./Ultimate.py --spec ../sv-benchmarks/c/properties/unreach-call.prp --file ../sv-benchmarks/c/verifythis/tree_max_incorrect.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9a8b2e8d Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/config -Xmx15G -Xms4m -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/AutomizerReach.xml -i ../sv-benchmarks/c/verifythis/tree_max_incorrect.c -s /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash fdb95a531f91b891105aa672579f7a5a4ed687cf .................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.1.25-9a8b2e8 [2020-10-20 01:48:59,876 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-20 01:48:59,878 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-20 01:48:59,917 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-20 01:48:59,917 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-20 01:48:59,927 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-20 01:48:59,928 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-20 01:48:59,930 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-20 01:48:59,933 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-20 01:48:59,934 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-20 01:48:59,935 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-20 01:48:59,937 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-20 01:48:59,938 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-20 01:48:59,941 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-20 01:48:59,942 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-20 01:48:59,944 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-20 01:48:59,945 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-20 01:48:59,948 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-20 01:48:59,950 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-20 01:48:59,953 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-20 01:48:59,955 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-20 01:48:59,957 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-20 01:48:59,959 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-20 01:48:59,960 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-20 01:48:59,964 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-10-20 01:48:59,971 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-10-20 01:48:59,971 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-10-20 01:48:59,972 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-10-20 01:48:59,973 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-10-20 01:48:59,973 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-10-20 01:48:59,976 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-10-20 01:48:59,977 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-10-20 01:48:59,977 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-10-20 01:48:59,978 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-10-20 01:48:59,980 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-10-20 01:48:59,980 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-10-20 01:48:59,981 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-10-20 01:48:59,981 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-10-20 01:48:59,982 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-20 01:48:59,982 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-20 01:48:59,983 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-20 01:48:59,984 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-10-20 01:49:00,022 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-20 01:49:00,025 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-20 01:49:00,027 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-20 01:49:00,027 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-20 01:49:00,027 INFO L138 SettingsManager]: * Use SBE=true [2020-10-20 01:49:00,028 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-20 01:49:00,028 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-20 01:49:00,028 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-20 01:49:00,028 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-20 01:49:00,029 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-20 01:49:00,030 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-20 01:49:00,030 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-20 01:49:00,030 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-20 01:49:00,031 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-20 01:49:00,031 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-20 01:49:00,031 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-20 01:49:00,032 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-20 01:49:00,032 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-20 01:49:00,040 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-20 01:49:00,040 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-20 01:49:00,040 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-20 01:49:00,041 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-20 01:49:00,041 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-20 01:49:00,041 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-20 01:49:00,041 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-20 01:49:00,041 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-20 01:49:00,042 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-20 01:49:00,042 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-20 01:49:00,042 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-20 01:49:00,042 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fdb95a531f91b891105aa672579f7a5a4ed687cf [2020-10-20 01:49:00,220 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-20 