/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SHALLOWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/verifythis/tree_del_rec_incorrect.c


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


This is Ultimate 0.1.25-5644d1e-m
[2020-08-18 20:18:11,788 INFO  L177        SettingsManager]: Resetting all preferences to default values...
[2020-08-18 20:18:11,791 INFO  L181        SettingsManager]: Resetting UltimateCore preferences to default values
[2020-08-18 20:18:11,818 INFO  L184        SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-08-18 20:18:11,818 INFO  L181        SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-08-18 20:18:11,819 INFO  L181        SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-08-18 20:18:11,820 INFO  L181        SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-08-18 20:18:11,822 INFO  L181        SettingsManager]: Resetting LassoRanker preferences to default values
[2020-08-18 20:18:11,824 INFO  L181        SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-08-18 20:18:11,825 INFO  L181        SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-08-18 20:18:11,826 INFO  L181        SettingsManager]: Resetting Sifa preferences to default values
[2020-08-18 20:18:11,827 INFO  L184        SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-08-18 20:18:11,828 INFO  L181        SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-08-18 20:18:11,829 INFO  L181        SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-08-18 20:18:11,830 INFO  L181        SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-08-18 20:18:11,831 INFO  L181        SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-08-18 20:18:11,832 INFO  L181        SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-08-18 20:18:11,833 INFO  L181        SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-08-18 20:18:11,834 INFO  L181        SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-08-18 20:18:11,836 INFO  L181        SettingsManager]: Resetting CodeCheck preferences to default values
[2020-08-18 20:18:11,838 INFO  L181        SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-08-18 20:18:11,839 INFO  L181        SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-08-18 20:18:11,840 INFO  L181        SettingsManager]: Resetting Referee preferences to default values
[2020-08-18 20:18:11,841 INFO  L181        SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-08-18 20:18:11,843 INFO  L184        SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-08-18 20:18:11,843 INFO  L184        SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-08-18 20:18:11,844 INFO  L181        SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-08-18 20:18:11,844 INFO  L181        SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-08-18 20:18:11,845 INFO  L181        SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-08-18 20:18:11,846 INFO  L184        SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-08-18 20:18:11,846 INFO  L181        SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-08-18 20:18:11,847 INFO  L181        SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-08-18 20:18:11,847 INFO  L181        SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-08-18 20:18:11,848 INFO  L181        SettingsManager]: Resetting Witness Printer preferences to default values
[2020-08-18 20:18:11,849 INFO  L184        SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-08-18 20:18:11,849 INFO  L181        SettingsManager]: Resetting CDTParser preferences to default values
[2020-08-18 20:18:11,850 INFO  L184        SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-08-18 20:18:11,850 INFO  L184        SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-08-18 20:18:11,850 INFO  L181        SettingsManager]: Resetting SmtParser preferences to default values
[2020-08-18 20:18:11,851 INFO  L181        SettingsManager]: Resetting Witness Parser preferences to default values
[2020-08-18 20:18:11,852 INFO  L188        SettingsManager]: Finished resetting all preferences to default values...
[2020-08-18 20:18:11,853 INFO  L101        SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-08-18 20:18:11,879 INFO  L113        SettingsManager]: Loading preferences was successful
[2020-08-18 20:18:11,879 INFO  L115        SettingsManager]: Preferences different from defaults after loading the file:
[2020-08-18 20:18:11,884 INFO  L136        SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-08-18 20:18:11,884 INFO  L138        SettingsManager]:  * Create parallel compositions if possible=false
[2020-08-18 20:18:11,884 INFO  L138        SettingsManager]:  * Use SBE=true
[2020-08-18 20:18:11,884 INFO  L136        SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-08-18 20:18:11,884 INFO  L138        SettingsManager]:  * sizeof long=4
[2020-08-18 20:18:11,885 INFO  L138        SettingsManager]:  * Overapproximate operations on floating types=true
[2020-08-18 20:18:11,885 INFO  L138        SettingsManager]:  * sizeof POINTER=4
[2020-08-18 20:18:11,885 INFO  L138        SettingsManager]:  * Check division by zero=IGNORE
[2020-08-18 20:18:11,885 INFO  L138        SettingsManager]:  * Pointer to allocated memory at dereference=IGNORE
[2020-08-18 20:18:11,885 INFO  L138        SettingsManager]:  * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-08-18 20:18:11,885 INFO  L138        SettingsManager]:  * Check array bounds for arrays that are off heap=IGNORE
[2020-08-18 20:18:11,885 INFO  L138        SettingsManager]:  * sizeof long double=12
