/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/list-ext2-properties/simple_and_skiplist_2lvl-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-dcfa08f [2020-12-23 06:26:17,425 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-23 06:26:17,428 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-23 06:26:17,468 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-23 06:26:17,469 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-23 06:26:17,471 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-23 06:26:17,474 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-23 06:26:17,476 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-23 06:26:17,479 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-23 06:26:17,481 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-23 06:26:17,483 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-23 06:26:17,485 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-23 06:26:17,486 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-23 06:26:17,487 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-23 06:26:17,489 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-23 06:26:17,491 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-23 06:26:17,493 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-23 06:26:17,523 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-23 06:26:17,528 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-23 06:26:17,534 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-23 06:26:17,537 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-23 06:26:17,539 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-23 06:26:17,541 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-23 06:26:17,542 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-23 06:26:17,545 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-23 06:26:17,546 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-23 06:26:17,546 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-23 06:26:17,548 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-23 06:26:17,549 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-23 06:26:17,550 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-23 06:26:17,550 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-23 06:26:17,551 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-23 06:26:17,558 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-23 06:26:17,559 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-23 06:26:17,563 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-23 06:26:17,563 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-23 06:26:17,564 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-23 06:26:17,564 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-23 06:26:17,565 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-23 06:26:17,566 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-23 06:26:17,571 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-23 06:26:17,574 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-23 06:26:17,637 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-23 06:26:17,638 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-23 06:26:17,643 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-23 06:26:17,643 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-23 06:26:17,643 INFO L138 SettingsManager]: * Use SBE=true [2020-12-23 06:26:17,644 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-23 06:26:17,645 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-23 06:26:17,646 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-23 06:26:17,646 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-23 06:26:17,646 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-23 06:26:17,648 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-23 06:26:17,648 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-23 06:26:17,648 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-23 06:26:17,649 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-23 06:26:17,649 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-23 06:26:17,649 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-23 06:26:17,650 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-23 06:26:17,650 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-23 06:26:17,650 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-23 06:26:17,651 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-23 06:26:17,651 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-23 06:26:17,651 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-23 06:26:17,651 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-23 06:26:17,652 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-23 06:26:17,652 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-23 06:26:17,652 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:/storage/repos/ultimate-bitabs/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-23 06:26:18,101 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-23 06:26:18,132 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-23 06:26:18,136 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-23 06:26:18,138 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-23 06:26:18,140 INFO L275 PluginConnector]: CDTParser initialized [2020-12-23 06:26:18,141 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/list-ext2-properties/simple_and_skiplist_2lvl-1.i [2020-12-23 06:26:18,242 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/4ffae3d52/790285724ba1493b878822afd0137128/FLAGc5094abd0 [2020-12-23 06:26:19,156 INFO L306 CDTParser]: Found 1 translation units. [2020-12-23 06:26:19,158 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/list-ext2-properties/simple_and_skiplist_2lvl-1.i [2020-12-23 06:26:19,186 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/4ffae3d52/790285724ba1493b878822afd0137128/FLAGc5094abd0 [2020-12-23 06:26:19,425 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/4ffae3d52/790285724ba1493b878822afd0137128 [2020-12-23 06:26:19,429 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-23 06:26:19,432 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-23 06:26:19,436 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-23 06:26:19,436 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-23 06:26:19,441 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-23 06:26:19,442 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 06:26:19" (1/1) ... [2020-12-23 06:26:19,444 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2362ae25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:26:19, skipping insertion in model container [2020-12-23 06:26:19,445 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.12 06:26:19" (1/1) ... [2020-12-23 06:26:19,455 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-23 06:26:19,498 INFO L178 MainTranslator]: Built tables and reachable declarations left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~sl~0,],base],StructAccessExpression[IdentifierExpression[~sl~0,],offset]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~sl~0,],base],BinaryExpression[ARITHPLUS,IntegerLiteral[8],StructAccessExpression[IdentifierExpression[~sl~0,],offset]]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[#t~mem10,],base],StructAccessExpression[IdentifierExpression[#t~mem10,],offset]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[#t~mem9,],base],BinaryExpression[ARITHPLUS,IntegerLiteral[8],StructAccessExpression[IdentifierExpression[#t~mem9,],offset]]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[#t~mem13,],base],StructAccessExpression[IdentifierExpression[#t~mem13,],offset]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[#t~mem12,],base],BinaryExpression[ARITHPLUS,IntegerLiteral[8],StructAccessExpression[IdentifierExpression[#t~mem12,],offset]]]] left hand side expression in assignment: lhs: VariableLHS[~a2~0,] left hand side expression in assignment: lhs: VariableLHS[~a2~0,] left hand side expression in assignment: lhs: VariableLHS[~a1~0,] left hand side expression in assignment: lhs: VariableLHS[~a1~0,] left hand side expression in assignment: lhs: VariableLHS[~new~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~new~0,],base],StructAccessExpression[IdentifierExpression[~new~0,],offset]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~a1~0,],base],StructAccessExpression[IdentifierExpression[~a1~0,],offset]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~new~0,],base],BinaryExpression[ARITHPLUS,IntegerLiteral[8],StructAccessExpression[IdentifierExpression[~new~0,],offset]]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~a2~0,],base],BinaryExpression[ARITHPLUS,IntegerLiteral[8],StructAccessExpression[IdentifierExpression[~a2~0,],offset]]]] left hand side expression in assignment: lhs: VariableLHS[~tmp~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~sl,],base],StructAccessExpression[IdentifierExpression[~sl,],offset]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~a~0,],base],StructAccessExpression[IdentifierExpression[~a~0,],offset]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~p~0,],base],StructAccessExpression[IdentifierExpression[~p~0,],offset]]] left hand side expression in assignment: lhs: VariableLHS[~t~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~p~0,],base],BinaryExpression[ARITHPLUS,IntegerLiteral[4],StructAccessExpression[IdentifierExpression[~p~0,],offset]]]] left hand side expression in assignment: lhs: VariableLHS[~p~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~p~0,],base],StructAccessExpression[IdentifierExpression[~p~0,],offset]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~p~0,],base],BinaryExpression[ARITHPLUS,IntegerLiteral[4],StructAccessExpression[IdentifierExpression[~p~0,],offset]]]] left hand side expression in assignment: lhs: VariableLHS[~p~0,] [2020-12-23 06:26:19,986 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/list-ext2-properties/simple_and_skiplist_2lvl-1.i[24032,24045] left hand side expression in assignment: lhs: VariableLHS[~p~0,] [2020-12-23 06:26:19,993 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 06:26:20,007 INFO L203 MainTranslator]: Completed pre-run left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~sl~0,],base],StructAccessExpression[IdentifierExpression[~sl~0,],offset]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~sl~0,],base],BinaryExpression[ARITHPLUS,IntegerLiteral[8],StructAccessExpression[IdentifierExpression[~sl~0,],offset]]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[#t~mem10,],base],StructAccessExpression[IdentifierExpression[#t~mem10,],offset]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[#t~mem9,],base],BinaryExpression[ARITHPLUS,IntegerLiteral[8],StructAccessExpression[IdentifierExpression[#t~mem9,],offset]]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[#t~mem13,],base],StructAccessExpression[IdentifierExpression[#t~mem13,],offset]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[#t~mem12,],base],BinaryExpression[ARITHPLUS,IntegerLiteral[8],StructAccessExpression[IdentifierExpression[#t~mem12,],offset]]]] left hand side expression in assignment: lhs: VariableLHS[~a2~0,] left hand side expression in assignment: lhs: VariableLHS[~a2~0,] left hand side expression in assignment: lhs: VariableLHS[~a1~0,] left hand side expression in assignment: lhs: VariableLHS[~a1~0,] left hand side expression in assignment: lhs: VariableLHS[~new~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~new~0,],base],StructAccessExpression[IdentifierExpression[~new~0,],offset]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~a1~0,],base],StructAccessExpression[IdentifierExpression[~a1~0,],offset]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~new~0,],base],BinaryExpression[ARITHPLUS,IntegerLiteral[8],StructAccessExpression[IdentifierExpression[~new~0,],offset]]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~a2~0,],base],BinaryExpression[ARITHPLUS,IntegerLiteral[8],StructAccessExpression[IdentifierExpression[~a2~0,],offset]]]] left