/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/verifythis/tree_max_incorrect.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-36cd7be [2021-02-23 22:59:19,802 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-23 22:59:19,805 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-23 22:59:19,842 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-02-23 22:59:19,854 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-23 22:59:19,856 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-23 22:59:19,857 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-23 22:59:19,858 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-23 22:59:19,874 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-23 22:59:19,875 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-23 22:59:19,877 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-23 22:59:19,880 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-23 22:59:19,881 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-23 22:59:19,883 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-23 22:59:19,884 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-23 22:59:19,885 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-23 22:59:19,888 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-02-23 22:59:19,897 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-23 22:59:19,898 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-23 22:59:19,899 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-23 22:59:19,900 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2021-02-23 22:59:19,913 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-23 22:59:19,914 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-23 22:59:19,915 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-23 22:59:19,916 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-23 22:59:19,916 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-23 22:59:19,916 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-23 22:59:19,916 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-23 22:59:19,916 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-23 22:59:19,917 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-23 22:59:19,917 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-23 22:59:19,917 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-23 22:59:19,917 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-23 22:59:19,917 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-23 22:59:19,918 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-23 22:59:19,918 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-23 22:59:19,918 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-23 22:59:19,918 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-23 22:59:19,918 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-23 22:59:19,919 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-23 22:59:19,919 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-23 22:59:19,919 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-23 22:59:19,919 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-23 22:59:19,919 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2021-02-23 22:59:20,298 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-23 22:59:20,326 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-23 22:59:20,330 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-23 22:59:20,331 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-23 22:59:20,332 INFO L275 PluginConnector]: CDTParser initialized [2021-02-23 22:59:20,333 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_max_incorrect.c [2021-02-23 22:59:20,430 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f5e4ea916/b0686782974e44d09653b2a283486ff5/FLAGa3c9df2f2 [2021-02-23 22:59:21,098 INFO L306 CDTParser]: Found 1 translation units. [2021-02-23 22:59:21,099 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/verifythis/tree_max_incorrect.c [2021-02-23 22:59:21,108 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f5e4ea916/b0686782974e44d09653b2a283486ff5/FLAGa3c9df2f2 [2021-02-23 22:59:21,443 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f5e4ea916/b0686782974e44d09653b2a283486ff5 [2021-02-23 22:59:21,448 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-23 22:59:21,463 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-23 22:59:21,465 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-23 22:59:21,465 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-23 22:59:21,470 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-23 22:59:21,471 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 10:59:21" (1/1) ... [2021-02-23 22:59:21,472 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1fd0640 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:59:21, skipping insertion in model container [2021-02-23 22:59:21,472 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 10:59:21" (1/1) ... [2021-02-23 22:59:21,482 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-23 22:59:21,499 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-23 22:59:21,656 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/verifythis/tree_max_incorrect.c[466,479] [2021-02-23 22:59:21,677 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-23 22:59:21,692 INFO L203 MainTranslator]: Completed pre-run [2021-02-23 22:59:21,707 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/verifythis/tree_max_incorrect.c[466,479] [2021-02-23 22:59:21,716 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-23 22:59:21,737 INFO L208 MainTranslator]: Completed translation [2021-02-23 22:59:21,737 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:59:21 WrapperNode [2021-02-23 22:59:21,738 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-23 22:59:21,739 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-23 22:59:21,739 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-23 22:59:21,739 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-23 22:59:21,753 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:59:21" (1/1) ... [2021-02-23 22:59:21,754 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:59:21" (1/1) ... [2021-02-23 22:59:21,763 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:59:21" (1/1) ... [2021-02-23 22:59:21,763 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:59:21" (1/1) ... [2021-02-23 22:59:21,774 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:59:21" (1/1) ... [2021-02-23 22:59:21,777 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:59:21" (1/1) ... [2021-02-23 22:59:21,779 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:59:21" (1/1) ... [2021-02-23 22:59:21,782 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-23 22:59:21,783 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-23 22:59:21,784 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-23 22:59:21,784 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-23 22:59:21,785 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:59:21" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-23 22:59:21,886 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-23 22:59:21,887 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-23 22:59:21,887 