/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/loops/nec20.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-178dd20 [2021-01-06 16:40:13,362 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-01-06 16:40:13,367 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-01-06 16:40:13,429 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-01-06 16:40:13,430 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-01-06 16:40:13,435 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-01-06 16:40:13,439 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-01-06 16:40:13,445 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-01-06 16:40:13,451 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-01-06 16:40:13,452 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-01-06 16:40:13,459 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-01-06 16:40:13,461 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-01-06 16:40:13,461 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-01-06 16:40:13,463 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-01-06 16:40:13,464 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-01-06 16:40:13,466 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-01-06 16:40:13,467 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-01-06 16:40:13,468 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-01-06 16:40:13,471 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-01-06 16:40:13,473 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-01-06 16:40:13,475 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-01-06 16:40:13,477 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-01-06 16:40:13,478 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-01-06 16:40:13,479 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-01-06 16:40:13,482 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-01-06 16:40:13,498 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-01-06 16:40:13,499 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-01-06 16:40:13,500 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-01-06 16:40:13,500 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-01-06 16:40:13,502 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-01-06 16:40:13,502 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-01-06 16:40:13,503 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-01-06 16:40:13,503 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-01-06 16:40:13,503 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-01-06 16:40:13,504 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-01-06 16:40:13,505 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-01-06 16:40:13,506 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2021-01-06 16:40:13,533 INFO L113 SettingsManager]: Loading preferences was successful [2021-01-06 16:40:13,533 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-01-06 16:40:13,535 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-01-06 16:40:13,535 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-01-06 16:40:13,536 INFO L138 SettingsManager]: * Use SBE=true [2021-01-06 16:40:13,536 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-01-06 16:40:13,536 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-01-06 16:40:13,536 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-01-06 16:40:13,537 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-01-06 16:40:13,537 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-01-06 16:40:13,537 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-01-06 16:40:13,537 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-01-06 16:40:13,538 INFO L138 SettingsManager]: * Use constant arrays=true [2021-01-06 16:40:13,538 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-01-06 16:40:13,538 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-01-06 16:40:13,539 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-01-06 16:40:13,539 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-01-06 16:40:13,539 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 16:40:13,539 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-01-06 16:40:13,540 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-01-06 16:40:13,540 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-01-06 16:40:13,540 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-01-06 16:40:13,540 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-01-06 16:40:13,541 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-01-06 16:40:13,541 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-01-06 16:40:13,541 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-01-06 16:40:13,933 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-01-06 16:40:13,967 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-01-06 16:40:13,970 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-01-06 16:40:13,972 INFO L271 PluginConnector]: Initializing CDTParser... [2021-01-06 16:40:13,973 INFO L275 PluginConnector]: CDTParser initialized [2021-01-06 16:40:13,974 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/loops/nec20.c [2021-01-06 16:40:14,079 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/c58a99ae2/0967f56b3e164df995d488128381ff0b/FLAGdf1212233 [2021-01-06 16:40:14,827 INFO L306 CDTParser]: Found 1 translation units. [2021-01-06 16:40:14,827 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/loops/nec20.c [2021-01-06 16:40:14,837 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/c58a99ae2/0967f56b3e164df995d488128381ff0b/FLAGdf1212233 [2021-01-06 16:40:15,213 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/c58a99ae2/0967f56b3e164df995d488128381ff0b [2021-01-06 16:40:15,218 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-01-06 16:40:15,224 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-01-06 16:40:15,229 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-01-06 16:40:15,229 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-01-06 16:40:15,234 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-01-06 16:40:15,235 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 04:40:15" (1/1) ... [2021-01-06 16:40:15,237 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7578846f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:15, skipping insertion in model container [2021-01-06 16:40:15,237 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 