory consumption was 22.2 MB. Max. memory is 7.1 GB.
 * Boogie Preprocessor took 52.18 ms. Allocated memory is still 201.9 MB. Free memory was 177.9 MB in the beginning and 175.4 MB in the end (delta: 2.5 MB). Peak memory consumption was 2.5 MB. Max. memory is 7.1 GB.
 * RCFGBuilder took 596.89 ms. Allocated memory is still 201.9 MB. Free memory was 175.4 MB in the beginning and 140.4 MB in the end (delta: 35.0 MB). Peak memory consumption was 35.0 MB. Max. memory is 7.1 GB.
 * TraceAbstraction took 4860.88 ms. Allocated memory was 201.9 MB in the beginning and 284.7 MB in the end (delta: 82.8 MB). Free memory was 140.4 MB in the beginning and 166.4 MB in the end (delta: -26.0 MB). Peak memory consumption was 56.8 MB. Max. memory is 7.1 GB.
 * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction:
  - CounterExampleResult [Line: 14]: a call of __VERIFIER_error() is reachable
    a call of __VERIFIER_error() is reachable
We found a FailurePath: 
[L103]  CALL, EXPR   nondet_tree()
[L23]   COND FALSE   !(__VERIFIER_nondet_bool())
[L26]                struct node *n = (struct node *)malloc(sizeof(struct node));
[L27]                n->data = __VERIFIER_nondet_int()
[L28]   CALL, EXPR   nondet_tree()
[L23]   COND TRUE    __VERIFIER_nondet_bool()
[L24]                return 0;
[L28]   RET, EXPR    nondet_tree()
[L28]                n->left = nondet_tree()
[L29]   CALL, EXPR   nondet_tree()
[L23]   COND TRUE    __VERIFIER_nondet_bool()
[L24]                return 0;
[L29]   RET, EXPR    nondet_tree()
[L29]                n->right = nondet_tree()
[L30]                return n;
[L103]  RET, EXPR    nondet_tree()
[L103]  CALL         task(nondet_tree())
[L81]   CALL, EXPR   min(t)
[L35]   COND FALSE   !(!n)
[L38]   EXPR         n->left
[L38]   CALL, EXPR   min(n->left)
[L35]   COND TRUE    !n
[L36]                return 2147483647;
[L38]   RET, EXPR    min(n->left)
[L38]                int a = min(n->left);
[L39]   EXPR         n->right
[L39]   CALL, EXPR   min(n->right)
[L35]   COND TRUE    !n
[L36]                return 2147483647;
[L39]   RET, EXPR    min(n->right)
[L39]                int b = min(n->right);
[L40]   COND TRUE    a <= b
[L40]                return a;
[L81]   RET, EXPR    min(t)
[L81]                int a = min(t);
[L82]                int b;
[L84]   CALL, EXPR   size(t)
[L76]   COND FALSE   !(!t)
[L77]   EXPR         t->left
[L77]   CALL, EXPR   size(t->left)
[L76]   COND TRUE    !t
[L76]                return 0;
[L77]   RET, EXPR    size(t->left)
[L77]   EXPR         t->right
[L77]   CALL, EXPR   size(t->right)
[L76]   COND TRUE    !t
[L76]                return 0;
[L77]   RET, EXPR    size(t->right)
[L77]                return size(t->left) + size(t->right) + 1;
[L84]   RET, EXPR    size(t)
[L84]                int n = size(t);
[L85]   CALL         assume_abort_if_not(n != 0)
[L10]   COND FALSE   !(!cond)
[L85]   RET          assume_abort_if_not(n != 0)
[L86]   EXPR, FCALL  calloc(n, sizeof(int))
[L86]                int *x = calloc(n, sizeof(int));
[L87]   CALL         tree_inorder(t, x, n)
[L65]   COND FALSE   !(!t)
[L68]   EXPR         t->left
[L68]   CALL, EXPR   tree_inorder(t->left,  a, i)
[L65]   COND TRUE    !t
[L66]                return i;
[L68]   RET, EXPR    tree_inorder(t->left,  a, i)
[L68]                i = tree_inorder(t->left,  a, i)
[L69]   EXPR         i++
[L69]   EXPR         t->data
[L69]                a[i++] = t->data
[L70]   EXPR         t->right
[L70]   CALL, EXPR   tree_inorder(t->right, a, i)
[L65]   COND TRUE    !t
[L66]                return i;
[L70]   RET, EXPR    tree_inorder(t->right, a, i)
[L70]                i = tree_inorder(t->right, a, i)
[L71]                return i;
[L87]   RET          tree_inorder(t, x, n)
[L88]   EXPR         x[0]
[L88]   CALL         __VERIFIER_assert(a == x[0])
[L14]   COND TRUE    !cond
[L14]                __VERIFIER_error()

  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 12 procedures, 96 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.7s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 3.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 418 SDtfs, 667 SDslu, 1336 SDs, 0 SdLazy, 1975 SolverSat, 666 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 163 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 1.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=96occurred 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: 0.1s AutomataMinimizationTime, 5 MinimizatonAttempts, 24 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 380 NumberOfCodeBlocks, 380 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 284 ConstructedInterpolants, 0 QuantifiedInterpolants, 45045 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 5 InterpolantComputations, 4 PerfectInterpolantSequences, 64/66 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...