java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf --traceabstraction.trace.refinement.strategy SIFA_TAIPAN --sifa.abstract.domain CompoundDomain --rcfgbuilder.size.of.a.code.block LoopFreeBlock --sifa.call.summarizer TopInputCallSummarizer --sifa.fluid SizeLimitFluid --sifa.simplification.technique SIMPLIFY_QUICK -i ../../../trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-15 03:04:00,033 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-15 03:04:00,036 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-15 03:04:00,054 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-15 03:04:00,054 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-15 03:04:00,056 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-15 03:04:00,058 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-15 03:04:00,067 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-15 03:04:00,072 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-15 03:04:00,075 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-15 03:04:00,076 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-15 03:04:00,077 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-15 03:04:00,078 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-15 03:04:00,079 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-15 03:04:00,082 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-15 03:04:00,083 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-15 03:04:00,084 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-15 03:04:00,085 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-15 03:04:00,087 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-15 03:04:00,091 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-15 03:04:00,095 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-15 03:04:00,098 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-15 03:04:00,100 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-15 03:04:00,101 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-15 03:04:00,103 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-15 03:04:00,107 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-15 03:04:00,109 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-15 03:04:00,109 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-15 03:04:00,110 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-15 03:04:00,112 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-15 03:04:00,112 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-15 03:04:00,113 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-15 03:04:00,113 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-15 03:04:00,113 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-15 03:04:00,114 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-15 03:04:00,116 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-15 03:04:00,117 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-15 03:04:00,144 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-15 03:04:00,144 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-15 03:04:00,148 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-15 03:04:00,148 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-15 03:04:00,148 INFO L138 SettingsManager]: * Use SBE=true [2019-10-15 03:04:00,149 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-15 03:04:00,149 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-15 03:04:00,149 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-15 03:04:00,150 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-15 03:04:00,150 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-15 03:04:00,151 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-15 03:04:00,151 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-15 03:04:00,151 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-15 03:04:00,152 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-15 03:04:00,152 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-15 03:04:00,152 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-15 03:04:00,152 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-15 03:04:00,152 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-15 03:04:00,153 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-15 03:04:00,153 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-15 03:04:00,153 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-15 03:04:00,153 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 03:04:00,153 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-15 03:04:00,154 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-15 03:04:00,154 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-15 03:04:00,154 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-15 03:04:00,154 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-15 03:04:00,154 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-15 03:04:00,154 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> SIFA_TAIPAN Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Abstract Domain -> CompoundDomain Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder: Size of a code block -> LoopFreeBlock Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Call Summarizer -> TopInputCallSummarizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Fluid -> SizeLimitFluid Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.sifa: Simplification Technique -> SIMPLIFY_QUICK [2019-10-15 03:04:00,437 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-15 03:04:00,457 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-15 03:04:00,460 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-15 03:04:00,462 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-15 03:04:00,462 INFO L275 PluginConnector]: CDTParser initialized [2019-10-15 03:04:00,463 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i [2019-10-15 03:04:00,536 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/643942bfc/1dbbed9899244b059488c571f5413b5e/FLAG0b545b52e [2019-10-15 03:04:00,972 INFO L306 CDTParser]: Found 1 translation units. [2019-10-15 03:04:00,973 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/sum01_bug02_sum01_bug02_base.case.i [2019-10-15 03:04:00,980 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/643942bfc/1dbbed9899244b059488c571f5413b5e/FLAG0b545b52e [2019-10-15 03:04:01,375 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/643942bfc/1dbbed9899244b059488c571f5413b5e [2019-10-15 03:04:01,385 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-15 03:04:01,387 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-15 03:04:01,392 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-15 03:04:01,392 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-15 03:04:01,396 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-15 03:04:01,397 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:04:01" (1/1) ... [2019-10-15 03:04:01,400 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4a8f9260 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:01, skipping insertion in model container [2019-10-15 03:04:01,400 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 15.10 03:04:01" (1/1) ... [2019-10-15 03:04:01,409 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-15 03:04:01,428 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-15 03:04:01,648 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 03:04:01,652 INFO L188 MainTranslator]: Completed pre-run [2019-10-15 03:04:01,672 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-15 03:04:01,689 INFO L192 MainTranslator]: Completed translation [2019-10-15 03:04:01,689 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:01 WrapperNode [2019-10-15 03:04:01,690 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-15 03:04:01,691 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-15 03:04:01,691 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-15 03:04:01,691 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-15 03:04:01,801 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:01" (1/1) ... [2019-10-15 03:04:01,801 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:01" (1/1) ... [2019-10-15 03:04:01,814 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:01" (1/1) ... [2019-10-15 03:04:01,816 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:01" (1/1) ... [2019-10-15 03:04:01,821 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:01" (1/1) ... [2019-10-15 03:04:01,826 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:01" (1/1) ... [2019-10-15 03:04:01,827 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:01" (1/1) ... [2019-10-15 03:04:01,833 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-15 03:04:01,833 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-15 03:04:01,833 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-15 03:04:01,834 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-15 03:04:01,835 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:01" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-15 03:04:01,899 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-15 03:04:01,899 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-15 03:04:01,899 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-15 03:04:01,899 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-15 03:04:01,899 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-15 03:04:01,900 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-15 03:04:01,900 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2019-10-15 03:04:01,900 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-15 03:04:01,901 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-15 03:04:01,901 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-15 03:04:02,124 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-15 03:04:02,124 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-10-15 03:04:02,126 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:04:02 BoogieIcfgContainer [2019-10-15 03:04:02,127 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-15 03:04:02,128 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-15 03:04:02,128 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-15 03:04:02,132 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-15 03:04:02,133 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 15.10 03:04:01" (1/3) ... [2019-10-15 03:04:02,134 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@194ff5ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:04:02, skipping insertion in model container [2019-10-15 03:04:02,134 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 15.10 03:04:01" (2/3) ... [2019-10-15 03:04:02,134 