./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 69874e26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_e6bfd781-4099-44e6-85c7-0d63959329b6/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_e6bfd781-4099-44e6-85c7-0d63959329b6/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_e6bfd781-4099-44e6-85c7-0d63959329b6/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_e6bfd781-4099-44e6-85c7-0d63959329b6/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/verifythis/tree_max_incorrect.c -s /tmp/vcloud-vcloud-master/worker/run_dir_e6bfd781-4099-44e6-85c7-0d63959329b6/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_e6bfd781-4099-44e6-85c7-0d63959329b6/bin/uautomizer --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 0.2.0-69874e2 [2020-12-01 14:53:35,371 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-01 14:53:35,380 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-01 14:53:35,419 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-01 14:53:35,419 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-01 14:53:35,421 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-01 14:53:35,423 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-01 14:53:35,425 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-01 14:53:35,427 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-01 14:53:35,428 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-01 14:53:35,430 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-01 14:53:35,431 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-01 14:53:35,432 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-01 14:53:35,433 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-01 14:53:35,435 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-01 14:53:35,436 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-01 14:53:35,437 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-01 14:53:35,438 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-01 14:53:35,441 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-01 14:53:35,443 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-01 14:53:35,445 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-01 14:53:35,447 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-01 14:53:35,448 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-01 14:53:35,449 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-01 14:53:35,453 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-01 14:53:35,453 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-01 14:53:35,454 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-01 14:53:35,455 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-01 14:53:35,456 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-01 14:53:35,457 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-01 14:53:35,458 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-01 14:53:35,459 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-01 14:53:35,460 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-01 14:53:35,461 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-01 14:53:35,462 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-01 14:53:35,462 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-01 14:53:35,463 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-01 14:53:35,463 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-01 14:53:35,463 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-01 14:53:35,464 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-01 14:53:35,465 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-01 14:53:35,466 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_e6bfd781-4099-44e6-85c7-0d63959329b6/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-12-01 14:53:35,488 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-01 14:53:35,489 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-01 14:53:35,490 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-01 14:53:35,490 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-01 14:53:35,491 INFO L138 SettingsManager]: * Use SBE=true [2020-12-01 14:53:35,491 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-01 14:53:35,491 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-01 14:53:35,492 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-01 14:53:35,492 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-01 14:53:35,492 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-01 14:53:35,492 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-01 14:53:35,493 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-01 14:53:35,493 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-01 14:53:35,493 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-01 14:53:35,493 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-01 14:53:35,494 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-01 14:53:35,494 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-01 14:53:35,494 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-01 14:53:35,495 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-01 14:53:35,495 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-12-01 14:53:35,495 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-01 14:53:35,495 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-01 14:53:35,496 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-01 14:53:35,496 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-01 14:53:35,496 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-01 14:53:35,497 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-01 14:53:35,497 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-01 14:53:35,497 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-01 14:53:35,497 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-01 14:53:35,498 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_e6bfd781-4099-44e6-85c7-0d63959329b6/bin/uautomizer/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_e6bfd781-4099-44e6-85c7-0d63959329b6/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fdb95a531f91b891105aa672579f7a5a4ed687cf [2020-12-01 14:53:35,770 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-01 14:53:35,793 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-01 14:53:35,796 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-01 14:53:35,797 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-01 14:53:35,799 INFO L275 PluginConnector]: CDTParser initialized [2020-12-01 14:53:35,801 