/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/verifythis/tree_max_incorrect.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 00:20:19,393 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 00:20:19,396 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 00:20:19,422 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 00:20:19,422 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 00:20:19,424 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 00:20:19,425 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 00:20:19,427 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 00:20:19,429 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 00:20:19,430 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 00:20:19,431 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 00:20:19,432 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 00:20:19,432 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 00:20:19,433 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 00:20:19,434 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 00:20:19,435 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 00:20:19,436 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 00:20:19,437 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 00:20:19,439 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 00:20:19,441 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 00:20:19,442 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 00:20:19,443 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 00:20:19,445 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 00:20:19,446 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 00:20:19,448 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-19 00:20:19,449 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-19 00:20:19,449 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-19 00:20:19,450 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-19 00:20:19,450 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-19 00:20:19,451 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-19 00:20:19,456 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 00:20:19,457 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 00:20:19,457 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 00:20:19,458 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 00:20:19,495 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 00:20:19,495 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 00:20:19,497 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 00:20:19,498 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 00:20:19,498 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 00:20:19,499 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 00:20:19,499 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 00:20:19,499 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 00:20:19,499 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 00:20:19,499 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 00:20:19,500 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 00:20:19,500 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 00:20:19,500 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 00:20:19,500 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 00:20:19,500 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 00:20:19,501 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 00:20:19,501 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 00:20:19,501 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 00:20:19,501 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 00:20:19,501 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 00:20:19,501 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 00:20:19,504 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 00:20:19,504 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 00:20:19,505 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 00:20:19,505 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 00:20:19,505 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 00:20:19,506 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 00:20:19,506 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 00:20:19,506 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 00:20:19,506 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES 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: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4; [2020-08-19 00:20:19,844 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 00:20:19,856 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 00:20:19,860 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 00:20:19,862 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 00:20:19,862 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 00:20:19,863 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/tree_max_incorrect.c [2020-08-19 00:20:19,924 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6d87af643/e2b590d2fa884a47b698b7042bada2a7/FLAGd7a515698 [2020-08-19 00:20:20,381 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 00:20:20,381 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/verifythis/tree_max_incorrect.c [2020-08-19 00:20:20,388 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6d87af643/e2b590d2fa884a47b698b7042bada2a7/FLAGd7a515698 [2020-08-19 00:20:20,720 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6d87af643/e2b590d2fa884a47b698b7042bada2a7 [2020-08-19 00:20:20,730 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 00:20:20,732 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 00:20:20,733 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 00:20:20,734 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 00:20:20,737 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 00:20:20,738 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 12:20:20" (1/1) ... [2020-08-19 00:20:20,741 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3386436d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:20:20, skipping insertion in model container [2020-08-19 00:20:20,742 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 12:20:20" (1/1) ... [2020-08-19 00:20:20,749 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 00:20:20,768 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 00:20:20,958 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 00:20:20,970 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 00:20:20,993 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 00:20:21,011 INFO L208 MainTranslator]: Completed translation [2020-08-19 00:20:21,012 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:20:21 WrapperNode [2020-08-19 00:20:21,012 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 00:20:21,013 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 00:20:21,013 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 00:20:21,013 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 00:20:21,107 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:20:21" (1/1) ... [2020-08-19 00:20:21,107 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:20:21" (1/1) ... [2020-08-19 00:20:21,118 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:20:21" (1/1) ... [2020-08-19 00:20:21,119 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:20:21" (1/1) ... [2020-08-19 00:20:21,132 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:20:21" (1/1) ... [2020-08-19 00:20:21,134 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:20:21" (1/1) ... [2020-08-19 00:20:21,136 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:20:21" (1/1) ... [2020-08-19 00:20:21,138 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 00:20:21,139 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 00:20:21,139 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 00:20:21,139 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 00:20:21,140 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:20:21" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 00:20:21,209 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 00:20:21,209 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 00:20:21,210 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 