hand side expression in assignment: lhs: VariableLHS[~tmp~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~sl,],base],StructAccessExpression[IdentifierExpression[~sl,],offset]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~a~0,],base],StructAccessExpression[IdentifierExpression[~a~0,],offset]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~p~0,],base],StructAccessExpression[IdentifierExpression[~p~0,],offset]]] left hand side expression in assignment: lhs: VariableLHS[~t~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~p~0,],base],BinaryExpression[ARITHPLUS,IntegerLiteral[4],StructAccessExpression[IdentifierExpression[~p~0,],offset]]]] left hand side expression in assignment: lhs: VariableLHS[~p~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~p~0,],base],StructAccessExpression[IdentifierExpression[~p~0,],offset]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~p~0,],base],BinaryExpression[ARITHPLUS,IntegerLiteral[4],StructAccessExpression[IdentifierExpression[~p~0,],offset]]]] left hand side expression in assignment: lhs: VariableLHS[~p~0,] [2020-12-23 06:26:20,075 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/list-ext2-properties/simple_and_skiplist_2lvl-1.i[24032,24045] left hand side expression in assignment: lhs: VariableLHS[~p~0,] [2020-12-23 06:26:20,078 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-23 06:26:20,213 INFO L208 MainTranslator]: Completed translation [2020-12-23 06:26:20,214 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:26:20 WrapperNode [2020-12-23 06:26:20,214 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-23 06:26:20,218 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-23 06:26:20,219 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-23 06:26:20,219 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-23 06:26:20,237 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:26:20" (1/1) ... [2020-12-23 06:26:20,259 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:26:20" (1/1) ... [2020-12-23 06:26:20,296 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-23 06:26:20,298 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-23 06:26:20,298 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-23 06:26:20,298 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-23 06:26:20,312 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:26:20" (1/1) ... [2020-12-23 06:26:20,312 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:26:20" (1/1) ... [2020-12-23 06:26:20,319 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:26:20" (1/1) ... [2020-12-23 06:26:20,320 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:26:20" (1/1) ... [2020-12-23 06:26:20,333 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:26:20" (1/1) ... [2020-12-23 06:26:20,340 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:26:20" (1/1) ... [2020-12-23 06:26:20,346 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:26:20" (1/1) ... [2020-12-23 06:26:20,356 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-23 06:26:20,357 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-23 06:26:20,357 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-23 06:26:20,357 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-23 06:26:20,364 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:26:20" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/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 [2020-12-23 06:26:20,505 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-23 06:26:20,506 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-23 06:26:20,506 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-12-23 06:26:20,506 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-12-23 06:26:20,506 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-23 06:26:20,507 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-12-23 06:26:20,507 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-23 06:26:20,507 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-23 06:26:20,507 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-23 06:26:20,507 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-23 06:26:21,331 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-23 06:26:21,331 INFO L299 CfgBuilder]: Removed 20 assume(true) statements. [2020-12-23 06:26:21,333 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 06:26:21 BoogieIcfgContainer [2020-12-23 06:26:21,334 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-23 06:26:21,336 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-23 06:26:21,336 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-23 06:26:21,341 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-23 06:26:21,342 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.12 06:26:19" (1/3) ... [2020-12-23 06:26:21,342 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66417c7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 06:26:21, skipping insertion in model container [2020-12-23 06:26:21,343 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.12 06:26:20" (2/3) ... [2020-12-23 06:26:21,343 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66417c7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.12 06:26:21, skipping insertion in model container [2020-12-23 06:26:21,343 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 06:26:21" (3/3) ... [2020-12-23 06:26:21,346 INFO L111 eAbstractionObserver]: Analyzing ICFG simple_and_skiplist_2lvl-1.i [2020-12-23 06:26:21,354 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-23 06:26:21,361 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-23 