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-23 22:59:21,887 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-02-23 22:59:21,888 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2021-02-23 22:59:21,888 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2021-02-23 22:59:21,888 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2021-02-23 22:59:21,888 INFO L138 BoogieDeclarations]: Found implementation of procedure task [2021-02-23 22:59:21,888 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-23 22:59:21,889 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2021-02-23 22:59:21,889 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-02-23 22:59:21,889 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-02-23 22:59:21,889 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2021-02-23 22:59:21,889 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-23 22:59:21,890 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-23 22:59:21,890 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-23 22:59:21,890 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-23 22:59:21,890 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-02-23 22:59:21,890 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2021-02-23 22:59:21,891 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-02-23 22:59:21,891 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-23 22:59:21,891 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-02-23 22:59:21,891 INFO L130 BoogieDeclarations]: Found specification of procedure max [2021-02-23 22:59:21,891 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-02-23 22:59:21,892 INFO L130 BoogieDeclarations]: Found specification of procedure check [2021-02-23 22:59:21,892 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-23 22:59:21,892 INFO L130 BoogieDeclarations]: Found specification of procedure task [2021-02-23 22:59:21,892 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-23 22:59:21,892 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-23 22:59:21,892 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-23 22:59:21,893 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-23 22:59:21,893 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-23 22:59:22,377 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-23 22:59:22,378 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-02-23 22:59:22,381 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 10:59:22 BoogieIcfgContainer [2021-02-23 22:59:22,381 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-23 22:59:22,387 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-23 22:59:22,387 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-23 22:59:22,391 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-23 22:59:22,391 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.02 10:59:21" (1/3) ... [2021-02-23 22:59:22,392 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4abdacc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 10:59:22, skipping insertion in model container [2021-02-23 22:59:22,393 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 10:59:21" (2/3) ... [2021-02-23 22:59:22,394 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4abdacc2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 10:59:22, skipping insertion in model container [2021-02-23 22:59:22,394 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 10:59:22" (3/3) ... [2021-02-23 22:59:22,396 INFO L111 eAbstractionObserver]: Analyzing ICFG tree_max_incorrect.c [2021-02-23 22:59:22,410 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-23 22:59:22,418 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-23 22:59:22,441 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-23 22:59:22,482 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-23 22:59:22,482 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-23 22:59:22,482 INFO L378 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2021-02-23 22:59:22,483 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-23 22:59:22,483 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-23 22:59:22,483 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-23 22:59:22,483 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-23 22:59:22,483 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-23 22:59:22,516 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states. [2021-02-23 22:59:22,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-02-23 22:59:22,535 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 22:59:22,537 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 22:59:22,537 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 22:59:22,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 22:59:22,550 INFO L82 PathProgramCache]: Analyzing trace with hash -1122945152, now seen corresponding path program 1 times [2021-02-23 22:59:22,564 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 22:59:22,565 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1182987967] [2021-02-23 22:59:22,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 22:59:22,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:59:22,948 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:22,950 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:59:22,960 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:22,961 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:59:22,987 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:22,988 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:59:22,999 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:23,000 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:59:23,012 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:23,013 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:59:23,027 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:23,029 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-02-23 22:59:23,042 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:23,043 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:59:23,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 22:59:23,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:59:23,099 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:23,100 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:59:23,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-02-23 22:59:23,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:59:23,153 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:23,154 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:59:23,156 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:23,157 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 13 [2021-02-23 22:59:23,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-02-23 22:59:23,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:59:23,191 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:23,192 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:59:23,204 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 22:59:23,205 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1182987967] [2021-02-23 22:59:23,208 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 22:59:23,208 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-02-23 22:59:23,209 