./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 a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_d1c75820-9add-477f-a756-fba638451288/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_d1c75820-9add-477f-a756-fba638451288/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_d1c75820-9add-477f-a756-fba638451288/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_d1c75820-9add-477f-a756-fba638451288/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/verifythis/tree_max_incorrect.c -s /tmp/vcloud-vcloud-master/worker/run_dir_d1c75820-9add-477f-a756-fba638451288/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_d1c75820-9add-477f-a756-fba638451288/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-a4ecdab [2020-11-28 03:00:00,838 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 03:00:00,840 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 03:00:00,904 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 03:00:00,904 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 03:00:00,909 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 03:00:00,912 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 03:00:00,916 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 03:00:00,919 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 03:00:00,930 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 03:00:00,931 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 03:00:00,934 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 03:00:00,934 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 03:00:00,938 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 03:00:00,940 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 03:00:00,943 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 03:00:00,944 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 03:00:00,948 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 03:00:00,952 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 03:00:00,961 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 03:00:00,963 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 03:00:00,965 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 03:00:00,967 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 03:00:00,969 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 03:00:00,979 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 03:00:00,979 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 03:00:00,980 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 03:00:00,982 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 03:00:00,983 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 03:00:00,985 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 03:00:00,985 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 03:00:00,986 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 03:00:00,989 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 03:00:00,990 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 03:00:00,991 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 03:00:00,992 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 03:00:00,993 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 03:00:00,993 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 03:00:00,993 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 03:00:00,994 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 03:00:00,997 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 03:00:00,998 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_d1c75820-9add-477f-a756-fba638451288/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-11-28 03:00:01,047 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 03:00:01,053 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 03:00:01,055 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-28 03:00:01,055 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-28 03:00:01,056 INFO L138 SettingsManager]: * Use SBE=true [2020-11-28 03:00:01,056 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 03:00:01,056 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-28 03:00:01,056 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 03:00:01,056 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-28 03:00:01,056 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 03:00:01,057 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-28 03:00:01,058 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-28 03:00:01,058 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-28 03:00:01,058 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-28 03:00:01,058 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-28 03:00:01,059 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 03:00:01,059 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-28 03:00:01,059 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 03:00:01,060 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-28 03:00:01,061 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-28 03:00:01,062 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-28 03:00:01,068 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 03:00:01,069 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 03:00:01,070 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-28 03:00:01,070 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-28 03:00:01,071 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-28 03:00:01,072 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-28 03:00:01,072 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-28 03:00:01,072 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 03:00:01,072 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_d1c75820-9add-477f-a756-fba638451288/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_d1c75820-9add-477f-a756-fba638451288/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fdb95a531f91b891105aa672579f7a5a4ed687cf [2020-11-28 03:00:01,355 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 03:00:01,397 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 03:00:01,400 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 03:00:01,403 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 03:00:01,405 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 03:00:01,406 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_d1c75820-9add-477f-a756-fba638451288/bin/uautomizer/../../sv-benchmarks/c/verifythis/tree_max_incorrect.c [2020-11-28 03:00:01,504 