/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/verifythis/tree_del_rec.c
--------------------------------------------------------------------------------
This is Ultimate 0.1.25-d623d84
[2020-07-21 01:03:01,843 INFO L177 SettingsManager]: Resetting all preferences to default values...
[2020-07-21 01:03:01,849 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values
[2020-07-21 01:03:01,878 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring...
[2020-07-21 01:03:01,879 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values
[2020-07-21 01:03:01,883 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values
[2020-07-21 01:03:01,886 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values
[2020-07-21 01:03:01,902 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values
[2020-07-21 01:03:01,907 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values
[2020-07-21 01:03:01,911 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values
[2020-07-21 01:03:01,915 INFO L181 SettingsManager]: Resetting Sifa preferences to default values
[2020-07-21 01:03:01,918 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring...
[2020-07-21 01:03:01,918 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values
[2020-07-21 01:03:01,923 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values
[2020-07-21 01:03:01,927 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values
[2020-07-21 01:03:01,930 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values
[2020-07-21 01:03:01,934 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values
[2020-07-21 01:03:01,935 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values
[2020-07-21 01:03:01,937 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values
[2020-07-21 01:03:01,945 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values
[2020-07-21 01:03:01,952 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values
[2020-07-21 01:03:01,958 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values
[2020-07-21 01:03:01,960 INFO L181 SettingsManager]: Resetting Referee preferences to default values
[2020-07-21 01:03:01,961 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values
[2020-07-21 01:03:01,965 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring...
[2020-07-21 01:03:01,965 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring...
[2020-07-21 01:03:01,966 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values
[2020-07-21 01:03:01,970 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values
[2020-07-21 01:03:01,971 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values
[2020-07-21 01:03:01,972 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring...
[2020-07-21 01:03:01,972 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values
[2020-07-21 01:03:01,975 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values
[2020-07-21 01:03:01,976 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values
[2020-07-21 01:03:01,978 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values
[2020-07-21 01:03:01,979 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring...
[2020-07-21 01:03:01,980 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values
[2020-07-21 01:03:01,981 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring...
[2020-07-21 01:03:01,981 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring...
[2020-07-21 01:03:01,981 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values
[2020-07-21 01:03:01,982 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values
[2020-07-21 01:03:01,984 INFO L188 SettingsManager]: Finished resetting all preferences to default values...
[2020-07-21 01:03:01,986 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf
[2020-07-21 01:03:02,032 INFO L113 SettingsManager]: Loading preferences was successful
[2020-07-21 01:03:02,033 INFO L115 SettingsManager]: Preferences different from defaults after loading the file:
[2020-07-21 01:03:02,034 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults:
[2020-07-21 01:03:02,038 INFO L138 SettingsManager]: * Create parallel compositions if possible=false
[2020-07-21 01:03:02,038 INFO L138 SettingsManager]: * Use SBE=true
[2020-07-21 01:03:02,038 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults:
[2020-07-21 01:03:02,039 INFO L138 SettingsManager]: * sizeof long=4
[2020-07-21 01:03:02,039 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true
[2020-07-21 01:03:02,042 INFO L138 SettingsManager]: * sizeof POINTER=4
[2020-07-21 01:03:02,042 INFO L138 SettingsManager]: * Check division by zero=IGNORE
[2020-07-21 01:03:02,043 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE
[2020-07-21 01:03:02,043 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE
[2020-07-21 01:03:02,043 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE
[2020-07-21 01:03:02,043 INFO L138 SettingsManager]: * sizeof long double=12
[2020-07-21 01:03:02,043 INFO L138 SettingsManager]: * Check if freed pointer was valid=false
[2020-07-21 01:03:02,044 INFO L138 SettingsManager]: * Use constant arrays=true
[2020-07-21 01:03:02,044 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE
[2020-07-21 01:03:02,044 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults:
[2020-07-21 01:03:02,046 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements
[2020-07-21 01:03:02,046 INFO L138 SettingsManager]: * To the following directory=./dump/
[2020-07-21 01:03:02,046 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode
[2020-07-21 01:03:02,047 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000
[2020-07-21 01:03:02,047 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults:
[2020-07-21 01:03:02,047 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP
[2020-07-21 01:03:02,047 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles
[2020-07-21 01:03:02,047 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL
[2020-07-21 01:03:02,048 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:03:02,048 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true
[2020-07-21 01:03:02,048 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE
[2020-07-21 01:03:02,048 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 -> FPandBPonlyIfFpWasNotPerfect
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS
Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4
[2020-07-21 01:03:02,436 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp
[2020-07-21 01:03:02,463 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized
[2020-07-21 01:03:02,468 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected.