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115449214] [2021-02-23 22:59:23,216 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-02-23 22:59:23,216 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 22:59:23,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-02-23 22:59:23,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2021-02-23 22:59:23,237 INFO L87 Difference]: Start difference. First operand 89 states. Second operand 10 states. [2021-02-23 22:59:24,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 22:59:24,450 INFO L93 Difference]: Finished difference Result 140 states and 166 transitions. [2021-02-23 22:59:24,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-02-23 22:59:24,453 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 38 [2021-02-23 22:59:24,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 22:59:24,473 INFO L225 Difference]: With dead ends: 140 [2021-02-23 22:59:24,474 INFO L226 Difference]: Without dead ends: 79 [2021-02-23 22:59:24,484 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2021-02-23 22:59:24,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-02-23 22:59:24,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-02-23 22:59:24,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2021-02-23 22:59:24,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 88 transitions. [2021-02-23 22:59:24,587 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 88 transitions. Word has length 38 [2021-02-23 22:59:24,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 22:59:24,589 INFO L480 AbstractCegarLoop]: Abstraction has 79 states and 88 transitions. [2021-02-23 22:59:24,589 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2021-02-23 22:59:24,590 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 88 transitions. [2021-02-23 22:59:24,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-02-23 22:59:24,597 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 22:59:24,597 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 22:59:24,598 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-23 22:59:24,598 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 22:59:24,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 22:59:24,600 INFO L82 PathProgramCache]: Analyzing trace with hash 1310698435, now seen corresponding path program 1 times [2021-02-23 22:59:24,601 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 22:59:24,602 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1577626764] [2021-02-23 22:59:24,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 22:59:24,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:59:24,746 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:24,747 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:59:24,748 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:24,748 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-23 22:59:24,752 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:24,753 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-23 22:59:24,757 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:24,757 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-02-23 22:59:24,762 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:24,763 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:59:24,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 22:59:24,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:59:24,809 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:24,811 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:59:24,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 12 [2021-02-23 22:59:24,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:59:24,933 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:24,934 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:59:24,940 WARN L141 QuantifierPusher]: treesize reduction 1, result has 90.0 percent of original size [2021-02-23 22:59:24,941 WARN L147 QuantifierPusher]: treesize reduction 1, result has 90.0 percent of original size 9 [2021-02-23 22:59:24,956 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:24,957 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-02-23 22:59:24,976 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:24,979 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-02-23 22:59:24,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 7 [2021-02-23 22:59:25,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:59:25,017 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:25,018 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:59:25,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-02-23 22:59:25,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:59:25,032 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:25,033 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 22:59:25,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-02-23 22:59:25,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 22:59:25,051 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:25,052 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 22:59:25,066 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 22:59:25,066 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 22:59:25,092 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-02-23 22:59:25,093 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1577626764] [2021-02-23 22:59:25,093 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 22:59:25,093 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-02-23 22:59:25,093 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227407417] [2021-02-23 22:59:25,096 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-02-23 22:59:25,096 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 22:59:25,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-02-23 22:59:25,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-02-23 22:59:25,097 INFO L87 Difference]: Start difference. First operand 79 states and 88 transitions. Second operand 12 states. [2021-02-23 22:59:25,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 22:59:25,785 INFO L93 Difference]: Finished difference Result 104 states and 116 transitions. [2021-02-23 22:59:25,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-02-23 22:59:25,786 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 59 [2021-02-23 22:59:25,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 22:59:25,789 INFO L225 Difference]: With dead ends: 104 [2021-02-23 22:59:25,789 INFO L226 Difference]: Without dead ends: 81 [2021-02-23 22:59:25,791 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=279, Unknown=0, NotChecked=0, Total=342 [2021-02-23 22:59:25,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-02-23 22:59:25,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2021-02-23 22:59:25,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2021-02-23 22:59:25,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 91 transitions. [2021-02-23 22:59:25,815 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 91 transitions. Word has length 59 [2021-02-23 22:59:25,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 22:59:25,816 INFO L480 AbstractCegarLoop]: Abstraction has 81 states and 91 transitions. [2021-02-23 22:59:25,816 