./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 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f66acf-188a-4bbb-9ab6-4399648ba4dd/bin/uautomizer-Z5i5R5N3CC/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f66acf-188a-4bbb-9ab6-4399648ba4dd/bin/uautomizer-Z5i5R5N3CC/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f66acf-188a-4bbb-9ab6-4399648ba4dd/bin/uautomizer-Z5i5R5N3CC/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f66acf-188a-4bbb-9ab6-4399648ba4dd/bin/uautomizer-Z5i5R5N3CC/config/AutomizerReach.xml -i ../../sv-benchmarks/c/verifythis/tree_max_incorrect.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f66acf-188a-4bbb-9ab6-4399648ba4dd/bin/uautomizer-Z5i5R5N3CC/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f66acf-188a-4bbb-9ab6-4399648ba4dd/bin/uautomizer-Z5i5R5N3CC --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 0.2.0-7b2dab5 [2021-10-11 00:21:32,025 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-10-11 00:21:32,027 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-10-11 00:21:32,082 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-10-11 00:21:32,083 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-10-11 00:21:32,084 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-10-11 00:21:32,086 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-10-11 00:21:32,089 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-10-11 00:21:32,092 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-10-11 00:21:32,093 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-10-11 00:21:32,095 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-10-11 00:21:32,097 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-10-11 00:21:32,097 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-10-11 00:21:32,099 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-10-11 00:21:32,101 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-10-11 00:21:32,102 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-10-11 00:21:32,104 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-10-11 00:21:32,105 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-10-11 00:21:32,108 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-10-11 00:21:32,111 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-10-11 00:21:32,113 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-10-11 00:21:32,115 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-10-11 00:21:32,117 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-10-11 00:21:32,119 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-10-11 00:21:32,123 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-10-11 00:21:32,123 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-10-11 00:21:32,124 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-10-11 00:21:32,125 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-10-11 00:21:32,126 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-10-11 00:21:32,128 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-10-11 00:21:32,128 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-10-11 00:21:32,129 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-10-11 00:21:32,131 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-10-11 00:21:32,132 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-10-11 00:21:32,134 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-10-11 00:21:32,134 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-10-11 00:21:32,136 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-10-11 00:21:32,136 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-10-11 00:21:32,137 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-10-11 00:21:32,138 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-10-11 00:21:32,139 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-10-11 00:21:32,141 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f66acf-188a-4bbb-9ab6-4399648ba4dd/bin/uautomizer-Z5i5R5N3CC/config/svcomp-Reach-32bit-Automizer_Default.epf [2021-10-11 00:21:32,167 INFO L113 SettingsManager]: Loading preferences was successful [2021-10-11 00:21:32,168 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-10-11 00:21:32,172 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-10-11 00:21:32,172 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-10-11 00:21:32,173 INFO L138 SettingsManager]: * Use SBE=true [2021-10-11 00:21:32,173 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-10-11 00:21:32,173 INFO L138 SettingsManager]: * sizeof long=4 [2021-10-11 00:21:32,173 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-10-11 00:21:32,174 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-10-11 00:21:32,174 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-10-11 00:21:32,175 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-10-11 00:21:32,175 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-10-11 00:21:32,175 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-10-11 00:21:32,176 INFO L138 SettingsManager]: * sizeof long double=12 [2021-10-11 00:21:32,176 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-10-11 00:21:32,176 INFO L138 SettingsManager]: * Use constant arrays=true [2021-10-11 00:21:32,177 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-10-11 00:21:32,177 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-10-11 00:21:32,177 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-10-11 00:21:32,177 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-10-11 00:21:32,177 