01:49:00,232 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-20 01:49:00,235 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-20 01:49:00,236 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-20 01:49:00,237 INFO L275 PluginConnector]: CDTParser initialized [2020-10-20 01:49:00,237 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/verifythis/tree_max_incorrect.c [2020-10-20 01:49:00,297 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8d05ab8e9/1849c6bd325749d58764e92668097583/FLAGe0022f25e [2020-10-20 01:49:00,719 INFO L306 CDTParser]: Found 1 translation units. [2020-10-20 01:49:00,719 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/verifythis/tree_max_incorrect.c [2020-10-20 01:49:00,725 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8d05ab8e9/1849c6bd325749d58764e92668097583/FLAGe0022f25e [2020-10-20 01:49:01,103 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8d05ab8e9/1849c6bd325749d58764e92668097583 [2020-10-20 01:49:01,107 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-20 01:49:01,113 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-10-20 01:49:01,114 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-20 01:49:01,114 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-20 01:49:01,118 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-20 01:49:01,128 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 01:49:01" (1/1) ... [2020-10-20 01:49:01,131 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@34da27b4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 01:49:01, skipping insertion in model container [2020-10-20 01:49:01,131 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.10 01:49:01" (1/1) ... [2020-10-20 01:49:01,139 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-20 01:49:01,158 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-20 01:49:01,372 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-20 01:49:01,382 INFO L203 MainTranslator]: Completed pre-run [2020-10-20 01:49:01,402 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-20 01:49:01,421 INFO L208 MainTranslator]: Completed translation [2020-10-20 01:49:01,422 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 01:49:01 WrapperNode [2020-10-20 01:49:01,422 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-20 01:49:01,423 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-10-20 01:49:01,423 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-10-20 01:49:01,423 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-10-20 01:49:01,429 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 01:49:01" (1/1) ... [2020-10-20 01:49:01,438 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 01:49:01" (1/1) ... [2020-10-20 01:49:01,454 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-10-20 01:49:01,454 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-20 01:49:01,455 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-20 01:49:01,455 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-20 01:49:01,462 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 01:49:01" (1/1) ... [2020-10-20 01:49:01,462 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 01:49:01" (1/1) ... [2020-10-20 01:49:01,465 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 01:49:01" (1/1) ... [2020-10-20 01:49:01,465 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 01:49:01" (1/1) ... [2020-10-20 01:49:01,473 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 01:49:01" (1/1) ... [2020-10-20 01:49:01,475 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 01:49:01" (1/1) ... [2020-10-20 01:49:01,477 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 01:49:01" (1/1) ... [2020-10-20 01:49:01,479 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-20 01:49:01,480 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-20 01:49:01,480 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-20 01:49:01,480 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-20 01:49:01,481 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 01:49:01" (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 [2020-10-20 01:49:01,550 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-10-20 01:49:01,550 INFO L130 BoogieDeclarations]: Found specification of procedure max [2020-10-20 01:49:01,550 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2020-10-20 01:49:01,551 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2020-10-20 01:49:01,551 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2020-10-20 01:49:01,552 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-20 01:49:01,552 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-10-20 01:49:01,552 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-10-20 01:49:01,552 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-10-20 01:49:01,553 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-20 01:49:01,553 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-20 01:49:01,553 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-10-20 01:49:01,553 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-20 01:49:01,554 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-20 01:49:01,554 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-20 01:49:01,918 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-20 01:49:01,919 INFO L298 CfgBuilder]: Removed 10 assume(true) statements. [2020-10-20 01:49:01,920 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 01:49:01 BoogieIcfgContainer [2020-10-20 01:49:01,921 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-20 01:49:01,922 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-20 01:49:01,922 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-20 