[2020-07-21 01:03:02,474 INFO L271 PluginConnector]: Initializing CDTParser...
[2020-07-21 01:03:02,474 INFO L275 PluginConnector]: CDTParser initialized
[2020-07-21 01:03:02,475 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_del_rec.c
[2020-07-21 01:03:02,597 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/21c765abd/fb8b754be4734075b6fe9de0bccd194a/FLAG479275e58
[2020-07-21 01:03:03,298 INFO L306 CDTParser]: Found 1 translation units.
[2020-07-21 01:03:03,300 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/verifythis/tree_del_rec.c
[2020-07-21 01:03:03,312 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/21c765abd/fb8b754be4734075b6fe9de0bccd194a/FLAG479275e58
[2020-07-21 01:03:03,586 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/21c765abd/fb8b754be4734075b6fe9de0bccd194a
[2020-07-21 01:03:03,600 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] #######################
[2020-07-21 01:03:03,604 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements.
[2020-07-21 01:03:03,606 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator----------------------------
[2020-07-21 01:03:03,606 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator...
[2020-07-21 01:03:03,612 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized
[2020-07-21 01:03:03,613 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:03:03" (1/1) ...
[2020-07-21 01:03:03,619 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1b3607cb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:03, skipping insertion in model container
[2020-07-21 01:03:03,620 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:03:03" (1/1) ...
[2020-07-21 01:03:03,629 INFO L145 MainTranslator]: Starting translation in SV-COMP mode
[2020-07-21 01:03:03,658 INFO L178 MainTranslator]: Built tables and reachable declarations
[2020-07-21 01:03:03,932 WARN L1484 CHandler]: Possible shadowing of function min
[2020-07-21 01:03:03,935 WARN L1484 CHandler]: Possible shadowing of function min
[2020-07-21 01:03:03,956 INFO L206 PostProcessor]: Analyzing one entry point: main
[2020-07-21 01:03:03,977 INFO L203 MainTranslator]: Completed pre-run
[2020-07-21 01:03:04,000 WARN L1484 CHandler]: Possible shadowing of function min
[2020-07-21 01:03:04,003 WARN L1484 CHandler]: Possible shadowing of function min
[2020-07-21 01:03:04,020 INFO L206 PostProcessor]: Analyzing one entry point: main
[2020-07-21 01:03:04,178 INFO L208 MainTranslator]: Completed translation
[2020-07-21 01:03:04,179 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:04 WrapperNode
[2020-07-21 01:03:04,180 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator----------------------------
[2020-07-21 01:03:04,181 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor----------------------------
[2020-07-21 01:03:04,181 INFO L271 PluginConnector]: Initializing Boogie Preprocessor...
[2020-07-21 01:03:04,181 INFO L275 PluginConnector]: Boogie Preprocessor initialized
[2020-07-21 01:03:04,198 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:04" (1/1) ...
[2020-07-21 01:03:04,199 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:04" (1/1) ...
[2020-07-21 01:03:04,218 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:04" (1/1) ...
[2020-07-21 01:03:04,222 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:04" (1/1) ...
[2020-07-21 01:03:04,244 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:04" (1/1) ...
[2020-07-21 01:03:04,254 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:04" (1/1) ...
[2020-07-21 01:03:04,258 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:04" (1/1) ...
[2020-07-21 01:03:04,264 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor----------------------------
[2020-07-21 01:03:04,265 INFO L113 PluginConnector]: ------------------------RCFGBuilder----------------------------
[2020-07-21 01:03:04,265 INFO L271 PluginConnector]: Initializing RCFGBuilder...
[2020-07-21 01:03:04,265 INFO L275 PluginConnector]: RCFGBuilder initialized
[2020-07-21 01:03:04,267 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:04" (1/1) ...