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_e6bfd781-4099-44e6-85c7-0d63959329b6/bin/uautomizer/../../sv-benchmarks/c/verifythis/tree_max_incorrect.c [2020-12-01 14:53:35,890 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_e6bfd781-4099-44e6-85c7-0d63959329b6/bin/uautomizer/data/70c4dc9a3/f220ea425a4f446bb976c77a84084808/FLAGbfb22f47b [2020-12-01 14:53:36,329 INFO L306 CDTParser]: Found 1 translation units. [2020-12-01 14:53:36,332 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_e6bfd781-4099-44e6-85c7-0d63959329b6/sv-benchmarks/c/verifythis/tree_max_incorrect.c [2020-12-01 14:53:36,346 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_e6bfd781-4099-44e6-85c7-0d63959329b6/bin/uautomizer/data/70c4dc9a3/f220ea425a4f446bb976c77a84084808/FLAGbfb22f47b [2020-12-01 14:53:36,729 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_e6bfd781-4099-44e6-85c7-0d63959329b6/bin/uautomizer/data/70c4dc9a3/f220ea425a4f446bb976c77a84084808 [2020-12-01 14:53:36,733 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-01 14:53:36,735 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-01 14:53:36,742 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-01 14:53:36,742 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-01 14:53:36,746 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-01 14:53:36,747 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.12 02:53:36" (1/1) ... [2020-12-01 14:53:36,749 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4898d961 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:53:36, skipping insertion in model container [2020-12-01 14:53:36,750 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.12 02:53:36" (1/1) ... [2020-12-01 14:53:36,757 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-01 14:53:36,774 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-01 14:53:36,963 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-01 14:53:36,973 INFO L203 MainTranslator]: Completed pre-run [2020-12-01 14:53:36,993 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-01 14:53:37,011 INFO L208 MainTranslator]: Completed translation [2020-12-01 14:53:37,011 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:53:37 WrapperNode [2020-12-01 14:53:37,012 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-01 14:53:37,013 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-01 14:53:37,013 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-01 14:53:37,013 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-01 14:53:37,022 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:53:37" (1/1) ... [2020-12-01 14:53:37,030 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:53:37" (1/1) ... [2020-12-01 14:53:37,048 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-01 14:53:37,049 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-01 14:53:37,049 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-01 14:53:37,049 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-01 14:53:37,057 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:53:37" (1/1) ... [2020-12-01 14:53:37,058 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:53:37" (1/1) ... [2020-12-01 14:53:37,061 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:53:37" (1/1) ... [2020-12-01 14:53:37,061 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:53:37" (1/1) ... [2020-12-01 14:53:37,069 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:53:37" (1/1) ... [2020-12-01 14:53:37,071 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:53:37" (1/1) ... [2020-12-01 14:53:37,078 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:53:37" (1/1) ... [2020-12-01 14:53:37,081 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-01 14:53:37,088 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-01 14:53:37,088 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-01 14:53:37,089 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-01 14:53:37,089 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:53:37" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_e6bfd781-4099-44e6-85c7-0d63959329b6/bin/uautomizer/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 [2020-12-01 14:53:37,147 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-12-01 14:53:37,147 INFO L130 BoogieDeclarations]: Found specification of procedure max [2020-12-01 14:53:37,147 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2020-12-01 14:53:37,147 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2020-12-01 14:53:37,148 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2020-12-01 14:53:37,148 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-01 14:53:37,148 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-12-01 14:53:37,148 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-12-01 14:53:37,148 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-12-01 14:53:37,148 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-01 14:53:37,148 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-01 14:53:37,149 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-12-01 14:53:37,149 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-01 14:53:37,149 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-01 14:53:37,149 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-01 14:53:37,429 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-01 14:53:37,429 INFO L298 CfgBuilder]: Removed 10 assume(true) statements. [2020-12-01 14:53:37,430 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.12 02:53:37 BoogieIcfgContainer [2020-12-01 14:53:37,431 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-01 14:53:37,432 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-01 14:53:37,432 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-01 14:53:37,436 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-01 14:53:37,436 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.12 02:53:36" (1/3) ... [2020-12-01 14:53:37,437 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@648f361d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.12 02:53:37, skipping insertion in model container [2020-12-01 14:53:37,437 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:53:37" (2/3) ... [2020-12-01 14:53:37,438 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@648f361d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.12 02:53:37, skipping insertion in model container [2020-12-01 14:53:37,438 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.12 02:53:37" (3/3) ... [2020-12-01 14:53:37,439 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_max_incorrect.c [2020-12-01 14:53:37,452 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-01 14:53:37,455 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-01 14:53:37,465 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-01 14:53:37,489 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-01 14:53:37,489 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-01 14:53:37,489 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-01 14:53:37,489 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-01 14:53:37,489 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-01 14:53:37,489 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-01 14:53:37,490 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-01 14:53:37,490 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-01 14:53:37,506 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2020-12-01 14:53:37,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-12-01 14:53:37,512 INFO L414 BasicCegarLoop]: Found error trace [2020-12-01 14:53:37,513 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-01 14:53:37,514 INFO L429 AbstractCegarLoop]: === Iteration 1 === [checkErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-01 14:53:37,519 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 14:53:37,519 INFO L82 PathProgramCache]: Analyzing trace with hash -21493180, now seen corresponding path program 1 times [2020-12-01 14:53:37,528 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 14:53:37,529 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [925680154] [2020-12-01 14:53:37,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 14:53:37,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 14:53:37,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-01 14:53:37,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 14:53:37,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-12-01 14:53:38,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 14:53:38,014 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 14:53:38,015 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [925680154] [2020-12-01 14:53:38,016 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-01 14:53:38,016 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-12-01 14:53:38,017 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218309919] [2020-12-01 14:53:38,022 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-01 14:53:38,022 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-01 14:53:38,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-01 14:53:38,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-12-01 14:53:38,042 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 8 states. [2020-12-01 14:53:38,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-01 14:53:38,433 INFO L93 Difference]: Finished difference Result 74 states and 97 transitions. [2020-12-01 14:53:38,434 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-01 14:53:38,435 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-12-01 14:53:38,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-01 14:53:38,446 INFO L225 Difference]: With dead ends: 74 [2020-12-01 14:53:38,446 INFO L226 Difference]: Without dead ends: 34 [2020-12-01 14:53:38,450 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 [2020-12-01 14:53:38,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-01 14:53:38,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-12-01 14:53:38,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-01 14:53:38,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 43 transitions. [2020-12-01 14:53:38,496 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 43 transitions. Word has length 18 [2020-12-01 14:53:38,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-01 14:53:38,496 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 43 transitions. [2020-12-01 14:53:38,497 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-01 14:53:38,497 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 43 transitions. [2020-12-01 14:53:38,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-12-01 14:53:38,500 INFO L414 BasicCegarLoop]: Found error trace [2020-12-01 14:53:38,500 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] [2020-12-01 14:53:38,500 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-01 14:53:38,501 INFO L429 AbstractCegarLoop]: === Iteration 2 === [checkErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-01 14:53:38,502 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 14:53:38,502 INFO L82 PathProgramCache]: Analyzing trace with hash 1041522055, now seen corresponding path program 1 times [2020-12-01 14:53:38,503 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 14:53:38,503 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2092676270] [2020-12-01 14:53:38,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 14:53:38,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 14:53:38,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-01 14:53:38,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 14:53:38,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-12-01 14:53:38,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 14:53:38,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-12-01 14:53:38,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 14:53:38,719 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-12-01 14:53:38,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 14:53:38,767 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-01 14:53:38,768 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2092676270] [2020-12-01 14:53:38,768 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-01 14:53:38,768 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-12-01 14:53:38,768 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [50191526] [2020-12-01 14:53:38,770 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-01 14:53:38,770 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-01 14:53:38,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-01 14:53:38,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-12-01 14:53:38,771 INFO L87 Difference]: Start difference. First operand 34 states and 43 transitions. Second operand 9 states. [2020-12-01 14:53:39,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-01 14:53:39,018 INFO L93 Difference]: Finished difference Result 47 states and 59 transitions. [2020-12-01 14:53:39,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-01 14:53:39,021 