00:20:21,210 INFO L138 BoogieDeclarations]: Found implementation of procedure nondet_tree [2020-08-19 00:20:21,210 INFO L138 BoogieDeclarations]: Found implementation of procedure max [2020-08-19 00:20:21,210 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-19 00:20:21,210 INFO L138 BoogieDeclarations]: Found implementation of procedure task [2020-08-19 00:20:21,210 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 00:20:21,211 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-19 00:20:21,211 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-08-19 00:20:21,211 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 00:20:21,211 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_bool [2020-08-19 00:20:21,211 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 00:20:21,211 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 00:20:21,212 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_tree [2020-08-19 00:20:21,212 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-19 00:20:21,212 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-19 00:20:21,212 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-19 00:20:21,212 INFO L130 BoogieDeclarations]: Found specification of procedure max [2020-08-19 00:20:21,212 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-19 00:20:21,212 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-19 00:20:21,213 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-19 00:20:21,213 INFO L130 BoogieDeclarations]: Found specification of procedure task [2020-08-19 00:20:21,213 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 00:20:21,213 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 00:20:21,213 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 00:20:21,213 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-19 00:20:21,476 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 00:20:21,477 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-19 00:20:21,481 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 12:20:21 BoogieIcfgContainer [2020-08-19 00:20:21,481 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 00:20:21,482 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 00:20:21,482 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 00:20:21,485 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 00:20:21,486 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 12:20:20" (1/3) ... [2020-08-19 00:20:21,488 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@530dc6e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 12:20:21, skipping insertion in model container [2020-08-19 00:20:21,488 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 12:20:21" (2/3) ... [2020-08-19 00:20:21,488 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@530dc6e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 12:20:21, skipping insertion in model container [2020-08-19 00:20:21,489 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 12:20:21" (3/3) ... [2020-08-19 00:20:21,491 INFO L109 eAbstractionObserver]: Analyzing ICFG tree_max_incorrect.c [2020-08-19 00:20:21,506 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 00:20:21,514 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 00:20:21,533 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 00:20:21,562 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 00:20:21,562 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 00:20:21,562 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 00:20:21,563 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 00:20:21,563 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 00:20:21,563 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 00:20:21,563 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 00:20:21,563 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 00:20:21,591 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states. [2020-08-19 00:20:21,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 00:20:21,607 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:20:21,612 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] [2020-08-19 00:20:21,612 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:20:21,619 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:20:21,620 INFO L82 PathProgramCache]: Analyzing trace with hash 1628582097, now seen corresponding path program 1 times [2020-08-19 00:20:21,629 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:20:21,630 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [237156806] [2020-08-19 00:20:21,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:20:21,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:20:21,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:20:21,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:20:21,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 00:20:22,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:20:22,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-19 00:20:22,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:20:22,105 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 00:20:22,106 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [237156806] [2020-08-19 00:20:22,108 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 00:20:22,109 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-08-19 00:20:22,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193545642] [2020-08-19 00:20:22,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 00:20:22,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:20:22,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 00:20:22,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-19 00:20:22,135 INFO L87 Difference]: Start difference. First operand 51 states. Second operand 10 states. [2020-08-19 00:20:22,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:20:22,866 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2020-08-19 00:20:22,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 00:20:22,869 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-08-19 00:20:22,869 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:20:22,882 INFO L225 Difference]: With dead ends: 93 [2020-08-19 00:20:22,882 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 00:20:22,887 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2020-08-19 00:20:22,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 00:20:22,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-19 00:20:22,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-19 00:20:22,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 51 transitions. [2020-08-19 00:20:22,940 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 51 transitions. Word has length 24 [2020-08-19 00:20:22,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:20:22,941 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 51 transitions. [2020-08-19 00:20:22,941 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 00:20:22,941 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 51 transitions. [2020-08-19 00:20:22,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 00:20:22,944 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:20:22,945 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, 1, 1, 1, 1, 1, 1] [2020-08-19 00:20:22,945 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 00:20:22,945 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:20:22,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:20:22,946 INFO L82 PathProgramCache]: Analyzing trace with hash 1712930862, now seen corresponding path program 1 times [2020-08-19 00:20:22,946 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:20:22,947 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1084222242] [2020-08-19 00:20:22,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:20:22,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:20:23,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 00:20:23,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:20:23,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-19 00:20:23,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:20:23,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 1 [2020-08-19 