No working directory specified, using /storage/repos/ultimate/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
[2020-07-21 01:03:04,349 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init
[2020-07-21 01:03:04,350 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start
[2020-07-21 01:03:04,350 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_cycle_if_not
[2020-07-21 01:03:04,352 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert
[2020-07-21 01:03:04,352 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree
[2020-07-21 01:03:04,352 INFO L138 BoogieDeclarations]: Found implementation of procedure min
[2020-07-21 01:03:04,354 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_del
[2020-07-21 01:03:04,354 INFO L138 BoogieDeclarations]: Found implementation of procedure tree_inorder
[2020-07-21 01:03:04,354 INFO L138 BoogieDeclarations]: Found implementation of procedure size
[2020-07-21 01:03:04,355 INFO L138 BoogieDeclarations]: Found implementation of procedure task
[2020-07-21 01:03:04,355 INFO L138 BoogieDeclarations]: Found implementation of procedure main
[2020-07-21 01:03:04,359 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit
[2020-07-21 01:03:04,359 INFO L130 BoogieDeclarations]: Found specification of procedure calloc
[2020-07-21 01:03:04,359 INFO L130 BoogieDeclarations]: Found specification of procedure malloc
[2020-07-21 01:03:04,361 INFO L130 BoogieDeclarations]: Found specification of procedure free
[2020-07-21 01:03:04,361 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int
[2020-07-21 01:03:04,361 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool
[2020-07-21 01:03:04,361 INFO L130 BoogieDeclarations]: Found specification of procedure assume_cycle_if_not
[2020-07-21 01:03:04,363 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error
[2020-07-21 01:03:04,364 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert
[2020-07-21 01:03:04,364 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree
[2020-07-21 01:03:04,364 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap
[2020-07-21 01:03:04,364 INFO L130 BoogieDeclarations]: Found specification of procedure write~int
[2020-07-21 01:03:04,364 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$
[2020-07-21 01:03:04,365 INFO L130 BoogieDeclarations]: Found specification of procedure min
[2020-07-21 01:03:04,366 INFO L130 BoogieDeclarations]: Found specification of procedure read~int
[2020-07-21 01:03:04,366 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$
[2020-07-21 01:03:04,366 INFO L130 BoogieDeclarations]: Found specification of procedure tree_del
[2020-07-21 01:03:04,366 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc
[2020-07-21 01:03:04,366 INFO L130 BoogieDeclarations]: Found specification of procedure tree_inorder
[2020-07-21 01:03:04,367 INFO L130 BoogieDeclarations]: Found specification of procedure size
[2020-07-21 01:03:04,367 INFO L130 BoogieDeclarations]: Found specification of procedure task
[2020-07-21 01:03:04,367 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack
[2020-07-21 01:03:04,367 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit
[2020-07-21 01:03:04,367 INFO L130 BoogieDeclarations]: Found specification of procedure main
[2020-07-21 01:03:04,367 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init
[2020-07-21 01:03:04,367 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start
[2020-07-21 01:03:05,124 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start)
[2020-07-21 01:03:05,125 INFO L295 CfgBuilder]: Removed 2 assume(true) statements.
[2020-07-21 01:03:05,134 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:03:05 BoogieIcfgContainer
[2020-07-21 01:03:05,134 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder----------------------------
[2020-07-21 01:03:05,136 INFO L113 PluginConnector]: ------------------------TraceAbstraction----------------------------
[2020-07-21 01:03:05,137 INFO L271 PluginConnector]: Initializing TraceAbstraction...
[2020-07-21 01:03:05,143 INFO L275 PluginConnector]: TraceAbstraction initialized
[2020-07-21 01:03:05,143 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:03:03" (1/3) ...
[2020-07-21 01:03:05,145 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@147df5fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:03:05, skipping insertion in model container
[2020-07-21 01:03:05,145 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:03:04" (2/3) ...
[2020-07-21 01:03:05,146 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@147df5fa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:03:05, skipping insertion in model container
[2020-07-21 01:03:05,146 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:03:05" (3/3) ...
[2020-07-21 01:03:05,149 INFO L109 eAbstractionObserver]: Analyzing ICFG tree_del_rec.c
[2020-07-21 01:03:05,166 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION
[2020-07-21 01:03:05,180 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations.
[2020-07-21 01:03:05,206 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations.
[2020-07-21 01:03:05,247 INFO L375 AbstractCegarLoop]: Interprodecural is true
[2020-07-21 01:03:05,248 INFO L376 AbstractCegarLoop]: Hoare is true
[2020-07-21 01:03:05,248 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect
[2020-07-21 01:03:05,248 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE
[2020-07-21 01:03:05,248 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION
[2020-07-21 01:03:05,249 INFO L380 AbstractCegarLoop]: Difference is false
[2020-07-21 01:03:05,249 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA
[2020-07-21 01:03:05,249 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce========
[2020-07-21 01:03:05,283 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states.