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2021-02-23 22:59:25,816 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 91 transitions. [2021-02-23 22:59:25,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-02-23 22:59:25,820 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 22:59:25,820 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 22:59:25,821 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-23 22:59:25,821 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 22:59:25,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 22:59:25,821 INFO L82 PathProgramCache]: Analyzing trace with hash -1764932220, now seen corresponding path program 1 times [2021-02-23 22:59:25,822 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 22:59:25,822 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [884353605] [2021-02-23 22:59:25,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 22:59:25,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-23 22:59:25,863 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-23 22:59:25,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-23 22:59:25,902 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-23 22:59:25,954 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-02-23 22:59:25,954 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-23 22:59:25,955 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-02-23 22:59:26,042 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.02 10:59:26 BoogieIcfgContainer [2021-02-23 22:59:26,043 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-23 22:59:26,045 INFO L168 Benchmark]: Toolchain (without parser) took 4593.72 ms. Allocated memory was 180.4 MB in the beginning and 224.4 MB in the end (delta: 44.0 MB). Free memory was 156.9 MB in the beginning and 126.6 MB in the end (delta: 30.3 MB). Peak memory consumption was 75.6 MB. Max. memory is 8.0 GB. [2021-02-23 22:59:26,045 INFO L168 Benchmark]: CDTParser took 1.01 ms. Allocated memory is still 180.4 MB. Free memory is still 153.4 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-02-23 22:59:26,046 INFO L168 Benchmark]: CACSL2BoogieTranslator took 273.15 ms. Allocated memory is still 180.4 MB. Free memory was 155.8 MB in the beginning and 145.7 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2021-02-23 22:59:26,047 INFO L168 Benchmark]: Boogie Preprocessor took 43.34 ms. Allocated memory is still 180.4 MB. Free memory was 145.7 MB in the beginning and 144.0 MB in the end (delta: 1.7 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-02-23 22:59:26,048 INFO L168 Benchmark]: RCFGBuilder took 597.88 ms. Allocated memory is still 180.4 MB. Free memory was 144.0 MB in the beginning and 152.3 MB in the end (delta: -8.2 MB). Peak memory consumption was 17.9 MB. Max. memory is 8.0 GB. [2021-02-23 22:59:26,049 INFO L168 Benchmark]: TraceAbstraction took 3656.47 ms. Allocated memory was 180.4 MB in the beginning and 224.4 MB in the end (delta: 44.0 MB). Free memory was 152.3 MB in the beginning and 126.6 MB in the end (delta: 25.7 MB). Peak memory consumption was 69.2 MB. Max. memory is 8.0 GB. [2021-02-23 22:59:26,052 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.01 ms. Allocated memory is still 180.4 MB. Free memory is still 153.4 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 273.15 ms. Allocated memory is still 180.4 MB. Free memory was 155.8 MB in the beginning and 145.7 MB in the end (delta: 10.0 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 43.34 ms. Allocated memory is still 180.4 MB. Free memory was 145.7 MB in the beginning and 144.0 MB in the end (delta: 1.7 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 597.88 ms. Allocated memory is still 180.4 MB. Free memory was 144.0 MB in the beginning and 152.3 MB in the end (delta: -8.2 MB). Peak memory consumption was 17.9 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3656.47 ms. Allocated memory was 180.4 MB in the beginning and 224.4 MB in the end (delta: 44.0 MB). Free memory was 152.3 MB in the beginning and 126.6 MB in the end (delta: 25.7 MB). Peak memory consumption was 69.2 MB. Max. memory is 8.0 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, EXPR nondet_tree() [L20] COND FALSE !(__VERIFIER_nondet_bool()) VAL [__VERIFIER_nondet_bool()=0] [L23] struct node *n = (struct node *)malloc(sizeof(struct node)); VAL [malloc(sizeof(struct node))={-1:0}, n={-1:0}] [L24] n->data = __VERIFIER_nondet_int() VAL [__VERIFIER_nondet_int()=-2147483647, malloc(sizeof(struct node))={-1:0}, n={-1:0}] [L25] CALL, EXPR nondet_tree() [L20] COND TRUE __VERIFIER_nondet_bool() VAL [__VERIFIER_nondet_bool()=1] [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() VAL [malloc(sizeof(struct node))={-1:0}, n={-1:0}, nondet_tree()={0:0}] [L26] CALL, EXPR nondet_tree() [L20] COND TRUE __VERIFIER_nondet_bool() VAL [__VERIFIER_nondet_bool()=1] [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() VAL [malloc(sizeof(struct node))={-1:0}, n={-1:0}, nondet_tree()={0:0}] [L27] return n; VAL [\result={-1:0}, malloc(sizeof(struct node))={-1:0}, n={-1:0}] [L60] RET, EXPR nondet_tree() VAL [nondet_tree()={-1:0}] [L60] CALL task(nondet_tree()) VAL [n={-1:0}] [L55] CALL, EXPR max(n) VAL [n={-1:0}] [L32] COND FALSE !(!n) VAL [n={-1:0}, n={-1:0}] [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 VAL [n={0:0}, n={0:0}] [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); VAL [a=-2147483648, max(n->left)=-2147483648, n={-1:0}, n={-1:0}, n->left={0:0}] [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 VAL [n={0:0}, n={0:0}] [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); VAL [a=-2147483648, b=-2147483648, max(n->right)=-2147483648, n={-1:0}, n={-1:0}, n->right={0:0}] [L37] COND TRUE a >= b VAL [a=-2147483648, b=-2147483648, n={-1:0}, n={-1:0}] [L37] return a; VAL [\result=-2147483648, a=-2147483648, b=-2147483648, n={-1:0}, n={-1:0}] [L55] RET, EXPR max(n) VAL [max(n)=-2147483648, n={-1:0}, n={-1:0}] [L55] int a = max(n); VAL [a=-2147483648, max(n)=-2147483648, n={-1:0}, n={-1:0}] [L56] CALL check(n, a) VAL [\old(a)=-2147483648, n={-1:0}] [L43] COND TRUE \read(*n) VAL [\old(a)=-2147483648, a=-2147483648, n={-1:0}, n={-1:0}] [L44] EXPR n->data VAL [\old(a)=-2147483648, a=-2147483648, n={-1:0}, n={-1:0}, n->data=-2147483647] [L44] CALL __VERIFIER_assert(n->data <= a) VAL [\old(cond)=0] [L11] COND TRUE !cond VAL [\old(cond)=0, cond=0] [L11] reach_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 9 procedures, 92 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.4s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 1.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 149 SDtfs, 269 SDslu, 444 SDs, 0 SdLazy, 941 SolverSat, 107 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 51 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=89occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 2 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 179 NumberOfCodeBlocks, 179 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 95 ConstructedInterpolants, 0 QuantifiedInterpolants, 20874 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 2 InterpolantComputations, 2 PerfectInterpolantSequences, 11/11 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...