00:20:23,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:20:23,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 00:20:23,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:20:23,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-19 00:20:23,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 00:20:23,298 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 00:20:23,298 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1084222242] [2020-08-19 00:20:23,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 00:20:23,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-08-19 00:20:23,299 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225606427] [2020-08-19 00:20:23,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 00:20:23,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 00:20:23,302 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 00:20:23,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-19 00:20:23,303 INFO L87 Difference]: Start difference. First operand 42 states and 51 transitions. Second operand 11 states. [2020-08-19 00:20:23,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 00:20:23,734 INFO L93 Difference]: Finished difference Result 59 states and 71 transitions. [2020-08-19 00:20:23,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 00:20:23,735 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 34 [2020-08-19 00:20:23,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 00:20:23,739 INFO L225 Difference]: With dead ends: 59 [2020-08-19 00:20:23,739 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 00:20:23,741 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-08-19 00:20:23,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 00:20:23,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-19 00:20:23,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 00:20:23,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 54 transitions. [2020-08-19 00:20:23,765 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 54 transitions. Word has length 34 [2020-08-19 00:20:23,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 00:20:23,769 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 54 transitions. [2020-08-19 00:20:23,769 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 00:20:23,769 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 54 transitions. [2020-08-19 00:20:23,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-19 00:20:23,773 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 00:20:23,774 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, 1, 1, 1, 1, 1, 1] [2020-08-19 00:20:23,774 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 00:20:23,774 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 00:20:23,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 00:20:23,775 INFO L82 PathProgramCache]: Analyzing trace with hash 27177221, now seen corresponding path program 1 times [2020-08-19 00:20:23,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 00:20:23,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2103998843] [2020-08-19 00:20:23,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 00:20:23,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-19 00:20:23,867 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-19 00:20:23,867 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-19 00:20:23,871 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 00:20:23,892 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.08 12:20:23 BoogieIcfgContainer [2020-08-19 00:20:23,892 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-19 00:20:23,896 INFO L168 Benchmark]: Toolchain (without parser) took 3162.48 ms. Allocated memory was 137.4 MB in the beginning and 252.2 MB in the end (delta: 114.8 MB). Free memory was 100.5 MB in the beginning and 210.1 MB in the end (delta: -109.6 MB). Peak memory consumption was 5.2 MB. Max. memory is 7.1 GB. [2020-08-19 00:20:23,897 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 137.4 MB. Free memory was 118.9 MB in the beginning and 118.7 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-19 00:20:23,898 INFO L168 Benchmark]: CACSL2BoogieTranslator took 279.14 ms. Allocated memory is still 137.4 MB. Free memory was 100.3 MB in the beginning and 89.9 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. [2020-08-19 00:20:23,899 INFO L168 Benchmark]: Boogie Preprocessor took 125.64 ms. Allocated memory was 137.4 MB in the beginning and 199.8 MB in the end (delta: 62.4 MB). Free memory was 89.9 MB in the beginning and 176.9 MB in the end (delta: -87.0 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. [2020-08-19 00:20:23,900 INFO L168 Benchmark]: RCFGBuilder took 342.34 ms. Allocated memory is still 199.8 MB. Free memory was 176.9 MB in the beginning and 156.2 MB in the end (delta: 20.7 MB). Peak memory consumption was 20.7 MB. Max. memory is 7.1 GB. [2020-08-19 00:20:23,901 INFO L168 Benchmark]: TraceAbstraction took 2410.26 ms. Allocated memory was 199.8 MB in the beginning and 252.2 MB in the end (delta: 52.4 MB). Free memory was 156.2 MB in the beginning and 210.1 MB in the end (delta: -53.9 MB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-19 00:20:23,904 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 137.4 MB. Free memory was 118.9 MB in the beginning and 118.7 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 279.14 ms. Allocated memory is still 137.4 MB. Free memory was 100.3 MB in the beginning and 89.9 MB in the end (delta: 10.4 MB). Peak memory consumption was 10.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 125.64 ms. Allocated memory was 137.4 MB in the beginning and 199.8 MB in the end (delta: 62.4 MB). Free memory was 89.9 MB in the beginning and 176.9 MB in the end (delta: -87.0 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 342.34 ms. Allocated memory is still 199.8 MB. Free memory was 176.9 MB in the beginning and 156.2 MB in the end (delta: 20.7 MB). Peak memory consumption was 20.7 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2410.26 ms. Allocated memory was 199.8 MB in the beginning and 252.2 MB in the end (delta: 52.4 MB). Free memory was 156.2 MB in the beginning and 210.1 MB in the end (delta: -53.9 MB). There was no memory consumed. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 9]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L58] CALL, EXPR nondet_tree() [L18] COND FALSE !(__VERIFIER_nondet_bool()) [L21] struct node *n = (struct node *)malloc(sizeof(struct node)); [L22] n->data = __VERIFIER_nondet_int() [L23] CALL, EXPR nondet_tree() [L18] COND TRUE __VERIFIER_nondet_bool() [L19] return 0; [L23] RET, EXPR nondet_tree() [L23] n->left = nondet_tree() [L24] CALL, EXPR nondet_tree() [L18] COND TRUE __VERIFIER_nondet_bool() [L19] return 0; [L24] RET, EXPR nondet_tree() [L24] n->right = nondet_tree() [L25] return n; [L58] RET, EXPR nondet_tree() [L58] CALL task(nondet_tree()) [L53] CALL, EXPR max(n) [L30] COND FALSE !(!n) [L33] EXPR n->left [L33] CALL, EXPR max(n->left) [L30] COND TRUE !n [L31] return -2147483648; [L33] RET, EXPR max(n->left) [L33] int a = max(n->left); [L34] EXPR n->right [L34] CALL, EXPR max(n->right) [L30] COND TRUE !n [L31] return -2147483648; [L34] RET, EXPR max(n->right) [L34] int b = max(n->right); [L35] COND TRUE a >= b [L35] return a; [L53] RET, EXPR max(n) [L53] int a = max(n); [L54] CALL check(n, a) [L41] COND TRUE \read(*n) [L42] EXPR n->data [L42] CALL __VERIFIER_assert(n->data <= a) [L9] COND TRUE !cond [L9] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 8 procedures, 51 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.3s, OverallIterations: 3, TraceHistogramMax: 3, AutomataDifference: 1.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 79 SDtfs, 141 SDslu, 268 SDs, 0 SdLazy, 527 SolverSat, 103 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 47 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=51occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 2 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.6s InterpolantComputationTime, 105 NumberOfCodeBlocks, 105 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 56 ConstructedInterpolants, 0 QuantifiedInterpolants, 6559 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...