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@194ff5ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 15.10 03:04:02, skipping insertion in model container [2019-10-15 03:04:02,135 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 15.10 03:04:02" (3/3) ... [2019-10-15 03:04:02,137 INFO L109 eAbstractionObserver]: Analyzing ICFG sum01_bug02_sum01_bug02_base.case.i [2019-10-15 03:04:02,151 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-15 03:04:02,168 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-15 03:04:02,183 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-15 03:04:02,228 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-15 03:04:02,228 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-15 03:04:02,229 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-15 03:04:02,229 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-15 03:04:02,231 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-15 03:04:02,232 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-15 03:04:02,232 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-15 03:04:02,232 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-15 03:04:02,279 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2019-10-15 03:04:02,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-10-15 03:04:02,286 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:02,287 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:02,291 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:02,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:02,301 INFO L82 PathProgramCache]: Analyzing trace with hash -699336870, now seen corresponding path program 1 times [2019-10-15 03:04:02,313 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:02,314 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1785544895] [2019-10-15 03:04:02,315 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:02,315 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:02,315 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:02,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:02,531 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 03:04:02,532 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1785544895] [2019-10-15 03:04:02,533 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-15 03:04:02,533 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-10-15 03:04:02,534 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016363739] [2019-10-15 03:04:02,538 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-10-15 03:04:02,538 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:02,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-10-15 03:04:02,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-10-15 03:04:02,551 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 5 states. [2019-10-15 03:04:02,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:02,664 INFO L93 Difference]: Finished difference Result 33 states and 36 transitions. [2019-10-15 03:04:02,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-15 03:04:02,666 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2019-10-15 03:04:02,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:02,678 INFO L225 Difference]: With dead ends: 33 [2019-10-15 03:04:02,678 INFO L226 Difference]: Without dead ends: 12 [2019-10-15 03:04:02,685 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-10-15 03:04:02,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2019-10-15 03:04:02,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2019-10-15 03:04:02,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2019-10-15 03:04:02,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2019-10-15 03:04:02,729 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2019-10-15 03:04:02,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:02,730 INFO L462 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2019-10-15 03:04:02,730 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-10-15 03:04:02,731 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2019-10-15 03:04:02,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-10-15 03:04:02,732 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:02,732 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:02,733 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:02,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:02,734 INFO L82 PathProgramCache]: Analyzing trace with hash -228174086, now seen corresponding path program 1 times [2019-10-15 03:04:02,734 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:02,734 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1718470301] [2019-10-15 03:04:02,735 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:02,735 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:02,735 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:02,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:02,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 03:04:02,950 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1718470301] [2019-10-15 03:04:02,951 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [985761182] [2019-10-15 03:04:02,951 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/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 [2019-10-15 03:04:02,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-15 03:04:02,992 