01:49:01,925 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-20 01:49:01,926 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.10 01:49:01" (1/3) ... [2020-10-20 01:49:01,927 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6af85c17 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.10 01:49:01, skipping insertion in model container [2020-10-20 01:49:01,927 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.10 01:49:01" (2/3) ... [2020-10-20 01:49:01,927 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6af85c17 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.10 01:49:01, skipping insertion in model container [2020-10-20 01:49:01,928 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 01:49:01" (3/3) ... [2020-10-20 01:49:01,929 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_max_incorrect.c [2020-10-20 01:49:01,940 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-20 01:49:01,947 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-20 01:49:01,960 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-20 01:49:01,982 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-20 01:49:01,982 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-20 01:49:01,982 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-20 01:49:01,982 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-20 01:49:01,983 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-20 01:49:01,983 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-20 01:49:01,983 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-20 01:49:01,983 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-20 01:49:02,002 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2020-10-20 01:49:02,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-10-20 01:49:02,009 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 01:49:02,010 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-20 01:49:02,010 INFO L429 AbstractCegarLoop]: === Iteration 1 === [checkErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 01:49:02,016 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 01:49:02,017 INFO L82 PathProgramCache]: Analyzing trace with hash -21493180, now seen corresponding path program 1 times [2020-10-20 01:49:02,024 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 01:49:02,025 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1893394703] [2020-10-20 01:49:02,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 01:49:02,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 01:49:02,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-20 01:49:02,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 01:49:02,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-10-20 01:49:02,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 01:49:02,365 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-20 01:49:02,366 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1893394703] [2020-10-20 01:49:02,367 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-20 01:49:02,367 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-10-20 01:49:02,368 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1400749191] [2020-10-20 01:49:02,373 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-20 01:49:02,373 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 01:49:02,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-20 01:49:02,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-10-20 01:49:02,391 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 8 states. [2020-10-20 01:49:02,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 01:49:02,785 INFO L93 Difference]: Finished difference Result 74 states and 97 transitions. [2020-10-20 01:49:02,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-20 01:49:02,787 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-10-20 01:49:02,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 01:49:02,799 INFO L225 Difference]: With dead ends: 74 [2020-10-20 01:49:02,799 INFO L226 Difference]: Without dead ends: 34 [2020-10-20 01:49:02,804 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2020-10-20 01:49:02,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-10-20 01:49:02,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-10-20 01:49:02,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-10-20 01:49:02,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 43 transitions. [2020-10-20 01:49:02,852 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 43 transitions. Word has length 18 [2020-10-20 01:49:02,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 01:49:02,852 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 43 transitions. [2020-10-20 01:49:02,853 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-20 01:49:02,853 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 43 transitions. [2020-10-20 01:49:02,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-10-20 01:49:02,856 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 01:49:02,856 INFO L422 BasicCegarLoop]: trace histogram [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] [2020-10-20 01:49:02,856 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-20 01:49:02,857 INFO L429 AbstractCegarLoop]: === Iteration 2 === [checkErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 01:49:02,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 01:49:02,857 INFO L82 PathProgramCache]: Analyzing trace with hash 1041522055, now seen corresponding path program 1 times [2020-10-20 01:49:02,858 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 01:49:02,858 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [498456859] [2020-10-20 