04:40:15" (1/1) ... [2021-01-06 16:40:15,249 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-01-06 16:40:15,272 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-01-06 16:40:15,511 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/loops/nec20.c[356,369] left hand side expression in assignment: lhs: VariableLHS[~n~0,] left hand side expression in assignment: lhs: VariableLHS[~n~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[BinaryExpression[ARITHMOD,IdentifierExpression[~i~0,],IntegerLiteral[4294967296]]]] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[BinaryExpression[ARITHMOD,IdentifierExpression[~j~0,],IntegerLiteral[4294967296]]]] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[IdentifierExpression[~b~0,GLOBAL]]] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[IdentifierExpression[~b~0,GLOBAL]]] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[IfThenElseExpression[BinaryExpression[LOGICAND,BinaryExpression[COMPLT,IdentifierExpression[~b~0,GLOBAL],IntegerLiteral[0]],BinaryExpression[COMPNEQ,IntegerLiteral[0],BinaryExpression[ARITHMOD,IdentifierExpression[~b~0,GLOBAL],IntegerLiteral[1023]]]],BinaryExpression[ARITHMINUS,BinaryExpression[ARITHMOD,IdentifierExpression[~b~0,GLOBAL],IntegerLiteral[1023]],IntegerLiteral[1023]],BinaryExpression[ARITHMOD,IdentifierExpression[~b~0,GLOBAL],IntegerLiteral[1023]]]]] [2021-01-06 16:40:15,549 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 16:40:15,558 INFO L203 MainTranslator]: Completed pre-run [2021-01-06 16:40:15,570 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/loops/nec20.c[356,369] left hand side expression in assignment: lhs: VariableLHS[~n~0,] left hand side expression in assignment: lhs: VariableLHS[~n~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: VariableLHS[~j~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[BinaryExpression[ARITHMOD,IdentifierExpression[~i~0,],IntegerLiteral[4294967296]]]] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[BinaryExpression[ARITHMOD,IdentifierExpression[~j~0,],IntegerLiteral[4294967296]]]] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[IdentifierExpression[~b~0,GLOBAL]]] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[IdentifierExpression[~b~0,GLOBAL]]] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[IfThenElseExpression[BinaryExpression[LOGICAND,BinaryExpression[COMPLT,IdentifierExpression[~b~0,GLOBAL],IntegerLiteral[0]],BinaryExpression[COMPNEQ,IntegerLiteral[0],BinaryExpression[ARITHMOD,IdentifierExpression[~b~0,GLOBAL],IntegerLiteral[1023]]]],BinaryExpression[ARITHMINUS,BinaryExpression[ARITHMOD,IdentifierExpression[~b~0,GLOBAL],IntegerLiteral[1023]],IntegerLiteral[1023]],BinaryExpression[ARITHMOD,IdentifierExpression[~b~0,GLOBAL],IntegerLiteral[1023]]]]] [2021-01-06 16:40:15,578 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 16:40:15,593 INFO L208 MainTranslator]: Completed translation [2021-01-06 16:40:15,594 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:15 WrapperNode [2021-01-06 16:40:15,594 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-01-06 16:40:15,596 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-01-06 16:40:15,596 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-01-06 16:40:15,596 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-01-06 16:40:15,606 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:15" (1/1) ... [2021-01-06 16:40:15,615 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:15" (1/1) ... [2021-01-06 16:40:15,639 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-01-06 16:40:15,640 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-01-06 16:40:15,640 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-01-06 16:40:15,640 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-01-06 16:40:15,651 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:15" (1/1) ... [2021-01-06 16:40:15,652 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:15" (1/1) ... [2021-01-06 16:40:15,653 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:15" (1/1) ... [2021-01-06 16:40:15,654 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:15" (1/1) ... [2021-01-06 16:40:15,658 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:15" (1/1) ... [2021-01-06 16:40:15,662 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:15" (1/1) ... [2021-01-06 16:40:15,664 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:15" (1/1) ... [2021-01-06 16:40:15,666 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-01-06 16:40:15,667 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-01-06 16:40:15,668 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-01-06 16:40:15,668 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-01-06 16:40:15,669 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:15" (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 [2021-01-06 16:40:15,786 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-01-06 16:40:15,787 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-01-06 16:40:15,787 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-01-06 16:40:15,787 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-01-06 16:40:16,086 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-01-06 16:40:16,086 INFO L299 CfgBuilder]: Removed 7 assume(true) statements. [2021-01-06 16:40:16,089 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 04:40:16 BoogieIcfgContainer [2021-01-06 16:40:16,089 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-01-06 16:40:16,092 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-01-06 16:40:16,092 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-01-06 16:40:16,097 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-01-06 16:40:16,097 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.01 04:40:15" (1/3) ... [2021-01-06 16:40:16,099 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d4f46bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 04:40:16, skipping insertion in model container [2021-01-06 16:40:16,099 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 04:40:15" (2/3) ... [2021-01-06 16:40:16,099 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d4f46bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 04:40:16, skipping insertion in model container [2021-01-06 16:40:16,100 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 04:40:16" (3/3) ... [2021-01-06 