[2020-08-18 20:18:11,887 INFO  L138        SettingsManager]:  * Check if freed pointer was valid=false
[2020-08-18 20:18:11,887 INFO  L138        SettingsManager]:  * Use constant arrays=true
[2020-08-18 20:18:11,887 INFO  L138        SettingsManager]:  * Pointer base address is valid at dereference=IGNORE
[2020-08-18 20:18:11,887 INFO  L136        SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-08-18 20:18:11,888 INFO  L138        SettingsManager]:  * Size of a code block=SequenceOfStatements
[2020-08-18 20:18:11,888 INFO  L138        SettingsManager]:  * To the following directory=./dump/
[2020-08-18 20:18:11,888 INFO  L138        SettingsManager]:  * SMT solver=External_DefaultMode
[2020-08-18 20:18:11,888 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 20:18:11,888 INFO  L136        SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-08-18 20:18:11,889 INFO  L138        SettingsManager]:  * Compute Interpolants along a Counterexample=FPandBP
[2020-08-18 20:18:11,889 INFO  L138        SettingsManager]:  * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-08-18 20:18:11,889 INFO  L138        SettingsManager]:  * Trace refinement strategy=CAMEL
[2020-08-18 20:18:11,889 INFO  L138        SettingsManager]:  * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-08-18 20:18:11,889 INFO  L138        SettingsManager]:  * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-08-18 20:18:11,889 INFO  L138        SettingsManager]:  * Trace refinement exception blacklist=NONE
[2020-08-18 20:18:11,890 INFO  L138        SettingsManager]:  * SMT solver=External_ModelsAndUnsatCoreMode
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST;
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST;
[2020-08-18 20:18:12,224 INFO  L75    nceAwareModelManager]: Repository-Root is: /tmp
[2020-08-18 20:18:12,233 INFO  L258   ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-08-18 20:18:12,237 INFO  L214   ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-08-18 20:18:12,239 INFO  L271        PluginConnector]: Initializing CDTParser...
[2020-08-18 20:18:12,239 INFO  L275        PluginConnector]: CDTParser initialized
[2020-08-18 20:18:12,240 INFO  L429   ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_del_rec_incorrect.c
[2020-08-18 20:18:12,318 INFO  L220              CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/71df020ba/6fbe57e527da4a9895e8be2cba2d2275/FLAG21137aeed
[2020-08-18 20:18:12,810 INFO  L306              CDTParser]: Found 1 translation units.
[2020-08-18 20:18:12,811 INFO  L160              CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/verifythis/tree_del_rec_incorrect.c
[2020-08-18 20:18:12,825 INFO  L349              CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/71df020ba/6fbe57e527da4a9895e8be2cba2d2275/FLAG21137aeed
[2020-08-18 20:18:13,281 INFO  L357              CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/71df020ba/6fbe57e527da4a9895e8be2cba2d2275
[2020-08-18 20:18:13,290 INFO  L296   ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-08-18 20:18:13,292 INFO  L131        ToolchainWalker]: Walking toolchain with 4 elements.
[2020-08-18 20:18:13,293 INFO  L113        PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-08-18 20:18:13,293 INFO  L271        PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-08-18 20:18:13,296 INFO  L275        PluginConnector]: CACSL2BoogieTranslator initialized
[2020-08-18 20:18:13,298 INFO  L185        PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:18:13" (1/1) ...
[2020-08-18 20:18:13,300 INFO  L205        PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@30741c12 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:13, skipping insertion in model container
[2020-08-18 20:18:13,301 INFO  L185        PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:18:13" (1/1) ...
[2020-08-18 20:18:13,308 INFO  L145         MainTranslator]: Starting translation in SV-COMP mode 
[2020-08-18 20:18:13,330 INFO  L178         MainTranslator]: Built tables and reachable declarations
[2020-08-18 20:18:13,510 WARN  L1484              CHandler]: Possible shadowing of function min
[2020-08-18 20:18:13,512 WARN  L1484              CHandler]: Possible shadowing of function min
[2020-08-18 20:18:13,531 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 20:18:13,546 INFO  L203         MainTranslator]: Completed pre-run
[2020-08-18 20:18:13,655 WARN  L1484              CHandler]: Possible shadowing of function min
[2020-08-18 20:18:13,658 WARN  L1484              CHandler]: Possible shadowing of function min
[2020-08-18 20:18:13,685 INFO  L206          PostProcessor]: Analyzing one entry point: main
[2020-08-18 20:18:13,706 INFO  L208         MainTranslator]: Completed translation
[2020-08-18 20:18:13,706 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:13 WrapperNode
[2020-08-18 20:18:13,706 INFO  L132        PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-08-18 20:18:13,707 INFO  L113        PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-08-18 20:18:13,707 INFO  L271        PluginConnector]: Initializing Boogie Preprocessor...
[2020-08-18 20:18:13,708 INFO  L275        PluginConnector]: Boogie Preprocessor initialized
[2020-08-18 20:18:13,719 INFO  L185        PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:13" (1/1) ...
[2020-08-18 20:18:13,719 INFO  L185        PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:13" (1/1) ...
[2020-08-18 20:18:13,731 INFO  L185        PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:13" (1/1) ...