01:49:02,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 01:49:02,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 01:49:02,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-20 01:49:02,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 01:49:03,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-10-20 01:49:03,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 01:49:03,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-20 01:49:03,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 01:49:03,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-10-20 01:49:03,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-20 01:49:03,088 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-10-20 01:49:03,089 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [498456859] [2020-10-20 01:49:03,089 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-20 01:49:03,089 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-10-20 01:49:03,089 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216881127] [2020-10-20 01:49:03,091 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-10-20 01:49:03,091 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-20 01:49:03,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-10-20 01:49:03,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-10-20 01:49:03,092 INFO L87 Difference]: Start difference. First operand 34 states and 43 transitions. Second operand 9 states. [2020-10-20 01:49:03,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-20 01:49:03,324 INFO L93 Difference]: Finished difference Result 47 states and 59 transitions. [2020-10-20 01:49:03,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-20 01:49:03,325 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-10-20 01:49:03,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-20 01:49:03,327 INFO L225 Difference]: With dead ends: 47 [2020-10-20 01:49:03,327 INFO L226 Difference]: Without dead ends: 36 [2020-10-20 01:49:03,329 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-10-20 01:49:03,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-10-20 01:49:03,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-10-20 01:49:03,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-10-20 01:49:03,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 46 transitions. [2020-10-20 01:49:03,340 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 46 transitions. Word has length 28 [2020-10-20 01:49:03,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-20 01:49:03,340 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 46 transitions. [2020-10-20 01:49:03,341 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-10-20 01:49:03,341 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 46 transitions. [2020-10-20 01:49:03,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-10-20 01:49:03,343 INFO L414 BasicCegarLoop]: Found error trace [2020-10-20 01:49:03,343 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] [2020-10-20 01:49:03,343 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-20 01:49:03,344 INFO L429 AbstractCegarLoop]: === Iteration 3 === [checkErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-20 01:49:03,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-20 01:49:03,344 INFO L82 PathProgramCache]: Analyzing trace with hash 1590309937, now seen corresponding path program 1 times [2020-10-20 01:49:03,344 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-20 01:49:03,345 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [806874725] [2020-10-20 01:49:03,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-20 01:49:03,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 01:49:03,422 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 01:49:03,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-20 01:49:03,458 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-20 01:49:03,489 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-20 01:49:03,489 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-20 01:49:03,490 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-20 01:49:03,547 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.10 01:49:03 BoogieIcfgContainer [2020-10-20 01:49:03,547 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-20 01:49:03,547 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-10-20 01:49:03,547 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-10-20 01:49:03,548 INFO L275 PluginConnector]: Witness Printer initialized [2020-10-20 01:49:03,548 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.10 01:49:01" (3/4) ... [2020-10-20 01:49:03,550 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-10-20 01:49:03,635 INFO L141 WitnessManager]: Wrote witness to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/witness.graphml [2020-10-20 01:49:03,635 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-10-20 01:49:03,637 INFO L168 Benchmark]: Toolchain (without parser) took 2528.53 ms. Allocated memory was 32.0 MB in the beginning and 51.4 MB in the end (delta: 19.4 MB). Free memory was 7.4 MB in the beginning and 20.1 MB in the end (delta: -12.7 MB). Peak memory consumption was 6.7 MB. Max. memory is 14.3 GB. [2020-10-20 01:49:03,638 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 29.9 MB. Free memory was 12.0 MB in the beginning and 11.9 MB in the end (delta: 38.1 kB). Peak memory consumption was 38.1 kB. Max. memory is 14.3 GB. [2020-10-20 01:49:03,639 INFO L168 Benchmark]: CACSL2BoogieTranslator took 307.98 ms. Allocated memory was 32.0 MB in the beginning and 43.5 MB in the end (delta: 11.5 MB). Free memory was 6.5 MB in the beginning and 23.2 MB in the end (delta: -16.6 MB). Peak memory consumption was 6.9 MB. Max. memory