16:40:16,102 INFO L111 eAbstractionObserver]: Analyzing ICFG nec20.c [2021-01-06 16:40:16,111 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-01-06 16:40:16,117 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-01-06 16:40:16,142 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-01-06 16:40:16,184 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-01-06 16:40:16,185 INFO L378 AbstractCegarLoop]: Hoare is true [2021-01-06 16:40:16,188 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-01-06 16:40:16,188 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-01-06 16:40:16,188 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-01-06 16:40:16,189 INFO L382 AbstractCegarLoop]: Difference is false [2021-01-06 16:40:16,189 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-01-06 16:40:16,189 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-01-06 16:40:16,262 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states. [2021-01-06 16:40:16,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-01-06 16:40:16,278 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:40:16,279 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 16:40:16,283 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:40:16,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:40:16,313 INFO L82 PathProgramCache]: Analyzing trace with hash -592064849, now seen corresponding path program 1 times [2021-01-06 16:40:16,333 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:40:16,335 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [610258278] [2021-01-06 16:40:16,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:40:16,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:40:16,759 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:40:16,760 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [610258278] [2021-01-06 16:40:16,761 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 16:40:16,761 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-01-06 16:40:16,762 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [458849882] [2021-01-06 16:40:16,768 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-01-06 16:40:16,769 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:40:16,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-01-06 16:40:16,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-01-06 16:40:16,789 INFO L87 Difference]: Start difference. First operand 16 states. Second operand 4 states. [2021-01-06 16:40:16,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:40:16,853 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2021-01-06 16:40:16,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 16:40:16,856 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2021-01-06 16:40:16,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:40:16,867 INFO L225 Difference]: With dead ends: 43 [2021-01-06 16:40:16,867 INFO L226 Difference]: Without dead ends: 18 [2021-01-06 16:40:16,870 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-01-06 16:40:16,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-01-06 16:40:16,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 13. [2021-01-06 16:40:16,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2021-01-06 16:40:16,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-01-06 16:40:16,910 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2021-01-06 16:40:16,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:40:16,911 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-01-06 16:40:16,911 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2021-01-06 16:40:16,911 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-01-06 16:40:16,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-01-06 16:40:16,912 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:40:16,912 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 16:40:16,912 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-01-06 16:40:16,912 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:40:16,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:40:16,914 INFO L82 PathProgramCache]: Analyzing trace with hash 1182942513, now seen corresponding path program 1 times [2021-01-06 16:40:16,914 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:40:16,914 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249986375] [2021-01-06 16:40:16,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:40:16,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 16:40:17,052 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 16:40:17,052 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249986375] [2021-01-06 16:40:17,053 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 16:40:17,053 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-01-06 16:40:17,053 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844526766] [2021-01-06 16:40:17,055 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-01-06 16:40:17,055 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 16:40:17,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-01-06 16:40:17,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-01-06 16:40:17,057 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 4 states. [2021-01-06 16:40:17,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 16:40:17,103 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2021-01-06 16:40:17,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 16:40:17,104 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2021-01-06 16:40:17,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 16:40:17,105 INFO L225 Difference]: With dead ends: 23 [2021-01-06 16:40:17,105 INFO L226 Difference]: Without dead ends: 19 [2021-01-06 16:40:17,106 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-01-06 16:40:17,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-01-06 16:40:17,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 11. [2021-01-06 16:40:17,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2021-01-06 16:40:17,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2021-01-06 16:40:17,110 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 9 [2021-01-06 16:40:17,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 16:40:17,111 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2021-01-06 16:40:17,111 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2021-01-06 16:40:17,111 