[2020-07-21 01:03:05,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45
[2020-07-21 01:03:05,300 INFO L414 BasicCegarLoop]: Found error trace
[2020-07-21 01:03:05,302 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]
[2020-07-21 01:03:05,303 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 01:03:05,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 01:03:05,313 INFO L82 PathProgramCache]: Analyzing trace with hash -1057238675, now seen corresponding path program 1 times
[2020-07-21 01:03:05,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 01:03:05,331 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [534825979]
[2020-07-21 01:03:05,331 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:03:05,514 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s)
[2020-07-21 01:03:05,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 01:03:05,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 11 conjunts are in the unsatisfiable core
[2020-07-21 01:03:05,531 INFO L286 TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 01:03:05,658 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked.
[2020-07-21 01:03:05,659 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-21 01:03:05,661 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [534825979]
[2020-07-21 01:03:05,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-21 01:03:05,664 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7
[2020-07-21 01:03:05,666 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676979570]
[2020-07-21 01:03:05,675 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states
[2020-07-21 01:03:05,677 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 01:03:05,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants.
[2020-07-21 01:03:05,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42
[2020-07-21 01:03:05,704 INFO L87 Difference]: Start difference. First operand 97 states. Second operand 7 states.
[2020-07-21 01:03:05,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 01:03:05,867 INFO L93 Difference]: Finished difference Result 165 states and 216 transitions.
[2020-07-21 01:03:05,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states.
[2020-07-21 01:03:05,871 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 44
[2020-07-21 01:03:05,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 01:03:05,891 INFO L225 Difference]: With dead ends: 165
[2020-07-21 01:03:05,892 INFO L226 Difference]: Without dead ends: 90
[2020-07-21 01:03:05,899 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56
[2020-07-21 01:03:05,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states.
[2020-07-21 01:03:05,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90.
[2020-07-21 01:03:05,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states.
[2020-07-21 01:03:05,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 114 transitions.
[2020-07-21 01:03:05,998 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 114 transitions. Word has length 44
[2020-07-21 01:03:05,999 INFO L84 Accepts]: Finished accepts. word is rejected.
[2020-07-21 01:03:05,999 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 114 transitions.
[2020-07-21 01:03:05,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states.
[2020-07-21 01:03:06,000 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 114 transitions.
[2020-07-21 01:03:06,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57
[2020-07-21 01:03:06,005 INFO L414 BasicCegarLoop]: Found error trace
[2020-07-21 01:03:06,005 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]
[2020-07-21 01:03:06,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:03:06,209 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 01:03:06,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 01:03:06,210 INFO L82 PathProgramCache]: Analyzing trace with hash 1861604494, now seen corresponding path program 1 times
[2020-07-21 01:03:06,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 01:03:06,212 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1431060127]
[2020-07-21 01:03:06,212 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:03:06,366 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-21 01:03:06,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 01:03:06,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 25 conjunts are in the unsatisfiable core
[2020-07-21 01:03:06,387 INFO L286 TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 01:03:06,524 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2020-07-21 01:03:06,525 INFO L328 TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 01:03:06,695 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked.
[2020-07-21 01:03:06,695 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1431060127]
[2020-07-21 01:03:06,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 01:03:06,696 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9
[2020-07-21 01:03:06,696 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926652550]
[2020-07-21 01:03:06,699 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states
[2020-07-21 01:03:06,699 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 01:03:06,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants.
[2020-07-21 01:03:06,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72
[2020-07-21 01:03:06,700 INFO L87 Difference]: Start difference. First operand 90 states and 114 transitions. Second operand 9 states.
[2020-07-21 01:03:06,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 01:03:06,855 INFO L93 Difference]: Finished difference Result 159 states and 202 transitions.
[2020-07-21 01:03:06,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states.
[2020-07-21 01:03:06,856 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 56
[2020-07-21 01:03:06,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 01:03:06,859 INFO L225 Difference]: With dead ends: 159
[2020-07-21 01:03:06,859 INFO L226 Difference]: Without dead ends: 92
[2020-07-21 01:03:06,862 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 104 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110
[2020-07-21 01:03:06,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states.
[2020-07-21 01:03:06,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92.
[2020-07-21 01:03:06,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states.
[2020-07-21 01:03:06,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 117 transitions.
[2020-07-21 01:03:06,884 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 117 transitions. Word has length 56
[2020-07-21 01:03:06,884 INFO L84 Accepts]: Finished accepts. word is rejected.
[2020-07-21 01:03:06,885 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 117 transitions.
[2020-07-21 01:03:06,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states.
[2020-07-21 01:03:06,885 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 117 transitions.