is 14.3 GB. [2020-10-20 01:49:03,639 INFO L168 Benchmark]: Boogie Procedure Inliner took 31.68 ms. Allocated memory is still 43.5 MB. Free memory was 23.0 MB in the beginning and 21.4 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 14.3 GB. [2020-10-20 01:49:03,640 INFO L168 Benchmark]: Boogie Preprocessor took 25.17 ms. Allocated memory is still 43.5 MB. Free memory was 21.4 MB in the beginning and 19.8 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 14.3 GB. [2020-10-20 01:49:03,641 INFO L168 Benchmark]: RCFGBuilder took 440.86 ms. Allocated memory was 43.5 MB in the beginning and 44.0 MB in the end (delta: 524.3 kB). Free memory was 19.8 MB in the beginning and 25.7 MB in the end (delta: -5.9 MB). Peak memory consumption was 7.5 MB. Max. memory is 14.3 GB. [2020-10-20 01:49:03,641 INFO L168 Benchmark]: TraceAbstraction took 1625.05 ms. Allocated memory was 44.0 MB in the beginning and 51.4 MB in the end (delta: 7.3 MB). Free memory was 25.2 MB in the beginning and 24.1 MB in the end (delta: 1.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 14.3 GB. [2020-10-20 01:49:03,642 INFO L168 Benchmark]: Witness Printer took 87.64 ms. Allocated memory is still 51.4 MB. Free memory was 24.1 MB in the beginning and 20.1 MB in the end (delta: 4.1 MB). Peak memory consumption was 4.1 MB. Max. memory is 14.3 GB. [2020-10-20 01:49:03,646 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 29.9 MB. Free memory was 12.0 MB in the beginning and 11.9 MB in the end (delta: 38.1 kB). Peak memory consumption was 38.1 kB. Max. memory is 14.3 GB. * CACSL2BoogieTranslator took 307.98 ms. Allocated memory was 32.0 MB in the beginning and 43.5 MB in the end (delta: 11.5 MB). Free memory was 6.5 MB in the beginning and 23.2 MB in the end (delta: -16.6 MB). Peak memory consumption was 6.9 MB. Max. memory is 14.3 GB. * Boogie Procedure Inliner took 31.68 ms. Allocated memory is still 43.5 MB. Free memory was 23.0 MB in the beginning and 21.4 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 14.3 GB. * Boogie Preprocessor took 25.17 ms. Allocated memory is still 43.5 MB. Free memory was 21.4 MB in the beginning and 19.8 MB in the end (delta: 1.6 MB). Peak memory consumption was 1.6 MB. Max. memory is 14.3 GB. * RCFGBuilder took 440.86 ms. Allocated memory was 43.5 MB in the beginning and 44.0 MB in the end (delta: 524.3 kB). Free memory was 19.8 MB in the beginning and 25.7 MB in the end (delta: -5.9 MB). Peak memory consumption was 7.5 MB. Max. memory is 14.3 GB. * TraceAbstraction took 1625.05 ms. Allocated memory was 44.0 MB in the beginning and 51.4 MB in the end (delta: 7.3 MB). Free memory was 25.2 MB in the beginning and 24.1 MB in the end (delta: 1.0 MB). Peak memory consumption was 8.4 MB. Max. memory is 14.3 GB. * Witness Printer took 87.64 ms. Allocated memory is still 51.4 MB. Free memory was 24.1 MB in the beginning and 20.1 MB in the end (delta: 4.1 MB). Peak memory consumption was 4.1 MB. Max. memory is 14.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 9]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L60] CALL nondet_tree() [L20] COND FALSE !(__VERIFIER_nondet_bool()) [L23] struct node *n = (struct node *)malloc(sizeof(struct node)); [L24] n->data = __VERIFIER_nondet_int() [L25] CALL, EXPR nondet_tree() [L20] COND TRUE __VERIFIER_nondet_bool() [L21] return 0; VAL [\result={0:0}] [L25] RET, EXPR nondet_tree() VAL [malloc(sizeof(struct node))={-1:0}, n={-1:0}, nondet_tree()={0:0}] [L25] n->left = nondet_tree() [L26] CALL, EXPR nondet_tree() [L20] COND TRUE __VERIFIER_nondet_bool() [L21] return 0; VAL [\result={0:0}] [L26] RET, EXPR nondet_tree() VAL [malloc(sizeof(struct node))={-1:0}, n={-1:0}, nondet_tree()={0:0}] [L26] n->right = nondet_tree() [L27] return n; VAL [\result={-1:0}, malloc(sizeof(struct node))={-1:0}, n={-1:0}] [L60] RET nondet_tree() [L55] CALL, EXPR max(n) VAL [n={-1:0}] [L32] COND FALSE !(!n) [L35] EXPR n->left VAL [n={-1:0}, n={-1:0}, n->left={0:0}] [L35] CALL, EXPR max(n->left) VAL [n={0:0}] [L32] COND TRUE !n [L33] return -2147483648; VAL [\result=-2147483648, n={0:0}, n={0:0}] [L35] RET, EXPR max(n->left) VAL [max(n->left)=-2147483648, n={-1:0}, n={-1:0}, n->left={0:0}] [L35] int a = max(n->left); [L36] EXPR n->right VAL [a=-2147483648, n={-1:0}, n={-1:0}, n->right={0:0}] [L36] CALL, EXPR max(n->right) VAL [n={0:0}] [L32] COND TRUE !n [L33] return -2147483648; VAL [\result=-2147483648, n={0:0}, n={0:0}] [L36] RET, EXPR max(n->right) VAL [a=-2147483648, max(n->right)=-2147483648, n={-1:0}, n={-1:0}, n->right={0:0}] [L36] int b = max(n->right); [L37] COND TRUE a >= b [L37] return a; VAL [\result=-2147483648, a=-2147483648, b=-2147483648, n={-1:0}, n={-1:0}] [L55] RET, EXPR max(n) [L55] int a = max(n); [L56] CALL check(n, a) [L43] COND TRUE \read(*n) [L44] n->data [L11] COND TRUE !cond [L9] __assert_fail("0", "tree_max_incorrect.c", 9, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 41 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.5s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 68 SDtfs, 69 SDslu, 223 SDs, 0 SdLazy, 320 SolverSat, 30 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 34 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=41occurred 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: 0.0s AutomataMinimizationTime, 2 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.3s InterpolantComputationTime, 87 NumberOfCodeBlocks, 87 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 44 ConstructedInterpolants, 0 QuantifiedInterpolants, 5128 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 2 InterpolantComputations, 2 PerfectInterpolantSequences, 9/9 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...