[2020-08-18 20:18:13,731 INFO  L185        PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:13" (1/1) ...
[2020-08-18 20:18:13,748 INFO  L185        PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:13" (1/1) ...
[2020-08-18 20:18:13,753 INFO  L185        PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:13" (1/1) ...
[2020-08-18 20:18:13,756 INFO  L185        PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:13" (1/1) ...
[2020-08-18 20:18:13,760 INFO  L132        PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-08-18 20:18:13,761 INFO  L113        PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-08-18 20:18:13,761 INFO  L271        PluginConnector]: Initializing RCFGBuilder...
[2020-08-18 20:18:13,761 INFO  L275        PluginConnector]: RCFGBuilder initialized
[2020-08-18 20:18:13,762 INFO  L185        PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:13" (1/1) ...
No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-08-18 20:18:13,830 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-08-18 20:18:13,830 INFO  L138     BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-08-18 20:18:13,831 INFO  L138     BoogieDeclarations]: Found implementation of procedure assume_abort_if_not
[2020-08-18 20:18:13,831 INFO  L138     BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2020-08-18 20:18:13,831 INFO  L138     BoogieDeclarations]: Found implementation of procedure nondet_tree
[2020-08-18 20:18:13,832 INFO  L138     BoogieDeclarations]: Found implementation of procedure min
[2020-08-18 20:18:13,833 INFO  L138     BoogieDeclarations]: Found implementation of procedure tree_del
[2020-08-18 20:18:13,833 INFO  L138     BoogieDeclarations]: Found implementation of procedure tree_inorder
[2020-08-18 20:18:13,833 INFO  L138     BoogieDeclarations]: Found implementation of procedure size
[2020-08-18 20:18:13,834 INFO  L138     BoogieDeclarations]: Found implementation of procedure task
[2020-08-18 20:18:13,834 INFO  L138     BoogieDeclarations]: Found implementation of procedure main
[2020-08-18 20:18:13,836 INFO  L138     BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit
[2020-08-18 20:18:13,836 INFO  L130     BoogieDeclarations]: Found specification of procedure calloc
[2020-08-18 20:18:13,837 INFO  L130     BoogieDeclarations]: Found specification of procedure malloc
[2020-08-18 20:18:13,837 INFO  L130     BoogieDeclarations]: Found specification of procedure free
[2020-08-18 20:18:13,837 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-08-18 20:18:13,838 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-08-18 20:18:13,838 INFO  L130     BoogieDeclarations]: Found specification of procedure abort
[2020-08-18 20:18:13,838 INFO  L130     BoogieDeclarations]: Found specification of procedure assume_abort_if_not
[2020-08-18 20:18:13,839 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-08-18 20:18:13,839 INFO  L130     BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2020-08-18 20:18:13,840 INFO  L130     BoogieDeclarations]: Found specification of procedure nondet_tree
[2020-08-18 20:18:13,840 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap
[2020-08-18 20:18:13,840 INFO  L130     BoogieDeclarations]: Found specification of procedure write~int
[2020-08-18 20:18:13,841 INFO  L130     BoogieDeclarations]: Found specification of procedure write~$Pointer$
[2020-08-18 20:18:13,841 INFO  L130     BoogieDeclarations]: Found specification of procedure min
[2020-08-18 20:18:13,841 INFO  L130     BoogieDeclarations]: Found specification of procedure read~$Pointer$
[2020-08-18 20:18:13,841 INFO  L130     BoogieDeclarations]: Found specification of procedure tree_del
[2020-08-18 20:18:13,841 INFO  L130     BoogieDeclarations]: Found specification of procedure read~int
[2020-08-18 20:18:13,841 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc
[2020-08-18 20:18:13,841 INFO  L130     BoogieDeclarations]: Found specification of procedure tree_inorder
[2020-08-18 20:18:13,842 INFO  L130     BoogieDeclarations]: Found specification of procedure size
[2020-08-18 20:18:13,842 INFO  L130     BoogieDeclarations]: Found specification of procedure task
[2020-08-18 20:18:13,842 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack
[2020-08-18 20:18:13,842 INFO  L130     BoogieDeclarations]: Found specification of procedure #Ultimate.meminit
[2020-08-18 20:18:13,842 INFO  L130     BoogieDeclarations]: Found specification of procedure main
[2020-08-18 20:18:13,842 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-08-18 20:18:13,843 INFO  L130     BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-08-18 20:18:14,363 INFO  L290             CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-08-18 20:18:14,363 INFO  L295             CfgBuilder]: Removed 1 assume(true) statements.
[2020-08-18 20:18:14,369 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:18:14 BoogieIcfgContainer
[2020-08-18 20:18:14,369 INFO  L132        PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-08-18 20:18:14,371 INFO  L113        PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-08-18 20:18:14,371 INFO  L271        PluginConnector]: Initializing TraceAbstraction...