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_d1c75820-9add-477f-a756-fba638451288/bin/uautomizer/data/b644adb15/fdf58e9335a8479b96d872c481be2c13/FLAG1aaa6b536 [2020-11-28 03:00:02,017 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 03:00:02,018 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_d1c75820-9add-477f-a756-fba638451288/sv-benchmarks/c/verifythis/tree_max_incorrect.c [2020-11-28 03:00:02,029 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_d1c75820-9add-477f-a756-fba638451288/bin/uautomizer/data/b644adb15/fdf58e9335a8479b96d872c481be2c13/FLAG1aaa6b536 [2020-11-28 03:00:02,397 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_d1c75820-9add-477f-a756-fba638451288/bin/uautomizer/data/b644adb15/fdf58e9335a8479b96d872c481be2c13 [2020-11-28 03:00:02,401 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 03:00:02,402 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 03:00:02,405 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 03:00:02,405 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 03:00:02,409 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 03:00:02,410 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 03:00:02" (1/1) ... [2020-11-28 03:00:02,413 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c337163 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:00:02, skipping insertion in model container [2020-11-28 03:00:02,413 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 03:00:02" (1/1) ... [2020-11-28 03:00:02,421 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 03:00:02,440 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 03:00:02,639 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 03:00:02,650 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 03:00:02,675 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 03:00:02,694 INFO L208 MainTranslator]: Completed translation [2020-11-28 03:00:02,695 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:00:02 WrapperNode [2020-11-28 03:00:02,695 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 03:00:02,697 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 03:00:02,697 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 03:00:02,697 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 03:00:02,706 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:00:02" (1/1) ... [2020-11-28 03:00:02,716 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:00:02" (1/1) ... [2020-11-28 03:00:02,736 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 03:00:02,737 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 03:00:02,738 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 03:00:02,738 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 03:00:02,745 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:00:02" (1/1) ... [2020-11-28 03:00:02,745 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:00:02" (1/1) ... [2020-11-28 03:00:02,749 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:00:02" (1/1) ... [2020-11-28 03:00:02,749 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:00:02" (1/1) ... [2020-11-28 03:00:02,757 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:00:02" (1/1) ... [2020-11-28 03:00:02,760 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:00:02" (1/1) ... [2020-11-28 03:00:02,763 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:00:02" (1/1) ... [2020-11-28 03:00:02,767 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 03:00:02,768 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 03:00:02,768 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 03:00:02,768 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 03:00:02,770 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:00:02" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_d1c75820-9add-477f-a756-fba638451288/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 [2020-11-28 03:00:02,840 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-11-28 03:00:02,841 INFO L130 BoogieDeclarations]: Found specification of procedure max [2020-11-28 03:00:02,841 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2020-11-28 03:00:02,841 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2020-11-28 03:00:02,841 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2020-11-28 03:00:02,841 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-28 03:00:02,842 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-11-28 03:00:02,842 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-11-28 03:00:02,842 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-11-28 03:00:02,842 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-28 03:00:02,843 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-28 03:00:02,843 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-11-28 03:00:02,843 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 03:00:02,843 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 03:00:02,843 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-28 03:00:03,240 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 03:00:03,240 INFO L298 CfgBuilder]: Removed 10 assume(true) statements. [2020-11-28 03:00:03,241 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:00:03 BoogieIcfgContainer [2020-11-28 03:00:03,242 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 03:00:03,244 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-28 03:00:03,244 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-28 03:00:03,248 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-28 03:00:03,248 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 03:00:02" (1/3) ... [2020-11-28 03:00:03,249 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@547fd411 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 03:00:03, skipping insertion in model container [2020-11-28 03:00:03,249 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:00:02" (2/3) ... [2020-11-28 03:00:03,250 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@547fd411 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 03:00:03, skipping insertion in model container [2020-11-28 03:00:03,250 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:00:03" (3/3) ... [2020-11-28 03:00:03,252 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_max_incorrect.c [2020-11-28 03:00:03,264 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-28 03:00:03,269 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-28 03:00:03,283 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-28 03:00:03,311 