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-10-11 00:21:32,178 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-10-11 00:21:32,178 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-10-11 00:21:32,179 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-10-11 00:21:32,179 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-10-11 00:21:32,179 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-10-11 00:21:32,179 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-10-11 00:21:32,180 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-10-11 00:21:32,180 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_worker_vcloud-master_on_vcloud-master/run_dir_92f66acf-188a-4bbb-9ab6-4399648ba4dd/bin/uautomizer-Z5i5R5N3CC/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f66acf-188a-4bbb-9ab6-4399648ba4dd/bin/uautomizer-Z5i5R5N3CC Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fdb95a531f91b891105aa672579f7a5a4ed687cf [2021-10-11 00:21:32,476 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-10-11 00:21:32,515 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-10-11 00:21:32,520 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-10-11 00:21:32,522 INFO L271 PluginConnector]: Initializing CDTParser... [2021-10-11 00:21:32,522 INFO L275 PluginConnector]: CDTParser initialized [2021-10-11 00:21:32,524 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f66acf-188a-4bbb-9ab6-4399648ba4dd/bin/uautomizer-Z5i5R5N3CC/../../sv-benchmarks/c/verifythis/tree_max_incorrect.c [2021-10-11 00:21:32,596 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f66acf-188a-4bbb-9ab6-4399648ba4dd/bin/uautomizer-Z5i5R5N3CC/data/0e463edf9/ccea544ccc9946bf8df0d50e5e46f8ea/FLAG20320a027 [2021-10-11 00:21:33,005 INFO L306 CDTParser]: Found 1 translation units. [2021-10-11 00:21:33,005 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f66acf-188a-4bbb-9ab6-4399648ba4dd/sv-benchmarks/c/verifythis/tree_max_incorrect.c [2021-10-11 00:21:33,016 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f66acf-188a-4bbb-9ab6-4399648ba4dd/bin/uautomizer-Z5i5R5N3CC/data/0e463edf9/ccea544ccc9946bf8df0d50e5e46f8ea/FLAG20320a027 [2021-10-11 00:21:33,400 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f66acf-188a-4bbb-9ab6-4399648ba4dd/bin/uautomizer-Z5i5R5N3CC/data/0e463edf9/ccea544ccc9946bf8df0d50e5e46f8ea [2021-10-11 00:21:33,402 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-10-11 00:21:33,404 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-10-11 00:21:33,406 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-10-11 00:21:33,406 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-10-11 00:21:33,410 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-10-11 00:21:33,412 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 12:21:33" (1/1) ... [2021-10-11 00:21:33,414 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4688b29 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 12:21:33, skipping insertion in model container [2021-10-11 00:21:33,414 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 11.10 12:21:33" (1/1) ... [2021-10-11 00:21:33,422 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-10-11 00:21:33,450 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-10-11 00:21:33,601 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f66acf-188a-4bbb-9ab6-4399648ba4dd/sv-benchmarks/c/verifythis/tree_max_incorrect.c[466,479] [2021-10-11 00:21:33,621 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-11 00:21:33,632 INFO L203 MainTranslator]: Completed pre-run [2021-10-11 00:21:33,644 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f66acf-188a-4bbb-9ab6-4399648ba4dd/sv-benchmarks/c/verifythis/tree_max_incorrect.c[466,479] [2021-10-11 00:21:33,653 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-10-11 00:21:33,670 INFO L208 MainTranslator]: Completed translation [2021-10-11 00:21:33,670 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 12:21:33 WrapperNode [2021-10-11 00:21:33,671 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-10-11 00:21:33,672 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-10-11 00:21:33,672 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-10-11 00:21:33,673 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-10-11 00:21:33,682 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 12:21:33" (1/1) ... [2021-10-11 00:21:33,691 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 12:21:33" (1/1) ... [2021-10-11 00:21:33,712 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-10-11 00:21:33,713 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-10-11 00:21:33,713 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-10-11 00:21:33,713 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-10-11 00:21:33,722 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 12:21:33" (1/1) ... [2021-10-11 00:21:33,723 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 12:21:33" (1/1) ... [2021-10-11 00:21:33,726 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 12:21:33" (1/1) ... [2021-10-11 00:21:33,726 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 12:21:33" (1/1) ... [2021-10-11 00:21:33,734 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 12:21:33" (1/1) ... [2021-10-11 00:21:33,736 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 12:21:33" (1/1) ... [2021-10-11 00:21:33,738 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 12:21:33" (1/1) ... [2021-10-11 00:21:33,741 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-10-11 00:21:33,742 