[2020-07-21 01:03:06,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67
[2020-07-21 01:03:06,890 INFO L414 BasicCegarLoop]: Found error trace
[2020-07-21 01:03:06,890 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]
[2020-07-21 01:03:07,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:03:07,092 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 01:03:07,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 01:03:07,093 INFO L82 PathProgramCache]: Analyzing trace with hash 1883823467, now seen corresponding path program 1 times
[2020-07-21 01:03:07,093 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 01:03:07,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [910493207]
[2020-07-21 01:03:07,094 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:03:07,219 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s)
[2020-07-21 01:03:07,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 01:03:07,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 17 conjunts are in the unsatisfiable core
[2020-07-21 01:03:07,227 INFO L286 TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 01:03:07,324 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked.
[2020-07-21 01:03:07,324 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect
[2020-07-21 01:03:07,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [910493207]
[2020-07-21 01:03:07,326 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences.
[2020-07-21 01:03:07,326 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9
[2020-07-21 01:03:07,327 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [921547653]
[2020-07-21 01:03:07,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states
[2020-07-21 01:03:07,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 01:03:07,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants.
[2020-07-21 01:03:07,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72
[2020-07-21 01:03:07,330 INFO L87 Difference]: Start difference. First operand 92 states and 117 transitions. Second operand 9 states.
[2020-07-21 01:03:07,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 01:03:07,580 INFO L93 Difference]: Finished difference Result 158 states and 201 transitions.
[2020-07-21 01:03:07,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states.
[2020-07-21 01:03:07,581 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 66
[2020-07-21 01:03:07,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 01:03:07,613 INFO L225 Difference]: With dead ends: 158
[2020-07-21 01:03:07,613 INFO L226 Difference]: Without dead ends: 94
[2020-07-21 01:03:07,615 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=105, Unknown=0, NotChecked=0, Total=132
[2020-07-21 01:03:07,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states.
[2020-07-21 01:03:07,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94.
[2020-07-21 01:03:07,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states.
[2020-07-21 01:03:07,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 120 transitions.
[2020-07-21 01:03:07,640 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 120 transitions. Word has length 66
[2020-07-21 01:03:07,640 INFO L84 Accepts]: Finished accepts. word is rejected.
[2020-07-21 01:03:07,641 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 120 transitions.
[2020-07-21 01:03:07,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states.
[2020-07-21 01:03:07,641 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 120 transitions.
[2020-07-21 01:03:07,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80
[2020-07-21 01:03:07,644 INFO L414 BasicCegarLoop]: Found error trace
[2020-07-21 01:03:07,644 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]
[2020-07-21 01:03:07,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:03:07,860 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 01:03:07,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 01:03:07,861 INFO L82 PathProgramCache]: Analyzing trace with hash 1030140767, now seen corresponding path program 1 times
[2020-07-21 01:03:07,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 01:03:07,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1109890184]
[2020-07-21 01:03:07,862 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:03:08,053 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-21 01:03:08,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat
[2020-07-21 01:03:08,059 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 39 conjunts are in the unsatisfiable core
[2020-07-21 01:03:08,065 INFO L286 TraceCheckSpWp]: Computing forward predicates...
[2020-07-21 01:03:08,218 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked.
[2020-07-21 01:03:08,219 INFO L328 TraceCheckSpWp]: Computing backward predicates...
[2020-07-21 01:03:08,631 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked.
[2020-07-21 01:03:08,632 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1109890184]
[2020-07-21 01:03:08,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences.
[2020-07-21 01:03:08,633 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 18
[2020-07-21 01:03:08,633 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161182056]
[2020-07-21 01:03:08,634 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states
[2020-07-21 01:03:08,634 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES
[2020-07-21 01:03:08,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants.
[2020-07-21 01:03:08,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=264, Unknown=0, NotChecked=0, Total=306
[2020-07-21 01:03:08,636 INFO L87 Difference]: Start difference. First operand 94 states and 120 transitions. Second operand 18 states.
[2020-07-21 01:03:09,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization.
[2020-07-21 01:03:09,067 INFO L93 Difference]: Finished difference Result 148 states and 190 transitions.
[2020-07-21 01:03:09,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states.
[2020-07-21 01:03:09,068 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 79
[2020-07-21 01:03:09,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted.
[2020-07-21 01:03:09,075 INFO L225 Difference]: With dead ends: 148
[2020-07-21 01:03:09,076 INFO L226 Difference]: Without dead ends: 96
[2020-07-21 01:03:09,082 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 142 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=71, Invalid=435, Unknown=0, NotChecked=0, Total=506
[2020-07-21 01:03:09,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states.
[2020-07-21 01:03:09,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96.
[2020-07-21 01:03:09,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states.
[2020-07-21 01:03:09,119 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 123 transitions.