06:26:21,388 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-23 06:26:21,424 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-23 06:26:21,424 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-23 06:26:21,424 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-23 06:26:21,424 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-23 06:26:21,425 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-23 06:26:21,425 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-23 06:26:21,425 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-23 06:26:21,425 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-23 06:26:21,443 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states. [2020-12-23 06:26:21,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-23 06:26:21,451 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:26:21,452 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:26:21,452 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:26:21,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:26:21,460 INFO L82 PathProgramCache]: Analyzing trace with hash 2114193284, now seen corresponding path program 1 times [2020-12-23 06:26:21,474 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:26:21,474 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233278370] [2020-12-23 06:26:21,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:26:21,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:26:21,669 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:26:21,670 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233278370] [2020-12-23 06:26:21,671 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 06:26:21,672 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-23 06:26:21,676 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786823725] [2020-12-23 06:26:21,682 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-12-23 06:26:21,682 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:26:21,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-12-23 06:26:21,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-23 06:26:21,704 INFO L87 Difference]: Start difference. First operand 37 states. Second operand 2 states. [2020-12-23 06:26:21,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:26:21,729 INFO L93 Difference]: Finished difference Result 64 states and 94 transitions. [2020-12-23 06:26:21,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-12-23 06:26:21,731 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 9 [2020-12-23 06:26:21,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:26:21,742 INFO L225 Difference]: With dead ends: 64 [2020-12-23 06:26:21,742 INFO L226 Difference]: Without dead ends: 14 [2020-12-23 06:26:21,746 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-12-23 06:26:21,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-12-23 06:26:21,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-12-23 06:26:21,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-23 06:26:21,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2020-12-23 06:26:21,791 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2020-12-23 06:26:21,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:26:21,791 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2020-12-23 06:26:21,792 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-12-23 06:26:21,792 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2020-12-23 06:26:21,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-23 06:26:21,793 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:26:21,793 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:26:21,793 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-23 06:26:21,794 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:26:21,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:26:21,795 INFO L82 PathProgramCache]: Analyzing trace with hash 672844787, now seen corresponding path program 1 times [2020-12-23 06:26:21,795 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:26:21,796 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309214087] [2020-12-23 06:26:21,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:26:21,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:26:21,936 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:26:21,937 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309214087] [2020-12-23 06:26:21,937 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-23 06:26:21,937 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-23 06:26:21,938 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307405613] [2020-12-23 06:26:21,939 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-23 06:26:21,940 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:26:21,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-23 06:26:21,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-23 06:26:21,942 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 5 states. [2020-12-23 06:26:22,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:26:22,072 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2020-12-23 06:26:22,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-23 06:26:22,073 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-12-23 06:26:22,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:26:22,074 INFO L225 Difference]: With dead ends: 29 [2020-12-23 06:26:22,074 INFO L226 Difference]: Without dead ends: 27 [2020-12-23 06:26:22,075 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-12-23 06:26:22,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-12-23 06:26:22,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 19. [2020-12-23 06:26:22,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-12-23 06:26:22,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-12-23 06:26:22,091 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 