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-12-01 14:53:39,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-01 14:53:39,025 INFO L225 Difference]: With dead ends: 47 [2020-12-01 14:53:39,026 INFO L226 Difference]: Without dead ends: 36 [2020-12-01 14:53:39,028 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 [2020-12-01 14:53:39,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-01 14:53:39,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-12-01 14:53:39,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-01 14:53:39,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 46 transitions. [2020-12-01 14:53:39,055 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 46 transitions. Word has length 28 [2020-12-01 14:53:39,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-01 14:53:39,056 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 46 transitions. [2020-12-01 14:53:39,057 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-01 14:53:39,058 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 46 transitions. [2020-12-01 14:53:39,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-12-01 14:53:39,059 INFO L414 BasicCegarLoop]: Found error trace [2020-12-01 14:53:39,060 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] [2020-12-01 14:53:39,060 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-01 14:53:39,060 INFO L429 AbstractCegarLoop]: === Iteration 3 === [checkErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-01 14:53:39,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 14:53:39,061 INFO L82 PathProgramCache]: Analyzing trace with hash 1590309937, now seen corresponding path program 1 times [2020-12-01 14:53:39,061 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 14:53:39,062 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1201800682] [2020-12-01 14:53:39,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 14:53:39,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 14:53:39,161 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 14:53:39,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-01 14:53:39,228 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-01 14:53:39,290 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-01 14:53:39,291 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-01 14:53:39,291 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-01 14:53:39,340 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 01.12 02:53:39 BoogieIcfgContainer [2020-12-01 14:53:39,341 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-01 14:53:39,341 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-01 14:53:39,341 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-01 14:53:39,347 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-01 14:53:39,348 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.12 02:53:37" (3/4) ... [2020-12-01 14:53:39,350 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-01 14:53:39,431 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_e6bfd781-4099-44e6-85c7-0d63959329b6/bin/uautomizer/witness.graphml [2020-12-01 14:53:39,431 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-01 14:53:39,433 INFO L168 Benchmark]: Toolchain (without parser) took 2696.29 ms. Allocated memory was 90.2 MB in the beginning and 127.9 MB in the end (delta: 37.7 MB). Free memory was 54.7 MB in the beginning and 55.5 MB in the end (delta: -743.1 kB). Peak memory consumption was 35.9 MB. Max. memory is 16.1 GB. [2020-12-01 14:53:39,433 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 90.2 MB. Free memory is still 71.6 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-01 14:53:39,434 INFO L168 Benchmark]: CACSL2BoogieTranslator took 270.36 ms. Allocated memory is still 90.2 MB. Free memory was 54.5 MB in the beginning and 67.1 MB in the end (delta: -12.6 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-12-01 14:53:39,434 INFO L168 Benchmark]: Boogie Procedure Inliner took 35.54 ms. Allocated memory is still 90.2 MB. Free memory was 67.1 MB in the beginning and 65.5 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-01 14:53:39,435 INFO L168 Benchmark]: Boogie Preprocessor took 38.35 ms. Allocated memory is still 90.2 MB. Free memory was 65.5 MB in the beginning and 64.5 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-01 14:53:39,436 INFO L168 Benchmark]: RCFGBuilder took 342.56 ms. Allocated memory is still 90.2 MB. Free memory was 64.2 MB in the beginning and 45.9 MB in the end (delta: 18.3 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. [2020-12-01 14:53:39,436 INFO L168 Benchmark]: TraceAbstraction took 1908.49 ms. Allocated memory was 90.2 MB in the beginning and 127.9 MB in the end (delta: 37.7 MB). Free memory was 45.6 MB in the beginning and 58.6 MB in the end (delta: -13.0 MB). Peak memory consumption was 26.1 MB. Max. memory is 16.1 GB. [2020-12-01 14:53:39,437 INFO L168 Benchmark]: Witness Printer took 89.97 ms. Allocated memory is still 127.9 MB. Free memory was 58.6 MB in the beginning and 55.5 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-01 14:53:39,440 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 90.2 MB. Free memory is still 71.6 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 270.36 ms. Allocated memory is still 90.2 MB. Free memory was 54.5 MB in the beginning and 67.1 MB in the end (delta: -12.6 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 35.54 ms. Allocated memory is still 90.2 MB. Free memory was 67.1 MB in the beginning and 65.5 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 38.35 ms. Allocated memory is still 90.2 MB. Free memory was 65.5 MB in the beginning and 64.5 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 342.56 ms. Allocated memory is still 90.2 MB. Free memory was 64.2 MB in the beginning and 45.9 MB in the end (delta: 18.3 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. * TraceAbstraction took 1908.49 ms. Allocated memory was 90.2 MB in the beginning and 127.9 MB in the end (delta: 37.7 MB). Free memory was 45.6 MB in the beginning and 58.6 MB in the end (delta: -13.0 MB). Peak memory consumption was 26.1 MB. Max. memory is 16.1 GB. * Witness Printer took 89.97 ms. Allocated memory is still 127.9 MB. Free memory was 58.6 MB in the beginning and 55.5 MB in the end (delta: 3.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 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: 1.8s, 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, 0.5s 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...