[2020-07-21 01:03:09,120 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 123 transitions. Word has length 79
[2020-07-21 01:03:09,122 INFO L84 Accepts]: Finished accepts. word is rejected.
[2020-07-21 01:03:09,123 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 123 transitions.
[2020-07-21 01:03:09,123 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states.
[2020-07-21 01:03:09,123 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 123 transitions.
[2020-07-21 01:03:09,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92
[2020-07-21 01:03:09,135 INFO L414 BasicCegarLoop]: Found error trace
[2020-07-21 01:03:09,135 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]
[2020-07-21 01:03:09,352 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:03:09,353 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]===
[2020-07-21 01:03:09,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier
[2020-07-21 01:03:09,354 INFO L82 PathProgramCache]: Analyzing trace with hash -299285422, now seen corresponding path program 1 times
[2020-07-21 01:03:09,354 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES
[2020-07-21 01:03:09,355 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [294423526]
[2020-07-21 01:03:09,355 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions)
No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3
Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null)
Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:03:09,573 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s)
[2020-07-21 01:03:09,573 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat
[2020-07-21 01:03:09,574 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders.
[2020-07-21 01:03:09,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat
[2020-07-21 01:03:09,649 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders.
[2020-07-21 01:03:09,729 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace
[2020-07-21 01:03:09,730 INFO L520 BasicCegarLoop]: Counterexample might be feasible
[2020-07-21 01:03:09,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in
[2020-07-21 01:03:10,021 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:03:10 BoogieIcfgContainer
[2020-07-21 01:03:10,022 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction----------------------------
[2020-07-21 01:03:10,028 INFO L168 Benchmark]: Toolchain (without parser) took 6422.10 ms. Allocated memory was 143.7 MB in the beginning and 249.6 MB in the end (delta: 105.9 MB). Free memory was 101.3 MB in the beginning and 141.2 MB in the end (delta: -39.9 MB). Peak memory consumption was 66.1 MB. Max. memory is 7.1 GB.
[2020-07-21 01:03:10,030 INFO L168 Benchmark]: CDTParser took 0.93 ms. Allocated memory is still 143.7 MB. Free memory was 119.8 MB in the beginning and 119.6 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB.
[2020-07-21 01:03:10,036 INFO L168 Benchmark]: CACSL2BoogieTranslator took 574.57 ms. Allocated memory was 143.7 MB in the beginning and 202.9 MB in the end (delta: 59.2 MB). Free memory was 100.9 MB in the beginning and 180.9 MB in the end (delta: -80.0 MB). Peak memory consumption was 21.3 MB. Max. memory is 7.1 GB.
[2020-07-21 01:03:10,037 INFO L168 Benchmark]: Boogie Preprocessor took 83.39 ms. Allocated memory is still 202.9 MB. Free memory was 180.9 MB in the beginning and 177.7 MB in the end (delta: 3.2 MB). Peak memory consumption was 3.2 MB. Max. memory is 7.1 GB.
[2020-07-21 01:03:10,038 INFO L168 Benchmark]: RCFGBuilder took 869.50 ms. Allocated memory is still 202.9 MB. Free memory was 177.7 MB in the beginning and 143.5 MB in the end (delta: 34.2 MB). Peak memory consumption was 34.2 MB. Max. memory is 7.1 GB.
[2020-07-21 01:03:10,039 INFO L168 Benchmark]: TraceAbstraction took 4885.86 ms. Allocated memory was 202.9 MB in the beginning and 249.6 MB in the end (delta: 46.7 MB). Free memory was 143.5 MB in the beginning and 141.2 MB in the end (delta: 2.3 MB). Peak memory consumption was 49.0 MB. Max. memory is 7.1 GB.
[2020-07-21 01:03:10,044 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] #######################
--- Results ---
* Results from de.uni_freiburg.informatik.ultimate.core:
- StatisticsResult: Toolchain Benchmarks
Benchmark results are:
* CDTParser took 0.93 ms. Allocated memory is still 143.7 MB. Free memory was 119.8 MB in the beginning and 119.6 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB.
* CACSL2BoogieTranslator took 574.57 ms. Allocated memory was 143.7 MB in the beginning and 202.9 MB in the end (delta: 59.2 MB). Free memory was 100.9 MB in the beginning and 180.9 MB in the end (delta: -80.0 MB). Peak memory consumption was 21.3 MB. Max. memory is 7.1 GB.
* Boogie Preprocessor took 83.39 ms. Allocated memory is still 202.9 MB. Free memory was 180.9 MB in the beginning and 177.7 MB in the end (delta: 3.2 MB). Peak memory consumption was 3.2 MB. Max. memory is 7.1 GB.