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-10-11 00:21:33,742 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-10-11 00:21:33,742 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-10-11 00:21:33,743 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 12:21:33" (1/1) ... No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f66acf-188a-4bbb-9ab6-4399648ba4dd/bin/uautomizer-Z5i5R5N3CC/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 [2021-10-11 00:21:33,826 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-10-11 00:21:33,827 INFO L130 BoogieDeclarations]: Found specification of procedure max [2021-10-11 00:21:33,827 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2021-10-11 00:21:33,827 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2021-10-11 00:21:33,827 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2021-10-11 00:21:33,827 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-10-11 00:21:33,828 INFO L130 BoogieDeclarations]: Found specification of procedure check [2021-10-11 00:21:33,828 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2021-10-11 00:21:33,828 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-10-11 00:21:33,828 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-10-11 00:21:33,828 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-10-11 00:21:33,829 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-10-11 00:21:33,829 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-10-11 00:21:33,829 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-10-11 00:21:33,829 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-10-11 00:21:34,162 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-10-11 00:21:34,163 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2021-10-11 00:21:34,164 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 12:21:34 BoogieIcfgContainer [2021-10-11 00:21:34,165 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-10-11 00:21:34,166 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-10-11 00:21:34,167 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-10-11 00:21:34,170 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-10-11 00:21:34,171 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 11.10 12:21:33" (1/3) ... [2021-10-11 00:21:34,180 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62beb392 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 12:21:34, skipping insertion in model container [2021-10-11 00:21:34,196 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 11.10 12:21:33" (2/3) ... [2021-10-11 00:21:34,197 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62beb392 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 11.10 12:21:34, skipping insertion in model container [2021-10-11 00:21:34,197 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 12:21:34" (3/3) ... [2021-10-11 00:21:34,199 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_max_incorrect.c [2021-10-11 00:21:34,213 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-10-11 00:21:34,217 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-10-11 00:21:34,227 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-10-11 00:21:34,250 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-10-11 00:21:34,250 INFO L378 AbstractCegarLoop]: Hoare is true [2021-10-11 00:21:34,250 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-10-11 00:21:34,250 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-10-11 00:21:34,250 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-10-11 00:21:34,251 INFO L382 AbstractCegarLoop]: Difference is false [2021-10-11 00:21:34,251 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-10-11 00:21:34,251 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-10-11 00:21:34,268 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states. [2021-10-11 00:21:34,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-10-11 00:21:34,275 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 00:21:34,276 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-10-11 00:21:34,276 INFO L429 AbstractCegarLoop]: === Iteration 1 === [checkErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 00:21:34,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 00:21:34,283 INFO L82 PathProgramCache]: Analyzing trace with hash -891537794, now seen corresponding path program 1 times [2021-10-11 00:21:34,292 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-11 00:21:34,293 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1700136677] [2021-10-11 00:21:34,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 00:21:34,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 00:21:34,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-11 00:21:34,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 00:21:34,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-10-11 00:21:34,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 00:21:34,857 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-10-11 00:21:34,859 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1700136677] [2021-10-11 00:21:34,860 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-11 00:21:34,860 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-10-11 00:21:34,861 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297063091] [2021-10-11 00:21:34,865 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-10-11 00:21:34,866 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-11 00:21:34,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-10-11 