[2020-08-18 20:18:14,374 INFO  L275        PluginConnector]: TraceAbstraction initialized
[2020-08-18 20:18:14,375 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 08:18:13" (1/3) ...
[2020-08-18 20:18:14,376 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@593937ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:18:14, skipping insertion in model container
[2020-08-18 20:18:14,376 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:18:13" (2/3) ...
[2020-08-18 20:18:14,377 INFO  L205        PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@593937ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:18:14, skipping insertion in model container
[2020-08-18 20:18:14,377 INFO  L185        PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:18:14" (3/3) ...
[2020-08-18 20:18:14,379 INFO  L109   eAbstractionObserver]: Analyzing ICFG tree_del_rec_incorrect.c
[2020-08-18 20:18:14,390 INFO  L157   ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION
[2020-08-18 20:18:14,399 INFO  L169   ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-08-18 20:18:14,414 INFO  L251      AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-08-18 20:18:14,442 INFO  L375      AbstractCegarLoop]: Interprodecural is true
[2020-08-18 20:18:14,442 INFO  L376      AbstractCegarLoop]: Hoare is true
[2020-08-18 20:18:14,442 INFO  L377      AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation
[2020-08-18 20:18:14,443 INFO  L378      AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-08-18 20:18:14,443 INFO  L379      AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-08-18 20:18:14,443 INFO  L380      AbstractCegarLoop]: Difference is false
[2020-08-18 20:18:14,443 INFO  L381      AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-08-18 20:18:14,444 INFO  L385      AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-08-18 20:18:14,467 INFO  L276                IsEmpty]: Start isEmpty. Operand 95 states.
[2020-08-18 20:18:14,477 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 45
[2020-08-18 20:18:14,478 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:18:14,479 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 20:18:14,479 INFO  L427      AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:18:14,486 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:18:14,486 INFO  L82        PathProgramCache]: Analyzing trace with hash 1217563597, now seen corresponding path program 1 times
[2020-08-18 20:18:14,496 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:18:14,497 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [318235344]
[2020-08-18 20:18:14,497 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:18:14,637 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:14,728 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 20:18:14,731 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:14,759 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5
[2020-08-18 20:18:14,762 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:14,768 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11
[2020-08-18 20:18:14,773 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:14,781 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17
[2020-08-18 20:18:14,783 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:14,787 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23
[2020-08-18 20:18:14,788 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:14,800 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29
[2020-08-18 20:18:14,802 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:14,823 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34
[2020-08-18 20:18:14,827 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:14,842 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 20:18:14,843 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [318235344]
[2020-08-18 20:18:14,845 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 20:18:14,846 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6
[2020-08-18 20:18:14,846 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59964799]
[2020-08-18 20:18:14,852 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 6 states
[2020-08-18 20:18:14,852 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 20:18:14,867 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants.
[2020-08-18 20:18:14,868 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30
[2020-08-18 20:18:14,870 INFO  L87              Difference]: Start difference. First operand 95 states. Second operand 6 states.
[2020-08-18 20:18:15,391 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 20:18:15,391 INFO  L93              Difference]: Finished difference Result 165 states and 215 transitions.
[2020-08-18 20:18:15,394 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. 
[2020-08-18 20:18:15,398 INFO  L78                 Accepts]: Start accepts. Automaton has 6 states. Word has length 44
[2020-08-18 20:18:15,398 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 20:18:15,420 INFO  L225             Difference]: With dead ends: 165
[2020-08-18 20:18:15,421 INFO  L226             Difference]: Without dead ends: 93
[2020-08-18 20:18:15,428 INFO  L675         BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42
[2020-08-18 20:18:15,451 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 93 states.
[2020-08-18 20:18:15,534 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 87.
[2020-08-18 20:18:15,536 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 87 states.
[2020-08-18 20:18:15,544 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 108 transitions.
[2020-08-18 20:18:15,547 INFO  L78                 Accepts]: Start accepts. Automaton has 87 states and 108 transitions. Word has length 44
[2020-08-18 20:18:15,548 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 20:18:15,549 INFO  L479      AbstractCegarLoop]: Abstraction has 87 states and 108 transitions.
[2020-08-18 20:18:15,549 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 6 states.
[2020-08-18 20:18:15,549 INFO  L276                IsEmpty]: Start isEmpty. Operand 87 states and 108 transitions.