INFO L256 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-15 03:04:02,998 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-15 03:04:03,215 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-15 03:04:03,340 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 03:04:03,341 INFO L321 TraceCheckSpWp]: Computing backward predicates... [2019-10-15 03:04:03,595 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-15 03:04:03,596 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1199575049] [2019-10-15 03:04:03,651 INFO L162 IcfgInterpreter]: Started Sifa with 11 locations of interest [2019-10-15 03:04:03,652 INFO L169 IcfgInterpreter]: Building call graph [2019-10-15 03:04:03,658 INFO L174 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2019-10-15 03:04:03,666 INFO L179 IcfgInterpreter]: Starting interpretation [2019-10-15 03:04:03,667 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2019-10-15 03:04:03,724 INFO L199 IcfgInterpreter]: Interpreting procedure main with input of size 1 for LOIs [2019-10-15 03:04:03,858 INFO L199 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2019-10-15 03:04:03,987 INFO L199 IcfgInterpreter]: Interpreting procedure ULTIMATE.init with input of size 1 for LOIs [2019-10-15 03:04:03,992 INFO L183 IcfgInterpreter]: Interpretation finished [2019-10-15 03:04:04,147 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 4 imperfect interpolant sequences. [2019-10-15 03:04:04,147 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 5] total 19 [2019-10-15 03:04:04,148 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1788433943] [2019-10-15 03:04:04,150 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-15 03:04:04,150 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2019-10-15 03:04:04,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-15 03:04:04,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=285, Unknown=0, NotChecked=0, Total=342 [2019-10-15 03:04:04,152 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 19 states. [2019-10-15 03:04:04,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-15 03:04:04,574 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2019-10-15 03:04:04,574 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-15 03:04:04,575 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 11 [2019-10-15 03:04:04,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-15 03:04:04,576 INFO L225 Difference]: With dead ends: 22 [2019-10-15 03:04:04,576 INFO L226 Difference]: Without dead ends: 15 [2019-10-15 03:04:04,579 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=106, Invalid=494, Unknown=0, NotChecked=0, Total=600 [2019-10-15 03:04:04,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2019-10-15 03:04:04,590 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2019-10-15 03:04:04,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2019-10-15 03:04:04,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2019-10-15 03:04:04,593 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2019-10-15 03:04:04,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-15 03:04:04,594 INFO L462 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2019-10-15 03:04:04,594 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-15 03:04:04,597 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2019-10-15 03:04:04,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-15 03:04:04,599 INFO L372 BasicCegarLoop]: Found error trace [2019-10-15 03:04:04,600 INFO L380 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-15 03:04:04,807 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-15 03:04:04,808 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-15 03:04:04,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-15 03:04:04,810 INFO L82 PathProgramCache]: Analyzing trace with hash -528752806, now seen corresponding path program 2 times [2019-10-15 03:04:04,810 INFO L157 tionRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2019-10-15 03:04:04,811 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1837035508] [2019-10-15 03:04:04,812 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:04,812 INFO L116 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-10-15 03:04:04,813 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-15 03:04:04,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-15 03:04:04,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2019-10-15 03:04:04,949 INFO L168 tionRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2019-10-15 03:04:04,949 INFO L445 BasicCegarLoop]: Counterexample might be feasible [2019-10-15 03:04:04,981 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 15.10 03:04:04 BoogieIcfgContainer [2019-10-15 03:04:04,982 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2019-10-15 03:04:04,985 INFO L168 Benchmark]: Toolchain (without parser) took 3596.81 ms. Allocated memory was 137.9 MB in the beginning and 234.4 MB in the end (delta: 96.5 MB). Free memory was 102.6 MB in the beginning and 140.6 MB in the end (delta: -37.9 MB). Peak memory consumption was 58.6 MB. Max. memory is 7.1 GB. [2019-10-15 03:04:04,986 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 137.9 MB. Free memory was 121.2 MB in the beginning and 120.9 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. [2019-10-15 03:04:04,987 INFO L168 Benchmark]: CACSL2BoogieTranslator took 298.68 ms. Allocated memory is still 137.9 MB. Free memory was 102.2 MB in the beginning and 93.