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2021-01-06 16:40:17,112 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-01-06 16:40:17,112 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 16:40:17,112 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 16:40:17,112 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-01-06 16:40:17,112 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 16:40:17,113 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 16:40:17,113 INFO L82 PathProgramCache]: Analyzing trace with hash -1172475752, now seen corresponding path program 1 times [2021-01-06 16:40:17,114 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 16:40:17,114 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [598851247] [2021-01-06 16:40:17,114 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 16:40:17,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-01-06 16:40:17,165 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-01-06 16:40:17,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-01-06 16:40:17,212 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-01-06 16:40:17,236 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-01-06 16:40:17,237 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-01-06 16:40:17,237 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-01-06 16:40:17,276 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.01 04:40:17 BoogieIcfgContainer [2021-01-06 16:40:17,276 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-01-06 16:40:17,277 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-01-06 16:40:17,277 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-01-06 16:40:17,277 INFO L275 PluginConnector]: Witness Printer initialized [2021-01-06 16:40:17,278 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 04:40:16" (3/4) ... [2021-01-06 16:40:17,281 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2021-01-06 16:40:17,333 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/loops/nec20.c-witness.graphml [2021-01-06 16:40:17,333 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-01-06 16:40:17,335 INFO L168 Benchmark]: Toolchain (without parser) took 2110.70 ms. Allocated memory is still 156.2 MB. Free memory was 132.1 MB in the beginning and 99.7 MB in the end (delta: 32.5 MB). Peak memory consumption was 32.4 MB. Max. memory is 8.0 GB. [2021-01-06 16:40:17,336 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 156.2 MB. Free memory is still 129.5 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-01-06 16:40:17,337 INFO L168 Benchmark]: CACSL2BoogieTranslator took 366.00 ms. Allocated memory is still 156.2 MB. Free memory was 131.9 MB in the beginning and 122.2 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-01-06 16:40:17,338 INFO L168 Benchmark]: Boogie Procedure Inliner took 43.24 ms. Allocated memory is still 156.2 MB. Free memory was 122.1 MB in the beginning and 120.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-01-06 16:40:17,338 INFO L168 Benchmark]: Boogie Preprocessor took 26.52 ms. Allocated memory is still 156.2 MB. Free memory was 120.6 MB in the beginning and 119.6 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-01-06 16:40:17,339 INFO L168 Benchmark]: RCFGBuilder took 421.83 ms. Allocated memory is still 156.2 MB. Free memory was 119.6 MB in the beginning and 107.0 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2021-01-06 16:40:17,340 INFO L168 Benchmark]: TraceAbstraction took 1184.56 ms. Allocated memory is still 156.2 MB. Free memory was 106.8 MB in the beginning and 102.3 MB in the end (delta: 4.5 MB). Peak memory consumption was 4.1 MB. Max. memory is 8.0 GB. [2021-01-06 16:40:17,340 INFO L168 Benchmark]: Witness Printer took 56.05 ms. Allocated memory is still 156.2 MB. Free memory was 102.3 MB in the beginning and 99.7 MB in the end (delta: 2.6 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. [2021-01-06 16:40:17,344 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 156.2 MB. Free memory is still 129.5 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 366.00 ms. Allocated memory is still 156.2 MB. Free memory was 131.9 MB in the beginning and 122.2 MB in the end (delta: 9.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 43.24 ms. Allocated memory is still 156.2 MB. Free memory was 122.1 MB in the beginning and 120.6 MB in the end (delta: 1.5 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 26.52 ms. Allocated memory is still 156.2 MB. Free memory was 120.6 MB in the beginning and 119.6 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 421.83 ms. Allocated memory is still 156.2 MB. Free memory was 119.6 MB in the beginning and 107.0 MB in the end (delta: 12.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1184.56 ms. Allocated memory is still 156.2 MB. Free memory was 106.8 MB in the beginning and 102.3 MB in the end (delta: 4.5 MB). Peak memory consumption was 4.1 MB. Max. memory is 8.0 GB. * Witness Printer took 56.05 ms. Allocated memory is still 156.2 MB. Free memory was 102.3 MB in the beginning and 99.7 MB in the end (delta: 2.6 MB). Peak memory consumption was 3.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 8]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L12] int b; VAL [b=0] [L15] _Bool k=__VERIFIER_nondet_bool(); [L16] unsigned int i,n,j; [L17] int a[1025]; VAL [b=0] [L19] COND TRUE \read(k) [L20] n=0 VAL [b=0] [L25] i=0 [L26] j=__VERIFIER_nondet_uint() [L27] COND FALSE !(j > 10000) VAL [b=0] [L30] COND TRUE i <= n [L31] i++ [L32] j= j +2 VAL [b=0] [L30] COND FALSE !(i <= n) VAL [b=0] [L35] a[i]=0 [L7] COND TRUE !(cond) VAL [b=0] [L8] reach_error() VAL [b=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 16 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.0s, OverallIterations: 3, TraceHistogramMax: 1, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 42 SDtfs, 27 SDslu, 35 SDs, 0 SdLazy, 26 SolverSat, 2 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=16occurred 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, 13 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 28 NumberOfCodeBlocks, 28 NumberOfCodeBlocksAsserted, 3 NumberOfCheckSat, 16 ConstructedInterpolants, 0 QuantifiedInterpolants, 528 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 2 InterpolantComputations, 2 PerfectInterpolantSequences, 0/0 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...