00:21:34,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-10-11 00:21:34,882 INFO L87 Difference]: Start difference. First operand 40 states. Second operand 8 states. [2021-10-11 00:21:35,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 00:21:35,326 INFO L93 Difference]: Finished difference Result 73 states and 96 transitions. [2021-10-11 00:21:35,327 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-10-11 00:21:35,328 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2021-10-11 00:21:35,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 00:21:35,343 INFO L225 Difference]: With dead ends: 73 [2021-10-11 00:21:35,343 INFO L226 Difference]: Without dead ends: 34 [2021-10-11 00:21:35,350 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 [2021-10-11 00:21:35,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-10-11 00:21:35,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-10-11 00:21:35,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2021-10-11 00:21:35,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 43 transitions. [2021-10-11 00:21:35,391 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 43 transitions. Word has length 18 [2021-10-11 00:21:35,392 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 00:21:35,392 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 43 transitions. [2021-10-11 00:21:35,392 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-10-11 00:21:35,392 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 43 transitions. [2021-10-11 00:21:35,394 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-10-11 00:21:35,394 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 00:21:35,395 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] [2021-10-11 00:21:35,395 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-10-11 00:21:35,395 INFO L429 AbstractCegarLoop]: === Iteration 2 === [checkErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 00:21:35,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 00:21:35,396 INFO L82 PathProgramCache]: Analyzing trace with hash 1509693249, now seen corresponding path program 1 times [2021-10-11 00:21:35,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-11 00:21:35,397 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [613750758] [2021-10-11 00:21:35,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 00:21:35,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 00:21:35,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-10-11 00:21:35,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 00:21:35,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2021-10-11 00:21:35,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 00:21:35,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-10-11 00:21:35,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 00:21:35,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-10-11 00:21:35,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-10-11 00:21:35,708 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-10-11 00:21:35,709 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [613750758] [2021-10-11 00:21:35,710 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-10-11 00:21:35,710 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-10-11 00:21:35,711 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [893791177] [2021-10-11 00:21:35,712 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-10-11 00:21:35,714 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-10-11 00:21:35,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-10-11 00:21:35,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-10-11 00:21:35,718 INFO L87 Difference]: Start difference. First operand 34 states and 43 transitions. Second operand 9 states. [2021-10-11 00:21:35,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-10-11 00:21:35,983 INFO L93 Difference]: Finished difference Result 47 states and 59 transitions. [2021-10-11 00:21:35,985 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-10-11 00:21:35,985 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2021-10-11 00:21:35,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-10-11 00:21:35,990 INFO L225 Difference]: With dead ends: 47 [2021-10-11 00:21:35,991 INFO L226 Difference]: Without dead ends: 36 [2021-10-11 00:21:35,993 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 [2021-10-11 00:21:35,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-10-11 00:21:36,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-10-11 00:21:36,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2021-10-11 00:21:36,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 46 transitions. [2021-10-11 00:21:36,015 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 46 transitions. Word has length 28 [2021-10-11 00:21:36,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-10-11 00:21:36,019 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 46 transitions. [2021-10-11 00:21:36,020 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-10-11 00:21:36,020 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 46 transitions. [2021-10-11 00:21:36,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-10-11 00:21:36,024 INFO L414 BasicCegarLoop]: Found error trace [2021-10-11 00:21:36,024 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] [2021-10-11 00:21:36,025 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-10-11 00:21:36,026 INFO L429 AbstractCegarLoop]: === Iteration 3 === [checkErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-10-11 00:21:36,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-10-11 00:21:36,029 INFO L82 PathProgramCache]: Analyzing trace with hash -896236761, now seen corresponding path program 1 times [2021-10-11 00:21:36,030 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-10-11 00:21:36,031 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [904972053] [2021-10-11 00:21:36,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-10-11 00:21:36,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-11 00:21:36,096 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-11 00:21:36,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-10-11 00:21:36,129 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-10-11 00:21:36,159 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-10-11 00:21:36,160 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-10-11 00:21:36,162 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-10-11 00:21:36,233 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 11.10 12:21:36 BoogieIcfgContainer [2021-10-11 00:21:36,234 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-10-11 00:21:36,234 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-10-11 00:21:36,234 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-10-11 00:21:36,235 INFO L275 PluginConnector]: Witness Printer initialized [2021-10-11 00:21:36,235 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 11.10 12:21:34" (3/4) ... [2021-10-11 00:21:36,237 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-10-11 00:21:36,311 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_92f66acf-188a-4bbb-9ab6-4399648ba4dd/bin/uautomizer-Z5i5R5N3CC/witness.graphml [2021-10-11 00:21:36,312 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-10-11 00:21:36,314 INFO L168 Benchmark]: Toolchain (without parser) took 2908.93 ms. Allocated memory was 96.5 MB in the beginning and 121.6 MB in the end (delta: 25.2 MB). Free memory was 59.3 MB in the beginning and 62.8 MB in the end (delta: -3.5 MB). Peak memory consumption was 21.5 MB. Max. memory is 16.1 GB. [2021-10-11 00:21:36,314 INFO L168 Benchmark]: CDTParser took 0.56 ms. Allocated memory is still 96.5 MB. Free memory is still 75.5 MB. There was no memory consumed. Max. memory is 16.1 GB. [2021-10-11 00:21:36,315 INFO L168 Benchmark]: CACSL2BoogieTranslator took 265.39 ms. Allocated memory is still 96.5 MB. Free memory was 59.1 MB in the beginning and 67.4 MB in the end (delta: -8.3 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2021-10-11 00:21:36,315 INFO L168 Benchmark]: Boogie Procedure Inliner took 39.99 ms. Allocated memory is still 96.5 MB. Free memory was 67.4 MB in the beginning and 66.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-11 00:21:36,316 INFO L168 Benchmark]: Boogie Preprocessor took 28.11 ms. Allocated memory is still 96.5 MB. Free memory was 66.0 MB in the beginning and 64.7 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-11 00:21:36,316 INFO L168 Benchmark]: RCFGBuilder took 423.14 ms. Allocated memory is still 96.5 MB. Free memory was 64.4 MB in the beginning and 45.9 MB in the end (delta: 18.5 MB). Peak memory consumption was 18.9 MB. Max. memory is 16.1 GB. [2021-10-11 00:21:36,317 INFO L168 Benchmark]: TraceAbstraction took 2067.41 ms. Allocated memory was 96.5 MB in the beginning and 121.6 MB in the end (delta: 25.2 MB). Free memory was 45.5 MB in the beginning and 66.0 MB in the end (delta: -20.5 MB). Peak memory consumption was 7.5 MB. Max. memory is 16.1 GB. [2021-10-11 00:21:36,318 INFO L168 Benchmark]: Witness Printer took 77.63 ms. Allocated memory is still 121.6 MB. Free memory was 66.0 MB in the beginning and 62.8 MB in the end (delta: 3.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2021-10-11 00:21:36,321 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.56 ms. Allocated memory is still 96.5 MB. Free memory is still 75.5 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 265.39 ms. Allocated memory is still 96.5 MB. Free memory was 59.1 MB in the beginning and 67.4 MB in the end (delta: -8.3 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 39.99 ms. Allocated memory is still 96.5 MB. Free memory was 67.4 MB in the beginning and 66.0 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 28.11 ms. Allocated memory is still 96.5 MB. Free memory was 66.0 MB in the beginning and 64.7 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 423.14 ms. Allocated memory is still 96.5 MB. Free memory was 64.4 MB in the beginning and 45.9 MB in the end (delta: 18.5 MB). Peak memory consumption was 18.9 MB. Max. memory is 16.1 GB. * TraceAbstraction took 2067.41 ms. Allocated memory was 96.5 MB in the beginning and 121.6 MB in the end (delta: 25.2 MB). Free memory was 45.5 MB in the beginning and 66.0 MB in the end (delta: -20.5 MB). Peak memory consumption was 7.5 MB. Max. memory is 16.1 GB. * Witness Printer took 77.63 ms. Allocated memory is still 121.6 MB. Free memory was 66.0 MB in the beginning and 62.8 MB in the end (delta: 3.2 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: 11]: a call to reach_error is reachable a call to reach_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 [L11] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 40 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.9s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 0.7s, 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=40occurred 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...