10 [2020-12-23 06:26:22,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:26:22,092 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-12-23 06:26:22,092 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-23 06:26:22,092 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-12-23 06:26:22,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-23 06:26:22,094 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:26:22,094 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:26:22,094 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-23 06:26:22,095 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:26:22,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:26:22,099 INFO L82 PathProgramCache]: Analyzing trace with hash 111486456, now seen corresponding path program 1 times [2020-12-23 06:26:22,100 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:26:22,100 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56719358] [2020-12-23 06:26:22,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:26:22,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:26:22,277 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:26:22,278 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56719358] [2020-12-23 06:26:22,278 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2135984440] [2020-12-23 06:26:22,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 06:26:22,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 06:26:22,421 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 21 conjunts are in the unsatisfiable core [2020-12-23 06:26:22,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 06:26:22,587 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2020-12-23 06:26:22,590 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 06:26:22,601 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 06:26:22,608 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2020-12-23 06:26:22,610 INFO L547 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2020-12-23 06:26:22,623 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 06:26:22,625 INFO L547 ElimStorePlain]: Start of recursive call 1: 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 06:26:22,625 INFO L244 ElimStorePlain]: Needed 3 recursive calls to eliminate 2 variables, input treesize:26, output treesize:18 [2020-12-23 06:26:22,677 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2020-12-23 06:26:22,679 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2020-12-23 06:26:22,688 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 06:26:22,691 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2020-12-23 06:26:22,693 INFO L547 ElimStorePlain]: Start of recursive call 3: End of recursive call: and 1 xjuncts. [2020-12-23 06:26:22,701 INFO L625 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2020-12-23 06:26:22,703 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 2 dim-2 vars, End of recursive call: and 1 xjuncts. [2020-12-23 06:26:22,703 INFO L244 ElimStorePlain]: Needed 3 recursive calls to eliminate 3 variables, input treesize:29, output treesize:7 [2020-12-23 06:26:22,710 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-23 06:26:22,711 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 06:26:22,711 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 6 [2020-12-23 06:26:22,711 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80563282] [2020-12-23 06:26:22,712 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-23 06:26:22,712 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 06:26:22,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-23 06:26:22,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-12-23 06:26:22,714 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 6 states. [2020-12-23 06:26:22,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 06:26:22,819 INFO L93 Difference]: Finished difference Result 33 states and 35 transitions. [2020-12-23 06:26:22,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-23 06:26:22,820 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-12-23 06:26:22,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 06:26:22,821 INFO L225 Difference]: With dead ends: 33 [2020-12-23 06:26:22,821 INFO L226 Difference]: Without dead ends: 23 [2020-12-23 06:26:22,823 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 12 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-12-23 06:26:22,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-12-23 06:26:22,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 16. [2020-12-23 06:26:22,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-23 06:26:22,829 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2020-12-23 06:26:22,829 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 13 [2020-12-23 06:26:22,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 06:26:22,830 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2020-12-23 06:26:22,830 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-23 06:26:22,830 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2020-12-23 06:26:22,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-12-23 06:26:22,831 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 06:26:22,831 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 06:26:23,046 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-23 06:26:23,047 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 06:26:23,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 06:26:23,048 INFO L82 PathProgramCache]: Analyzing trace with hash -1682540518, now seen corresponding path program 1 times [2020-12-23 06:26:23,048 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 06:26:23,049 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988333584] [2020-12-23 06:26:23,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 06:26:23,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-23 