[2020-08-18 20:18:15,555 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 45
[2020-08-18 20:18:15,556 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:18:15,557 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 20:18:15,557 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0
[2020-08-18 20:18:15,558 INFO  L427      AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:18:15,560 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:18:15,560 INFO  L82        PathProgramCache]: Analyzing trace with hash -471380145, now seen corresponding path program 1 times
[2020-08-18 20:18:15,560 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:18:15,561 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1569011083]
[2020-08-18 20:18:15,561 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:18:15,653 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:15,749 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 20:18:15,753 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:15,775 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5
[2020-08-18 20:18:15,776 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:15,782 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11
[2020-08-18 20:18:15,786 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:15,788 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17
[2020-08-18 20:18:15,791 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:15,810 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23
[2020-08-18 20:18:15,812 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:15,848 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29
[2020-08-18 20:18:15,850 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:15,870 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34
[2020-08-18 20:18:15,872 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:15,879 INFO  L134       CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-08-18 20:18:15,879 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1569011083]
[2020-08-18 20:18:15,880 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 20:18:15,880 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11
[2020-08-18 20:18:15,880 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1120614622]
[2020-08-18 20:18:15,882 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 11 states
[2020-08-18 20:18:15,882 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 20:18:15,883 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants.
[2020-08-18 20:18:15,883 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=88, Unknown=0, NotChecked=0, Total=110
[2020-08-18 20:18:15,883 INFO  L87              Difference]: Start difference. First operand 87 states and 108 transitions. Second operand 11 states.
[2020-08-18 20:18:16,570 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 20:18:16,570 INFO  L93              Difference]: Finished difference Result 151 states and 194 transitions.
[2020-08-18 20:18:16,570 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. 
[2020-08-18 20:18:16,571 INFO  L78                 Accepts]: Start accepts. Automaton has 11 states. Word has length 44
[2020-08-18 20:18:16,571 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 20:18:16,574 INFO  L225             Difference]: With dead ends: 151
[2020-08-18 20:18:16,574 INFO  L226             Difference]: Without dead ends: 95
[2020-08-18 20:18:16,576 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 20:18:16,577 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 95 states.
[2020-08-18 20:18:16,592 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 89.
[2020-08-18 20:18:16,592 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 89 states.
[2020-08-18 20:18:16,594 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 112 transitions.
[2020-08-18 20:18:16,594 INFO  L78                 Accepts]: Start accepts. Automaton has 89 states and 112 transitions. Word has length 44
[2020-08-18 20:18:16,595 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 20:18:16,595 INFO  L479      AbstractCegarLoop]: Abstraction has 89 states and 112 transitions.
[2020-08-18 20:18:16,595 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 11 states.
[2020-08-18 20:18:16,595 INFO  L276                IsEmpty]: Start isEmpty. Operand 89 states and 112 transitions.
[2020-08-18 20:18:16,597 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 57
[2020-08-18 20:18:16,598 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:18:16,598 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 20:18:16,598 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1
[2020-08-18 20:18:16,599 INFO  L427      AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:18:16,599 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:18:16,599 INFO  L82        PathProgramCache]: Analyzing trace with hash 800610240, now seen corresponding path program 1 times
[2020-08-18 20:18:16,599 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:18:16,600 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [796643080]
[2020-08-18 20:18:16,600 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:18:16,622 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:16,688 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 20:18:16,690 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:16,710 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5
[2020-08-18 20:18:16,713 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:16,736 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11
[2020-08-18 20:18:16,739 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:16,743 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17
[2020-08-18 20:18:16,748 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:16,794 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2
[2020-08-18 20:18:16,796 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:16,798 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8
[2020-08-18 20:18:16,800 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:16,803 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35
[2020-08-18 20:18:16,804 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:16,818 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41
[2020-08-18 20:18:16,819 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:16,839 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46
[2020-08-18 20:18:16,840 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:16,848 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 20:18:16,849 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [796643080]
[2020-08-18 20:18:16,849 INFO  L220   FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences.
[2020-08-18 20:18:16,849 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12
[2020-08-18 20:18:16,850 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [558606240]
[2020-08-18 20:18:16,850 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 12 states
[2020-08-18 20:18:16,850 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 20:18:16,851 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants.
[2020-08-18 20:18:16,851 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132
[2020-08-18 20:18:16,851 INFO  L87              Difference]: Start difference. First operand 89 states and 112 transitions. Second operand 12 states.
[2020-08-18 20:18:17,620 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 20:18:17,621 INFO  L93              Difference]: Finished difference Result 161 states and 206 transitions.
[2020-08-18 20:18:17,621 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. 
[2020-08-18 20:18:17,621 INFO  L78                 Accepts]: Start accepts. Automaton has 12 states. Word has length 56
[2020-08-18 20:18:17,622 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 20:18:17,624 INFO  L225             Difference]: With dead ends: 161
[2020-08-18 20:18:17,624 INFO  L226             Difference]: Without dead ends: 94
[2020-08-18 20:18:17,630 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 20:18:17,631 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 94 states.
[2020-08-18 20:18:17,653 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 91.
[2020-08-18 20:18:17,653 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 91 states.
[2020-08-18 20:18:17,656 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 115 transitions.
[2020-08-18 20:18:17,656 INFO  L78                 Accepts]: Start accepts. Automaton has 91 states and 115 transitions. Word has length 56
[2020-08-18 20:18:17,656 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 20:18:17,656 INFO  L479      AbstractCegarLoop]: Abstraction has 91 states and 115 transitions.