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2019-10-15 03:04:04,988 INFO L168 Benchmark]: Boogie Preprocessor took 141.99 ms. Allocated memory was 137.9 MB in the beginning and 202.9 MB in the end (delta: 65.0 MB). Free memory was 93.1 MB in the beginning and 181.2 MB in the end (delta: -88.1 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. [2019-10-15 03:04:04,989 INFO L168 Benchmark]: RCFGBuilder took 293.34 ms. Allocated memory is still 202.9 MB. Free memory was 181.2 MB in the beginning and 168.2 MB in the end (delta: 13.0 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. [2019-10-15 03:04:04,990 INFO L168 Benchmark]: TraceAbstraction took 2853.93 ms. Allocated memory was 202.9 MB in the beginning and 234.4 MB in the end (delta: 31.5 MB). Free memory was 168.2 MB in the beginning and 140.6 MB in the end (delta: 27.6 MB). Peak memory consumption was 59.1 MB. Max. memory is 7.1 GB. [2019-10-15 03:04:04,994 INFO L335 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 137.9 MB. Free memory was 121.2 MB in the beginning and 120.9 MB in the end (delta: 209.7 kB). Peak memory consumption was 209.7 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 298.68 ms. Allocated memory is still 137.9 MB. Free memory was 102.2 MB in the beginning and 93.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 141.99 ms. Allocated memory was 137.9 MB in the beginning and 202.9 MB in the end (delta: 65.0 MB). Free memory was 93.1 MB in the beginning and 181.2 MB in the end (delta: -88.1 MB). Peak memory consumption was 14.1 MB. Max. memory is 7.1 GB. * RCFGBuilder took 293.34 ms. Allocated memory is still 202.9 MB. Free memory was 181.2 MB in the beginning and 168.2 MB in the end (delta: 13.0 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 2853.93 ms. Allocated memory was 202.9 MB in the beginning and 234.4 MB in the end (delta: 31.5 MB). Free memory was 168.2 MB in the beginning and 140.6 MB in the end (delta: 27.6 MB). Peak memory consumption was 59.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 5]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int i, n=__VERIFIER_nondet_uint(), sn=0; [L12] int i, n=__VERIFIER_nondet_uint(), sn=0; [L13] i=1 VAL [i=1, n=4, n=0] [L13] COND TRUE i<=n [L14] sn = sn + (2) [L15] COND FALSE !(i==4) [L13] i++ VAL [i=2, n=4, n=2] [L13] COND TRUE i<=n [L14] sn = sn + (2) [L15] COND FALSE !(i==4) [L13] i++ VAL [i=3, n=4, n=4] [L13] COND TRUE i<=n [L14] sn = sn + (2) [L15] COND FALSE !(i==4) [L13] i++ VAL [i=4, n=6, n=4] [L13] COND TRUE i<=n [L14] sn = sn + (2) [L15] COND TRUE i==4 [L15] sn=-10 [L13] i++ VAL [i=5, n=4, n=-10] [L13] COND FALSE !(i<=n) VAL [i=5, n=-10, n=4] [L17] CALL __VERIFIER_assert(sn==n*(2) || sn == 0) VAL [\old(cond)=0] [L4] COND TRUE !(cond) VAL [\old(cond)=0, cond=0] [L5] __VERIFIER_error() VAL [\old(cond)=0, cond=0] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 17 locations, 1 error locations. Result: UNSAFE, OverallTime: 2.7s, OverallIterations: 3, TraceHistogramMax: 4, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, HoareTripleCheckerStatistics: 21 SDtfs, 20 SDslu, 99 SDs, 0 SdLazy, 79 SolverSat, 7 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 51 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 1.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=17occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 2 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 46 NumberOfCodeBlocks, 46 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 39 ConstructedInterpolants, 0 QuantifiedInterpolants, 1851 SizeOfPredicates, 4 NumberOfNonLiveVariables, 30 ConjunctsInSsa, 14 ConjunctsInUnsatCore, 4 InterpolantComputations, 1 PerfectInterpolantSequences, 0/3 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, SIFA: OVERALL_TIME[ms]: 344, ICFG_INTERPRETER_ENTERED_PROCEDURES: 4, DAG_INTERPRETER_EARLY_EXIT_QUERIES: 21, DAG_INTERPRETER_EARLY_EXITS: 0, TOOLS_POST_APPLICATIONS: 10, TOOLS_POST_TIME[ms]: 59, TOOLS_POST_CALL_APPLICATIONS: 5, TOOLS_POST_CALL_TIME[ms]: 7, TOOLS_POST_RETURN_APPLICATIONS: 2, TOOLS_POST_RETURN_TIME[ms]: 0, TOOLS_QUANTIFIERELIM_APPLICATIONS: 17, TOOLS_QUANTIFIERELIM_TIME[ms]: 57, TOOLS_QUANTIFIERELIM_MAX_TIME[ms]: 24, FLUID_QUERY_TIME[ms]: 4, FLUID_QUERIES: 24, FLUID_YES_ANSWERS: 1, DOMAIN_JOIN_APPLICATIONS: 18, DOMAIN_JOIN_TIME[ms]: 186, DOMAIN_ALPHA_APPLICATIONS: 1, DOMAIN_ALPHA_TIME[ms]: 3, DOMAIN_WIDEN_APPLICATIONS: 2, DOMAIN_WIDEN_TIME[ms]: 9, DOMAIN_ISSUBSETEQ_APPLICATIONS: 3, DOMAIN_ISSUBSETEQ_TIME[ms]: 8, DOMAIN_ISBOTTOM_APPLICATIONS: 1, DOMAIN_ISBOTTOM_TIME[ms]: 2, LOOP_SUMMARIZER_APPLICATIONS: 1, LOOP_SUMMARIZER_CACHE_MISSES: 1, LOOP_SUMMARIZER_OVERALL_TIME[ms]: 100, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME[ms]: 100, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 3, CALL_SUMMARIZER_APPLICATIONS: 2, CALL_SUMMARIZER_CACHE_MISSES: 1, CALL_SUMMARIZER_OVERALL_TIME[ms]: 6, CALL_SUMMARIZER_NEW_COMPUTATION_TIME[ms]: 6, PROCEDURE_GRAPH_BUILDER_TIME[ms]: 8, PATH_EXPR_TIME[ms]: 3, REGEX_TO_DAG_TIME[ms]: 3, DAG_COMPRESSION_TIME[ms]: 12, DAG_COMPRESSION_PROCESSED_NODES: 57, DAG_COMPRESSION_RETAINED_NODES: 42, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...