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-28 03:00:03,311 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-28 03:00:03,311 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-28 03:00:03,311 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 03:00:03,311 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 03:00:03,311 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-28 03:00:03,312 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 03:00:03,312 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-28 03:00:03,330 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2020-11-28 03:00:03,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-11-28 03:00:03,337 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:00:03,338 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:00:03,338 INFO L429 AbstractCegarLoop]: === Iteration 1 === [checkErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:00:03,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:00:03,345 INFO L82 PathProgramCache]: Analyzing trace with hash -21493180, now seen corresponding path program 1 times [2020-11-28 03:00:03,355 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:00:03,355 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [500805958] [2020-11-28 03:00:03,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:00:03,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:00:03,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-28 03:00:03,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:00:03,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2020-11-28 03:00:03,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:00:03,804 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:00:03,805 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [500805958] [2020-11-28 03:00:03,805 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 03:00:03,806 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-11-28 03:00:03,806 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873949] [2020-11-28 03:00:03,811 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-28 03:00:03,811 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:00:03,832 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-28 03:00:03,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-11-28 03:00:03,835 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 8 states. [2020-11-28 03:00:04,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:00:04,394 INFO L93 Difference]: Finished difference Result 74 states and 97 transitions. [2020-11-28 03:00:04,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-28 03:00:04,397 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-11-28 03:00:04,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:00:04,411 INFO L225 Difference]: With dead ends: 74 [2020-11-28 03:00:04,411 INFO L226 Difference]: Without dead ends: 34 [2020-11-28 03:00:04,419 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2020-11-28 03:00:04,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-11-28 03:00:04,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-11-28 03:00:04,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-11-28 03:00:04,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 43 transitions. [2020-11-28 03:00:04,484 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 43 transitions. Word has length 18 [2020-11-28 03:00:04,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:00:04,485 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 43 transitions. [2020-11-28 03:00:04,485 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-28 03:00:04,486 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 43 transitions. [2020-11-28 03:00:04,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-11-28 03:00:04,489 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:00:04,489 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] [2020-11-28 03:00:04,489 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-28 03:00:04,490 INFO L429 AbstractCegarLoop]: === Iteration 2 === [checkErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:00:04,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:00:04,491 INFO L82 PathProgramCache]: Analyzing trace with hash 1041522055, now seen corresponding path program 1 times [2020-11-28 03:00:04,491 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:00:04,492 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2099350234] [2020-11-28 03:00:04,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:00:04,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:00:04,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-11-28 03:00:04,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:00:04,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-11-28 03:00:04,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:00:04,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-28 03:00:04,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:00:04,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-11-28 03:00:04,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:00:04,843 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-28 03:00:04,843 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2099350234] [2020-11-28 03:00:04,843 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 03:00:04,844 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-11-28 03:00:04,844 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772873425] [2020-11-28 03:00:04,846 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-28 03:00:04,846 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:00:04,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-28 03:00:04,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-11-28 03:00:04,847 INFO L87 Difference]: Start difference. First operand 34 states and 43 transitions. Second operand 9 states. [2020-11-28 03:00:05,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:00:05,221 INFO L93 Difference]: Finished difference Result 47 states and 59 transitions. [2020-11-28 03:00:05,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-28 03:00:05,222 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-11-28 03:00:05,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:00:05,225 INFO L225 Difference]: With dead ends: 47 [2020-11-28 03:00:05,225 INFO L226 Difference]: Without dead ends: 36 [2020-11-28 03:00:05,226 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 [2020-11-28 