[2020-08-18 20:18:17,657 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 12 states.
[2020-08-18 20:18:17,657 INFO  L276                IsEmpty]: Start isEmpty. Operand 91 states and 115 transitions.
[2020-08-18 20:18:17,661 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 67
[2020-08-18 20:18:17,661 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:18:17,661 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 20:18:17,661 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2
[2020-08-18 20:18:17,665 INFO  L427      AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:18:17,665 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:18:17,666 INFO  L82        PathProgramCache]: Analyzing trace with hash 487198237, now seen corresponding path program 1 times
[2020-08-18 20:18:17,666 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:18:17,666 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [957999842]
[2020-08-18 20:18:17,666 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:18:17,703 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:17,758 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 20:18:17,759 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:17,779 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5
[2020-08-18 20:18:17,788 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:17,819 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1
[2020-08-18 20:18:17,821 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:17,824 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6
[2020-08-18 20:18:17,826 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:17,829 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21
[2020-08-18 20:18:17,830 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:17,853 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27
[2020-08-18 20:18:17,857 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:17,860 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2
[2020-08-18 20:18:17,861 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:17,862 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8
[2020-08-18 20:18:17,863 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:17,864 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 45
[2020-08-18 20:18:17,865 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:17,878 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51
[2020-08-18 20:18:17,879 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:17,897 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 56
[2020-08-18 20:18:17,899 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:17,906 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 20:18:17,906 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [957999842]
[2020-08-18 20:18:17,906 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 20:18:17,907 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13
[2020-08-18 20:18:17,907 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216202934]
[2020-08-18 20:18:17,907 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 13 states
[2020-08-18 20:18:17,908 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 20:18:17,908 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2020-08-18 20:18:17,908 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156
[2020-08-18 20:18:17,909 INFO  L87              Difference]: Start difference. First operand 91 states and 115 transitions. Second operand 13 states.
[2020-08-18 20:18:18,603 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 20:18:18,603 INFO  L93              Difference]: Finished difference Result 160 states and 205 transitions.
[2020-08-18 20:18:18,606 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. 
[2020-08-18 20:18:18,606 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states. Word has length 66
[2020-08-18 20:18:18,607 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 20:18:18,611 INFO  L225             Difference]: With dead ends: 160
[2020-08-18 20:18:18,612 INFO  L226             Difference]: Without dead ends: 96
[2020-08-18 20:18:18,613 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 20:18:18,614 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 96 states.
[2020-08-18 20:18:18,632 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 93.
[2020-08-18 20:18:18,632 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 93 states.
[2020-08-18 20:18:18,635 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 118 transitions.
[2020-08-18 20:18:18,635 INFO  L78                 Accepts]: Start accepts. Automaton has 93 states and 118 transitions. Word has length 66
[2020-08-18 20:18:18,635 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 20:18:18,635 INFO  L479      AbstractCegarLoop]: Abstraction has 93 states and 118 transitions.
[2020-08-18 20:18:18,636 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 13 states.
[2020-08-18 20:18:18,638 INFO  L276                IsEmpty]: Start isEmpty. Operand 93 states and 118 transitions.
[2020-08-18 20:18:18,640 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 80
[2020-08-18 20:18:18,641 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:18:18,642 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 20:18:18,642 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3
[2020-08-18 20:18:18,642 INFO  L427      AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:18:18,642 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:18:18,642 INFO  L82        PathProgramCache]: Analyzing trace with hash -505239167, now seen corresponding path program 1 times
[2020-08-18 20:18:18,643 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:18:18,643 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [212781545]
[2020-08-18 20:18:18,643 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:18:18,679 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:18,755 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0
[2020-08-18 20:18:18,756 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:18,772 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5
[2020-08-18 20:18:18,781 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:18,813 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1
[2020-08-18 20:18:18,815 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:18,817 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6
[2020-08-18 20:18:18,820 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:18,823 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21
[2020-08-18 20:18:18,828 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:18,836 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2
[2020-08-18 20:18:18,837 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:18,840 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8
[2020-08-18 20:18:18,841 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:18,842 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40
[2020-08-18 20:18:18,845 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:18,849 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2
[2020-08-18 20:18:18,849 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:18,854 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8
[2020-08-18 20:18:18,855 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:18,856 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58
[2020-08-18 20:18:18,859 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:18,870 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64
[2020-08-18 20:18:18,872 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:18,889 INFO  L375   atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 69
[2020-08-18 20:18:18,891 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is unsat
[2020-08-18 20:18:18,926 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 20:18:18,927 INFO  L354   FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [212781545]
[2020-08-18 20:18:18,927 INFO  L220   FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-08-18 20:18:18,927 INFO  L233   FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13
[2020-08-18 20:18:18,927 INFO  L156   tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262761067]
[2020-08-18 20:18:18,929 INFO  L459      AbstractCegarLoop]: Interpolant automaton has 13 states
[2020-08-18 20:18:18,930 INFO  L143   FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-08-18 20:18:18,931 INFO  L142   InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants.