06:26:23,090 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-23 06:26:23,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-23 06:26:23,129 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-23 06:26:23,162 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-12-23 06:26:23,162 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-23 06:26:23,163 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-12-23 06:26:23,207 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.12 06:26:23 BoogieIcfgContainer [2020-12-23 06:26:23,207 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-23 06:26:23,208 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-23 06:26:23,208 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-23 06:26:23,209 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-23 06:26:23,210 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.12 06:26:21" (3/4) ... [2020-12-23 06:26:23,214 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-23 06:26:23,308 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/list-ext2-properties/simple_and_skiplist_2lvl-1.i-witness.graphml [2020-12-23 06:26:23,308 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-23 06:26:23,316 INFO L168 Benchmark]: Toolchain (without parser) took 3884.28 ms. Allocated memory was 162.5 MB in the beginning and 247.5 MB in the end (delta: 84.9 MB). Free memory was 137.3 MB in the beginning and 193.5 MB in the end (delta: -56.2 MB). Peak memory consumption was 28.9 MB. Max. memory is 8.0 GB. [2020-12-23 06:26:23,319 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 162.5 MB. Free memory is still 134.8 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-12-23 06:26:23,320 INFO L168 Benchmark]: CACSL2BoogieTranslator took 779.29 ms. Allocated memory is still 162.5 MB. Free memory was 136.9 MB in the beginning and 144.8 MB in the end (delta: -7.9 MB). Peak memory consumption was 25.7 MB. Max. memory is 8.0 GB. [2020-12-23 06:26:23,321 INFO L168 Benchmark]: Boogie Procedure Inliner took 78.63 ms. Allocated memory is still 162.5 MB. Free memory was 144.8 MB in the beginning and 142.7 MB in the end (delta: 2.1 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-23 06:26:23,324 INFO L168 Benchmark]: Boogie Preprocessor took 58.14 ms. Allocated memory is still 162.5 MB. Free memory was 142.7 MB in the beginning and 140.6 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-12-23 06:26:23,325 INFO L168 Benchmark]: RCFGBuilder took 976.81 ms. Allocated memory is still 162.5 MB. Free memory was 140.6 MB in the beginning and 108.6 MB in the end (delta: 32.0 MB). Peak memory consumption was 31.5 MB. Max. memory is 8.0 GB. [2020-12-23 06:26:23,326 INFO L168 Benchmark]: TraceAbstraction took 1871.36 ms. Allocated memory was 162.5 MB in the beginning and 247.5 MB in the end (delta: 84.9 MB). Free memory was 108.1 MB in the beginning and 195.6 MB in the end (delta: -87.5 MB). There was no memory consumed. Max. memory is 8.0 GB. [2020-12-23 06:26:23,332 INFO L168 Benchmark]: Witness Printer took 106.05 ms. Allocated memory is still 247.5 MB. Free memory was 195.6 MB in the beginning and 193.5 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-12-23 06:26:23,343 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 162.5 MB. Free memory is still 134.8 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 779.29 ms. Allocated memory is still 162.5 MB. Free memory was 136.9 MB in the beginning and 144.8 MB in the end (delta: -7.9 MB). Peak memory consumption was 25.7 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 78.63 ms. Allocated memory is still 162.5 MB. Free memory was 144.8 MB in the beginning and 142.7 MB in the end (delta: 2.1 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 58.14 ms. Allocated memory is still 162.5 MB. Free memory was 142.7 MB in the beginning and 140.6 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 976.81 ms. Allocated memory is still 162.5 MB. Free memory was 140.6 MB in the beginning and 108.6 MB in the end (delta: 32.0 MB). Peak memory consumption was 31.5 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1871.36 ms. Allocated memory was 162.5 MB in the beginning and 247.5 MB in the end (delta: 84.9 MB). Free memory was 108.1 MB in the beginning and 195.6 MB in the end (delta: -87.5 MB). There was no memory consumed. Max. memory is 8.0 GB. * Witness Printer took 106.05 ms. Allocated memory is still 247.5 MB. Free memory was 195.6 MB in the beginning and 193.5 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 613]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L596] List a = (List) malloc(sizeof(struct node)); [L597] COND FALSE !(a == 0) [L598] List t; [L599] List p = a; [L600] a->h = 2 [L601] COND TRUE __VERIFIER_nondet_int() [L602] p->h = 1 [L603] t = (List) malloc(sizeof(struct node)) [L604] COND FALSE !(t == 0) [L605] p->n = t [L606] EXPR p->n [L606] p = p->n [L601] COND FALSE !(__VERIFIER_nondet_int()) [L608] p->h = 2 [L609] p->n = 0 [L610] p = a [L611] COND TRUE p!=0 [L612] EXPR p->h [L612] COND TRUE p->h != 2 [L613] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 37 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.7s, OverallIterations: 4, TraceHistogramMax: 2, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 66 SDtfs, 30 SDslu, 47 SDs, 0 SdLazy, 59 SolverSat, 11 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=37occurred 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, 3 MinimizatonAttempts, 15 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 59 NumberOfCodeBlocks, 59 NumberOfCodeBlocksAsserted, 5 NumberOfCheckSat, 41 ConstructedInterpolants, 0 QuantifiedInterpolants, 3067 SizeOfPredicates, 6 NumberOfNonLiveVariables, 72 ConjunctsInSsa, 21 ConjunctsInUnsatCore, 4 InterpolantComputations, 2 PerfectInterpolantSequences, 2/4 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...