03:00:05,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-11-28 03:00:05,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-11-28 03:00:05,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-11-28 03:00:05,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 46 transitions. [2020-11-28 03:00:05,246 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 46 transitions. Word has length 28 [2020-11-28 03:00:05,246 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:00:05,246 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 46 transitions. [2020-11-28 03:00:05,246 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-28 03:00:05,247 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 46 transitions. [2020-11-28 03:00:05,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-11-28 03:00:05,254 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:00:05,254 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] [2020-11-28 03:00:05,255 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-28 03:00:05,255 INFO L429 AbstractCegarLoop]: === Iteration 3 === [checkErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:00:05,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:00:05,258 INFO L82 PathProgramCache]: Analyzing trace with hash 1590309937, now seen corresponding path program 1 times [2020-11-28 03:00:05,258 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:00:05,259 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2069863113] [2020-11-28 03:00:05,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:00:05,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:00:05,353 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:00:05,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:00:05,404 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:00:05,444 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:00:05,444 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-28 03:00:05,445 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-28 03:00:05,516 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 03:00:05 BoogieIcfgContainer [2020-11-28 03:00:05,516 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-28 03:00:05,517 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 03:00:05,517 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 03:00:05,517 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 03:00:05,518 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:00:03" (3/4) ... [2020-11-28 03:00:05,520 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-28 03:00:05,599 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_d1c75820-9add-477f-a756-fba638451288/bin/uautomizer/witness.graphml [2020-11-28 03:00:05,599 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 03:00:05,602 INFO L168 Benchmark]: Toolchain (without parser) took 3197.94 ms. Allocated memory was 119.5 MB in the beginning and 144.7 MB in the end (delta: 25.2 MB). Free memory was 91.0 MB in the beginning and 95.9 MB in the end (delta: -4.8 MB). Peak memory consumption was 20.9 MB. Max. memory is 16.1 GB. [2020-11-28 03:00:05,603 INFO L168 Benchmark]: CDTParser took 0.31 ms. Allocated memory is still 83.9 MB. Free memory was 42.0 MB in the beginning and 41.9 MB in the end (delta: 38.3 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:00:05,603 INFO L168 Benchmark]: CACSL2BoogieTranslator took 291.28 ms. Allocated memory is still 119.5 MB. Free memory was 91.0 MB in the beginning and 95.8 MB in the end (delta: -4.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-28 03:00:05,604 INFO L168 Benchmark]: Boogie Procedure Inliner took 39.97 ms. Allocated memory is still 119.5 MB. Free memory was 95.8 MB in the beginning and 94.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 03:00:05,605 INFO L168 Benchmark]: Boogie Preprocessor took 29.44 ms. Allocated memory is still 119.5 MB. Free memory was 94.1 MB in the beginning and 93.0 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 03:00:05,606 INFO L168 Benchmark]: RCFGBuilder took 473.93 ms. Allocated memory is still 119.5 MB. Free memory was 93.0 MB in the beginning and 74.5 MB in the end (delta: 18.5 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. [2020-11-28 03:00:05,607 INFO L168 Benchmark]: TraceAbstraction took 2272.57 ms. Allocated memory was 119.5 MB in the beginning and 144.7 MB in the end (delta: 25.2 MB). Free memory was 74.1 MB in the beginning and 99.0 MB in the end (delta: -24.9 MB). Peak memory consumption was 604.6 kB. Max. memory is 16.1 GB. [2020-11-28 03:00:05,608 INFO L168 Benchmark]: Witness Printer took 82.61 ms. Allocated memory is still 144.7 MB. Free memory was 99.0 MB in the beginning and 95.9 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-11-28 03:00:05,613 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.31 ms. Allocated memory is still 83.9 MB. Free memory was 42.0 MB in the beginning and 41.9 MB in the end (delta: 38.3 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 291.28 ms. Allocated memory is still 119.5 MB. Free memory was 91.0 MB in the beginning and 95.8 MB in the end (delta: -4.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 39.97 ms. Allocated memory is still 119.5 MB. Free memory was 95.8 MB in the beginning and 94.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 29.44 ms. Allocated memory is still 119.5 MB. Free memory was 94.1 MB in the beginning and 93.0 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 473.93 ms. Allocated memory is still 119.5 MB. Free memory was 93.0 MB in the beginning and 74.5 MB in the end (delta: 18.5 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. * TraceAbstraction took 2272.57 ms. Allocated memory was 119.5 MB in the beginning and 144.7 MB in the end (delta: 25.2 MB). Free memory was 74.1 MB in the beginning and 99.0 MB in the end (delta: -24.9 MB). Peak memory consumption was 604.6 kB. Max. memory is 16.1 GB. * Witness Printer took 82.61 ms. Allocated memory is still 144.7 MB. Free memory was 99.0 MB in the beginning and 95.9 MB in the end (delta: 3.1 MB). Peak memory consumption was 4.2 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: 2.1s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 0.9s, 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, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 34 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s 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, 0.6s 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...