[2020-08-18 20:18:18,932 INFO  L144   InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156
[2020-08-18 20:18:18,932 INFO  L87              Difference]: Start difference. First operand 93 states and 118 transitions. Second operand 13 states.
[2020-08-18 20:18:19,625 INFO  L144             Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-08-18 20:18:19,625 INFO  L93              Difference]: Finished difference Result 148 states and 189 transitions.
[2020-08-18 20:18:19,625 INFO  L141   InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. 
[2020-08-18 20:18:19,626 INFO  L78                 Accepts]: Start accepts. Automaton has 13 states. Word has length 79
[2020-08-18 20:18:19,626 INFO  L84                 Accepts]: Finished accepts. some prefix is accepted.
[2020-08-18 20:18:19,628 INFO  L225             Difference]: With dead ends: 148
[2020-08-18 20:18:19,628 INFO  L226             Difference]: Without dead ends: 96
[2020-08-18 20:18:19,632 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 20:18:19,633 INFO  L82        GeneralOperation]: Start minimizeSevpa. Operand 96 states.
[2020-08-18 20:18:19,658 INFO  L88        GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95.
[2020-08-18 20:18:19,658 INFO  L82        GeneralOperation]: Start removeUnreachable. Operand 95 states.
[2020-08-18 20:18:19,660 INFO  L88        GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 121 transitions.
[2020-08-18 20:18:19,660 INFO  L78                 Accepts]: Start accepts. Automaton has 95 states and 121 transitions. Word has length 79
[2020-08-18 20:18:19,661 INFO  L84                 Accepts]: Finished accepts. word is rejected.
[2020-08-18 20:18:19,661 INFO  L479      AbstractCegarLoop]: Abstraction has 95 states and 121 transitions.
[2020-08-18 20:18:19,661 INFO  L480      AbstractCegarLoop]: Interpolant automaton has 13 states.
[2020-08-18 20:18:19,661 INFO  L276                IsEmpty]: Start isEmpty. Operand 95 states and 121 transitions.
[2020-08-18 20:18:19,664 INFO  L282                IsEmpty]: Finished isEmpty. Found accepting run of length 92
[2020-08-18 20:18:19,664 INFO  L414         BasicCegarLoop]: Found error trace
[2020-08-18 20:18:19,665 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 20:18:19,665 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4
[2020-08-18 20:18:19,665 INFO  L427      AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-08-18 20:18:19,666 INFO  L144       PredicateUnifier]: Initialized classic predicate unifier
[2020-08-18 20:18:19,666 INFO  L82        PathProgramCache]: Analyzing trace with hash -1062270604, now seen corresponding path program 1 times
[2020-08-18 20:18:19,666 INFO  L163   FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-08-18 20:18:19,667 INFO  L354   FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1202234699]
[2020-08-18 20:18:19,667 INFO  L95    rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY
[2020-08-18 20:18:19,727 INFO  L136    AnnotateAndAsserter]: Conjunction of SSA is sat
[2020-08-18 20:18:19,730 INFO  L174   FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace
[2020-08-18 20:18:19,731 INFO  L520         BasicCegarLoop]: Counterexample might be feasible
[2020-08-18 20:18:19,737 WARN  L516      AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5
[2020-08-18 20:18:19,777 INFO  L202        PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 08:18:19 BoogieIcfgContainer
[2020-08-18 20:18:19,777 INFO  L132        PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-08-18 20:18:19,781 INFO  L168              Benchmark]: Toolchain (without parser) took 6487.24 ms. Allocated memory was 140.5 MB in the beginning and 282.6 MB in the end (delta: 142.1 MB). Free memory was 103.0 MB in the beginning and 164.1 MB in the end (delta: -61.2 MB). Peak memory consumption was 80.9 MB. Max. memory is 7.1 GB.
[2020-08-18 20:18:19,783 INFO  L168              Benchmark]: CDTParser took 0.17 ms. Allocated memory is still 140.5 MB. Free memory was 122.0 MB in the beginning and 121.6 MB in the end (delta: 419.4 kB). Peak memory consumption was 419.4 kB. Max. memory is 7.1 GB.
[2020-08-18 20:18:19,789 INFO  L168              Benchmark]: CACSL2BoogieTranslator took 413.96 ms. Allocated memory was 140.5 MB in the beginning and 201.9 MB in the end (delta: 61.3 MB). Free memory was 103.0 MB in the beginning and 177.4 MB in the end (delta: -74.5 MB). Peak memory consumption was 22.0 MB. Max. memory is 7.1 GB.