* RCFGBuilder took 869.50 ms. Allocated memory is still 202.9 MB. Free memory was 177.7 MB in the beginning and 143.5 MB in the end (delta: 34.2 MB). Peak memory consumption was 34.2 MB. Max. memory is 7.1 GB.
* TraceAbstraction took 4885.86 ms. Allocated memory was 202.9 MB in the beginning and 249.6 MB in the end (delta: 46.7 MB). Free memory was 143.5 MB in the beginning and 141.2 MB in the end (delta: 2.3 MB). Peak memory consumption was 49.0 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:
[L100] 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;
VAL [\result={0:0}]
[L28] RET, EXPR nondet_tree()
VAL [malloc(sizeof(struct node))={-1:0}, n={-1:0}, nondet_tree()={0:0}]
[L28] n->left = nondet_tree()
[L29] CALL, EXPR nondet_tree()
[L23] COND TRUE __VERIFIER_nondet_bool()
[L24] return 0;
VAL [\result={0:0}]
[L29] RET, EXPR nondet_tree()
VAL [malloc(sizeof(struct node))={-1:0}, n={-1:0}, nondet_tree()={0:0}]
[L29] n->right = nondet_tree()
[L30] return n;
VAL [\result={-1:0}, malloc(sizeof(struct node))={-1:0}, n={-1:0}]
[L100] RET, EXPR nondet_tree()
VAL [nondet_tree()={-1:0}]
[L100] CALL task(nondet_tree())
VAL [t={-1:0}]
[L76] CALL, EXPR min(t)
VAL [n={-1:0}]
[L35] COND FALSE !(!n)
[L38] EXPR n->data
[L38] int a = n->data;
[L39] EXPR n->left
VAL [a=2147483647, n={-1:0}, n={-1:0}, n->left={0:0}]
[L39] CALL, EXPR min(n->left)
VAL [n={0:0}]
[L35] COND TRUE !n
[L36] return 2147483647;
VAL [\result=2147483647, n={0:0}, n={0:0}]
[L39] RET, EXPR min(n->left)
VAL [a=2147483647, min(n->left)=2147483647, n={-1:0}, n={-1:0}, n->left={0:0}]
[L39] int b = min(n->left);
[L40] EXPR n->right
VAL [a=2147483647, b=2147483647, n={-1:0}, n={-1:0}, n->right={0:0}]
[L40] CALL, EXPR min(n->right)
VAL [n={0:0}]
[L35] COND TRUE !n
[L36] return 2147483647;
VAL [\result=2147483647, n={0:0}, n={0:0}]
[L40] RET, EXPR min(n->right)
VAL [a=2147483647, b=2147483647, min(n->right)=2147483647, n={-1:0}, n={-1:0}, n->right={0:0}]
[L40] int c = min(n->right);
[L41] COND TRUE b <= a && b <= c
[L41] return b;
VAL [\result=2147483647, a=2147483647, b=2147483647, c=2147483647, n={-1:0}, n={-1:0}]
[L76] RET, EXPR min(t)
VAL [min(t)=2147483647, t={-1:0}, t={-1:0}]
[L76] int a = min(t);
[L77] int b;
VAL [a=2147483647, b={29536:0}, t={-1:0}, t={-1:0}]
[L79] CALL, EXPR size(t)
VAL [t={-1:0}]
[L71] COND FALSE !(!t)
[L72] EXPR t->left
VAL [t={-1:0}, t={-1:0}, t->left={0:0}]
[L72] CALL, EXPR size(t->left)
VAL [t={0:0}]
[L71] COND TRUE !t
[L71] return 0;
VAL [\result=0, t={0:0}, t={0:0}]
[L72] RET, EXPR size(t->left)
VAL [size(t->left)=0, t={-1:0}, t={-1:0}, t->left={0:0}]
[L72] EXPR t->right
VAL [size(t->left)=0, t={-1:0}, t={-1:0}, t->left={0:0}, t->right={0:0}]
[L72] CALL, EXPR size(t->right)
VAL [t={0:0}]
[L71] COND TRUE !t
[L71] return 0;
VAL [\result=0, t={0:0}, t={0:0}]
[L72] RET, EXPR size(t->right)
VAL [size(t->left)=0, size(t->right)=0, t={-1:0}, t={-1:0}, t->left={0:0}, t->right={0:0}]
[L72] return size(t->left) + size(t->right) + 1;
[L79] RET, EXPR size(t)
VAL [a=2147483647, b={29536:0}, size(t)=1, t={-1:0}, t={-1:0}]
[L79] int n = size(t);
[L80] CALL assume_cycle_if_not(n != 0)