[2020-08-18 20:18:19,791 INFO  L168              Benchmark]: Boogie Preprocessor took 53.26 ms. Allocated memory is still 201.9 MB. Free memory was 177.4 MB in the beginning and 175.5 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 7.1 GB.
[2020-08-18 20:18:19,792 INFO  L168              Benchmark]: RCFGBuilder took 608.60 ms. Allocated memory is still 201.9 MB. Free memory was 175.5 MB in the beginning and 142.3 MB in the end (delta: 33.2 MB). Peak memory consumption was 33.2 MB. Max. memory is 7.1 GB.
[2020-08-18 20:18:19,793 INFO  L168              Benchmark]: TraceAbstraction took 5406.55 ms. Allocated memory was 201.9 MB in the beginning and 282.6 MB in the end (delta: 80.7 MB). Free memory was 141.4 MB in the beginning and 164.1 MB in the end (delta: -22.8 MB). Peak memory consumption was 58.0 MB. Max. memory is 7.1 GB.
[2020-08-18 20:18:19,805 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 122.0 MB in the beginning and 121.6 MB in the end (delta: 419.4 kB). Peak memory consumption was 419.4 kB. Max. memory is 7.1 GB.
 * CACSL2BoogieTranslator took 413.96 ms. Allocated memory was 140.5 MB in the beginning and 201.9 MB in the end (delta: 61.3 MB). Free memory was 103.0 MB in the beginning and 177.4 MB in the end (delta: -74.5 MB). Peak memory consumption was 22.0 MB. Max. memory is 7.1 GB.
 * Boogie Preprocessor took 53.26 ms. Allocated memory is still 201.9 MB. Free memory was 177.4 MB in the beginning and 175.5 MB in the end (delta: 1.9 MB). Peak memory consumption was 1.9 MB. Max. memory is 7.1 GB.
 * RCFGBuilder took 608.60 ms. Allocated memory is still 201.9 MB. Free memory was 175.5 MB in the beginning and 142.3 MB in the end (delta: 33.2 MB). Peak memory consumption was 33.2 MB. Max. memory is 7.1 GB.
 * TraceAbstraction took 5406.55 ms. Allocated memory was 201.9 MB in the beginning and 282.6 MB in the end (delta: 80.7 MB). Free memory was 141.4 MB in the beginning and 164.1 MB in the end (delta: -22.8 MB). Peak memory consumption was 58.0 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: 
[L96]  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;
[L96]  RET, EXPR    nondet_tree()
[L96]  CALL         task(nondet_tree())
[L74]  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;
[L74]  RET, EXPR    min(t)
[L74]               int a = min(t);
[L75]               int b;
[L77]  CALL, EXPR   size(t)
[L69]  COND FALSE   !(!t)
[L70]  EXPR         t->left
[L70]  CALL, EXPR   size(t->left)
[L69]  COND TRUE    !t
[L69]               return 0;
[L70]  RET, EXPR    size(t->left)
[L70]  EXPR         t->right
[L70]  CALL, EXPR   size(t->right)
[L69]  COND TRUE    !t
[L69]               return 0;
[L70]  RET, EXPR    size(t->right)
[L70]               return size(t->left) + size(t->right) + 1;
[L77]  RET, EXPR    size(t)
[L77]               int n = size(t);
[L78]  CALL         assume_abort_if_not(n != 0)
[L10]  COND FALSE   !(!cond)
[L78]  RET          assume_abort_if_not(n != 0)
[L79]  EXPR, FCALL  calloc(n, sizeof(int))
[L79]               int *x = calloc(n, sizeof(int));
[L80]  CALL         tree_inorder(t, x, n)
[L58]  COND FALSE   !(!t)
[L61]  EXPR         t->left
[L61]  CALL, EXPR   tree_inorder(t->left,  a, i)
[L58]  COND TRUE    !t
[L59]               return i;
[L61]  RET, EXPR    tree_inorder(t->left,  a, i)
[L61]               i = tree_inorder(t->left,  a, i)
[L62]  EXPR         i++
[L62]  EXPR         t->data
[L62]               a[i++] = t->data
[L63]  EXPR         t->right
[L63]  CALL, EXPR   tree_inorder(t->right, a, i)
[L58]  COND TRUE    !t
[L59]               return i;
[L63]  RET, EXPR    tree_inorder(t->right, a, i)
[L63]               i = tree_inorder(t->right, a, i)
[L64]               return i;
[L80]  RET          tree_inorder(t, x, n)
[L81]  EXPR         x[0]
[L81]  CALL         __VERIFIER_assert(a == x[0])
[L14]  COND TRUE    !cond
[L14]               __VERIFIER_error()

  - StatisticsResult: Ultimate Automizer benchmark data
    CFG has 12 procedures, 95 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 5.2s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 3.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 428 SDtfs, 665 SDslu, 1422 SDs, 0 SdLazy, 1860 SolverSat, 705 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 163 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=95occurred 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, 19 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.0s 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...