VAL [\old(cond)=1]
[L9] COND FALSE !(!cond)
VAL [\old(cond)=1, cond=1]
[L80] RET assume_cycle_if_not(n != 0)
VAL [a=2147483647, b={29536:0}, n=1, t={-1:0}, t={-1:0}]
[L81] EXPR, FCALL calloc(n, sizeof(int))
VAL [a=2147483647, b={29536:0}, calloc(n, sizeof(int))={29534:0}, n=1, t={-1:0}, t={-1:0}]
[L81] int *x = calloc(n, sizeof(int));
VAL [a=2147483647, b={29536:0}, calloc(n, sizeof(int))={29534:0}, n=1, t={-1:0}, t={-1:0}, x={29534:0}]
[L82] CALL tree_inorder(t, x, n)
VAL [\old(i)=1, a={29534:0}, t={-1:0}]
[L60] COND FALSE !(!t)
[L63] EXPR t->left
VAL [\old(i)=1, a={29534:0}, a={29534:0}, i=1, t={-1:0}, t={-1:0}, t->left={0:0}]
[L63] CALL, EXPR tree_inorder(t->left, a, i)
VAL [\old(i)=1, a={29534:0}, t={0:0}]
[L60] COND TRUE !t
[L61] return i;
VAL [\old(i)=1, \result=1, a={29534:0}, a={29534:0}, i=1, t={0:0}, t={0:0}]
[L63] RET, EXPR tree_inorder(t->left, a, i)
VAL [\old(i)=1, a={29534:0}, a={29534:0}, i=1, t={-1:0}, t={-1:0}, t->left={0:0}, tree_inorder(t->left, a, i)=1]
[L63] i = tree_inorder(t->left, a, i)
[L64] EXPR i++
[L64] EXPR t->data
[L64] a[i++] = t->data
[L65] EXPR t->right
VAL [\old(i)=1, a={29534:0}, a={29534:0}, i=2, t={-1:0}, t={-1:0}, t->right={0:0}]
[L65] CALL, EXPR tree_inorder(t->right, a, i)
VAL [\old(i)=2, a={29534:0}, t={0:0}]
[L60] COND TRUE !t
[L61] return i;
VAL [\old(i)=2, \result=2, a={29534:0}, a={29534:0}, i=2, t={0:0}, t={0:0}]
[L65] RET, EXPR tree_inorder(t->right, a, i)
VAL [\old(i)=1, a={29534:0}, a={29534:0}, i=2, t={-1:0}, t={-1:0}, t->right={0:0}, tree_inorder(t->right, a, i)=2]
[L65] i = tree_inorder(t->right, a, i)
[L66] return i;
VAL [\old(i)=1, \result=2, a={29534:0}, a={29534:0}, i=2, t={-1:0}, t={-1:0}]
[L82] RET tree_inorder(t, x, n)
VAL [a=2147483647, b={29536:0}, calloc(n, sizeof(int))={29534:0}, n=1, t={-1:0}, t={-1:0}, tree_inorder(t, x, n)=2, x={29534:0}]
[L83] EXPR x[0]
VAL [a=2147483647, b={29536:0}, calloc(n, sizeof(int))={29534:0}, n=1, t={-1:0}, t={-1:0}, x={29534:0}, x[0]=0]
[L83] CALL __VERIFIER_assert(a == x[0])
VAL [\old(cond)=0]
[L14] COND TRUE !cond
VAL [\old(cond)=0, cond=0]
[L14] __VERIFIER_error()
VAL [\old(cond)=0, cond=0]
- StatisticsResult: Ultimate Automizer benchmark data
CFG has 12 procedures, 97 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.7s, OverallIterations: 5, TraceHistogramMax: 3, AutomataDifference: 1.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 422 SDtfs, 153 SDslu, 2657 SDs, 0 SdLazy, 387 SolverSat, 99 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 391 GetRequests, 343 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=97occurred 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, 4 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 1.1s InterpolantComputationTime, 336 NumberOfCodeBlocks, 265 NumberOfCodeBlocksAsserted, 15 NumberOfCheckSat, 374 ConstructedInterpolants, 0 QuantifiedInterpolants, 58382 SizeOfPredicates, 23 NumberOfNonLiveVariables, 886 ConjunctsInSsa, 92 ConjunctsInUnsatCore, 6 InterpolantComputations, 2 PerfectInterpolantSequences, 103/111 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...